1/* Disassemble from a buffer, for GNU. 2 Copyright (C) 1993-2022 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. */ 28int 29buffer_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 54void 55perror_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 79void 80generic_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 87asymbol * 88generic_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 96bool 97generic_symbol_is_valid (asymbol * sym ATTRIBUTE_UNUSED, 98 struct disassemble_info *info ATTRIBUTE_UNUSED) 99{ 100 return true; 101} 102