mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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84 lines
No EOL
3.2 KiB
C++
84 lines
No EOL
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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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#include <mesosphere.hpp>
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namespace ams::kern::init::Elf {
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/* API to apply relocations or call init array. */
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void ApplyRelocations(uintptr_t base_address, const Dyn *dynamic) {
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uintptr_t dyn_rel = 0;
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uintptr_t dyn_rela = 0;
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uintptr_t rel_count = 0;
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uintptr_t rela_count = 0;
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uintptr_t rel_ent = 0;
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uintptr_t rela_ent = 0;
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/* Iterate over all tags, identifying important extents. */
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for (const Dyn *cur_entry = dynamic; cur_entry->GetTag() != DT_NULL; cur_entry++) {
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switch (cur_entry->GetTag()) {
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case DT_REL:
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dyn_rel = base_address + cur_entry->GetPtr();
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break;
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case DT_RELA:
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dyn_rela = base_address + cur_entry->GetPtr();
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break;
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case DT_RELENT:
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rel_ent = cur_entry->GetValue();
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break;
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case DT_RELAENT:
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rela_ent = cur_entry->GetValue();
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break;
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case DT_RELCOUNT:
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rel_count = cur_entry->GetValue();
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break;
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case DT_RELACOUNT:
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rela_count = cur_entry->GetValue();
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break;
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}
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}
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/* Apply all Rel relocations */
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for (size_t i = 0; i < rel_count; i++) {
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const auto &rel = *reinterpret_cast<const Elf::Rel *>(dyn_rel + rel_ent * i);
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/* Only allow architecture-specific relocations. */
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while (rel.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
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/* Apply the relocation. */
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Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rel.GetOffset());
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*target_address += base_address;
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}
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/* Apply all Rela relocations. */
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for (size_t i = 0; i < rela_count; i++) {
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const auto &rela = *reinterpret_cast<const Elf::Rela *>(dyn_rela + rela_ent * i);
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/* Only allow architecture-specific relocations. */
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while (rela.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
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/* Apply the relocation. */
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Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rela.GetOffset());
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*target_address = base_address + rela.GetAddend();
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}
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}
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void CallInitArrayFuncs(uintptr_t init_array_start, uintptr_t init_array_end) {
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for (uintptr_t cur_entry = init_array_start; cur_entry < init_array_end; cur_entry += sizeof(void *)) {
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(*(void (**)())(cur_entry))();
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}
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}
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} |