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234 lines
8.4 KiB
C++
234 lines
8.4 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <vector>
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#include "core/file_sys/archive_romfs.h"
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#include "core/loader/elf.h"
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#include "core/loader/ncch.h"
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#include "core/hle/service/fs/archive.h"
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#include "core/mem_map.h"
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#include "3dsx.h"
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namespace Loader {
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/**
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* File layout:
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* - File header
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* - Code, rodata and data relocation table headers
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* - Code segment
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* - Rodata segment
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* - Loadable (non-BSS) part of the data segment
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* - Code relocation table
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* - Rodata relocation table
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* - Data relocation table
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*
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* Memory layout before relocations are applied:
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* [0..codeSegSize) -> code segment
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* [codeSegSize..rodataSegSize) -> rodata segment
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* [rodataSegSize..dataSegSize) -> data segment
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*
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* Memory layout after relocations are applied: well, however the loader sets it up :)
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* The entrypoint is always the start of the code segment.
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* The BSS section must be cleared manually by the application.
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*/
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enum THREEDSX_Error {
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ERROR_NONE = 0,
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ERROR_READ = 1,
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ERROR_FILE = 2,
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ERROR_ALLOC = 3
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};
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static const u32 RELOCBUFSIZE = 512;
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// File header
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static const u32 THREEDSX_MAGIC = 0x58534433; // '3DSX'
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#pragma pack(1)
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struct THREEDSX_Header
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{
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u32 magic;
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u16 header_size, reloc_hdr_size;
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u32 format_ver;
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u32 flags;
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// Sizes of the code, rodata and data segments +
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// size of the BSS section (uninitialized latter half of the data segment)
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u32 code_seg_size, rodata_seg_size, data_seg_size, bss_size;
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};
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// Relocation header: all fields (even extra unknown fields) are guaranteed to be relocation counts.
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struct THREEDSX_RelocHdr
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{
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// # of absolute relocations (that is, fix address to post-relocation memory layout)
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u32 cross_segment_absolute;
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// # of cross-segment relative relocations (that is, 32bit signed offsets that need to be patched)
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u32 cross_segment_relative;
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// more?
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// Relocations are written in this order:
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// - Absolute relocations
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// - Relative relocations
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};
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// Relocation entry: from the current pointer, skip X words and patch Y words
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struct THREEDSX_Reloc
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{
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u16 skip, patch;
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};
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#pragma pack()
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struct THREEloadinfo
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{
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u8* seg_ptrs[3]; // code, rodata & data
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u32 seg_addrs[3];
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u32 seg_sizes[3];
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};
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class THREEDSXReader {
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public:
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static int Load3DSXFile(const std::string& filename, u32 base_addr);
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};
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static u32 TranslateAddr(u32 addr, THREEloadinfo *loadinfo, u32* offsets)
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{
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if (addr < offsets[0])
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return loadinfo->seg_addrs[0] + addr;
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if (addr < offsets[1])
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return loadinfo->seg_addrs[1] + addr - offsets[0];
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return loadinfo->seg_addrs[2] + addr - offsets[1];
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}
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int THREEDSXReader::Load3DSXFile(const std::string& filename, u32 base_addr)
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{
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FileUtil::IOFile file(filename, "rb");
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if (!file.IsOpen()) {
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return ERROR_FILE;
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}
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THREEDSX_Header hdr;
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if (file.ReadBytes(&hdr, sizeof(hdr)) != sizeof(hdr))
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return ERROR_READ;
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THREEloadinfo loadinfo;
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//loadinfo segments must be a multiple of 0x1000
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loadinfo.seg_sizes[0] = (hdr.code_seg_size + 0xFFF) &~0xFFF;
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loadinfo.seg_sizes[1] = (hdr.rodata_seg_size + 0xFFF) &~0xFFF;
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loadinfo.seg_sizes[2] = (hdr.data_seg_size + 0xFFF) &~0xFFF;
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u32 offsets[2] = { loadinfo.seg_sizes[0], loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] };
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u32 data_load_size = (hdr.data_seg_size - hdr.bss_size + 0xFFF) &~0xFFF;
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u32 bss_load_size = loadinfo.seg_sizes[2] - data_load_size;
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u32 n_reloc_tables = hdr.reloc_hdr_size / 4;
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std::vector<u8> all_mem(loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] + loadinfo.seg_sizes[2] + 3 * n_reloc_tables);
