17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5d8aa0f5aSsudheer * Common Development and Distribution License (the "License"). 6d8aa0f5aSsudheer * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 2197eda132Sraf 227c478bd9Sstevel@tonic-gate /* 23ae115bc7Smrj * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277c478bd9Sstevel@tonic-gate /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ 287c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */ 297c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 307c478bd9Sstevel@tonic-gate /* */ 317c478bd9Sstevel@tonic-gate /* Copyright (c) 1987, 1988 Microsoft Corporation */ 327c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 337c478bd9Sstevel@tonic-gate /* */ 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate #include <sys/types.h> 387c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 397c478bd9Sstevel@tonic-gate #include <sys/param.h> 407c478bd9Sstevel@tonic-gate #include <sys/signal.h> 417c478bd9Sstevel@tonic-gate #include <sys/systm.h> 427c478bd9Sstevel@tonic-gate #include <sys/user.h> 437c478bd9Sstevel@tonic-gate #include <sys/proc.h> 447c478bd9Sstevel@tonic-gate #include <sys/disp.h> 457c478bd9Sstevel@tonic-gate #include <sys/class.h> 467c478bd9Sstevel@tonic-gate #include <sys/core.h> 477c478bd9Sstevel@tonic-gate #include <sys/syscall.h> 487c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 497c478bd9Sstevel@tonic-gate #include <sys/vm.h> 507c478bd9Sstevel@tonic-gate #include <sys/sysinfo.h> 517c478bd9Sstevel@tonic-gate #include <sys/fault.h> 527c478bd9Sstevel@tonic-gate #include <sys/stack.h> 537c478bd9Sstevel@tonic-gate #include <sys/psw.h> 547c478bd9Sstevel@tonic-gate #include <sys/regset.h> 557c478bd9Sstevel@tonic-gate #include <sys/fp.h> 567c478bd9Sstevel@tonic-gate #include <sys/trap.h> 577c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 587c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 597c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h> 607c478bd9Sstevel@tonic-gate #include <sys/prsystm.h> 617c478bd9Sstevel@tonic-gate #include <sys/mutex_impl.h> 627c478bd9Sstevel@tonic-gate #include <sys/machsystm.h> 637c478bd9Sstevel@tonic-gate #include <sys/archsystm.h> 647c478bd9Sstevel@tonic-gate #include <sys/sdt.h> 657c478bd9Sstevel@tonic-gate #include <sys/avintr.h> 667c478bd9Sstevel@tonic-gate #include <sys/kobj.h> 677c478bd9Sstevel@tonic-gate 687c478bd9Sstevel@tonic-gate #include <vm/hat.h> 697c478bd9Sstevel@tonic-gate 707c478bd9Sstevel@tonic-gate #include <vm/seg_kmem.h> 717c478bd9Sstevel@tonic-gate #include <vm/as.h> 727c478bd9Sstevel@tonic-gate #include <vm/seg.h> 737c478bd9Sstevel@tonic-gate #include <vm/hat_pte.h> 74ae115bc7Smrj #include <vm/hat_i86.h> 757c478bd9Sstevel@tonic-gate 767c478bd9Sstevel@tonic-gate #include <sys/procfs.h> 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate #include <sys/reboot.h> 797c478bd9Sstevel@tonic-gate #include <sys/debug.h> 807c478bd9Sstevel@tonic-gate #include <sys/debugreg.h> 817c478bd9Sstevel@tonic-gate #include <sys/modctl.h> 827c478bd9Sstevel@tonic-gate #include <sys/aio_impl.h> 837c478bd9Sstevel@tonic-gate #include <sys/tnf.h> 847c478bd9Sstevel@tonic-gate #include <sys/tnf_probe.h> 857c478bd9Sstevel@tonic-gate #include <sys/cred.h> 867c478bd9Sstevel@tonic-gate #include <sys/mman.h> 877c478bd9Sstevel@tonic-gate #include <sys/x86_archext.h> 887c478bd9Sstevel@tonic-gate #include <sys/copyops.h> 897c478bd9Sstevel@tonic-gate #include <c2/audit.h> 907c478bd9Sstevel@tonic-gate #include <sys/ftrace.h> 917c478bd9Sstevel@tonic-gate #include <sys/panic.h> 927c478bd9Sstevel@tonic-gate #include <sys/traptrace.h> 937c478bd9Sstevel@tonic-gate #include <sys/ontrap.h> 947c478bd9Sstevel@tonic-gate #include <sys/cpc_impl.h> 95ae115bc7Smrj #include <sys/bootconf.h> 96ae115bc7Smrj #include <sys/bootinfo.h> 97ae115bc7Smrj #include <sys/promif.h> 98ae115bc7Smrj #include <sys/mach_mmu.h> 997c478bd9Sstevel@tonic-gate 1007c478bd9Sstevel@tonic-gate #define USER 0x10000 /* user-mode flag added to trap type */ 1017c478bd9Sstevel@tonic-gate 1027c478bd9Sstevel@tonic-gate static const char *trap_type_mnemonic[] = { 1037c478bd9Sstevel@tonic-gate "de", "db", "2", "bp", 1047c478bd9Sstevel@tonic-gate "of", "br", "ud", "nm", 1057c478bd9Sstevel@tonic-gate "df", "9", "ts", "np", 1067c478bd9Sstevel@tonic-gate "ss", "gp", "pf", "15", 1077c478bd9Sstevel@tonic-gate "mf", "ac", "mc", "xf" 1087c478bd9Sstevel@tonic-gate }; 1097c478bd9Sstevel@tonic-gate 1107c478bd9Sstevel@tonic-gate static const char *trap_type[] = { 1117c478bd9Sstevel@tonic-gate "Divide error", /* trap id 0 */ 1127c478bd9Sstevel@tonic-gate "Debug", /* trap id 1 */ 1137c478bd9Sstevel@tonic-gate "NMI interrupt", /* trap id 2 */ 1147c478bd9Sstevel@tonic-gate "Breakpoint", /* trap id 3 */ 1157c478bd9Sstevel@tonic-gate "Overflow", /* trap id 4 */ 1167c478bd9Sstevel@tonic-gate "BOUND range exceeded", /* trap id 5 */ 1177c478bd9Sstevel@tonic-gate "Invalid opcode", /* trap id 6 */ 1187c478bd9Sstevel@tonic-gate "Device not available", /* trap id 7 */ 1197c478bd9Sstevel@tonic-gate "Double fault", /* trap id 8 */ 1207c478bd9Sstevel@tonic-gate "Coprocessor segment overrun", /* trap id 9 */ 1217c478bd9Sstevel@tonic-gate "Invalid TSS", /* trap id 10 */ 1227c478bd9Sstevel@tonic-gate "Segment not present", /* trap id 11 */ 1237c478bd9Sstevel@tonic-gate "Stack segment fault", /* trap id 12 */ 1247c478bd9Sstevel@tonic-gate "General protection", /* trap id 13 */ 1257c478bd9Sstevel@tonic-gate "Page fault", /* trap id 14 */ 1267c478bd9Sstevel@tonic-gate "Reserved", /* trap id 15 */ 1277c478bd9Sstevel@tonic-gate "x87 floating point error", /* trap id 16 */ 1287c478bd9Sstevel@tonic-gate "Alignment check", /* trap id 17 */ 1297c478bd9Sstevel@tonic-gate "Machine check", /* trap id 18 */ 1307c478bd9Sstevel@tonic-gate "SIMD floating point exception", /* trap id 19 */ 1317c478bd9Sstevel@tonic-gate }; 1327c478bd9Sstevel@tonic-gate 1337c478bd9Sstevel@tonic-gate #define TRAP_TYPES (sizeof (trap_type) / sizeof (trap_type[0])) 1347c478bd9Sstevel@tonic-gate 135*ddece0baSsethg #define SLOW_SCALL_SIZE 2 136*ddece0baSsethg #define FAST_SCALL_SIZE 2 137*ddece0baSsethg 1387c478bd9Sstevel@tonic-gate int tudebug = 0; 1397c478bd9Sstevel@tonic-gate int tudebugbpt = 0; 1407c478bd9Sstevel@tonic-gate int tudebugfpe = 0; 1417c478bd9Sstevel@tonic-gate int tudebugsse = 0; 1427c478bd9Sstevel@tonic-gate 1437c478bd9Sstevel@tonic-gate #if defined(TRAPDEBUG) || defined(lint) 1447c478bd9Sstevel@tonic-gate int tdebug = 0; 1457c478bd9Sstevel@tonic-gate int lodebug = 0; 1467c478bd9Sstevel@tonic-gate int faultdebug = 0; 1477c478bd9Sstevel@tonic-gate #else 1487c478bd9Sstevel@tonic-gate #define tdebug 0 1497c478bd9Sstevel@tonic-gate #define lodebug 0 1507c478bd9Sstevel@tonic-gate #define faultdebug 0 1517c478bd9Sstevel@tonic-gate #endif /* defined(TRAPDEBUG) || defined(lint) */ 1527c478bd9Sstevel@tonic-gate 1537c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 1547c478bd9Sstevel@tonic-gate static void dump_ttrace(void); 1557c478bd9Sstevel@tonic-gate #endif /* TRAPTRACE */ 1567c478bd9Sstevel@tonic-gate static void dumpregs(struct regs *); 1577c478bd9Sstevel@tonic-gate static void showregs(uint_t, struct regs *, caddr_t); 1587c478bd9Sstevel@tonic-gate static void dump_tss(void); 1597c478bd9Sstevel@tonic-gate static int kern_gpfault(struct regs *); 1607c478bd9Sstevel@tonic-gate 1617c478bd9Sstevel@tonic-gate struct trap_info { 1627c478bd9Sstevel@tonic-gate struct regs *trap_regs; 1637c478bd9Sstevel@tonic-gate uint_t trap_type; 1647c478bd9Sstevel@tonic-gate caddr_t trap_addr; 1657c478bd9Sstevel@tonic-gate }; 1667c478bd9Sstevel@tonic-gate 1677c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 1687c478bd9Sstevel@tonic-gate static int 1697c478bd9Sstevel@tonic-gate die(uint_t type, struct regs *rp, caddr_t addr, processorid_t cpuid) 1707c478bd9Sstevel@tonic-gate { 1717c478bd9Sstevel@tonic-gate struct trap_info ti; 1727c478bd9Sstevel@tonic-gate const char *trap_name, *trap_mnemonic; 1737c478bd9Sstevel@tonic-gate 1747c478bd9Sstevel@tonic-gate if (type < TRAP_TYPES) { 1757c478bd9Sstevel@tonic-gate trap_name = trap_type[type]; 1767c478bd9Sstevel@tonic-gate trap_mnemonic = trap_type_mnemonic[type]; 1777c478bd9Sstevel@tonic-gate } else { 1787c478bd9Sstevel@tonic-gate trap_name = "trap"; 1797c478bd9Sstevel@tonic-gate trap_mnemonic = "-"; 1807c478bd9Sstevel@tonic-gate } 1817c478bd9Sstevel@tonic-gate 1827c478bd9Sstevel@tonic-gate #ifdef TRAPTRACE 1837c478bd9Sstevel@tonic-gate TRAPTRACE_FREEZE; 1847c478bd9Sstevel@tonic-gate #endif 1857c478bd9Sstevel@tonic-gate 1867c478bd9Sstevel@tonic-gate ti.trap_regs = rp; 1877c478bd9Sstevel@tonic-gate ti.trap_type = type & ~USER; 1887c478bd9Sstevel@tonic-gate ti.trap_addr = addr; 1897c478bd9Sstevel@tonic-gate 1907c478bd9Sstevel@tonic-gate curthread->t_panic_trap = &ti; 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate if (type == T_PGFLT && addr < (caddr_t)KERNELBASE) { 1937c478bd9Sstevel@tonic-gate panic("BAD TRAP: type=%x (#%s %s) rp=%p addr=%p " 1947c478bd9Sstevel@tonic-gate "occurred in module \"%s\" due to %s", 1957c478bd9Sstevel@tonic-gate type, trap_mnemonic, trap_name, (void *)rp, (void *)addr, 1967c478bd9Sstevel@tonic-gate mod_containing_pc((caddr_t)rp->r_pc), 1977c478bd9Sstevel@tonic-gate addr < (caddr_t)PAGESIZE ? 1987c478bd9Sstevel@tonic-gate "a NULL pointer dereference" : 1997c478bd9Sstevel@tonic-gate "an illegal access to a user address"); 2007c478bd9Sstevel@tonic-gate } else 2017c478bd9Sstevel@tonic-gate panic("BAD TRAP: type=%x (#%s %s) rp=%p addr=%p", 2027c478bd9Sstevel@tonic-gate type, trap_mnemonic, trap_name, (void *)rp, (void *)addr); 2037c478bd9Sstevel@tonic-gate return (0); 2047c478bd9Sstevel@tonic-gate } 2057c478bd9Sstevel@tonic-gate 2067c478bd9Sstevel@tonic-gate /* 2077c478bd9Sstevel@tonic-gate * Rewrite the instruction at pc to be an int $T_SYSCALLINT instruction. 2087c478bd9Sstevel@tonic-gate * 2097c478bd9Sstevel@tonic-gate * int <vector> is two bytes: 0xCD <vector> 2107c478bd9Sstevel@tonic-gate */ 2117c478bd9Sstevel@tonic-gate 2127c478bd9Sstevel@tonic-gate static int 2137c478bd9Sstevel@tonic-gate rewrite_syscall(caddr_t pc) 2147c478bd9Sstevel@tonic-gate { 2157c478bd9Sstevel@tonic-gate uchar_t instr[SLOW_SCALL_SIZE] = { 0xCD, T_SYSCALLINT }; 2167c478bd9Sstevel@tonic-gate 2177c478bd9Sstevel@tonic-gate if (uwrite(curthread->t_procp, instr, SLOW_SCALL_SIZE, 2187c478bd9Sstevel@tonic-gate (uintptr_t)pc) != 0) 2197c478bd9Sstevel@tonic-gate return (1); 2207c478bd9Sstevel@tonic-gate 2217c478bd9Sstevel@tonic-gate return (0); 2227c478bd9Sstevel@tonic-gate } 2237c478bd9Sstevel@tonic-gate 2247c478bd9Sstevel@tonic-gate /* 2257c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is sysenter or syscall. The second 2267c478bd9Sstevel@tonic-gate * argument should be the x86 feature flag corresponding to the expected 2277c478bd9Sstevel@tonic-gate * instruction. 2287c478bd9Sstevel@tonic-gate * 2297c478bd9Sstevel@tonic-gate * sysenter is two bytes: 0x0F 0x34 2307c478bd9Sstevel@tonic-gate * syscall is two bytes: 0x0F 0x05 231*ddece0baSsethg * int $T_SYSCALLINT is two bytes: 0xCD 0x91 2327c478bd9Sstevel@tonic-gate */ 2337c478bd9Sstevel@tonic-gate 2347c478bd9Sstevel@tonic-gate static int 235*ddece0baSsethg instr_is_other_syscall(caddr_t pc, int which) 2367c478bd9Sstevel@tonic-gate { 2377c478bd9Sstevel@tonic-gate uchar_t instr[FAST_SCALL_SIZE]; 2387c478bd9Sstevel@tonic-gate 239*ddece0baSsethg ASSERT(which == X86_SEP || which == X86_ASYSC || which == 0xCD); 2407c478bd9Sstevel@tonic-gate 241*ddece0baSsethg if (copyin_nowatch(pc, (caddr_t)instr, FAST_SCALL_SIZE) != 0) 2427c478bd9Sstevel@tonic-gate return (0); 2437c478bd9Sstevel@tonic-gate 244*ddece0baSsethg switch (which) { 245*ddece0baSsethg case X86_SEP: 246*ddece0baSsethg if (instr[0] == 0x0F && instr[1] == 0x34) 247*ddece0baSsethg return (1); 248*ddece0baSsethg break; 249*ddece0baSsethg case X86_ASYSC: 250*ddece0baSsethg if (instr[0] == 0x0F && instr[1] == 0x05) 251*ddece0baSsethg return (1); 252*ddece0baSsethg break; 253*ddece0baSsethg case 0xCD: 254*ddece0baSsethg if (instr[0] == 0xCD && instr[1] == T_SYSCALLINT) 255*ddece0baSsethg return (1); 256*ddece0baSsethg break; 257*ddece0baSsethg } 2587c478bd9Sstevel@tonic-gate 2597c478bd9Sstevel@tonic-gate return (0); 2607c478bd9Sstevel@tonic-gate } 2617c478bd9Sstevel@tonic-gate 262*ddece0baSsethg static const char * 263*ddece0baSsethg syscall_insn_string(int syscall_insn) 264*ddece0baSsethg { 265*ddece0baSsethg switch (syscall_insn) { 266*ddece0baSsethg case X86_SEP: 267*ddece0baSsethg return ("sysenter"); 268*ddece0baSsethg case X86_ASYSC: 269*ddece0baSsethg return ("syscall"); 270*ddece0baSsethg case 0xCD: 271*ddece0baSsethg return ("int"); 272*ddece0baSsethg default: 273*ddece0baSsethg return ("Unknown"); 274*ddece0baSsethg } 275*ddece0baSsethg } 276*ddece0baSsethg 277*ddece0baSsethg static int 278*ddece0baSsethg ldt_rewrite_syscall(struct regs *rp, proc_t *p, int syscall_insn) 279*ddece0baSsethg { 280*ddece0baSsethg caddr_t linearpc; 281*ddece0baSsethg int return_code = 0; 282*ddece0baSsethg 283*ddece0baSsethg mutex_enter(&p->p_ldtlock); /* Must be held across linear_pc() */ 284*ddece0baSsethg 285*ddece0baSsethg if (linear_pc(rp, p, &linearpc) == 0) { 286*ddece0baSsethg 287*ddece0baSsethg /* 288*ddece0baSsethg * If another thread beat us here, it already changed 289*ddece0baSsethg * this site to the slower (int) syscall instruction. 290*ddece0baSsethg */ 291*ddece0baSsethg if (instr_is_other_syscall(linearpc, 0xCD)) { 292*ddece0baSsethg return_code = 1; 293*ddece0baSsethg } else if (instr_is_other_syscall(linearpc, syscall_insn)) { 294*ddece0baSsethg 295*ddece0baSsethg if (rewrite_syscall(linearpc) == 0) { 296*ddece0baSsethg return_code = 1; 297*ddece0baSsethg } 298*ddece0baSsethg #ifdef DEBUG 299*ddece0baSsethg else 300*ddece0baSsethg cmn_err(CE_WARN, "failed to rewrite %s " 301*ddece0baSsethg "instruction in process %d", 302*ddece0baSsethg syscall_insn_string(syscall_insn), 303*ddece0baSsethg p->p_pid); 304*ddece0baSsethg #endif /* DEBUG */ 305*ddece0baSsethg } 306*ddece0baSsethg } 307*ddece0baSsethg 308*ddece0baSsethg mutex_exit(&p->p_ldtlock); /* Must be held across linear_pc() */ 309*ddece0baSsethg 310*ddece0baSsethg return (return_code); 311*ddece0baSsethg } 312*ddece0baSsethg 3137c478bd9Sstevel@tonic-gate /* 3147c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is a system call instruction. 