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 5ac448965Sahl * Common Development and Distribution License (the "License"). 6ac448965Sahl * 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 */ 21ac448965Sahl 227c478bd9Sstevel@tonic-gate /* 23ac448965Sahl * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 277c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate #include <sys/fasttrap_isa.h> 307c478bd9Sstevel@tonic-gate #include <sys/fasttrap_impl.h> 317c478bd9Sstevel@tonic-gate #include <sys/dtrace.h> 327c478bd9Sstevel@tonic-gate #include <sys/dtrace_impl.h> 337c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h> 347c478bd9Sstevel@tonic-gate #include <sys/regset.h> 357c478bd9Sstevel@tonic-gate #include <sys/privregs.h> 367c478bd9Sstevel@tonic-gate #include <sys/segments.h> 377c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 387c478bd9Sstevel@tonic-gate #include <sys/trap.h> 399acbbeafSnn #include <sys/archsystm.h> 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate /* 427c478bd9Sstevel@tonic-gate * Lossless User-Land Tracing on x86 437c478bd9Sstevel@tonic-gate * --------------------------------- 447c478bd9Sstevel@tonic-gate * 45ac448965Sahl * The execution of most instructions is not dependent on the address; for 46ac448965Sahl * these instructions it is sufficient to copy them into the user process's 47ac448965Sahl * address space and execute them. To effectively single-step an instruction 48ac448965Sahl * in user-land, we copy out the following sequence of instructions to scratch 497c478bd9Sstevel@tonic-gate * space in the user thread's ulwp_t structure. 507c478bd9Sstevel@tonic-gate * 517c478bd9Sstevel@tonic-gate * We then set the program counter (%eip or %rip) to point to this scratch 527c478bd9Sstevel@tonic-gate * space. Once execution resumes, the original instruction is executed and 537c478bd9Sstevel@tonic-gate * then control flow is redirected to what was originally the subsequent 547c478bd9Sstevel@tonic-gate * instruction. If the kernel attemps to deliver a signal while single- 557c478bd9Sstevel@tonic-gate * stepping, the signal is deferred and the program counter is moved into the 567c478bd9Sstevel@tonic-gate * second sequence of instructions. The second sequence ends in a trap into 577c478bd9Sstevel@tonic-gate * the kernel where the deferred signal is then properly handled and delivered. 587c478bd9Sstevel@tonic-gate * 597c478bd9Sstevel@tonic-gate * For instructions whose execute is position dependent, we perform simple 607c478bd9Sstevel@tonic-gate * emulation. These instructions are limited to control transfer 617c478bd9Sstevel@tonic-gate * instructions in 32-bit mode, but in 64-bit mode there's the added wrinkle 627c478bd9Sstevel@tonic-gate * of %rip-relative addressing that means that almost any instruction can be 637c478bd9Sstevel@tonic-gate * position dependent. For all the details on how we emulate generic 647c478bd9Sstevel@tonic-gate * instructions included %rip-relative instructions, see the code in 657c478bd9Sstevel@tonic-gate * fasttrap_pid_probe() below where we handle instructions of type 667c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON (under the header: Generic Instruction Tracing). 677c478bd9Sstevel@tonic-gate */ 687c478bd9Sstevel@tonic-gate 697c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_MOD(modrm) (((modrm) >> 6) & 0x3) 707c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_REG(modrm) (((modrm) >> 3) & 0x7) 717c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_RM(modrm) ((modrm) & 0x7) 727c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM(mod, reg, rm) (((mod) << 6) | ((reg) << 3) | (rm)) 737c478bd9Sstevel@tonic-gate 747c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_SCALE(sib) (((sib) >> 6) & 0x3) 757c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_INDEX(sib) (((sib) >> 3) & 0x7) 767c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_BASE(sib) ((sib) & 0x7) 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_W(rex) (((rex) >> 3) & 1) 797c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_R(rex) (((rex) >> 2) & 1) 807c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_X(rex) (((rex) >> 1) & 1) 817c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_B(rex) ((rex) & 1) 827c478bd9Sstevel@tonic-gate #define FASTTRAP_REX(w, r, x, b) \ 837c478bd9Sstevel@tonic-gate (0x40 | ((w) << 3) | ((r) << 2) | ((x) << 1) | (b)) 847c478bd9Sstevel@tonic-gate 857c478bd9Sstevel@tonic-gate /* 867c478bd9Sstevel@tonic-gate * Single-byte op-codes. 877c478bd9Sstevel@tonic-gate */ 887c478bd9Sstevel@tonic-gate #define FASTTRAP_PUSHL_EBP 0x55 897c478bd9Sstevel@tonic-gate 907c478bd9Sstevel@tonic-gate #define FASTTRAP_JO 0x70 917c478bd9Sstevel@tonic-gate #define FASTTRAP_JNO 0x71 927c478bd9Sstevel@tonic-gate #define FASTTRAP_JB 0x72 937c478bd9Sstevel@tonic-gate #define FASTTRAP_JAE 0x73 947c478bd9Sstevel@tonic-gate #define FASTTRAP_JE 0x74 957c478bd9Sstevel@tonic-gate #define FASTTRAP_JNE 0x75 967c478bd9Sstevel@tonic-gate #define FASTTRAP_JBE 0x76 977c478bd9Sstevel@tonic-gate #define FASTTRAP_JA 0x77 987c478bd9Sstevel@tonic-gate #define FASTTRAP_JS 0x78 997c478bd9Sstevel@tonic-gate #define FASTTRAP_JNS 0x79 1007c478bd9Sstevel@tonic-gate #define FASTTRAP_JP 0x7a 1017c478bd9Sstevel@tonic-gate #define FASTTRAP_JNP 0x7b 1027c478bd9Sstevel@tonic-gate #define FASTTRAP_JL 0x7c 1037c478bd9Sstevel@tonic-gate #define FASTTRAP_JGE 0x7d 1047c478bd9Sstevel@tonic-gate #define FASTTRAP_JLE 0x7e 1057c478bd9Sstevel@tonic-gate #define FASTTRAP_JG 0x7f 1067c478bd9Sstevel@tonic-gate 107*2b6e762cSahl #define FASTTRAP_NOP 0x90 108*2b6e762cSahl 1097c478bd9Sstevel@tonic-gate #define FASTTRAP_MOV_EAX 0xb8 1107c478bd9Sstevel@tonic-gate #define FASTTRAP_MOV_ECX 0xb9 1117c478bd9Sstevel@tonic-gate 1127c478bd9Sstevel@tonic-gate #define FASTTRAP_RET16 0xc2 1137c478bd9Sstevel@tonic-gate #define FASTTRAP_RET 0xc3 1147c478bd9Sstevel@tonic-gate 1157c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOPNZ 0xe0 1167c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOPZ 0xe1 1177c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOP 0xe2 1187c478bd9Sstevel@tonic-gate #define FASTTRAP_JCXZ 0xe3 1197c478bd9Sstevel@tonic-gate 1207c478bd9Sstevel@tonic-gate #define FASTTRAP_CALL 0xe8 1217c478bd9Sstevel@tonic-gate #define FASTTRAP_JMP32 0xe9 1227c478bd9Sstevel@tonic-gate #define FASTTRAP_JMP8 0xeb 1237c478bd9Sstevel@tonic-gate 1247c478bd9Sstevel@tonic-gate #define FASTTRAP_INT3 0xcc 1257c478bd9Sstevel@tonic-gate #define FASTTRAP_INT 0xcd 1267c478bd9Sstevel@tonic-gate 1277c478bd9Sstevel@tonic-gate #define FASTTRAP_2_BYTE_OP 0x0f 1287c478bd9Sstevel@tonic-gate #define FASTTRAP_GROUP5_OP 0xff 1297c478bd9Sstevel@tonic-gate 1307c478bd9Sstevel@tonic-gate /* 1317c478bd9Sstevel@tonic-gate * Two-byte op-codes (second byte only). 1327c478bd9Sstevel@tonic-gate */ 1337c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JO 0x80 1347c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNO 0x81 1357c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JB 0x82 1367c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JAE 0x83 1377c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JE 0x84 1387c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNE 0x85 1397c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JBE 0x86 1407c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JA 0x87 1417c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JS 0x88 1427c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNS 0x89 1437c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JP 0x8a 1447c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNP 0x8b 1457c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JL 0x8c 1467c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JGE 0x8d 1477c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JLE 0x8e 1487c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JG 0x8f 1497c478bd9Sstevel@tonic-gate 1507c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_OF 0x800 1517c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_DF 0x400 1527c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_SF 0x080 1537c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_ZF 0x040 1547c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_AF 0x010 1557c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_PF 0x004 1567c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_CF 0x001 1577c478bd9Sstevel@tonic-gate 1587c478bd9Sstevel@tonic-gate /* 1597c478bd9Sstevel@tonic-gate * Instruction prefixes. 1607c478bd9Sstevel@tonic-gate */ 1617c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_OPERAND 0x66 1627c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_ADDRESS 0x67 1637c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_CS 0x2E 1647c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_DS 0x3E 1657c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_ES 0x26 1667c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_FS 0x64 1677c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_GS 0x65 1687c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_SS 0x36 1697c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_LOCK 0xF0 1707c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_REP 0xF3 1717c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_REPNE 0xF2 1727c478bd9Sstevel@tonic-gate 1737c478bd9Sstevel@tonic-gate #define FASTTRAP_NOREG 0xff 1747c478bd9Sstevel@tonic-gate 1757c478bd9Sstevel@tonic-gate /* 1767c478bd9Sstevel@tonic-gate * Map between instruction register encodings and the kernel constants which 1777c478bd9Sstevel@tonic-gate * correspond to indicies into struct regs. 1787c478bd9Sstevel@tonic-gate */ 1797c478bd9Sstevel@tonic-gate #ifdef __amd64 1807c478bd9Sstevel@tonic-gate static const uint8_t regmap[16] = { 1817c478bd9Sstevel@tonic-gate REG_RAX, REG_RCX, REG_RDX, REG_RBX, REG_RSP, REG_RBP, REG_RSI, REG_RDI, 1827c478bd9Sstevel@tonic-gate REG_R8, REG_R9, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15, 1837c478bd9Sstevel@tonic-gate }; 1847c478bd9Sstevel@tonic-gate #else 1857c478bd9Sstevel@tonic-gate static const uint8_t regmap[8] = { 1867c478bd9Sstevel@tonic-gate EAX, ECX, EDX, EBX, UESP, EBP, ESI, EDI 1877c478bd9Sstevel@tonic-gate }; 1887c478bd9Sstevel@tonic-gate #endif 1897c478bd9Sstevel@tonic-gate 1907c478bd9Sstevel@tonic-gate static ulong_t fasttrap_getreg(struct regs *, uint_t); 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate static uint64_t 1937c478bd9Sstevel@tonic-gate fasttrap_anarg(struct regs *rp, int function_entry, int argno) 1947c478bd9Sstevel@tonic-gate { 1957c478bd9Sstevel@tonic-gate uint64_t value; 1967c478bd9Sstevel@tonic-gate int shift = function_entry ? 1 : 0; 1977c478bd9Sstevel@tonic-gate 1987c478bd9Sstevel@tonic-gate #ifdef __amd64 1997c478bd9Sstevel@tonic-gate if (curproc->p_model == DATAMODEL_LP64) { 2007c478bd9Sstevel@tonic-gate uintptr_t *stack; 2017c478bd9Sstevel@tonic-gate 2027c478bd9Sstevel@tonic-gate /* 2037c478bd9Sstevel@tonic-gate * In 64-bit mode, the first six arguments are stored in 2047c478bd9Sstevel@tonic-gate * registers. 