mirror of
https://github.com/libretro/scummvm.git
synced 2025-01-05 09:10:29 +00:00
126 lines
3.9 KiB
C++
126 lines
3.9 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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(PPC_TARGET)
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#include "backends/plugins/elf/elf-loader.h"
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#include "backends/plugins/elf/ppc-loader.h"
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#include "common/debug.h"
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bool PPCDLObject::relocate(Elf32_Off offset, Elf32_Word size, byte *relSegment) {
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Elf32_Rela *rel = NULL;
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if (!(rel = (Elf32_Rela *)malloc(size))) {
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warning("elfloader: Out of memory.");
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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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uint32 *src;
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uint32 value;
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for (uint32 i = 0; i < cnt; i++) {
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// Get the symbol this relocation entry is referring to
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Elf32_Sym *sym = _symtab + (REL_INDEX(rel[i].r_info));
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// Get the target instruction in the code
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src = (uint32 *)((char *)relSegment + rel[i].r_offset - _segmentVMA);
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value = sym->st_value + rel[i].r_addend;
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//debug(8, "elfloader: i=%05d %p +0x%04x: (0x%08x) 0x%08x ", i, src, rel[i].r_addend, sym->st_value, *src);
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switch (REL_TYPE(rel[i].r_info)) {
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case R_PPC_ADDR32:
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*src = value;
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debug(8, "elfloader: R_PPC_ADDR32 -> 0x%08x", *src);
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break;
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case R_PPC_ADDR16_LO:
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*(uint16 *)src = value;
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debug(8, "elfloader: R_PPC_ADDR16_LO -> 0x%08x", *src);
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break;
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case R_PPC_ADDR16_HI:
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*(uint16 *)src = value >> 16;
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debug(8, "elfloader: R_PPC_ADDR16_HA -> 0x%08x", *src);
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break;
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case R_PPC_ADDR16_HA:
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*(uint16 *)src = (value + 0x8000) >> 16;
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debug(8, "elfloader: R_PPC_ADDR16_HA -> 0x%08x", *src);
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break;
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case R_PPC_REL24:
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*src = (*src & ~0x03fffffc) | ((value - (uint32)src) & 0x03fffffc);
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debug(8, "elfloader: R_PPC_REL24 -> 0x%08x", *src);
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break;
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case R_PPC_REL32:
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*src = value - (uint32)src;
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debug(8, "elfloader: R_PPC_REL32 -> 0x%08x", *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 PPCDLObject::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!");
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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(PPC_TARGET) */
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