| 1 | /* Disassemble from a buffer, for GNU. |
| 2 | Copyright (C) 1993-2020 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 | 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 |
| 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 |
| 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 |
| 102 | generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED, |
| 103 | struct disassemble_info *info ATTRIBUTE_UNUSED) |
| 104 | { |
| 105 | return TRUE; |
| 106 | } |