2057c478bd9Sstevel@tonic-gate */ 2067c478bd9Sstevel@tonic-gate if (argno < 6) 2077c478bd9Sstevel@tonic-gate return ((&rp->r_rdi)[argno]); 2087c478bd9Sstevel@tonic-gate 2097c478bd9Sstevel@tonic-gate stack = (uintptr_t *)rp->r_sp; 2107c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 2117c478bd9Sstevel@tonic-gate value = dtrace_fulword(&stack[argno - 6 + shift]); 2127c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); 2137c478bd9Sstevel@tonic-gate } else { 2147c478bd9Sstevel@tonic-gate #endif 2157c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp; 2167c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); 2177c478bd9Sstevel@tonic-gate value = dtrace_fuword32(&stack[argno + shift]); 2187c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR); 2197c478bd9Sstevel@tonic-gate #ifdef __amd64 2207c478bd9Sstevel@tonic-gate } 2217c478bd9Sstevel@tonic-gate #endif 2227c478bd9Sstevel@tonic-gate 2237c478bd9Sstevel@tonic-gate return (value); 2247c478bd9Sstevel@tonic-gate } 2257c478bd9Sstevel@tonic-gate 2267c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 2277c478bd9Sstevel@tonic-gate int 228ac448965Sahl fasttrap_tracepoint_init(proc_t *p, fasttrap_tracepoint_t *tp, uintptr_t pc, 229ac448965Sahl fasttrap_probe_type_t type) 2307c478bd9Sstevel@tonic-gate { 2317c478bd9Sstevel@tonic-gate uint8_t instr[FASTTRAP_MAX_INSTR_SIZE + 10]; 2327c478bd9Sstevel@tonic-gate size_t len = FASTTRAP_MAX_INSTR_SIZE; 2337c478bd9Sstevel@tonic-gate size_t first = MIN(len, PAGESIZE - (pc & PAGEOFFSET)); 2347c478bd9Sstevel@tonic-gate uint_t start = 0; 235*2b6e762cSahl int rmindex, size; 2369acbbeafSnn uint8_t seg, rex = 0; 2377c478bd9Sstevel@tonic-gate 2387c478bd9Sstevel@tonic-gate /* 2397c478bd9Sstevel@tonic-gate * Read the instruction at the given address out of the process's 2407c478bd9Sstevel@tonic-gate * address space. We don't have to worry about a debugger 2417c478bd9Sstevel@tonic-gate * changing this instruction before we overwrite it with our trap 2427c478bd9Sstevel@tonic-gate * instruction since P_PR_LOCK is set. Since instructions can span 2437c478bd9Sstevel@tonic-gate * pages, we potentially read the instruction in two parts. If the 2447c478bd9Sstevel@tonic-gate * second part fails, we just zero out that part of the instruction. 2457c478bd9Sstevel@tonic-gate */ 2467c478bd9Sstevel@tonic-gate if (uread(p, &instr[0], first, pc) != 0) 2477c478bd9Sstevel@tonic-gate return (-1); 2487c478bd9Sstevel@tonic-gate if (len > first && 2497c478bd9Sstevel@tonic-gate uread(p, &instr[first], len - first, pc + first) != 0) { 2507c478bd9Sstevel@tonic-gate bzero(&instr[first], len - first); 2517c478bd9Sstevel@tonic-gate len = first; 2527c478bd9Sstevel@tonic-gate } 2537c478bd9Sstevel@tonic-gate 2547c478bd9Sstevel@tonic-gate /* 2557c478bd9Sstevel@tonic-gate * If the disassembly fails, then we have a malformed instruction. 2567c478bd9Sstevel@tonic-gate */ 257*2b6e762cSahl if ((size = dtrace_instr_size_isa(instr, p->p_model, &rmindex)) <= 0) 2587c478bd9Sstevel@tonic-gate return (-1); 2597c478bd9Sstevel@tonic-gate 2607c478bd9Sstevel@tonic-gate /* 2617c478bd9Sstevel@tonic-gate * Make sure the disassembler isn't completely broken. 2627c478bd9Sstevel@tonic-gate */ 263*2b6e762cSahl ASSERT(-1 <= rmindex && rmindex < size); 2647c478bd9Sstevel@tonic-gate 2657c478bd9Sstevel@tonic-gate /* 2667c478bd9Sstevel@tonic-gate * If the computed size is greater than the number of bytes read, 2677c478bd9Sstevel@tonic-gate * then it was a malformed instruction possibly because it fell on a 2687c478bd9Sstevel@tonic-gate * page boundary and the subsequent page was missing or because of 2697c478bd9Sstevel@tonic-gate * some malicious user. 2707c478bd9Sstevel@tonic-gate */ 271*2b6e762cSahl if (size > len) 2727c478bd9Sstevel@tonic-gate return (-1); 2737c478bd9Sstevel@tonic-gate 274*2b6e762cSahl tp->ftt_size = (uint8_t)size; 2759acbbeafSnn tp->ftt_segment = FASTTRAP_SEG_NONE; 2769acbbeafSnn 2777c478bd9Sstevel@tonic-gate /* 2787c478bd9Sstevel@tonic-gate * Find the start of the instruction's opcode by processing any 2797c478bd9Sstevel@tonic-gate * legacy prefixes. 2807c478bd9Sstevel@tonic-gate */ 2817c478bd9Sstevel@tonic-gate for (;;) { 2829acbbeafSnn seg = 0; 2837c478bd9Sstevel@tonic-gate switch (instr[start]) { 2849acbbeafSnn case FASTTRAP_PREFIX_SS: 2859acbbeafSnn seg++; 2869acbbeafSnn /*FALLTHRU*/ 2879acbbeafSnn case FASTTRAP_PREFIX_GS: 2889acbbeafSnn seg++; 2899acbbeafSnn /*FALLTHRU*/ 2909acbbeafSnn case FASTTRAP_PREFIX_FS: 2919acbbeafSnn seg++; 2929acbbeafSnn /*FALLTHRU*/ 2939acbbeafSnn case FASTTRAP_PREFIX_ES: 2949acbbeafSnn seg++; 2959acbbeafSnn /*FALLTHRU*/ 2969acbbeafSnn case FASTTRAP_PREFIX_DS: 2979acbbeafSnn seg++; 2989acbbeafSnn /*FALLTHRU*/ 2999acbbeafSnn case FASTTRAP_PREFIX_CS: 3009acbbeafSnn seg++; 3019acbbeafSnn /*FALLTHRU*/ 3027c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_OPERAND: 3037c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_ADDRESS: 3047c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_LOCK: 3057c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_REP: 3067c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_REPNE: 3079acbbeafSnn if (seg != 0) { 3089acbbeafSnn /* 3099acbbeafSnn * It's illegal for an instruction to specify 3109acbbeafSnn * two segment prefixes -- give up on this 3119acbbeafSnn * illegal instruction. 3129acbbeafSnn */ 3139acbbeafSnn if (tp->ftt_segment != FASTTRAP_SEG_NONE) 3149acbbeafSnn return (-1); 3159acbbeafSnn 3169acbbeafSnn tp->ftt_segment = seg; 3179acbbeafSnn } 3187c478bd9Sstevel@tonic-gate start++; 3197c478bd9Sstevel@tonic-gate continue; 3207c478bd9Sstevel@tonic-gate } 3217c478bd9Sstevel@tonic-gate break; 3227c478bd9Sstevel@tonic-gate } 3237c478bd9Sstevel@tonic-gate 3247c478bd9Sstevel@tonic-gate #ifdef __amd64 3257c478bd9Sstevel@tonic-gate /* 3267c478bd9Sstevel@tonic-gate * Identify the REX prefix on 64-bit processes. 3277c478bd9Sstevel@tonic-gate */ 3287c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64 && (instr[start] & 0xf0) == 0x40) 3297c478bd9Sstevel@tonic-gate rex = instr[start++]; 3307c478bd9Sstevel@tonic-gate #endif 3317c478bd9Sstevel@tonic-gate 3327c478bd9Sstevel@tonic-gate /* 3337c478bd9Sstevel@tonic-gate * Now that we're pretty sure that the instruction is okay, copy the 3347c478bd9Sstevel@tonic-gate * valid part to the tracepoint. 3357c478bd9Sstevel@tonic-gate */ 3367c478bd9Sstevel@tonic-gate bcopy(instr, tp->ftt_instr, FASTTRAP_MAX_INSTR_SIZE); 3377c478bd9Sstevel@tonic-gate 3387c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_COMMON; 3397c478bd9Sstevel@tonic-gate if (instr[start] == FASTTRAP_2_BYTE_OP) { 3407c478bd9Sstevel@tonic-gate switch (instr[start + 1]) { 3417c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JO: 3427c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNO: 3437c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JB: 3447c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JAE: 3457c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JE: 3467c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNE: 3477c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JBE: 3487c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JA: 3497c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JS: 3507c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNS: 3517c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JP: 3527c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNP: 3537c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JL: 3547c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JGE: 3557c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JLE: 3567c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JG: 3577c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCC; 3587c478bd9Sstevel@tonic-gate tp->ftt_code = (instr[start + 1] & 0x0f) | FASTTRAP_JO; 3597c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 3607c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 2]; 3617c478bd9Sstevel@tonic-gate break; 3627c478bd9Sstevel@tonic-gate } 3637c478bd9Sstevel@tonic-gate } else if (instr[start] == FASTTRAP_GROUP5_OP) { 3647c478bd9Sstevel@tonic-gate uint_t mod = FASTTRAP_MODRM_MOD(instr[start + 1]); 3657c478bd9Sstevel@tonic-gate uint_t reg = FASTTRAP_MODRM_REG(instr[start + 1]); 3667c478bd9Sstevel@tonic-gate uint_t rm = FASTTRAP_MODRM_RM(instr[start + 1]); 3677c478bd9Sstevel@tonic-gate 3687c478bd9Sstevel@tonic-gate if (reg == 2 || reg == 4) { 3697c478bd9Sstevel@tonic-gate uint_t i, sz; 3707c478bd9Sstevel@tonic-gate 3717c478bd9Sstevel@tonic-gate if (reg == 2) 3727c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_CALL; 3737c478bd9Sstevel@tonic-gate else 3747c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP; 3757c478bd9Sstevel@tonic-gate 3767c478bd9Sstevel@tonic-gate if (mod == 3) 3777c478bd9Sstevel@tonic-gate tp->ftt_code = 2; 3787c478bd9Sstevel@tonic-gate else 3797c478bd9Sstevel@tonic-gate tp->ftt_code = 1; 3807c478bd9Sstevel@tonic-gate 3817c478bd9Sstevel@tonic-gate ASSERT(p->p_model == DATAMODEL_LP64 || rex == 0); 3827c478bd9Sstevel@tonic-gate 3837c478bd9Sstevel@tonic-gate /* 3847c478bd9Sstevel@tonic-gate * See AMD x86-64 Architecture Programmer's Manual 3857c478bd9Sstevel@tonic-gate * Volume 3, Section 1.2.7, Table 1-12, and 3867c478bd9Sstevel@tonic-gate * Appendix A.3.1, Table A-15. 3877c478bd9Sstevel@tonic-gate */ 3887c478bd9Sstevel@tonic-gate if (mod != 3 && rm == 4) { 3897c478bd9Sstevel@tonic-gate uint8_t sib = instr[start + 2]; 3907c478bd9Sstevel@tonic-gate uint_t index = FASTTRAP_SIB_INDEX(sib); 3917c478bd9Sstevel@tonic-gate uint_t base = FASTTRAP_SIB_BASE(sib); 3927c478bd9Sstevel@tonic-gate 3937c478bd9Sstevel@tonic-gate tp->ftt_scale = FASTTRAP_SIB_SCALE(sib); 3947c478bd9Sstevel@tonic-gate 3957c478bd9Sstevel@tonic-gate tp->ftt_index = (index == 4) ? 3967c478bd9Sstevel@tonic-gate FASTTRAP_NOREG : 3977c478bd9Sstevel@tonic-gate regmap[index | (FASTTRAP_REX_X(rex) << 3)]; 3987c478bd9Sstevel@tonic-gate tp->ftt_base = (mod == 0 && base == 5) ? 3997c478bd9Sstevel@tonic-gate FASTTRAP_NOREG : 4007c478bd9Sstevel@tonic-gate regmap[base | (FASTTRAP_REX_B(rex) << 3)]; 4017c478bd9Sstevel@tonic-gate 4027c478bd9Sstevel@tonic-gate i = 3; 4037c478bd9Sstevel@tonic-gate sz = mod == 1 ? 1 : 4; 4047c478bd9Sstevel@tonic-gate } else { 4057c478bd9Sstevel@tonic-gate /* 4067c478bd9Sstevel@tonic-gate * In 64-bit mode, mod == 0 and r/m == 5 4077c478bd9Sstevel@tonic-gate * denotes %rip-relative addressing; in 32-bit 4087c478bd9Sstevel@tonic-gate * mode, the base register isn't used. In both 4097c478bd9Sstevel@tonic-gate * modes, there is a 32-bit operand. 4107c478bd9Sstevel@tonic-gate */ 4117c478bd9Sstevel@tonic-gate if (mod == 0 && rm == 5) { 4127c478bd9Sstevel@tonic-gate #ifdef __amd64 4137c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) 4147c478bd9Sstevel@tonic-gate tp->ftt_base = REG_RIP; 4157c478bd9Sstevel@tonic-gate else 4167c478bd9Sstevel@tonic-gate #endif 4177c478bd9Sstevel@tonic-gate tp->ftt_base = FASTTRAP_NOREG; 4187c478bd9Sstevel@tonic-gate sz = 4; 4197c478bd9Sstevel@tonic-gate } else { 4207c478bd9Sstevel@tonic-gate uint8_t base = rm | 4217c478bd9Sstevel@tonic-gate (FASTTRAP_REX_B(rex) << 3); 4227c478bd9Sstevel@tonic-gate 4237c478bd9Sstevel@tonic-gate tp->ftt_base = regmap[base]; 4247c478bd9Sstevel@tonic-gate sz = mod == 1 ? 