1237fae79SAdrian Hunter /* 2237fae79SAdrian Hunter * intel_pt_insn_decoder.c: Intel Processor Trace support 3237fae79SAdrian Hunter * Copyright (c) 2013-2014, Intel Corporation. 4237fae79SAdrian Hunter * 5237fae79SAdrian Hunter * This program is free software; you can redistribute it and/or modify it 6237fae79SAdrian Hunter * under the terms and conditions of the GNU General Public License, 7237fae79SAdrian Hunter * version 2, as published by the Free Software Foundation. 8237fae79SAdrian Hunter * 9237fae79SAdrian Hunter * This program is distributed in the hope it will be useful, but WITHOUT 10237fae79SAdrian Hunter * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11237fae79SAdrian Hunter * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12237fae79SAdrian Hunter * more details. 13237fae79SAdrian Hunter * 14237fae79SAdrian Hunter */ 15237fae79SAdrian Hunter 16237fae79SAdrian Hunter #include <stdio.h> 17237fae79SAdrian Hunter #include <string.h> 18237fae79SAdrian Hunter #include <endian.h> 19237fae79SAdrian Hunter #include <byteswap.h> 20237fae79SAdrian Hunter 21237fae79SAdrian Hunter #include "event.h" 22237fae79SAdrian Hunter 235839a550SAdrian Hunter #include "insn.h" 24237fae79SAdrian Hunter 25237fae79SAdrian Hunter #include "inat.c" 26237fae79SAdrian Hunter #include "insn.c" 27237fae79SAdrian Hunter 28237fae79SAdrian Hunter #include "intel-pt-insn-decoder.h" 29237fae79SAdrian Hunter 30faaa8768SAndi Kleen #if INTEL_PT_INSN_BUF_SZ < MAX_INSN_SIZE || INTEL_PT_INSN_BUF_SZ > MAX_INSN 3132f98aabSAdrian Hunter #error Instruction buffer size too small 3232f98aabSAdrian Hunter #endif 3332f98aabSAdrian Hunter 34237fae79SAdrian Hunter /* Based on branch_type() from perf_event_intel_lbr.c */ 35237fae79SAdrian Hunter static void intel_pt_insn_decoder(struct insn *insn, 36237fae79SAdrian Hunter struct intel_pt_insn *intel_pt_insn) 37237fae79SAdrian Hunter { 38237fae79SAdrian Hunter enum intel_pt_insn_op op = INTEL_PT_OP_OTHER; 39237fae79SAdrian Hunter enum intel_pt_insn_branch branch = INTEL_PT_BR_NO_BRANCH; 40237fae79SAdrian Hunter int ext; 41237fae79SAdrian Hunter 42f1c4d1adSAdrian Hunter intel_pt_insn->rel = 0; 43f1c4d1adSAdrian Hunter 44237fae79SAdrian Hunter if (insn_is_avx(insn)) { 45237fae79SAdrian Hunter intel_pt_insn->op = INTEL_PT_OP_OTHER; 46237fae79SAdrian Hunter intel_pt_insn->branch = INTEL_PT_BR_NO_BRANCH; 47237fae79SAdrian Hunter intel_pt_insn->length = insn->length; 48237fae79SAdrian Hunter return; 49237fae79SAdrian Hunter } 50237fae79SAdrian Hunter 51237fae79SAdrian Hunter switch (insn->opcode.bytes[0]) { 52237fae79SAdrian Hunter case 0xf: 53237fae79SAdrian Hunter switch (insn->opcode.bytes[1]) { 54237fae79SAdrian Hunter case 0x05: /* syscall */ 55237fae79SAdrian Hunter case 0x34: /* sysenter */ 56237fae79SAdrian Hunter op = INTEL_PT_OP_SYSCALL; 57237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 58237fae79SAdrian Hunter break; 59237fae79SAdrian Hunter case 0x07: /* sysret */ 60237fae79SAdrian Hunter case 0x35: /* sysexit */ 61237fae79SAdrian Hunter op = INTEL_PT_OP_SYSRET; 62237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 63237fae79SAdrian Hunter break; 64237fae79SAdrian Hunter case 0x80 ... 