mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
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/*
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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 <exosphere.hpp>
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#include "fusee_loader_uncompress.hpp"
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#include "program_lz4.h"
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namespace ams::nxboot::loader {
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namespace {
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constexpr uintptr_t ProgramImageBase = 0x40001000;
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constexpr uintptr_t ProgramImageEnd = 0x4003D000;
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constexpr size_t ProgramImageSizeMax = ProgramImageEnd - ProgramImageBase;
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void CopyBackwards(void *dst, const void *src, size_t size) {
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/* We want to copy 32-bits at a time from destination to source. */
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const size_t words = util::DivideUp(size, sizeof(u32));
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/* Convert to 32-bit pointers. */
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u32 *dst_32 = static_cast<u32 *>(dst) + words;
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const u32 *src_32 = static_cast<const u32 *>(src) + words;
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/* Copy data. */
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for (size_t i = 0; i < words; ++i) {
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*(--dst_32) = *(--src_32);
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}
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}
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}
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NORETURN void UncompressAndExecute(const void *program, size_t program_size) {
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/* Relocate the compressed binary to a place where we can safely decompress it. */
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void *relocated_program = reinterpret_cast<void *>(util::AlignDown(ProgramImageEnd - program_size, sizeof(u32)));
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if (relocated_program != program) {
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CopyBackwards(relocated_program, program, program_size);
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}
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/* Uncompress the program image. */
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Uncompress(reinterpret_cast<void *>(ProgramImageBase), ProgramImageSizeMax, relocated_program, program_size);
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/* Jump to the boot image. */
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reinterpret_cast<void (*)()>(ProgramImageBase)();
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/* We will never reach this point. */
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__builtin_unreachable();
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}
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}
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