1 : mod == 2 ? 4 : 0; 4257c478bd9Sstevel@tonic-gate } 4267c478bd9Sstevel@tonic-gate tp->ftt_index = FASTTRAP_NOREG; 4277c478bd9Sstevel@tonic-gate i = 2; 4287c478bd9Sstevel@tonic-gate } 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate if (sz == 1) 4317c478bd9Sstevel@tonic-gate tp->ftt_dest = *(int8_t *)&instr[start + i]; 4327c478bd9Sstevel@tonic-gate else if (sz == 4) 4337c478bd9Sstevel@tonic-gate tp->ftt_dest = *(int32_t *)&instr[start + i]; 4347c478bd9Sstevel@tonic-gate else 4357c478bd9Sstevel@tonic-gate tp->ftt_dest = 0; 4367c478bd9Sstevel@tonic-gate } 4377c478bd9Sstevel@tonic-gate } else { 4387c478bd9Sstevel@tonic-gate switch (instr[start]) { 4397c478bd9Sstevel@tonic-gate case FASTTRAP_RET: 4407c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_RET; 4417c478bd9Sstevel@tonic-gate break; 4427c478bd9Sstevel@tonic-gate 4437c478bd9Sstevel@tonic-gate case FASTTRAP_RET16: 4447c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_RET16; 4457c478bd9Sstevel@tonic-gate tp->ftt_dest = *(uint16_t *)&instr[start + 1]; 4467c478bd9Sstevel@tonic-gate break; 4477c478bd9Sstevel@tonic-gate 4487c478bd9Sstevel@tonic-gate case FASTTRAP_JO: 4497c478bd9Sstevel@tonic-gate case FASTTRAP_JNO: 4507c478bd9Sstevel@tonic-gate case FASTTRAP_JB: 4517c478bd9Sstevel@tonic-gate case FASTTRAP_JAE: 4527c478bd9Sstevel@tonic-gate case FASTTRAP_JE: 4537c478bd9Sstevel@tonic-gate case FASTTRAP_JNE: 4547c478bd9Sstevel@tonic-gate case FASTTRAP_JBE: 4557c478bd9Sstevel@tonic-gate case FASTTRAP_JA: 4567c478bd9Sstevel@tonic-gate case FASTTRAP_JS: 4577c478bd9Sstevel@tonic-gate case FASTTRAP_JNS: 4587c478bd9Sstevel@tonic-gate case FASTTRAP_JP: 4597c478bd9Sstevel@tonic-gate case FASTTRAP_JNP: 4607c478bd9Sstevel@tonic-gate case FASTTRAP_JL: 4617c478bd9Sstevel@tonic-gate case FASTTRAP_JGE: 4627c478bd9Sstevel@tonic-gate case FASTTRAP_JLE: 4637c478bd9Sstevel@tonic-gate case FASTTRAP_JG: 4647c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCC; 4657c478bd9Sstevel@tonic-gate tp->ftt_code = instr[start]; 4667c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 4677c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1]; 4687c478bd9Sstevel@tonic-gate break; 4697c478bd9Sstevel@tonic-gate 4707c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPNZ: 4717c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPZ: 4727c478bd9Sstevel@tonic-gate case FASTTRAP_LOOP: 4737c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_LOOP; 4747c478bd9Sstevel@tonic-gate tp->ftt_code = instr[start]; 4757c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 4767c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1]; 4777c478bd9Sstevel@tonic-gate break; 4787c478bd9Sstevel@tonic-gate 4797c478bd9Sstevel@tonic-gate case FASTTRAP_JCXZ: 4807c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCXZ; 4817c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 4827c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1]; 4837c478bd9Sstevel@tonic-gate break; 4847c478bd9Sstevel@tonic-gate 4857c478bd9Sstevel@tonic-gate case FASTTRAP_CALL: 4867c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_CALL; 4877c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 4887c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 1]; 4897c478bd9Sstevel@tonic-gate tp->ftt_code = 0; 4907c478bd9Sstevel@tonic-gate break; 4917c478bd9Sstevel@tonic-gate 4927c478bd9Sstevel@tonic-gate case FASTTRAP_JMP32: 4937c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP; 4947c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 4957c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 1]; 4967c478bd9Sstevel@tonic-gate break; 4977c478bd9Sstevel@tonic-gate case FASTTRAP_JMP8: 4987c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP; 4997c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size + 5007c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1]; 5017c478bd9Sstevel@tonic-gate break; 5027c478bd9Sstevel@tonic-gate 5037c478bd9Sstevel@tonic-gate case FASTTRAP_PUSHL_EBP: 5047c478bd9Sstevel@tonic-gate if (start == 0) 5057c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_PUSHL_EBP; 5067c478bd9Sstevel@tonic-gate break; 5077c478bd9Sstevel@tonic-gate 508*2b6e762cSahl case FASTTRAP_NOP: 509*2b6e762cSahl #ifdef __amd64 510*2b6e762cSahl ASSERT(p->p_model == DATAMODEL_LP64 || rex == 0); 511*2b6e762cSahl 512*2b6e762cSahl /* 513*2b6e762cSahl * On amd64 we have to be careful not to confuse a nop 514*2b6e762cSahl * (actually xchgl %eax, %eax) with an instruction using 515*2b6e762cSahl * the same opcode, but that does something different 516*2b6e762cSahl * (e.g. xchgl %r8d, %eax or xcghq %r8, %rax). 517*2b6e762cSahl */ 518*2b6e762cSahl if (FASTTRAP_REX_B(rex) == 0) 519*2b6e762cSahl #endif 520*2b6e762cSahl tp->ftt_type = FASTTRAP_T_NOP; 521*2b6e762cSahl break; 522*2b6e762cSahl 5237c478bd9Sstevel@tonic-gate case FASTTRAP_INT3: 5247c478bd9Sstevel@tonic-gate /* 5257c478bd9Sstevel@tonic-gate * The pid provider shares the int3 trap with debugger 5267c478bd9Sstevel@tonic-gate * breakpoints so we can't instrument them. 5277c478bd9Sstevel@tonic-gate */ 5287c478bd9Sstevel@tonic-gate ASSERT(instr[start] == FASTTRAP_INSTR); 5297c478bd9Sstevel@tonic-gate return (-1); 5309acbbeafSnn 5319acbbeafSnn case FASTTRAP_INT: 5329acbbeafSnn /* 5339acbbeafSnn * Interrupts seem like they could be traced with 5349acbbeafSnn * no negative implications, but it's possible that 5359acbbeafSnn * a thread could be redirected by the trap handling 5369acbbeafSnn * code which would eventually return to the 5379acbbeafSnn * instruction after the interrupt. If the interrupt 5389acbbeafSnn * were in our scratch space, the subsequent 5399acbbeafSnn * instruction might be overwritten before we return. 5409acbbeafSnn * Accordingly we refuse to instrument any interrupt. 5419acbbeafSnn */ 5429acbbeafSnn return (-1); 5437c478bd9Sstevel@tonic-gate } 5447c478bd9Sstevel@tonic-gate } 5457c478bd9Sstevel@tonic-gate 5467c478bd9Sstevel@tonic-gate #ifdef __amd64 5477c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64 && tp->ftt_type == FASTTRAP_T_COMMON) { 5487c478bd9Sstevel@tonic-gate /* 5497c478bd9Sstevel@tonic-gate * If the process is 64-bit and the instruction type is still 5507c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON -- meaning we're going to copy it out an 5517c478bd9Sstevel@tonic-gate * execute it -- we need to watch for %rip-relative 5527c478bd9Sstevel@tonic-gate * addressing mode. See the portion of fasttrap_pid_probe() 5537c478bd9Sstevel@tonic-gate * below where we handle tracepoints with type 5547c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON for how we emulate instructions that 5557c478bd9Sstevel@tonic-gate * employ %rip-relative addressing. 5567c478bd9Sstevel@tonic-gate */ 5577c478bd9Sstevel@tonic-gate if (rmindex != -1) { 5587c478bd9Sstevel@tonic-gate uint_t mod = FASTTRAP_MODRM_MOD(instr[rmindex]); 5597c478bd9Sstevel@tonic-gate uint_t reg = FASTTRAP_MODRM_REG(instr[rmindex]); 5607c478bd9Sstevel@tonic-gate uint_t rm = FASTTRAP_MODRM_RM(instr[rmindex]); 5617c478bd9Sstevel@tonic-gate 5627c478bd9Sstevel@tonic-gate ASSERT(rmindex > start); 5637c478bd9Sstevel@tonic-gate 5647c478bd9Sstevel@tonic-gate if (mod == 0 && rm == 5) { 5657c478bd9Sstevel@tonic-gate /* 5667c478bd9Sstevel@tonic-gate * We need to be sure to avoid other 5677c478bd9Sstevel@tonic-gate * registers used by this instruction. While 5687c478bd9Sstevel@tonic-gate * the reg field may determine the op code 5697c478bd9Sstevel@tonic-gate * rather than denoting a register, assuming 5707c478bd9Sstevel@tonic-gate * that it denotes a register is always safe. 5717c478bd9Sstevel@tonic-gate * We leave the REX field intact and use 5727c478bd9Sstevel@tonic-gate * whatever value's there for simplicity. 5737c478bd9Sstevel@tonic-gate */ 5747c478bd9Sstevel@tonic-gate if (reg != 0) { 5757c478bd9Sstevel@tonic-gate tp->ftt_ripmode = FASTTRAP_RIP_1 | 5767c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_X * 5777c478bd9Sstevel@tonic-gate FASTTRAP_REX_B(rex)); 5787c478bd9Sstevel@tonic-gate rm = 0; 5797c478bd9Sstevel@tonic-gate } else { 5807c478bd9Sstevel@tonic-gate tp->ftt_ripmode = FASTTRAP_RIP_2 | 5817c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_X * 5827c478bd9Sstevel@tonic-gate FASTTRAP_REX_B(rex)); 5837c478bd9Sstevel@tonic-gate rm = 1; 5847c478bd9Sstevel@tonic-gate } 5857c478bd9Sstevel@tonic-gate 5867c478bd9Sstevel@tonic-gate tp->ftt_modrm = tp->ftt_instr[rmindex]; 5877c478bd9Sstevel@tonic-gate tp->ftt_instr[rmindex] = 5887c478bd9Sstevel@tonic-gate FASTTRAP_MODRM(2, reg, rm); 5897c478bd9Sstevel@tonic-gate } 5907c478bd9Sstevel@tonic-gate } 5917c478bd9Sstevel@tonic-gate } 5927c478bd9Sstevel@tonic-gate #endif 5937c478bd9Sstevel@tonic-gate 5947c478bd9Sstevel@tonic-gate return (0); 5957c478bd9Sstevel@tonic-gate } 5967c478bd9Sstevel@tonic-gate 5977c478bd9Sstevel@tonic-gate int 5987c478bd9Sstevel@tonic-gate fasttrap_tracepoint_install(proc_t *p, fasttrap_tracepoint_t *tp) 5997c478bd9Sstevel@tonic-gate { 6007c478bd9Sstevel@tonic-gate fasttrap_instr_t instr = FASTTRAP_INSTR; 6017c478bd9Sstevel@tonic-gate 6027c478bd9Sstevel@tonic-gate if (uwrite(p, &instr, 1, tp->ftt_pc) != 0) 6037c478bd9Sstevel@tonic-gate return (-1); 6047c478bd9Sstevel@tonic-gate 6057c478bd9Sstevel@tonic-gate return (0); 6067c478bd9Sstevel@tonic-gate } 6077c478bd9Sstevel@tonic-gate 6087c478bd9Sstevel@tonic-gate int 6097c478bd9Sstevel@tonic-gate fasttrap_tracepoint_remove(proc_t *p, fasttrap_tracepoint_t *tp) 6107c478bd9Sstevel@tonic-gate { 6117c478bd9Sstevel@tonic-gate uint8_t instr; 6127c478bd9Sstevel@tonic-gate 6137c478bd9Sstevel@tonic-gate /* 6147c478bd9Sstevel@tonic-gate * Distinguish between read or write failures and a changed 6157c478bd9Sstevel@tonic-gate * instruction. 