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 /*
236009dbc6Sahl * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
247c478bd9Sstevel@tonic-gate * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate */
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate #include <sys/fasttrap_isa.h>
287c478bd9Sstevel@tonic-gate #include <sys/fasttrap_impl.h>
297c478bd9Sstevel@tonic-gate #include <sys/dtrace.h>
307c478bd9Sstevel@tonic-gate #include <sys/dtrace_impl.h>
317c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h>
327c478bd9Sstevel@tonic-gate #include <sys/regset.h>
337c478bd9Sstevel@tonic-gate #include <sys/privregs.h>
347c478bd9Sstevel@tonic-gate #include <sys/segments.h>
35ae115bc7Smrj #include <sys/x86_archext.h>
367c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h>
377c478bd9Sstevel@tonic-gate #include <sys/trap.h>
389acbbeafSnn #include <sys/archsystm.h>
397c478bd9Sstevel@tonic-gate
407c478bd9Sstevel@tonic-gate /*
417c478bd9Sstevel@tonic-gate * Lossless User-Land Tracing on x86
427c478bd9Sstevel@tonic-gate * ---------------------------------
437c478bd9Sstevel@tonic-gate *
44ac448965Sahl * The execution of most instructions is not dependent on the address; for
45ac448965Sahl * these instructions it is sufficient to copy them into the user process's
46ac448965Sahl * address space and execute them. To effectively single-step an instruction
47ac448965Sahl * in user-land, we copy out the following sequence of instructions to scratch
487c478bd9Sstevel@tonic-gate * space in the user thread's ulwp_t structure.
497c478bd9Sstevel@tonic-gate *
507c478bd9Sstevel@tonic-gate * We then set the program counter (%eip or %rip) to point to this scratch
517c478bd9Sstevel@tonic-gate * space. Once execution resumes, the original instruction is executed and
527c478bd9Sstevel@tonic-gate * then control flow is redirected to what was originally the subsequent
537c478bd9Sstevel@tonic-gate * instruction. If the kernel attemps to deliver a signal while single-
547c478bd9Sstevel@tonic-gate * stepping, the signal is deferred and the program counter is moved into the
557c478bd9Sstevel@tonic-gate * second sequence of instructions. The second sequence ends in a trap into
567c478bd9Sstevel@tonic-gate * the kernel where the deferred signal is then properly handled and delivered.
577c478bd9Sstevel@tonic-gate *
587c478bd9Sstevel@tonic-gate * For instructions whose execute is position dependent, we perform simple
597c478bd9Sstevel@tonic-gate * emulation. These instructions are limited to control transfer
607c478bd9Sstevel@tonic-gate * instructions in 32-bit mode, but in 64-bit mode there's the added wrinkle
617c478bd9Sstevel@tonic-gate * of %rip-relative addressing that means that almost any instruction can be
627c478bd9Sstevel@tonic-gate * position dependent. For all the details on how we emulate generic
637c478bd9Sstevel@tonic-gate * instructions included %rip-relative instructions, see the code in
647c478bd9Sstevel@tonic-gate * fasttrap_pid_probe() below where we handle instructions of type
657c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON (under the header: Generic Instruction Tracing).
667c478bd9Sstevel@tonic-gate */
677c478bd9Sstevel@tonic-gate
687c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_MOD(modrm) (((modrm) >> 6) & 0x3)
697c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_REG(modrm) (((modrm) >> 3) & 0x7)
707c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM_RM(modrm) ((modrm) & 0x7)
717c478bd9Sstevel@tonic-gate #define FASTTRAP_MODRM(mod, reg, rm) (((mod) << 6) | ((reg) << 3) | (rm))
727c478bd9Sstevel@tonic-gate
737c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_SCALE(sib) (((sib) >> 6) & 0x3)
747c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_INDEX(sib) (((sib) >> 3) & 0x7)
757c478bd9Sstevel@tonic-gate #define FASTTRAP_SIB_BASE(sib) ((sib) & 0x7)
767c478bd9Sstevel@tonic-gate
777c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_W(rex) (((rex) >> 3) & 1)
787c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_R(rex) (((rex) >> 2) & 1)
797c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_X(rex) (((rex) >> 1) & 1)
807c478bd9Sstevel@tonic-gate #define FASTTRAP_REX_B(rex) ((rex) & 1)
817c478bd9Sstevel@tonic-gate #define FASTTRAP_REX(w, r, x, b) \
827c478bd9Sstevel@tonic-gate (0x40 | ((w) << 3) | ((r) << 2) | ((x) << 1) | (b))
837c478bd9Sstevel@tonic-gate
847c478bd9Sstevel@tonic-gate /*
857c478bd9Sstevel@tonic-gate * Single-byte op-codes.
867c478bd9Sstevel@tonic-gate */
877c478bd9Sstevel@tonic-gate #define FASTTRAP_PUSHL_EBP 0x55
887c478bd9Sstevel@tonic-gate
897c478bd9Sstevel@tonic-gate #define FASTTRAP_JO 0x70
907c478bd9Sstevel@tonic-gate #define FASTTRAP_JNO 0x71
917c478bd9Sstevel@tonic-gate #define FASTTRAP_JB 0x72
927c478bd9Sstevel@tonic-gate #define FASTTRAP_JAE 0x73
937c478bd9Sstevel@tonic-gate #define FASTTRAP_JE 0x74
947c478bd9Sstevel@tonic-gate #define FASTTRAP_JNE 0x75
957c478bd9Sstevel@tonic-gate #define FASTTRAP_JBE 0x76
967c478bd9Sstevel@tonic-gate #define FASTTRAP_JA 0x77
977c478bd9Sstevel@tonic-gate #define FASTTRAP_JS 0x78
987c478bd9Sstevel@tonic-gate #define FASTTRAP_JNS 0x79
997c478bd9Sstevel@tonic-gate #define FASTTRAP_JP 0x7a
1007c478bd9Sstevel@tonic-gate #define FASTTRAP_JNP 0x7b
1017c478bd9Sstevel@tonic-gate #define FASTTRAP_JL 0x7c
1027c478bd9Sstevel@tonic-gate #define FASTTRAP_JGE 0x7d
1037c478bd9Sstevel@tonic-gate #define FASTTRAP_JLE 0x7e
1047c478bd9Sstevel@tonic-gate #define FASTTRAP_JG 0x7f
1057c478bd9Sstevel@tonic-gate
1062b6e762cSahl #define FASTTRAP_NOP 0x90
1072b6e762cSahl
1087c478bd9Sstevel@tonic-gate #define FASTTRAP_MOV_EAX 0xb8
1097c478bd9Sstevel@tonic-gate #define FASTTRAP_MOV_ECX 0xb9
1107c478bd9Sstevel@tonic-gate
1117c478bd9Sstevel@tonic-gate #define FASTTRAP_RET16 0xc2
1127c478bd9Sstevel@tonic-gate #define FASTTRAP_RET 0xc3
1137c478bd9Sstevel@tonic-gate
1147c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOPNZ 0xe0
1157c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOPZ 0xe1
1167c478bd9Sstevel@tonic-gate #define FASTTRAP_LOOP 0xe2
1177c478bd9Sstevel@tonic-gate #define FASTTRAP_JCXZ 0xe3
1187c478bd9Sstevel@tonic-gate
1197c478bd9Sstevel@tonic-gate #define FASTTRAP_CALL 0xe8
1207c478bd9Sstevel@tonic-gate #define FASTTRAP_JMP32 0xe9
1217c478bd9Sstevel@tonic-gate #define FASTTRAP_JMP8 0xeb
1227c478bd9Sstevel@tonic-gate
1237c478bd9Sstevel@tonic-gate #define FASTTRAP_INT3 0xcc
1247c478bd9Sstevel@tonic-gate #define FASTTRAP_INT 0xcd
1257c478bd9Sstevel@tonic-gate
1267c478bd9Sstevel@tonic-gate #define FASTTRAP_2_BYTE_OP 0x0f
1277c478bd9Sstevel@tonic-gate #define FASTTRAP_GROUP5_OP 0xff
1287c478bd9Sstevel@tonic-gate
1297c478bd9Sstevel@tonic-gate /*
1307c478bd9Sstevel@tonic-gate * Two-byte op-codes (second byte only).
1317c478bd9Sstevel@tonic-gate */
1327c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JO 0x80
1337c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNO 0x81
1347c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JB 0x82
1357c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JAE 0x83
1367c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JE 0x84
1377c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNE 0x85
1387c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JBE 0x86
1397c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JA 0x87
1407c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JS 0x88
1417c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNS 0x89
1427c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JP 0x8a
1437c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JNP 0x8b
1447c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JL 0x8c
1457c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JGE 0x8d
1467c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JLE 0x8e
1477c478bd9Sstevel@tonic-gate #define FASTTRAP_0F_JG 0x8f
1487c478bd9Sstevel@tonic-gate
1497c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_OF 0x800
1507c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_DF 0x400
1517c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_SF 0x080
1527c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_ZF 0x040
1537c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_AF 0x010
1547c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_PF 0x004
1557c478bd9Sstevel@tonic-gate #define FASTTRAP_EFLAGS_CF 0x001
1567c478bd9Sstevel@tonic-gate
1577c478bd9Sstevel@tonic-gate /*
1587c478bd9Sstevel@tonic-gate * Instruction prefixes.
1597c478bd9Sstevel@tonic-gate */
1607c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_OPERAND 0x66
1617c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_ADDRESS 0x67
1627c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_CS 0x2E
1637c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_DS 0x3E
1647c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_ES 0x26
1657c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_FS 0x64
1667c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_GS 0x65
1677c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_SS 0x36
1687c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_LOCK 0xF0
1697c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_REP 0xF3
1707c478bd9Sstevel@tonic-gate #define FASTTRAP_PREFIX_REPNE 0xF2
1717c478bd9Sstevel@tonic-gate
1727c478bd9Sstevel@tonic-gate #define FASTTRAP_NOREG 0xff
1737c478bd9Sstevel@tonic-gate
1747c478bd9Sstevel@tonic-gate /*
1757c478bd9Sstevel@tonic-gate * Map between instruction register encodings and the kernel constants which
1767c478bd9Sstevel@tonic-gate * correspond to indicies into struct regs.
1777c478bd9Sstevel@tonic-gate */
1787c478bd9Sstevel@tonic-gate static const uint8_t regmap[16] = {
1797c478bd9Sstevel@tonic-gate REG_RAX, REG_RCX, REG_RDX, REG_RBX, REG_RSP, REG_RBP, REG_RSI, REG_RDI,
1807c478bd9Sstevel@tonic-gate REG_R8, REG_R9, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15,
1817c478bd9Sstevel@tonic-gate };
1827c478bd9Sstevel@tonic-gate
1837c478bd9Sstevel@tonic-gate static ulong_t fasttrap_getreg(struct regs *, uint_t);
1847c478bd9Sstevel@tonic-gate
1857c478bd9Sstevel@tonic-gate static uint64_t
fasttrap_anarg(struct regs * rp,int function_entry,int argno)1867c478bd9Sstevel@tonic-gate fasttrap_anarg(struct regs *rp, int function_entry, int argno)
1877c478bd9Sstevel@tonic-gate {
1887c478bd9Sstevel@tonic-gate uint64_t value;
1897c478bd9Sstevel@tonic-gate int shift = function_entry ? 1 : 0;
1907c478bd9Sstevel@tonic-gate
1917c478bd9Sstevel@tonic-gate if (curproc->p_model == DATAMODEL_LP64) {
1927c478bd9Sstevel@tonic-gate uintptr_t *stack;
1937c478bd9Sstevel@tonic-gate
1947c478bd9Sstevel@tonic-gate /*
1957c478bd9Sstevel@tonic-gate * In 64-bit mode, the first six arguments are stored in
1967c478bd9Sstevel@tonic-gate * registers.
1977c478bd9Sstevel@tonic-gate */
1987c478bd9Sstevel@tonic-gate if (argno < 6)
1997c478bd9Sstevel@tonic-gate return ((&rp->r_rdi)[argno]);
2007c478bd9Sstevel@tonic-gate
2017c478bd9Sstevel@tonic-gate stack = (uintptr_t *)rp->r_sp;
2027c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
2037c478bd9Sstevel@tonic-gate value = dtrace_fulword(&stack[argno - 6 + shift]);
2047c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR);
2057c478bd9Sstevel@tonic-gate } else {
2067c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp;
2077c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
2087c478bd9Sstevel@tonic-gate value = dtrace_fuword32(&stack[argno + shift]);
2097c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT | CPU_DTRACE_BADADDR);
2107c478bd9Sstevel@tonic-gate }
2117c478bd9Sstevel@tonic-gate
2127c478bd9Sstevel@tonic-gate return (value);
2137c478bd9Sstevel@tonic-gate }
2147c478bd9Sstevel@tonic-gate
2157c478bd9Sstevel@tonic-gate /*ARGSUSED*/
2167c478bd9Sstevel@tonic-gate int
fasttrap_tracepoint_init(proc_t * p,fasttrap_tracepoint_t * tp,uintptr_t pc,fasttrap_probe_type_t type)217ac448965Sahl fasttrap_tracepoint_init(proc_t *p, fasttrap_tracepoint_t *tp, uintptr_t pc,
218ac448965Sahl fasttrap_probe_type_t type)
2197c478bd9Sstevel@tonic-gate {
2207c478bd9Sstevel@tonic-gate uint8_t instr[FASTTRAP_MAX_INSTR_SIZE + 10];
2217c478bd9Sstevel@tonic-gate size_t len = FASTTRAP_MAX_INSTR_SIZE;
2227c478bd9Sstevel@tonic-gate size_t first = MIN(len, PAGESIZE - (pc & PAGEOFFSET));
2237c478bd9Sstevel@tonic-gate uint_t start = 0;
2242b6e762cSahl int rmindex, size;
2259acbbeafSnn uint8_t seg, rex = 0;
2267c478bd9Sstevel@tonic-gate
2277c478bd9Sstevel@tonic-gate /*
2287c478bd9Sstevel@tonic-gate * Read the instruction at the given address out of the process's
2297c478bd9Sstevel@tonic-gate * address space. We don't have to worry about a debugger
2307c478bd9Sstevel@tonic-gate * changing this instruction before we overwrite it with our trap
2317c478bd9Sstevel@tonic-gate * instruction since P_PR_LOCK is set. Since instructions can span
2327c478bd9Sstevel@tonic-gate * pages, we potentially read the instruction in two parts. If the
2337c478bd9Sstevel@tonic-gate * second part fails, we just zero out that part of the instruction.
