forked from suyu/suyu
237 lines
8.3 KiB
C++
237 lines
8.3 KiB
C++
// Copyright 2014 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <algorithm>
|
|
#include <vector>
|
|
|
|
#include "core/file_sys/archive_romfs.h"
|
|
#include "core/loader/elf.h"
|
|
#include "core/loader/ncch.h"
|
|
#include "core/hle/service/fs/archive.h"
|
|
#include "core/mem_map.h"
|
|
|
|
#include "3dsx.h"
|
|
|
|
namespace Loader {
|
|
|
|
/**
|
|
* File layout:
|
|
* - File header
|
|
* - Code, rodata and data relocation table headers
|
|
* - Code segment
|
|
* - Rodata segment
|
|
* - Loadable (non-BSS) part of the data segment
|
|
* - Code relocation table
|
|
* - Rodata relocation table
|
|
* - Data relocation table
|
|
*
|
|
* Memory layout before relocations are applied:
|
|
* [0..codeSegSize) -> code segment
|
|
* [codeSegSize..rodataSegSize) -> rodata segment
|
|
* [rodataSegSize..dataSegSize) -> data segment
|
|
*
|
|
* Memory layout after relocations are applied: well, however the loader sets it up :)
|
|
* The entrypoint is always the start of the code segment.
|
|
* The BSS section must be cleared manually by the application.
|
|
*/
|
|
enum THREEDSX_Error {
|
|
ERROR_NONE = 0,
|
|
ERROR_READ = 1,
|
|
ERROR_FILE = 2,
|
|
ERROR_ALLOC = 3
|
|
};
|
|
static const u32 RELOCBUFSIZE = 512;
|
|
|
|
// File header
|
|
#pragma pack(1)
|
|
struct THREEDSX_Header
|
|
{
|
|
u32 magic;
|
|
u16 header_size, reloc_hdr_size;
|
|
u32 format_ver;
|
|
u32 flags;
|
|
|
|
// Sizes of the code, rodata and data segments +
|
|
// size of the BSS section (uninitialized latter half of the data segment)
|
|
u32 code_seg_size, rodata_seg_size, data_seg_size, bss_size;
|
|
};
|
|
|
|
// Relocation header: all fields (even extra unknown fields) are guaranteed to be relocation counts.
|
|
struct THREEDSX_RelocHdr
|
|
{
|
|
// # of absolute relocations (that is, fix address to post-relocation memory layout)
|
|
u32 cross_segment_absolute;
|
|
// # of cross-segment relative relocations (that is, 32bit signed offsets that need to be patched)
|
|
u32 cross_segment_relative;
|
|
// more?
|
|
|
|
// Relocations are written in this order:
|
|
// - Absolute relocations
|
|
// - Relative relocations
|
|
};
|
|
|
|
// Relocation entry: from the current pointer, skip X words and patch Y words
|
|
struct THREEDSX_Reloc
|
|
{
|
|
u16 skip, patch;
|
|
};
|
|
#pragma pack()
|
|
|
|
struct THREEloadinfo
|
|
{
|
|
u8* seg_ptrs[3]; // code, rodata & data
|
|
u32 seg_addrs[3];
|
|
u32 seg_sizes[3];
|
|
};
|
|
|
|
static u32 TranslateAddr(u32 addr, const THREEloadinfo *loadinfo, u32* offsets)
|
|
{
|
|
if (addr < offsets[0])
|
|
return loadinfo->seg_addrs[0] + addr;
|
|
if (addr < offsets[1])
|
|
return loadinfo->seg_addrs[1] + addr - offsets[0];
|
|
return loadinfo->seg_addrs[2] + addr - offsets[1];
|
|
}
|
|
|
|
static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr)
|
|
{
|
|
if (!file.IsOpen())
|
|
return ERROR_FILE;
|
|
|
|
// Reset read pointer in case this file has been read before.
|
|
file.Seek(0, SEEK_SET);
|
|
|
|
THREEDSX_Header hdr;
|
|
if (file.ReadBytes(&hdr, sizeof(hdr)) != sizeof(hdr))
|
|
return ERROR_READ;
|
|
|
|
THREEloadinfo loadinfo;
|
|
//loadinfo segments must be a multiple of 0x1000
|
|
loadinfo.seg_sizes[0] = (hdr.code_seg_size + 0xFFF) &~0xFFF;
|
|
loadinfo.seg_sizes[1] = (hdr.rodata_seg_size + 0xFFF) &~0xFFF;
|
|
loadinfo.seg_sizes[2] = (hdr.data_seg_size + 0xFFF) &~0xFFF;
|
|
u32 offsets[2] = { loadinfo.seg_sizes[0], loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] };
|
|
u32 data_load_size = (hdr.data_seg_size - hdr.bss_size + 0xFFF) &~0xFFF;
|
|
u32 bss_load_size = loadinfo.seg_sizes[2] - data_load_size;
|
|
u32 n_reloc_tables = hdr.reloc_hdr_size / 4;
|
|
std::vector<u8> all_mem(loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] + loadinfo.seg_sizes[2] + 3 * n_reloc_tables);
|
|
|
|
loadinfo.seg_addrs[0] = base_addr;
|
|
loadinfo.seg_addrs[1] = loadinfo.seg_addrs[0] + loadinfo.seg_sizes[0];
|
|
loadinfo.seg_addrs[2] = loadinfo.seg_addrs[1] + loadinfo.seg_sizes[1];
|
|
loadinfo.seg_ptrs[0] = &all_mem[0];
