mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-06 04:01:44 +00:00
84 lines
No EOL
3.2 KiB
C++
84 lines
No EOL
3.2 KiB
C++
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <mesosphere.hpp>
|
|
|
|
namespace ams::kern::init::Elf {
|
|
|
|
/* API to apply relocations or call init array. */
|
|
void ApplyRelocations(uintptr_t base_address, const Dyn *dynamic) {
|
|
uintptr_t dyn_rel = 0;
|
|
uintptr_t dyn_rela = 0;
|
|
uintptr_t rel_count = 0;
|
|
uintptr_t rela_count = 0;
|
|
uintptr_t rel_ent = 0;
|
|
uintptr_t rela_ent = 0;
|
|
|
|
/* Iterate over all tags, identifying important extents. */
|
|
for (const Dyn *cur_entry = dynamic; cur_entry->GetTag() != DT_NULL; cur_entry++) {
|
|
switch (cur_entry->GetTag()) {
|
|
case DT_REL:
|
|
dyn_rel = base_address + cur_entry->GetPtr();
|
|
break;
|
|
case DT_RELA:
|
|
dyn_rela = base_address + cur_entry->GetPtr();
|
|
break;
|
|
case DT_RELENT:
|
|
rel_ent = cur_entry->GetValue();
|
|
break;
|
|
case DT_RELAENT:
|
|
rela_ent = cur_entry->GetValue();
|
|
break;
|
|
case DT_RELCOUNT:
|
|
rel_count = cur_entry->GetValue();
|
|
break;
|
|
case DT_RELACOUNT:
|
|
rela_count = cur_entry->GetValue();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Apply all Rel relocations */
|
|
for (size_t i = 0; i < rel_count; i++) {
|
|
const auto &rel = *reinterpret_cast<const Elf::Rel *>(dyn_rel + rel_ent * i);
|
|
|
|
/* Only allow architecture-specific relocations. */
|
|
while (rel.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
|
|
|
|
/* Apply the relocation. */
|
|
Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rel.GetOffset());
|
|
*target_address += base_address;
|
|
}
|
|
|
|
/* Apply all Rela relocations. */
|
|
for (size_t i = 0; i < rela_count; i++) {
|
|
const auto &rela = *reinterpret_cast<const Elf::Rela *>(dyn_rela + rela_ent * i);
|
|
|
|
/* Only allow architecture-specific relocations. */
|
|
while (rela.GetType() != R_ARCHITECTURE_RELATIVE) { /* ... */ }
|
|
|
|
/* Apply the relocation. */
|
|
Elf::Addr *target_address = reinterpret_cast<Elf::Addr *>(base_address + rela.GetOffset());
|
|
*target_address = base_address + rela.GetAddend();
|
|
}
|
|
}
|
|
|
|
void CallInitArrayFuncs(uintptr_t init_array_start, uintptr_t init_array_end) {
|
|
for (uintptr_t cur_entry = init_array_start; cur_entry < init_array_end; cur_entry += sizeof(void *)) {
|
|
(*(void (**)())(cur_entry))();
|
|
}
|
|
}
|
|
|
|
} |