2347c478bd9Sstevel@tonic-gate */
2357c478bd9Sstevel@tonic-gate if (uread(p, &instr[0], first, pc) != 0)
2367c478bd9Sstevel@tonic-gate return (-1);
2377c478bd9Sstevel@tonic-gate if (len > first &&
2387c478bd9Sstevel@tonic-gate uread(p, &instr[first], len - first, pc + first) != 0) {
2397c478bd9Sstevel@tonic-gate bzero(&instr[first], len - first);
2407c478bd9Sstevel@tonic-gate len = first;
2417c478bd9Sstevel@tonic-gate }
2427c478bd9Sstevel@tonic-gate
2437c478bd9Sstevel@tonic-gate /*
2447c478bd9Sstevel@tonic-gate * If the disassembly fails, then we have a malformed instruction.
2457c478bd9Sstevel@tonic-gate */
2462b6e762cSahl if ((size = dtrace_instr_size_isa(instr, p->p_model, &rmindex)) <= 0)
2477c478bd9Sstevel@tonic-gate return (-1);
2487c478bd9Sstevel@tonic-gate
2497c478bd9Sstevel@tonic-gate /*
2507c478bd9Sstevel@tonic-gate * Make sure the disassembler isn't completely broken.
2517c478bd9Sstevel@tonic-gate */
2522b6e762cSahl ASSERT(-1 <= rmindex && rmindex < size);
2537c478bd9Sstevel@tonic-gate
2547c478bd9Sstevel@tonic-gate /*
2557c478bd9Sstevel@tonic-gate * If the computed size is greater than the number of bytes read,
2567c478bd9Sstevel@tonic-gate * then it was a malformed instruction possibly because it fell on a
2577c478bd9Sstevel@tonic-gate * page boundary and the subsequent page was missing or because of
2587c478bd9Sstevel@tonic-gate * some malicious user.
2597c478bd9Sstevel@tonic-gate */
2602b6e762cSahl if (size > len)
2617c478bd9Sstevel@tonic-gate return (-1);
2627c478bd9Sstevel@tonic-gate
2632b6e762cSahl tp->ftt_size = (uint8_t)size;
2649acbbeafSnn tp->ftt_segment = FASTTRAP_SEG_NONE;
2659acbbeafSnn
2667c478bd9Sstevel@tonic-gate /*
2677c478bd9Sstevel@tonic-gate * Find the start of the instruction's opcode by processing any
2687c478bd9Sstevel@tonic-gate * legacy prefixes.
2697c478bd9Sstevel@tonic-gate */
2707c478bd9Sstevel@tonic-gate for (;;) {
2719acbbeafSnn seg = 0;
2727c478bd9Sstevel@tonic-gate switch (instr[start]) {
2739acbbeafSnn case FASTTRAP_PREFIX_SS:
2749acbbeafSnn seg++;
2759acbbeafSnn /*FALLTHRU*/
2769acbbeafSnn case FASTTRAP_PREFIX_GS:
2779acbbeafSnn seg++;
2789acbbeafSnn /*FALLTHRU*/
2799acbbeafSnn case FASTTRAP_PREFIX_FS:
2809acbbeafSnn seg++;
2819acbbeafSnn /*FALLTHRU*/
2829acbbeafSnn case FASTTRAP_PREFIX_ES:
2839acbbeafSnn seg++;
2849acbbeafSnn /*FALLTHRU*/
2859acbbeafSnn case FASTTRAP_PREFIX_DS:
2869acbbeafSnn seg++;
2879acbbeafSnn /*FALLTHRU*/
2889acbbeafSnn case FASTTRAP_PREFIX_CS:
2899acbbeafSnn seg++;
2909acbbeafSnn /*FALLTHRU*/
2917c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_OPERAND:
2927c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_ADDRESS:
2937c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_LOCK:
2947c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_REP:
2957c478bd9Sstevel@tonic-gate case FASTTRAP_PREFIX_REPNE:
2969acbbeafSnn if (seg != 0) {
2979acbbeafSnn /*
2989acbbeafSnn * It's illegal for an instruction to specify
2999acbbeafSnn * two segment prefixes -- give up on this
3009acbbeafSnn * illegal instruction.
3019acbbeafSnn */
3029acbbeafSnn if (tp->ftt_segment != FASTTRAP_SEG_NONE)
3039acbbeafSnn return (-1);
3049acbbeafSnn
3059acbbeafSnn tp->ftt_segment = seg;
3069acbbeafSnn }
3077c478bd9Sstevel@tonic-gate start++;
3087c478bd9Sstevel@tonic-gate continue;
3097c478bd9Sstevel@tonic-gate }
3107c478bd9Sstevel@tonic-gate break;
3117c478bd9Sstevel@tonic-gate }
3127c478bd9Sstevel@tonic-gate
3137c478bd9Sstevel@tonic-gate /*
3147c478bd9Sstevel@tonic-gate * Identify the REX prefix on 64-bit processes.
3157c478bd9Sstevel@tonic-gate */
3167c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64 && (instr[start] & 0xf0) == 0x40)
3177c478bd9Sstevel@tonic-gate rex = instr[start++];
3187c478bd9Sstevel@tonic-gate
3197c478bd9Sstevel@tonic-gate /*
3207c478bd9Sstevel@tonic-gate * Now that we're pretty sure that the instruction is okay, copy the
3217c478bd9Sstevel@tonic-gate * valid part to the tracepoint.
3227c478bd9Sstevel@tonic-gate */
3237c478bd9Sstevel@tonic-gate bcopy(instr, tp->ftt_instr, FASTTRAP_MAX_INSTR_SIZE);
3247c478bd9Sstevel@tonic-gate
3257c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_COMMON;
3267c478bd9Sstevel@tonic-gate if (instr[start] == FASTTRAP_2_BYTE_OP) {
3277c478bd9Sstevel@tonic-gate switch (instr[start + 1]) {
3287c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JO:
3297c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNO:
3307c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JB:
3317c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JAE:
3327c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JE:
3337c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNE:
3347c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JBE:
3357c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JA:
3367c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JS:
3377c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNS:
3387c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JP:
3397c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JNP:
3407c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JL:
3417c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JGE:
3427c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JLE:
3437c478bd9Sstevel@tonic-gate case FASTTRAP_0F_JG:
3447c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCC;
3457c478bd9Sstevel@tonic-gate tp->ftt_code = (instr[start + 1] & 0x0f) | FASTTRAP_JO;
3467c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
34773427c57Sahl /* LINTED - alignment */
3487c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 2];
3497c478bd9Sstevel@tonic-gate break;
3507c478bd9Sstevel@tonic-gate }
3517c478bd9Sstevel@tonic-gate } else if (instr[start] == FASTTRAP_GROUP5_OP) {
3527c478bd9Sstevel@tonic-gate uint_t mod = FASTTRAP_MODRM_MOD(instr[start + 1]);
3537c478bd9Sstevel@tonic-gate uint_t reg = FASTTRAP_MODRM_REG(instr[start + 1]);
3547c478bd9Sstevel@tonic-gate uint_t rm = FASTTRAP_MODRM_RM(instr[start + 1]);
3557c478bd9Sstevel@tonic-gate
3567c478bd9Sstevel@tonic-gate if (reg == 2 || reg == 4) {
3577c478bd9Sstevel@tonic-gate uint_t i, sz;
3587c478bd9Sstevel@tonic-gate
3597c478bd9Sstevel@tonic-gate if (reg == 2)
3607c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_CALL;
3617c478bd9Sstevel@tonic-gate else
3627c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP;
3637c478bd9Sstevel@tonic-gate
3647c478bd9Sstevel@tonic-gate if (mod == 3)
3657c478bd9Sstevel@tonic-gate tp->ftt_code = 2;
3667c478bd9Sstevel@tonic-gate else
3677c478bd9Sstevel@tonic-gate tp->ftt_code = 1;
3687c478bd9Sstevel@tonic-gate
3697c478bd9Sstevel@tonic-gate ASSERT(p->p_model == DATAMODEL_LP64 || rex == 0);
3707c478bd9Sstevel@tonic-gate
3717c478bd9Sstevel@tonic-gate /*
3727c478bd9Sstevel@tonic-gate * See AMD x86-64 Architecture Programmer's Manual
3737c478bd9Sstevel@tonic-gate * Volume 3, Section 1.2.7, Table 1-12, and
3747c478bd9Sstevel@tonic-gate * Appendix A.3.1, Table A-15.
3757c478bd9Sstevel@tonic-gate */
3767c478bd9Sstevel@tonic-gate if (mod != 3 && rm == 4) {
3777c478bd9Sstevel@tonic-gate uint8_t sib = instr[start + 2];
3787c478bd9Sstevel@tonic-gate uint_t index = FASTTRAP_SIB_INDEX(sib);
3797c478bd9Sstevel@tonic-gate uint_t base = FASTTRAP_SIB_BASE(sib);
3807c478bd9Sstevel@tonic-gate
3817c478bd9Sstevel@tonic-gate tp->ftt_scale = FASTTRAP_SIB_SCALE(sib);
3827c478bd9Sstevel@tonic-gate
3837c478bd9Sstevel@tonic-gate tp->ftt_index = (index == 4) ?
3847c478bd9Sstevel@tonic-gate FASTTRAP_NOREG :
3857c478bd9Sstevel@tonic-gate regmap[index | (FASTTRAP_REX_X(rex) << 3)];
3867c478bd9Sstevel@tonic-gate tp->ftt_base = (mod == 0 && base == 5) ?
3877c478bd9Sstevel@tonic-gate FASTTRAP_NOREG :
3887c478bd9Sstevel@tonic-gate regmap[base | (FASTTRAP_REX_B(rex) << 3)];
3897c478bd9Sstevel@tonic-gate
3907c478bd9Sstevel@tonic-gate i = 3;
3917c478bd9Sstevel@tonic-gate sz = mod == 1 ? 1 : 4;
3927c478bd9Sstevel@tonic-gate } else {
3937c478bd9Sstevel@tonic-gate /*
3947c478bd9Sstevel@tonic-gate * In 64-bit mode, mod == 0 and r/m == 5
3957c478bd9Sstevel@tonic-gate * denotes %rip-relative addressing; in 32-bit
3967c478bd9Sstevel@tonic-gate * mode, the base register isn't used. In both
3977c478bd9Sstevel@tonic-gate * modes, there is a 32-bit operand.