3157c478bd9Sstevel@tonic-gate * 3167c478bd9Sstevel@tonic-gate * The bytes of an lcall instruction used for the syscall trap. 3177c478bd9Sstevel@tonic-gate * static uchar_t lcall[7] = { 0x9a, 0, 0, 0, 0, 0x7, 0 }; 3187c478bd9Sstevel@tonic-gate * static uchar_t lcallalt[7] = { 0x9a, 0, 0, 0, 0, 0x27, 0 }; 3197c478bd9Sstevel@tonic-gate */ 3207c478bd9Sstevel@tonic-gate 3217c478bd9Sstevel@tonic-gate #define LCALLSIZE 7 3227c478bd9Sstevel@tonic-gate 3237c478bd9Sstevel@tonic-gate static int 324*ddece0baSsethg instr_is_lcall_syscall(caddr_t pc) 3257c478bd9Sstevel@tonic-gate { 3267c478bd9Sstevel@tonic-gate uchar_t instr[LCALLSIZE]; 3277c478bd9Sstevel@tonic-gate 3287c478bd9Sstevel@tonic-gate if (copyin_nowatch(pc, (caddr_t)instr, LCALLSIZE) == 0 && 3297c478bd9Sstevel@tonic-gate instr[0] == 0x9a && 3307c478bd9Sstevel@tonic-gate instr[1] == 0 && 3317c478bd9Sstevel@tonic-gate instr[2] == 0 && 3327c478bd9Sstevel@tonic-gate instr[3] == 0 && 3337c478bd9Sstevel@tonic-gate instr[4] == 0 && 3347c478bd9Sstevel@tonic-gate (instr[5] == 0x7 || instr[5] == 0x27) && 3357c478bd9Sstevel@tonic-gate instr[6] == 0) 3367c478bd9Sstevel@tonic-gate return (1); 3377c478bd9Sstevel@tonic-gate 3387c478bd9Sstevel@tonic-gate return (0); 3397c478bd9Sstevel@tonic-gate } 3407c478bd9Sstevel@tonic-gate 341130a12b8Sfvdl #ifdef __amd64 342130a12b8Sfvdl 343130a12b8Sfvdl /* 344ae115bc7Smrj * In the first revisions of amd64 CPUs produced by AMD, the LAHF and 345ae115bc7Smrj * SAHF instructions were not implemented in 64-bit mode. Later revisions 346130a12b8Sfvdl * did implement these instructions. An extension to the cpuid instruction 347130a12b8Sfvdl * was added to check for the capability of executing these instructions 348ae115bc7Smrj * in 64-bit mode. 349130a12b8Sfvdl * 350130a12b8Sfvdl * Intel originally did not implement these instructions in EM64T either, 351130a12b8Sfvdl * but added them in later revisions. 352130a12b8Sfvdl * 353130a12b8Sfvdl * So, there are different chip revisions by both vendors out there that 354130a12b8Sfvdl * may or may not implement these instructions. The easy solution is to 355130a12b8Sfvdl * just always emulate these instructions on demand. 356130a12b8Sfvdl * 357130a12b8Sfvdl * SAHF == store %ah in the lower 8 bits of %rflags (opcode 0x9e) 358130a12b8Sfvdl * LAHF == load the lower 8 bits of %rflags into %ah (opcode 0x9f) 359130a12b8Sfvdl */ 360130a12b8Sfvdl 361130a12b8Sfvdl #define LSAHFSIZE 1 362130a12b8Sfvdl 363130a12b8Sfvdl static int 364130a12b8Sfvdl instr_is_lsahf(caddr_t pc, uchar_t *instr) 365130a12b8Sfvdl { 366130a12b8Sfvdl if (copyin_nowatch(pc, (caddr_t)instr, LSAHFSIZE) == 0 && 367130a12b8Sfvdl (*instr == 0x9e || *instr == 0x9f)) 368130a12b8Sfvdl return (1); 369130a12b8Sfvdl return (0); 370130a12b8Sfvdl } 371130a12b8Sfvdl 372130a12b8Sfvdl /* 373130a12b8Sfvdl * Emulate the LAHF and SAHF instructions. The reference manuals define 374130a12b8Sfvdl * these instructions to always load/store bit 1 as a 1, and bits 3 and 5 375130a12b8Sfvdl * as a 0. The other, defined, bits are copied (the PS_ICC bits and PS_P). 376130a12b8Sfvdl * 377130a12b8Sfvdl * Note that %ah is bits 8-15 of %rax. 378130a12b8Sfvdl */ 379130a12b8Sfvdl static void 380130a12b8Sfvdl emulate_lsahf(struct regs *rp, uchar_t instr) 381130a12b8Sfvdl { 382130a12b8Sfvdl if (instr == 0x9e) { 383130a12b8Sfvdl /* sahf. Copy bits from %ah to flags. */ 384130a12b8Sfvdl rp->r_ps = (rp->r_ps & ~0xff) | 385130a12b8Sfvdl ((rp->r_rax >> 8) & PSL_LSAHFMASK) | PS_MB1; 386130a12b8Sfvdl } else { 387130a12b8Sfvdl /* lahf. Copy bits from flags to %ah. */ 388130a12b8Sfvdl rp->r_rax = (rp->r_rax & ~0xff00) | 389130a12b8Sfvdl (((rp->r_ps & PSL_LSAHFMASK) | PS_MB1) << 8); 390130a12b8Sfvdl } 391130a12b8Sfvdl rp->r_pc += LSAHFSIZE; 392130a12b8Sfvdl } 393130a12b8Sfvdl #endif /* __amd64 */ 394130a12b8Sfvdl 3957c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 3967c478bd9Sstevel@tonic-gate 3977c478bd9Sstevel@tonic-gate /* 3987c478bd9Sstevel@tonic-gate * Test to see if the instruction at pc is a prefetch instruction. 3997c478bd9Sstevel@tonic-gate * 4007c478bd9Sstevel@tonic-gate * The first byte of prefetch instructions is always 0x0F. 4017c478bd9Sstevel@tonic-gate * The second byte is 0x18 for regular prefetch or 0x0D for AMD 3dnow prefetch. 4027c478bd9Sstevel@tonic-gate * The third byte is between 0 and 3 inclusive. 4037c478bd9Sstevel@tonic-gate */ 4047c478bd9Sstevel@tonic-gate 4057c478bd9Sstevel@tonic-gate #define PREFETCHSIZE 3 4067c478bd9Sstevel@tonic-gate 4077c478bd9Sstevel@tonic-gate static int 4087c478bd9Sstevel@tonic-gate cmp_to_prefetch(uchar_t *p) 4097c478bd9Sstevel@tonic-gate { 4107c478bd9Sstevel@tonic-gate if (*p == 0x0F && (*(p+1) == 0x18 || *(p+1) == 0x0D) && *(p+2) <= 3) 4117c478bd9Sstevel@tonic-gate return (1); 4127c478bd9Sstevel@tonic-gate return (0); 4137c478bd9Sstevel@tonic-gate } 4147c478bd9Sstevel@tonic-gate 4157c478bd9Sstevel@tonic-gate static int 4167c478bd9Sstevel@tonic-gate instr_is_prefetch(caddr_t pc) 4177c478bd9Sstevel@tonic-gate { 4187c478bd9Sstevel@tonic-gate uchar_t instr[PREFETCHSIZE]; 4197c478bd9Sstevel@tonic-gate int error; 4207c478bd9Sstevel@tonic-gate 4217c478bd9Sstevel@tonic-gate error = copyin_nowatch(pc, (caddr_t)instr, PREFETCHSIZE); 4227c478bd9Sstevel@tonic-gate 4237c478bd9Sstevel@tonic-gate if (error == 0 && cmp_to_prefetch(instr)) 4247c478bd9Sstevel@tonic-gate return (1); 4257c478bd9Sstevel@tonic-gate return (0); 4267c478bd9Sstevel@tonic-gate } 4277c478bd9Sstevel@tonic-gate 4287c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate /* 4317c478bd9Sstevel@tonic-gate * Called from the trap handler when a processor trap occurs. 4327c478bd9Sstevel@tonic-gate * 4337c478bd9Sstevel@tonic-gate * Note: All user-level traps that might call stop() must exit 4347c478bd9Sstevel@tonic-gate * trap() by 'goto out' or by falling through. 435ae115bc7Smrj * Note Also: trap() is usually called with interrupts enabled, (PS_IE == 1) 436ae115bc7Smrj * however, there are paths that arrive here with PS_IE == 0 so special care 437ae115bc7Smrj * must be taken in those cases. 4387c478bd9Sstevel@tonic-gate */ 4397c478bd9Sstevel@tonic-gate void 4407c478bd9Sstevel@tonic-gate trap(struct regs *rp, caddr_t addr, processorid_t cpuid) 4417c478bd9Sstevel@tonic-gate { 442ae115bc7Smrj kthread_t *ct = curthread; 4437c478bd9Sstevel@tonic-gate enum seg_rw rw; 4447c478bd9Sstevel@tonic-gate unsigned type; 445ae115bc7Smrj proc_t *p = ttoproc(ct); 446ae115bc7Smrj klwp_t *lwp = ttolwp(ct); 4477c478bd9Sstevel@tonic-gate uintptr_t lofault; 4487c478bd9Sstevel@tonic-gate faultcode_t pagefault(), res, errcode; 4497c478bd9Sstevel@tonic-gate enum fault_type fault_type; 4507c478bd9Sstevel@tonic-gate k_siginfo_t siginfo; 4517c478bd9Sstevel@tonic-gate uint_t fault = 0; 4527c478bd9Sstevel@tonic-gate int mstate; 4537c478bd9Sstevel@tonic-gate int sicode = 0; 4547c478bd9Sstevel@tonic-gate int watchcode; 4557c478bd9Sstevel@tonic-gate int watchpage; 4567c478bd9Sstevel@tonic-gate caddr_t vaddr; 4579acbbeafSnn int singlestep_twiddle; 4587c478bd9Sstevel@tonic-gate size_t sz; 4597c478bd9Sstevel@tonic-gate int ta; 460130a12b8Sfvdl #ifdef __amd64 461130a12b8Sfvdl uchar_t instr; 462130a12b8Sfvdl #endif 4637c478bd9Sstevel@tonic-gate 4647c478bd9Sstevel@tonic-gate ASSERT_STACK_ALIGNED(); 4657c478bd9Sstevel@tonic-gate 4667c478bd9Sstevel@tonic-gate type = rp->r_trapno; 4677c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, trap, 1); 468ae115bc7Smrj ASSERT(ct->t_schedflag & TS_DONT_SWAP); 4697c478bd9Sstevel@tonic-gate 4707c478bd9Sstevel@tonic-gate if (type == T_PGFLT) { 4717c478bd9Sstevel@tonic-gate 4727c478bd9Sstevel@tonic-gate errcode = rp->r_err; 4737c478bd9Sstevel@tonic-gate if (errcode & PF_ERR_WRITE) 4747c478bd9Sstevel@tonic-gate rw = S_WRITE; 4757c478bd9Sstevel@tonic-gate else if ((caddr_t)rp->r_pc == addr || 4767c478bd9Sstevel@tonic-gate (mmu.pt_nx != 0 && (errcode & PF_ERR_EXEC))) 4777c478bd9Sstevel@tonic-gate rw = S_EXEC; 4787c478bd9Sstevel@tonic-gate else 4797c478bd9Sstevel@tonic-gate rw = S_READ; 4807c478bd9Sstevel@tonic-gate 4817c478bd9Sstevel@tonic-gate #if defined(__i386) 4827c478bd9Sstevel@tonic-gate /* 4837c478bd9Sstevel@tonic-gate * Pentium Pro work-around 4847c478bd9Sstevel@tonic-gate */ 4857c478bd9Sstevel@tonic-gate if ((errcode & PF_ERR_PROT) && pentiumpro_bug4046376) { 4867c478bd9Sstevel@tonic-gate uint_t attr; 4877c478bd9Sstevel@tonic-gate uint_t priv_violation; 4887c478bd9Sstevel@tonic-gate uint_t access_violation; 4897c478bd9Sstevel@tonic-gate 4907c478bd9Sstevel@tonic-gate if (hat_getattr(addr < (caddr_t)kernelbase ? 4917c478bd9Sstevel@tonic-gate curproc->p_as->a_hat : kas.a_hat, addr, &attr) 4927c478bd9Sstevel@tonic-gate == -1) { 4937c478bd9Sstevel@tonic-gate errcode &= ~PF_ERR_PROT; 4947c478bd9Sstevel@tonic-gate } else { 4957c478bd9Sstevel@tonic-gate priv_violation = (errcode & PF_ERR_USER) && 4967c478bd9Sstevel@tonic-gate !(attr & PROT_USER); 4977c478bd9Sstevel@tonic-gate access_violation = (errcode & PF_ERR_WRITE) && 4987c478bd9Sstevel@tonic-gate !(attr & PROT_WRITE); 4997c478bd9Sstevel@tonic-gate if (!priv_violation && !access_violation) 5007c478bd9Sstevel@tonic-gate goto cleanup; 5017c478bd9Sstevel@tonic-gate } 5027c478bd9Sstevel@tonic-gate } 5037c478bd9Sstevel@tonic-gate #endif /* __i386 */ 5047c478bd9Sstevel@tonic-gate 505ae115bc7Smrj } else if (type == T_SGLSTP && lwp != NULL) 506ae115bc7Smrj lwp->lwp_pcb.pcb_drstat = (uintptr_t)addr; 5077c478bd9Sstevel@tonic-gate 5087c478bd9Sstevel@tonic-gate if (tdebug) 5097c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 5107c478bd9Sstevel@tonic-gate 5117c478bd9Sstevel@tonic-gate if (USERMODE(rp->r_cs)) { 5127c478bd9Sstevel@tonic-gate /* 5137c478bd9Sstevel@tonic-gate * Set up the current cred to use during this trap. u_cred 5147c478bd9Sstevel@tonic-gate * no longer exists. t_cred is used instead. 5157c478bd9Sstevel@tonic-gate * The current process credential applies to the thread for 5167c478bd9Sstevel@tonic-gate * the entire trap. If trapping from the kernel, this 5177c478bd9Sstevel@tonic-gate * should already be set up. 5187c478bd9Sstevel@tonic-gate */ 519ae115bc7Smrj if (ct->t_cred != p->p_cred) { 520ae115bc7Smrj cred_t *oldcred = ct->t_cred; 5217c478bd9Sstevel@tonic-gate /* 5227c478bd9Sstevel@tonic-gate * DTrace accesses t_cred in probe context. t_cred 5237c478bd9Sstevel@tonic-gate * must always be either NULL, or point to a valid, 5247c478bd9Sstevel@tonic-gate * allocated cred structure. 5257c478bd9Sstevel@tonic-gate */ 526ae115bc7Smrj ct->t_cred = crgetcred(); 5277c478bd9Sstevel@tonic-gate crfree(oldcred); 5287c478bd9Sstevel@tonic-gate } 5297c478bd9Sstevel@tonic-gate ASSERT(lwp != NULL); 5307c478bd9Sstevel@tonic-gate type |= USER; 5317c478bd9Sstevel@tonic-gate ASSERT(lwptoregs(lwp) == rp); 5327c478bd9Sstevel@tonic-gate lwp->lwp_state = LWP_SYS; 5337c478bd9Sstevel@tonic-gate 5347c478bd9Sstevel@tonic-gate switch (type) { 5357c478bd9Sstevel@tonic-gate case T_PGFLT + USER: 5367c478bd9Sstevel@tonic-gate if ((caddr_t)rp->r_pc == addr) 5377c478bd9Sstevel@tonic-gate mstate = LMS_TFAULT; 5387c478bd9Sstevel@tonic-gate else 5397c478bd9Sstevel@tonic-gate mstate = LMS_DFAULT; 5407c478bd9Sstevel@tonic-gate break; 5417c478bd9Sstevel@tonic-gate default: 5427c478bd9Sstevel@tonic-gate mstate = LMS_TRAP; 5437c478bd9Sstevel@tonic-gate break; 5447c478bd9Sstevel@tonic-gate } 5457c478bd9Sstevel@tonic-gate /* Kernel probe */ 5467c478bd9Sstevel@tonic-gate TNF_PROBE_1(thread_state, "thread", /* CSTYLED */, 5477c478bd9Sstevel@tonic-gate tnf_microstate, state, mstate); 548ae115bc7Smrj mstate = new_mstate(ct, mstate); 5497c478bd9Sstevel@tonic-gate 5507c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 5517c478bd9Sstevel@tonic-gate } 5527c478bd9Sstevel@tonic-gate 5537c478bd9Sstevel@tonic-gate switch (type) { 5547c478bd9Sstevel@tonic-gate case T_PGFLT + USER: 5557c478bd9Sstevel@tonic-gate case T_SGLSTP: 5567c478bd9Sstevel@tonic-gate case T_SGLSTP + USER: 5577c478bd9Sstevel@tonic-gate case T_BPTFLT + USER: 5587c478bd9Sstevel@tonic-gate break; 5597c478bd9Sstevel@tonic-gate 5607c478bd9Sstevel@tonic-gate default: 5617c478bd9Sstevel@tonic-gate FTRACE_2("trap(): type=0x%lx, regs=0x%lx", 5627c478bd9Sstevel@tonic-gate (ulong_t)type, (ulong_t)rp); 5637c478bd9Sstevel@tonic-gate break; 5647c478bd9Sstevel@tonic-gate } 5657c478bd9Sstevel@tonic-gate 5667c478bd9Sstevel@tonic-gate switch (type) { 5677c478bd9Sstevel@tonic-gate default: 5687c478bd9Sstevel@tonic-gate if (type & USER) { 5697c478bd9Sstevel@tonic-gate if (tudebug) 5707c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 5717c478bd9Sstevel@tonic-gate printf("trap: Unknown trap type %d in user mode\n", 5727c478bd9Sstevel@tonic-gate type & ~USER); 5737c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 5747c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLTRP; 5757c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 5767c478bd9Sstevel@tonic-gate siginfo.si_trapno = type & ~USER; 5777c478bd9Sstevel@tonic-gate fault = FLTILL; 5787c478bd9Sstevel@tonic-gate break; 5797c478bd9Sstevel@tonic-gate } else { 5807c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 5817c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 5827c478bd9Sstevel@tonic-gate } 5837c478bd9Sstevel@tonic-gate 5847c478bd9Sstevel@tonic-gate case T_PGFLT: /* system page fault */ 5857c478bd9Sstevel@tonic-gate /* 5867c478bd9Sstevel@tonic-gate * If we're under on_trap() protection (see <sys/ontrap.h>), 5877c478bd9Sstevel@tonic-gate * set ot_trap and longjmp back to the on_trap() call site. 5887c478bd9Sstevel@tonic-gate */ 589ae115bc7Smrj if ((ct->t_ontrap != NULL) && 590ae115bc7Smrj (ct->t_ontrap->ot_prot & OT_DATA_ACCESS)) { 591ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_DATA_ACCESS; 5927c478bd9Sstevel@tonic-gate longjmp(&curthread->t_ontrap->ot_jmpbuf); 5937c478bd9Sstevel@tonic-gate } 5947c478bd9Sstevel@tonic-gate 5957c478bd9Sstevel@tonic-gate /* 5967c478bd9Sstevel@tonic-gate * See if we can handle as pagefault. Save lofault 5977c478bd9Sstevel@tonic-gate * across this. Here we assume that an address 5987c478bd9Sstevel@tonic-gate * less than KERNELBASE is a user fault. 