0x8f: /* jcc */ 65237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 66237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 67237fae79SAdrian Hunter break; 68237fae79SAdrian Hunter default: 69237fae79SAdrian Hunter break; 70237fae79SAdrian Hunter } 71237fae79SAdrian Hunter break; 72237fae79SAdrian Hunter case 0x70 ... 0x7f: /* jcc */ 73237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 74237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 75237fae79SAdrian Hunter break; 76237fae79SAdrian Hunter case 0xc2: /* near ret */ 77237fae79SAdrian Hunter case 0xc3: /* near ret */ 78237fae79SAdrian Hunter case 0xca: /* far ret */ 79237fae79SAdrian Hunter case 0xcb: /* far ret */ 80237fae79SAdrian Hunter op = INTEL_PT_OP_RET; 81237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 82237fae79SAdrian Hunter break; 83237fae79SAdrian Hunter case 0xcf: /* iret */ 84237fae79SAdrian Hunter op = INTEL_PT_OP_IRET; 85237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 86237fae79SAdrian Hunter break; 87237fae79SAdrian Hunter case 0xcc ... 0xce: /* int */ 88237fae79SAdrian Hunter op = INTEL_PT_OP_INT; 89237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 90237fae79SAdrian Hunter break; 91237fae79SAdrian Hunter case 0xe8: /* call near rel */ 92237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 93237fae79SAdrian Hunter branch = INTEL_PT_BR_UNCONDITIONAL; 94237fae79SAdrian Hunter break; 95237fae79SAdrian Hunter case 0x9a: /* call far absolute */ 96237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 97237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 98237fae79SAdrian Hunter break; 99237fae79SAdrian Hunter case 0xe0 ... 0xe2: /* loop */ 100237fae79SAdrian Hunter op = INTEL_PT_OP_LOOP; 101237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 102237fae79SAdrian Hunter break; 103237fae79SAdrian Hunter case 0xe3: /* jcc */ 104237fae79SAdrian Hunter op = INTEL_PT_OP_JCC; 105237fae79SAdrian Hunter branch = INTEL_PT_BR_CONDITIONAL; 106237fae79SAdrian Hunter break; 107237fae79SAdrian Hunter case 0xe9: /* jmp */ 108237fae79SAdrian Hunter case 0xeb: /* jmp */ 109237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 110237fae79SAdrian Hunter branch = INTEL_PT_BR_UNCONDITIONAL; 111237fae79SAdrian Hunter break; 112237fae79SAdrian Hunter case 0xea: /* far jmp */ 113237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 114237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 115237fae79SAdrian Hunter break; 116237fae79SAdrian Hunter case 0xff: /* call near absolute, call far absolute ind */ 117237fae79SAdrian Hunter ext = (insn->modrm.bytes[0] >> 3) & 0x7; 118237fae79SAdrian Hunter switch (ext) { 119237fae79SAdrian Hunter case 2: /* near ind call */ 120237fae79SAdrian Hunter case 3: /* far ind call */ 121237fae79SAdrian Hunter op = INTEL_PT_OP_CALL; 122237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 123237fae79SAdrian Hunter break; 124237fae79SAdrian