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loadinfo.seg_addrs[0] = base_addr;
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loadinfo.seg_addrs[1] = loadinfo.seg_addrs[0] + loadinfo.seg_sizes[0];
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loadinfo.seg_addrs[2] = loadinfo.seg_addrs[1] + loadinfo.seg_sizes[1];
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loadinfo.seg_ptrs[0] = &all_mem[0];
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loadinfo.seg_ptrs[1] = loadinfo.seg_ptrs[0] + loadinfo.seg_sizes[0];
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loadinfo.seg_ptrs[2] = loadinfo.seg_ptrs[1] + loadinfo.seg_sizes[1];
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// Skip header for future compatibility
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file.Seek(hdr.header_size, SEEK_SET);
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// Read the relocation headers
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u32* relocs = (u32*)(loadinfo.seg_ptrs[2] + hdr.data_seg_size);
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for (u32 current_segment = 0; current_segment < 3; current_segment++) {
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if (file.ReadBytes(&relocs[current_segment*n_reloc_tables], n_reloc_tables * 4) != n_reloc_tables * 4)
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return ERROR_READ;
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}
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// Read the segments
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if (file.ReadBytes(loadinfo.seg_ptrs[0], hdr.code_seg_size) != hdr.code_seg_size)
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return ERROR_READ;
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if (file.ReadBytes(loadinfo.seg_ptrs[1], hdr.rodata_seg_size) != hdr.rodata_seg_size)
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return ERROR_READ;
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if (file.ReadBytes(loadinfo.seg_ptrs[2], hdr.data_seg_size - hdr.bss_size) != hdr.data_seg_size - hdr.bss_size)
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return ERROR_READ;
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// BSS clear
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memset((char*)loadinfo.seg_ptrs[2] + hdr.data_seg_size - hdr.bss_size, 0, hdr.bss_size);
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// Relocate the segments
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for (u32 current_segment = 0; current_segment < 3; current_segment++) {
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for (u32 current_segment_reloc_table = 0; current_segment_reloc_table < n_reloc_tables; current_segment_reloc_table++) {
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u32 n_relocs = relocs[current_segment*n_reloc_tables + current_segment_reloc_table];
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if (current_segment_reloc_table >= 2) {
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// We are not using this table - ignore it because we don't know what it dose
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file.Seek(n_relocs*sizeof(THREEDSX_Reloc), SEEK_CUR);
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continue;
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}
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static THREEDSX_Reloc reloc_table[RELOCBUFSIZE];
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u32* pos = (u32*)loadinfo.seg_ptrs[current_segment];
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u32* end_pos = pos + (loadinfo.seg_sizes[current_segment] / 4);
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while (n_relocs) {
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u32 remaining = std::min(RELOCBUFSIZE, n_relocs);
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n_relocs -= remaining;
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if (file.ReadBytes(reloc_table, remaining*sizeof(THREEDSX_Reloc)) != remaining*sizeof(THREEDSX_Reloc))
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return ERROR_READ;
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for (u32 current_inprogress = 0; current_inprogress < remaining && pos < end_pos; current_inprogress++) {
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LOG_TRACE(Loader, "(t=%d,skip=%u,patch=%u)\n",
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current_segment_reloc_table, (u32)reloc_table[current_inprogress].skip, (u32)reloc_table[current_inprogress].patch);
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pos += reloc_table[current_inprogress].skip;
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s32 num_patches = reloc_table[current_inprogress].patch;
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while (0 < num_patches && pos < end_pos) {
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u32 in_addr = (char*)pos - (char*)&all_mem[0];
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u32 addr = TranslateAddr(*pos, &loadinfo, offsets);
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LOG_TRACE(Loader, "Patching %08X <-- rel(%08X,%d) (%08X)\n",
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base_addr + in_addr, addr, current_segment_reloc_table, *pos);
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switch (current_segment_reloc_table) {
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case 0: *pos = (addr); break;
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case 1: *pos = (addr - in_addr); break;
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default: break; //this should never happen
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}
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pos++;
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num_patches--;
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}
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}
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}
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}
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}
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// Write the data
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memcpy(Memory::GetPointer(base_addr), &all_mem[0], loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] + loadinfo.seg_sizes[2]);
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LOG_DEBUG(Loader, "CODE: %u pages\n", loadinfo.seg_sizes[0] / 0x1000);
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LOG_DEBUG(Loader, "RODATA: %u pages\n", loadinfo.seg_sizes[1] / 0x1000);
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LOG_DEBUG(Loader, "DATA: %u pages\n", data_load_size / 0x1000);
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LOG_DEBUG(Loader, "BSS: %u pages\n", bss_load_size / 0x1000);
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return ERROR_NONE;
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}
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/// AppLoader_DSX constructor
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AppLoader_THREEDSX::AppLoader_THREEDSX(const std::string& filename) : filename(filename) {
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}
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/// AppLoader_DSX destructor
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AppLoader_THREEDSX::~AppLoader_THREEDSX() {
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}
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/**
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* Loads a 3DSX file
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* @return Success on success, otherwise Error
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*/
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ResultStatus AppLoader_THREEDSX::Load() {
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LOG_INFO(Loader, "Loading 3DSX file %s...", filename.c_str());
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FileUtil::IOFile file(filename, "rb");
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if (file.IsOpen()) {
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THREEDSXReader::Load3DSXFile(filename, 0x00100000);
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Kernel::LoadExec(0x00100000);
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} else {
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return ResultStatus::Error;
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}
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return ResultStatus::Success;
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}
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} // namespace Loader
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