5997c478bd9Sstevel@tonic-gate * We can do this as copy.s routines verify that the 6007c478bd9Sstevel@tonic-gate * starting address is less than KERNELBASE before 6017c478bd9Sstevel@tonic-gate * starting and because we know that we always have 6027c478bd9Sstevel@tonic-gate * KERNELBASE mapped as invalid to serve as a "barrier". 6037c478bd9Sstevel@tonic-gate */ 604ae115bc7Smrj lofault = ct->t_lofault; 605ae115bc7Smrj ct->t_lofault = 0; 6067c478bd9Sstevel@tonic-gate 607ae115bc7Smrj mstate = new_mstate(ct, LMS_KFAULT); 6087c478bd9Sstevel@tonic-gate 6097c478bd9Sstevel@tonic-gate if (addr < (caddr_t)kernelbase) { 6107c478bd9Sstevel@tonic-gate res = pagefault(addr, 6117c478bd9Sstevel@tonic-gate (errcode & PF_ERR_PROT)? F_PROT: F_INVAL, rw, 0); 6127c478bd9Sstevel@tonic-gate if (res == FC_NOMAP && 6137c478bd9Sstevel@tonic-gate addr < p->p_usrstack && 6147c478bd9Sstevel@tonic-gate grow(addr)) 6157c478bd9Sstevel@tonic-gate res = 0; 6167c478bd9Sstevel@tonic-gate } else { 6177c478bd9Sstevel@tonic-gate res = pagefault(addr, 6187c478bd9Sstevel@tonic-gate (errcode & PF_ERR_PROT)? F_PROT: F_INVAL, rw, 1); 6197c478bd9Sstevel@tonic-gate } 620ae115bc7Smrj (void) new_mstate(ct, mstate); 6217c478bd9Sstevel@tonic-gate 6227c478bd9Sstevel@tonic-gate /* 6237c478bd9Sstevel@tonic-gate * Restore lofault. If we resolved the fault, exit. 6247c478bd9Sstevel@tonic-gate * If we didn't and lofault wasn't set, die. 6257c478bd9Sstevel@tonic-gate */ 626ae115bc7Smrj ct->t_lofault = lofault; 6277c478bd9Sstevel@tonic-gate if (res == 0) 6287c478bd9Sstevel@tonic-gate goto cleanup; 6297c478bd9Sstevel@tonic-gate 6307c478bd9Sstevel@tonic-gate #if defined(OPTERON_ERRATUM_93) && defined(_LP64) 6317c478bd9Sstevel@tonic-gate if (lofault == 0 && opteron_erratum_93) { 6327c478bd9Sstevel@tonic-gate /* 6337c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 93. On return from 6347c478bd9Sstevel@tonic-gate * a System Managment Interrupt at a HLT instruction 6357c478bd9Sstevel@tonic-gate * the %rip might be truncated to a 32 bit value. 6367c478bd9Sstevel@tonic-gate * BIOS is supposed to fix this, but some don't. 6377c478bd9Sstevel@tonic-gate * If this occurs we simply restore the high order bits. 6387c478bd9Sstevel@tonic-gate * The HLT instruction is 1 byte of 0xf4. 6397c478bd9Sstevel@tonic-gate */ 6407c478bd9Sstevel@tonic-gate uintptr_t rip = rp->r_pc; 6417c478bd9Sstevel@tonic-gate 6427c478bd9Sstevel@tonic-gate if ((rip & 0xfffffffful) == rip) { 6437c478bd9Sstevel@tonic-gate rip |= 0xfffffffful << 32; 6447c478bd9Sstevel@tonic-gate if (hat_getpfnum(kas.a_hat, (caddr_t)rip) != 6457c478bd9Sstevel@tonic-gate PFN_INVALID && 6467c478bd9Sstevel@tonic-gate (*(uchar_t *)rip == 0xf4 || 6477c478bd9Sstevel@tonic-gate *(uchar_t *)(rip - 1) == 0xf4)) { 6487c478bd9Sstevel@tonic-gate rp->r_pc = rip; 6497c478bd9Sstevel@tonic-gate goto cleanup; 6507c478bd9Sstevel@tonic-gate } 6517c478bd9Sstevel@tonic-gate } 6527c478bd9Sstevel@tonic-gate } 6537c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_93 && _LP64 */ 6547c478bd9Sstevel@tonic-gate 6557c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 6567c478bd9Sstevel@tonic-gate if (lofault == 0 && opteron_erratum_91) { 6577c478bd9Sstevel@tonic-gate /* 6587c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 91. Prefetches may 6597c478bd9Sstevel@tonic-gate * generate a page fault (they're not supposed to do 6607c478bd9Sstevel@tonic-gate * that!). If this occurs we simply return back to the 6617c478bd9Sstevel@tonic-gate * instruction. 6627c478bd9Sstevel@tonic-gate */ 6637c478bd9Sstevel@tonic-gate caddr_t pc = (caddr_t)rp->r_pc; 6647c478bd9Sstevel@tonic-gate 6657c478bd9Sstevel@tonic-gate /* 6667c478bd9Sstevel@tonic-gate * If the faulting PC is not mapped, this is a 6677c478bd9Sstevel@tonic-gate * legitimate kernel page fault that must result in a 6687c478bd9Sstevel@tonic-gate * panic. If the faulting PC is mapped, it could contain 6697c478bd9Sstevel@tonic-gate * a prefetch instruction. Check for that here. 6707c478bd9Sstevel@tonic-gate */ 6717c478bd9Sstevel@tonic-gate if (hat_getpfnum(kas.a_hat, pc) != PFN_INVALID) { 6727c478bd9Sstevel@tonic-gate if (cmp_to_prefetch((uchar_t *)pc)) { 6737c478bd9Sstevel@tonic-gate #ifdef DEBUG 6747c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Opteron erratum 91 " 6757c478bd9Sstevel@tonic-gate "occurred: kernel prefetch" 6767c478bd9Sstevel@tonic-gate " at %p generated a page fault!", 6777c478bd9Sstevel@tonic-gate (void *)rp->r_pc); 6787c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 6797c478bd9Sstevel@tonic-gate goto cleanup; 6807c478bd9Sstevel@tonic-gate } 6817c478bd9Sstevel@tonic-gate } 6827c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 6837c478bd9Sstevel@tonic-gate } 6847c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 6857c478bd9Sstevel@tonic-gate 6867c478bd9Sstevel@tonic-gate if (lofault == 0) 6877c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 6887c478bd9Sstevel@tonic-gate 6897c478bd9Sstevel@tonic-gate /* 6907c478bd9Sstevel@tonic-gate * Cannot resolve fault. Return to lofault. 6917c478bd9Sstevel@tonic-gate */ 6927c478bd9Sstevel@tonic-gate if (lodebug) { 6937c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 6947c478bd9Sstevel@tonic-gate traceregs(rp); 6957c478bd9Sstevel@tonic-gate } 6967c478bd9Sstevel@tonic-gate if (FC_CODE(res) == FC_OBJERR) 6977c478bd9Sstevel@tonic-gate res = FC_ERRNO(res); 6987c478bd9Sstevel@tonic-gate else 6997c478bd9Sstevel@tonic-gate res = EFAULT; 7007c478bd9Sstevel@tonic-gate rp->r_r0 = res; 701ae115bc7Smrj rp->r_pc = ct->t_lofault; 7027c478bd9Sstevel@tonic-gate goto cleanup; 7037c478bd9Sstevel@tonic-gate 7047c478bd9Sstevel@tonic-gate case T_PGFLT + USER: /* user page fault */ 7057c478bd9Sstevel@tonic-gate if (faultdebug) { 7067c478bd9Sstevel@tonic-gate char *fault_str; 7077c478bd9Sstevel@tonic-gate 7087c478bd9Sstevel@tonic-gate switch (rw) { 7097c478bd9Sstevel@tonic-gate case S_READ: 7107c478bd9Sstevel@tonic-gate fault_str = "read"; 7117c478bd9Sstevel@tonic-gate break; 7127c478bd9Sstevel@tonic-gate case S_WRITE: 7137c478bd9Sstevel@tonic-gate fault_str = "write"; 7147c478bd9Sstevel@tonic-gate break; 7157c478bd9Sstevel@tonic-gate case S_EXEC: 7167c478bd9Sstevel@tonic-gate fault_str = "exec"; 7177c478bd9Sstevel@tonic-gate break; 7187c478bd9Sstevel@tonic-gate default: 7197c478bd9Sstevel@tonic-gate fault_str = ""; 7207c478bd9Sstevel@tonic-gate break; 7217c478bd9Sstevel@tonic-gate } 7227c478bd9Sstevel@tonic-gate printf("user %s fault: addr=0x%lx errcode=0x%x\n", 7237c478bd9Sstevel@tonic-gate fault_str, (uintptr_t)addr, errcode); 7247c478bd9Sstevel@tonic-gate } 7257c478bd9Sstevel@tonic-gate 7267c478bd9Sstevel@tonic-gate #if defined(OPTERON_ERRATUM_100) && defined(_LP64) 7277c478bd9Sstevel@tonic-gate /* 7287c478bd9Sstevel@tonic-gate * Workaround for AMD erratum 100 7297c478bd9Sstevel@tonic-gate * 7307c478bd9Sstevel@tonic-gate * A 32-bit process may receive a page fault on a non 7317c478bd9Sstevel@tonic-gate * 32-bit address by mistake. The range of the faulting 7327c478bd9Sstevel@tonic-gate * address will be 7337c478bd9Sstevel@tonic-gate * 7347c478bd9Sstevel@tonic-gate * 0xffffffff80000000 .. 0xffffffffffffffff or 7357c478bd9Sstevel@tonic-gate * 0x0000000100000000 .. 0x000000017fffffff 7367c478bd9Sstevel@tonic-gate * 7377c478bd9Sstevel@tonic-gate * The fault is always due to an instruction fetch, however 7387c478bd9Sstevel@tonic-gate * the value of r_pc should be correct (in 32 bit range), 7397c478bd9Sstevel@tonic-gate * so we ignore the page fault on the bogus address. 7407c478bd9Sstevel@tonic-gate */ 7417c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_ILP32 && 7427c478bd9Sstevel@tonic-gate (0xffffffff80000000 <= (uintptr_t)addr || 7437c478bd9Sstevel@tonic-gate (0x100000000 <= (uintptr_t)addr && 7447c478bd9Sstevel@tonic-gate (uintptr_t)addr <= 0x17fffffff))) { 7457c478bd9Sstevel@tonic-gate if (!opteron_erratum_100) 7467c478bd9Sstevel@tonic-gate panic("unexpected erratum #100"); 7477c478bd9Sstevel@tonic-gate if (rp->r_pc <= 0xffffffff) 7487c478bd9Sstevel@tonic-gate goto out; 7497c478bd9Sstevel@tonic-gate } 7507c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_100 && _LP64 */ 7517c478bd9Sstevel@tonic-gate 7527c478bd9Sstevel@tonic-gate ASSERT(!(curthread->t_flag & T_WATCHPT)); 7537c478bd9Sstevel@tonic-gate watchpage = (pr_watch_active(p) && pr_is_watchpage(addr, rw)); 7547c478bd9Sstevel@tonic-gate #ifdef __i386 7557c478bd9Sstevel@tonic-gate /* 7567c478bd9Sstevel@tonic-gate * In 32-bit mode, the lcall (system call) instruction fetches 7577c478bd9Sstevel@tonic-gate * one word from the stack, at the stack pointer, because of the 7587c478bd9Sstevel@tonic-gate * way the call gate is constructed. This is a bogus 7597c478bd9Sstevel@tonic-gate * read and should not be counted as a read watchpoint. 7607c478bd9Sstevel@tonic-gate * We work around the problem here by testing to see if 7617c478bd9Sstevel@tonic-gate * this situation applies and, if so, simply jumping to 7627c478bd9Sstevel@tonic-gate * the code in locore.s that fields the system call trap. 7637c478bd9Sstevel@tonic-gate * The registers on the stack are already set up properly 7647c478bd9Sstevel@tonic-gate * due to the match between the call gate sequence and the 7657c478bd9Sstevel@tonic-gate * trap gate sequence. We just have to adjust the pc. 7667c478bd9Sstevel@tonic-gate */ 7677c478bd9Sstevel@tonic-gate if (watchpage && addr == (caddr_t)rp->r_sp && 768*ddece0baSsethg rw == S_READ && instr_is_lcall_syscall((caddr_t)rp->r_pc)) { 7697c478bd9Sstevel@tonic-gate extern void watch_syscall(void); 7707c478bd9Sstevel@tonic-gate 7717c478bd9Sstevel@tonic-gate rp->r_pc += LCALLSIZE; 7727c478bd9Sstevel@tonic-gate watch_syscall(); /* never returns */ 7737c478bd9Sstevel@tonic-gate /* NOTREACHED */ 7747c478bd9Sstevel@tonic-gate } 7757c478bd9Sstevel@tonic-gate #endif /* __i386 */ 7767c478bd9Sstevel@tonic-gate vaddr = addr; 7777c478bd9Sstevel@tonic-gate if (!watchpage || (sz = instr_size(rp, &vaddr, rw)) <= 0) 7787c478bd9Sstevel@tonic-gate fault_type = (errcode & PF_ERR_PROT)? F_PROT: F_INVAL; 7797c478bd9Sstevel@tonic-gate else if ((watchcode = pr_is_watchpoint(&vaddr, &ta, 7807c478bd9Sstevel@tonic-gate sz, NULL, rw)) != 0) { 7817c478bd9Sstevel@tonic-gate if (ta) { 7827c478bd9Sstevel@tonic-gate do_watch_step(vaddr, sz, rw, 7837c478bd9Sstevel@tonic-gate watchcode, rp->r_pc); 7847c478bd9Sstevel@tonic-gate fault_type = F_INVAL; 7857c478bd9Sstevel@tonic-gate } else { 7867c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 7877c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 7887c478bd9Sstevel@tonic-gate siginfo.si_code = watchcode; 7897c478bd9Sstevel@tonic-gate siginfo.si_addr = vaddr; 7907c478bd9Sstevel@tonic-gate siginfo.si_trapafter = 0; 7917c478bd9Sstevel@tonic-gate siginfo.si_pc = (caddr_t)rp->r_pc; 7927c478bd9Sstevel@tonic-gate fault = FLTWATCH; 7937c478bd9Sstevel@tonic-gate break; 7947c478bd9Sstevel@tonic-gate } 7957c478bd9Sstevel@tonic-gate } else { 7967c478bd9Sstevel@tonic-gate /* XXX pr_watch_emul() never succeeds (for now) */ 7977c478bd9Sstevel@tonic-gate if (rw != S_EXEC && pr_watch_emul(rp, vaddr, rw)) 7987c478bd9Sstevel@tonic-gate goto out; 7997c478bd9Sstevel@tonic-gate do_watch_step(vaddr, sz, rw, 0, 0); 8007c478bd9Sstevel@tonic-gate fault_type = F_INVAL; 8017c478bd9Sstevel@tonic-gate } 8027c478bd9Sstevel@tonic-gate 8037c478bd9Sstevel@tonic-gate res = pagefault(addr, fault_type, rw, 0); 8047c478bd9Sstevel@tonic-gate 8057c478bd9Sstevel@tonic-gate /* 8067c478bd9Sstevel@tonic-gate * If pagefault() succeeded, ok. 8077c478bd9Sstevel@tonic-gate * Otherwise attempt to grow the stack. 8087c478bd9Sstevel@tonic-gate */ 8097c478bd9Sstevel@tonic-gate if (res == 0 || 8107c478bd9Sstevel@tonic-gate (res == FC_NOMAP && 8117c478bd9Sstevel@tonic-gate addr < p->p_usrstack && 8127c478bd9Sstevel@tonic-gate grow(addr))) { 8137c478bd9Sstevel@tonic-gate lwp->lwp_lastfault = FLTPAGE; 8147c478bd9Sstevel@tonic-gate lwp->lwp_lastfaddr = addr; 8157c478bd9Sstevel@tonic-gate if (prismember(&p->p_fltmask, FLTPAGE)) { 8167c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 8177c478bd9Sstevel@tonic-gate siginfo.si_addr = addr; 8187c478bd9Sstevel@tonic-gate (void) stop_on_fault(FLTPAGE, &siginfo); 8197c478bd9Sstevel@tonic-gate } 8207c478bd9Sstevel@tonic-gate goto out; 8217c478bd9Sstevel@tonic-gate } else if (res == FC_PROT && addr < p->p_usrstack && 8227c478bd9Sstevel@tonic-gate (mmu.pt_nx != 0 && (errcode & PF_ERR_EXEC))) { 8237c478bd9Sstevel@tonic-gate report_stack_exec(p, addr); 8247c478bd9Sstevel@tonic-gate } 8257c478bd9Sstevel@tonic-gate 8267c478bd9Sstevel@tonic-gate #ifdef OPTERON_ERRATUM_91 8277c478bd9Sstevel@tonic-gate /* 8287c478bd9Sstevel@tonic-gate * Workaround for Opteron Erratum 91. Prefetches may generate a 8297c478bd9Sstevel@tonic-gate * page fault (they're not supposed to do that!). If this 8307c478bd9Sstevel@tonic-gate * occurs we simply return back to the instruction. 8317c478bd9Sstevel@tonic-gate * 8327c478bd9Sstevel@tonic-gate * We rely on copyin to properly fault in the page with r_pc. 8337c478bd9Sstevel@tonic-gate */ 8347c478bd9Sstevel@tonic-gate if (opteron_erratum_91 && 8357c478bd9Sstevel@tonic-gate addr != (caddr_t)rp->r_pc && 8367c478bd9Sstevel@tonic-gate instr_is_prefetch((caddr_t)rp->r_pc)) { 8377c478bd9Sstevel@tonic-gate #ifdef DEBUG 8387c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Opteron erratum 91 occurred: " 8397c478bd9Sstevel@tonic-gate "prefetch at %p in pid %d generated a trap!", 8407c478bd9Sstevel@tonic-gate (void *)rp->r_pc, p->p_pid); 8417c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 8427c478bd9Sstevel@tonic-gate goto out; 8437c478bd9Sstevel@tonic-gate } 8447c478bd9Sstevel@tonic-gate #endif /* OPTERON_ERRATUM_91 */ 8457c478bd9Sstevel@tonic-gate 8467c478bd9Sstevel@tonic-gate if (tudebug) 8477c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 8487c478bd9Sstevel@tonic-gate /* 8497c478bd9Sstevel@tonic-gate * In the case where both pagefault and grow fail, 8507c478bd9Sstevel@tonic-gate * set the code to the value provided by pagefault. 