3987c478bd9Sstevel@tonic-gate */
3997c478bd9Sstevel@tonic-gate if (mod == 0 && rm == 5) {
4007c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64)
4017c478bd9Sstevel@tonic-gate tp->ftt_base = REG_RIP;
4027c478bd9Sstevel@tonic-gate else
4037c478bd9Sstevel@tonic-gate tp->ftt_base = FASTTRAP_NOREG;
4047c478bd9Sstevel@tonic-gate sz = 4;
4057c478bd9Sstevel@tonic-gate } else {
4067c478bd9Sstevel@tonic-gate uint8_t base = rm |
4077c478bd9Sstevel@tonic-gate (FASTTRAP_REX_B(rex) << 3);
4087c478bd9Sstevel@tonic-gate
4097c478bd9Sstevel@tonic-gate tp->ftt_base = regmap[base];
4107c478bd9Sstevel@tonic-gate sz = mod == 1 ? 1 : mod == 2 ? 4 : 0;
4117c478bd9Sstevel@tonic-gate }
4127c478bd9Sstevel@tonic-gate tp->ftt_index = FASTTRAP_NOREG;
4137c478bd9Sstevel@tonic-gate i = 2;
4147c478bd9Sstevel@tonic-gate }
4157c478bd9Sstevel@tonic-gate
41673427c57Sahl if (sz == 1) {
4177c478bd9Sstevel@tonic-gate tp->ftt_dest = *(int8_t *)&instr[start + i];
41873427c57Sahl } else if (sz == 4) {
41973427c57Sahl /* LINTED - alignment */
4207c478bd9Sstevel@tonic-gate tp->ftt_dest = *(int32_t *)&instr[start + i];
42173427c57Sahl } else {
4227c478bd9Sstevel@tonic-gate tp->ftt_dest = 0;
42373427c57Sahl }
4247c478bd9Sstevel@tonic-gate }
4257c478bd9Sstevel@tonic-gate } else {
4267c478bd9Sstevel@tonic-gate switch (instr[start]) {
4277c478bd9Sstevel@tonic-gate case FASTTRAP_RET:
4287c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_RET;
4297c478bd9Sstevel@tonic-gate break;
4307c478bd9Sstevel@tonic-gate
4317c478bd9Sstevel@tonic-gate case FASTTRAP_RET16:
4327c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_RET16;
43373427c57Sahl /* LINTED - alignment */
4347c478bd9Sstevel@tonic-gate tp->ftt_dest = *(uint16_t *)&instr[start + 1];
4357c478bd9Sstevel@tonic-gate break;
4367c478bd9Sstevel@tonic-gate
4377c478bd9Sstevel@tonic-gate case FASTTRAP_JO:
4387c478bd9Sstevel@tonic-gate case FASTTRAP_JNO:
4397c478bd9Sstevel@tonic-gate case FASTTRAP_JB:
4407c478bd9Sstevel@tonic-gate case FASTTRAP_JAE:
4417c478bd9Sstevel@tonic-gate case FASTTRAP_JE:
4427c478bd9Sstevel@tonic-gate case FASTTRAP_JNE:
4437c478bd9Sstevel@tonic-gate case FASTTRAP_JBE:
4447c478bd9Sstevel@tonic-gate case FASTTRAP_JA:
4457c478bd9Sstevel@tonic-gate case FASTTRAP_JS:
4467c478bd9Sstevel@tonic-gate case FASTTRAP_JNS:
4477c478bd9Sstevel@tonic-gate case FASTTRAP_JP:
4487c478bd9Sstevel@tonic-gate case FASTTRAP_JNP:
4497c478bd9Sstevel@tonic-gate case FASTTRAP_JL:
4507c478bd9Sstevel@tonic-gate case FASTTRAP_JGE:
4517c478bd9Sstevel@tonic-gate case FASTTRAP_JLE:
4527c478bd9Sstevel@tonic-gate case FASTTRAP_JG:
4537c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCC;
4547c478bd9Sstevel@tonic-gate tp->ftt_code = instr[start];
4557c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
4567c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1];
4577c478bd9Sstevel@tonic-gate break;
4587c478bd9Sstevel@tonic-gate
4597c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPNZ:
4607c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPZ:
4617c478bd9Sstevel@tonic-gate case FASTTRAP_LOOP:
4627c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_LOOP;
4637c478bd9Sstevel@tonic-gate tp->ftt_code = instr[start];
4647c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
4657c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1];
4667c478bd9Sstevel@tonic-gate break;
4677c478bd9Sstevel@tonic-gate
4687c478bd9Sstevel@tonic-gate case FASTTRAP_JCXZ:
4697c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JCXZ;
4707c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
4717c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1];
4727c478bd9Sstevel@tonic-gate break;
4737c478bd9Sstevel@tonic-gate
4747c478bd9Sstevel@tonic-gate case FASTTRAP_CALL:
4757c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_CALL;
4767c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
47773427c57Sahl /* LINTED - alignment */
4787c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 1];
4797c478bd9Sstevel@tonic-gate tp->ftt_code = 0;
4807c478bd9Sstevel@tonic-gate break;
4817c478bd9Sstevel@tonic-gate
4827c478bd9Sstevel@tonic-gate case FASTTRAP_JMP32:
4837c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP;
4847c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
48573427c57Sahl /* LINTED - alignment */
4867c478bd9Sstevel@tonic-gate *(int32_t *)&instr[start + 1];
4877c478bd9Sstevel@tonic-gate break;
4887c478bd9Sstevel@tonic-gate case FASTTRAP_JMP8:
4897c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_JMP;
4907c478bd9Sstevel@tonic-gate tp->ftt_dest = pc + tp->ftt_size +
4917c478bd9Sstevel@tonic-gate (int8_t)instr[start + 1];
4927c478bd9Sstevel@tonic-gate break;
4937c478bd9Sstevel@tonic-gate
4947c478bd9Sstevel@tonic-gate case FASTTRAP_PUSHL_EBP:
4957c478bd9Sstevel@tonic-gate if (start == 0)
4967c478bd9Sstevel@tonic-gate tp->ftt_type = FASTTRAP_T_PUSHL_EBP;
4977c478bd9Sstevel@tonic-gate break;
4987c478bd9Sstevel@tonic-gate
4992b6e762cSahl case FASTTRAP_NOP:
5002b6e762cSahl ASSERT(p->p_model == DATAMODEL_LP64 || rex == 0);
5012b6e762cSahl
5022b6e762cSahl /*
5032b6e762cSahl * On amd64 we have to be careful not to confuse a nop
5042b6e762cSahl * (actually xchgl %eax, %eax) with an instruction using
5052b6e762cSahl * the same opcode, but that does something different
5062b6e762cSahl * (e.g. xchgl %r8d, %eax or xcghq %r8, %rax).
5072b6e762cSahl */
5082b6e762cSahl if (FASTTRAP_REX_B(rex) == 0)
5092b6e762cSahl tp->ftt_type = FASTTRAP_T_NOP;
5102b6e762cSahl break;
5112b6e762cSahl
5127c478bd9Sstevel@tonic-gate case FASTTRAP_INT3:
5137c478bd9Sstevel@tonic-gate /*
5147c478bd9Sstevel@tonic-gate * The pid provider shares the int3 trap with debugger
5157c478bd9Sstevel@tonic-gate * breakpoints so we can't instrument them.
5167c478bd9Sstevel@tonic-gate */
5177c478bd9Sstevel@tonic-gate ASSERT(instr[start] == FASTTRAP_INSTR);
5187c478bd9Sstevel@tonic-gate return (-1);
5199acbbeafSnn
5209acbbeafSnn case FASTTRAP_INT:
5219acbbeafSnn /*
5229acbbeafSnn * Interrupts seem like they could be traced with
5239acbbeafSnn * no negative implications, but it's possible that
5249acbbeafSnn * a thread could be redirected by the trap handling
5259acbbeafSnn * code which would eventually return to the
5269acbbeafSnn * instruction after the interrupt. If the interrupt
5279acbbeafSnn * were in our scratch space, the subsequent
5289acbbeafSnn * instruction might be overwritten before we return.
5299acbbeafSnn * Accordingly we refuse to instrument any interrupt.
5309acbbeafSnn */
5319acbbeafSnn return (-1);
5327c478bd9Sstevel@tonic-gate }
5337c478bd9Sstevel@tonic-gate }
5347c478bd9Sstevel@tonic-gate
5357c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64 && tp->ftt_type == FASTTRAP_T_COMMON) {
5367c478bd9Sstevel@tonic-gate /*
5377c478bd9Sstevel@tonic-gate * If the process is 64-bit and the instruction type is still
5387c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON -- meaning we're going to copy it out an
5397c478bd9Sstevel@tonic-gate * execute it -- we need to watch for %rip-relative
5407c478bd9Sstevel@tonic-gate * addressing mode. See the portion of fasttrap_pid_probe()
5417c478bd9Sstevel@tonic-gate * below where we handle tracepoints with type
5427c478bd9Sstevel@tonic-gate * FASTTRAP_T_COMMON for how we emulate instructions that
5437c478bd9Sstevel@tonic-gate * employ %rip-relative addressing.
5447c478bd9Sstevel@tonic-gate */
5457c478bd9Sstevel@tonic-gate if (rmindex != -1) {
5467c478bd9Sstevel@tonic-gate uint_t mod = FASTTRAP_MODRM_MOD(instr[rmindex]);
5477c478bd9Sstevel@tonic-gate uint_t reg = FASTTRAP_MODRM_REG(instr[rmindex]);
5487c478bd9Sstevel@tonic-gate uint_t rm = FASTTRAP_MODRM_RM(instr[rmindex]);
5497c478bd9Sstevel@tonic-gate
5507c478bd9Sstevel@tonic-gate ASSERT(rmindex > start);
5517c478bd9Sstevel@tonic-gate
5527c478bd9Sstevel@tonic-gate if (mod == 0 && rm == 5) {
5537c478bd9Sstevel@tonic-gate /*
5547c478bd9Sstevel@tonic-gate * We need to be sure to avoid other
5557c478bd9Sstevel@tonic-gate * registers used by this instruction. While
5567c478bd9Sstevel@tonic-gate * the reg field may determine the op code
5577c478bd9Sstevel@tonic-gate * rather than denoting a register, assuming
5587c478bd9Sstevel@tonic-gate * that it denotes a register is always safe.
5597c478bd9Sstevel@tonic-gate * We leave the REX field intact and use
5607c478bd9Sstevel@tonic-gate * whatever value's there for simplicity.
5617c478bd9Sstevel@tonic-gate */
5627c478bd9Sstevel@tonic-gate if (reg != 0) {
5637c478bd9Sstevel@tonic-gate tp->ftt_ripmode = FASTTRAP_RIP_1 |
5647c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_X *
5657c478bd9Sstevel@tonic-gate FASTTRAP_REX_B(rex));
5667c478bd9Sstevel@tonic-gate rm = 0;
5677c478bd9Sstevel@tonic-gate } else {
5687c478bd9Sstevel@tonic-gate tp->ftt_ripmode = FASTTRAP_RIP_2 |
5697c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_X *
5707c478bd9Sstevel@tonic-gate FASTTRAP_REX_B(rex));
5717c478bd9Sstevel@tonic-gate rm = 1;
5727c478bd9Sstevel@tonic-gate }
5737c478bd9Sstevel@tonic-gate
5747c478bd9Sstevel@tonic-gate tp->ftt_modrm = tp->ftt_instr[rmindex];
5757c478bd9Sstevel@tonic-gate tp->ftt_instr[rmindex] =
5767c478bd9Sstevel@tonic-gate FASTTRAP_MODRM(2, reg, rm);
5777c478bd9Sstevel@tonic-gate }
5787c478bd9Sstevel@tonic-gate }
5797c478bd9Sstevel@tonic-gate }
5807c478bd9Sstevel@tonic-gate
5817c478bd9Sstevel@tonic-gate return (0);
5827c478bd9Sstevel@tonic-gate }
5837c478bd9Sstevel@tonic-gate
5847c478bd9Sstevel@tonic-gate int
fasttrap_tracepoint_install(proc_t * p,fasttrap_tracepoint_t * tp)5857c478bd9Sstevel@tonic-gate fasttrap_tracepoint_install(proc_t *p, fasttrap_tracepoint_t *tp)
5867c478bd9Sstevel@tonic-gate {
5877c478bd9Sstevel@tonic-gate fasttrap_instr_t instr = FASTTRAP_INSTR;
5887c478bd9Sstevel@tonic-gate
5897c478bd9Sstevel@tonic-gate if (uwrite(p, &instr, 1, tp->ftt_pc) != 0)
5907c478bd9Sstevel@tonic-gate return (-1);
5917c478bd9Sstevel@tonic-gate
5927c478bd9Sstevel@tonic-gate return (0);
5937c478bd9Sstevel@tonic-gate }
5947c478bd9Sstevel@tonic-gate
5957c478bd9Sstevel@tonic-gate int
fasttrap_tracepoint_remove(proc_t * p,fasttrap_tracepoint_t * tp)5967c478bd9Sstevel@tonic-gate fasttrap_tracepoint_remove(proc_t *p, fasttrap_tracepoint_t *tp)
5977c478bd9Sstevel@tonic-gate {
5987c478bd9Sstevel@tonic-gate uint8_t instr;
5997c478bd9Sstevel@tonic-gate
6007c478bd9Sstevel@tonic-gate /*
6017c478bd9Sstevel@tonic-gate * Distinguish between read or write failures and a changed
6027c478bd9Sstevel@tonic-gate * instruction.
6037c478bd9Sstevel@tonic-gate */
6047c478bd9Sstevel@tonic-gate if (uread(p, &instr, 1, tp->ftt_pc) != 0)
6057c478bd9Sstevel@tonic-gate return (0);
6067c478bd9Sstevel@tonic-gate if (instr != FASTTRAP_INSTR)
6077c478bd9Sstevel@tonic-gate return (0);
6087c478bd9Sstevel@tonic-gate if (uwrite(p, &tp->ftt_instr[0], 1, tp->ftt_pc) != 0)
6097c478bd9Sstevel@tonic-gate return (-1);
6107c478bd9Sstevel@tonic-gate
6117c478bd9Sstevel@tonic-gate return (0);
6127c478bd9Sstevel@tonic-gate }
6137c478bd9Sstevel@tonic-gate
6147c478bd9Sstevel@tonic-gate static uintptr_t
fasttrap_fulword_noerr(const void * uaddr)6157c478bd9Sstevel@tonic-gate fasttrap_fulword_noerr(const void *uaddr)
6167c478bd9Sstevel@tonic-gate {
6177c478bd9Sstevel@tonic-gate uintptr_t ret;
6187c478bd9Sstevel@tonic-gate
6197c478bd9Sstevel@tonic-gate if (fasttrap_fulword(uaddr, &ret) == 0)
6207c478bd9Sstevel@tonic-gate return (ret);
6217c478bd9Sstevel@tonic-gate
6227c478bd9Sstevel@tonic-gate return (0);
6237c478bd9Sstevel@tonic-gate }
6247c478bd9Sstevel@tonic-gate
6257c478bd9Sstevel@tonic-gate static uint32_t
fasttrap_fuword32_noerr(const void * uaddr)6267c478bd9Sstevel@tonic-gate fasttrap_fuword32_noerr(const void *uaddr)
6277c478bd9Sstevel@tonic-gate {
6287c478bd9Sstevel@tonic-gate uint32_t ret;
6297c478bd9Sstevel@tonic-gate
6307c478bd9Sstevel@tonic-gate if (fasttrap_fuword32(uaddr, &ret) == 0)
6317c478bd9Sstevel@tonic-gate return (ret);
6327c478bd9Sstevel@tonic-gate
6337c478bd9Sstevel@tonic-gate return (0);
6347c478bd9Sstevel@tonic-gate }
6357c478bd9Sstevel@tonic-gate
6367c478bd9Sstevel@tonic-gate static void
fasttrap_return_common(struct regs * rp,uintptr_t pc,pid_t pid,uintptr_t new_pc)6377c478bd9Sstevel@tonic-gate fasttrap_return_common(struct regs *rp, uintptr_t pc, pid_t pid,
6387c478bd9Sstevel@tonic-gate uintptr_t new_pc)
6397c478bd9Sstevel@tonic-gate {
6407c478bd9Sstevel@tonic-gate fasttrap_tracepoint_t *tp;
6417c478bd9Sstevel@tonic-gate fasttrap_bucket_t *bucket;
6427c478bd9Sstevel@tonic-gate fasttrap_id_t *id;
6437c478bd9Sstevel@tonic-gate kmutex_t *pid_mtx;
6447c478bd9Sstevel@tonic-gate
6457c478bd9Sstevel@tonic-gate pid_mtx = &cpu_core[CPU->cpu_id].cpuc_pid_lock;
6467c478bd9Sstevel@tonic-gate mutex_enter(pid_mtx);
6477c478bd9Sstevel@tonic-gate bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
6487c478bd9Sstevel@tonic-gate
6497c478bd9Sstevel@tonic-gate for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
6507c478bd9Sstevel@tonic-gate if (pid == tp->ftt_pid && pc == tp->ftt_pc &&
651038dc6b3Sahl tp->ftt_proc->ftpc_acount != 0)
6527c478bd9Sstevel@tonic-gate break;
6537c478bd9Sstevel@tonic-gate }
6547c478bd9Sstevel@tonic-gate
6557c478bd9Sstevel@tonic-gate /*
6567c478bd9Sstevel@tonic-gate * Don't sweat it if we can't find the tracepoint again; unlike
6577c478bd9Sstevel@tonic-gate * when we're in fasttrap_pid_probe(), finding the tracepoint here
6587c478bd9Sstevel@tonic-gate * is not essential to the correct execution of the process.