6167c478bd9Sstevel@tonic-gate */ 6177c478bd9Sstevel@tonic-gate if (uread(p, &instr, 1, tp->ftt_pc) != 0) 6187c478bd9Sstevel@tonic-gate return (0); 6197c478bd9Sstevel@tonic-gate if (instr != FASTTRAP_INSTR) 6207c478bd9Sstevel@tonic-gate return (0); 6217c478bd9Sstevel@tonic-gate if (uwrite(p, &tp->ftt_instr[0], 1, tp->ftt_pc) != 0) 6227c478bd9Sstevel@tonic-gate return (-1); 6237c478bd9Sstevel@tonic-gate 6247c478bd9Sstevel@tonic-gate return (0); 6257c478bd9Sstevel@tonic-gate } 6267c478bd9Sstevel@tonic-gate 6277c478bd9Sstevel@tonic-gate static uintptr_t 6287c478bd9Sstevel@tonic-gate fasttrap_fulword_noerr(const void *uaddr) 6297c478bd9Sstevel@tonic-gate { 6307c478bd9Sstevel@tonic-gate uintptr_t ret; 6317c478bd9Sstevel@tonic-gate 6327c478bd9Sstevel@tonic-gate if (fasttrap_fulword(uaddr, &ret) == 0) 6337c478bd9Sstevel@tonic-gate return (ret); 6347c478bd9Sstevel@tonic-gate 6357c478bd9Sstevel@tonic-gate return (0); 6367c478bd9Sstevel@tonic-gate } 6377c478bd9Sstevel@tonic-gate 6387c478bd9Sstevel@tonic-gate static uint32_t 6397c478bd9Sstevel@tonic-gate fasttrap_fuword32_noerr(const void *uaddr) 6407c478bd9Sstevel@tonic-gate { 6417c478bd9Sstevel@tonic-gate uint32_t ret; 6427c478bd9Sstevel@tonic-gate 6437c478bd9Sstevel@tonic-gate if (fasttrap_fuword32(uaddr, &ret) == 0) 6447c478bd9Sstevel@tonic-gate return (ret); 6457c478bd9Sstevel@tonic-gate 6467c478bd9Sstevel@tonic-gate return (0); 6477c478bd9Sstevel@tonic-gate } 6487c478bd9Sstevel@tonic-gate 6497c478bd9Sstevel@tonic-gate static void 6507c478bd9Sstevel@tonic-gate fasttrap_return_common(struct regs *rp, uintptr_t pc, pid_t pid, 6517c478bd9Sstevel@tonic-gate uintptr_t new_pc) 6527c478bd9Sstevel@tonic-gate { 6537c478bd9Sstevel@tonic-gate fasttrap_tracepoint_t *tp; 6547c478bd9Sstevel@tonic-gate fasttrap_bucket_t *bucket; 6557c478bd9Sstevel@tonic-gate fasttrap_id_t *id; 6567c478bd9Sstevel@tonic-gate kmutex_t *pid_mtx; 6577c478bd9Sstevel@tonic-gate 6587c478bd9Sstevel@tonic-gate pid_mtx = &cpu_core[CPU->cpu_id].cpuc_pid_lock; 6597c478bd9Sstevel@tonic-gate mutex_enter(pid_mtx); 6607c478bd9Sstevel@tonic-gate bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)]; 6617c478bd9Sstevel@tonic-gate 6627c478bd9Sstevel@tonic-gate for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) { 6637c478bd9Sstevel@tonic-gate if (pid == tp->ftt_pid && pc == tp->ftt_pc && 664b096140dSahl !tp->ftt_proc->ftpc_defunct) 6657c478bd9Sstevel@tonic-gate break; 6667c478bd9Sstevel@tonic-gate } 6677c478bd9Sstevel@tonic-gate 6687c478bd9Sstevel@tonic-gate /* 6697c478bd9Sstevel@tonic-gate * Don't sweat it if we can't find the tracepoint again; unlike 6707c478bd9Sstevel@tonic-gate * when we're in fasttrap_pid_probe(), finding the tracepoint here 6717c478bd9Sstevel@tonic-gate * is not essential to the correct execution of the process. 6727c478bd9Sstevel@tonic-gate */ 6737c478bd9Sstevel@tonic-gate if (tp == NULL) { 6747c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx); 6757c478bd9Sstevel@tonic-gate return; 6767c478bd9Sstevel@tonic-gate } 6777c478bd9Sstevel@tonic-gate 6787c478bd9Sstevel@tonic-gate for (id = tp->ftt_retids; id != NULL; id = id->fti_next) { 6797c478bd9Sstevel@tonic-gate /* 6807c478bd9Sstevel@tonic-gate * If there's a branch that could act as a return site, we 6817c478bd9Sstevel@tonic-gate * need to trace it, and check here if the program counter is 6827c478bd9Sstevel@tonic-gate * external to the function. 6837c478bd9Sstevel@tonic-gate */ 6847c478bd9Sstevel@tonic-gate if (tp->ftt_type != FASTTRAP_T_RET && 6857c478bd9Sstevel@tonic-gate tp->ftt_type != FASTTRAP_T_RET16 && 6867c478bd9Sstevel@tonic-gate new_pc - id->fti_probe->ftp_faddr < 6877c478bd9Sstevel@tonic-gate id->fti_probe->ftp_fsize) 6887c478bd9Sstevel@tonic-gate continue; 6897c478bd9Sstevel@tonic-gate 6907c478bd9Sstevel@tonic-gate dtrace_probe(id->fti_probe->ftp_id, 6917c478bd9Sstevel@tonic-gate pc - id->fti_probe->ftp_faddr, 6927c478bd9Sstevel@tonic-gate rp->r_r0, rp->r_r1, 0, 0); 6937c478bd9Sstevel@tonic-gate } 6947c478bd9Sstevel@tonic-gate 6957c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx); 6967c478bd9Sstevel@tonic-gate } 6977c478bd9Sstevel@tonic-gate 6987c478bd9Sstevel@tonic-gate static void 6997c478bd9Sstevel@tonic-gate fasttrap_sigsegv(proc_t *p, kthread_t *t, uintptr_t addr) 7007c478bd9Sstevel@tonic-gate { 7017c478bd9Sstevel@tonic-gate sigqueue_t *sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP); 7027c478bd9Sstevel@tonic-gate 7037c478bd9Sstevel@tonic-gate sqp->sq_info.si_signo = SIGSEGV; 7047c478bd9Sstevel@tonic-gate sqp->sq_info.si_code = SEGV_MAPERR; 7057c478bd9Sstevel@tonic-gate sqp->sq_info.si_addr = (caddr_t)addr; 7067c478bd9Sstevel@tonic-gate 7077c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 7087c478bd9Sstevel@tonic-gate sigaddqa(p, t, sqp); 7097c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 7107c478bd9Sstevel@tonic-gate 7117c478bd9Sstevel@tonic-gate if (t != NULL) 7127c478bd9Sstevel@tonic-gate aston(t); 7137c478bd9Sstevel@tonic-gate } 7147c478bd9Sstevel@tonic-gate 7157c478bd9Sstevel@tonic-gate #ifdef __amd64 7167c478bd9Sstevel@tonic-gate static void 7177c478bd9Sstevel@tonic-gate fasttrap_usdt_args64(fasttrap_probe_t *probe, struct regs *rp, int argc, 7187c478bd9Sstevel@tonic-gate uintptr_t *argv) 7197c478bd9Sstevel@tonic-gate { 7207c478bd9Sstevel@tonic-gate int i, x, cap = MIN(argc, probe->ftp_nargs); 7217c478bd9Sstevel@tonic-gate uintptr_t *stack = (uintptr_t *)rp->r_sp; 7227c478bd9Sstevel@tonic-gate 7237c478bd9Sstevel@tonic-gate for (i = 0; i < cap; i++) { 7247c478bd9Sstevel@tonic-gate x = probe->ftp_argmap[i]; 7257c478bd9Sstevel@tonic-gate 7267c478bd9Sstevel@tonic-gate if (x < 6) 7277c478bd9Sstevel@tonic-gate argv[i] = (&rp->r_rdi)[x]; 7287c478bd9Sstevel@tonic-gate else 7297c478bd9Sstevel@tonic-gate argv[i] = fasttrap_fulword_noerr(&stack[x]); 7307c478bd9Sstevel@tonic-gate } 7317c478bd9Sstevel@tonic-gate 7327c478bd9Sstevel@tonic-gate for (; i < argc; i++) { 7337c478bd9Sstevel@tonic-gate argv[i] = 0; 7347c478bd9Sstevel@tonic-gate } 7357c478bd9Sstevel@tonic-gate } 7367c478bd9Sstevel@tonic-gate #endif 7377c478bd9Sstevel@tonic-gate 7387c478bd9Sstevel@tonic-gate static void 7397c478bd9Sstevel@tonic-gate fasttrap_usdt_args32(fasttrap_probe_t *probe, struct regs *rp, int argc, 7407c478bd9Sstevel@tonic-gate uint32_t *argv) 7417c478bd9Sstevel@tonic-gate { 7427c478bd9Sstevel@tonic-gate int i, x, cap = MIN(argc, probe->ftp_nargs); 7437c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp; 7447c478bd9Sstevel@tonic-gate 7457c478bd9Sstevel@tonic-gate for (i = 0; i < cap; i++) { 7467c478bd9Sstevel@tonic-gate x = probe->ftp_argmap[i]; 7477c478bd9Sstevel@tonic-gate 7487c478bd9Sstevel@tonic-gate argv[i] = fasttrap_fuword32_noerr(&stack[x]); 7497c478bd9Sstevel@tonic-gate } 7507c478bd9Sstevel@tonic-gate 7517c478bd9Sstevel@tonic-gate for (; i < argc; i++) { 7527c478bd9Sstevel@tonic-gate argv[i] = 0; 7537c478bd9Sstevel@tonic-gate } 7547c478bd9Sstevel@tonic-gate } 7557c478bd9Sstevel@tonic-gate 7569acbbeafSnn static int 7579acbbeafSnn fasttrap_do_seg(fasttrap_tracepoint_t *tp, struct regs *rp, uintptr_t *addr) 7589acbbeafSnn { 7599acbbeafSnn proc_t *p = curproc; 7609acbbeafSnn user_desc_t *desc; 7619acbbeafSnn uint16_t sel, ndx, type; 7629acbbeafSnn uintptr_t limit; 7639acbbeafSnn 7649acbbeafSnn switch (tp->ftt_segment) { 7659acbbeafSnn case FASTTRAP_SEG_CS: 7669acbbeafSnn sel = rp->r_cs; 7679acbbeafSnn break; 7689acbbeafSnn case FASTTRAP_SEG_DS: 7699acbbeafSnn sel = rp->r_ds; 7709acbbeafSnn break; 7719acbbeafSnn case FASTTRAP_SEG_ES: 7729acbbeafSnn sel = rp->r_es; 7739acbbeafSnn break; 7749acbbeafSnn case FASTTRAP_SEG_FS: 7759acbbeafSnn sel = rp->r_fs; 7769acbbeafSnn break; 7779acbbeafSnn case FASTTRAP_SEG_GS: 7789acbbeafSnn sel = rp->r_gs; 7799acbbeafSnn break; 7809acbbeafSnn case FASTTRAP_SEG_SS: 7819acbbeafSnn sel = rp->r_ss; 7829acbbeafSnn break; 7839acbbeafSnn } 7849acbbeafSnn 7859acbbeafSnn /* 7869acbbeafSnn * Make sure the given segment register specifies a user priority 7879acbbeafSnn * selector rather than a kernel selector. 7889acbbeafSnn */ 7899acbbeafSnn if (!SELISUPL(sel)) 7909acbbeafSnn return (-1); 7919acbbeafSnn 7929acbbeafSnn ndx = SELTOIDX(sel); 7939acbbeafSnn 7949acbbeafSnn /* 7959acbbeafSnn * Check the bounds and grab the descriptor out of the specified 7969acbbeafSnn * descriptor table. 7979acbbeafSnn */ 7989acbbeafSnn if (SELISLDT(sel)) { 7999acbbeafSnn if (ndx > p->p_ldtlimit) 8009acbbeafSnn return (-1); 8019acbbeafSnn 8029acbbeafSnn desc = p->p_ldt + ndx; 8039acbbeafSnn 8049acbbeafSnn } else { 8059acbbeafSnn if (ndx >= NGDT) 8069acbbeafSnn return (-1); 8079acbbeafSnn 8089acbbeafSnn desc = cpu_get_gdt() + ndx; 8099acbbeafSnn } 8109acbbeafSnn 8119acbbeafSnn /* 8129acbbeafSnn * The descriptor must have user privilege level and it must be 8139acbbeafSnn * present in memory. 8149acbbeafSnn */ 8159acbbeafSnn if (desc->usd_dpl != SEL_UPL || desc->usd_p != 1) 8169acbbeafSnn return (-1); 8179acbbeafSnn 8189acbbeafSnn type = desc->usd_type; 8199acbbeafSnn 8209acbbeafSnn /* 8219acbbeafSnn * If the S bit in the type field is not set, this descriptor can 8229acbbeafSnn * only be used in system context. 8239acbbeafSnn */ 8249acbbeafSnn if ((type & 0x10) != 0x10) 8259acbbeafSnn return (-1); 8269acbbeafSnn 8279acbbeafSnn limit = USEGD_GETLIMIT(desc) * (desc->usd_gran ? PAGESIZE : 1); 8289acbbeafSnn 8299acbbeafSnn if (tp->ftt_segment == FASTTRAP_SEG_CS) { 8309acbbeafSnn /* 8319acbbeafSnn * The code/data bit and readable bit must both be set. 8329acbbeafSnn */ 8339acbbeafSnn if ((type & 0xa) != 0xa) 8349acbbeafSnn return (-1); 8359acbbeafSnn 8369acbbeafSnn if (*addr > limit) 8379acbbeafSnn return (-1); 8389acbbeafSnn } else { 8399acbbeafSnn /* 8409acbbeafSnn * The code/data bit must be clear. 8419acbbeafSnn */ 8429acbbeafSnn if ((type & 0x8) != 0) 8439acbbeafSnn return (-1); 8449acbbeafSnn 8459acbbeafSnn /* 8469acbbeafSnn * If the expand-down bit is clear, we just check the limit as 8479acbbeafSnn * it would naturally be applied. Otherwise, we need to check 8489acbbeafSnn * that the address is the range [limit + 1 .. 0xffff] or 8499acbbeafSnn * [limit + 1 ... 0xffffffff] depending on if the default 8509acbbeafSnn * operand size bit is set. 8519acbbeafSnn */ 8529acbbeafSnn if ((type & 0x4) == 0) { 8539acbbeafSnn if (*addr > limit) 8549acbbeafSnn return (-1); 8559acbbeafSnn } else if (desc->usd_def32) { 8569acbbeafSnn if (*addr < limit + 1 || 0xffff < *addr) 8579acbbeafSnn return (-1); 8589acbbeafSnn } else { 8599acbbeafSnn if (*addr < limit + 1 || 0xffffffff < *addr) 8609acbbeafSnn return (-1); 8619acbbeafSnn } 8629acbbeafSnn } 8639acbbeafSnn 8649acbbeafSnn *addr += USEGD_GETBASE(desc); 8659acbbeafSnn 8669acbbeafSnn return (0); 8679acbbeafSnn } 8689acbbeafSnn 8697c478bd9Sstevel@tonic-gate int 8707c478bd9Sstevel@tonic-gate fasttrap_pid_probe(struct regs *rp) 8717c478bd9Sstevel@tonic-gate { 8727c478bd9Sstevel@tonic-gate proc_t *p = curproc; 8737c478bd9Sstevel@tonic-gate uintptr_t pc = rp->r_pc - 1, new_pc = 0; 8747c478bd9Sstevel@tonic-gate fasttrap_bucket_t *bucket; 8757c478bd9Sstevel@tonic-gate kmutex_t *pid_mtx; 8767c478bd9Sstevel@tonic-gate fasttrap_tracepoint_t *tp, tp_local; 8777c478bd9Sstevel@tonic-gate pid_t pid; 8787c478bd9Sstevel@tonic-gate dtrace_icookie_t cookie; 879ac448965Sahl uint_t is_enabled = 0; 8807c478bd9Sstevel@tonic-gate 8817c478bd9Sstevel@tonic-gate /* 8827c478bd9Sstevel@tonic-gate * It's possible that a user (in a veritable orgy of bad planning) 8837c478bd9Sstevel@tonic-gate * could redirect this thread's flow of control before it reached the 8847c478bd9Sstevel@tonic-gate * return probe fasttrap. In this case we need to kill the process 8857c478bd9Sstevel@tonic-gate * since it's in a unrecoverable state. 8867c478bd9Sstevel@tonic-gate */ 8877c478bd9Sstevel@tonic-gate if (curthread->t_dtrace_step) { 8887c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_on); 8897c478bd9Sstevel@tonic-gate fasttrap_sigtrap(p, curthread, pc); 8907c478bd9Sstevel@tonic-gate return (0); 8917c478bd9Sstevel@tonic-gate } 8927c478bd9Sstevel@tonic-gate 8937c478bd9Sstevel@tonic-gate /* 8947c478bd9Sstevel@tonic-gate * Clear all user tracing flags. 