8517c478bd9Sstevel@tonic-gate * We map all errors returned from pagefault() to SIGSEGV. 8527c478bd9Sstevel@tonic-gate */ 8537c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 8547c478bd9Sstevel@tonic-gate siginfo.si_addr = addr; 8557c478bd9Sstevel@tonic-gate switch (FC_CODE(res)) { 8567c478bd9Sstevel@tonic-gate case FC_HWERR: 8577c478bd9Sstevel@tonic-gate case FC_NOSUPPORT: 8587c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 8597c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRERR; 8607c478bd9Sstevel@tonic-gate fault = FLTACCESS; 8617c478bd9Sstevel@tonic-gate break; 8627c478bd9Sstevel@tonic-gate case FC_ALIGN: 8637c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 8647c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRALN; 8657c478bd9Sstevel@tonic-gate fault = FLTACCESS; 8667c478bd9Sstevel@tonic-gate break; 8677c478bd9Sstevel@tonic-gate case FC_OBJERR: 8687c478bd9Sstevel@tonic-gate if ((siginfo.si_errno = FC_ERRNO(res)) != EINTR) { 8697c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 8707c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_OBJERR; 8717c478bd9Sstevel@tonic-gate fault = FLTACCESS; 8727c478bd9Sstevel@tonic-gate } 8737c478bd9Sstevel@tonic-gate break; 8747c478bd9Sstevel@tonic-gate default: /* FC_NOMAP or FC_PROT */ 8757c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 8767c478bd9Sstevel@tonic-gate siginfo.si_code = 8777c478bd9Sstevel@tonic-gate (res == FC_NOMAP)? SEGV_MAPERR : SEGV_ACCERR; 8787c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 8797c478bd9Sstevel@tonic-gate break; 8807c478bd9Sstevel@tonic-gate } 8817c478bd9Sstevel@tonic-gate break; 8827c478bd9Sstevel@tonic-gate 8837c478bd9Sstevel@tonic-gate case T_ILLINST + USER: /* invalid opcode fault */ 8847c478bd9Sstevel@tonic-gate /* 8857c478bd9Sstevel@tonic-gate * If the syscall instruction is disabled due to LDT usage, a 8867c478bd9Sstevel@tonic-gate * user program that attempts to execute it will trigger a #ud 8877c478bd9Sstevel@tonic-gate * trap. Check for that case here. If this occurs on a CPU which 8887c478bd9Sstevel@tonic-gate * doesn't even support syscall, the result of all of this will 8897c478bd9Sstevel@tonic-gate * be to emulate that particular instruction. 8907c478bd9Sstevel@tonic-gate */ 8917c478bd9Sstevel@tonic-gate if (p->p_ldt != NULL && 892*ddece0baSsethg ldt_rewrite_syscall(rp, p, X86_ASYSC)) 893*ddece0baSsethg goto out; 894130a12b8Sfvdl 895130a12b8Sfvdl #ifdef __amd64 896130a12b8Sfvdl /* 897130a12b8Sfvdl * Emulate the LAHF and SAHF instructions if needed. 898130a12b8Sfvdl * See the instr_is_lsahf function for details. 899130a12b8Sfvdl */ 900130a12b8Sfvdl if (p->p_model == DATAMODEL_LP64 && 901130a12b8Sfvdl instr_is_lsahf((caddr_t)rp->r_pc, &instr)) { 902130a12b8Sfvdl emulate_lsahf(rp, instr); 903130a12b8Sfvdl goto out; 904130a12b8Sfvdl } 905130a12b8Sfvdl #endif 906130a12b8Sfvdl 9077c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 9087c478bd9Sstevel@tonic-gate 9097c478bd9Sstevel@tonic-gate if (tudebug) 9107c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9117c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 9127c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLOPC; 9137c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9147c478bd9Sstevel@tonic-gate fault = FLTILL; 9157c478bd9Sstevel@tonic-gate break; 9167c478bd9Sstevel@tonic-gate 9177c478bd9Sstevel@tonic-gate case T_ZERODIV + USER: /* integer divide by zero */ 9187c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9197c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9207c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9217c478bd9Sstevel@tonic-gate siginfo.si_code = FPE_INTDIV; 9227c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9237c478bd9Sstevel@tonic-gate fault = FLTIZDIV; 9247c478bd9Sstevel@tonic-gate break; 9257c478bd9Sstevel@tonic-gate 9267c478bd9Sstevel@tonic-gate case T_OVFLW + USER: /* integer overflow */ 9277c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9287c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 9297c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9307c478bd9Sstevel@tonic-gate siginfo.si_code = FPE_INTOVF; 9317c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9327c478bd9Sstevel@tonic-gate fault = FLTIOVF; 9337c478bd9Sstevel@tonic-gate break; 9347c478bd9Sstevel@tonic-gate 9357c478bd9Sstevel@tonic-gate case T_NOEXTFLT + USER: /* math coprocessor not available */ 9367c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9377c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 9387c478bd9Sstevel@tonic-gate if (fpnoextflt(rp)) { 9397c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9407c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLOPC; 9417c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9427c478bd9Sstevel@tonic-gate fault = FLTFPE; 9437c478bd9Sstevel@tonic-gate } 9447c478bd9Sstevel@tonic-gate break; 9457c478bd9Sstevel@tonic-gate 9467c478bd9Sstevel@tonic-gate case T_EXTOVRFLT: /* extension overrun fault */ 9477c478bd9Sstevel@tonic-gate /* check if we took a kernel trap on behalf of user */ 9487c478bd9Sstevel@tonic-gate { 9497c478bd9Sstevel@tonic-gate extern void ndptrap_frstor(void); 9507c478bd9Sstevel@tonic-gate if (rp->r_pc != (uintptr_t)ndptrap_frstor) 9517c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 9527c478bd9Sstevel@tonic-gate type |= USER; 9537c478bd9Sstevel@tonic-gate } 9547c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 9557c478bd9Sstevel@tonic-gate case T_EXTOVRFLT + USER: /* extension overrun fault */ 9567c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9577c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 9587c478bd9Sstevel@tonic-gate if (fpextovrflt(rp)) { 9597c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 9607c478bd9Sstevel@tonic-gate siginfo.si_code = SEGV_MAPERR; 9617c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9627c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 9637c478bd9Sstevel@tonic-gate } 9647c478bd9Sstevel@tonic-gate break; 9657c478bd9Sstevel@tonic-gate 9667c478bd9Sstevel@tonic-gate case T_EXTERRFLT: /* x87 floating point exception pending */ 9677c478bd9Sstevel@tonic-gate /* check if we took a kernel trap on behalf of user */ 9687c478bd9Sstevel@tonic-gate { 9697c478bd9Sstevel@tonic-gate extern void ndptrap_frstor(void); 9707c478bd9Sstevel@tonic-gate if (rp->r_pc != (uintptr_t)ndptrap_frstor) 9717c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 9727c478bd9Sstevel@tonic-gate type |= USER; 9737c478bd9Sstevel@tonic-gate } 9747c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 9757c478bd9Sstevel@tonic-gate 9767c478bd9Sstevel@tonic-gate case T_EXTERRFLT + USER: /* x87 floating point exception pending */ 9777c478bd9Sstevel@tonic-gate if (tudebug && tudebugfpe) 9787c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 9797c478bd9Sstevel@tonic-gate if (sicode = fpexterrflt(rp)) { 9807c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 9817c478bd9Sstevel@tonic-gate siginfo.si_code = sicode; 9827c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9837c478bd9Sstevel@tonic-gate fault = FLTFPE; 9847c478bd9Sstevel@tonic-gate } 9857c478bd9Sstevel@tonic-gate break; 9867c478bd9Sstevel@tonic-gate 9877c478bd9Sstevel@tonic-gate case T_SIMDFPE + USER: /* SSE and SSE2 exceptions */ 9887c478bd9Sstevel@tonic-gate if (tudebug && tudebugsse) 9897c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 9907c478bd9Sstevel@tonic-gate if ((x86_feature & (X86_SSE|X86_SSE2)) == 0) { 9917c478bd9Sstevel@tonic-gate /* 9927c478bd9Sstevel@tonic-gate * There are rumours that some user instructions 9937c478bd9Sstevel@tonic-gate * on older CPUs can cause this trap to occur; in 9947c478bd9Sstevel@tonic-gate * which case send a SIGILL instead of a SIGFPE. 9957c478bd9Sstevel@tonic-gate */ 9967c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGILL; 9977c478bd9Sstevel@tonic-gate siginfo.si_code = ILL_ILLTRP; 9987c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 9997c478bd9Sstevel@tonic-gate siginfo.si_trapno = type & ~USER; 10007c478bd9Sstevel@tonic-gate fault = FLTILL; 10017c478bd9Sstevel@tonic-gate } else if ((sicode = fpsimderrflt(rp)) != 0) { 10027c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGFPE; 10037c478bd9Sstevel@tonic-gate siginfo.si_code = sicode; 10047c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 10057c478bd9Sstevel@tonic-gate fault = FLTFPE; 10067c478bd9Sstevel@tonic-gate } 10077c478bd9Sstevel@tonic-gate break; 10087c478bd9Sstevel@tonic-gate 10097c478bd9Sstevel@tonic-gate case T_BPTFLT: /* breakpoint trap */ 10107c478bd9Sstevel@tonic-gate /* 10117c478bd9Sstevel@tonic-gate * Kernel breakpoint traps should only happen when kmdb is 10127c478bd9Sstevel@tonic-gate * active, and even then, it'll have interposed on the IDT, so 10137c478bd9Sstevel@tonic-gate * control won't get here. If it does, we've hit a breakpoint 10147c478bd9Sstevel@tonic-gate * without the debugger, which is very strange, and very 10157c478bd9Sstevel@tonic-gate * fatal. 10167c478bd9Sstevel@tonic-gate */ 10177c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 10187c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 10197c478bd9Sstevel@tonic-gate 10207c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 10217c478bd9Sstevel@tonic-gate break; 10227c478bd9Sstevel@tonic-gate 10237c478bd9Sstevel@tonic-gate case T_SGLSTP: /* single step/hw breakpoint exception */ 10247c478bd9Sstevel@tonic-gate 10257c478bd9Sstevel@tonic-gate /* Now evaluate how we got here */ 10267c478bd9Sstevel@tonic-gate if (lwp != NULL && (lwp->lwp_pcb.pcb_drstat & DR_SINGLESTEP)) { 10277c478bd9Sstevel@tonic-gate /* 10287c478bd9Sstevel@tonic-gate * i386 single-steps even through lcalls which 10297c478bd9Sstevel@tonic-gate * change the privilege level. So we take a trap at 10307c478bd9Sstevel@tonic-gate * the first instruction in privileged mode. 10317c478bd9Sstevel@tonic-gate * 10327c478bd9Sstevel@tonic-gate * Set a flag to indicate that upon completion of 10337c478bd9Sstevel@tonic-gate * the system call, deal with the single-step trap. 10347c478bd9Sstevel@tonic-gate * 10357c478bd9Sstevel@tonic-gate * The same thing happens for sysenter, too. 10367c478bd9Sstevel@tonic-gate */ 10379acbbeafSnn singlestep_twiddle = 0; 10389acbbeafSnn if (rp->r_pc == (uintptr_t)sys_sysenter || 10399acbbeafSnn rp->r_pc == (uintptr_t)brand_sys_sysenter) { 10409acbbeafSnn singlestep_twiddle = 1; 10417c478bd9Sstevel@tonic-gate #if defined(__amd64) 10427c478bd9Sstevel@tonic-gate /* 10439acbbeafSnn * Since we are already on the kernel's 10449acbbeafSnn * %gs, on 64-bit systems the sysenter case 10459acbbeafSnn * needs to adjust the pc to avoid 10469acbbeafSnn * executing the swapgs instruction at the 10479acbbeafSnn * top of the handler. 10487c478bd9Sstevel@tonic-gate */ 10499acbbeafSnn if (rp->r_pc == (uintptr_t)sys_sysenter) 10509acbbeafSnn rp->r_pc = (uintptr_t) 10519acbbeafSnn _sys_sysenter_post_swapgs; 10529acbbeafSnn else 10539acbbeafSnn rp->r_pc = (uintptr_t) 10549acbbeafSnn _brand_sys_sysenter_post_swapgs; 10557c478bd9Sstevel@tonic-gate #endif 10569acbbeafSnn } 10579acbbeafSnn #if defined(__i386) 10589acbbeafSnn else if (rp->r_pc == (uintptr_t)sys_call || 10599acbbeafSnn rp->r_pc == (uintptr_t)brand_sys_call) { 10609acbbeafSnn singlestep_twiddle = 1; 10619acbbeafSnn } 10629acbbeafSnn #endif 10636db33255Sdmick else { 10646db33255Sdmick /* not on sysenter/syscall; uregs available */ 10656db33255Sdmick if (tudebug && tudebugbpt) 10666db33255Sdmick showregs(type, rp, (caddr_t)0); 10676db33255Sdmick } 10689acbbeafSnn if (singlestep_twiddle) { 10697c478bd9Sstevel@tonic-gate rp->r_ps &= ~PS_T; /* turn off trace */ 10707c478bd9Sstevel@tonic-gate lwp->lwp_pcb.pcb_flags |= DEBUG_PENDING; 1071ae115bc7Smrj ct->t_post_sys = 1; 1072d8aa0f5aSsudheer aston(curthread); 10737c478bd9Sstevel@tonic-gate goto cleanup; 10747c478bd9Sstevel@tonic-gate } 10757c478bd9Sstevel@tonic-gate } 10767c478bd9Sstevel@tonic-gate /* XXX - needs review on debugger interface? */ 10777c478bd9Sstevel@tonic-gate if (boothowto & RB_DEBUG) 10787c478bd9Sstevel@tonic-gate debug_enter((char *)NULL); 10797c478bd9Sstevel@tonic-gate else 10807c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 10817c478bd9Sstevel@tonic-gate break; 10827c478bd9Sstevel@tonic-gate 10837c478bd9Sstevel@tonic-gate case T_NMIFLT: /* NMI interrupt */ 10847c478bd9Sstevel@tonic-gate printf("Unexpected NMI in system mode\n"); 10857c478bd9Sstevel@tonic-gate goto cleanup; 10867c478bd9Sstevel@tonic-gate 10877c478bd9Sstevel@tonic-gate case T_NMIFLT + USER: /* NMI interrupt */ 10887c478bd9Sstevel@tonic-gate printf("Unexpected NMI in user mode\n"); 10897c478bd9Sstevel@tonic-gate break; 10907c478bd9Sstevel@tonic-gate 10917c478bd9Sstevel@tonic-gate case T_GPFLT: /* general protection violation */ 10927c478bd9Sstevel@tonic-gate #if defined(__amd64) 10937c478bd9Sstevel@tonic-gate /* 10947c478bd9Sstevel@tonic-gate * On amd64, we can get a #gp from referencing addresses 1095ae115bc7Smrj * in the virtual address hole e.g. from a copyin 1096ae115bc7Smrj * or in update_sregs while updating user semgent registers. 10977c478bd9Sstevel@tonic-gate */ 10987c478bd9Sstevel@tonic-gate 10997c478bd9Sstevel@tonic-gate /* 11007c478bd9Sstevel@tonic-gate * If we're under on_trap() protection (see <sys/ontrap.h>), 11017c478bd9Sstevel@tonic-gate * set ot_trap and longjmp back to the on_trap() call site. 11027c478bd9Sstevel@tonic-gate */ 1103ae115bc7Smrj if (ct->t_ontrap != NULL) { 1104ae115bc7Smrj if (ct->t_ontrap->ot_prot & OT_DATA_ACCESS) 1105ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_DATA_ACCESS; 1106ae115bc7Smrj 1107ae115bc7Smrj if (ct->t_ontrap->ot_prot & OT_SEGMENT_ACCESS) 1108ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_SEGMENT_ACCESS; 11097c478bd9Sstevel@tonic-gate longjmp(&curthread->t_ontrap->ot_jmpbuf); 11107c478bd9Sstevel@tonic-gate } 11117c478bd9Sstevel@tonic-gate 11127c478bd9Sstevel@tonic-gate /* 11137c478bd9Sstevel@tonic-gate * If we're under lofault protection (copyin etc.), 11147c478bd9Sstevel@tonic-gate * longjmp back to lofault with an EFAULT. 