1 /* Capstone Disassembler Engine */
2 /* By Spike <spikeinhouse@gmail.com>, 2018 */
3
4 #include <stdio.h>
5 #include <stdlib.h>
6
7 #include <capstone/platform.h>
8 #include <capstone/capstone.h>
9
10 static csh handle;
11
12 struct platform {
13 cs_arch arch;
14 cs_mode mode;
15 unsigned char *code;
16 size_t size;
17 const char *comment;
18 };
19
print_string_hex(const char * comment,unsigned char * str,size_t len)20 static void print_string_hex(const char *comment, unsigned char *str, size_t len)
21 {
22 unsigned char *c;
23
24 printf("%s", comment);
25 for (c = str; c < str + len; c++) {
26 printf("0x%02x ", *c & 0xff);
27 }
28
29 printf("\n");
30 }
31
print_insn_detail(csh cs_handle,cs_insn * ins)32 static void print_insn_detail(csh cs_handle, cs_insn *ins)
33 {
34 cs_wasm *wasm;
35
36 // detail can be NULL on "data" instruction if SKIPDATA option is turned ON
37 if (ins->detail == NULL)
38 return;
39
40 if (ins->detail->groups_count) {
41 int j;
42
43 printf("\tGroups: ");
44 for(j = 0; j < ins->detail->groups_count; j++) {
45 printf("%s ", cs_group_name(handle, ins->detail->groups[j]));
46 }
47 printf("\n");
48 }
49
50 wasm = &(ins->detail->wasm);
51
52 if (wasm->op_count > 0) {
53 unsigned int i;
54
55 printf("\tOperand count: %u\n", wasm->op_count);
56
57 for (i = 0; i < wasm->op_count; i++) {
58 switch (wasm->operands[i].type) {
59 default:
60 break;
61 case WASM_OP_INT7:
62 printf("\t\tOperand[%u] type: int7\n", i);
63 printf("\t\tOperand[%u] value: %d\n", i, wasm->operands[i].int7);
64 break;
65 case WASM_OP_UINT32:
66 printf("\t\tOperand[%u] type: uint32\n", i);
67 printf("\t\tOperand[%u] value: 0x%x\n", i, wasm->operands[i].uint32);
68 break;
69 case WASM_OP_UINT64:
70 printf("\t\tOperand[%u] type: uint64\n", i);
71 printf("\t\tOperand[%u] value: 0x%" PRIx64 "\n", i, wasm->operands[i].uint64);
72 break;
73 case WASM_OP_VARUINT32:
74 printf("\t\tOperand[%u] type: varuint32\n", i);
75 printf("\t\tOperand[%u] value: 0x%x\n", i, wasm->operands[i].varuint32);
76 break;
77 case WASM_OP_VARUINT64:
78 printf("\t\tOperand[%u] type: varuint64\n", i);
79 printf("\t\tOperand[%u] value: 0x%" PRIx64 "\n", i, wasm->operands[i].varuint64);
80 break;
81 }
82 printf("\t\tOperand[%u] size: %u\n", i, wasm->operands[i].size);
83 }
84 }
85 }
86
test()87 static void test()
88 {
89 #define WASM_CODE "\x20\x00\x20\x01\x41\x20\x10\xc9\x01\x45\x0b"
90 struct platform platforms[] = {
91 {
92 CS_ARCH_WASM,
93 0,
94 (unsigned char *)WASM_CODE,
95 sizeof(WASM_CODE) - 1,
96 "WASM"
97 },
98 };
99
100 uint64_t address = 0xffff;
101 cs_insn *insn;
102 size_t count;
103 int i;
104
105 for (i = 0; i < sizeof(platforms)/sizeof(platforms[0]); i++) {
106 cs_err err = cs_open(platforms[i].arch, platforms[i].mode, &handle);
107 if (err) {
108 printf("Failed on cs_open() with error returned: %u\n", err);
109 abort();
110 }
111
112 cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON);
113
114 count = cs_disasm(handle, platforms[i].code, platforms[i].size, address, 0, &insn);
115 if (count) {
116 size_t j;
117 printf("****************\n");
118 printf("Platform: %s\n", platforms[i].comment);
119 print_string_hex("Code: ", platforms[i].code, platforms[i].size);
120 printf("Disasm:\n");
121
122 for (j = 0; j < count; j++) {
123 printf("0x%" PRIx64 ":\t%s\t%s\n", insn[j].address, insn[j].mnemonic, insn[j].op_str);
124 print_insn_detail(handle, &insn[j]);
125 }
126 printf("0x%" PRIx64 ":\n", insn[j-1].address + insn[j-1].size);
127
128 // free memory allocated by cs_disasm()
129 cs_free(insn, count);
130 } else {
131 printf("****************\n");
132 printf("Platform: %s\n", platforms[i].comment);
133 print_string_hex("Code: ", platforms[i].code, platforms[i].size);
134 printf("ERROR: Failed to disasm given code!\n");
135 abort();
136 }
137
138 printf("\n");
139
140 cs_close(&handle);
141 }
142 }
143
main()144 int main()
145 {
146 test();
147 return 0;
148 }
149
150