Hunter case 4: 125237fae79SAdrian Hunter case 5: 126237fae79SAdrian Hunter op = INTEL_PT_OP_JMP; 127237fae79SAdrian Hunter branch = INTEL_PT_BR_INDIRECT; 128237fae79SAdrian Hunter break; 129237fae79SAdrian Hunter default: 130237fae79SAdrian Hunter break; 131237fae79SAdrian Hunter } 132237fae79SAdrian Hunter break; 133237fae79SAdrian Hunter default: 134237fae79SAdrian Hunter break; 135237fae79SAdrian Hunter } 136237fae79SAdrian Hunter 137237fae79SAdrian Hunter intel_pt_insn->op = op; 138237fae79SAdrian Hunter intel_pt_insn->branch = branch; 139237fae79SAdrian Hunter intel_pt_insn->length = insn->length; 140237fae79SAdrian Hunter 141237fae79SAdrian Hunter if (branch == INTEL_PT_BR_CONDITIONAL || 142237fae79SAdrian Hunter branch == INTEL_PT_BR_UNCONDITIONAL) { 143237fae79SAdrian Hunter #if __BYTE_ORDER == __BIG_ENDIAN 144237fae79SAdrian Hunter switch (insn->immediate.nbytes) { 145237fae79SAdrian Hunter case 1: 146237fae79SAdrian Hunter intel_pt_insn->rel = insn->immediate.value; 147237fae79SAdrian Hunter break; 148237fae79SAdrian Hunter case 2: 149237fae79SAdrian Hunter intel_pt_insn->rel = 150237fae79SAdrian Hunter bswap_16((short)insn->immediate.value); 151237fae79SAdrian Hunter break; 152237fae79SAdrian Hunter case 4: 153237fae79SAdrian Hunter intel_pt_insn->rel = bswap_32(insn->immediate.value); 154237fae79SAdrian Hunter break; 15597db6206SAdrian Hunter default: 15697db6206SAdrian Hunter intel_pt_insn->rel = 0; 15797db6206SAdrian Hunter break; 158237fae79SAdrian Hunter } 159237fae79SAdrian Hunter #else 160237fae79SAdrian Hunter intel_pt_insn->rel = insn->immediate.value; 161237fae79SAdrian Hunter #endif 162237fae79SAdrian Hunter } 163237fae79SAdrian Hunter } 164237fae79SAdrian Hunter 165237fae79SAdrian Hunter int intel_pt_get_insn(const unsigned char *buf, size_t len, int x86_64, 166237fae79SAdrian Hunter struct intel_pt_insn *intel_pt_insn) 167237fae79SAdrian Hunter { 168237fae79SAdrian Hunter struct insn insn; 169237fae79SAdrian Hunter 170237fae79SAdrian Hunter insn_init(&insn, buf, len, x86_64); 171237fae79SAdrian Hunter insn_get_length(&insn); 172237fae79SAdrian Hunter if (!insn_complete(&insn) || insn.length > len) 173237fae79SAdrian Hunter return -1; 174237fae79SAdrian Hunter intel_pt_insn_decoder(&insn, intel_pt_insn); 17532f98aabSAdrian Hunter if (insn.length < INTEL_PT_INSN_BUF_SZ) 176237fae79SAdrian Hunter memcpy(intel_pt_insn->buf, buf, insn.length); 177237fae79SAdrian Hunter else 17832f98aabSAdrian Hunter memcpy(intel_pt_insn->buf, buf, INTEL_PT_INSN_BUF_SZ); 179237fae79SAdrian Hunter return 0; 180237fae79SAdrian Hunter } 181237fae79SAdrian Hunter 182237fae79SAdrian Hunter const char *branch_name[] = { 183237fae79SAdrian Hunter [INTEL_PT_OP_OTHER] = "Other", 184237fae79SAdrian Hunter [INTEL_PT_OP_CALL] = "Call", 185237fae79SAdrian Hunter [INTEL_PT_OP_RET] = "Ret", 186237fae79SAdrian Hunter [INTEL_PT_OP_JCC] = "Jcc", 187237fae79SAdrian Hunter [INTEL_PT_OP_JMP] = "Jmp", 188237fae79SAdrian Hunter [INTEL_PT_OP_LOOP] = "Loop", 189237fae79SAdrian Hunter [INTEL_PT_OP_IRET] = "IRet", 