11157c478bd9Sstevel@tonic-gate */ 1116ae115bc7Smrj if (ct->t_lofault) { 11177c478bd9Sstevel@tonic-gate /* 11187c478bd9Sstevel@tonic-gate * Fault is not resolvable, so just return to lofault 11197c478bd9Sstevel@tonic-gate */ 11207c478bd9Sstevel@tonic-gate if (lodebug) { 11217c478bd9Sstevel@tonic-gate showregs(type, rp, addr); 11227c478bd9Sstevel@tonic-gate traceregs(rp); 11237c478bd9Sstevel@tonic-gate } 11247c478bd9Sstevel@tonic-gate rp->r_r0 = EFAULT; 1125ae115bc7Smrj rp->r_pc = ct->t_lofault; 11267c478bd9Sstevel@tonic-gate goto cleanup; 11277c478bd9Sstevel@tonic-gate } 11287c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 11297c478bd9Sstevel@tonic-gate #endif 1130ae115bc7Smrj case T_SEGFLT: /* segment not present fault */ 1131ae115bc7Smrj #if defined(__amd64) 1132ae115bc7Smrj /* 1133ae115bc7Smrj * One example of this is #NP in update_sregs while 1134ae115bc7Smrj * attempting to update a user segment register 1135ae115bc7Smrj * that points to a descriptor that is marked not 1136ae115bc7Smrj * present. 1137ae115bc7Smrj */ 1138ae115bc7Smrj if (ct->t_ontrap != NULL && 1139ae115bc7Smrj ct->t_ontrap->ot_prot & OT_SEGMENT_ACCESS) { 1140ae115bc7Smrj ct->t_ontrap->ot_trap |= OT_SEGMENT_ACCESS; 1141ae115bc7Smrj longjmp(&curthread->t_ontrap->ot_jmpbuf); 1142ae115bc7Smrj } 1143ae115bc7Smrj #endif /* __amd64 */ 1144ae115bc7Smrj /*FALLTHROUGH*/ 11457c478bd9Sstevel@tonic-gate case T_STKFLT: /* stack fault */ 11467c478bd9Sstevel@tonic-gate case T_TSSFLT: /* invalid TSS fault */ 11477c478bd9Sstevel@tonic-gate if (tudebug) 11487c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 11497c478bd9Sstevel@tonic-gate if (kern_gpfault(rp)) 11507c478bd9Sstevel@tonic-gate (void) die(type, rp, addr, cpuid); 11517c478bd9Sstevel@tonic-gate goto cleanup; 11520baeff3dSrab /*FALLTHROUGH*/ 11537c478bd9Sstevel@tonic-gate 1154ae115bc7Smrj /* 1155ae115bc7Smrj * ONLY 32-bit PROCESSES can USE a PRIVATE LDT! 64-bit apps 1156ae115bc7Smrj * should have no need for them, so we put a stop to it here. 1157ae115bc7Smrj * 1158ae115bc7Smrj * So: not-present fault is ONLY valid for 32-bit processes with 1159ae115bc7Smrj * a private LDT trying to do a system call. Emulate it. 1160ae115bc7Smrj * 1161ae115bc7Smrj * #gp fault is ONLY valid for 32-bit processes also, which DO NOT 1162ae115bc7Smrj * have a private LDT, and are trying to do a system call. Emulate it. 1163ae115bc7Smrj */ 1164ae115bc7Smrj 11657c478bd9Sstevel@tonic-gate case T_SEGFLT + USER: /* segment not present fault */ 11660baeff3dSrab case T_GPFLT + USER: /* general protection violation */ 11677c478bd9Sstevel@tonic-gate #ifdef _SYSCALL32_IMPL 11680baeff3dSrab if (p->p_model != DATAMODEL_NATIVE) { 11690baeff3dSrab #endif /* _SYSCALL32_IMPL */ 1170*ddece0baSsethg if (instr_is_lcall_syscall((caddr_t)rp->r_pc)) { 11710baeff3dSrab if (type == T_SEGFLT + USER) 11720baeff3dSrab ASSERT(p->p_ldt != NULL); 11730baeff3dSrab 11740baeff3dSrab if ((p->p_ldt == NULL && type == T_GPFLT + USER) || 11750baeff3dSrab type == T_SEGFLT + USER) { 11760baeff3dSrab 11770baeff3dSrab /* 11780baeff3dSrab * The user attempted a system call via the obsolete 11790baeff3dSrab * call gate mechanism. Because the process doesn't have 11800baeff3dSrab * an LDT (i.e. the ldtr contains 0), a #gp results. 11810baeff3dSrab * Emulate the syscall here, just as we do above for a 11820baeff3dSrab * #np trap. 11830baeff3dSrab */ 11840baeff3dSrab 11857c478bd9Sstevel@tonic-gate /* 11867c478bd9Sstevel@tonic-gate * Since this is a not-present trap, rp->r_pc points to 11877c478bd9Sstevel@tonic-gate * the trapping lcall instruction. We need to bump it 11887c478bd9Sstevel@tonic-gate * to the next insn so the app can continue on. 11897c478bd9Sstevel@tonic-gate */ 11907c478bd9Sstevel@tonic-gate rp->r_pc += LCALLSIZE; 11917c478bd9Sstevel@tonic-gate lwp->lwp_regs = rp; 11927c478bd9Sstevel@tonic-gate 11937c478bd9Sstevel@tonic-gate /* 11947c478bd9Sstevel@tonic-gate * Normally the microstate of the LWP is forced back to 11957c478bd9Sstevel@tonic-gate * LMS_USER by the syscall handlers. Emulate that 11967c478bd9Sstevel@tonic-gate * behavior here. 11977c478bd9Sstevel@tonic-gate */ 11987c478bd9Sstevel@tonic-gate mstate = LMS_USER; 11997c478bd9Sstevel@tonic-gate 12007c478bd9Sstevel@tonic-gate dosyscall(); 12017c478bd9Sstevel@tonic-gate goto out; 12020baeff3dSrab } 12030baeff3dSrab } 12040baeff3dSrab #ifdef _SYSCALL32_IMPL 12057c478bd9Sstevel@tonic-gate } 12067c478bd9Sstevel@tonic-gate #endif /* _SYSCALL32_IMPL */ 12077c478bd9Sstevel@tonic-gate /* 12087c478bd9Sstevel@tonic-gate * If the current process is using a private LDT and the 12097c478bd9Sstevel@tonic-gate * trapping instruction is sysenter, the sysenter instruction 12107c478bd9Sstevel@tonic-gate * has been disabled on the CPU because it destroys segment 12117c478bd9Sstevel@tonic-gate * registers. If this is the case, rewrite the instruction to 12127c478bd9Sstevel@tonic-gate * be a safe system call and retry it. If this occurs on a CPU 12137c478bd9Sstevel@tonic-gate * which doesn't even support sysenter, the result of all of 12147c478bd9Sstevel@tonic-gate * this will be to emulate that particular instruction. 12157c478bd9Sstevel@tonic-gate */ 12167c478bd9Sstevel@tonic-gate if (p->p_ldt != NULL && 1217*ddece0baSsethg ldt_rewrite_syscall(rp, p, X86_SEP)) 1218*ddece0baSsethg goto out; 1219*ddece0baSsethg 12207c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 12217c478bd9Sstevel@tonic-gate 12227c478bd9Sstevel@tonic-gate case T_BOUNDFLT + USER: /* bound fault */ 12237c478bd9Sstevel@tonic-gate case T_STKFLT + USER: /* stack fault */ 12247c478bd9Sstevel@tonic-gate case T_TSSFLT + USER: /* invalid TSS fault */ 12257c478bd9Sstevel@tonic-gate if (tudebug) 12267c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 12277c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGSEGV; 12287c478bd9Sstevel@tonic-gate siginfo.si_code = SEGV_MAPERR; 12297c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 12307c478bd9Sstevel@tonic-gate fault = FLTBOUNDS; 12317c478bd9Sstevel@tonic-gate break; 12327c478bd9Sstevel@tonic-gate 12337c478bd9Sstevel@tonic-gate case T_ALIGNMENT + USER: /* user alignment error (486) */ 12347c478bd9Sstevel@tonic-gate if (tudebug) 12357c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 12367c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 12377c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGBUS; 12387c478bd9Sstevel@tonic-gate siginfo.si_code = BUS_ADRALN; 12397c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 12407c478bd9Sstevel@tonic-gate fault = FLTACCESS; 12417c478bd9Sstevel@tonic-gate break; 12427c478bd9Sstevel@tonic-gate 12437c478bd9Sstevel@tonic-gate case T_SGLSTP + USER: /* single step/hw breakpoint exception */ 12447c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 12457c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 12467c478bd9Sstevel@tonic-gate 12477c478bd9Sstevel@tonic-gate /* Was it single-stepping? */ 12487c478bd9Sstevel@tonic-gate if (lwp->lwp_pcb.pcb_drstat & DR_SINGLESTEP) { 12497c478bd9Sstevel@tonic-gate pcb_t *pcb = &lwp->lwp_pcb; 12507c478bd9Sstevel@tonic-gate 12517c478bd9Sstevel@tonic-gate rp->r_ps &= ~PS_T; 12527c478bd9Sstevel@tonic-gate /* 12537c478bd9Sstevel@tonic-gate * If both NORMAL_STEP and WATCH_STEP are in effect, 12549acbbeafSnn * give precedence to WATCH_STEP. If neither is set, 12557c478bd9Sstevel@tonic-gate * user must have set the PS_T bit in %efl; treat this 12567c478bd9Sstevel@tonic-gate * as NORMAL_STEP. 12577c478bd9Sstevel@tonic-gate */ 12589acbbeafSnn if ((fault = undo_watch_step(&siginfo)) == 0 && 12599acbbeafSnn ((pcb->pcb_flags & NORMAL_STEP) || 12609acbbeafSnn !(pcb->pcb_flags & WATCH_STEP))) { 12617c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 12627c478bd9Sstevel@tonic-gate siginfo.si_code = TRAP_TRACE; 12637c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 12647c478bd9Sstevel@tonic-gate fault = FLTTRACE; 12657c478bd9Sstevel@tonic-gate } 12667c478bd9Sstevel@tonic-gate pcb->pcb_flags &= ~(NORMAL_STEP|WATCH_STEP); 12677c478bd9Sstevel@tonic-gate } else { 12687c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 12697c478bd9Sstevel@tonic-gate "Unexpected INT 1 in user mode, dr6=%lx", 12707c478bd9Sstevel@tonic-gate lwp->lwp_pcb.pcb_drstat); 12717c478bd9Sstevel@tonic-gate } 12727c478bd9Sstevel@tonic-gate break; 12737c478bd9Sstevel@tonic-gate 12747c478bd9Sstevel@tonic-gate case T_BPTFLT + USER: /* breakpoint trap */ 12757c478bd9Sstevel@tonic-gate if (tudebug && tudebugbpt) 12767c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 12777c478bd9Sstevel@tonic-gate /* 12787c478bd9Sstevel@tonic-gate * int 3 (the breakpoint instruction) leaves the pc referring 12797c478bd9Sstevel@tonic-gate * to the address one byte after the breakpointed address. 12807c478bd9Sstevel@tonic-gate * If the P_PR_BPTADJ flag has been set via /proc, We adjust 12817c478bd9Sstevel@tonic-gate * it back so it refers to the breakpointed address. 12827c478bd9Sstevel@tonic-gate */ 12837c478bd9Sstevel@tonic-gate if (p->p_proc_flag & P_PR_BPTADJ) 12847c478bd9Sstevel@tonic-gate rp->r_pc--; 12857c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGTRAP; 12867c478bd9Sstevel@tonic-gate siginfo.si_code = TRAP_BRKPT; 12877c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 12887c478bd9Sstevel@tonic-gate fault = FLTBPT; 12897c478bd9Sstevel@tonic-gate break; 12907c478bd9Sstevel@tonic-gate 12917c478bd9Sstevel@tonic-gate case T_AST: 12927c478bd9Sstevel@tonic-gate /* 12937c478bd9Sstevel@tonic-gate * This occurs only after the cs register has been made to 12947c478bd9Sstevel@tonic-gate * look like a kernel selector, either through debugging or 12957c478bd9Sstevel@tonic-gate * possibly by functions like setcontext(). The thread is 12967c478bd9Sstevel@tonic-gate * about to cause a general protection fault at common_iret() 12977c478bd9Sstevel@tonic-gate * in locore. We let that happen immediately instead of 12987c478bd9Sstevel@tonic-gate * doing the T_AST processing. 12997c478bd9Sstevel@tonic-gate */ 13007c478bd9Sstevel@tonic-gate goto cleanup; 13017c478bd9Sstevel@tonic-gate 13027c478bd9Sstevel@tonic-gate case T_AST + USER: /* profiling or resched pseudo trap */ 13037c478bd9Sstevel@tonic-gate if (lwp->lwp_pcb.pcb_flags & CPC_OVERFLOW) { 13047c478bd9Sstevel@tonic-gate lwp->lwp_pcb.pcb_flags &= ~CPC_OVERFLOW; 13057c478bd9Sstevel@tonic-gate if (kcpc_overflow_ast()) { 13067c478bd9Sstevel@tonic-gate /* 13077c478bd9Sstevel@tonic-gate * Signal performance counter overflow 13087c478bd9Sstevel@tonic-gate */ 13097c478bd9Sstevel@tonic-gate if (tudebug) 13107c478bd9Sstevel@tonic-gate showregs(type, rp, (caddr_t)0); 13117c478bd9Sstevel@tonic-gate bzero(&siginfo, sizeof (siginfo)); 13127c478bd9Sstevel@tonic-gate siginfo.si_signo = SIGEMT; 13137c478bd9Sstevel@tonic-gate siginfo.si_code = EMT_CPCOVF; 13147c478bd9Sstevel@tonic-gate siginfo.si_addr = (caddr_t)rp->r_pc; 13157c478bd9Sstevel@tonic-gate fault = FLTCPCOVF; 13167c478bd9Sstevel@tonic-gate } 13177c478bd9Sstevel@tonic-gate } 13187c478bd9Sstevel@tonic-gate break; 13197c478bd9Sstevel@tonic-gate } 13207c478bd9Sstevel@tonic-gate 13217c478bd9Sstevel@tonic-gate /* 13227c478bd9Sstevel@tonic-gate * We can't get here from a system trap 13237c478bd9Sstevel@tonic-gate */ 13247c478bd9Sstevel@tonic-gate ASSERT(type & USER); 13257c478bd9Sstevel@tonic-gate 13267c478bd9Sstevel@tonic-gate if (fault) { 132710e812d4Saf /* We took a fault so abort single step. */ 132810e812d4Saf lwp->lwp_pcb.pcb_flags &= ~(NORMAL_STEP|WATCH_STEP); 13297c478bd9Sstevel@tonic-gate /* 13307c478bd9Sstevel@tonic-gate * Remember the fault and fault adddress 13317c478bd9Sstevel@tonic-gate * for real-time (SIGPROF) profiling. 13327c478bd9Sstevel@tonic-gate */ 13337c478bd9Sstevel@tonic-gate lwp->lwp_lastfault = fault; 13347c478bd9Sstevel@tonic-gate lwp->lwp_lastfaddr = siginfo.si_addr; 13357c478bd9Sstevel@tonic-gate 13367c478bd9Sstevel@tonic-gate DTRACE_PROC2(fault, int, fault, ksiginfo_t *, &siginfo); 13377c478bd9Sstevel@tonic-gate 13387c478bd9Sstevel@tonic-gate /* 13397c478bd9Sstevel@tonic-gate * If a debugger has declared this fault to be an 13407c478bd9Sstevel@tonic-gate * event of interest, stop the lwp. Otherwise just 13417c478bd9Sstevel@tonic-gate * deliver the associated signal. 13427c478bd9Sstevel@tonic-gate */ 13437c478bd9Sstevel@tonic-gate if (siginfo.si_signo != SIGKILL && 13447c478bd9Sstevel@tonic-gate prismember(&p->p_fltmask, fault) && 13457c478bd9Sstevel@tonic-gate stop_on_fault(fault, &siginfo) == 0) 13467c478bd9Sstevel@tonic-gate siginfo.si_signo = 0; 13477c478bd9Sstevel@tonic-gate } 13487c478bd9Sstevel@tonic-gate 13497c478bd9Sstevel@tonic-gate if (siginfo.si_signo) 13507c478bd9Sstevel@tonic-gate trapsig(&siginfo, (fault == FLTCPCOVF)? 0 : 1); 13517c478bd9Sstevel@tonic-gate 13527c478bd9Sstevel@tonic-gate if (lwp->lwp_oweupc) 13537c478bd9Sstevel@tonic-gate profil_tick(rp->r_pc); 13547c478bd9Sstevel@tonic-gate 1355ae115bc7Smrj if (ct->t_astflag | ct->t_sig_check) { 13567c478bd9Sstevel@tonic-gate /* 13577c478bd9Sstevel@tonic-gate * Turn off the AST flag before checking all the conditions that 13587c478bd9Sstevel@tonic-gate * may have caused an AST. This flag is on whenever a signal or 13597c478bd9Sstevel@tonic-gate * unusual condition should be handled after the next trap or 13607c478bd9Sstevel@tonic-gate * syscall. 13617c478bd9Sstevel@tonic-gate */ 1362ae115bc7Smrj astoff(ct); 1363d8aa0f5aSsudheer /* 1364d8aa0f5aSsudheer * If a single-step trap occurred on a syscall (see above) 1365d8aa0f5aSsudheer * recognize it now. Do this before checking for signals 1366d8aa0f5aSsudheer * because deferred_singlestep_trap() may generate a SIGTRAP to 1367d8aa0f5aSsudheer * the LWP or may otherwise mark the LWP to call issig(FORREAL). 