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lxdream.org :: lxdream/src/x86dasm/dis-buf.c
lxdream 0.9.1
released Jun 29
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filename src/x86dasm/dis-buf.c
changeset 362:dc40e2064dc4
next755:ab873907b00e
author nkeynes
date Tue Aug 28 08:46:54 2007 +0000 (14 years ago)
permissions -rw-r--r--
last change Add the i386 disassembler from binutils (why write your own if you don't
have to) to use for translator validation
view annotate diff log raw
     1 /* Disassemble from a buffer, for GNU.
     2    Copyright 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
     3    Free Software Foundation, Inc.
     5 This program is free software; you can redistribute it and/or modify
     6 it under the terms of the GNU General Public License as published by
     7 the Free Software Foundation; either version 2 of the License, or
     8 (at your option) any later version.
    10 This program is distributed in the hope that it will be useful,
    11 but WITHOUT ANY WARRANTY; without even the implied warranty of
    12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13 GNU General Public License for more details.
    15 You should have received a copy of the GNU General Public License
    16 along with this program; if not, write to the Free Software
    17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
    19 #include "sysdep.h"
    20 #include "dis-asm.h"
    21 #include <errno.h>
    22 #include "opintl.h"
    24 /* Get LENGTH bytes from info's buffer, at target address memaddr.
    25    Transfer them to myaddr.  */
    26 int
    27 buffer_read_memory (memaddr, myaddr, length, info)
    28      bfd_vma memaddr;
    29      bfd_byte *myaddr;
    30      unsigned int length;
    31      struct disassemble_info *info;
    32 {
    33   unsigned int opb = info->octets_per_byte;
    34   unsigned int end_addr_offset = length / opb;
    35   unsigned int max_addr_offset = info->buffer_length / opb; 
    36   unsigned int octets = (memaddr - info->buffer_vma) * opb;
    38   if (memaddr < info->buffer_vma
    39       || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset)
    40     /* Out of bounds.  Use EIO because GDB uses it.  */
    41     return EIO;
    42   memcpy (myaddr, info->buffer + octets, length);
    44   return 0;
    45 }
    47 /* Print an error message.  We can assume that this is in response to
    48    an error return from buffer_read_memory.  */
    49 void
    50 perror_memory (status, memaddr, info)
    51      int status;
    52      bfd_vma memaddr;
    53      struct disassemble_info *info;
    54 {
    55   if (status != EIO)
    56     /* Can't happen.  */
    57     info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
    58   else
    59     {
    60       char buf[30];
    62       /* Actually, address between memaddr and memaddr + len was
    63 	 out of bounds.  */
    64       sprintf_vma (buf, memaddr);
    65       info->fprintf_func (info->stream,
    66 			  _("Address 0x%s is out of bounds.\n"), buf);
    67     }
    68 }
    70 /* This could be in a separate file, to save miniscule amounts of space
    71    in statically linked executables.  */
    73 /* Just print the address is hex.  This is included for completeness even
    74    though both GDB and objdump provide their own (to print symbolic
    75    addresses).  */
    77 void
    78 generic_print_address (addr, info)
    79      bfd_vma addr;
    80      struct disassemble_info *info;
    81 {
    82   char buf[30];
    84   sprintf_vma (buf, addr);
    85   (*info->fprintf_func) (info->stream, "0x%s", buf);
    86 }
    88 #if 0
    89 /* Just concatenate the address as hex.  This is included for
    90    completeness even though both GDB and objdump provide their own (to
    91    print symbolic addresses).  */
    93 void generic_strcat_address PARAMS ((bfd_vma, char *, int));
    95 void
    96 generic_strcat_address (addr, buf, len)
    97      bfd_vma addr;
    98      char *buf;
    99      int len;
   100 {
   101   if (buf != (char *)NULL && len > 0)
   102     {
   103       char tmpBuf[30];
   105       sprintf_vma (tmpBuf, addr);
   106       if ((strlen (buf) + strlen (tmpBuf)) <= (unsigned int) len)
   107 	strcat (buf, tmpBuf);
   108       else
   109 	strncat (buf, tmpBuf, (len - strlen(buf)));
   110     }
   111   return;
   112 }
   113 #endif
   115 /* Just return true.  */
   117 int
   118 generic_symbol_at_address (addr, info)
   119      bfd_vma addr ATTRIBUTE_UNUSED;
   120      struct disassemble_info *info ATTRIBUTE_UNUSED;
   121 {
   122   return 1;
   123 }
   125 /* Just return TRUE.  */
   127 bfd_boolean
   128 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
   129 			 struct disassemble_info *info ATTRIBUTE_UNUSED)
   130 {
   131   return TRUE;
   132 }
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