6597c478bd9Sstevel@tonic-gate */
6607c478bd9Sstevel@tonic-gate if (tp == NULL) {
6617c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx);
6627c478bd9Sstevel@tonic-gate return;
6637c478bd9Sstevel@tonic-gate }
6647c478bd9Sstevel@tonic-gate
6657c478bd9Sstevel@tonic-gate for (id = tp->ftt_retids; id != NULL; id = id->fti_next) {
6667c478bd9Sstevel@tonic-gate /*
6677c478bd9Sstevel@tonic-gate * If there's a branch that could act as a return site, we
6687c478bd9Sstevel@tonic-gate * need to trace it, and check here if the program counter is
6697c478bd9Sstevel@tonic-gate * external to the function.
6707c478bd9Sstevel@tonic-gate */
6717c478bd9Sstevel@tonic-gate if (tp->ftt_type != FASTTRAP_T_RET &&
6727c478bd9Sstevel@tonic-gate tp->ftt_type != FASTTRAP_T_RET16 &&
6737c478bd9Sstevel@tonic-gate new_pc - id->fti_probe->ftp_faddr <
6747c478bd9Sstevel@tonic-gate id->fti_probe->ftp_fsize)
6757c478bd9Sstevel@tonic-gate continue;
6767c478bd9Sstevel@tonic-gate
6777c478bd9Sstevel@tonic-gate dtrace_probe(id->fti_probe->ftp_id,
6787c478bd9Sstevel@tonic-gate pc - id->fti_probe->ftp_faddr,
6797c478bd9Sstevel@tonic-gate rp->r_r0, rp->r_r1, 0, 0);
6807c478bd9Sstevel@tonic-gate }
6817c478bd9Sstevel@tonic-gate
6827c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx);
6837c478bd9Sstevel@tonic-gate }
6847c478bd9Sstevel@tonic-gate
6857c478bd9Sstevel@tonic-gate static void
fasttrap_sigsegv(proc_t * p,kthread_t * t,uintptr_t addr)6867c478bd9Sstevel@tonic-gate fasttrap_sigsegv(proc_t *p, kthread_t *t, uintptr_t addr)
6877c478bd9Sstevel@tonic-gate {
6887c478bd9Sstevel@tonic-gate sigqueue_t *sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP);
6897c478bd9Sstevel@tonic-gate
6907c478bd9Sstevel@tonic-gate sqp->sq_info.si_signo = SIGSEGV;
6917c478bd9Sstevel@tonic-gate sqp->sq_info.si_code = SEGV_MAPERR;
6927c478bd9Sstevel@tonic-gate sqp->sq_info.si_addr = (caddr_t)addr;
6937c478bd9Sstevel@tonic-gate
6947c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock);
6957c478bd9Sstevel@tonic-gate sigaddqa(p, t, sqp);
6967c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock);
6977c478bd9Sstevel@tonic-gate
6987c478bd9Sstevel@tonic-gate if (t != NULL)
6997c478bd9Sstevel@tonic-gate aston(t);
7007c478bd9Sstevel@tonic-gate }
7017c478bd9Sstevel@tonic-gate
7027c478bd9Sstevel@tonic-gate static void
fasttrap_usdt_args64(fasttrap_probe_t * probe,struct regs * rp,int argc,uintptr_t * argv)7037c478bd9Sstevel@tonic-gate fasttrap_usdt_args64(fasttrap_probe_t *probe, struct regs *rp, int argc,
7047c478bd9Sstevel@tonic-gate uintptr_t *argv)
7057c478bd9Sstevel@tonic-gate {
7067c478bd9Sstevel@tonic-gate int i, x, cap = MIN(argc, probe->ftp_nargs);
7077c478bd9Sstevel@tonic-gate uintptr_t *stack = (uintptr_t *)rp->r_sp;
7087c478bd9Sstevel@tonic-gate
7097c478bd9Sstevel@tonic-gate for (i = 0; i < cap; i++) {
7107c478bd9Sstevel@tonic-gate x = probe->ftp_argmap[i];
7117c478bd9Sstevel@tonic-gate
7127c478bd9Sstevel@tonic-gate if (x < 6)
7137c478bd9Sstevel@tonic-gate argv[i] = (&rp->r_rdi)[x];
7147c478bd9Sstevel@tonic-gate else
7157c478bd9Sstevel@tonic-gate argv[i] = fasttrap_fulword_noerr(&stack[x]);
7167c478bd9Sstevel@tonic-gate }
7177c478bd9Sstevel@tonic-gate
7187c478bd9Sstevel@tonic-gate for (; i < argc; i++) {
7197c478bd9Sstevel@tonic-gate argv[i] = 0;
7207c478bd9Sstevel@tonic-gate }
7217c478bd9Sstevel@tonic-gate }
7227c478bd9Sstevel@tonic-gate
7237c478bd9Sstevel@tonic-gate static void
fasttrap_usdt_args32(fasttrap_probe_t * probe,struct regs * rp,int argc,uint32_t * argv)7247c478bd9Sstevel@tonic-gate fasttrap_usdt_args32(fasttrap_probe_t *probe, struct regs *rp, int argc,
7257c478bd9Sstevel@tonic-gate uint32_t *argv)
7267c478bd9Sstevel@tonic-gate {
7277c478bd9Sstevel@tonic-gate int i, x, cap = MIN(argc, probe->ftp_nargs);
7287c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp;
7297c478bd9Sstevel@tonic-gate
7307c478bd9Sstevel@tonic-gate for (i = 0; i < cap; i++) {
7317c478bd9Sstevel@tonic-gate x = probe->ftp_argmap[i];
7327c478bd9Sstevel@tonic-gate
7337c478bd9Sstevel@tonic-gate argv[i] = fasttrap_fuword32_noerr(&stack[x]);
7347c478bd9Sstevel@tonic-gate }
7357c478bd9Sstevel@tonic-gate
7367c478bd9Sstevel@tonic-gate for (; i < argc; i++) {
7377c478bd9Sstevel@tonic-gate argv[i] = 0;
7387c478bd9Sstevel@tonic-gate }
7397c478bd9Sstevel@tonic-gate }
7407c478bd9Sstevel@tonic-gate
7419acbbeafSnn static int
fasttrap_do_seg(fasttrap_tracepoint_t * tp,struct regs * rp,uintptr_t * addr)7429acbbeafSnn fasttrap_do_seg(fasttrap_tracepoint_t *tp, struct regs *rp, uintptr_t *addr)
7439acbbeafSnn {
7449acbbeafSnn proc_t *p = curproc;
7459acbbeafSnn user_desc_t *desc;
7469acbbeafSnn uint16_t sel, ndx, type;
7479acbbeafSnn uintptr_t limit;
7489acbbeafSnn
7499acbbeafSnn switch (tp->ftt_segment) {
7509acbbeafSnn case FASTTRAP_SEG_CS:
7519acbbeafSnn sel = rp->r_cs;
7529acbbeafSnn break;
7539acbbeafSnn case FASTTRAP_SEG_DS:
7549acbbeafSnn sel = rp->r_ds;
7559acbbeafSnn break;
7569acbbeafSnn case FASTTRAP_SEG_ES:
7579acbbeafSnn sel = rp->r_es;
7589acbbeafSnn break;
7599acbbeafSnn case FASTTRAP_SEG_FS:
7609acbbeafSnn sel = rp->r_fs;
7619acbbeafSnn break;
7629acbbeafSnn case FASTTRAP_SEG_GS:
7639acbbeafSnn sel = rp->r_gs;
7649acbbeafSnn break;
7659acbbeafSnn case FASTTRAP_SEG_SS:
7669acbbeafSnn sel = rp->r_ss;
7679acbbeafSnn break;
7689acbbeafSnn }
7699acbbeafSnn
7709acbbeafSnn /*
7719acbbeafSnn * Make sure the given segment register specifies a user priority
7729acbbeafSnn * selector rather than a kernel selector.
7739acbbeafSnn */
7749acbbeafSnn if (!SELISUPL(sel))
7759acbbeafSnn return (-1);
7769acbbeafSnn
7779acbbeafSnn ndx = SELTOIDX(sel);
7789acbbeafSnn
7799acbbeafSnn /*
7809acbbeafSnn * Check the bounds and grab the descriptor out of the specified
7819acbbeafSnn * descriptor table.
7829acbbeafSnn */
7839acbbeafSnn if (SELISLDT(sel)) {
7849acbbeafSnn if (ndx > p->p_ldtlimit)
7859acbbeafSnn return (-1);
7869acbbeafSnn
7879acbbeafSnn desc = p->p_ldt + ndx;
7889acbbeafSnn
7899acbbeafSnn } else {
7909acbbeafSnn if (ndx >= NGDT)
7919acbbeafSnn return (-1);
7929acbbeafSnn
7939acbbeafSnn desc = cpu_get_gdt() + ndx;
7949acbbeafSnn }
7959acbbeafSnn
7969acbbeafSnn /*
7979acbbeafSnn * The descriptor must have user privilege level and it must be
7989acbbeafSnn * present in memory.
7999acbbeafSnn */
8009acbbeafSnn if (desc->usd_dpl != SEL_UPL || desc->usd_p != 1)
8019acbbeafSnn return (-1);
8029acbbeafSnn
8039acbbeafSnn type = desc->usd_type;
8049acbbeafSnn
8059acbbeafSnn /*
8069acbbeafSnn * If the S bit in the type field is not set, this descriptor can
8079acbbeafSnn * only be used in system context.
8089acbbeafSnn */
8099acbbeafSnn if ((type & 0x10) != 0x10)
8109acbbeafSnn return (-1);
8119acbbeafSnn
8129acbbeafSnn limit = USEGD_GETLIMIT(desc) * (desc->usd_gran ? PAGESIZE : 1);
8139acbbeafSnn
8149acbbeafSnn if (tp->ftt_segment == FASTTRAP_SEG_CS) {
8159acbbeafSnn /*
8169acbbeafSnn * The code/data bit and readable bit must both be set.
8179acbbeafSnn */
8189acbbeafSnn if ((type & 0xa) != 0xa)
8199acbbeafSnn return (-1);
8209acbbeafSnn
8219acbbeafSnn if (*addr > limit)
8229acbbeafSnn return (-1);
8239acbbeafSnn } else {
8249acbbeafSnn /*
8259acbbeafSnn * The code/data bit must be clear.
8269acbbeafSnn */
8279acbbeafSnn if ((type & 0x8) != 0)
8289acbbeafSnn return (-1);
8299acbbeafSnn
8309acbbeafSnn /*
8319acbbeafSnn * If the expand-down bit is clear, we just check the limit as
8329acbbeafSnn * it would naturally be applied. Otherwise, we need to check
8339acbbeafSnn * that the address is the range [limit + 1 .. 0xffff] or
8349acbbeafSnn * [limit + 1 ... 0xffffffff] depending on if the default
8359acbbeafSnn * operand size bit is set.
8369acbbeafSnn */
8379acbbeafSnn if ((type & 0x4) == 0) {
8389acbbeafSnn if (*addr > limit)
8399acbbeafSnn return (-1);
8409acbbeafSnn } else if (desc->usd_def32) {
8419acbbeafSnn if (*addr < limit + 1 || 0xffff < *addr)
8429acbbeafSnn return (-1);
8439acbbeafSnn } else {
8449acbbeafSnn if (*addr < limit + 1 || 0xffffffff < *addr)
8459acbbeafSnn return (-1);
8469acbbeafSnn }
8479acbbeafSnn }
8489acbbeafSnn
8499acbbeafSnn *addr += USEGD_GETBASE(desc);
8509acbbeafSnn
8519acbbeafSnn return (0);
8529acbbeafSnn }
8539acbbeafSnn
8547c478bd9Sstevel@tonic-gate int
fasttrap_pid_probe(struct regs * rp)8557c478bd9Sstevel@tonic-gate fasttrap_pid_probe(struct regs *rp)
8567c478bd9Sstevel@tonic-gate {
8577c478bd9Sstevel@tonic-gate proc_t *p = curproc;
8587c478bd9Sstevel@tonic-gate uintptr_t pc = rp->r_pc - 1, new_pc = 0;
8597c478bd9Sstevel@tonic-gate fasttrap_bucket_t *bucket;
8607c478bd9Sstevel@tonic-gate kmutex_t *pid_mtx;
8617c478bd9Sstevel@tonic-gate fasttrap_tracepoint_t *tp, tp_local;
8627c478bd9Sstevel@tonic-gate pid_t pid;
8637c478bd9Sstevel@tonic-gate dtrace_icookie_t cookie;
864ac448965Sahl uint_t is_enabled = 0;
8657c478bd9Sstevel@tonic-gate
8667c478bd9Sstevel@tonic-gate /*
8677c478bd9Sstevel@tonic-gate * It's possible that a user (in a veritable orgy of bad planning)
8687c478bd9Sstevel@tonic-gate * could redirect this thread's flow of control before it reached the
8697c478bd9Sstevel@tonic-gate * return probe fasttrap. In this case we need to kill the process
8707c478bd9Sstevel@tonic-gate * since it's in a unrecoverable state.
