1 /*
2 * Routines for target instruction disassembly.
3 * SPDX-License-Identifier: GPL-2.0-or-later
4 */
5
6 #include "qemu/osdep.h"
7 #include "disas/disas.h"
8 #include "disas/capstone.h"
9 #include "exec/translator.h"
10 #include "disas-internal.h"
11
12
translator_read_memory(bfd_vma memaddr,bfd_byte * myaddr,int length,struct disassemble_info * info)13 static int translator_read_memory(bfd_vma memaddr, bfd_byte *myaddr,
14 int length, struct disassemble_info *info)
15 {
16 const DisasContextBase *db = info->application_data;
17 return translator_st(db, myaddr, memaddr, length) ? 0 : EIO;
18 }
19
target_disas(FILE * out,CPUState * cpu,const struct DisasContextBase * db)20 void target_disas(FILE *out, CPUState *cpu, const struct DisasContextBase *db)
21 {
22 uint64_t code = db->pc_first;
23 size_t size = translator_st_len(db);
24 uint64_t pc;
25 int count;
26 CPUDebug s;
27
28 disas_initialize_debug_target(&s, cpu);
29 s.info.read_memory_func = translator_read_memory;
30 s.info.application_data = (void *)db;
31 s.info.fprintf_func = fprintf;
32 s.info.stream = out;
33 s.info.buffer_vma = code;
34 s.info.buffer_length = size;
35 s.info.show_opcodes = true;
36
37 if (s.info.cap_arch >= 0 && cap_disas_target(&s.info, code, size)) {
38 return;
39 }
40
41 if (s.info.print_insn == NULL) {
42 s.info.print_insn = print_insn_od_target;
43 }
44
45 for (pc = code; size > 0; pc += count, size -= count) {
46 fprintf(out, "0x%08" PRIx64 ": ", pc);
47 count = s.info.print_insn(pc, &s.info);
48 fprintf(out, "\n");
49 if (count < 0) {
50 break;
51 }
52 if (size < count) {
53 fprintf(out,
54 "Disassembler disagrees with translator over instruction "
55 "decoding\n"
56 "Please report this to qemu-devel@nongnu.org\n");
57 break;
58 }
59 }
60 }
61
62 #ifdef CONFIG_PLUGIN
plugin_print_address(bfd_vma addr,struct disassemble_info * info)63 static void plugin_print_address(bfd_vma addr, struct disassemble_info *info)
64 {
65 /* does nothing */
66 }
67
68 /*
69 * We should only be dissembling one instruction at a time here. If
70 * there is left over it usually indicates the front end has read more
71 * bytes than it needed.
72 */
plugin_disas(CPUState * cpu,const DisasContextBase * db,uint64_t addr,size_t size)73 char *plugin_disas(CPUState *cpu, const DisasContextBase *db,
74 uint64_t addr, size_t size)
75 {
76 CPUDebug s;
77 GString *ds = g_string_new(NULL);
78
79 disas_initialize_debug_target(&s, cpu);
80 s.info.read_memory_func = translator_read_memory;
81 s.info.application_data = (void *)db;
82 s.info.fprintf_func = disas_gstring_printf;
83 s.info.stream = (FILE *)ds; /* abuse this slot */
84 s.info.buffer_vma = addr;
85 s.info.buffer_length = size;
86 s.info.print_address_func = plugin_print_address;
87
88 if (s.info.cap_arch >= 0 && cap_disas_plugin(&s.info, addr, size)) {
89 ; /* done */
90 } else if (s.info.print_insn) {
91 s.info.print_insn(addr, &s.info);
92 } else {
93 ; /* cannot disassemble -- return empty string */
94 }
95
96 /* Return the buffer, freeing the GString container. */
97 return g_string_free(ds, false);
98 }
99 #endif /* CONFIG_PLUGIN */
100