mirror of
https://github.com/libretro/ppsspp.git
synced 2024-12-12 19:07:34 +00:00
624 lines
16 KiB
C++
624 lines
16 KiB
C++
// Copyright (c) 2012- PPSSPP Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0 or later versions.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official git repository and contact information can be found at
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// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
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#include "Core/MemMap.h"
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#include "Core/Reporting.h"
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#include "Core/MIPS/MIPSTables.h"
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#include "ElfReader.h"
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#include "Core/Debugger/Breakpoints.h"
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#include "Core/Debugger/SymbolMap.h"
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#include "Core/HLE/sceKernelMemory.h"
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const char *ElfReader::GetSectionName(int section)
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{
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if (sections[section].sh_type == SHT_NULL)
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return 0;
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int nameOffset = sections[section].sh_name;
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const char *ptr = (const char *)GetSectionDataPtr(header->e_shstrndx);
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if (ptr)
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return ptr + nameOffset;
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else
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return 0;
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}
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void addrToHiLo(u32 addr, u16 &hi, s16 &lo)
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{
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lo = (addr & 0xFFFF);
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u32 naddr = addr - lo;
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hi = naddr>>16;
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u32 test = (hi<<16) + lo;
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if (test != addr)
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{
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WARN_LOG_REPORT(LOADER, "HI16/LO16 relocation failure?");
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}
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}
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bool ElfReader::LoadRelocations(Elf32_Rel *rels, int numRelocs)
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{
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int numErrors = 0;
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DEBUG_LOG(LOADER, "Loading %i relocations...", numRelocs);
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for (int r = 0; r < numRelocs; r++)
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{
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// INFO_LOG(LOADER, "Loading reloc %i (%p)...", r, rels + r);
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u32 info = rels[r].r_info;
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u32 addr = rels[r].r_offset;
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int type = info & 0xf;
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int readwrite = (info>>8) & 0xff;
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int relative = (info>>16) & 0xff;
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//0 = code
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//1 = data
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if (readwrite >= (int)ARRAY_SIZE(segmentVAddr)) {
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if (numErrors < 10) {
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ERROR_LOG_REPORT(LOADER, "Bad segment number %i", readwrite);
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}
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numErrors++;
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continue;
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}
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addr += segmentVAddr[readwrite];
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// It appears that misaligned relocations are allowed.
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// Will they work correctly on big-endian?
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if (((addr & 3) && type != R_MIPS_32) || !Memory::IsValidAddress(addr)) {
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if (numErrors < 10) {
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WARN_LOG_REPORT(LOADER, "Suspicious address %08x, skipping reloc, type = %d", addr, type);
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} else if (numErrors == 10) {
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WARN_LOG(LOADER, "Too many bad relocations, skipping logging");
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}
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numErrors++;
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continue;
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}
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u32 op = Memory::Read_Instruction(addr).encoding;
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const bool log = false;
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//log=true;
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if (log) {
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DEBUG_LOG(LOADER,"rel at: %08x info: %08x type: %i",addr, info, type);
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}
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u32 relocateTo = segmentVAddr[relative];
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switch (type)
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{
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case R_MIPS_32:
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if (log)
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DEBUG_LOG(LOADER,"Full address reloc %08x", addr);
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//full address, no problemo
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op += relocateTo;
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break;
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case R_MIPS_26: //j, jal
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//add on to put in correct address space
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if (log)
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DEBUG_LOG(LOADER,"j/jal reloc %08x", addr);
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op = (op & 0xFC000000) | (((op&0x03FFFFFF)+(relocateTo>>2))&0x03FFFFFF);
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break;
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case R_MIPS_HI16: //lui part of lui-addiu pairs
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{
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if (log)
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DEBUG_LOG(LOADER,"HI reloc %08x", addr);
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u32 cur = (op & 0xFFFF) << 16;
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u16 hi = 0;
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bool found = false;
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for (int t = r + 1; t<numRelocs; t++)
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{
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if ((rels[t].r_info & 0xF) == R_MIPS_LO16)
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{
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u32 corrLoAddr = rels[t].r_offset + segmentVAddr[readwrite];
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if (log) {
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DEBUG_LOG(LOADER,"Corresponding lo found at %08x", corrLoAddr);
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}
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if (Memory::IsValidAddress(corrLoAddr)) {
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s16 lo = (s32)(s16)(u16)(Memory::ReadUnchecked_U32(corrLoAddr) & 0xFFFF); //signed??