8717c478bd9Sstevel@tonic-gate */
8727c478bd9Sstevel@tonic-gate if (curthread->t_dtrace_step) {
8737c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_on);
8747c478bd9Sstevel@tonic-gate fasttrap_sigtrap(p, curthread, pc);
8757c478bd9Sstevel@tonic-gate return (0);
8767c478bd9Sstevel@tonic-gate }
8777c478bd9Sstevel@tonic-gate
8787c478bd9Sstevel@tonic-gate /*
8797c478bd9Sstevel@tonic-gate * Clear all user tracing flags.
8807c478bd9Sstevel@tonic-gate */
8817c478bd9Sstevel@tonic-gate curthread->t_dtrace_ft = 0;
8827c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = 0;
8837c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = 0;
8847c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = 0;
8857c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = 0;
8867c478bd9Sstevel@tonic-gate curthread->t_dtrace_regv = 0;
8877c478bd9Sstevel@tonic-gate
8887c478bd9Sstevel@tonic-gate /*
8897c478bd9Sstevel@tonic-gate * Treat a child created by a call to vfork(2) as if it were its
8907c478bd9Sstevel@tonic-gate * parent. We know that there's only one thread of control in such a
8917c478bd9Sstevel@tonic-gate * process: this one.
8927c478bd9Sstevel@tonic-gate */
8937c478bd9Sstevel@tonic-gate while (p->p_flag & SVFORK) {
8947c478bd9Sstevel@tonic-gate p = p->p_parent;
8957c478bd9Sstevel@tonic-gate }
8967c478bd9Sstevel@tonic-gate
8977c478bd9Sstevel@tonic-gate pid = p->p_pid;
8987c478bd9Sstevel@tonic-gate pid_mtx = &cpu_core[CPU->cpu_id].cpuc_pid_lock;
8997c478bd9Sstevel@tonic-gate mutex_enter(pid_mtx);
9007c478bd9Sstevel@tonic-gate bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
9017c478bd9Sstevel@tonic-gate
9027c478bd9Sstevel@tonic-gate /*
9037c478bd9Sstevel@tonic-gate * Lookup the tracepoint that the process just hit.
9047c478bd9Sstevel@tonic-gate */
9057c478bd9Sstevel@tonic-gate for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
9067c478bd9Sstevel@tonic-gate if (pid == tp->ftt_pid && pc == tp->ftt_pc &&
907038dc6b3Sahl tp->ftt_proc->ftpc_acount != 0)
9087c478bd9Sstevel@tonic-gate break;
9097c478bd9Sstevel@tonic-gate }
9107c478bd9Sstevel@tonic-gate
9117c478bd9Sstevel@tonic-gate /*
9127c478bd9Sstevel@tonic-gate * If we couldn't find a matching tracepoint, either a tracepoint has
9137c478bd9Sstevel@tonic-gate * been inserted without using the pid<pid> ioctl interface (see
9147c478bd9Sstevel@tonic-gate * fasttrap_ioctl), or somehow we have mislaid this tracepoint.
9157c478bd9Sstevel@tonic-gate */
9167c478bd9Sstevel@tonic-gate if (tp == NULL) {
9177c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx);
9187c478bd9Sstevel@tonic-gate return (-1);
9197c478bd9Sstevel@tonic-gate }
9207c478bd9Sstevel@tonic-gate
9217c478bd9Sstevel@tonic-gate /*
9227c478bd9Sstevel@tonic-gate * Set the program counter to the address of the traced instruction
9237c478bd9Sstevel@tonic-gate * so that it looks right in ustack() output.
9247c478bd9Sstevel@tonic-gate */
9257c478bd9Sstevel@tonic-gate rp->r_pc = pc;
9267c478bd9Sstevel@tonic-gate
9277c478bd9Sstevel@tonic-gate if (tp->ftt_ids != NULL) {
9287c478bd9Sstevel@tonic-gate fasttrap_id_t *id;
9297c478bd9Sstevel@tonic-gate
9307c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) {
9317c478bd9Sstevel@tonic-gate for (id = tp->ftt_ids; id != NULL; id = id->fti_next) {
9327c478bd9Sstevel@tonic-gate fasttrap_probe_t *probe = id->fti_probe;
9337c478bd9Sstevel@tonic-gate
934ac448965Sahl if (id->fti_ptype == DTFTP_ENTRY) {
9357c478bd9Sstevel@tonic-gate /*
9367c478bd9Sstevel@tonic-gate * We note that this was an entry
9377c478bd9Sstevel@tonic-gate * probe to help ustack() find the
9387c478bd9Sstevel@tonic-gate * first caller.
9397c478bd9Sstevel@tonic-gate */
9407c478bd9Sstevel@tonic-gate cookie = dtrace_interrupt_disable();
9417c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_ENTRY);
9427c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, rp->r_rdi,
9437c478bd9Sstevel@tonic-gate rp->r_rsi, rp->r_rdx, rp->r_rcx,
9447c478bd9Sstevel@tonic-gate rp->r_r8);
9457c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_ENTRY);
9467c478bd9Sstevel@tonic-gate dtrace_interrupt_enable(cookie);
947ac448965Sahl } else if (id->fti_ptype == DTFTP_IS_ENABLED) {
948ac448965Sahl /*
949ac448965Sahl * Note that in this case, we don't
950ac448965Sahl * call dtrace_probe() since it's only
951ac448965Sahl * an artificial probe meant to change
952ac448965Sahl * the flow of control so that it
953ac448965Sahl * encounters the true probe.
954ac448965Sahl */
955ac448965Sahl is_enabled = 1;
9567c478bd9Sstevel@tonic-gate } else if (probe->ftp_argmap == NULL) {
9577c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, rp->r_rdi,
9587c478bd9Sstevel@tonic-gate rp->r_rsi, rp->r_rdx, rp->r_rcx,
9597c478bd9Sstevel@tonic-gate rp->r_r8);
9607c478bd9Sstevel@tonic-gate } else {
9617c478bd9Sstevel@tonic-gate uintptr_t t[5];
9627c478bd9Sstevel@tonic-gate
9637c478bd9Sstevel@tonic-gate fasttrap_usdt_args64(probe, rp,
9647c478bd9Sstevel@tonic-gate sizeof (t) / sizeof (t[0]), t);
9657c478bd9Sstevel@tonic-gate
9667c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, t[0], t[1],
9677c478bd9Sstevel@tonic-gate t[2], t[3], t[4]);
9687c478bd9Sstevel@tonic-gate }
9697c478bd9Sstevel@tonic-gate }
9707c478bd9Sstevel@tonic-gate } else {
9717c478bd9Sstevel@tonic-gate uintptr_t s0, s1, s2, s3, s4, s5;
9727c478bd9Sstevel@tonic-gate uint32_t *stack = (uint32_t *)rp->r_sp;
9737c478bd9Sstevel@tonic-gate
9747c478bd9Sstevel@tonic-gate /*
9757c478bd9Sstevel@tonic-gate * In 32-bit mode, all arguments are passed on the
9767c478bd9Sstevel@tonic-gate * stack. If this is a function entry probe, we need
9777c478bd9Sstevel@tonic-gate * to skip the first entry on the stack as it
9787c478bd9Sstevel@tonic-gate * represents the return address rather than a
9797c478bd9Sstevel@tonic-gate * parameter to the function.
9807c478bd9Sstevel@tonic-gate */
9817c478bd9Sstevel@tonic-gate s0 = fasttrap_fuword32_noerr(&stack[0]);
9827c478bd9Sstevel@tonic-gate s1 = fasttrap_fuword32_noerr(&stack[1]);
9837c478bd9Sstevel@tonic-gate s2 = fasttrap_fuword32_noerr(&stack[2]);
9847c478bd9Sstevel@tonic-gate s3 = fasttrap_fuword32_noerr(&stack[3]);
9857c478bd9Sstevel@tonic-gate s4 = fasttrap_fuword32_noerr(&stack[4]);
9867c478bd9Sstevel@tonic-gate s5 = fasttrap_fuword32_noerr(&stack[5]);
9877c478bd9Sstevel@tonic-gate
9887c478bd9Sstevel@tonic-gate for (id = tp->ftt_ids; id != NULL; id = id->fti_next) {
9897c478bd9Sstevel@tonic-gate fasttrap_probe_t *probe = id->fti_probe;
9907c478bd9Sstevel@tonic-gate
991ac448965Sahl if (id->fti_ptype == DTFTP_ENTRY) {
9927c478bd9Sstevel@tonic-gate /*
9937c478bd9Sstevel@tonic-gate * We note that this was an entry
9947c478bd9Sstevel@tonic-gate * probe to help ustack() find the
9957c478bd9Sstevel@tonic-gate * first caller.
9967c478bd9Sstevel@tonic-gate */
9977c478bd9Sstevel@tonic-gate cookie = dtrace_interrupt_disable();
9987c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_SET(CPU_DTRACE_ENTRY);
9997c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, s1, s2,
10007c478bd9Sstevel@tonic-gate s3, s4, s5);
10017c478bd9Sstevel@tonic-gate DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_ENTRY);
10027c478bd9Sstevel@tonic-gate dtrace_interrupt_enable(cookie);
1003ac448965Sahl } else if (id->fti_ptype == DTFTP_IS_ENABLED) {
1004ac448965Sahl /*
1005ac448965Sahl * Note that in this case, we don't
1006ac448965Sahl * call dtrace_probe() since it's only
1007ac448965Sahl * an artificial probe meant to change
1008ac448965Sahl * the flow of control so that it
1009ac448965Sahl * encounters the true probe.
1010ac448965Sahl */
1011ac448965Sahl is_enabled = 1;
10127c478bd9Sstevel@tonic-gate } else if (probe->ftp_argmap == NULL) {
10137c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, s0, s1,
10147c478bd9Sstevel@tonic-gate s2, s3, s4);
10157c478bd9Sstevel@tonic-gate } else {
10167c478bd9Sstevel@tonic-gate uint32_t t[5];
10177c478bd9Sstevel@tonic-gate
10187c478bd9Sstevel@tonic-gate fasttrap_usdt_args32(probe, rp,
10197c478bd9Sstevel@tonic-gate sizeof (t) / sizeof (t[0]), t);
10207c478bd9Sstevel@tonic-gate
10217c478bd9Sstevel@tonic-gate dtrace_probe(probe->ftp_id, t[0], t[1],
10227c478bd9Sstevel@tonic-gate t[2], t[3], t[4]);
10237c478bd9Sstevel@tonic-gate }
10247c478bd9Sstevel@tonic-gate }
10257c478bd9Sstevel@tonic-gate }
10267c478bd9Sstevel@tonic-gate }
10277c478bd9Sstevel@tonic-gate
10287c478bd9Sstevel@tonic-gate /*
10297c478bd9Sstevel@tonic-gate * We're about to do a bunch of work so we cache a local copy of
10307c478bd9Sstevel@tonic-gate * the tracepoint to emulate the instruction, and then find the
10317c478bd9Sstevel@tonic-gate * tracepoint again later if we need to light up any return probes.
10327c478bd9Sstevel@tonic-gate */
10337c478bd9Sstevel@tonic-gate tp_local = *tp;
10347c478bd9Sstevel@tonic-gate mutex_exit(pid_mtx);
10357c478bd9Sstevel@tonic-gate tp = &tp_local;
10367c478bd9Sstevel@tonic-gate
10377c478bd9Sstevel@tonic-gate /*
10387c478bd9Sstevel@tonic-gate * Set the program counter to appear as though the traced instruction
10397c478bd9Sstevel@tonic-gate * had completely executed. This ensures that fasttrap_getreg() will
10407c478bd9Sstevel@tonic-gate * report the expected value for REG_RIP.
10417c478bd9Sstevel@tonic-gate */
10427c478bd9Sstevel@tonic-gate rp->r_pc = pc + tp->ftt_size;
10437c478bd9Sstevel@tonic-gate
1044ac448965Sahl /*
1045ac448965Sahl * If there's an is-enabled probe connected to this tracepoint it
1046ac448965Sahl * means that there was a 'xorl %eax, %eax' or 'xorq %rax, %rax'
1047ac448965Sahl * instruction that was placed there by DTrace when the binary was
1048ac448965Sahl * linked. As this probe is, in fact, enabled, we need to stuff 1
1049ac448965Sahl * into %eax or %rax. Accordingly, we can bypass all the instruction
1050ac448965Sahl * emulation logic since we know the inevitable result. It's possible
1051ac448965Sahl * that a user could construct a scenario where the 'is-enabled'
1052ac448965Sahl * probe was on some other instruction, but that would be a rather
1053ac448965Sahl * exotic way to shoot oneself in the foot.
1054ac448965Sahl */
1055ac448965Sahl if (is_enabled) {
1056ac448965Sahl rp->r_r0 = 1;
1057ac448965Sahl new_pc = rp->r_pc;
1058ac448965Sahl goto done;
1059ac448965Sahl }
1060ac448965Sahl
1061ac448965Sahl /*
1062ac448965Sahl * We emulate certain types of instructions to ensure correctness
1063ac448965Sahl * (in the case of position dependent instructions) or optimize
1064ac448965Sahl * common cases. The rest we have the thread execute back in user-
1065ac448965Sahl * land.
