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// SPDX-License-Identifier: GPL-2.0
/*
* Instruction binary disassembler based on capstone.
*
* Author(s): Changbin Du <changbin.du@huawei.com>
*/
#include <inttypes.h>
#include <string.h>
#include <stdbool.h>
#include "debug.h"
#include "sample.h"
#include "symbol.h"
#include "machine.h"
#include "thread.h"
#include "print_insn.h"
#include "dump-insn.h"
#include "map.h"
#include "dso.h"
size_t sample__fprintf_insn_raw(struct perf_sample *sample, FILE *fp)
{
int printed = 0;
for (int i = 0; i < sample->insn_len; i++) {
printed += fprintf(fp, "%02x", (unsigned char)sample->insn[i]);
if (sample->insn_len - i > 1)
printed += fprintf(fp, " ");
}
return printed;
}
#ifdef HAVE_LIBCAPSTONE_SUPPORT
#include <capstone/capstone.h>
int capstone_init(struct machine *machine, csh *cs_handle, bool is64, bool disassembler_style);
int capstone_init(struct machine *machine, csh *cs_handle, bool is64, bool disassembler_style)
{
cs_arch arch;
cs_mode mode;
if (machine__is(machine, "x86_64") && is64) {
arch = CS_ARCH_X86;
mode = CS_MODE_64;
} else if (machine__normalized_is(machine, "x86")) {
arch = CS_ARCH_X86;
mode = CS_MODE_32;
} else if (machine__normalized_is(machine, "arm64")) {
arch = CS_ARCH_ARM64;
mode = CS_MODE_ARM;
} else if (machine__normalized_is(machine, "arm")) {
arch = CS_ARCH_ARM;
mode = CS_MODE_ARM + CS_MODE_V8;
} else if (machine__normalized_is(machine, "s390")) {
arch = CS_ARCH_SYSZ;
mode = CS_MODE_BIG_ENDIAN;
} else {
return -1;
}
if (cs_open(arch, mode, cs_handle) != CS_ERR_OK) {
pr_warning_once("cs_open failed\n");
return -1;
}
if (machine__normalized_is(machine, "x86")) {
/*
* In case of using capstone_init while symbol__disassemble
* setting CS_OPT_SYNTAX_ATT depends if disassembler_style opts
* is set via annotation args
*/
if (disassembler_style)
cs_option(*cs_handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_ATT);
/*
* Resolving address operands to symbols is implemented
* on x86 by investigating instruction details.
*/
cs_option(*cs_handle, CS_OPT_DETAIL, CS_OPT_ON);
}
return 0;
}
static size_t print_insn_x86(struct thread *thread, u8 cpumode, cs_insn *insn,
int print_opts, FILE *fp)
{
struct addr_location al;
size_t printed = 0;
if (insn->detail && insn->detail->x86.op_count == 1) {
cs_x86_op *op = &insn->detail->x86.operands[0];
addr_location__init(&al);
if (op->type == X86_OP_IMM &&
thread__find_symbol(thread, cpumode, op->imm, &al)) {
printed += fprintf(fp, "%s ", insn[0].mnemonic);
printed += symbol__fprintf_symname_offs(al.sym, &al, fp);
if (print_opts & PRINT_INSN_IMM_HEX)
printed += fprintf(fp, " [%#" PRIx64 "]", op->imm);
addr_location__exit(&al);
return printed;
}
addr_location__exit(&al);
}
printed += fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
return printed;
}
static bool is64bitip(struct machine *machine, struct addr_location *al)
{
const struct dso *dso = al->map ? map__dso(al->map) : NULL;
if (dso)
return dso__is_64_bit(dso);
return machine__is(machine, "x86_64") ||
machine__normalized_is(machine, "arm64") ||
machine__normalized_is(machine, "s390");
}
ssize_t fprintf_insn_asm(struct machine *machine, struct thread *thread, u8 cpumode,
bool is64bit, const uint8_t *code, size_t code_size,
uint64_t ip, int *lenp, int print_opts, FILE *fp)
{
size_t printed;
cs_insn *insn;
csh cs_handle;
size_t count;
int ret;
/* TODO: Try to initiate capstone only once but need a proper place. */
ret = capstone_init(machine, &cs_handle, is64bit, true);
if (ret < 0)
return ret;
count = cs_disasm(cs_handle, code, code_size, ip, 1, &insn);
if (count > 0) {
if (machine__normalized_is(machine, "x86"))
printed = print_insn_x86(thread, cpumode, &insn[0], print_opts, fp);
else
printed = fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
if (lenp)
*lenp = insn->size;
cs_free(insn, count);
} else {
printed = -1;
}
cs_close(&cs_handle);
return printed;
}
size_t sample__fprintf_insn_asm(struct perf_sample *sample, struct thread *thread,
struct machine *machine, FILE *fp,
struct addr_location *al)
{
bool is64bit = is64bitip(machine, al);
ssize_t printed;
printed = fprintf_insn_asm(machine, thread, sample->cpumode, is64bit,
(uint8_t *)sample->insn, sample->insn_len,
sample->ip, NULL, 0, fp);
if (printed < 0)
return sample__fprintf_insn_raw(sample, fp);
return printed;
}
#else
size_t sample__fprintf_insn_asm(struct perf_sample *sample __maybe_unused,
struct thread *thread __maybe_unused,
struct machine *machine __maybe_unused,
FILE *fp __maybe_unused,
struct addr_location *al __maybe_unused)
{
return 0;
}
#endif
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