|
|
loadinfo.seg_ptrs[1] = loadinfo.seg_ptrs[0] + loadinfo.seg_sizes[0];
|
|
loadinfo.seg_ptrs[2] = loadinfo.seg_ptrs[1] + loadinfo.seg_sizes[1];
|
|
|
|
// Skip header for future compatibility
|
|
file.Seek(hdr.header_size, SEEK_SET);
|
|
|
|
// Read the relocation headers
|
|
u32* relocs = (u32*)(loadinfo.seg_ptrs[2] + hdr.data_seg_size);
|
|
|
|
for (unsigned current_segment : {0, 1, 2}) {
|
|
size_t size = n_reloc_tables * 4;
|
|
if (file.ReadBytes(&relocs[current_segment * n_reloc_tables], size) != size)
|
|
return ERROR_READ;
|
|
}
|
|
|
|
// Read the segments
|
|
if (file.ReadBytes(loadinfo.seg_ptrs[0], hdr.code_seg_size) != hdr.code_seg_size)
|
|
return ERROR_READ;
|
|
if (file.ReadBytes(loadinfo.seg_ptrs[1], hdr.rodata_seg_size) != hdr.rodata_seg_size)
|
|
return ERROR_READ;
|
|
if (file.ReadBytes(loadinfo.seg_ptrs[2], hdr.data_seg_size - hdr.bss_size) != hdr.data_seg_size - hdr.bss_size)
|
|
return ERROR_READ;
|
|
|
|
// BSS clear
|
|
memset((char*)loadinfo.seg_ptrs[2] + hdr.data_seg_size - hdr.bss_size, 0, hdr.bss_size);
|
|
|
|
// Relocate the segments
|
|
for (unsigned current_segment : {0, 1, 2}) {
|
|
for (unsigned current_segment_reloc_table = 0; current_segment_reloc_table < n_reloc_tables; current_segment_reloc_table++) {
|
|
u32 n_relocs = relocs[current_segment * n_reloc_tables + current_segment_reloc_table];
|
|
if (current_segment_reloc_table >= 2) {
|
|
// We are not using this table - ignore it because we don't know what it dose
|
|
file.Seek(n_relocs*sizeof(THREEDSX_Reloc), SEEK_CUR);
|
|
continue;
|
|
}
|
|
static THREEDSX_Reloc reloc_table[RELOCBUFSIZE];
|
|
|
|
u32* pos = (u32*)loadinfo.seg_ptrs[current_segment];
|
|
const u32* end_pos = pos + (loadinfo.seg_sizes[current_segment] / 4);
|
|
|
|
while (n_relocs) {
|
|
u32 remaining = std::min(RELOCBUFSIZE, n_relocs);
|
|
n_relocs -= remaining;
|
|
|
|
if (file.ReadBytes(reloc_table, remaining * sizeof(THREEDSX_Reloc)) != remaining * sizeof(THREEDSX_Reloc))
|
|
return ERROR_READ;
|
|
|
|
for (unsigned current_inprogress = 0; current_inprogress < remaining && pos < end_pos; current_inprogress++) {
|
|
const auto& table = reloc_table[current_inprogress];
|
|
LOG_TRACE(Loader, "(t=%d,skip=%u,patch=%u)\n", current_segment_reloc_table,
|
|
(u32)table.skip, (u32)table.patch);
|
|
pos += table.skip;
|
|
s32 num_patches = table.patch;
|
|
while (0 < num_patches && pos < end_pos) {
|
|
u32 in_addr = (char*)pos - (char*)&all_mem[0];
|
|
u32 addr = TranslateAddr(*pos, &loadinfo, offsets);
|
|
LOG_TRACE(Loader, "Patching %08X <-- rel(%08X,%d) (%08X)\n",
|
|
base_addr + in_addr, addr, current_segment_reloc_table, *pos);
|
|
switch (current_segment_reloc_table) {
|
|
case 0:
|
|
*pos = (addr);
|
|
break;
|
|
case 1:
|
|
*pos = (addr - in_addr);
|
|
break;
|
|
default:
|
|
break; //this should never happen
|
|
}
|
|
pos++;
|
|
num_patches--;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Write the data
|
|
memcpy(Memory::GetPointer(base_addr), &all_mem[0], loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] + loadinfo.seg_sizes[2]);
|
|
|
|
LOG_DEBUG(Loader, "CODE: %u pages\n", loadinfo.seg_sizes[0] / 0x1000);
|
|
LOG_DEBUG(Loader, "RODATA: %u pages\n", loadinfo.seg_sizes[1] / 0x1000);
|
|
LOG_DEBUG(Loader, "DATA: %u pages\n", data_load_size / 0x1000);
|
|
LOG_DEBUG(Loader, "BSS: %u pages\n", bss_load_size / 0x1000);
|
|
|
|
return ERROR_NONE;
|
|
}
|
|
|
|
FileType AppLoader_THREEDSX::IdentifyType(FileUtil::IOFile& file) {
|
|
u32 magic;
|
|
file.Seek(0, SEEK_SET);
|
|
if (1 != file.ReadArray<u32>(&magic, 1))
|
|
return FileType::Error;
|
|
|
|
if (MakeMagic('3', 'D', 'S', 'X') == magic)
|
|
return FileType::THREEDSX;
|
|
|
|
return FileType::Error;
|
|
}
|
|
|
|
ResultStatus AppLoader_THREEDSX::Load() {
|
|
if (is_loaded)
|
|
return ResultStatus::ErrorAlreadyLoaded;
|
|
|
|
if (!file->IsOpen())
|
|
return ResultStatus::Error;
|
|
|
|
Load3DSXFile(*file, 0x00100000);
|
|
Kernel::LoadExec(0x00100000);
|
|
|
|
is_loaded = true;
|
|
return ResultStatus::Success;
|
|
}
|
|
|
|
} // namespace Loader
|