1 /* Disassemble from a buffer, for GNU.
2    Copyright (C) 1993-2016 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
buffer_read_memory(bfd_vma memaddr,bfd_byte * myaddr,unsigned int length,struct disassemble_info * info)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   unsigned int end_addr_offset = length / opb;
36   unsigned int max_addr_offset = info->buffer_length / opb;
37   unsigned int 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
perror_memory(int status,bfd_vma memaddr,struct disassemble_info * info)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       char buf[30];
65 
66       /* Actually, address between memaddr and memaddr + len was
67 	 out of bounds.  */
68       sprintf_vma (buf, memaddr);
69       info->fprintf_func (info->stream,
70 			  _("Address 0x%s is out of bounds.\n"), buf);
71     }
72 }
73 
74 /* This could be in a separate file, to save miniscule amounts of space
75    in statically linked executables.  */
76 
77 /* Just print the address is hex.  This is included for completeness even
78    though both GDB and objdump provide their own (to print symbolic
79    addresses).  */
80 
81 void
generic_print_address(bfd_vma addr,struct disassemble_info * info)82 generic_print_address (bfd_vma addr, struct disassemble_info *info)
83 {
84   char buf[30];
85 
86   sprintf_vma (buf, addr);
87   (*info->fprintf_func) (info->stream, "0x%s", buf);
88 }
89 
90 /* Just return true.  */
91 
92 int
generic_symbol_at_address(bfd_vma addr ATTRIBUTE_UNUSED,struct disassemble_info * info ATTRIBUTE_UNUSED)93 generic_symbol_at_address (bfd_vma addr ATTRIBUTE_UNUSED,
94 			   struct disassemble_info *info ATTRIBUTE_UNUSED)
95 {
96   return 1;
97 }
98 
99 /* Just return TRUE.  */
100 
101 bfd_boolean
generic_symbol_is_valid(asymbol * sym ATTRIBUTE_UNUSED,struct disassemble_info * info ATTRIBUTE_UNUSED)102 generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED,
103 			 struct disassemble_info *info ATTRIBUTE_UNUSED)
104 {
105   return TRUE;
106 }
107