5c5cf2f8e0
The code now properly configures the process image to match the loaded binary segments (code, rodata, data) instead of just blindly allocating a large chunk of dummy memory.
271 lines
9.6 KiB
C++
271 lines
9.6 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 "common/logging/log.h"
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#include "core/file_sys/archive_romfs.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/resource_limit.h"
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#include "core/hle/service/fs/archive.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/memory.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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static const unsigned int NUM_SEGMENTS = 3;
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// File header
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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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static u32 TranslateAddr(u32 addr, const 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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using Kernel::SharedPtr;
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using Kernel::CodeSet;
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static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr, SharedPtr<CodeSet>* out_codeset)
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{
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if (!file.IsOpen())
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return ERROR_FILE;
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// Reset read pointer in case this file has been read before.
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file.Seek(0, SEEK_SET);
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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 n_reloc_tables = hdr.reloc_hdr_size / sizeof(u32);
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std::vector<u8> program_image(loadinfo.seg_sizes[0] + loadinfo.seg_sizes[1] + loadinfo.seg_sizes[2]);
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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] = program_image.data();
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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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std::vector<u32> relocs(n_reloc_tables * NUM_SEGMENTS);
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for (unsigned int current_segment = 0; current_segment < NUM_SEGMENTS; ++current_segment) {
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size_t size = n_reloc_tables * sizeof(u32);
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if (file.ReadBytes(&relocs[current_segment * n_reloc_tables], size) != size)
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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 (unsigned int current_segment = 0; current_segment < NUM_SEGMENTS; ++current_segment) {
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for (unsigned 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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THREEDSX_Reloc reloc_table[RELOCBUFSIZE];
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u32* pos = (u32*)loadinfo.seg_ptrs[current_segment];
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const 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 (unsigned current_inprogress = 0; current_inprogress < remaining && pos < end_pos; current_inprogress++) {
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const auto& table = reloc_table[current_inprogress];
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LOG_TRACE(Loader, "(t=%d,skip=%u,patch=%u)\n", current_segment_reloc_table,
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(u32)table.skip, (u32)table.patch);
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pos += table.skip;
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s32 num_patches = table.patch;
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while (0 < num_patches && pos < end_pos) {
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u32 in_addr = (u8*)pos - program_image.data();
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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:
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*pos = (addr);
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break;
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case 1:
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*pos = (addr - in_addr);
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break;
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default:
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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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// Create the CodeSet
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SharedPtr<CodeSet> code_set = CodeSet::Create("", 0);
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code_set->code.offset = loadinfo.seg_ptrs[0] - program_image.data();
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code_set->code.addr = loadinfo.seg_addrs[0];
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code_set->code.size = loadinfo.seg_sizes[0];
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code_set->rodata.offset = loadinfo.seg_ptrs[1] - program_image.data();
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code_set->rodata.addr = loadinfo.seg_addrs[1];
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code_set->rodata.size = loadinfo.seg_sizes[1];
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code_set->data.offset = loadinfo.seg_ptrs[2] - program_image.data();
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code_set->data.addr = loadinfo.seg_addrs[2];
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code_set->data.size = loadinfo.seg_sizes[2];
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code_set->entrypoint = code_set->code.addr;
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code_set->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
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LOG_DEBUG(Loader, "code size: 0x%X", loadinfo.seg_sizes[0]);
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LOG_DEBUG(Loader, "rodata size: 0x%X", loadinfo.seg_sizes[1]);
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LOG_DEBUG(Loader, "data size: 0x%X (including 0x%X of bss)", loadinfo.seg_sizes[2], hdr.bss_size);
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*out_codeset = code_set;
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return ERROR_NONE;
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}
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FileType AppLoader_THREEDSX::IdentifyType(FileUtil::IOFile& file) {
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u32 magic;
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file.Seek(0, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('3', 'D', 'S', 'X') == magic)
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return FileType::THREEDSX;
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return FileType::Error;
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}
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ResultStatus AppLoader_THREEDSX::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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if (!file->IsOpen())
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return ResultStatus::Error;
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SharedPtr<CodeSet> codeset;
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if (Load3DSXFile(*file, Memory::PROCESS_IMAGE_VADDR, &codeset) != ERROR_NONE)
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return ResultStatus::Error;
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codeset->name = filename;
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Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
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Kernel::g_current_process->svc_access_mask.set();
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Kernel::g_current_process->address_mappings = default_address_mappings;
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// Attach the default resource limit (APPLICATION) to the process
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Kernel::g_current_process->resource_limit = Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
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Kernel::g_current_process->Run(48, Kernel::DEFAULT_STACK_SIZE);
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is_loaded = true;
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return ResultStatus::Success;
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}
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} // namespace Loader
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