8957c478bd9Sstevel@tonic-gate */ 8967c478bd9Sstevel@tonic-gate curthread->t_dtrace_ft = 0; 8977c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = 0; 8987c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = 0; 8997c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = 0; 9007c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = 0; 9017c478bd9Sstevel@tonic-gate #ifdef __amd64 9027c478bd9Sstevel@tonic-gate curthread->t_dtrace_regv = 0; 9037c478bd9Sstevel@tonic-gate #endif 9047c478bd9Sstevel@tonic-gate 9057c478bd9Sstevel@tonic-gate /* 9067c478bd9Sstevel@tonic-gate * Treat a child created by a call to vfork(2) as if it were its 9077c478bd9Sstevel@tonic-gate * parent. We know that there's only one thread of control in such a 9087c478bd9Sstevel@tonic-gate * process: this one. 9097c478bd9Sstevel@tonic-gate */ 9107c478bd9Sstevel@tonic-gate while (p->p_flag & SVFORK) { 9117c478bd9Sstevel@tonic-gate p = p->p_parent; 9127c478bd9Sstevel@tonic-gate } 9137c478bd9Sstevel@tonic-gate 9147c478bd9Sstevel@tonic-gate pid = p->p_pid; 9157c478bd9Sstevel@tonic-gate pid_mtx = &cpu_core[CPU->cpu_id].cpuc_pid_lock; 9167c478bd9Sstevel@tonic-gate mutex_enter(pid_mtx); 9177c478bd9Sstevel@tonic-gate bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)]; 9187c478bd9Sstevel@tonic-gate 9197c478bd9Sstevel@tonic-gate /* 9207c478bd9Sstevel@tonic-gate * Lookup the tracepoint that the process just hit. 9217c478bd9Sstevel@tonic-gate */ 9227c478bd9Sstevel@tonic-gate for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) { 9237c478bd9Sstevel@tonic-gate if (pid == tp->ftt_pid && pc == tp->ftt_pc && 924b096140dSahl !tp->ftt_proc->ftpc_defunct) 9257c478bd9Sstevel@tonic-gate break; 9267c478bd9Sstevel@tonic-gate } 9277c478bd9Sstevel@tonic-gate 9287c478bd9Sstevel@tonic-gate /* 9297c478bd9Sstevel@tonic-gate * If we couldn't find a matching tracepoint, either a tracepoint has 9307c478bd9Sstevel@tonic-gate * been inserted without using the pid<pid> ioctl interface (see 9317c478bd9Sstevel@tonic-gate * fasttrap_ioctl), or somehow we have mislaid this tracepoint. 9327c478bd9Sstevel@tonic-gate */ 9337c478bd9Sstevel@tonic-gate if (tp == NULL) { 9347c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx); 9357c478bd9Sstevel@tonic-gate return (-1); 9367c478bd9Sstevel@tonic-gate } 9377c478bd9Sstevel@tonic-gate 9387c478bd9Sstevel@tonic-gate /* 9397c478bd9Sstevel@tonic-gate * Set the program counter to the address of the traced instruction 9407c478bd9Sstevel@tonic-gate * so that it looks right in ustack() output. 9417c478bd9Sstevel@tonic-gate */ 9427c478bd9Sstevel@tonic-gate rp->r_pc = pc; 9437c478bd9Sstevel@tonic-gate 9447c478bd9Sstevel@tonic-gate if (tp->ftt_ids != NULL) { 9457c478bd9Sstevel@tonic-gate fasttrap_id_t *id; 9467c478bd9Sstevel@tonic-gate 9477c478bd9Sstevel@tonic-gate #ifdef __amd64 9487c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) { 9497c478bd9Sstevel@tonic-gate for (id = tp->ftt_ids; id != NULL; id = id->fti_next) { 9507c478bd9Sstevel@tonic-gate fasttrap_probe_t *probe = id->fti_probe; 9517c478bd9Sstevel@tonic-gate 952ac448965Sahl if (id->fti_ptype == DTFTP_ENTRY) { 9537c478bd9Sstevel@tonic-gate /* 9547c478bd9Sstevel@tonic-gate * We note that this was an entry 9557c478bd9Sstevel@tonic-gate * probe to help ustack() find the 9567c478bd9Sstevel@tonic-gate * first caller. 9577c478bd9Sstevel@tonic-gate */ 9587c478bd9Sstevel@tonic-gate cookie = dtrace_interrupt_disable(); 9597c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_ENTRY); 9607c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, rp->r_rdi, 9617c478bd9Sstevel@tonic-gate rp->r_rsi, rp->r_rdx, rp->r_rcx, 9627c478bd9Sstevel@tonic-gate rp->r_r8); 9637c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_ENTRY); 9647c478bd9Sstevel@tonic-gate dtrace_interrupt_enable(cookie); 965ac448965Sahl } else if (id->fti_ptype == DTFTP_IS_ENABLED) { 966ac448965Sahl /* 967ac448965Sahl * Note that in this case, we don't 968ac448965Sahl * call dtrace_probe() since it's only 969ac448965Sahl * an artificial probe meant to change 970ac448965Sahl * the flow of control so that it 971ac448965Sahl * encounters the true probe. 972ac448965Sahl */ 973ac448965Sahl is_enabled = 1; 9747c478bd9Sstevel@tonic-gate } else if (probe->ftp_argmap == NULL) { 9757c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, rp->r_rdi, 9767c478bd9Sstevel@tonic-gate rp->r_rsi, rp->r_rdx, rp->r_rcx, 9777c478bd9Sstevel@tonic-gate rp->r_r8); 9787c478bd9Sstevel@tonic-gate } else { 9797c478bd9Sstevel@tonic-gate uintptr_t t[5]; 9807c478bd9Sstevel@tonic-gate 9817c478bd9Sstevel@tonic-gate fasttrap_usdt_args64(probe, rp, 9827c478bd9Sstevel@tonic-gate sizeof (t) / sizeof (t[0]), t); 9837c478bd9Sstevel@tonic-gate 9847c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, t[0], t[1], 9857c478bd9Sstevel@tonic-gate t[2], t[3], t[4]); 9867c478bd9Sstevel@tonic-gate } 9877c478bd9Sstevel@tonic-gate } 9887c478bd9Sstevel@tonic-gate } else { 9897c478bd9Sstevel@tonic-gate #endif 9907c478bd9Sstevel@tonic-gate uintptr_t s0, s1, s2, s3, s4, s5; 9917c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp; 9927c478bd9Sstevel@tonic-gate 9937c478bd9Sstevel@tonic-gate /* 9947c478bd9Sstevel@tonic-gate * In 32-bit mode, all arguments are passed on the 9957c478bd9Sstevel@tonic-gate * stack. If this is a function entry probe, we need 9967c478bd9Sstevel@tonic-gate * to skip the first entry on the stack as it 9977c478bd9Sstevel@tonic-gate * represents the return address rather than a 9987c478bd9Sstevel@tonic-gate * parameter to the function. 9997c478bd9Sstevel@tonic-gate */ 10007c478bd9Sstevel@tonic-gate s0 = fasttrap_fuword32_noerr(&stack[0]); 10017c478bd9Sstevel@tonic-gate s1 = fasttrap_fuword32_noerr(&stack[1]); 10027c478bd9Sstevel@tonic-gate s2 = fasttrap_fuword32_noerr(&stack[2]); 10037c478bd9Sstevel@tonic-gate s3 = fasttrap_fuword32_noerr(&stack[3]); 10047c478bd9Sstevel@tonic-gate s4 = fasttrap_fuword32_noerr(&stack[4]); 10057c478bd9Sstevel@tonic-gate s5 = fasttrap_fuword32_noerr(&stack[5]); 10067c478bd9Sstevel@tonic-gate 10077c478bd9Sstevel@tonic-gate for (id = tp->ftt_ids; id != NULL; id = id->fti_next) { 10087c478bd9Sstevel@tonic-gate fasttrap_probe_t *probe = id->fti_probe; 10097c478bd9Sstevel@tonic-gate 1010ac448965Sahl if (id->fti_ptype == DTFTP_ENTRY) { 10117c478bd9Sstevel@tonic-gate /* 10127c478bd9Sstevel@tonic-gate * We note that this was an entry 10137c478bd9Sstevel@tonic-gate * probe to help ustack() find the 10147c478bd9Sstevel@tonic-gate * first caller. 10157c478bd9Sstevel@tonic-gate */ 10167c478bd9Sstevel@tonic-gate cookie = dtrace_interrupt_disable(); 10177c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_ENTRY); 10187c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, s1, s2, 10197c478bd9Sstevel@tonic-gate s3, s4, s5); 10207c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_ENTRY); 10217c478bd9Sstevel@tonic-gate dtrace_interrupt_enable(cookie); 1022ac448965Sahl } else if (id->fti_ptype == DTFTP_IS_ENABLED) { 1023ac448965Sahl /* 1024ac448965Sahl * Note that in this case, we don't 1025ac448965Sahl * call dtrace_probe() since it's only 1026ac448965Sahl * an artificial probe meant to change 1027ac448965Sahl * the flow of control so that it 1028ac448965Sahl * encounters the true probe. 1029ac448965Sahl */ 1030ac448965Sahl is_enabled = 1; 10317c478bd9Sstevel@tonic-gate } else if (probe->ftp_argmap == NULL) { 10327c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, s0, s1, 10337c478bd9Sstevel@tonic-gate s2, s3, s4); 10347c478bd9Sstevel@tonic-gate } else { 10357c478bd9Sstevel@tonic-gate uint32_t t[5]; 10367c478bd9Sstevel@tonic-gate 10377c478bd9Sstevel@tonic-gate fasttrap_usdt_args32(probe, rp, 10387c478bd9Sstevel@tonic-gate sizeof (t) / sizeof (t[0]), t); 10397c478bd9Sstevel@tonic-gate 10407c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, t[0], t[1], 10417c478bd9Sstevel@tonic-gate t[2], t[3], t[4]); 10427c478bd9Sstevel@tonic-gate } 10437c478bd9Sstevel@tonic-gate } 10447c478bd9Sstevel@tonic-gate #ifdef __amd64 10457c478bd9Sstevel@tonic-gate } 10467c478bd9Sstevel@tonic-gate #endif 10477c478bd9Sstevel@tonic-gate } 10487c478bd9Sstevel@tonic-gate 10497c478bd9Sstevel@tonic-gate /* 10507c478bd9Sstevel@tonic-gate * We're about to do a bunch of work so we cache a local copy of 10517c478bd9Sstevel@tonic-gate * the tracepoint to emulate the instruction, and then find the 10527c478bd9Sstevel@tonic-gate * tracepoint again later if we need to light up any return probes. 10537c478bd9Sstevel@tonic-gate */ 10547c478bd9Sstevel@tonic-gate tp_local = *tp; 10557c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx); 10567c478bd9Sstevel@tonic-gate tp = &tp_local; 10577c478bd9Sstevel@tonic-gate 10587c478bd9Sstevel@tonic-gate /* 10597c478bd9Sstevel@tonic-gate * Set the program counter to appear as though the traced instruction 10607c478bd9Sstevel@tonic-gate * had completely executed. This ensures that fasttrap_getreg() will 10617c478bd9Sstevel@tonic-gate * report the expected value for REG_RIP. 10627c478bd9Sstevel@tonic-gate */ 10637c478bd9Sstevel@tonic-gate rp->r_pc = pc + tp->ftt_size; 10647c478bd9Sstevel@tonic-gate 1065ac448965Sahl /* 1066ac448965Sahl * If there's an is-enabled probe connected to this tracepoint it 1067ac448965Sahl * means that there was a 'xorl %eax, %eax' or 'xorq %rax, %rax' 1068ac448965Sahl * instruction that was placed there by DTrace when the binary was 1069ac448965Sahl * linked. As this probe is, in fact, enabled, we need to stuff 1 1070ac448965Sahl * into %eax or %rax. Accordingly, we can bypass all the instruction 1071ac448965Sahl * emulation logic since we know the inevitable result. It's possible 1072ac448965Sahl * that a user could construct a scenario where the 'is-enabled' 1073ac448965Sahl * probe was on some other instruction, but that would be a rather 1074ac448965Sahl * exotic way to shoot oneself in the foot. 1075ac448965Sahl */ 1076ac448965Sahl if (is_enabled) { 1077ac448965Sahl rp->r_r0 = 1; 1078ac448965Sahl new_pc = rp->r_pc; 1079ac448965Sahl goto done; 1080ac448965Sahl } 1081ac448965Sahl 1082ac448965Sahl /* 1083ac448965Sahl * We emulate certain types of instructions to ensure correctness 1084ac448965Sahl * (in the case of position dependent instructions) or optimize 1085ac448965Sahl * common cases. The rest we have the thread execute back in user- 1086ac448965Sahl * land. 1087ac448965Sahl */ 10887c478bd9Sstevel@tonic-gate switch (tp->ftt_type) { 10897c478bd9Sstevel@tonic-gate case FASTTRAP_T_RET: 10907c478bd9Sstevel@tonic-gate case FASTTRAP_T_RET16: 10917c478bd9Sstevel@tonic-gate { 10927c478bd9Sstevel@tonic-gate uintptr_t dst; 10937c478bd9Sstevel@tonic-gate uintptr_t addr; 10947c478bd9Sstevel@tonic-gate int ret; 10957c478bd9Sstevel@tonic-gate 10967c478bd9Sstevel@tonic-gate /* 10977c478bd9Sstevel@tonic-gate * We have to emulate _every_ facet of the behavior of a ret 10987c478bd9Sstevel@tonic-gate * instruction including what happens if the load from %esp 10997c478bd9Sstevel@tonic-gate * fails; in that case, we send a SIGSEGV. 