1066ac448965Sahl */
10677c478bd9Sstevel@tonic-gate switch (tp->ftt_type) {
10687c478bd9Sstevel@tonic-gate case FASTTRAP_T_RET:
10697c478bd9Sstevel@tonic-gate case FASTTRAP_T_RET16:
10707c478bd9Sstevel@tonic-gate {
10717c478bd9Sstevel@tonic-gate uintptr_t dst;
10727c478bd9Sstevel@tonic-gate uintptr_t addr;
10737c478bd9Sstevel@tonic-gate int ret;
10747c478bd9Sstevel@tonic-gate
10757c478bd9Sstevel@tonic-gate /*
10767c478bd9Sstevel@tonic-gate * We have to emulate _every_ facet of the behavior of a ret
10777c478bd9Sstevel@tonic-gate * instruction including what happens if the load from %esp
10787c478bd9Sstevel@tonic-gate * fails; in that case, we send a SIGSEGV.
10797c478bd9Sstevel@tonic-gate */
10807c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) {
10817c478bd9Sstevel@tonic-gate ret = fasttrap_fulword((void *)rp->r_sp, &dst);
10827c478bd9Sstevel@tonic-gate addr = rp->r_sp + sizeof (uintptr_t);
10837c478bd9Sstevel@tonic-gate } else {
10847c478bd9Sstevel@tonic-gate uint32_t dst32;
10857c478bd9Sstevel@tonic-gate ret = fasttrap_fuword32((void *)rp->r_sp, &dst32);
10867c478bd9Sstevel@tonic-gate dst = dst32;
10877c478bd9Sstevel@tonic-gate addr = rp->r_sp + sizeof (uint32_t);
10887c478bd9Sstevel@tonic-gate }
10897c478bd9Sstevel@tonic-gate
10907c478bd9Sstevel@tonic-gate if (ret == -1) {
10917c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, rp->r_sp);
10927c478bd9Sstevel@tonic-gate new_pc = pc;
10937c478bd9Sstevel@tonic-gate break;
10947c478bd9Sstevel@tonic-gate }
10957c478bd9Sstevel@tonic-gate
10967c478bd9Sstevel@tonic-gate if (tp->ftt_type == FASTTRAP_T_RET16)
10977c478bd9Sstevel@tonic-gate addr += tp->ftt_dest;
10987c478bd9Sstevel@tonic-gate
10997c478bd9Sstevel@tonic-gate rp->r_sp = addr;
11007c478bd9Sstevel@tonic-gate new_pc = dst;
11017c478bd9Sstevel@tonic-gate break;
11027c478bd9Sstevel@tonic-gate }
11037c478bd9Sstevel@tonic-gate
11047c478bd9Sstevel@tonic-gate case FASTTRAP_T_JCC:
11057c478bd9Sstevel@tonic-gate {
11067c478bd9Sstevel@tonic-gate uint_t taken;
11077c478bd9Sstevel@tonic-gate
11087c478bd9Sstevel@tonic-gate switch (tp->ftt_code) {
11097c478bd9Sstevel@tonic-gate case FASTTRAP_JO:
11107c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_OF) != 0;
11117c478bd9Sstevel@tonic-gate break;
11127c478bd9Sstevel@tonic-gate case FASTTRAP_JNO:
11137c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_OF) == 0;
11147c478bd9Sstevel@tonic-gate break;
11157c478bd9Sstevel@tonic-gate case FASTTRAP_JB:
11167c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) != 0;
11177c478bd9Sstevel@tonic-gate break;
11187c478bd9Sstevel@tonic-gate case FASTTRAP_JAE:
11197c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) == 0;
11207c478bd9Sstevel@tonic-gate break;
11217c478bd9Sstevel@tonic-gate case FASTTRAP_JE:
11227c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0;
11237c478bd9Sstevel@tonic-gate break;
11247c478bd9Sstevel@tonic-gate case FASTTRAP_JNE:
11257c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0;
11267c478bd9Sstevel@tonic-gate break;
11277c478bd9Sstevel@tonic-gate case FASTTRAP_JBE:
11287c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) != 0 ||
11297c478bd9Sstevel@tonic-gate (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0;
11307c478bd9Sstevel@tonic-gate break;
11317c478bd9Sstevel@tonic-gate case FASTTRAP_JA:
11327c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_CF) == 0 &&
11337c478bd9Sstevel@tonic-gate (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0;
11347c478bd9Sstevel@tonic-gate break;
11357c478bd9Sstevel@tonic-gate case FASTTRAP_JS:
11367c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) != 0;
11377c478bd9Sstevel@tonic-gate break;
11387c478bd9Sstevel@tonic-gate case FASTTRAP_JNS:
11397c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_SF) == 0;
11407c478bd9Sstevel@tonic-gate break;
11417c478bd9Sstevel@tonic-gate case FASTTRAP_JP:
11427c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_PF) != 0;
11437c478bd9Sstevel@tonic-gate break;
11447c478bd9Sstevel@tonic-gate case FASTTRAP_JNP:
11457c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_PF) == 0;
11467c478bd9Sstevel@tonic-gate break;
11477c478bd9Sstevel@tonic-gate case FASTTRAP_JL:
11487c478bd9Sstevel@tonic-gate taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) !=
11497c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0);
11507c478bd9Sstevel@tonic-gate break;
11517c478bd9Sstevel@tonic-gate case FASTTRAP_JGE:
11527c478bd9Sstevel@tonic-gate taken = ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) ==
11537c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0);
11547c478bd9Sstevel@tonic-gate break;
11557c478bd9Sstevel@tonic-gate case FASTTRAP_JLE:
11567c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0 ||
11577c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) !=
11587c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0);
11597c478bd9Sstevel@tonic-gate break;
11607c478bd9Sstevel@tonic-gate case FASTTRAP_JG:
11617c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0 &&
11627c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_SF) == 0) ==
11637c478bd9Sstevel@tonic-gate ((rp->r_ps & FASTTRAP_EFLAGS_OF) == 0);
11647c478bd9Sstevel@tonic-gate break;
11657c478bd9Sstevel@tonic-gate
11667c478bd9Sstevel@tonic-gate }
11677c478bd9Sstevel@tonic-gate
11687c478bd9Sstevel@tonic-gate if (taken)
11697c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest;
11707c478bd9Sstevel@tonic-gate else
11717c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size;
11727c478bd9Sstevel@tonic-gate break;
11737c478bd9Sstevel@tonic-gate }
11747c478bd9Sstevel@tonic-gate
11757c478bd9Sstevel@tonic-gate case FASTTRAP_T_LOOP:
11767c478bd9Sstevel@tonic-gate {
11777c478bd9Sstevel@tonic-gate uint_t taken;
11787c478bd9Sstevel@tonic-gate greg_t cx = rp->r_rcx--;
11797c478bd9Sstevel@tonic-gate
11807c478bd9Sstevel@tonic-gate switch (tp->ftt_code) {
11817c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPNZ:
11827c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) == 0 &&
11837c478bd9Sstevel@tonic-gate cx != 0;
11847c478bd9Sstevel@tonic-gate break;
11857c478bd9Sstevel@tonic-gate case FASTTRAP_LOOPZ:
11867c478bd9Sstevel@tonic-gate taken = (rp->r_ps & FASTTRAP_EFLAGS_ZF) != 0 &&
11877c478bd9Sstevel@tonic-gate cx != 0;
11887c478bd9Sstevel@tonic-gate break;
11897c478bd9Sstevel@tonic-gate case FASTTRAP_LOOP:
11907c478bd9Sstevel@tonic-gate taken = (cx != 0);
11917c478bd9Sstevel@tonic-gate break;
11927c478bd9Sstevel@tonic-gate }
11937c478bd9Sstevel@tonic-gate
11947c478bd9Sstevel@tonic-gate if (taken)
11957c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest;
11967c478bd9Sstevel@tonic-gate else
11977c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size;
11987c478bd9Sstevel@tonic-gate break;
11997c478bd9Sstevel@tonic-gate }
12007c478bd9Sstevel@tonic-gate
12017c478bd9Sstevel@tonic-gate case FASTTRAP_T_JCXZ:
12027c478bd9Sstevel@tonic-gate {
12037c478bd9Sstevel@tonic-gate greg_t cx = rp->r_rcx;
12047c478bd9Sstevel@tonic-gate
12057c478bd9Sstevel@tonic-gate if (cx == 0)
12067c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest;
12077c478bd9Sstevel@tonic-gate else
12087c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size;
12097c478bd9Sstevel@tonic-gate break;
12107c478bd9Sstevel@tonic-gate }
12117c478bd9Sstevel@tonic-gate
12127c478bd9Sstevel@tonic-gate case FASTTRAP_T_PUSHL_EBP:
12137c478bd9Sstevel@tonic-gate {
12147c478bd9Sstevel@tonic-gate int ret;
12157c478bd9Sstevel@tonic-gate uintptr_t addr;
12167c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) {
12177c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uintptr_t);
12187c478bd9Sstevel@tonic-gate ret = fasttrap_sulword((void *)addr, rp->r_fp);
12197c478bd9Sstevel@tonic-gate } else {
12207c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uint32_t);
12217c478bd9Sstevel@tonic-gate ret = fasttrap_suword32((void *)addr,
12227c478bd9Sstevel@tonic-gate (uint32_t)rp->r_fp);
12237c478bd9Sstevel@tonic-gate }
12247c478bd9Sstevel@tonic-gate
12257c478bd9Sstevel@tonic-gate if (ret == -1) {
12267c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, addr);
12277c478bd9Sstevel@tonic-gate new_pc = pc;
12287c478bd9Sstevel@tonic-gate break;
12297c478bd9Sstevel@tonic-gate }
12307c478bd9Sstevel@tonic-gate
12317c478bd9Sstevel@tonic-gate rp->r_sp = addr;
12327c478bd9Sstevel@tonic-gate new_pc = pc + tp->ftt_size;
12337c478bd9Sstevel@tonic-gate break;
12347c478bd9Sstevel@tonic-gate }
12357c478bd9Sstevel@tonic-gate
12362b6e762cSahl case FASTTRAP_T_NOP:
12372b6e762cSahl new_pc = pc + tp->ftt_size;
12382b6e762cSahl break;
12392b6e762cSahl
12407c478bd9Sstevel@tonic-gate case FASTTRAP_T_JMP:
12417c478bd9Sstevel@tonic-gate case FASTTRAP_T_CALL:
12427c478bd9Sstevel@tonic-gate if (tp->ftt_code == 0) {
12437c478bd9Sstevel@tonic-gate new_pc = tp->ftt_dest;
12447c478bd9Sstevel@tonic-gate } else {
12459acbbeafSnn uintptr_t value, addr = tp->ftt_dest;
12467c478bd9Sstevel@tonic-gate
12477c478bd9Sstevel@tonic-gate if (tp->ftt_base != FASTTRAP_NOREG)
12487c478bd9Sstevel@tonic-gate addr += fasttrap_getreg(rp, tp->ftt_base);
12497c478bd9Sstevel@tonic-gate if (tp->ftt_index != FASTTRAP_NOREG)
12507c478bd9Sstevel@tonic-gate addr += fasttrap_getreg(rp, tp->ftt_index) <<
12517c478bd9Sstevel@tonic-gate tp->ftt_scale;
12527c478bd9Sstevel@tonic-gate
12537c478bd9Sstevel@tonic-gate if (tp->ftt_code == 1) {
12549acbbeafSnn /*
12559acbbeafSnn * If there's a segment prefix for this
12569acbbeafSnn * instruction, we'll need to check permissions
12579acbbeafSnn * and bounds on the given selector, and adjust
12589acbbeafSnn * the address accordingly.
12599acbbeafSnn */
12609acbbeafSnn if (tp->ftt_segment != FASTTRAP_SEG_NONE &&
12619acbbeafSnn fasttrap_do_seg(tp, rp, &addr) != 0) {
12629acbbeafSnn fasttrap_sigsegv(p, curthread, addr);
12639acbbeafSnn new_pc = pc;
12649acbbeafSnn break;
12659acbbeafSnn }
12669acbbeafSnn
12677c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) {
12687c478bd9Sstevel@tonic-gate if (fasttrap_fulword((void *)addr,
12697c478bd9Sstevel@tonic-gate &value) == -1) {
12707c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread,
12717c478bd9Sstevel@tonic-gate addr);
12727c478bd9Sstevel@tonic-gate new_pc = pc;
12737c478bd9Sstevel@tonic-gate break;
12747c478bd9Sstevel@tonic-gate }
12757c478bd9Sstevel@tonic-gate new_pc = value;
12767c478bd9Sstevel@tonic-gate } else {
12779acbbeafSnn uint32_t value32;
12789acbbeafSnn addr = (uintptr_t)(uint32_t)addr;
12797c478bd9Sstevel@tonic-gate if (fasttrap_fuword32((void *)addr,
12809acbbeafSnn &value32) == -1) {
12817c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread,
12827c478bd9Sstevel@tonic-gate addr);
12837c478bd9Sstevel@tonic-gate new_pc = pc;
12847c478bd9Sstevel@tonic-gate break;
12857c478bd9Sstevel@tonic-gate }
12869acbbeafSnn new_pc = value32;
12877c478bd9Sstevel@tonic-gate }
12887c478bd9Sstevel@tonic-gate } else {
12897c478bd9Sstevel@tonic-gate new_pc = addr;
12907c478bd9Sstevel@tonic-gate }
12917c478bd9Sstevel@tonic-gate }
12927c478bd9Sstevel@tonic-gate
12937c478bd9Sstevel@tonic-gate /*
12947c478bd9Sstevel@tonic-gate * If this is a call instruction, we need to push the return
12957c478bd9Sstevel@tonic-gate * address onto the stack. If this fails, we send the process
12967c478bd9Sstevel@tonic-gate * a SIGSEGV and reset the pc to emulate what would happen if
12977c478bd9Sstevel@tonic-gate * this instruction weren't traced.