1368d8aa0f5aSsudheer */ 1369d8aa0f5aSsudheer if (lwp->lwp_pcb.pcb_flags & DEBUG_PENDING) 1370d8aa0f5aSsudheer deferred_singlestep_trap((caddr_t)rp->r_pc); 1371d8aa0f5aSsudheer 1372ae115bc7Smrj ct->t_sig_check = 0; 13737c478bd9Sstevel@tonic-gate 13747c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 13757c478bd9Sstevel@tonic-gate if (curthread->t_proc_flag & TP_CHANGEBIND) { 13767c478bd9Sstevel@tonic-gate timer_lwpbind(); 13777c478bd9Sstevel@tonic-gate curthread->t_proc_flag &= ~TP_CHANGEBIND; 13787c478bd9Sstevel@tonic-gate } 13797c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 13807c478bd9Sstevel@tonic-gate 13817c478bd9Sstevel@tonic-gate /* 13827c478bd9Sstevel@tonic-gate * for kaio requests that are on the per-process poll queue, 13837c478bd9Sstevel@tonic-gate * aiop->aio_pollq, they're AIO_POLL bit is set, the kernel 13847c478bd9Sstevel@tonic-gate * should copyout their result_t to user memory. by copying 13857c478bd9Sstevel@tonic-gate * out the result_t, the user can poll on memory waiting 13867c478bd9Sstevel@tonic-gate * for the kaio request to complete. 13877c478bd9Sstevel@tonic-gate */ 13887c478bd9Sstevel@tonic-gate if (p->p_aio) 13897c478bd9Sstevel@tonic-gate aio_cleanup(0); 13907c478bd9Sstevel@tonic-gate /* 13917c478bd9Sstevel@tonic-gate * If this LWP was asked to hold, call holdlwp(), which will 13927c478bd9Sstevel@tonic-gate * stop. holdlwps() sets this up and calls pokelwps() which 13937c478bd9Sstevel@tonic-gate * sets the AST flag. 13947c478bd9Sstevel@tonic-gate * 13957c478bd9Sstevel@tonic-gate * Also check TP_EXITLWP, since this is used by fresh new LWPs 13967c478bd9Sstevel@tonic-gate * through lwp_rtt(). That flag is set if the lwp_create(2) 13977c478bd9Sstevel@tonic-gate * syscall failed after creating the LWP. 13987c478bd9Sstevel@tonic-gate */ 13997c478bd9Sstevel@tonic-gate if (ISHOLD(p)) 14007c478bd9Sstevel@tonic-gate holdlwp(); 14017c478bd9Sstevel@tonic-gate 14027c478bd9Sstevel@tonic-gate /* 14037c478bd9Sstevel@tonic-gate * All code that sets signals and makes ISSIG evaluate true must 14047c478bd9Sstevel@tonic-gate * set t_astflag afterwards. 14057c478bd9Sstevel@tonic-gate */ 1406ae115bc7Smrj if (ISSIG_PENDING(ct, lwp, p)) { 14077c478bd9Sstevel@tonic-gate if (issig(FORREAL)) 14087c478bd9Sstevel@tonic-gate psig(); 1409ae115bc7Smrj ct->t_sig_check = 1; 14107c478bd9Sstevel@tonic-gate } 14117c478bd9Sstevel@tonic-gate 1412ae115bc7Smrj if (ct->t_rprof != NULL) { 14137c478bd9Sstevel@tonic-gate realsigprof(0, 0); 1414ae115bc7Smrj ct->t_sig_check = 1; 14157c478bd9Sstevel@tonic-gate } 141665a89a64Smarx 141765a89a64Smarx /* 141865a89a64Smarx * /proc can't enable/disable the trace bit itself 141965a89a64Smarx * because that could race with the call gate used by 142065a89a64Smarx * system calls via "lcall". If that happened, an 142165a89a64Smarx * invalid EFLAGS would result. prstep()/prnostep() 142265a89a64Smarx * therefore schedule an AST for the purpose. 142365a89a64Smarx */ 142465a89a64Smarx if (lwp->lwp_pcb.pcb_flags & REQUEST_STEP) { 142565a89a64Smarx lwp->lwp_pcb.pcb_flags &= ~REQUEST_STEP; 142665a89a64Smarx rp->r_ps |= PS_T; 142765a89a64Smarx } 142865a89a64Smarx if (lwp->lwp_pcb.pcb_flags & REQUEST_NOSTEP) { 142965a89a64Smarx lwp->lwp_pcb.pcb_flags &= ~REQUEST_NOSTEP; 143065a89a64Smarx rp->r_ps &= ~PS_T; 143165a89a64Smarx } 14327c478bd9Sstevel@tonic-gate } 14337c478bd9Sstevel@tonic-gate 14347c478bd9Sstevel@tonic-gate out: /* We can't get here from a system trap */ 14357c478bd9Sstevel@tonic-gate ASSERT(type & USER); 14367c478bd9Sstevel@tonic-gate 14377c478bd9Sstevel@tonic-gate if (ISHOLD(p)) 14387c478bd9Sstevel@tonic-gate holdlwp(); 14397c478bd9Sstevel@tonic-gate 14407c478bd9Sstevel@tonic-gate /* 14417c478bd9Sstevel@tonic-gate * Set state to LWP_USER here so preempt won't give us a kernel 14427c478bd9Sstevel@tonic-gate * priority if it occurs after this point. Call CL_TRAPRET() to 14437c478bd9Sstevel@tonic-gate * restore the user-level priority. 14447c478bd9Sstevel@tonic-gate * 14457c478bd9Sstevel@tonic-gate * It is important that no locks (other than spinlocks) be entered 14467c478bd9Sstevel@tonic-gate * after this point before returning to user mode (unless lwp_state 14477c478bd9Sstevel@tonic-gate * is set back to LWP_SYS). 14487c478bd9Sstevel@tonic-gate */ 14497c478bd9Sstevel@tonic-gate lwp->lwp_state = LWP_USER; 14507c478bd9Sstevel@tonic-gate 1451ae115bc7Smrj if (ct->t_trapret) { 1452ae115bc7Smrj ct->t_trapret = 0; 1453ae115bc7Smrj thread_lock(ct); 1454ae115bc7Smrj CL_TRAPRET(ct); 1455ae115bc7Smrj thread_unlock(ct); 14567c478bd9Sstevel@tonic-gate } 1457c97ad5cdSakolb if (CPU->cpu_runrun || curthread->t_schedflag & TS_ANYWAITQ) 14587c478bd9Sstevel@tonic-gate preempt(); 1459ae115bc7Smrj (void) new_mstate(ct, mstate); 14607c478bd9Sstevel@tonic-gate 14617c478bd9Sstevel@tonic-gate /* Kernel probe */ 14627c478bd9Sstevel@tonic-gate TNF_PROBE_1(thread_state, "thread", /* CSTYLED */, 14637c478bd9Sstevel@tonic-gate tnf_microstate, state, LMS_USER); 14647c478bd9Sstevel@tonic-gate 14657c478bd9Sstevel@tonic-gate return; 14667c478bd9Sstevel@tonic-gate 14677c478bd9Sstevel@tonic-gate cleanup: /* system traps end up here */ 14687c478bd9Sstevel@tonic-gate ASSERT(!(type & USER)); 14697c478bd9Sstevel@tonic-gate } 14707c478bd9Sstevel@tonic-gate 14717c478bd9Sstevel@tonic-gate /* 14727c478bd9Sstevel@tonic-gate * Patch non-zero to disable preemption of threads in the kernel. 14737c478bd9Sstevel@tonic-gate */ 14747c478bd9Sstevel@tonic-gate int IGNORE_KERNEL_PREEMPTION = 0; /* XXX - delete this someday */ 14757c478bd9Sstevel@tonic-gate 14767c478bd9Sstevel@tonic-gate struct kpreempt_cnts { /* kernel preemption statistics */ 14777c478bd9Sstevel@tonic-gate int kpc_idle; /* executing idle thread */ 14787c478bd9Sstevel@tonic-gate int kpc_intr; /* executing interrupt thread */ 14797c478bd9Sstevel@tonic-gate int kpc_clock; /* executing clock thread */ 14807c478bd9Sstevel@tonic-gate int kpc_blocked; /* thread has blocked preemption (t_preempt) */ 14817c478bd9Sstevel@tonic-gate int kpc_notonproc; /* thread is surrendering processor */ 14827c478bd9Sstevel@tonic-gate int kpc_inswtch; /* thread has ratified scheduling decision */ 14837c478bd9Sstevel@tonic-gate int kpc_prilevel; /* processor interrupt level is too high */ 14847c478bd9Sstevel@tonic-gate int kpc_apreempt; /* asynchronous preemption */ 14857c478bd9Sstevel@tonic-gate int kpc_spreempt; /* synchronous preemption */ 14867c478bd9Sstevel@tonic-gate } kpreempt_cnts; 14877c478bd9Sstevel@tonic-gate 14887c478bd9Sstevel@tonic-gate /* 14897c478bd9Sstevel@tonic-gate * kernel preemption: forced rescheduling, preempt the running kernel thread. 14907c478bd9Sstevel@tonic-gate * the argument is old PIL for an interrupt, 14917c478bd9Sstevel@tonic-gate * or the distingished value KPREEMPT_SYNC. 14927c478bd9Sstevel@tonic-gate */ 14937c478bd9Sstevel@tonic-gate void 14947c478bd9Sstevel@tonic-gate kpreempt(int asyncspl) 14957c478bd9Sstevel@tonic-gate { 1496ae115bc7Smrj kthread_t *ct = curthread; 14977c478bd9Sstevel@tonic-gate 14987c478bd9Sstevel@tonic-gate if (IGNORE_KERNEL_PREEMPTION) { 14997c478bd9Sstevel@tonic-gate aston(CPU->cpu_dispthread); 15007c478bd9Sstevel@tonic-gate return; 15017c478bd9Sstevel@tonic-gate } 15027c478bd9Sstevel@tonic-gate 15037c478bd9Sstevel@tonic-gate /* 15047c478bd9Sstevel@tonic-gate * Check that conditions are right for kernel preemption 15057c478bd9Sstevel@tonic-gate */ 15067c478bd9Sstevel@tonic-gate do { 1507ae115bc7Smrj if (ct->t_preempt) { 15087c478bd9Sstevel@tonic-gate /* 15097c478bd9Sstevel@tonic-gate * either a privileged thread (idle, panic, interrupt) 15107c478bd9Sstevel@tonic-gate * or will check when t_preempt is lowered 15117c478bd9Sstevel@tonic-gate */ 1512ae115bc7Smrj if (ct->t_pri < 0) 15137c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_idle++; 1514ae115bc7Smrj else if (ct->t_flag & T_INTR_THREAD) { 15157c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_intr++; 1516ae115bc7Smrj if (ct->t_pil == CLOCK_LEVEL) 15177c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_clock++; 15187c478bd9Sstevel@tonic-gate } else 15197c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_blocked++; 15207c478bd9Sstevel@tonic-gate aston(CPU->cpu_dispthread); 15217c478bd9Sstevel@tonic-gate return; 15227c478bd9Sstevel@tonic-gate } 1523ae115bc7Smrj if (ct->t_state != TS_ONPROC || 1524ae115bc7Smrj ct->t_disp_queue != CPU->cpu_disp) { 15257c478bd9Sstevel@tonic-gate /* this thread will be calling swtch() shortly */ 15267c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_notonproc++; 15277c478bd9Sstevel@tonic-gate if (CPU->cpu_thread != CPU->cpu_dispthread) { 15287c478bd9Sstevel@tonic-gate /* already in swtch(), force another */ 15297c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_inswtch++; 15307c478bd9Sstevel@tonic-gate siron(); 15317c478bd9Sstevel@tonic-gate } 15327c478bd9Sstevel@tonic-gate return; 15337c478bd9Sstevel@tonic-gate } 15347c478bd9Sstevel@tonic-gate if (getpil() >= DISP_LEVEL) { 15357c478bd9Sstevel@tonic-gate /* 15367c478bd9Sstevel@tonic-gate * We can't preempt this thread if it is at 15377c478bd9Sstevel@tonic-gate * a PIL >= DISP_LEVEL since it may be holding 15387c478bd9Sstevel@tonic-gate * a spin lock (like sched_lock). 15397c478bd9Sstevel@tonic-gate */ 15407c478bd9Sstevel@tonic-gate siron(); /* check back later */ 15417c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_prilevel++; 15427c478bd9Sstevel@tonic-gate return; 15437c478bd9Sstevel@tonic-gate } 1544ae115bc7Smrj if (!interrupts_enabled()) { 1545ae115bc7Smrj /* 1546ae115bc7Smrj * Can't preempt while running with ints disabled 1547ae115bc7Smrj */ 1548ae115bc7Smrj kpreempt_cnts.kpc_prilevel++; 1549ae115bc7Smrj return; 1550ae115bc7Smrj } 15517c478bd9Sstevel@tonic-gate if (asyncspl != KPREEMPT_SYNC) 15527c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_apreempt++; 15537c478bd9Sstevel@tonic-gate else 15547c478bd9Sstevel@tonic-gate kpreempt_cnts.kpc_spreempt++; 15557c478bd9Sstevel@tonic-gate 1556ae115bc7Smrj ct->t_preempt++; 15577c478bd9Sstevel@tonic-gate preempt(); 1558ae115bc7Smrj ct->t_preempt--; 15597c478bd9Sstevel@tonic-gate } while (CPU->cpu_kprunrun); 15607c478bd9Sstevel@tonic-gate } 15617c478bd9Sstevel@tonic-gate 15627c478bd9Sstevel@tonic-gate /* 15637c478bd9Sstevel@tonic-gate * Print out debugging info. 15647c478bd9Sstevel@tonic-gate */ 15657c478bd9Sstevel@tonic-gate static void 15667c478bd9Sstevel@tonic-gate showregs(uint_t type, struct regs *rp, caddr_t addr) 15677c478bd9Sstevel@tonic-gate { 15687c478bd9Sstevel@tonic-gate int s; 15697c478bd9Sstevel@tonic-gate 15707c478bd9Sstevel@tonic-gate s = spl7(); 15717c478bd9Sstevel@tonic-gate type &= ~USER; 1572ae115bc7Smrj if (PTOU(curproc)->u_comm[0]) 1573ae115bc7Smrj printf("%s: ", PTOU(curproc)->u_comm); 15747c478bd9Sstevel@tonic-gate if (type < TRAP_TYPES) 15757c478bd9Sstevel@tonic-gate printf("#%s %s\n", trap_type_mnemonic[type], trap_type[type]); 15767c478bd9Sstevel@tonic-gate else 15777c478bd9Sstevel@tonic-gate switch (type) { 15787c478bd9Sstevel@tonic-gate case T_SYSCALL: 15797c478bd9Sstevel@tonic-gate printf("Syscall Trap:\n"); 15807c478bd9Sstevel@tonic-gate break; 15817c478bd9Sstevel@tonic-gate case T_AST: 15827c478bd9Sstevel@tonic-gate printf("AST\n"); 15837c478bd9Sstevel@tonic-gate break; 15847c478bd9Sstevel@tonic-gate default: 15857c478bd9Sstevel@tonic-gate printf("Bad Trap = %d\n", type); 15867c478bd9Sstevel@tonic-gate break; 15877c478bd9Sstevel@tonic-gate } 15887c478bd9Sstevel@tonic-gate if (type == T_PGFLT) { 15897c478bd9Sstevel@tonic-gate printf("Bad %s fault at addr=0x%lx\n", 15907c478bd9Sstevel@tonic-gate USERMODE(rp->r_cs) ? "user": "kernel", (uintptr_t)addr); 15917c478bd9Sstevel@tonic-gate } else if (addr) { 15927c478bd9Sstevel@tonic-gate printf("addr=0x%lx\n", (uintptr_t)addr); 15937c478bd9Sstevel@tonic-gate } 15947c478bd9Sstevel@tonic-gate 15957c478bd9Sstevel@tonic-gate printf("pid=%d, pc=0x%lx, sp=0x%lx, eflags=0x%lx\n", 15967c478bd9Sstevel@tonic-gate (ttoproc(curthread) && ttoproc(curthread)->p_pidp) ? 15977c478bd9Sstevel@tonic-gate ttoproc(curthread)->p_pid : 0, rp->r_pc, rp->r_sp, rp->r_ps); 15987c478bd9Sstevel@tonic-gate 15997c478bd9Sstevel@tonic-gate #if defined(__lint) 16007c478bd9Sstevel@tonic-gate /* 16017c478bd9Sstevel@tonic-gate * this clause can be deleted when lint bug 4870403 is fixed 16027c478bd9Sstevel@tonic-gate * (lint thinks that bit 32 is illegal in a %b format string) 16037c478bd9Sstevel@tonic-gate */ 16047c478bd9Sstevel@tonic-gate printf("cr0: %x cr4: %b\n", 16057c478bd9Sstevel@tonic-gate (uint_t)getcr0(), (uint_t)getcr4(), FMT_CR4); 16067c478bd9Sstevel@tonic-gate #else 16077c478bd9Sstevel@tonic-gate printf("cr0: %b cr4: %b\n", 16087c478bd9Sstevel@tonic-gate (uint_t)getcr0(), FMT_CR0, (uint_t)getcr4(), FMT_CR4); 1609ae115bc7Smrj #endif /* __lint */ 16107c478bd9Sstevel@tonic-gate 16117c478bd9Sstevel@tonic-gate #if defined(__amd64) 16127c478bd9Sstevel@tonic-gate printf("cr2: %lx cr3: %lx cr8: %lx\n", getcr2(), getcr3(), getcr8()); 16137c478bd9Sstevel@tonic-gate #elif defined(__i386) 16147c478bd9Sstevel@tonic-gate printf("cr2: %lx cr3: %lx\n", getcr2(), getcr3()); 16157c478bd9Sstevel@tonic-gate #endif 16167c478bd9Sstevel@tonic-gate 16177c478bd9Sstevel@tonic-gate dumpregs(rp); 16187c478bd9Sstevel@tonic-gate splx(s); 16197c478bd9Sstevel@tonic-gate } 16207c478bd9Sstevel@tonic-gate 16217c478bd9Sstevel@tonic-gate static void 16227c478bd9Sstevel@tonic-gate dumpregs(struct regs *rp) 16237c478bd9Sstevel@tonic-gate { 16247c478bd9Sstevel@tonic-gate #if defined(__amd64) 16257c478bd9Sstevel@tonic-gate const char fmt[] = "\t%3s: %16lx %3s: %16lx %3s: %16lx\n"; 16267c478bd9Sstevel@tonic-gate 16277c478bd9Sstevel@tonic-gate printf(fmt, "rdi", rp->r_rdi, "rsi", rp->r_rsi, "rdx", rp->r_rdx); 16287c478bd9Sstevel@tonic-gate printf(fmt, "rcx", rp->r_rcx, " r8", rp->r_r8, " r9", rp->r_r9); 16297c478bd9Sstevel@tonic-gate printf(fmt, "rax", rp->r_rax, "rbx", rp->r_rbx, "rbp", rp->r_rbp); 16307c478bd9Sstevel@tonic-gate printf(fmt, "r10", rp->r_r10, "r11", rp->r_r11, "r12", rp->r_r12); 16317c478bd9Sstevel@tonic-gate printf(fmt, "r13", rp->r_r13, "r14", rp->r_r14, "r15", rp->r_r15); 16327c478bd9Sstevel@tonic-gate 1633ae115bc7Smrj printf(fmt, "fsb", rdmsr(MSR_AMD_FSBASE), "gsb", rdmsr(MSR_AMD_GSBASE), 1634ae115bc7Smrj " ds", rp->r_ds); 16357c478bd9Sstevel@tonic-gate printf(fmt, " es", rp->r_es, " fs", rp->r_fs, " gs", rp->r_gs); 16367c478bd9Sstevel@tonic-gate 16377c478bd9Sstevel@tonic-gate printf(fmt, "trp", rp->r_trapno, "err", rp->r_err, "rip", rp->r_rip); 16387c478bd9Sstevel@tonic-gate printf(fmt, " cs", rp->r_cs, "rfl", rp->r_rfl, "rsp", rp->r_rsp); 16397c478bd9Sstevel@tonic-gate 16407c478bd9Sstevel@tonic-gate printf("\t%3s: %16lx\n", " ss", rp->r_ss); 16417c478bd9Sstevel@tonic-gate 16427c478bd9Sstevel@tonic-gate #elif defined(__i386) 16437c478bd9Sstevel@tonic-gate const char fmt[] = "\t%3s: %8lx %3s: %8lx %3s: %8lx %3s: %8lx\n"; 16447c478bd9Sstevel@tonic-gate 16457c478bd9Sstevel@tonic-gate printf(fmt, " gs", rp->r_gs, " fs", rp->r_fs, 16467c478bd9Sstevel@tonic-gate " es", rp->r_es, " ds", rp->r_ds); 16477c478bd9Sstevel@tonic-gate printf(fmt, "edi", rp->r_edi, "esi", rp->r_esi, 16487c478bd9Sstevel@tonic-gate "ebp", rp->r_ebp, "esp", rp->r_esp); 16497c478bd9Sstevel@tonic-gate printf(fmt, "ebx", rp->r_ebx, "edx", rp->r_edx, 16507c478bd9Sstevel@tonic-gate "ecx", rp->r_ecx, "eax", rp->r_eax); 16517c478bd9Sstevel@tonic-gate printf(fmt, "trp", rp->r_trapno, "err", rp->r_err, 16527c478bd9Sstevel@tonic-gate "eip", rp->r_eip, " cs", rp->r_cs); 16537c478bd9Sstevel@tonic-gate printf("\t%3s: %8lx %3s: %8lx %3s: %8lx\n", 16547c478bd9Sstevel@tonic-gate "efl", rp->r_efl, "usp", rp->r_uesp, " ss", rp->r_ss); 16557c478bd9Sstevel@tonic-gate 16567c478bd9Sstevel@tonic-gate #endif /* __i386 */ 16577c478bd9Sstevel@tonic-gate } 16587c478bd9Sstevel@tonic-gate 16597c478bd9Sstevel@tonic-gate /* 16607c478bd9Sstevel@tonic-gate * Handle #gp faults in kernel mode. 16617c478bd9Sstevel@tonic-gate * 16627c478bd9Sstevel@tonic-gate * One legitimate way this can happen is if we attempt to update segment 16637c478bd9Sstevel@tonic-gate * registers to naughty values on the way out of the kernel. 