11007c478bd9Sstevel@tonic-gate */ 11017c478bd9Sstevel@tonic-gate #ifdef __amd64 11027c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) { 11037c478bd9Sstevel@tonic-gate #endif 11047c478bd9Sstevel@tonic-gate ret = fasttrap_fulword((void *)rp->r_sp, &dst); 11057c478bd9Sstevel@tonic-gate addr = rp->r_sp + sizeof (uintptr_t); 11067c478bd9Sstevel@tonic-gate #ifdef __amd64 11077c478bd9Sstevel@tonic-gate } else { 11087c478bd9Sstevel@tonic-gate uint32_t dst32; 11097c478bd9Sstevel@tonic-gate ret = fasttrap_fuword32((void *)rp->r_sp, &dst32); 11107c478bd9Sstevel@tonic-gate dst = dst32; 11117c478bd9Sstevel@tonic-gate addr = rp->r_sp + sizeof (uint32_t); 11127c478bd9Sstevel@tonic-gate } 11137c478bd9Sstevel@tonic-gate #endif 11147c478bd9Sstevel@tonic-gate 11157c478bd9Sstevel@tonic-gate if (ret == -1) { 11167c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, rp->r_sp); 11177c478bd9Sstevel@tonic-gate new_pc = pc; 11187c478bd9Sstevel@tonic-gate break; 11197c478bd9Sstevel@tonic-gate } 11207c478bd9Sstevel@tonic-gate 11217c478bd9Sstevel@tonic-gate if (tp->ftt_type == FASTTRAP_T_RET16) 11227c478bd9Sstevel@tonic-gate addr += tp->ftt_dest; 11237c478bd9Sstevel@tonic-gate 11247c478bd9Sstevel@tonic-gate rp->r_sp = addr; 11257c478bd9Sstevel@tonic-gate new_pc = dst; 11267c478bd9Sstevel@tonic-gate break; 11277c478bd9Sstevel@tonic-gate } 11287c478bd9Sstevel@tonic-gate 11297c478bd9Sstevel@tonic-gate case FASTTRAP_T_JCC: 11307c478bd9Sstevel@tonic-gate { 11317c478bd9Sstevel@tonic-gate uint_t taken; 11327c478bd9Sstevel@tonic-gate 11337c478bd9Sstevel@tonic-gate switch (tp->ftt_code) { 11347c478bd9Sstevel@tonic-gate case FASTTRAP_JO: 11357c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_OF) != 0; 11367c478bd9Sstevel@tonic-gate break; 11377c478bd9Sstevel@tonic-gate case FASTTRAP_JNO: 11387c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_OF) == 0; 11397c478bd9Sstevel@tonic-gate break; 11407c478bd9Sstevel@tonic-gate case FASTTRAP_JB: 11417c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) != 0; 11427c478bd9Sstevel@tonic-gate break; 11437c478bd9Sstevel@tonic-gate case FASTTRAP_JAE: 11447c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) == 0; 11457c478bd9Sstevel@tonic-gate break; 11467c478bd9Sstevel@tonic-gate case FASTTRAP_JE: 11477c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0; 11487c478bd9Sstevel@tonic-gate break; 11497c478bd9Sstevel@tonic-gate case FASTTRAP_JNE: 11507c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0; 11517c478bd9Sstevel@tonic-gate break; 11527c478bd9Sstevel@tonic-gate case FASTTRAP_JBE: 11537c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) != 0 || 11547c478bd9Sstevel@tonic-gate (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0; 11557c478bd9Sstevel@tonic-gate break; 11567c478bd9Sstevel@tonic-gate case FASTTRAP_JA: 11577c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) == 0 && 11587c478bd9Sstevel@tonic-gate (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0; 11597c478bd9Sstevel@tonic-gate break; 11607c478bd9Sstevel@tonic-gate case FASTTRAP_JS: 11617c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) != 0; 11627c478bd9Sstevel@tonic-gate break; 11637c478bd9Sstevel@tonic-gate case FASTTRAP_JNS: 11647c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) == 0; 11657c478bd9Sstevel@tonic-gate break; 11667c478bd9Sstevel@tonic-gate case FASTTRAP_JP: 11677c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_PF) != 0; 11687c478bd9Sstevel@tonic-gate break; 11697c478bd9Sstevel@tonic-gate case FASTTRAP_JNP: 11707c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_PF) == 0; 11717c478bd9Sstevel@tonic-gate break; 11727c478bd9Sstevel@tonic-gate case FASTTRAP_JL: 11737c478bd9Sstevel@tonic-gate taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) != 11747c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0); 11757c478bd9Sstevel@tonic-gate break; 11767c478bd9Sstevel@tonic-gate case FASTTRAP_JGE: 11777c478bd9Sstevel@tonic-gate taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) == 11787c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0); 11797c478bd9Sstevel@tonic-gate break; 11807c478bd9Sstevel@tonic-gate case FASTTRAP_JLE: 11817c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0 || 11827c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) != 11837c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0); 11847c478bd9Sstevel@tonic-gate break; 11857c478bd9Sstevel@tonic-gate case FASTTRAP_JG: 11867c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0 && 11877c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) == 11887c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0); 11897c478bd9Sstevel@tonic-gate break; 11907c478bd9Sstevel@tonic-gate 11917c478bd9Sstevel@tonic-gate } 11927c478bd9Sstevel@tonic-gate 11937c478bd9Sstevel@tonic-gate if (taken) 11947c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest; 11957c478bd9Sstevel@tonic-gate else 11967c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size; 11977c478bd9Sstevel@tonic-gate break; 11987c478bd9Sstevel@tonic-gate } 11997c478bd9Sstevel@tonic-gate 12007c478bd9Sstevel@tonic-gate case FASTTRAP_T_LOOP: 12017c478bd9Sstevel@tonic-gate { 12027c478bd9Sstevel@tonic-gate uint_t taken; 12037c478bd9Sstevel@tonic-gate #ifdef __amd64 12047c478bd9Sstevel@tonic-gate greg_t cx = rp->r_rcx--; 12057c478bd9Sstevel@tonic-gate #else 12067c478bd9Sstevel@tonic-gate greg_t cx = rp->r_ecx--; 12077c478bd9Sstevel@tonic-gate #endif 12087c478bd9Sstevel@tonic-gate 12097c478bd9Sstevel@tonic-gate switch (tp->ftt_code) { 12107c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPNZ: 12117c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0 && 12127c478bd9Sstevel@tonic-gate cx != 0; 12137c478bd9Sstevel@tonic-gate break; 12147c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPZ: 12157c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0 && 12167c478bd9Sstevel@tonic-gate cx != 0; 12177c478bd9Sstevel@tonic-gate break; 12187c478bd9Sstevel@tonic-gate case FASTTRAP_LOOP: 12197c478bd9Sstevel@tonic-gate taken = (cx != 0); 12207c478bd9Sstevel@tonic-gate break; 12217c478bd9Sstevel@tonic-gate } 12227c478bd9Sstevel@tonic-gate 12237c478bd9Sstevel@tonic-gate if (taken) 12247c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest; 12257c478bd9Sstevel@tonic-gate else 12267c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size; 12277c478bd9Sstevel@tonic-gate break; 12287c478bd9Sstevel@tonic-gate } 12297c478bd9Sstevel@tonic-gate 12307c478bd9Sstevel@tonic-gate case FASTTRAP_T_JCXZ: 12317c478bd9Sstevel@tonic-gate { 12327c478bd9Sstevel@tonic-gate #ifdef __amd64 12337c478bd9Sstevel@tonic-gate greg_t cx = rp->r_rcx; 12347c478bd9Sstevel@tonic-gate #else 12357c478bd9Sstevel@tonic-gate greg_t cx = rp->r_ecx; 12367c478bd9Sstevel@tonic-gate #endif 12377c478bd9Sstevel@tonic-gate 12387c478bd9Sstevel@tonic-gate if (cx == 0) 12397c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest; 12407c478bd9Sstevel@tonic-gate else 12417c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size; 12427c478bd9Sstevel@tonic-gate break; 12437c478bd9Sstevel@tonic-gate } 12447c478bd9Sstevel@tonic-gate 12457c478bd9Sstevel@tonic-gate case FASTTRAP_T_PUSHL_EBP: 12467c478bd9Sstevel@tonic-gate { 12477c478bd9Sstevel@tonic-gate int ret; 12487c478bd9Sstevel@tonic-gate uintptr_t addr; 12497c478bd9Sstevel@tonic-gate #ifdef __amd64 12507c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) { 12517c478bd9Sstevel@tonic-gate #endif 12527c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uintptr_t); 12537c478bd9Sstevel@tonic-gate ret = fasttrap_sulword((void *)addr, rp->r_fp); 12547c478bd9Sstevel@tonic-gate #ifdef __amd64 12557c478bd9Sstevel@tonic-gate } else { 12567c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uint32_t); 12577c478bd9Sstevel@tonic-gate ret = fasttrap_suword32((void *)addr, 12587c478bd9Sstevel@tonic-gate (uint32_t)rp->r_fp); 12597c478bd9Sstevel@tonic-gate } 12607c478bd9Sstevel@tonic-gate #endif 12617c478bd9Sstevel@tonic-gate 12627c478bd9Sstevel@tonic-gate if (ret == -1) { 12637c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, addr); 12647c478bd9Sstevel@tonic-gate new_pc = pc; 12657c478bd9Sstevel@tonic-gate break; 12667c478bd9Sstevel@tonic-gate } 12677c478bd9Sstevel@tonic-gate 12687c478bd9Sstevel@tonic-gate rp->r_sp = addr; 12697c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size; 12707c478bd9Sstevel@tonic-gate break; 12717c478bd9Sstevel@tonic-gate } 12727c478bd9Sstevel@tonic-gate 1273*2b6e762cSahl case FASTTRAP_T_NOP: 1274*2b6e762cSahl new_pc = pc + tp->ftt_size; 1275*2b6e762cSahl break; 1276*2b6e762cSahl 12777c478bd9Sstevel@tonic-gate case FASTTRAP_T_JMP: 12787c478bd9Sstevel@tonic-gate case FASTTRAP_T_CALL: 12797c478bd9Sstevel@tonic-gate if (tp->ftt_code == 0) { 12807c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest; 12817c478bd9Sstevel@tonic-gate } else { 12829acbbeafSnn uintptr_t value, addr = tp->ftt_dest; 12837c478bd9Sstevel@tonic-gate 12847c478bd9Sstevel@tonic-gate if (tp->ftt_base != FASTTRAP_NOREG) 12857c478bd9Sstevel@tonic-gate addr += fasttrap_getreg(rp, tp->ftt_base); 12867c478bd9Sstevel@tonic-gate if (tp->ftt_index != FASTTRAP_NOREG) 12877c478bd9Sstevel@tonic-gate addr += fasttrap_getreg(rp, tp->ftt_index) << 12887c478bd9Sstevel@tonic-gate tp->ftt_scale; 12897c478bd9Sstevel@tonic-gate 12907c478bd9Sstevel@tonic-gate if (tp->ftt_code == 1) { 12919acbbeafSnn /* 12929acbbeafSnn * If there's a segment prefix for this 12939acbbeafSnn * instruction, we'll need to check permissions 12949acbbeafSnn * and bounds on the given selector, and adjust 12959acbbeafSnn * the address accordingly. 12969acbbeafSnn */ 12979acbbeafSnn if (tp->ftt_segment != FASTTRAP_SEG_NONE && 12989acbbeafSnn fasttrap_do_seg(tp, rp, &addr) != 0) { 12999acbbeafSnn fasttrap_sigsegv(p, curthread, addr); 13009acbbeafSnn new_pc = pc; 13019acbbeafSnn break; 13029acbbeafSnn } 13039acbbeafSnn 13047c478bd9Sstevel@tonic-gate #ifdef __amd64 13057c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) { 13067c478bd9Sstevel@tonic-gate #endif 13077c478bd9Sstevel@tonic-gate if (fasttrap_fulword((void *)addr, 13087c478bd9Sstevel@tonic-gate &value) == -1) { 13097c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, 13107c478bd9Sstevel@tonic-gate addr); 13117c478bd9Sstevel@tonic-gate new_pc = pc; 13127c478bd9Sstevel@tonic-gate break; 13137c478bd9Sstevel@tonic-gate } 13147c478bd9Sstevel@tonic-gate new_pc = value; 13157c478bd9Sstevel@tonic-gate #ifdef __amd64 13167c478bd9Sstevel@tonic-gate } else { 13179acbbeafSnn uint32_t value32; 13189acbbeafSnn addr = (uintptr_t)(uint32_t)addr; 13197c478bd9Sstevel@tonic-gate if (fasttrap_fuword32((void *)addr, 13209acbbeafSnn &value32) == -1) { 13217c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, 13227c478bd9Sstevel@tonic-gate addr); 13237c478bd9Sstevel@tonic-gate new_pc = pc; 13247c478bd9Sstevel@tonic-gate break; 13257c478bd9Sstevel@tonic-gate } 13269acbbeafSnn new_pc = value32; 13277c478bd9Sstevel@tonic-gate } 13287c478bd9Sstevel@tonic-gate #endif 13297c478bd9Sstevel@tonic-gate } else { 13307c478bd9Sstevel@tonic-gate new_pc = addr; 13317c478bd9Sstevel@tonic-gate } 13327c478bd9Sstevel@tonic-gate } 13337c478bd9Sstevel@tonic-gate 13347c478bd9Sstevel@tonic-gate /* 13357c478bd9Sstevel@tonic-gate * If this is a call instruction, we need to push the return 13367c478bd9Sstevel@tonic-gate * address onto the stack. If this fails, we send the process 13377c478bd9Sstevel@tonic-gate * a SIGSEGV and reset the pc to emulate what would happen if 13387c478bd9Sstevel@tonic-gate * this instruction weren't traced. 