12987c478bd9Sstevel@tonic-gate */
12997c478bd9Sstevel@tonic-gate if (tp->ftt_type == FASTTRAP_T_CALL) {
13007c478bd9Sstevel@tonic-gate int ret;
13017c478bd9Sstevel@tonic-gate uintptr_t addr;
13027c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_NATIVE) {
13037c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uintptr_t);
13047c478bd9Sstevel@tonic-gate ret = fasttrap_sulword((void *)addr,
13057c478bd9Sstevel@tonic-gate pc + tp->ftt_size);
13067c478bd9Sstevel@tonic-gate } else {
13077c478bd9Sstevel@tonic-gate addr = rp->r_sp - sizeof (uint32_t);
13087c478bd9Sstevel@tonic-gate ret = fasttrap_suword32((void *)addr,
13097c478bd9Sstevel@tonic-gate (uint32_t)(pc + tp->ftt_size));
13107c478bd9Sstevel@tonic-gate }
13117c478bd9Sstevel@tonic-gate
13127c478bd9Sstevel@tonic-gate if (ret == -1) {
13137c478bd9Sstevel@tonic-gate fasttrap_sigsegv(p, curthread, addr);
13147c478bd9Sstevel@tonic-gate new_pc = pc;
13157c478bd9Sstevel@tonic-gate break;
13167c478bd9Sstevel@tonic-gate }
13177c478bd9Sstevel@tonic-gate
13187c478bd9Sstevel@tonic-gate rp->r_sp = addr;
13197c478bd9Sstevel@tonic-gate }
13207c478bd9Sstevel@tonic-gate
13217c478bd9Sstevel@tonic-gate break;
13227c478bd9Sstevel@tonic-gate
13237c478bd9Sstevel@tonic-gate case FASTTRAP_T_COMMON:
13247c478bd9Sstevel@tonic-gate {
13257c478bd9Sstevel@tonic-gate uintptr_t addr;
13266009dbc6Sahl uint8_t scratch[2 * FASTTRAP_MAX_INSTR_SIZE + 22];
13277c478bd9Sstevel@tonic-gate uint_t i = 0;
13287c478bd9Sstevel@tonic-gate klwp_t *lwp = ttolwp(curthread);
13297c478bd9Sstevel@tonic-gate
13307c478bd9Sstevel@tonic-gate /*
13317c478bd9Sstevel@tonic-gate * Compute the address of the ulwp_t and step over the
13327c478bd9Sstevel@tonic-gate * ul_self pointer. The method used to store the user-land
13337c478bd9Sstevel@tonic-gate * thread pointer is very different on 32- and 64-bit
13347c478bd9Sstevel@tonic-gate * kernels.
13357c478bd9Sstevel@tonic-gate */
13367c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) {
13377c478bd9Sstevel@tonic-gate addr = lwp->lwp_pcb.pcb_fsbase;
13387c478bd9Sstevel@tonic-gate addr += sizeof (void *);
13397c478bd9Sstevel@tonic-gate } else {
13407c478bd9Sstevel@tonic-gate addr = lwp->lwp_pcb.pcb_gsbase;
13417c478bd9Sstevel@tonic-gate addr += sizeof (caddr32_t);
13427c478bd9Sstevel@tonic-gate }
13437c478bd9Sstevel@tonic-gate
13447c478bd9Sstevel@tonic-gate /*
13457c478bd9Sstevel@tonic-gate * Generic Instruction Tracing
13467c478bd9Sstevel@tonic-gate * ---------------------------
13477c478bd9Sstevel@tonic-gate *
13487c478bd9Sstevel@tonic-gate * This is the layout of the scratch space in the user-land
13497c478bd9Sstevel@tonic-gate * thread structure for our generated instructions.
13507c478bd9Sstevel@tonic-gate *
13517c478bd9Sstevel@tonic-gate * 32-bit mode bytes
13527c478bd9Sstevel@tonic-gate * ------------------------ -----
13537c478bd9Sstevel@tonic-gate * a: <original instruction> <= 15
13547c478bd9Sstevel@tonic-gate * jmp <pc + tp->ftt_size> 5
13557c478bd9Sstevel@tonic-gate * b: <original instrction> <= 15
13567c478bd9Sstevel@tonic-gate * int T_DTRACE_RET 2
13577c478bd9Sstevel@tonic-gate * -----
13587c478bd9Sstevel@tonic-gate * <= 37
13597c478bd9Sstevel@tonic-gate *
13607c478bd9Sstevel@tonic-gate * 64-bit mode bytes
13617c478bd9Sstevel@tonic-gate * ------------------------ -----
13627c478bd9Sstevel@tonic-gate * a: <original instruction> <= 15
13637c478bd9Sstevel@tonic-gate * jmp 0(%rip) 6
13647c478bd9Sstevel@tonic-gate * <pc + tp->ftt_size> 8
13657c478bd9Sstevel@tonic-gate * b: <original instruction> <= 15
1366*86ef0a63SRichard Lowe * int T_DTRACE_RET 2
1367*86ef0a63SRichard Lowe * -----
1368*86ef0a63SRichard Lowe * <= 46
13697c478bd9Sstevel@tonic-gate *
13707c478bd9Sstevel@tonic-gate * The %pc is set to a, and curthread->t_dtrace_astpc is set
13717c478bd9Sstevel@tonic-gate * to b. If we encounter a signal on the way out of the
13727c478bd9Sstevel@tonic-gate * kernel, trap() will set %pc to curthread->t_dtrace_astpc
13737c478bd9Sstevel@tonic-gate * so that we execute the original instruction and re-enter
13747c478bd9Sstevel@tonic-gate * the kernel rather than redirecting to the next instruction.
13757c478bd9Sstevel@tonic-gate *
13767c478bd9Sstevel@tonic-gate * If there are return probes (so we know that we're going to
13777c478bd9Sstevel@tonic-gate * need to reenter the kernel after executing the original
13787c478bd9Sstevel@tonic-gate * instruction), the scratch space will just contain the
13797c478bd9Sstevel@tonic-gate * original instruction followed by an interrupt -- the same
13807c478bd9Sstevel@tonic-gate * data as at b.
13817c478bd9Sstevel@tonic-gate *
13827c478bd9Sstevel@tonic-gate * %rip-relative Addressing
13837c478bd9Sstevel@tonic-gate * ------------------------
13847c478bd9Sstevel@tonic-gate *
13857c478bd9Sstevel@tonic-gate * There's a further complication in 64-bit mode due to %rip-
13867c478bd9Sstevel@tonic-gate * relative addressing. While this is clearly a beneficial
13877c478bd9Sstevel@tonic-gate * architectural decision for position independent code, it's
13887c478bd9Sstevel@tonic-gate * hard not to see it as a personal attack against the pid
13897c478bd9Sstevel@tonic-gate * provider since before there was a relatively small set of
13907c478bd9Sstevel@tonic-gate * instructions to emulate; with %rip-relative addressing,
13917c478bd9Sstevel@tonic-gate * almost every instruction can potentially depend on the
13927c478bd9Sstevel@tonic-gate * address at which it's executed. Rather than emulating
13937c478bd9Sstevel@tonic-gate * the broad spectrum of instructions that can now be
13947c478bd9Sstevel@tonic-gate * position dependent, we emulate jumps and others as in
13957c478bd9Sstevel@tonic-gate * 32-bit mode, and take a different tack for instructions
13967c478bd9Sstevel@tonic-gate * using %rip-relative addressing.
13977c478bd9Sstevel@tonic-gate *
13987c478bd9Sstevel@tonic-gate * For every instruction that uses the ModRM byte, the
13997c478bd9Sstevel@tonic-gate * in-kernel disassembler reports its location. We use the
14007c478bd9Sstevel@tonic-gate * ModRM byte to identify that an instruction uses
14017c478bd9Sstevel@tonic-gate * %rip-relative addressing and to see what other registers
14027c478bd9Sstevel@tonic-gate * the instruction uses. To emulate those instructions,
14037c478bd9Sstevel@tonic-gate * we modify the instruction to be %rax-relative rather than
14047c478bd9Sstevel@tonic-gate * %rip-relative (or %rcx-relative if the instruction uses
14057c478bd9Sstevel@tonic-gate * %rax; or %r8- or %r9-relative if the REX.B is present so
14067c478bd9Sstevel@tonic-gate * we don't have to rewrite the REX prefix). We then load
14077c478bd9Sstevel@tonic-gate * the value that %rip would have been into the scratch
14087c478bd9Sstevel@tonic-gate * register and generate an instruction to reset the scratch
14097c478bd9Sstevel@tonic-gate * register back to its original value. The instruction
14107c478bd9Sstevel@tonic-gate * sequence looks like this:
14117c478bd9Sstevel@tonic-gate *
14127c478bd9Sstevel@tonic-gate * 64-mode %rip-relative bytes
14137c478bd9Sstevel@tonic-gate * ------------------------ -----
14147c478bd9Sstevel@tonic-gate * a: <modified instruction> <= 15
14157c478bd9Sstevel@tonic-gate * movq $<value>, %<scratch> 6
14167c478bd9Sstevel@tonic-gate * jmp 0(%rip) 6
14177c478bd9Sstevel@tonic-gate * <pc + tp->ftt_size> 8
1418*86ef0a63SRichard Lowe * b: <modified instruction> <= 15
1419*86ef0a63SRichard Lowe * int T_DTRACE_RET 2
1420*86ef0a63SRichard Lowe * -----
14217c478bd9Sstevel@tonic-gate * 52
14227c478bd9Sstevel@tonic-gate *
14237c478bd9Sstevel@tonic-gate * We set curthread->t_dtrace_regv so that upon receiving
14247c478bd9Sstevel@tonic-gate * a signal we can reset the value of the scratch register.
14257c478bd9Sstevel@tonic-gate */
14267c478bd9Sstevel@tonic-gate
14277c478bd9Sstevel@tonic-gate ASSERT(tp->ftt_size < FASTTRAP_MAX_INSTR_SIZE);
14287c478bd9Sstevel@tonic-gate
14297c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = addr;
14307c478bd9Sstevel@tonic-gate bcopy(tp->ftt_instr, &scratch[i], tp->ftt_size);
14317c478bd9Sstevel@tonic-gate i += tp->ftt_size;
14327c478bd9Sstevel@tonic-gate
14337c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode != 0) {
14347c478bd9Sstevel@tonic-gate greg_t *reg;
14357c478bd9Sstevel@tonic-gate
14367c478bd9Sstevel@tonic-gate ASSERT(p->p_model == DATAMODEL_LP64);
14377c478bd9Sstevel@tonic-gate ASSERT(tp->ftt_ripmode &
14387c478bd9Sstevel@tonic-gate (FASTTRAP_RIP_1 | FASTTRAP_RIP_2));
14397c478bd9Sstevel@tonic-gate
14407c478bd9Sstevel@tonic-gate /*
14417c478bd9Sstevel@tonic-gate * If this was a %rip-relative instruction, we change
14427c478bd9Sstevel@tonic-gate * it to be either a %rax- or %rcx-relative
14437c478bd9Sstevel@tonic-gate * instruction (depending on whether those registers
14447c478bd9Sstevel@tonic-gate * are used as another operand; or %r8- or %r9-
14457c478bd9Sstevel@tonic-gate * relative depending on the value of REX.B). We then
14467c478bd9Sstevel@tonic-gate * set that register and generate a movq instruction
14477c478bd9Sstevel@tonic-gate * to reset the value.
14487c478bd9Sstevel@tonic-gate */
14497c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode & FASTTRAP_RIP_X)
14507c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_REX(1, 0, 0, 1);
14517c478bd9Sstevel@tonic-gate else
14527c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_REX(1, 0, 0, 0);
14537c478bd9Sstevel@tonic-gate
14547c478bd9Sstevel@tonic-gate if (tp->ftt_ripmode & FASTTRAP_RIP_1)
14557c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MOV_EAX;
14567c478bd9Sstevel@tonic-gate else
14577c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MOV_ECX;
14587c478bd9Sstevel@tonic-gate
14597c478bd9Sstevel@tonic-gate switch (tp->ftt_ripmode) {
14607c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_1:
14617c478bd9Sstevel@tonic-gate reg = &rp->r_rax;
14627c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_RAX;
14637c478bd9Sstevel@tonic-gate break;
14647c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_2:
14657c478bd9Sstevel@tonic-gate reg = &rp->r_rcx;
14667c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_RCX;
14677c478bd9Sstevel@tonic-gate break;
14687c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_1 | FASTTRAP_RIP_X:
14697c478bd9Sstevel@tonic-gate reg = &rp->r_r8;
14707c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_R8;
14717c478bd9Sstevel@tonic-gate break;
14727c478bd9Sstevel@tonic-gate case FASTTRAP_RIP_2 | FASTTRAP_RIP_X:
14737c478bd9Sstevel@tonic-gate reg = &rp->r_r9;
14747c478bd9Sstevel@tonic-gate curthread->t_dtrace_reg = REG_R9;
14757c478bd9Sstevel@tonic-gate break;
14767c478bd9Sstevel@tonic-gate }
14777c478bd9Sstevel@tonic-gate
147873427c57Sahl /* LINTED - alignment */
14797c478bd9Sstevel@tonic-gate *(uint64_t *)&scratch[i] = *reg;
14807c478bd9Sstevel@tonic-gate curthread->t_dtrace_regv = *reg;
14817c478bd9Sstevel@tonic-gate *reg = pc + tp->ftt_size;
14827c478bd9Sstevel@tonic-gate i += sizeof (uint64_t);
14837c478bd9Sstevel@tonic-gate }
14847c478bd9Sstevel@tonic-gate
14857c478bd9Sstevel@tonic-gate /*
14867c478bd9Sstevel@tonic-gate * Generate the branch instruction to what would have
14877c478bd9Sstevel@tonic-gate * normally been the subsequent instruction. In 32-bit mode,
14887c478bd9Sstevel@tonic-gate * this is just a relative branch; in 64-bit mode this is a
14897c478bd9Sstevel@tonic-gate * %rip-relative branch that loads the 64-bit pc value
14907c478bd9Sstevel@tonic-gate * immediately after the jmp instruction.