190237fae79SAdrian Hunter [INTEL_PT_OP_INT] = "Int", 191237fae79SAdrian Hunter [INTEL_PT_OP_SYSCALL] = "Syscall", 192237fae79SAdrian Hunter [INTEL_PT_OP_SYSRET] = "Sysret", 193237fae79SAdrian Hunter }; 194237fae79SAdrian Hunter 195237fae79SAdrian Hunter const char *intel_pt_insn_name(enum intel_pt_insn_op op) 196237fae79SAdrian Hunter { 197237fae79SAdrian Hunter return branch_name[op]; 198237fae79SAdrian Hunter } 199237fae79SAdrian Hunter 200237fae79SAdrian Hunter int intel_pt_insn_desc(const struct intel_pt_insn *intel_pt_insn, char *buf, 201237fae79SAdrian Hunter size_t buf_len) 202237fae79SAdrian Hunter { 203237fae79SAdrian Hunter switch (intel_pt_insn->branch) { 204237fae79SAdrian Hunter case INTEL_PT_BR_CONDITIONAL: 205237fae79SAdrian Hunter case INTEL_PT_BR_UNCONDITIONAL: 206237fae79SAdrian Hunter return snprintf(buf, buf_len, "%s %s%d", 207237fae79SAdrian Hunter intel_pt_insn_name(intel_pt_insn->op), 208237fae79SAdrian Hunter intel_pt_insn->rel > 0 ? "+" : "", 209237fae79SAdrian Hunter intel_pt_insn->rel); 210237fae79SAdrian Hunter case INTEL_PT_BR_NO_BRANCH: 211237fae79SAdrian Hunter case INTEL_PT_BR_INDIRECT: 212237fae79SAdrian Hunter return snprintf(buf, buf_len, "%s", 213237fae79SAdrian Hunter intel_pt_insn_name(intel_pt_insn->op)); 214237fae79SAdrian Hunter default: 215237fae79SAdrian Hunter break; 216237fae79SAdrian Hunter } 217237fae79SAdrian Hunter return 0; 218237fae79SAdrian Hunter } 219237fae79SAdrian Hunter 220237fae79SAdrian Hunter int intel_pt_insn_type(enum intel_pt_insn_op op) 221237fae79SAdrian Hunter { 222237fae79SAdrian Hunter switch (op) { 223237fae79SAdrian Hunter case INTEL_PT_OP_OTHER: 224237fae79SAdrian Hunter return 0; 225237fae79SAdrian Hunter case INTEL_PT_OP_CALL: 226237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL; 227237fae79SAdrian Hunter case INTEL_PT_OP_RET: 228237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN; 229237fae79SAdrian Hunter case INTEL_PT_OP_JCC: 230237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL; 231237fae79SAdrian Hunter case INTEL_PT_OP_JMP: 232237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH; 233237fae79SAdrian Hunter case INTEL_PT_OP_LOOP: 234237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CONDITIONAL; 235237fae79SAdrian Hunter case INTEL_PT_OP_IRET: 236237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | 237237fae79SAdrian Hunter PERF_IP_FLAG_INTERRUPT; 238237fae79SAdrian Hunter case INTEL_PT_OP_INT: 239237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | 240237fae79SAdrian Hunter PERF_IP_FLAG_INTERRUPT; 241237fae79SAdrian Hunter case INTEL_PT_OP_SYSCALL: 242237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL | 243237fae79SAdrian Hunter PERF_IP_FLAG_SYSCALLRET; 244237fae79SAdrian Hunter case INTEL_PT_OP_SYSRET: 245237fae79SAdrian Hunter return PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_RETURN | 246237fae79SAdrian Hunter PERF_IP_FLAG_SYSCALLRET; 247237fae79SAdrian Hunter default: 248237fae79SAdrian Hunter return 0; 249237fae79SAdrian Hunter } 250237fae79SAdrian Hunter } 251