13397c478bd9Sstevel@tonic-gate */ 13407c478bd9Sstevel@tonic-gate if (tp->ftt_type == FASTTRAP_T_CALL) { 13417c478bd9Sstevel@tonic-gate int ret; 13427c478bd9Sstevel@tonic-gate uintptr_t addr; 13437c478bd9Sstevel@tonic-gate #ifdef __amd64 13447c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) { 13457c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uintptr_t); 13467c478bd9Sstevel@tonic-gate ret = fasttrap_sulword((void *)addr, 13477c478bd9Sstevel@tonic-gate pc + tp->ftt_size); 13487c478bd9Sstevel@tonic-gate } else { 13497c478bd9Sstevel@tonic-gate #endif 13507c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uint32_t); 13517c478bd9Sstevel@tonic-gate ret = fasttrap_suword32((void *)addr, 13527c478bd9Sstevel@tonic-gate (uint32_t)(pc + tp->ftt_size)); 13537c478bd9Sstevel@tonic-gate #ifdef __amd64 13547c478bd9Sstevel@tonic-gate } 13557c478bd9Sstevel@tonic-gate #endif 13567c478bd9Sstevel@tonic-gate 13577c478bd9Sstevel@tonic-gate if (ret == -1) { 13587c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, addr); 13597c478bd9Sstevel@tonic-gate new_pc = pc; 13607c478bd9Sstevel@tonic-gate break; 13617c478bd9Sstevel@tonic-gate } 13627c478bd9Sstevel@tonic-gate 13637c478bd9Sstevel@tonic-gate rp->r_sp = addr; 13647c478bd9Sstevel@tonic-gate } 13657c478bd9Sstevel@tonic-gate 13667c478bd9Sstevel@tonic-gate break; 13677c478bd9Sstevel@tonic-gate 13687c478bd9Sstevel@tonic-gate case FASTTRAP_T_COMMON: 13697c478bd9Sstevel@tonic-gate { 13707c478bd9Sstevel@tonic-gate uintptr_t addr; 13717c478bd9Sstevel@tonic-gate uint8_t scratch[2 * FASTTRAP_MAX_INSTR_SIZE + 5 + 2]; 13727c478bd9Sstevel@tonic-gate uint_t i = 0; 13737c478bd9Sstevel@tonic-gate klwp_t *lwp = ttolwp(curthread); 13747c478bd9Sstevel@tonic-gate 13757c478bd9Sstevel@tonic-gate /* 13767c478bd9Sstevel@tonic-gate * Compute the address of the ulwp_t and step over the 13777c478bd9Sstevel@tonic-gate * ul_self pointer. The method used to store the user-land 13787c478bd9Sstevel@tonic-gate * thread pointer is very different on 32- and 64-bit 13797c478bd9Sstevel@tonic-gate * kernels. 13807c478bd9Sstevel@tonic-gate */ 13817c478bd9Sstevel@tonic-gate #if defined(__amd64) 13827c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) { 13837c478bd9Sstevel@tonic-gate addr = lwp->lwp_pcb.pcb_fsbase; 13847c478bd9Sstevel@tonic-gate addr += sizeof (void *); 13857c478bd9Sstevel@tonic-gate } else { 13867c478bd9Sstevel@tonic-gate addr = lwp->lwp_pcb.pcb_gsbase; 13877c478bd9Sstevel@tonic-gate addr += sizeof (caddr32_t); 13887c478bd9Sstevel@tonic-gate } 13897c478bd9Sstevel@tonic-gate #elif defined(__i386) 13907c478bd9Sstevel@tonic-gate addr = USEGD_GETBASE(&lwp->lwp_pcb.pcb_gsdesc); 13917c478bd9Sstevel@tonic-gate addr += sizeof (void *); 13927c478bd9Sstevel@tonic-gate #endif 13937c478bd9Sstevel@tonic-gate 13947c478bd9Sstevel@tonic-gate /* 13957c478bd9Sstevel@tonic-gate * Generic Instruction Tracing 13967c478bd9Sstevel@tonic-gate * --------------------------- 13977c478bd9Sstevel@tonic-gate * 13987c478bd9Sstevel@tonic-gate * This is the layout of the scratch space in the user-land 13997c478bd9Sstevel@tonic-gate * thread structure for our generated instructions. 14007c478bd9Sstevel@tonic-gate * 14017c478bd9Sstevel@tonic-gate * 32-bit mode bytes 14027c478bd9Sstevel@tonic-gate * ------------------------ ----- 14037c478bd9Sstevel@tonic-gate * a: <original instruction> <= 15 14047c478bd9Sstevel@tonic-gate * jmp <pc + tp->ftt_size> 5 14057c478bd9Sstevel@tonic-gate * b: <original instrction> <= 15 14067c478bd9Sstevel@tonic-gate * int T_DTRACE_RET 2 14077c478bd9Sstevel@tonic-gate * ----- 14087c478bd9Sstevel@tonic-gate * <= 37 14097c478bd9Sstevel@tonic-gate * 14107c478bd9Sstevel@tonic-gate * 64-bit mode bytes 14117c478bd9Sstevel@tonic-gate * ------------------------ ----- 14127c478bd9Sstevel@tonic-gate * a: <original instruction> <= 15 14137c478bd9Sstevel@tonic-gate * jmp 0(%rip) 6 14147c478bd9Sstevel@tonic-gate * <pc + tp->ftt_size> 8 14157c478bd9Sstevel@tonic-gate * b: <original instruction> <= 15 14167c478bd9Sstevel@tonic-gate * int T_DTRACE_RET 2 14177c478bd9Sstevel@tonic-gate * ----- 14187c478bd9Sstevel@tonic-gate * <= 46 14197c478bd9Sstevel@tonic-gate * 14207c478bd9Sstevel@tonic-gate * The %pc is set to a, and curthread->t_dtrace_astpc is set 14217c478bd9Sstevel@tonic-gate * to b. If we encounter a signal on the way out of the 14227c478bd9Sstevel@tonic-gate * kernel, trap() will set %pc to curthread->t_dtrace_astpc 14237c478bd9Sstevel@tonic-gate * so that we execute the original instruction and re-enter 14247c478bd9Sstevel@tonic-gate * the kernel rather than redirecting to the next instruction. 14257c478bd9Sstevel@tonic-gate * 14267c478bd9Sstevel@tonic-gate * If there are return probes (so we know that we're going to 14277c478bd9Sstevel@tonic-gate * need to reenter the kernel after executing the original 14287c478bd9Sstevel@tonic-gate * instruction), the scratch space will just contain the 14297c478bd9Sstevel@tonic-gate * original instruction followed by an interrupt -- the same 14307c478bd9Sstevel@tonic-gate * data as at b. 14317c478bd9Sstevel@tonic-gate * 14327c478bd9Sstevel@tonic-gate * %rip-relative Addressing 14337c478bd9Sstevel@tonic-gate * ------------------------ 14347c478bd9Sstevel@tonic-gate * 14357c478bd9Sstevel@tonic-gate * There's a further complication in 64-bit mode due to %rip- 14367c478bd9Sstevel@tonic-gate * relative addressing. While this is clearly a beneficial 14377c478bd9Sstevel@tonic-gate * architectural decision for position independent code, it's 14387c478bd9Sstevel@tonic-gate * hard not to see it as a personal attack against the pid 14397c478bd9Sstevel@tonic-gate * provider since before there was a relatively small set of 14407c478bd9Sstevel@tonic-gate * instructions to emulate; with %rip-relative addressing, 14417c478bd9Sstevel@tonic-gate * almost every instruction can potentially depend on the 14427c478bd9Sstevel@tonic-gate * address at which it's executed. Rather than emulating 14437c478bd9Sstevel@tonic-gate * the broad spectrum of instructions that can now be 14447c478bd9Sstevel@tonic-gate * position dependent, we emulate jumps and others as in 14457c478bd9Sstevel@tonic-gate * 32-bit mode, and take a different tack for instructions 14467c478bd9Sstevel@tonic-gate * using %rip-relative addressing. 14477c478bd9Sstevel@tonic-gate * 14487c478bd9Sstevel@tonic-gate * For every instruction that uses the ModRM byte, the 14497c478bd9Sstevel@tonic-gate * in-kernel disassembler reports its location. We use the 14507c478bd9Sstevel@tonic-gate * ModRM byte to identify that an instruction uses 14517c478bd9Sstevel@tonic-gate * %rip-relative addressing and to see what other registers 14527c478bd9Sstevel@tonic-gate * the instruction uses. To emulate those instructions, 14537c478bd9Sstevel@tonic-gate * we modify the instruction to be %rax-relative rather than 14547c478bd9Sstevel@tonic-gate * %rip-relative (or %rcx-relative if the instruction uses 14557c478bd9Sstevel@tonic-gate * %rax; or %r8- or %r9-relative if the REX.B is present so 14567c478bd9Sstevel@tonic-gate * we don't have to rewrite the REX prefix). We then load 14577c478bd9Sstevel@tonic-gate * the value that %rip would have been into the scratch 14587c478bd9Sstevel@tonic-gate * register and generate an instruction to reset the scratch 14597c478bd9Sstevel@tonic-gate * register back to its original value. The instruction 14607c478bd9Sstevel@tonic-gate * sequence looks like this: 14617c478bd9Sstevel@tonic-gate * 14627c478bd9Sstevel@tonic-gate * 64-mode %rip-relative bytes 14637c478bd9Sstevel@tonic-gate * ------------------------ ----- 14647c478bd9Sstevel@tonic-gate * a: <modified instruction> <= 15 14657c478bd9Sstevel@tonic-gate * movq $<value>, %<scratch> 6 14667c478bd9Sstevel@tonic-gate * jmp 0(%rip) 6 14677c478bd9Sstevel@tonic-gate * <pc + tp->ftt_size> 8 14687c478bd9Sstevel@tonic-gate * b: <modified instruction> <= 15 14697c478bd9Sstevel@tonic-gate * int T_DTRACE_RET 2 14707c478bd9Sstevel@tonic-gate * ----- 14717c478bd9Sstevel@tonic-gate * 52 14727c478bd9Sstevel@tonic-gate * 14737c478bd9Sstevel@tonic-gate * We set curthread->t_dtrace_regv so that upon receiving 14747c478bd9Sstevel@tonic-gate * a signal we can reset the value of the scratch register. 14757c478bd9Sstevel@tonic-gate */ 14767c478bd9Sstevel@tonic-gate 14777c478bd9Sstevel@tonic-gate ASSERT(tp->ftt_size < FASTTRAP_MAX_INSTR_SIZE); 14787c478bd9Sstevel@tonic-gate 14797c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = addr; 14807c478bd9Sstevel@tonic-gate bcopy(tp->ftt_instr, &scratch[i], tp->ftt_size); 14817c478bd9Sstevel@tonic-gate i += tp->ftt_size; 14827c478bd9Sstevel@tonic-gate 14837c478bd9Sstevel@tonic-gate #ifdef __amd64 14847c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode != 0) { 14857c478bd9Sstevel@tonic-gate greg_t *reg; 14867c478bd9Sstevel@tonic-gate 14877c478bd9Sstevel@tonic-gate ASSERT(p->p_model == DATAMODEL_LP64); 14887c478bd9Sstevel@tonic-gate ASSERT(tp->ftt_ripmode & 14897c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_1 | FASTTRAP_RIP_2)); 14907c478bd9Sstevel@tonic-gate 14917c478bd9Sstevel@tonic-gate /* 14927c478bd9Sstevel@tonic-gate * If this was a %rip-relative instruction, we change 14937c478bd9Sstevel@tonic-gate * it to be either a %rax- or %rcx-relative 14947c478bd9Sstevel@tonic-gate * instruction (depending on whether those registers 14957c478bd9Sstevel@tonic-gate * are used as another operand; or %r8- or %r9- 14967c478bd9Sstevel@tonic-gate * relative depending on the value of REX.B). We then 14977c478bd9Sstevel@tonic-gate * set that register and generate a movq instruction 14987c478bd9Sstevel@tonic-gate * to reset the value. 14997c478bd9Sstevel@tonic-gate */ 15007c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode & FASTTRAP_RIP_X) 15017c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_REX(1, 0, 0, 1); 15027c478bd9Sstevel@tonic-gate else 15037c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_REX(1, 0, 0, 0); 15047c478bd9Sstevel@tonic-gate 15057c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode & FASTTRAP_RIP_1) 15067c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MOV_EAX; 15077c478bd9Sstevel@tonic-gate else 15087c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MOV_ECX; 15097c478bd9Sstevel@tonic-gate 15107c478bd9Sstevel@tonic-gate switch (tp->ftt_ripmode) { 15117c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_1: 15127c478bd9Sstevel@tonic-gate reg = &rp->r_rax; 15137c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_RAX; 15147c478bd9Sstevel@tonic-gate break; 15157c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_2: 15167c478bd9Sstevel@tonic-gate reg = &rp->r_rcx; 15177c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_RCX; 15187c478bd9Sstevel@tonic-gate break; 15197c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_1 | FASTTRAP_RIP_X: 15207c478bd9Sstevel@tonic-gate reg = &rp->r_r8; 15217c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_R8; 15227c478bd9Sstevel@tonic-gate break; 15237c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_2 | FASTTRAP_RIP_X: 15247c478bd9Sstevel@tonic-gate reg = &rp->r_r9; 15257c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_R9; 15267c478bd9Sstevel@tonic-gate break; 15277c478bd9Sstevel@tonic-gate } 15287c478bd9Sstevel@tonic-gate 15297c478bd9Sstevel@tonic-gate *(uint64_t *)&scratch[i] = *reg; 15307c478bd9Sstevel@tonic-gate curthread->t_dtrace_regv = *reg; 15317c478bd9Sstevel@tonic-gate *reg = pc + tp->ftt_size; 15327c478bd9Sstevel@tonic-gate i += sizeof (uint64_t); 15337c478bd9Sstevel@tonic-gate } 15347c478bd9Sstevel@tonic-gate #endif 15357c478bd9Sstevel@tonic-gate 15367c478bd9Sstevel@tonic-gate /* 15377c478bd9Sstevel@tonic-gate * Generate the branch instruction to what would have 15387c478bd9Sstevel@tonic-gate * normally been the subsequent instruction. In 32-bit mode, 15397c478bd9Sstevel@tonic-gate * this is just a relative branch; in 64-bit mode this is a 15407c478bd9Sstevel@tonic-gate * %rip-relative branch that loads the 64-bit pc value 15417c478bd9Sstevel@tonic-gate * immediately after the jmp instruction. 