80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
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/* General "disassemble this chunk" code. Used for debugging. */
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#include "dis-asm.h"
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#include "disas.h"
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#include "elf.h"
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/* Filled in by elfload.c. Simplistic, but will do for now. */
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unsigned int disas_num_syms;
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void *disas_symtab;
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const char *disas_strtab;
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/* Disassemble this for me please... (debugging). */
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void disas(FILE *out, void *code, unsigned long size, enum disas_type type)
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{
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uint8_t *pc;
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int count;
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struct disassemble_info disasm_info;
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int (*print_insn)(bfd_vma pc, disassemble_info *info);
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INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
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disasm_info.buffer = code;
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disasm_info.buffer_vma = (unsigned long)code;
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disasm_info.buffer_length = size;
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if (type == DISAS_TARGET) {
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#ifdef WORDS_BIGENDIAN
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disasm_info.endian = BFD_ENDIAN_BIG;
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#else
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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#endif
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#ifdef __i386__
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disasm_info.mach = bfd_mach_i386_i386;
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print_insn = print_insn_i386;
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#elif defined(__powerpc__)
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print_insn = print_insn_ppc;
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#else
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fprintf(out, "Asm output not supported on this arch\n");
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return;
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#endif
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} else {
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/* Currently only source supported in x86. */
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disasm_info.endian = BFD_ENDIAN_LITTLE;
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if (type == DISAS_I386_I386)
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disasm_info.mach = bfd_mach_i386_i386;
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else
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disasm_info.mach = bfd_mach_i386_i8086;
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print_insn = print_insn_i386;
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}
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for (pc = code; pc < (uint8_t *)code + size; pc += count) {
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fprintf(out, "0x%08lx: ", (long)pc);
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count = print_insn((long)pc, &disasm_info);
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fprintf(out, "\n");
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if (count < 0)
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break;
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}
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}
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/* Look up symbol for debugging purpose. Returns "" if unknown. */
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const char *lookup_symbol(void *orig_addr)
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{
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unsigned int i;
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/* Hack, because we know this is x86. */
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Elf32_Sym *sym = disas_symtab;
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for (i = 0; i < disas_num_syms; i++) {
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if (sym[i].st_shndx == SHN_UNDEF
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|| sym[i].st_shndx >= SHN_LORESERVE)
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continue;
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if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
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continue;
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if ((long)orig_addr >= sym[i].st_value
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&& (long)orig_addr < sym[i].st_value + sym[i].st_size)
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return disas_strtab + sym[i].st_name;
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}
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return "";
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}
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