12025cf9eSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2237fae79SAdrian Hunter /* 3237fae79SAdrian Hunter * intel_pt_insn_decoder.c: Intel Processor Trace support 4237fae79SAdrian Hunter * Copyright (c) 2013-2014, Intel Corporation. 5237fae79SAdrian Hunter */ 6237fae79SAdrian Hunter 700a26390SJosh Poimboeuf #include <linux/kernel.h> 8237fae79SAdrian Hunter #include <stdio.h> 9237fae79SAdrian Hunter #include <string.h> 10237fae79SAdrian Hunter #include <endian.h> 11237fae79SAdrian Hunter #include <byteswap.h> 1200a26390SJosh Poimboeuf #include "../../../arch/x86/include/asm/insn.h" 1300a26390SJosh Poimboeuf 1400a26390SJosh Poimboeuf #include "../../../arch/x86/lib/inat.c" 1500a26390SJosh Poimboeuf #include "../../../arch/x86/lib/insn.c" 16237fae79SAdrian Hunter 17237fae79SAdrian Hunter #include "event.h" 18237fae79SAdrian Hunter 19237fae79SAdrian Hunter #include "intel-pt-insn-decoder.h" 2048d02a1dSAndi Kleen #include "dump-insn.h" 21237fae79SAdrian Hunter 22faaa8768SAndi Kleen #if INTEL_PT_INSN_BUF_SZ < MAX_INSN_SIZE || INTEL_PT_INSN_BUF_SZ > MAX_INSN 2332f98aabSAdrian Hunter #error Instruction buffer size too small 2432f98aabSAdrian Hunter #endif 2532f98aabSAdrian Hunter 26940b2f2fSBorislav Petkov /* Based on branch_type() from arch/x86/events/intel/lbr.c */ 27237fae79SAdrian Hunter static void intel_pt_insn_decoder(struct insn *insn, 28237fae79SAdrian Hunter struct intel_pt_insn *intel_pt_insn) 29237fae79SAdrian Hunter { 30237fae79SAdrian Hunter enum intel_pt_insn_op op = INTEL_PT_OP_OTHER; 31237fae79SAdrian Hunter enum intel_pt_insn_branch branch = INTEL_PT_BR_NO_BRANCH; 32237fae79SAdrian Hunter int ext; 33237fae79SAdrian Hunter 34f1c4d1adSAdrian Hunter intel_pt_insn->rel = 0; 35f1c4d1adSAdrian Hunter 36237fae79SAdrian Hunter if (insn_is_avx(insn)) { 37237fae79SAdrian Hunter intel_pt_insn->op = INTEL_PT_OP_OTHER; 38237fae79SAdrian Hunter intel_pt_insn->branch = INTEL_PT_BR_NO_BRANCH; 39237fae79SAdrian Hunter intel_pt_insn->length = insn->length; 40237fae79SAdrian Hunter return; 41237fae79SAdrian Hunter } 42237fae79SAdrian Hunter 43237fae79SAdrian Hunter switch (insn->opcode.bytes[0]) { 44237fae79SAdrian Hunter case 0xf: 45237fae79SAdrian Hunter switch (insn->opcode.bytes[1]) { 46237fae79SAdrian Hunter case 0x05: /* syscall */ 47237fae79SAdrian Hunter case 0x34: /* sysenter */ 48237fae79SAdrian Hunter op = INTEL_PT_OP_SYSCALL; 49237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 50237fae79SAdrian Hunter break; 51237fae79SAdrian Hunter case 0x07: /* sysret */ 52237fae79SAdrian Hunter case 0x35: /* sysexit */ 53237fae79SAdrian Hunter op = INTEL_PT_OP_SYSRET; 54237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 55237fae79SAdrian Hunter break; 56237fae79SAdrian Hunter case 0x80 ... 0x8f: /* jcc */ 57237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 58237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 59237fae79SAdrian Hunter break; 60237fae79SAdrian Hunter default: 61237fae79SAdrian Hunter break; 62237fae79SAdrian Hunter } 63237fae79SAdrian Hunter break; 64237fae79SAdrian Hunter case 0x70 ... 