16647c478bd9Sstevel@tonic-gate * 16657c478bd9Sstevel@tonic-gate * This can happen in a couple of ways: someone - either accidentally or 16667c478bd9Sstevel@tonic-gate * on purpose - creates (setcontext(2), lwp_create(2)) or modifies 16677c478bd9Sstevel@tonic-gate * (signal(2)) a ucontext that contains silly segment register values. 16687c478bd9Sstevel@tonic-gate * Or someone - either accidentally or on purpose - modifies the prgregset_t 16697c478bd9Sstevel@tonic-gate * of a subject process via /proc to contain silly segment register values. 16707c478bd9Sstevel@tonic-gate * 16717c478bd9Sstevel@tonic-gate * (The unfortunate part is that we can end up discovering the bad segment 16727c478bd9Sstevel@tonic-gate * register value in the middle of an 'iret' after we've popped most of the 16737c478bd9Sstevel@tonic-gate * stack. So it becomes quite difficult to associate an accurate ucontext 16747c478bd9Sstevel@tonic-gate * with the lwp, because the act of taking the #gp trap overwrites most of 16757c478bd9Sstevel@tonic-gate * what we were going to send the lwp.) 16767c478bd9Sstevel@tonic-gate * 16777c478bd9Sstevel@tonic-gate * OTOH if it turns out that's -not- the problem, and we're -not- an lwp 16787c478bd9Sstevel@tonic-gate * trying to return to user mode and we get a #gp fault, then we need 16797c478bd9Sstevel@tonic-gate * to die() -- which will happen if we return non-zero from this routine. 16807c478bd9Sstevel@tonic-gate */ 16817c478bd9Sstevel@tonic-gate static int 16827c478bd9Sstevel@tonic-gate kern_gpfault(struct regs *rp) 16837c478bd9Sstevel@tonic-gate { 16847c478bd9Sstevel@tonic-gate kthread_t *t = curthread; 16857c478bd9Sstevel@tonic-gate proc_t *p = ttoproc(t); 16867c478bd9Sstevel@tonic-gate klwp_t *lwp = ttolwp(t); 16877c478bd9Sstevel@tonic-gate struct regs tmpregs, *trp = NULL; 16887c478bd9Sstevel@tonic-gate caddr_t pc = (caddr_t)rp->r_pc; 16897c478bd9Sstevel@tonic-gate int v; 16907c478bd9Sstevel@tonic-gate 16917c478bd9Sstevel@tonic-gate extern void _sys_rtt(), sr_sup(); 16927c478bd9Sstevel@tonic-gate 16937c478bd9Sstevel@tonic-gate #if defined(__amd64) 16947c478bd9Sstevel@tonic-gate static const uint8_t iretq_insn[2] = { 0x48, 0xcf }; 16957c478bd9Sstevel@tonic-gate 16967c478bd9Sstevel@tonic-gate #elif defined(__i386) 16977c478bd9Sstevel@tonic-gate static const uint8_t iret_insn[1] = { 0xcf }; 16987c478bd9Sstevel@tonic-gate 16997c478bd9Sstevel@tonic-gate /* 17007c478bd9Sstevel@tonic-gate * Note carefully the appallingly awful dependency between 17017c478bd9Sstevel@tonic-gate * the instruction sequence used in __SEGREGS_POP and these 17027c478bd9Sstevel@tonic-gate * instructions encoded here. 17037c478bd9Sstevel@tonic-gate * 17047c478bd9Sstevel@tonic-gate * XX64 Add some commentary to locore.s/privregs.h to document this. 17057c478bd9Sstevel@tonic-gate */ 17067c478bd9Sstevel@tonic-gate static const uint8_t movw_0_esp_gs[4] = { 0x8e, 0x6c, 0x24, 0x0 }; 17077c478bd9Sstevel@tonic-gate static const uint8_t movw_4_esp_fs[4] = { 0x8e, 0x64, 0x24, 0x4 }; 17087c478bd9Sstevel@tonic-gate static const uint8_t movw_8_esp_es[4] = { 0x8e, 0x44, 0x24, 0x8 }; 17097c478bd9Sstevel@tonic-gate static const uint8_t movw_c_esp_ds[4] = { 0x8e, 0x5c, 0x24, 0xc }; 17107c478bd9Sstevel@tonic-gate #endif 17117c478bd9Sstevel@tonic-gate /* 17127c478bd9Sstevel@tonic-gate * if we're not an lwp, or the pc range is outside _sys_rtt, then 17137c478bd9Sstevel@tonic-gate * we should immediately be die()ing horribly 17147c478bd9Sstevel@tonic-gate */ 17157c478bd9Sstevel@tonic-gate if (lwp == NULL || 17167c478bd9Sstevel@tonic-gate (uintptr_t)pc < (uintptr_t)_sys_rtt || 17177c478bd9Sstevel@tonic-gate (uintptr_t)pc > (uintptr_t)sr_sup) 17187c478bd9Sstevel@tonic-gate return (1); 17197c478bd9Sstevel@tonic-gate 17207c478bd9Sstevel@tonic-gate /* 17217c478bd9Sstevel@tonic-gate * So at least we're in the right part of the kernel. 17227c478bd9Sstevel@tonic-gate * 17237c478bd9Sstevel@tonic-gate * Disassemble the instruction at the faulting pc. 17247c478bd9Sstevel@tonic-gate * Once we know what it is, we carefully reconstruct the stack 17257c478bd9Sstevel@tonic-gate * based on the order in which the stack is deconstructed in 17267c478bd9Sstevel@tonic-gate * _sys_rtt. Ew. 17277c478bd9Sstevel@tonic-gate */ 17287c478bd9Sstevel@tonic-gate 17297c478bd9Sstevel@tonic-gate #if defined(__amd64) 17307c478bd9Sstevel@tonic-gate 17317c478bd9Sstevel@tonic-gate if (bcmp(pc, iretq_insn, sizeof (iretq_insn)) == 0) { 17327c478bd9Sstevel@tonic-gate /* 17337c478bd9Sstevel@tonic-gate * We took the #gp while trying to perform the iretq. 17347c478bd9Sstevel@tonic-gate * This means that either %cs or %ss are bad. 17357c478bd9Sstevel@tonic-gate * All we know for sure is that most of the general 17367c478bd9Sstevel@tonic-gate * registers have been restored, including the 17377c478bd9Sstevel@tonic-gate * segment registers, and all we have left on the 17387c478bd9Sstevel@tonic-gate * topmost part of the lwp's stack are the 17397c478bd9Sstevel@tonic-gate * registers that the iretq was unable to consume. 17407c478bd9Sstevel@tonic-gate * 17417c478bd9Sstevel@tonic-gate * All the rest of the state was crushed by the #gp 17427c478bd9Sstevel@tonic-gate * which pushed -its- registers atop our old save area 17437c478bd9Sstevel@tonic-gate * (because we had to decrement the stack pointer, sigh) so 17447c478bd9Sstevel@tonic-gate * all that we can try and do is to reconstruct the 17457c478bd9Sstevel@tonic-gate * crushed frame from the #gp trap frame itself. 17467c478bd9Sstevel@tonic-gate */ 17477c478bd9Sstevel@tonic-gate trp = &tmpregs; 17487c478bd9Sstevel@tonic-gate trp->r_ss = lwptoregs(lwp)->r_ss; 17497c478bd9Sstevel@tonic-gate trp->r_sp = lwptoregs(lwp)->r_sp; 17507c478bd9Sstevel@tonic-gate trp->r_ps = lwptoregs(lwp)->r_ps; 17517c478bd9Sstevel@tonic-gate trp->r_cs = lwptoregs(lwp)->r_cs; 17527c478bd9Sstevel@tonic-gate trp->r_pc = lwptoregs(lwp)->r_pc; 17537c478bd9Sstevel@tonic-gate bcopy(rp, trp, offsetof(struct regs, r_pc)); 17547c478bd9Sstevel@tonic-gate 17557c478bd9Sstevel@tonic-gate /* 17567c478bd9Sstevel@tonic-gate * Validate simple math 17577c478bd9Sstevel@tonic-gate */ 17587c478bd9Sstevel@tonic-gate ASSERT(trp->r_pc == lwptoregs(lwp)->r_pc); 17597c478bd9Sstevel@tonic-gate ASSERT(trp->r_err == rp->r_err); 17607c478bd9Sstevel@tonic-gate 17617c478bd9Sstevel@tonic-gate } 17627c478bd9Sstevel@tonic-gate 17637c478bd9Sstevel@tonic-gate #elif defined(__i386) 17647c478bd9Sstevel@tonic-gate 17657c478bd9Sstevel@tonic-gate if (bcmp(pc, iret_insn, sizeof (iret_insn)) == 0) { 17667c478bd9Sstevel@tonic-gate /* 17677c478bd9Sstevel@tonic-gate * We took the #gp while trying to perform the iret. 17687c478bd9Sstevel@tonic-gate * This means that either %cs or %ss are bad. 17697c478bd9Sstevel@tonic-gate * All we know for sure is that most of the general 17707c478bd9Sstevel@tonic-gate * registers have been restored, including the 17717c478bd9Sstevel@tonic-gate * segment registers, and all we have left on the 17727c478bd9Sstevel@tonic-gate * topmost part of the lwp's stack are the registers that 17737c478bd9Sstevel@tonic-gate * the iret was unable to consume. 17747c478bd9Sstevel@tonic-gate * 17757c478bd9Sstevel@tonic-gate * All the rest of the state was crushed by the #gp 17767c478bd9Sstevel@tonic-gate * which pushed -its- registers atop our old save area 17777c478bd9Sstevel@tonic-gate * (because we had to decrement the stack pointer, sigh) so 17787c478bd9Sstevel@tonic-gate * all that we can try and do is to reconstruct the 17797c478bd9Sstevel@tonic-gate * crushed frame from the #gp trap frame itself. 17807c478bd9Sstevel@tonic-gate */ 17817c478bd9Sstevel@tonic-gate trp = &tmpregs; 17827c478bd9Sstevel@tonic-gate trp->r_ss = lwptoregs(lwp)->r_ss; 17837c478bd9Sstevel@tonic-gate trp->r_sp = lwptoregs(lwp)->r_sp; 17847c478bd9Sstevel@tonic-gate trp->r_ps = lwptoregs(lwp)->r_ps; 17857c478bd9Sstevel@tonic-gate trp->r_cs = lwptoregs(lwp)->r_cs; 17867c478bd9Sstevel@tonic-gate trp->r_pc = lwptoregs(lwp)->r_pc; 17877c478bd9Sstevel@tonic-gate bcopy(rp, trp, offsetof(struct regs, r_pc)); 17887c478bd9Sstevel@tonic-gate 17897c478bd9Sstevel@tonic-gate ASSERT(trp->r_pc == lwptoregs(lwp)->r_pc); 17907c478bd9Sstevel@tonic-gate ASSERT(trp->r_err == rp->r_err); 17917c478bd9Sstevel@tonic-gate 17927c478bd9Sstevel@tonic-gate } else { 17937c478bd9Sstevel@tonic-gate /* 17947c478bd9Sstevel@tonic-gate * Segment registers are reloaded in _sys_rtt 17957c478bd9Sstevel@tonic-gate * via the following sequence: 17967c478bd9Sstevel@tonic-gate * 17977c478bd9Sstevel@tonic-gate * movw 0(%esp), %gs 17987c478bd9Sstevel@tonic-gate * movw 4(%esp), %fs 17997c478bd9Sstevel@tonic-gate * movw 8(%esp), %es 18007c478bd9Sstevel@tonic-gate * movw 12(%esp), %ds 18017c478bd9Sstevel@tonic-gate * addl $16, %esp 18027c478bd9Sstevel@tonic-gate * 18037c478bd9Sstevel@tonic-gate * Thus if any of them fault, we know the user 18047c478bd9Sstevel@tonic-gate * registers are left unharmed on the stack. 18057c478bd9Sstevel@tonic-gate */ 18067c478bd9Sstevel@tonic-gate if (bcmp(pc, movw_0_esp_gs, sizeof (movw_0_esp_gs)) == 0 || 18077c478bd9Sstevel@tonic-gate bcmp(pc, movw_4_esp_fs, sizeof (movw_4_esp_fs)) == 0 || 18087c478bd9Sstevel@tonic-gate bcmp(pc, movw_8_esp_es, sizeof (movw_8_esp_es)) == 0 || 18097c478bd9Sstevel@tonic-gate bcmp(pc, movw_c_esp_ds, sizeof (movw_c_esp_ds)) == 0) 18107c478bd9Sstevel@tonic-gate trp = lwptoregs(lwp); 18117c478bd9Sstevel@tonic-gate } 18127c478bd9Sstevel@tonic-gate #endif /* __amd64 */ 18137c478bd9Sstevel@tonic-gate 18147c478bd9Sstevel@tonic-gate if (trp == NULL) 18157c478bd9Sstevel@tonic-gate return (1); 18167c478bd9Sstevel@tonic-gate 18177c478bd9Sstevel@tonic-gate /* 18187c478bd9Sstevel@tonic-gate * If we get to here, we're reasonably confident that we've 18197c478bd9Sstevel@tonic-gate * correctly decoded what happened on the way out of the kernel. 18207c478bd9Sstevel@tonic-gate * Rewrite the lwp's registers so that we can create a core dump 18217c478bd9Sstevel@tonic-gate * the (at least vaguely) represents the mcontext we were 18227c478bd9Sstevel@tonic-gate * being asked to restore when things went so terribly wrong. 18237c478bd9Sstevel@tonic-gate */ 18247c478bd9Sstevel@tonic-gate 18257c478bd9Sstevel@tonic-gate /* 18267c478bd9Sstevel@tonic-gate * Make sure that we have a meaningful %trapno and %err. 18277c478bd9Sstevel@tonic-gate */ 18287c478bd9Sstevel@tonic-gate trp->r_trapno = rp->r_trapno; 18297c478bd9Sstevel@tonic-gate trp->r_err = rp->r_err; 18307c478bd9Sstevel@tonic-gate 18317c478bd9Sstevel@tonic-gate if ((caddr_t)trp != (caddr_t)lwptoregs(lwp)) 18327c478bd9Sstevel@tonic-gate bcopy(trp, lwptoregs(lwp), sizeof (*trp)); 18337c478bd9Sstevel@tonic-gate 18347c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 18357c478bd9Sstevel@tonic-gate lwp->lwp_cursig = SIGSEGV; 18367c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 18377c478bd9Sstevel@tonic-gate 18387c478bd9Sstevel@tonic-gate /* 18397c478bd9Sstevel@tonic-gate * Terminate all LWPs but don't discard them. If another lwp beat us to 18407c478bd9Sstevel@tonic-gate * the punch by calling exit(), evaporate now. 18417c478bd9Sstevel@tonic-gate */ 184297eda132Sraf proc_is_exiting(p); 18437c478bd9Sstevel@tonic-gate if (exitlwps(1) != 0) { 18447c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 18457c478bd9Sstevel@tonic-gate lwp_exit(); 18467c478bd9Sstevel@tonic-gate } 18477c478bd9Sstevel@tonic-gate 18487c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 18497c478bd9Sstevel@tonic-gate if (audit_active) /* audit core dump */ 18507c478bd9Sstevel@tonic-gate audit_core_start(SIGSEGV); 18517c478bd9Sstevel@tonic-gate #endif 18527c478bd9Sstevel@tonic-gate v = core(SIGSEGV, B_FALSE); 18537c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 18547c478bd9Sstevel@tonic-gate if (audit_active) /* audit core dump */ 18557c478bd9Sstevel@tonic-gate audit_core_finish(v ? CLD_KILLED : CLD_DUMPED); 18567c478bd9Sstevel@tonic-gate #endif 18577c478bd9Sstevel@tonic-gate exit(v ? CLD_KILLED : CLD_DUMPED, SIGSEGV); 18587c478bd9Sstevel@tonic-gate return (0); 18597c478bd9Sstevel@tonic-gate } 18607c478bd9Sstevel@tonic-gate 18617c478bd9Sstevel@tonic-gate /* 18627c478bd9Sstevel@tonic-gate * dump_tss() - Display the TSS structure 18637c478bd9Sstevel@tonic-gate */ 18647c478bd9Sstevel@tonic-gate 18657c478bd9Sstevel@tonic-gate #if defined(__amd64) 18667c478bd9Sstevel@tonic-gate 18677c478bd9Sstevel@tonic-gate static void 18687c478bd9Sstevel@tonic-gate dump_tss(void) 18697c478bd9Sstevel@tonic-gate { 18707c478bd9Sstevel@tonic-gate const char tss_fmt[] = "tss.