14917c478bd9Sstevel@tonic-gate */
14927c478bd9Sstevel@tonic-gate if (p->p_model == DATAMODEL_LP64) {
14937c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_GROUP5_OP;
14947c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_MODRM(0, 4, 5);
149573427c57Sahl /* LINTED - alignment */
14967c478bd9Sstevel@tonic-gate *(uint32_t *)&scratch[i] = 0;
14977c478bd9Sstevel@tonic-gate i += sizeof (uint32_t);
149873427c57Sahl /* LINTED - alignment */
14997c478bd9Sstevel@tonic-gate *(uint64_t *)&scratch[i] = pc + tp->ftt_size;
15007c478bd9Sstevel@tonic-gate i += sizeof (uint64_t);
15017c478bd9Sstevel@tonic-gate } else {
15027c478bd9Sstevel@tonic-gate /*
15037c478bd9Sstevel@tonic-gate * Set up the jmp to the next instruction; note that
15047c478bd9Sstevel@tonic-gate * the size of the traced instruction cancels out.
15057c478bd9Sstevel@tonic-gate */
15067c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_JMP32;
150773427c57Sahl /* LINTED - alignment */
15087c478bd9Sstevel@tonic-gate *(uint32_t *)&scratch[i] = pc - addr - 5;
15097c478bd9Sstevel@tonic-gate i += sizeof (uint32_t);
15107c478bd9Sstevel@tonic-gate }
15117c478bd9Sstevel@tonic-gate
15127c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = addr + i;
15137c478bd9Sstevel@tonic-gate bcopy(tp->ftt_instr, &scratch[i], tp->ftt_size);
15147c478bd9Sstevel@tonic-gate i += tp->ftt_size;
15157c478bd9Sstevel@tonic-gate scratch[i++] = FASTTRAP_INT;
15167c478bd9Sstevel@tonic-gate scratch[i++] = T_DTRACE_RET;
15177c478bd9Sstevel@tonic-gate
15186009dbc6Sahl ASSERT(i <= sizeof (scratch));
15196009dbc6Sahl
15207c478bd9Sstevel@tonic-gate if (fasttrap_copyout(scratch, (char *)addr, i)) {
15217c478bd9Sstevel@tonic-gate fasttrap_sigtrap(p, curthread, pc);
15227c478bd9Sstevel@tonic-gate new_pc = pc;
15237c478bd9Sstevel@tonic-gate break;
15247c478bd9Sstevel@tonic-gate }
15257c478bd9Sstevel@tonic-gate
15267c478bd9Sstevel@tonic-gate if (tp->ftt_retids != NULL) {
15277c478bd9Sstevel@tonic-gate curthread->t_dtrace_step = 1;
15287c478bd9Sstevel@tonic-gate curthread->t_dtrace_ret = 1;
15297c478bd9Sstevel@tonic-gate new_pc = curthread->t_dtrace_astpc;
15307c478bd9Sstevel@tonic-gate } else {
15317c478bd9Sstevel@tonic-gate new_pc = curthread->t_dtrace_scrpc;
15327c478bd9Sstevel@tonic-gate }
15337c478bd9Sstevel@tonic-gate
15347c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = pc;
15357c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = pc + tp->ftt_size;
15367c478bd9Sstevel@tonic-gate curthread->t_dtrace_on = 1;
15377c478bd9Sstevel@tonic-gate break;
15387c478bd9Sstevel@tonic-gate }
15397c478bd9Sstevel@tonic-gate
15407c478bd9Sstevel@tonic-gate default:
15417c478bd9Sstevel@tonic-gate panic("fasttrap: mishandled an instruction");
15427c478bd9Sstevel@tonic-gate }
15437c478bd9Sstevel@tonic-gate
1544ac448965Sahl done:
15457c478bd9Sstevel@tonic-gate /*
15467c478bd9Sstevel@tonic-gate * If there were no return probes when we first found the tracepoint,
15477c478bd9Sstevel@tonic-gate * we should feel no obligation to honor any return probes that were
15487c478bd9Sstevel@tonic-gate * subsequently enabled -- they'll just have to wait until the next
15497c478bd9Sstevel@tonic-gate * time around.
15507c478bd9Sstevel@tonic-gate */
15517c478bd9Sstevel@tonic-gate if (tp->ftt_retids != NULL) {
15527c478bd9Sstevel@tonic-gate /*
15537c478bd9Sstevel@tonic-gate * We need to wait until the results of the instruction are
15547c478bd9Sstevel@tonic-gate * apparent before invoking any return probes. If this
15557c478bd9Sstevel@tonic-gate * instruction was emulated we can just call
15567c478bd9Sstevel@tonic-gate * fasttrap_return_common(); if it needs to be executed, we
15577c478bd9Sstevel@tonic-gate * need to wait until the user thread returns to the kernel.
15587c478bd9Sstevel@tonic-gate */
15597c478bd9Sstevel@tonic-gate if (tp->ftt_type != FASTTRAP_T_COMMON) {
15607c478bd9Sstevel@tonic-gate /*
15617c478bd9Sstevel@tonic-gate * Set the program counter to the address of the traced
15627c478bd9Sstevel@tonic-gate * instruction so that it looks right in ustack()
15637c478bd9Sstevel@tonic-gate * output. We had previously set it to the end of the
15647c478bd9Sstevel@tonic-gate * instruction to simplify %rip-relative addressing.
15657c478bd9Sstevel@tonic-gate */
15667c478bd9Sstevel@tonic-gate rp->r_pc = pc;
15677c478bd9Sstevel@tonic-gate
15687c478bd9Sstevel@tonic-gate fasttrap_return_common(rp, pc, pid, new_pc);
15697c478bd9Sstevel@tonic-gate } else {
15707c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_ret != 0);
15717c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_pc == pc);
15727c478bd9Sstevel@tonic-gate ASSERT(curthread->t_dtrace_scrpc != 0);
15737c478bd9Sstevel@tonic-gate ASSERT(new_pc == curthread->t_dtrace_astpc);
15747c478bd9Sstevel@tonic-gate }
15757c478bd9Sstevel@tonic-gate }
15767c478bd9Sstevel@tonic-gate
15777c478bd9Sstevel@tonic-gate rp->r_pc = new_pc;
15787c478bd9Sstevel@tonic-gate
15797c478bd9Sstevel@tonic-gate return (0);
15807c478bd9Sstevel@tonic-gate }
15817c478bd9Sstevel@tonic-gate
15827c478bd9Sstevel@tonic-gate int
fasttrap_return_probe(struct regs * rp)15837c478bd9Sstevel@tonic-gate fasttrap_return_probe(struct regs *rp)
15847c478bd9Sstevel@tonic-gate {
15857c478bd9Sstevel@tonic-gate proc_t *p = curproc;
15867c478bd9Sstevel@tonic-gate uintptr_t pc = curthread->t_dtrace_pc;
15877c478bd9Sstevel@tonic-gate uintptr_t npc = curthread->t_dtrace_npc;
15887c478bd9Sstevel@tonic-gate
15897c478bd9Sstevel@tonic-gate curthread->t_dtrace_pc = 0;
15907c478bd9Sstevel@tonic-gate curthread->t_dtrace_npc = 0;
15917c478bd9Sstevel@tonic-gate curthread->t_dtrace_scrpc = 0;
15927c478bd9Sstevel@tonic-gate curthread->t_dtrace_astpc = 0;
15937c478bd9Sstevel@tonic-gate
15947c478bd9Sstevel@tonic-gate /*
15957c478bd9Sstevel@tonic-gate * Treat a child created by a call to vfork(2) as if it were its
15967c478bd9Sstevel@tonic-gate * parent. We know that there's only one thread of control in such a
15977c478bd9Sstevel@tonic-gate * process: this one.
15987c478bd9Sstevel@tonic-gate */
15997c478bd9Sstevel@tonic-gate while (p->p_flag & SVFORK) {
16007c478bd9Sstevel@tonic-gate p = p->p_parent;
16017c478bd9Sstevel@tonic-gate }
16027c478bd9Sstevel@tonic-gate
16037c478bd9Sstevel@tonic-gate /*
16047c478bd9Sstevel@tonic-gate * We set rp->r_pc to the address of the traced instruction so
16057c478bd9Sstevel@tonic-gate * that it appears to dtrace_probe() that we're on the original
16067c478bd9Sstevel@tonic-gate * instruction, and so that the user can't easily detect our
16077c478bd9Sstevel@tonic-gate * complex web of lies. dtrace_return_probe() (our caller)
16087c478bd9Sstevel@tonic-gate * will correctly set %pc after we return.
16097c478bd9Sstevel@tonic-gate */
16107c478bd9Sstevel@tonic-gate rp->r_pc = pc;
16117c478bd9Sstevel@tonic-gate
16127c478bd9Sstevel@tonic-gate fasttrap_return_common(rp, pc, p->p_pid, npc);
16137c478bd9Sstevel@tonic-gate
16147c478bd9Sstevel@tonic-gate return (0);
16157c478bd9Sstevel@tonic-gate }
16167c478bd9Sstevel@tonic-gate
16177c478bd9Sstevel@tonic-gate /*ARGSUSED*/
16187c478bd9Sstevel@tonic-gate uint64_t
fasttrap_pid_getarg(void * arg,dtrace_id_t id,void * parg,int argno,int aframes)1619f498645aSahl fasttrap_pid_getarg(void *arg, dtrace_id_t id, void *parg, int argno,
1620f498645aSahl int aframes)
16217c478bd9Sstevel@tonic-gate {
16227c478bd9Sstevel@tonic-gate return (fasttrap_anarg(ttolwp(curthread)->lwp_regs, 1, argno));
16237c478bd9Sstevel@tonic-gate }
16247c478bd9Sstevel@tonic-gate
16257c478bd9Sstevel@tonic-gate /*ARGSUSED*/
16267c478bd9Sstevel@tonic-gate uint64_t
fasttrap_usdt_getarg(void * arg,dtrace_id_t id,void * parg,int argno,int aframes)16277c478bd9Sstevel@tonic-gate fasttrap_usdt_getarg(void *arg, dtrace_id_t id, void *parg, int argno,
16287c478bd9Sstevel@tonic-gate int aframes)
16297c478bd9Sstevel@tonic-gate {
16307c478bd9Sstevel@tonic-gate return (fasttrap_anarg(ttolwp(curthread)->lwp_regs, 0, argno));
16317c478bd9Sstevel@tonic-gate }
16327c478bd9Sstevel@tonic-gate
16337c478bd9Sstevel@tonic-gate static ulong_t
fasttrap_getreg(struct regs * rp,uint_t reg)16347c478bd9Sstevel@tonic-gate fasttrap_getreg(struct regs *rp, uint_t reg)
16357c478bd9Sstevel@tonic-gate {
16367c478bd9Sstevel@tonic-gate switch (reg) {
16377c478bd9Sstevel@tonic-gate case REG_R15: return (rp->r_r15);
16387c478bd9Sstevel@tonic-gate case REG_R14: return (rp->r_r14);
16397c478bd9Sstevel@tonic-gate case REG_R13: return (rp->r_r13);
16407c478bd9Sstevel@tonic-gate case REG_R12: return (rp->r_r12);
16417c478bd9Sstevel@tonic-gate case REG_R11: return (rp->r_r11);
16427c478bd9Sstevel@tonic-gate case REG_R10: return (rp->r_r10);
16437c478bd9Sstevel@tonic-gate case REG_R9: return (rp->r_r9);
16447c478bd9Sstevel@tonic-gate case REG_R8: return (rp->r_r8);
16457c478bd9Sstevel@tonic-gate case REG_RDI: return (rp->r_rdi);
16467c478bd9Sstevel@tonic-gate case REG_RSI: return (rp->r_rsi);
16477c478bd9Sstevel@tonic-gate case REG_RBP: return (rp->r_rbp);
16487c478bd9Sstevel@tonic-gate case REG_RBX: return (rp->r_rbx);
16497c478bd9Sstevel@tonic-gate case REG_RDX: return (rp->r_rdx);
16507c478bd9Sstevel@tonic-gate case REG_RCX: return (rp->r_rcx);
16517c478bd9Sstevel@tonic-gate case REG_RAX: return (rp->r_rax);
16527c478bd9Sstevel@tonic-gate case REG_TRAPNO: return (rp->r_trapno);
16537c478bd9Sstevel@tonic-gate case REG_ERR: return (rp->r_err);
16547c478bd9Sstevel@tonic-gate case REG_RIP: return (rp->r_rip);
16557c478bd9Sstevel@tonic-gate case REG_CS: return (rp->r_cs);
16567c478bd9Sstevel@tonic-gate case REG_RFL: return (rp->r_rfl);
16577c478bd9Sstevel@tonic-gate case REG_RSP: return (rp->r_rsp);
16587c478bd9Sstevel@tonic-gate case REG_SS: return (rp->r_ss);
16597c478bd9Sstevel@tonic-gate case REG_FS: return (rp->r_fs);
16607c478bd9Sstevel@tonic-gate case REG_GS: return (rp->r_gs);
16617c478bd9Sstevel@tonic-gate case REG_DS: return (rp->r_ds);
16627c478bd9Sstevel@tonic-gate case REG_ES: return (rp->r_es);
1663ae115bc7Smrj case REG_FSBASE: return (rdmsr(MSR_AMD_FSBASE));
1664ae115bc7Smrj case REG_GSBASE: return (rdmsr(MSR_AMD_GSBASE));
16657c478bd9Sstevel@tonic-gate }
16667c478bd9Sstevel@tonic-gate
16677c478bd9Sstevel@tonic-gate panic("dtrace: illegal register constant");
16687c478bd9Sstevel@tonic-gate /*NOTREACHED*/
16697c478bd9Sstevel@tonic-gate }
1670