mirror of https://github.com/torvalds/linux.git
136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Instruction binary disassembler based on capstone.
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*
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* Author(s): Changbin Du <changbin.du@huawei.com>
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*/
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#include <string.h>
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#include <stdbool.h>
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#include "debug.h"
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#include "sample.h"
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#include "symbol.h"
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#include "machine.h"
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#include "thread.h"
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#include "print_insn.h"
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size_t sample__fprintf_insn_raw(struct perf_sample *sample, FILE *fp)
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{
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int printed = 0;
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for (int i = 0; i < sample->insn_len; i++) {
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printed += fprintf(fp, "%02x", (unsigned char)sample->insn[i]);
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if (sample->insn_len - i > 1)
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printed += fprintf(fp, " ");
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}
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return printed;
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}
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#ifdef HAVE_LIBCAPSTONE_SUPPORT
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#include <capstone/capstone.h>
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static int capstone_init(struct machine *machine, csh *cs_handle)
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{
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cs_arch arch;
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cs_mode mode;
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if (machine__is(machine, "x86_64")) {
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arch = CS_ARCH_X86;
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mode = CS_MODE_64;
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} else if (machine__normalized_is(machine, "x86")) {
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arch = CS_ARCH_X86;
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mode = CS_MODE_32;
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} else if (machine__normalized_is(machine, "arm64")) {
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arch = CS_ARCH_ARM64;
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mode = CS_MODE_ARM;
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} else if (machine__normalized_is(machine, "arm")) {
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arch = CS_ARCH_ARM;
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mode = CS_MODE_ARM + CS_MODE_V8;
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} else if (machine__normalized_is(machine, "s390")) {
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arch = CS_ARCH_SYSZ;
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mode = CS_MODE_BIG_ENDIAN;
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} else {
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return -1;
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}
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if (cs_open(arch, mode, cs_handle) != CS_ERR_OK) {
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pr_warning_once("cs_open failed\n");
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return -1;
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}
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if (machine__normalized_is(machine, "x86")) {
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cs_option(*cs_handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_ATT);
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/*
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* Resolving address operands to symbols is implemented
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* on x86 by investigating instruction details.
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*/
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cs_option(*cs_handle, CS_OPT_DETAIL, CS_OPT_ON);
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}
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return 0;
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}
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static size_t print_insn_x86(struct perf_sample *sample, struct thread *thread,
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cs_insn *insn, FILE *fp)
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{
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struct addr_location al;
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size_t printed = 0;
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if (insn->detail && insn->detail->x86.op_count == 1) {
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cs_x86_op *op = &insn->detail->x86.operands[0];
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addr_location__init(&al);
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if (op->type == X86_OP_IMM &&
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thread__find_symbol(thread, sample->cpumode, op->imm, &al)) {
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printed += fprintf(fp, "%s ", insn[0].mnemonic);
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printed += symbol__fprintf_symname_offs(al.sym, &al, fp);
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addr_location__exit(&al);
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return printed;
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}
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addr_location__exit(&al);
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}
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printed += fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
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return printed;
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}
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size_t sample__fprintf_insn_asm(struct perf_sample *sample, struct thread *thread,
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struct machine *machine, FILE *fp)
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{
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csh cs_handle;
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cs_insn *insn;
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size_t count;
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size_t printed = 0;
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int ret;
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/* TODO: Try to initiate capstone only once but need a proper place. */
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ret = capstone_init(machine, &cs_handle);
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if (ret < 0) {
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/* fallback */
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return sample__fprintf_insn_raw(sample, fp);
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}
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count = cs_disasm(cs_handle, (uint8_t *)sample->insn, sample->insn_len,
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sample->ip, 1, &insn);
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if (count > 0) {
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if (machine__normalized_is(machine, "x86"))
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printed += print_insn_x86(sample, thread, &insn[0], fp);
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else
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printed += fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
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cs_free(insn, count);
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} else {
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printed += fprintf(fp, "illegal instruction");
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}
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cs_close(&cs_handle);
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return printed;
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}
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#else
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size_t sample__fprintf_insn_asm(struct perf_sample *sample __maybe_unused,
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struct thread *thread __maybe_unused,
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struct machine *machine __maybe_unused,
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FILE *fp __maybe_unused)
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{
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return 0;
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}
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#endif
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