15427c478bd9Sstevel@tonic-gate */ 15437c478bd9Sstevel@tonic-gate #ifdef __amd64 15447c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) { 15457c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_GROUP5_OP; 15467c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MODRM(0, 4, 5); 15477c478bd9Sstevel@tonic-gate *(uint32_t *)&scratch[i] = 0; 15487c478bd9Sstevel@tonic-gate i += sizeof (uint32_t); 15497c478bd9Sstevel@tonic-gate *(uint64_t *)&scratch[i] = pc + tp->ftt_size; 15507c478bd9Sstevel@tonic-gate i += sizeof (uint64_t); 15517c478bd9Sstevel@tonic-gate } else { 15527c478bd9Sstevel@tonic-gate #endif 15537c478bd9Sstevel@tonic-gate /* 15547c478bd9Sstevel@tonic-gate * Set up the jmp to the next instruction; note that 15557c478bd9Sstevel@tonic-gate * the size of the traced instruction cancels out. 15567c478bd9Sstevel@tonic-gate */ 15577c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_JMP32; 15587c478bd9Sstevel@tonic-gate *(uint32_t *)&scratch[i] = pc - addr - 5; 15597c478bd9Sstevel@tonic-gate i += sizeof (uint32_t); 15607c478bd9Sstevel@tonic-gate #ifdef __amd64 15617c478bd9Sstevel@tonic-gate } 15627c478bd9Sstevel@tonic-gate #endif 15637c478bd9Sstevel@tonic-gate 15647c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = addr + i; 15657c478bd9Sstevel@tonic-gate bcopy(tp->ftt_instr, &scratch[i], tp->ftt_size); 15667c478bd9Sstevel@tonic-gate i += tp->ftt_size; 15677c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_INT; 15687c478bd9Sstevel@tonic-gate scratch[i++] = T_DTRACE_RET; 15697c478bd9Sstevel@tonic-gate 15707c478bd9Sstevel@tonic-gate if (fasttrap_copyout(scratch, (char *)addr, i)) { 15717c478bd9Sstevel@tonic-gate fasttrap_sigtrap(p, curthread, pc); 15727c478bd9Sstevel@tonic-gate new_pc = pc; 15737c478bd9Sstevel@tonic-gate break; 15747c478bd9Sstevel@tonic-gate } 15757c478bd9Sstevel@tonic-gate 15767c478bd9Sstevel@tonic-gate if (tp->ftt_retids != NULL) { 15777c478bd9Sstevel@tonic-gate curthread->t_dtrace_step = 1; 15787c478bd9Sstevel@tonic-gate curthread->t_dtrace_ret = 1; 15797c478bd9Sstevel@tonic-gate new_pc = curthread->t_dtrace_astpc; 15807c478bd9Sstevel@tonic-gate } else { 15817c478bd9Sstevel@tonic-gate new_pc = curthread->t_dtrace_scrpc; 15827c478bd9Sstevel@tonic-gate } 15837c478bd9Sstevel@tonic-gate 15847c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = pc; 15857c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = pc + tp->ftt_size; 15867c478bd9Sstevel@tonic-gate curthread->t_dtrace_on = 1; 15877c478bd9Sstevel@tonic-gate break; 15887c478bd9Sstevel@tonic-gate } 15897c478bd9Sstevel@tonic-gate 15907c478bd9Sstevel@tonic-gate default: 15917c478bd9Sstevel@tonic-gate panic("fasttrap: mishandled an instruction"); 15927c478bd9Sstevel@tonic-gate } 15937c478bd9Sstevel@tonic-gate 1594ac448965Sahl done: 15957c478bd9Sstevel@tonic-gate /* 15967c478bd9Sstevel@tonic-gate * If there were no return probes when we first found the tracepoint, 15977c478bd9Sstevel@tonic-gate * we should feel no obligation to honor any return probes that were 15987c478bd9Sstevel@tonic-gate * subsequently enabled -- they'll just have to wait until the next 15997c478bd9Sstevel@tonic-gate * time around. 16007c478bd9Sstevel@tonic-gate */ 16017c478bd9Sstevel@tonic-gate if (tp->ftt_retids != NULL) { 16027c478bd9Sstevel@tonic-gate /* 16037c478bd9Sstevel@tonic-gate * We need to wait until the results of the instruction are 16047c478bd9Sstevel@tonic-gate * apparent before invoking any return probes. If this 16057c478bd9Sstevel@tonic-gate * instruction was emulated we can just call 16067c478bd9Sstevel@tonic-gate * fasttrap_return_common(); if it needs to be executed, we 16077c478bd9Sstevel@tonic-gate * need to wait until the user thread returns to the kernel. 16087c478bd9Sstevel@tonic-gate */ 16097c478bd9Sstevel@tonic-gate if (tp->ftt_type != FASTTRAP_T_COMMON) { 16107c478bd9Sstevel@tonic-gate /* 16117c478bd9Sstevel@tonic-gate * Set the program counter to the address of the traced 16127c478bd9Sstevel@tonic-gate * instruction so that it looks right in ustack() 16137c478bd9Sstevel@tonic-gate * output. We had previously set it to the end of the 16147c478bd9Sstevel@tonic-gate * instruction to simplify %rip-relative addressing. 16157c478bd9Sstevel@tonic-gate */ 16167c478bd9Sstevel@tonic-gate rp->r_pc = pc; 16177c478bd9Sstevel@tonic-gate 16187c478bd9Sstevel@tonic-gate fasttrap_return_common(rp, pc, pid, new_pc); 16197c478bd9Sstevel@tonic-gate } else { 16207c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_ret != 0); 16217c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_pc == pc); 16227c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_scrpc != 0); 16237c478bd9Sstevel@tonic-gate ASSERT(new_pc == curthread->t_dtrace_astpc); 16247c478bd9Sstevel@tonic-gate } 16257c478bd9Sstevel@tonic-gate } 16267c478bd9Sstevel@tonic-gate 16277c478bd9Sstevel@tonic-gate rp->r_pc = new_pc; 16287c478bd9Sstevel@tonic-gate 16297c478bd9Sstevel@tonic-gate return (0); 16307c478bd9Sstevel@tonic-gate } 16317c478bd9Sstevel@tonic-gate 16327c478bd9Sstevel@tonic-gate int 16337c478bd9Sstevel@tonic-gate fasttrap_return_probe(struct regs *rp) 16347c478bd9Sstevel@tonic-gate { 16357c478bd9Sstevel@tonic-gate proc_t *p = curproc; 16367c478bd9Sstevel@tonic-gate uintptr_t pc = curthread->t_dtrace_pc; 16377c478bd9Sstevel@tonic-gate uintptr_t npc = curthread->t_dtrace_npc; 16387c478bd9Sstevel@tonic-gate 16397c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = 0; 16407c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = 0; 16417c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = 0; 16427c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = 0; 16437c478bd9Sstevel@tonic-gate 16447c478bd9Sstevel@tonic-gate /* 16457c478bd9Sstevel@tonic-gate * Treat a child created by a call to vfork(2) as if it were its 16467c478bd9Sstevel@tonic-gate * parent. We know that there's only one thread of control in such a 16477c478bd9Sstevel@tonic-gate * process: this one. 16487c478bd9Sstevel@tonic-gate */ 16497c478bd9Sstevel@tonic-gate while (p->p_flag & SVFORK) { 16507c478bd9Sstevel@tonic-gate p = p->p_parent; 16517c478bd9Sstevel@tonic-gate } 16527c478bd9Sstevel@tonic-gate 16537c478bd9Sstevel@tonic-gate /* 16547c478bd9Sstevel@tonic-gate * We set rp->r_pc to the address of the traced instruction so 16557c478bd9Sstevel@tonic-gate * that it appears to dtrace_probe() that we're on the original 16567c478bd9Sstevel@tonic-gate * instruction, and so that the user can't easily detect our 16577c478bd9Sstevel@tonic-gate * complex web of lies. dtrace_return_probe() (our caller) 16587c478bd9Sstevel@tonic-gate * will correctly set %pc after we return. 16597c478bd9Sstevel@tonic-gate */ 16607c478bd9Sstevel@tonic-gate rp->r_pc = pc; 16617c478bd9Sstevel@tonic-gate 16627c478bd9Sstevel@tonic-gate fasttrap_return_common(rp, pc, p->p_pid, npc); 16637c478bd9Sstevel@tonic-gate 16647c478bd9Sstevel@tonic-gate return (0); 16657c478bd9Sstevel@tonic-gate } 16667c478bd9Sstevel@tonic-gate 16677c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 16687c478bd9Sstevel@tonic-gate uint64_t 1669f498645aSahl fasttrap_pid_getarg(void *arg, dtrace_id_t id, void *parg, int argno, 1670f498645aSahl int aframes) 16717c478bd9Sstevel@tonic-gate { 16727c478bd9Sstevel@tonic-gate return (fasttrap_anarg(ttolwp(curthread)->lwp_regs, 1, argno)); 16737c478bd9Sstevel@tonic-gate } 16747c478bd9Sstevel@tonic-gate 16757c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 16767c478bd9Sstevel@tonic-gate uint64_t 16777c478bd9Sstevel@tonic-gate fasttrap_usdt_getarg(void *arg, dtrace_id_t id, void *parg, int argno, 16787c478bd9Sstevel@tonic-gate int aframes) 16797c478bd9Sstevel@tonic-gate { 16807c478bd9Sstevel@tonic-gate return (fasttrap_anarg(ttolwp(curthread)->lwp_regs, 0, argno)); 16817c478bd9Sstevel@tonic-gate } 16827c478bd9Sstevel@tonic-gate 16837c478bd9Sstevel@tonic-gate static ulong_t 16847c478bd9Sstevel@tonic-gate fasttrap_getreg(struct regs *rp, uint_t reg) 16857c478bd9Sstevel@tonic-gate { 16867c478bd9Sstevel@tonic-gate #ifdef __amd64 16877c478bd9Sstevel@tonic-gate switch (reg) { 16887c478bd9Sstevel@tonic-gate case REG_R15: return (rp->r_r15); 16897c478bd9Sstevel@tonic-gate case REG_R14: return (rp->r_r14); 16907c478bd9Sstevel@tonic-gate case REG_R13: return (rp->r_r13); 16917c478bd9Sstevel@tonic-gate case REG_R12: return (rp->r_r12); 16927c478bd9Sstevel@tonic-gate case REG_R11: return (rp->r_r11); 16937c478bd9Sstevel@tonic-gate case REG_R10: return (rp->r_r10); 16947c478bd9Sstevel@tonic-gate case REG_R9: return (rp->r_r9); 16957c478bd9Sstevel@tonic-gate case REG_R8: return (rp->r_r8); 16967c478bd9Sstevel@tonic-gate case REG_RDI: return (rp->r_rdi); 16977c478bd9Sstevel@tonic-gate case REG_RSI: return (rp->r_rsi); 16987c478bd9Sstevel@tonic-gate case REG_RBP: return (rp->r_rbp); 16997c478bd9Sstevel@tonic-gate case REG_RBX: return (rp->r_rbx); 17007c478bd9Sstevel@tonic-gate case REG_RDX: return (rp->r_rdx); 17017c478bd9Sstevel@tonic-gate case REG_RCX: return (rp->r_rcx); 17027c478bd9Sstevel@tonic-gate case REG_RAX: return (rp->r_rax); 17037c478bd9Sstevel@tonic-gate case REG_TRAPNO: return (rp->r_trapno); 17047c478bd9Sstevel@tonic-gate case REG_ERR: return (rp->r_err); 17057c478bd9Sstevel@tonic-gate case REG_RIP: return (rp->r_rip); 17067c478bd9Sstevel@tonic-gate case REG_CS: return (rp->r_cs); 17077c478bd9Sstevel@tonic-gate case REG_RFL: return (rp->r_rfl); 17087c478bd9Sstevel@tonic-gate case REG_RSP: return (rp->r_rsp); 17097c478bd9Sstevel@tonic-gate case REG_SS: return (rp->r_ss); 17107c478bd9Sstevel@tonic-gate case REG_FS: return (rp->r_fs); 17117c478bd9Sstevel@tonic-gate case REG_GS: return (rp->r_gs); 17127c478bd9Sstevel@tonic-gate case REG_DS: return (rp->r_ds); 17137c478bd9Sstevel@tonic-gate case REG_ES: return (rp->r_es); 17147c478bd9Sstevel@tonic-gate case REG_FSBASE: return (rp->r_fsbase); 17157c478bd9Sstevel@tonic-gate case REG_GSBASE: return (rp->r_gsbase); 17167c478bd9Sstevel@tonic-gate } 17177c478bd9Sstevel@tonic-gate 17187c478bd9Sstevel@tonic-gate panic("dtrace: illegal register constant"); 17197c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 17207c478bd9Sstevel@tonic-gate #else 17217c478bd9Sstevel@tonic-gate if (reg >= _NGREG) 17227c478bd9Sstevel@tonic-gate panic("dtrace: illegal register constant"); 17237c478bd9Sstevel@tonic-gate 17247c478bd9Sstevel@tonic-gate return (((greg_t *)&rp->r_gs)[reg]); 17257c478bd9Sstevel@tonic-gate #endif 17267c478bd9Sstevel@tonic-gate } 1727