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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Instruction binary disassembler based on capstone.
4 *
5 * Author(s): Changbin Du <changbin.du@huawei.com>
6 */
7#include <inttypes.h>
8#include <string.h>
9#include <stdbool.h>
10#include "debug.h"
11#include "sample.h"
12#include "symbol.h"
13#include "machine.h"
14#include "thread.h"
15#include "print_insn.h"
16#include "dump-insn.h"
17#include "map.h"
18#include "dso.h"
19
20size_t sample__fprintf_insn_raw(struct perf_sample *sample, FILE *fp)
21{
22 int printed = 0;
23
24 for (int i = 0; i < sample->insn_len; i++) {
25 printed += fprintf(fp, "%02x", (unsigned char)sample->insn[i]);
26 if (sample->insn_len - i > 1)
27 printed += fprintf(fp, " ");
28 }
29 return printed;
30}
31
32#ifdef HAVE_LIBCAPSTONE_SUPPORT
33#include <capstone/capstone.h>
34
35int capstone_init(struct machine *machine, csh *cs_handle, bool is64, bool disassembler_style);
36
37int capstone_init(struct machine *machine, csh *cs_handle, bool is64, bool disassembler_style)
38{
39 cs_arch arch;
40 cs_mode mode;
41
42 if (machine__is(machine, "x86_64") && is64) {
43 arch = CS_ARCH_X86;
44 mode = CS_MODE_64;
45 } else if (machine__normalized_is(machine, "x86")) {
46 arch = CS_ARCH_X86;
47 mode = CS_MODE_32;
48 } else if (machine__normalized_is(machine, "arm64")) {
49 arch = CS_ARCH_ARM64;
50 mode = CS_MODE_ARM;
51 } else if (machine__normalized_is(machine, "arm")) {
52 arch = CS_ARCH_ARM;
53 mode = CS_MODE_ARM + CS_MODE_V8;
54 } else if (machine__normalized_is(machine, "s390")) {
55 arch = CS_ARCH_SYSZ;
56 mode = CS_MODE_BIG_ENDIAN;
57 } else {
58 return -1;
59 }
60
61 if (cs_open(arch, mode, cs_handle) != CS_ERR_OK) {
62 pr_warning_once("cs_open failed\n");
63 return -1;
64 }
65
66 if (machine__normalized_is(machine, "x86")) {
67 /*
68 * In case of using capstone_init while symbol__disassemble
69 * setting CS_OPT_SYNTAX_ATT depends if disassembler_style opts
70 * is set via annotation args
71 */
72 if (disassembler_style)
73 cs_option(*cs_handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_ATT);
74 /*
75 * Resolving address operands to symbols is implemented
76 * on x86 by investigating instruction details.
77 */
78 cs_option(*cs_handle, CS_OPT_DETAIL, CS_OPT_ON);
79 }
80
81 return 0;
82}
83
84static size_t print_insn_x86(struct thread *thread, u8 cpumode, cs_insn *insn,
85 int print_opts, FILE *fp)
86{
87 struct addr_location al;
88 size_t printed = 0;
89
90 if (insn->detail && insn->detail->x86.op_count == 1) {
91 cs_x86_op *op = &insn->detail->x86.operands[0];
92
93 addr_location__init(&al);
94 if (op->type == X86_OP_IMM &&
95 thread__find_symbol(thread, cpumode, op->imm, &al)) {
96 printed += fprintf(fp, "%s ", insn[0].mnemonic);
97 printed += symbol__fprintf_symname_offs(al.sym, &al, fp);
98 if (print_opts & PRINT_INSN_IMM_HEX)
99 printed += fprintf(fp, " [%#" PRIx64 "]", op->imm);
100 addr_location__exit(&al);
101 return printed;
102 }
103 addr_location__exit(&al);
104 }
105
106 printed += fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
107 return printed;
108}
109
110static bool is64bitip(struct machine *machine, struct addr_location *al)
111{
112 const struct dso *dso = al->map ? map__dso(al->map) : NULL;
113
114 if (dso)
115 return dso__is_64_bit(dso);
116
117 return machine__is(machine, "x86_64") ||
118 machine__normalized_is(machine, "arm64") ||
119 machine__normalized_is(machine, "s390");
120}
121
122ssize_t fprintf_insn_asm(struct machine *machine, struct thread *thread, u8 cpumode,
123 bool is64bit, const uint8_t *code, size_t code_size,
124 uint64_t ip, int *lenp, int print_opts, FILE *fp)
125{
126 size_t printed;
127 cs_insn *insn;
128 csh cs_handle;
129 size_t count;
130 int ret;
131
132 /* TODO: Try to initiate capstone only once but need a proper place. */
133 ret = capstone_init(machine, &cs_handle, is64bit, true);
134 if (ret < 0)
135 return ret;
136
137 count = cs_disasm(cs_handle, code, code_size, ip, 1, &insn);
138 if (count > 0) {
139 if (machine__normalized_is(machine, "x86"))
140 printed = print_insn_x86(thread, cpumode, &insn[0], print_opts, fp);
141 else
142 printed = fprintf(fp, "%s %s", insn[0].mnemonic, insn[0].op_str);
143 if (lenp)
144 *lenp = insn->size;
145 cs_free(insn, count);
146 } else {
147 printed = -1;
148 }
149
150 cs_close(&cs_handle);
151 return printed;
152}
153
154size_t sample__fprintf_insn_asm(struct perf_sample *sample, struct thread *thread,
155 struct machine *machine, FILE *fp,
156 struct addr_location *al)
157{
158 bool is64bit = is64bitip(machine, al);
159 ssize_t printed;
160
161 printed = fprintf_insn_asm(machine, thread, sample->cpumode, is64bit,
162 (uint8_t *)sample->insn, sample->insn_len,
163 sample->ip, NULL, 0, fp);
164 if (printed < 0)
165 return sample__fprintf_insn_raw(sample, fp);
166
167 return printed;
168}
169#else
170size_t sample__fprintf_insn_asm(struct perf_sample *sample __maybe_unused,
171 struct thread *thread __maybe_unused,
172 struct machine *machine __maybe_unused,
173 FILE *fp __maybe_unused,
174 struct addr_location *al __maybe_unused)
175{
176 return 0;
177}
178#endif