mirror of
https://github.com/scummvm/scummvm.git
synced 2026-05-21 05:40:43 +00:00
Miro Kropacek
121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/scummsys.h"
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#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(M68K_TARGET)
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#include "backends/plugins/elf/elf-loader.h"
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#include "backends/plugins/elf/m68k-loader.h"
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#include "common/debug.h"
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#include <mint/basepage.h>
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bool M68KDLObject::relocate(Elf32_Off offset, Elf32_Word size, byte *relSegment) {
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Elf32_Rela *rel = (Elf32_Rela *)malloc(size);
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if (!rel) {
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warning("elfloader: Could not allocate %d bytes for the relocation table", size);
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return false;
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}
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if (!_file->seek(offset, SEEK_SET) || _file->read(rel, size) != size) {
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warning("elfloader: Relocation table load failed.");
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free(rel);
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return false;
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}
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uint32 cnt = size / sizeof(*rel);
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debug(2, "elfloader: Loaded relocation table. %d entries. base address=%p", cnt, relSegment);
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for (uint32 i = 0; i < cnt; i++) {
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Elf32_Sym *sym = _symtab + REL_INDEX(rel[i].r_info);
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byte *src = relSegment + rel[i].r_offset - _segmentVMA;
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uint32 value = sym->st_value + rel[i].r_addend;
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switch (REL_TYPE(rel[i].r_info)) {
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case R_68K_NONE:
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break;
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case R_68K_32:
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*(uint32 *)src = value;
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debug(8, "elfloader: R_68K_32 -> 0x%08x", *(uint32 *)src);
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break;
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case R_68K_16:
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*(uint16 *)src = (uint16)value;
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debug(8, "elfloader: R_68K_16 -> 0x%04x", *(uint16 *)src);
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break;
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case R_68K_8:
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*src = (uint8)value;
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debug(8, "elfloader: R_68K_8 -> 0x%02x", *src);
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break;
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case R_68K_PC32:
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*(uint32 *)src = value - (uint32)src;
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debug(8, "elfloader: R_68K_PC32 -> 0x%08x", *(uint32 *)src);
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break;
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case R_68K_PC16:
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*(uint16 *)src = (uint16)(value - (uint32)src);
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debug(8, "elfloader: R_68K_PC16 -> 0x%04x", *(uint16 *)src);
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break;
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case R_68K_PC8:
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*src = (uint8)(value - (uint32)src);
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debug(8, "elfloader: R_68K_PC8 -> 0x%02x", *src);
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break;
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default:
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warning("elfloader: Unknown relocation type %d", REL_TYPE(rel[i].r_info));
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free(rel);
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return false;
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}
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}
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free(rel);
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return true;
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}
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bool M68KDLObject::relocateRels(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) {
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for (uint32 i = 0; i < ehdr->e_shnum; i++) {
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Elf32_Shdr *curShdr = &(shdr[i]);
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if ((curShdr->sh_type == SHT_REL) &&
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curShdr->sh_entsize == sizeof(Elf32_Rel) &&
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int32(curShdr->sh_link) == _symtab_sect &&
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curShdr->sh_info < ehdr->e_shnum &&
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(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {
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warning("elfloader: REL entries not supported on m68k!");
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return false;
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}
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if ((curShdr->sh_type == SHT_RELA) &&
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curShdr->sh_entsize == sizeof(Elf32_Rela) &&
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int32(curShdr->sh_link) == _symtab_sect &&
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curShdr->sh_info < ehdr->e_shnum &&
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(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {
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if (!relocate(curShdr->sh_offset, curShdr->sh_size, _segment))
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return false;
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}
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}
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return true;
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}
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#endif /* defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(M68K_TARGET) */
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