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 } 107