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lxdream.org :: lxdream/src/x86dasm/x86dasm.c
lxdream 0.9.1
released Jun 29
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filename src/x86dasm/x86dasm.c
changeset 365:94cab5ad0ed8
prev362:dc40e2064dc4
next376:8c7587af5a5d
author nkeynes
date Tue Sep 04 08:32:10 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Change sh4x86 test to translate/disasm full basic blocks
Add prelim sym-tab support
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     1 /**
     2  * $Id: x86dasm.c,v 1.2 2007-09-04 08:32:10 nkeynes Exp $
     3  *
     4  * Wrapper around i386-dis to supply the same behaviour as the other
     5  * disassembly functions.
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    20 #include <stdarg.h>
    21 #include "x86dasm.h"
    22 #include "bfd.h"
    23 #include "dis-asm.h"
    24 #include "sh4/sh4core.h"
    26 extern const struct reg_desc_struct sh4_reg_map[];
    27 const struct cpu_desc_struct x86_cpu_desc = 
    28     { "x86", x86_disasm_instruction, NULL, mem_has_page, 
    29       NULL, NULL, NULL, 1, 
    30       (char *)&sh4r, sizeof(sh4r), sh4_reg_map,
    31       &sh4r.pc };
    33 static int x86_disasm_output( void *data, const char *format, ... );
    34 static int x86_read_memory( bfd_vma memaddr, bfd_byte *buffer, unsigned int length,
    35 			    struct disassemble_info *info );
    36 static int x86_print_address( bfd_vma memaddr, struct disassemble_info *info );
    38 static struct disassemble_info x86_disasm_info;
    40 static x86_symbol *x86_symtab;
    41 static int x86_num_symbols = 0;   
    43 void x86_disasm_init(char *buf, uint32_t vma, int buflen)
    44 {
    45     init_disassemble_info( &x86_disasm_info, NULL, x86_disasm_output );
    46     x86_disasm_info.arch = bfd_arch_i386;
    47     x86_disasm_info.mach = bfd_mach_i386_i386_intel_syntax;
    48     x86_disasm_info.endian = BFD_ENDIAN_LITTLE;
    49     x86_disasm_info.buffer = buf;
    50     x86_disasm_info.buffer_vma = vma;
    51     x86_disasm_info.buffer_length = buflen;
    52     x86_disasm_info.print_address_func = x86_print_address;
    53 }
    55 void x86_set_symtab( x86_symbol *symtab, int num_symbols )
    56 {
    57     x86_symtab = symtab;
    58     x86_num_symbols = num_symbols;
    59 }
    61 static const char *x86_find_symbol( bfd_vma memaddr, struct disassemble_info *info )
    62 {
    63     int i;
    64     for( i=0; i<x86_num_symbols; i++ ) {
    65 	if( x86_symtab[i].ptr == (void *)memaddr ) {
    66 	    return x86_symtab[i].name;
    67 	}
    68     }
    69     return NULL;
    70 }
    72 static int x86_print_address( bfd_vma memaddr, struct disassemble_info *info )
    73 {
    74     const char *sym = x86_find_symbol(memaddr, info);
    75     info->fprintf_func( info->stream, "%08X", memaddr );
    76     if( sym != NULL ) {
    77 	info->fprintf_func( info->stream, " <%s>", sym );
    78     }
    79     return 0;
    80 }
    82 uint32_t x86_disasm_instruction( uint32_t pc, char *buf, int len, char *opcode )
    83 {
    84     int count, i;
    86     x86_disasm_info.stream = buf;
    87     buf[0] = 0;
    88     count = print_insn_i386_att( pc, &x86_disasm_info );
    89     if( count != 0 ) {
    90 	char tmp[count];
    91 	x86_disasm_info.read_memory_func( pc, tmp, count, &x86_disasm_info );
    92 	for( i=0; i<count; i++ ) {
    93 	    sprintf( opcode, "%02X ", ((unsigned int)tmp[i])&0xFF );
    94 	    opcode += 3;
    95 	}
    96 	*(opcode-1) = '\0';
    97     }
    98     return pc + count;
    99 }
   101 int x86_disasm_output( void *data, const char *format, ... )
   102 {
   103     char *p = (char *)data;
   104     va_list ap;
   105     int n;
   106     p += strlen(p);
   107     va_start( ap, format );
   108     n = vsprintf( p, format, ap );
   109     va_end( ap );
   110     return n;
   111 }
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