opcodes/dis-buf.c

   1 /* Disassemble from a buffer, for GNU.
   2    Copyright (C) 1993-2024 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU opcodes library.
   5
   6    This library is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    It is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  14    License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "sysdep.h"
  22 #include "dis-asm.h"
  23 #include <errno.h>
  24 #include "opintl.h"
  25
  26 /* Get LENGTH bytes from info's buffer, at target address memaddr.
  27    Transfer them to myaddr.  */
  28 int
  29 buffer_read_memory (bfd_vma memaddr,
  30                     bfd_byte *myaddr,
  31                     unsigned int length,
  32                     struct disassemble_info *info)
  33 {
  34   unsigned int opb = info->octets_per_byte;
  35   size_t end_addr_offset = length / opb;
  36   size_t max_addr_offset = info->buffer_length / opb;
  37   size_t octets = (memaddr - info->buffer_vma) * opb;
  38
  39   if (memaddr < info->buffer_vma
  40       || memaddr - info->buffer_vma > max_addr_offset
  41       || memaddr - info->buffer_vma + end_addr_offset > max_addr_offset
  42       || (info->stop_vma && (memaddr >= info->stop_vma
  43                              || memaddr + end_addr_offset > info->stop_vma)))
  44     /* Out of bounds.  Use EIO because GDB uses it.  */
  45     return EIO;
  46   memcpy (myaddr, info->buffer + octets, length);
  47
  48   return 0;
  49 }
  50
  51 /* Print an error message.  We can assume that this is in response to
  52    an error return from buffer_read_memory.  */
  53
  54 void
  55 perror_memory (int status,
  56                bfd_vma memaddr,
  57                struct disassemble_info *info)
  58 {
  59   if (status != EIO)
  60     /* Can't happen.  */
  61     info->fprintf_func (info->stream, _("Unknown error %d\n"), status);
  62   else
  63     {
  64       /* Actually, address between memaddr and memaddr + len was
  65          out of bounds.  */
  66       info->fprintf_func (info->stream,
  67                           _("Address 0x%" PRIx64 " is out of bounds.\n"),
  68                           (uint64_t) memaddr);
  69     }
  70 }
  71
  72 /* This could be in a separate file, to save miniscule amounts of space
  73    in statically linked executables.  */
  74
  75 /* Just print the address is hex.  This is included for completeness even
  76    though both GDB and objdump provide their own (to print symbolic
  77    addresses).  */
  78
  79 void
  80 generic_print_address (bfd_vma addr, struct disassemble_info *info)
  81 {
  82   (*info->fprintf_func) (info->stream, "0x%08" PRIx64, (uint64_t) addr);
  83 }
  84
  85 /* Just return NULL.  */
  86
  87 asymbol *
  88 generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
  89                            struct disassemble_info *info ATTRIBUTE_UNUSED)
  90 {
  91   return NULL;
  92 }
  93
  94 /* Just return TRUE.  */
  95
  96 bool
  97 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
  98                          struct disassemble_info *info ATTRIBUTE_UNUSED)
  99 {
 100   return true;
 101 }