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added ARM and Sparc disassemblers
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1 /* General "disassemble this chunk" code. Used for debugging. */
2 #include "dis-asm.h"
3 #include "disas.h"
4 #include "elf.h"
5 #include <errno.h>
6
7 /* Filled in by elfload.c. Simplistic, but will do for now. */
8 unsigned int disas_num_syms;
9 void *disas_symtab;
10 const char *disas_strtab;
11
12 /* Get LENGTH bytes from info's buffer, at target address memaddr.
13 Transfer them to myaddr. */
14 int
15 buffer_read_memory (memaddr, myaddr, length, info)
16 bfd_vma memaddr;
17 bfd_byte *myaddr;
18 int length;
19 struct disassemble_info *info;
20 {
21 if (memaddr < info->buffer_vma
22 || memaddr + length > info->buffer_vma + info->buffer_length)
23 /* Out of bounds. Use EIO because GDB uses it. */
24 return EIO;
25 memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
26 return 0;
27 }
28
29 /* Print an error message. We can assume that this is in response to
30 an error return from buffer_read_memory. */
31 void
32 perror_memory (status, memaddr, info)
33 int status;
34 bfd_vma memaddr;
35 struct disassemble_info *info;
36 {
37 if (status != EIO)
38 /* Can't happen. */
39 (*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
40 else
41 /* Actually, address between memaddr and memaddr + len was
42 out of bounds. */
43 (*info->fprintf_func) (info->stream,
44 "Address 0x%x is out of bounds.\n", memaddr);
45 }
46
47 /* This could be in a separate file, to save miniscule amounts of space
48 in statically linked executables. */
49
50 /* Just print the address is hex. This is included for completeness even
51 though both GDB and objdump provide their own (to print symbolic
52 addresses). */
53
54 void
55 generic_print_address (addr, info)
56 bfd_vma addr;
57 struct disassemble_info *info;
58 {
59 (*info->fprintf_func) (info->stream, "0x%x", addr);
60 }
61
62 /* Just return the given address. */
63
64 int
65 generic_symbol_at_address (addr, info)
66 bfd_vma addr;
67 struct disassemble_info * info;
68 {
69 return 1;
70 }
71
72 bfd_vma bfd_getl32 (const bfd_byte *addr)
73 {
74 unsigned long v;
75
76 v = (unsigned long) addr[0];
77 v |= (unsigned long) addr[1] << 8;
78 v |= (unsigned long) addr[2] << 16;
79 v |= (unsigned long) addr[3] << 24;
80 return (bfd_vma) v;
81 }
82
83 bfd_vma bfd_getb32 (const bfd_byte *addr)
84 {
85 unsigned long v;
86
87 v = (unsigned long) addr[0] << 24;
88 v |= (unsigned long) addr[1] << 16;
89 v |= (unsigned long) addr[2] << 8;
90 v |= (unsigned long) addr[3];
91 return (bfd_vma) v;
92 }
93
94 /* Disassemble this for me please... (debugging). */
95 void disas(FILE *out, void *code, unsigned long size, enum disas_type type)
96 {
97 uint8_t *pc;
98 int count;
99 struct disassemble_info disasm_info;
100 int (*print_insn)(bfd_vma pc, disassemble_info *info);
101
102 INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
103
104 disasm_info.buffer = code;
105 disasm_info.buffer_vma = (unsigned long)code;
106 disasm_info.buffer_length = size;
107
108 if (type == DISAS_TARGET) {
109 #ifdef WORDS_BIGENDIAN
110 disasm_info.endian = BFD_ENDIAN_BIG;
111 #else
112 disasm_info.endian = BFD_ENDIAN_LITTLE;
113 #endif
114 #ifdef __i386__
115 disasm_info.mach = bfd_mach_i386_i386;
116 print_insn = print_insn_i386;
117 #elif defined(__powerpc__)
118 print_insn = print_insn_ppc;
119 #elif defined(__alpha__)
120 print_insn = print_insn_alpha;
121 #elif defined(__sparc__)
122 print_insn = print_insn_sparc;
123 #elif defined(__arm__)
124 print_insn = print_insn_arm;
125 #else
126 fprintf(out, "Asm output not supported on this arch\n");
127 return;
128 #endif
129 } else {
130 /* Currently only source supported in x86. */
131 disasm_info.endian = BFD_ENDIAN_LITTLE;
132 if (type == DISAS_I386_I386)
133 disasm_info.mach = bfd_mach_i386_i386;
134 else
135 disasm_info.mach = bfd_mach_i386_i8086;
136 print_insn = print_insn_i386;
137 }
138
139 for (pc = code; pc < (uint8_t *)code + size; pc += count) {
140 fprintf(out, "0x%08lx: ", (long)pc);
141 #ifdef __arm__
142 /* since data are included in the code, it is better to
143 display code data too */
144 if (type == DISAS_TARGET) {
145 fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
146 }
147 #endif
148 count = print_insn((unsigned long)pc, &disasm_info);
149 fprintf(out, "\n");
150 if (count < 0)
151 break;
152 }
153 }
154
155 /* Look up symbol for debugging purpose. Returns "" if unknown. */
156 const char *lookup_symbol(void *orig_addr)
157 {
158 unsigned int i;
159 /* Hack, because we know this is x86. */
160 Elf32_Sym *sym = disas_symtab;
161
162 for (i = 0; i < disas_num_syms; i++) {
163 if (sym[i].st_shndx == SHN_UNDEF
164 || sym[i].st_shndx >= SHN_LORESERVE)
165 continue;
166
167 if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
168 continue;
169
170 if ((long)orig_addr >= sym[i].st_value
171 && (long)orig_addr < sym[i].st_value + sym[i].st_size)
172 return disas_strtab + sym[i].st_name;
173 }
174 return "";
175 }