%s:\t0x%p\n"; /* Format string */ 18717c478bd9Sstevel@tonic-gate struct tss *tss = CPU->cpu_tss; 18727c478bd9Sstevel@tonic-gate 18737c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp0", (void *)tss->tss_rsp0); 18747c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp1", (void *)tss->tss_rsp1); 18757c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_rsp2", (void *)tss->tss_rsp2); 18767c478bd9Sstevel@tonic-gate 18777c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist1", (void *)tss->tss_ist1); 18787c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist2", (void *)tss->tss_ist2); 18797c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist3", (void *)tss->tss_ist3); 18807c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist4", (void *)tss->tss_ist4); 18817c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist5", (void *)tss->tss_ist5); 18827c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist6", (void *)tss->tss_ist6); 18837c478bd9Sstevel@tonic-gate printf(tss_fmt, "tss_ist7", (void *)tss->tss_ist7); 18847c478bd9Sstevel@tonic-gate } 18857c478bd9Sstevel@tonic-gate 18867c478bd9Sstevel@tonic-gate #elif defined(__i386) 18877c478bd9Sstevel@tonic-gate 18887c478bd9Sstevel@tonic-gate static void 18897c478bd9Sstevel@tonic-gate dump_tss(void) 18907c478bd9Sstevel@tonic-gate { 18917c478bd9Sstevel@tonic-gate const char tss_fmt[] = "tss.%s:\t0x%p\n"; /* Format string */ 18927c478bd9Sstevel@tonic-gate struct tss *tss = CPU->cpu_tss; 18937c478bd9Sstevel@tonic-gate 18943dfcd6dcSdmick printf(tss_fmt, "tss_link", (void *)(uintptr_t)tss->tss_link); 18953dfcd6dcSdmick printf(tss_fmt, "tss_esp0", (void *)(uintptr_t)tss->tss_esp0); 18963dfcd6dcSdmick printf(tss_fmt, "tss_ss0", (void *)(uintptr_t)tss->tss_ss0); 18973dfcd6dcSdmick printf(tss_fmt, "tss_esp1", (void *)(uintptr_t)tss->tss_esp1); 18983dfcd6dcSdmick printf(tss_fmt, "tss_ss1", (void *)(uintptr_t)tss->tss_ss1); 18993dfcd6dcSdmick printf(tss_fmt, "tss_esp2", (void *)(uintptr_t)tss->tss_esp2); 19003dfcd6dcSdmick printf(tss_fmt, "tss_ss2", (void *)(uintptr_t)tss->tss_ss2); 19013dfcd6dcSdmick printf(tss_fmt, "tss_cr3", (void *)(uintptr_t)tss->tss_cr3); 19023dfcd6dcSdmick printf(tss_fmt, "tss_eip", (void *)(uintptr_t)tss->tss_eip); 19033dfcd6dcSdmick printf(tss_fmt, "tss_eflags", (void *)(uintptr_t)tss->tss_eflags); 19043dfcd6dcSdmick printf(tss_fmt, "tss_eax", (void *)(uintptr_t)tss->tss_eax); 19053dfcd6dcSdmick printf(tss_fmt, "tss_ebx", (void *)(uintptr_t)tss->tss_ebx); 19063dfcd6dcSdmick printf(tss_fmt, "tss_ecx", (void *)(uintptr_t)tss->tss_ecx); 19073dfcd6dcSdmick printf(tss_fmt, "tss_edx", (void *)(uintptr_t)tss->tss_edx); 19083dfcd6dcSdmick printf(tss_fmt, "tss_esp", (void *)(uintptr_t)tss->tss_esp); 19097c478bd9Sstevel@tonic-gate } 19107c478bd9Sstevel@tonic-gate 19117c478bd9Sstevel@tonic-gate #endif /* __amd64 */ 19127c478bd9Sstevel@tonic-gate 19137c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 19147c478bd9Sstevel@tonic-gate 19157c478bd9Sstevel@tonic-gate int ttrace_nrec = 0; /* number of records to dump out */ 19167c478bd9Sstevel@tonic-gate int ttrace_dump_nregs = 5; /* dump out this many records with regs too */ 19177c478bd9Sstevel@tonic-gate 19187c478bd9Sstevel@tonic-gate /* 19197c478bd9Sstevel@tonic-gate * Dump out the last ttrace_nrec traptrace records on each CPU 19207c478bd9Sstevel@tonic-gate */ 19217c478bd9Sstevel@tonic-gate static void 19227c478bd9Sstevel@tonic-gate dump_ttrace(void) 19237c478bd9Sstevel@tonic-gate { 19247c478bd9Sstevel@tonic-gate trap_trace_ctl_t *ttc; 19257c478bd9Sstevel@tonic-gate trap_trace_rec_t *rec; 19267c478bd9Sstevel@tonic-gate uintptr_t current; 19277c478bd9Sstevel@tonic-gate int i, j, k; 19287c478bd9Sstevel@tonic-gate int n = NCPU; 19297c478bd9Sstevel@tonic-gate #if defined(__amd64) 19307c478bd9Sstevel@tonic-gate const char banner[] = 19317c478bd9Sstevel@tonic-gate "\ncpu address timestamp " 19327c478bd9Sstevel@tonic-gate "type vc handler pc\n"; 19337c478bd9Sstevel@tonic-gate const char fmt1[] = "%3d %016lx %12llx "; 19347c478bd9Sstevel@tonic-gate #elif defined(__i386) 19357c478bd9Sstevel@tonic-gate const char banner[] = 1936ae115bc7Smrj "\ncpu address timestamp type vc handler pc\n"; 19377c478bd9Sstevel@tonic-gate const char fmt1[] = "%3d %08lx %12llx "; 19387c478bd9Sstevel@tonic-gate #endif 19397c478bd9Sstevel@tonic-gate const char fmt2[] = "%4s %3x "; 19407c478bd9Sstevel@tonic-gate const char fmt3[] = "%8s "; 19417c478bd9Sstevel@tonic-gate 19427c478bd9Sstevel@tonic-gate if (ttrace_nrec == 0) 19437c478bd9Sstevel@tonic-gate return; 19447c478bd9Sstevel@tonic-gate 19457c478bd9Sstevel@tonic-gate printf(banner); 19467c478bd9Sstevel@tonic-gate 19477c478bd9Sstevel@tonic-gate for (i = 0; i < n; i++) { 19487c478bd9Sstevel@tonic-gate ttc = &trap_trace_ctl[i]; 19497c478bd9Sstevel@tonic-gate if (ttc->ttc_first == NULL) 19507c478bd9Sstevel@tonic-gate continue; 19517c478bd9Sstevel@tonic-gate 19527c478bd9Sstevel@tonic-gate current = ttc->ttc_next - sizeof (trap_trace_rec_t); 19537c478bd9Sstevel@tonic-gate for (j = 0; j < ttrace_nrec; j++) { 19547c478bd9Sstevel@tonic-gate struct sysent *sys; 19557c478bd9Sstevel@tonic-gate struct autovec *vec; 19567c478bd9Sstevel@tonic-gate extern struct av_head autovect[]; 19577c478bd9Sstevel@tonic-gate int type; 19587c478bd9Sstevel@tonic-gate ulong_t off; 19597c478bd9Sstevel@tonic-gate char *sym, *stype; 19607c478bd9Sstevel@tonic-gate 19617c478bd9Sstevel@tonic-gate if (current < ttc->ttc_first) 19627c478bd9Sstevel@tonic-gate current = 19637c478bd9Sstevel@tonic-gate ttc->ttc_limit - sizeof (trap_trace_rec_t); 19647c478bd9Sstevel@tonic-gate 19657c478bd9Sstevel@tonic-gate if (current == NULL) 19667c478bd9Sstevel@tonic-gate continue; 19677c478bd9Sstevel@tonic-gate 19687c478bd9Sstevel@tonic-gate rec = (trap_trace_rec_t *)current; 19697c478bd9Sstevel@tonic-gate 19707c478bd9Sstevel@tonic-gate if (rec->ttr_stamp == 0) 19717c478bd9Sstevel@tonic-gate break; 19727c478bd9Sstevel@tonic-gate 19737c478bd9Sstevel@tonic-gate printf(fmt1, i, (uintptr_t)rec, rec->ttr_stamp); 19747c478bd9Sstevel@tonic-gate 19757c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 19767c478bd9Sstevel@tonic-gate case TT_SYSCALL: 19777c478bd9Sstevel@tonic-gate case TT_SYSENTER: 19787c478bd9Sstevel@tonic-gate case TT_SYSC: 19797c478bd9Sstevel@tonic-gate case TT_SYSC64: 19807c478bd9Sstevel@tonic-gate #if defined(__amd64) 19817c478bd9Sstevel@tonic-gate sys = &sysent32[rec->ttr_sysnum]; 19827c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 19837c478bd9Sstevel@tonic-gate case TT_SYSC64: 19847c478bd9Sstevel@tonic-gate sys = &sysent[rec->ttr_sysnum]; 19857c478bd9Sstevel@tonic-gate /*FALLTHROUGH*/ 19867c478bd9Sstevel@tonic-gate #elif defined(__i386) 19877c478bd9Sstevel@tonic-gate sys = &sysent[rec->ttr_sysnum]; 19887c478bd9Sstevel@tonic-gate switch (rec->ttr_marker) { 19897c478bd9Sstevel@tonic-gate case TT_SYSC64: 19907c478bd9Sstevel@tonic-gate #endif 19917c478bd9Sstevel@tonic-gate case TT_SYSC: 19927c478bd9Sstevel@tonic-gate stype = "sysc"; /* syscall */ 19937c478bd9Sstevel@tonic-gate break; 19947c478bd9Sstevel@tonic-gate case TT_SYSCALL: 19957c478bd9Sstevel@tonic-gate stype = "lcal"; /* lcall */ 19967c478bd9Sstevel@tonic-gate break; 19977c478bd9Sstevel@tonic-gate case TT_SYSENTER: 19987c478bd9Sstevel@tonic-gate stype = "syse"; /* sysenter */ 19997c478bd9Sstevel@tonic-gate break; 20007c478bd9Sstevel@tonic-gate default: 20017c478bd9Sstevel@tonic-gate break; 20027c478bd9Sstevel@tonic-gate } 20037c478bd9Sstevel@tonic-gate printf(fmt2, "sysc", rec->ttr_sysnum); 20047c478bd9Sstevel@tonic-gate if (sys != NULL) { 20057c478bd9Sstevel@tonic-gate sym = kobj_getsymname( 20067c478bd9Sstevel@tonic-gate (uintptr_t)sys->sy_callc, 20077c478bd9Sstevel@tonic-gate &off); 20087c478bd9Sstevel@tonic-gate if (sym != NULL) 2009ae115bc7Smrj printf(fmt3, sym); 20107c478bd9Sstevel@tonic-gate else 20117c478bd9Sstevel@tonic-gate printf("%p ", sys->sy_callc); 20127c478bd9Sstevel@tonic-gate } else { 2013ae115bc7Smrj printf(fmt3, "unknown"); 20147c478bd9Sstevel@tonic-gate } 20157c478bd9Sstevel@tonic-gate break; 20167c478bd9Sstevel@tonic-gate 20177c478bd9Sstevel@tonic-gate case TT_INTERRUPT: 20187c478bd9Sstevel@tonic-gate printf(fmt2, "intr", rec->ttr_vector); 20197c478bd9Sstevel@tonic-gate vec = (&autovect[rec->ttr_vector])->avh_link; 20207c478bd9Sstevel@tonic-gate if (vec != NULL) { 20217c478bd9Sstevel@tonic-gate sym = kobj_getsymname( 20227c478bd9Sstevel@tonic-gate (uintptr_t)vec->av_vector, &off); 20237c478bd9Sstevel@tonic-gate if (sym != NULL) 2024ae115bc7Smrj printf(fmt3, sym); 20257c478bd9Sstevel@tonic-gate else 20267c478bd9Sstevel@tonic-gate printf("%p ", vec->av_vector); 20277c478bd9Sstevel@tonic-gate } else { 2028ae115bc7Smrj printf(fmt3, "unknown "); 20297c478bd9Sstevel@tonic-gate } 20307c478bd9Sstevel@tonic-gate break; 20317c478bd9Sstevel@tonic-gate 20327c478bd9Sstevel@tonic-gate case TT_TRAP: 2033ae115bc7Smrj case TT_EVENT: 20347c478bd9Sstevel@tonic-gate type = rec->ttr_regs.r_trapno; 20357c478bd9Sstevel@tonic-gate printf(fmt2, "trap", type); 2036ae115bc7Smrj if (type < TRAP_TYPES) 2037ae115bc7Smrj printf(" #%s ", 2038ae115bc7Smrj trap_type_mnemonic[type]); 2039ae115bc7Smrj else 2040ae115bc7Smrj switch (type) { 2041ae115bc7Smrj case T_AST: 2042ae115bc7Smrj printf(fmt3, "ast"); 2043ae115bc7Smrj break; 2044ae115bc7Smrj default: 2045ae115bc7Smrj printf(fmt3, ""); 2046ae115bc7Smrj break; 2047ae115bc7Smrj } 2048ae115bc7Smrj break; 2049ae115bc7Smrj 2050ae115bc7Smrj case TT_XCALL: 2051ae115bc7Smrj printf(fmt2, "xcal", 2052ae115bc7Smrj rec->ttr_info.xc_entry.xce_marker); 2053ae115bc7Smrj printf(fmt3, ""); 20547c478bd9Sstevel@tonic-gate break; 20557c478bd9Sstevel@tonic-gate 20567c478bd9Sstevel@tonic-gate default: 20577c478bd9Sstevel@tonic-gate break; 20587c478bd9Sstevel@tonic-gate } 20597c478bd9Sstevel@tonic-gate 20607c478bd9Sstevel@tonic-gate sym = kobj_getsymname(rec->ttr_regs.r_pc, &off); 20617c478bd9Sstevel@tonic-gate if (sym != NULL) 20627c478bd9Sstevel@tonic-gate printf("%s+%lx\n", sym, off); 20637c478bd9Sstevel@tonic-gate else 20647c478bd9Sstevel@tonic-gate printf("%lx\n", rec->ttr_regs.r_pc); 20657c478bd9Sstevel@tonic-gate 20667c478bd9Sstevel@tonic-gate if (ttrace_dump_nregs-- > 0) { 20677c478bd9Sstevel@tonic-gate int s; 20687c478bd9Sstevel@tonic-gate 20697c478bd9Sstevel@tonic-gate if (rec->ttr_marker == TT_INTERRUPT) 20707c478bd9Sstevel@tonic-gate printf( 20717c478bd9Sstevel@tonic-gate "\t\tipl %x spl %x pri %x\n", 20727c478bd9Sstevel@tonic-gate rec->ttr_ipl, 20737c478bd9Sstevel@tonic-gate rec->ttr_spl, 20747c478bd9Sstevel@tonic-gate rec->ttr_pri); 20757c478bd9Sstevel@tonic-gate 20767c478bd9Sstevel@tonic-gate dumpregs(&rec->ttr_regs); 20777c478bd9Sstevel@tonic-gate 20787c478bd9Sstevel@tonic-gate printf("\t%3s: %p\n\n", " ct", 20797c478bd9Sstevel@tonic-gate (void *)rec->ttr_curthread); 20807c478bd9Sstevel@tonic-gate 20817c478bd9Sstevel@tonic-gate /* 20827c478bd9Sstevel@tonic-gate * print out the pc stack that we recorded 20837c478bd9Sstevel@tonic-gate * at trap time (if any) 20847c478bd9Sstevel@tonic-gate */ 20857c478bd9Sstevel@tonic-gate for (s = 0; s < rec->ttr_sdepth; s++) { 20867c478bd9Sstevel@tonic-gate uintptr_t fullpc; 20877c478bd9Sstevel@tonic-gate 20887c478bd9Sstevel@tonic-gate if (s >= TTR_STACK_DEPTH) { 20897c478bd9Sstevel@tonic-gate printf("ttr_sdepth corrupt\n"); 20907c478bd9Sstevel@tonic-gate break; 20917c478bd9Sstevel@tonic-gate } 20927c478bd9Sstevel@tonic-gate 20937c478bd9Sstevel@tonic-gate fullpc = (uintptr_t)rec->ttr_stack[s]; 20947c478bd9Sstevel@tonic-gate 20957c478bd9Sstevel@tonic-gate sym = kobj_getsymname(fullpc, &off); 20967c478bd9Sstevel@tonic-gate if (sym != NULL) 20977c478bd9Sstevel@tonic-gate printf("-> %s+0x%lx()\n", 20987c478bd9Sstevel@tonic-gate sym, off); 20997c478bd9Sstevel@tonic-gate else 21007c478bd9Sstevel@tonic-gate printf("-> 0x%lx()\n", fullpc); 21017c478bd9Sstevel@tonic-gate } 21027c478bd9Sstevel@tonic-gate printf("\n"); 21037c478bd9Sstevel@tonic-gate } 21047c478bd9Sstevel@tonic-gate current -= sizeof (trap_trace_rec_t); 21057c478bd9Sstevel@tonic-gate } 21067c478bd9Sstevel@tonic-gate } 21077c478bd9Sstevel@tonic-gate } 21087c478bd9Sstevel@tonic-gate 2109ae115bc7Smrj /* 2110ae115bc7Smrj * Help with constructing traptrace records in C 2111ae115bc7Smrj */ 2112ae115bc7Smrj trap_trace_rec_t * 2113ae115bc7Smrj trap_trace_get_traceptr(uint8_t marker, ulong_t pc, ulong_t sp) 2114ae115bc7Smrj { 2115ae115bc7Smrj trap_trace_rec_t *ttr; 2116ae115bc7Smrj 2117ae115bc7Smrj if (trap_trace_freeze) 2118ae115bc7Smrj ttr = &trap_trace_postmort; 2119ae115bc7Smrj else { 2120ae115bc7Smrj trap_trace_ctl_t *ttc = &trap_trace_ctl[CPU->cpu_id]; 2121ae115bc7Smrj 2122ae115bc7Smrj ttr = (void *)ttc->ttc_next; 2123ae115bc7Smrj 2124ae115bc7Smrj if (ttc->ttc_next >= ttc->ttc_limit) 2125ae115bc7Smrj ttc->ttc_next = ttc->ttc_first; 2126ae115bc7Smrj else 2127ae115bc7Smrj ttc->ttc_next += sizeof (trap_trace_rec_t); 2128ae115bc7Smrj } 2129ae115bc7Smrj 2130ae115bc7Smrj ttr->ttr_regs.r_sp = sp; 2131ae115bc7Smrj ttr->ttr_regs.r_pc = pc; 2132ae115bc7Smrj ttr->ttr_cr2 = getcr2(); 2133ae115bc7Smrj ttr->ttr_curthread = (uintptr_t)curthread; 2134ae115bc7Smrj ttr->ttr_stamp = tsc_read(); 2135ae115bc7Smrj ttr->ttr_marker = marker; 2136ae115bc7Smrj return (ttr); 2137ae115bc7Smrj } 2138ae115bc7Smrj 21397c478bd9Sstevel@tonic-gate #endif /* TRAPTRACE */ 21407c478bd9Sstevel@tonic-gate 21417c478bd9Sstevel@tonic-gate void 21427c478bd9Sstevel@tonic-gate panic_showtrap(struct trap_info *tip) 21437c478bd9Sstevel@tonic-gate { 21447c478bd9Sstevel@tonic-gate showregs(tip->trap_type, tip->trap_regs, tip->trap_addr); 21457c478bd9Sstevel@tonic-gate 21467c478bd9Sstevel@tonic-gate #if defined(TRAPTRACE) 21477c478bd9Sstevel@tonic-gate dump_ttrace(); 21487c478bd9Sstevel@tonic-gate #endif /* TRAPTRACE */ 21497c478bd9Sstevel@tonic-gate 21507c478bd9Sstevel@tonic-gate if (tip->trap_type == T_DBLFLT) 21517c478bd9Sstevel@tonic-gate dump_tss(); 21527c478bd9Sstevel@tonic-gate } 21537c478bd9Sstevel@tonic-gate 21547c478bd9Sstevel@tonic-gate void 21557c478bd9Sstevel@tonic-gate panic_savetrap(panic_data_t *pdp, struct trap_info *tip) 21567c478bd9Sstevel@tonic-gate { 21577c478bd9Sstevel@tonic-gate panic_saveregs(pdp, tip->trap_regs); 21587c478bd9Sstevel@tonic-gate } 2159