0x7f: /* jcc */ 65237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 66237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 67237fae79SAdrian Hunter break; 68237fae79SAdrian Hunter case 0xc2: /* near ret */ 69237fae79SAdrian Hunter case 0xc3: /* near ret */ 70237fae79SAdrian Hunter case 0xca: /* far ret */ 71237fae79SAdrian Hunter case 0xcb: /* far ret */ 72237fae79SAdrian Hunter op = INTEL_PT_OP_RET; 73237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 74237fae79SAdrian Hunter break; 75237fae79SAdrian Hunter case 0xcf: /* iret */ 76237fae79SAdrian Hunter op = INTEL_PT_OP_IRET; 77237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 78237fae79SAdrian Hunter break; 79237fae79SAdrian Hunter case 0xcc ... 0xce: /* int */ 80237fae79SAdrian Hunter op = INTEL_PT_OP_INT; 81237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 82237fae79SAdrian Hunter break; 83237fae79SAdrian Hunter case 0xe8: /* call near rel */ 84237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 85237fae79SAdrian Hunter branch = INTEL_PT_BR_UNCONDITIONAL; 86237fae79SAdrian Hunter break; 87237fae79SAdrian Hunter case 0x9a: /* call far absolute */ 88237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 89237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 90237fae79SAdrian Hunter break; 91237fae79SAdrian Hunter case 0xe0 ... 0xe2: /* loop */ 92237fae79SAdrian Hunter op = INTEL_PT_OP_LOOP; 93237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 94237fae79SAdrian Hunter break; 95237fae79SAdrian Hunter case 0xe3: /* jcc */ 96237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 97237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 98237fae79SAdrian Hunter break; 99237fae79SAdrian Hunter case 0xe9: /* jmp */ 100237fae79SAdrian Hunter case 0xeb: /* jmp */ 101237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 102237fae79SAdrian Hunter branch = INTEL_PT_BR_UNCONDITIONAL; 103237fae79SAdrian Hunter break; 104237fae79SAdrian Hunter case 0xea: /* far jmp */ 105237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 106237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 107237fae79SAdrian Hunter break; 108237fae79SAdrian Hunter case 0xff: /* call near absolute, call far absolute ind */ 109237fae79SAdrian Hunter ext = (insn->modrm.bytes[0] >> 3) & 0x7; 110237fae79SAdrian Hunter switch (ext) { 111237fae79SAdrian Hunter case 2: /* near ind call */ 112237fae79SAdrian Hunter case 3: /* far ind call */ 113237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 114237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 115237fae79SAdrian Hunter break; 116237fae79SAdrian Hunter case 4: 117237fae79SAdrian Hunter case 5: 118237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 119237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 120237fae79SAdrian Hunter break; 121237fae79SAdrian Hunter default: 122237fae79SAdrian Hunter break; 123237fae79SAdrian Hunter } 124237fae79SAdrian Hunter break; 125237fae79SAdrian Hunter default: 126237fae79SAdrian Hunter break; 127237fae79SAdrian Hunter } 128237fae79SAdrian Hunter 129237fae79SAdrian Hunter intel_pt_insn->op = op; 130237fae79SAdrian Hunter intel_pt_insn->branch = branch; 131237fae79SAdrian Hunter intel_pt_insn->length = insn->length; 132237fae79SAdrian Hunter 133237fae79SAdrian Hunter if (branch == INTEL_PT_BR_CONDITIONAL || 134237fae79SAdrian Hunter branch == INTEL_PT_BR_UNCONDITIONAL) { 135237fae79SAdrian Hunter #if __BYTE_ORDER == __BIG_ENDIAN 136237fae79SAdrian Hunter switch (insn->immediate.nbytes) { 137237fae79SAdrian Hunter case 1: 138237fae79SAdrian Hunter intel_pt_insn->rel = insn->immediate.value; 139237fae79SAdrian Hunter break; 140237fae79SAdrian Hunter case 2: 141237fae79SAdrian Hunter intel_pt_insn->rel = 142237fae79SAdrian Hunter bswap_16((short)insn->immediate.value); 143237fae79SAdrian Hunter break; 144237fae79SAdrian Hunter case 4: 145237fae79SAdrian Hunter intel_pt_insn->rel = bswap_32(insn->immediate.value); 146237fae79SAdrian Hunter break; 14797db6206SAdrian Hunter default: 14897db6206SAdrian Hunter intel_pt_insn->rel = 0; 14997db6206SAdrian Hunter break; 150237fae79SAdrian Hunter } 151237fae79SAdrian Hunter #else 152237fae79SAdrian Hunter intel_pt_insn->rel = insn->immediate.value; 153237fae79SAdrian Hunter #endif 154237fae79SAdrian Hunter } 155237fae79SAdrian Hunter } 156237fae79SAdrian Hunter 157237fae79SAdrian Hunter int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64, 158237fae79SAdrian Hunter struct intel_pt_insn *intel_pt_insn) 159237fae79SAdrian Hunter { 160237fae79SAdrian Hunter struct insn insn; 161237fae79SAdrian Hunter 162237fae79SAdrian Hunter insn_init(&insn, buf, len, x86_64); 163237fae79SAdrian Hunter insn_get_length(&insn); 164237fae79SAdrian Hunter if (!insn_complete(&insn) || insn.length > len) 165237fae79SAdrian Hunter return -1; 166237fae79SAdrian Hunter intel_pt_insn_decoder(&insn, intel_pt_insn); 16732f98aabSAdrian Hunter if (insn.length < INTEL_PT_INSN_BUF_SZ) 168237fae79SAdrian Hunter memcpy(intel_pt_insn->buf, buf, insn.length); 169237fae79SAdrian Hunter else 17032f98aabSAdrian Hunter memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_BUF_SZ); 171237fae79SAdrian Hunter return 0; 172237fae79SAdrian Hunter } 173237fae79SAdrian Hunter 17461f61159SAndi Kleen int arch_is_branch(const unsigned char *buf, size_t len, int x86_64) 17561f61159SAndi Kleen { 17661f61159SAndi Kleen struct intel_pt_insn in; 17761f61159SAndi Kleen if (intel_pt_get_insn(buf, len, x86_64, &in) < 0) 17861f61159SAndi Kleen return -1; 17961f61159SAndi Kleen return in.branch != INTEL_PT_BR_NO_BRANCH; 18061f61159SAndi Kleen } 18161f61159SAndi Kleen 18248d02a1dSAndi Kleen const char *dump_insn(struct perf_insn *x, uint64_t ip __maybe_unused, 18348d02a1dSAndi Kleen u8 *inbuf, int inlen, int *lenp) 18448d02a1dSAndi Kleen { 18548d02a1dSAndi Kleen struct insn insn; 18648d02a1dSAndi Kleen int n, i; 18748d02a1dSAndi Kleen int left; 18848d02a1dSAndi Kleen 18948d02a1dSAndi Kleen insn_init(&insn, inbuf, inlen, x->is64bit); 19048d02a1dSAndi Kleen insn_get_length(&insn); 19148d02a1dSAndi Kleen if (!insn_complete(&insn) || insn.length > inlen) 19248d02a1dSAndi Kleen return "<bad>"; 19348d02a1dSAndi Kleen if (lenp) 19448d02a1dSAndi Kleen *lenp = insn.length; 19548d02a1dSAndi Kleen left = sizeof(x->out); 19648d02a1dSAndi Kleen n = snprintf(x->out, left, "insn: "); 19748d02a1dSAndi Kleen left -= n; 19848d02a1dSAndi Kleen for (i = 0; i < insn.length; i++) { 19948d02a1dSAndi Kleen n += snprintf(x->out + n, left, "%02x ", inbuf[i]); 20048d02a1dSAndi Kleen left -= n; 20148d02a1dSAndi Kleen } 20248d02a1dSAndi Kleen return x->out; 20348d02a1dSAndi Kleen } 20448d02a1dSAndi Kleen 205237fae79SAdrian Hunter const char *branch_name[] = { 206237fae79SAdrian Hunter [INTEL_PT_OP_OTHER] = "Other", 207237fae79SAdrian Hunter [INTEL_PT_OP_CALL] = "Call", 208237fae79SAdrian Hunter [INTEL_PT_OP_RET] = "Ret", 209237fae79SAdrian Hunter [INTEL_PT_OP_JCC] = "Jcc", 210237fae79SAdrian Hunter [INTEL_PT_OP_JMP] = "Jmp", 211237fae79SAdrian Hunter [INTEL_PT_OP_LOOP] = "Loop", 212237fae79SAdrian Hunter [INTEL_PT_OP_IRET] = "IRet", 213237fae79SAdrian Hunter [INTEL_PT_OP_INT] = "Int", 214237fae79SAdrian Hunter [INTEL_PT_OP_SYSCALL] = "Syscall", 215237fae79SAdrian Hunter [INTEL_PT_OP_SYSRET] = "Sysret", 216237fae79SAdrian Hunter }; 217237fae79SAdrian Hunter 218237fae79SAdrian Hunter const char *intel_pt_insn_name(enum intel_pt_insn_op op) 219237fae79SAdrian Hunter { 220237fae79SAdrian Hunter return branch_name[op]; 221237fae79SAdrian Hunter } 222237fae79SAdrian Hunter 223237fae79SAdrian Hunter int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf, 224237fae79SAdrian Hunter size_t buf_len) 225237fae79SAdrian Hunter { 226237fae79SAdrian Hunter switch (intel_pt_insn->branch) { 227237fae79SAdrian Hunter case INTEL_PT_BR_CONDITIONAL: 228237fae79SAdrian Hunter case INTEL_PT_BR_UNCONDITIONAL: 229237fae79SAdrian Hunter return snprintf(buf, buf_len, "%s %s%d", 230237fae79SAdrian Hunter intel_pt_insn_name(intel_pt_insn->op), 231237fae79SAdrian Hunter intel_pt_insn->rel > 0 ? "+" : "", 232237fae79SAdrian Hunter intel_pt_insn->rel); 233237fae79SAdrian Hunter case INTEL_PT_BR_NO_BRANCH: 234237fae79SAdrian Hunter case INTEL_PT_BR_INDIRECT: 235237fae79SAdrian Hunter return snprintf(buf, buf_len, "%s", 236237fae79SAdrian Hunter intel_pt_insn_name(intel_pt_insn->op)); 237237fae79SAdrian Hunter default: 238237fae79SAdrian Hunter break; 239237fae79SAdrian Hunter } 240237fae79SAdrian Hunter return 0; 241237fae79SAdrian Hunter } 242237fae79SAdrian Hunter 243237fae79SAdrian Hunter int intel_pt_insn_type(enum intel_pt_insn_op op) 244237fae79SAdrian Hunter { 245237fae79SAdrian Hunter switch (op) { 246237fae79SAdrian Hunter case INTEL_PT_OP_OTHER: 247237fae79SAdrian Hunter return 0; 248237fae79SAdrian Hunter case INTEL_PT_OP_CALL: 249237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL; 250237fae79SAdrian Hunter case INTEL_PT_OP_RET: 251237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN; 252237fae79SAdrian Hunter case INTEL_PT_OP_JCC: 253237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL; 254237fae79SAdrian Hunter case INTEL_PT_OP_JMP: 255237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH; 256237fae79SAdrian Hunter case INTEL_PT_OP_LOOP: 257237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL; 258237fae79SAdrian Hunter case INTEL_PT_OP_IRET: 259237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | 260237fae79SAdrian Hunter PERF_IP_FLAG_INTERRUPT; 261237fae79SAdrian Hunter case INTEL_PT_OP_INT: 262237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | 263237fae79SAdrian Hunter PERF_IP_FLAG_INTERRUPT; 264237fae79SAdrian Hunter case INTEL_PT_OP_SYSCALL: 265237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | 266237fae79SAdrian Hunter PERF_IP_FLAG_SYSCALLRET; 267237fae79SAdrian Hunter case INTEL_PT_OP_SYSRET: 268237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | 269237fae79SAdrian Hunter PERF_IP_FLAG_SYSCALLRET; 270237fae79SAdrian Hunter default: 271237fae79SAdrian Hunter return 0; 272237fae79SAdrian Hunter } 273237fae79SAdrian Hunter } 274