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cur += lo;
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cur += relocateTo;
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addrToHiLo(cur, hi, lo);
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found = true;
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break;
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} else {
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ERROR_LOG(LOADER, "Bad corrLoAddr %08x", corrLoAddr);
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}
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}
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}
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if (!found) {
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ERROR_LOG_REPORT(LOADER, "R_MIPS_HI16: could not find R_MIPS_LO16");
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}
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op = (op & 0xFFFF0000) | (hi);
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}
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break;
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case R_MIPS_LO16: //addiu part of lui-addiu pairs
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{
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if (log)
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DEBUG_LOG(LOADER,"LO reloc %08x", addr);
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u32 cur = op & 0xFFFF;
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cur += relocateTo;
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cur &= 0xFFFF;
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op = (op & 0xFFFF0000) | cur;
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}
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break;
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case R_MIPS_GPREL16: //gp
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// It seems safe to ignore this, almost a notification of a gp-relative operation?
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break;
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case R_MIPS_16:
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{
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char temp[256];
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op = (op & 0xFFFF0000) | (((int)(op & 0xFFFF) + (int)relocateTo) & 0xFFFF);
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MIPSDisAsm(MIPSOpcode(op), 0, temp);
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}
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break;
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case R_MIPS_NONE:
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// This shouldn't matter, not sure the purpose of it.
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break;
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default:
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{
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char temp[256];
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MIPSDisAsm(MIPSOpcode(op), 0, temp);
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ERROR_LOG_REPORT(LOADER,"ARGH IT'S AN UNKNOWN RELOCATION!!!!!!!! %08x, type=%d : %s", addr, type, temp);
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}
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break;
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}
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Memory::Write_U32(op, addr);
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}
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if (numErrors) {
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WARN_LOG(LOADER, "%i bad relocations found!!!", numErrors);
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}
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return numErrors == 0;
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}
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void ElfReader::LoadRelocations2(int rel_seg)
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{
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Elf32_Phdr *ph;
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u8 *buf, *end, *flag_table, *type_table;
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int flag_table_size, type_table_size;
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int flag_bits, seg_bits, type_bits;
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int cmd, flag, seg, type;
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int off_seg = 0, addr_seg, rel_base, rel_offset;
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int relocate_to, last_type, lo16 = 0;
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u32 op, addr;
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int rcount = 0;
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ph = segments + rel_seg;
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buf = (u8*)GetSegmentPtr(rel_seg);
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end = buf+ph->p_filesz;
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flag_bits = buf[2];
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type_bits = buf[3];
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seg_bits = 1;
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while((1<<seg_bits)<rel_seg)
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seg_bits += 1;
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buf += 4;
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flag_table = buf;
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flag_table_size = flag_table[0];
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buf += flag_table_size;
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type_table = buf;
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type_table_size = type_table[0];
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buf += type_table_size;
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rel_base = 0;
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last_type = -1;
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while(buf<end){
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cmd = *(u16*)(buf);
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buf += 2;
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flag = ( cmd<<(16-flag_bits))&0xffff;
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flag = (flag>>(16-flag_bits))&0xffff;
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flag = flag_table[flag];
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seg = (cmd<<(16-seg_bits-flag_bits))&0xffff;
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seg = (seg>>(16-seg_bits))&0xffff;
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type = ( cmd<<(16-type_bits-seg_bits-flag_bits))&0xffff;
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type = (type>>(16-type_bits))&0xffff;
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type = type_table[type];
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if((flag&0x01)==0){
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off_seg = seg;
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if((flag&0x06)==0){
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rel_base = cmd>>(seg_bits+flag_bits);
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}else if((flag&0x06)==4){
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rel_base = buf[0] | (buf[1]<<8) | (buf[2]<<16) | (buf[3]<<24);
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buf += 4;
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}else{
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ERROR_LOG_REPORT(LOADER, "Rel2: invalid size flag! %x", flag);
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rel_base = 0;
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}
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}else{
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addr_seg = seg;
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relocate_to = segmentVAddr[addr_seg];
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if((flag&0x06)==0x00){
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rel_offset = cmd;
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if(cmd&0x8000){
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rel_offset |= 0xffff0000;
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rel_offset >>= type_bits+seg_bits+flag_bits;
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rel_offset |= 0xffff0000;
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}else{
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rel_offset >>= type_bits+seg_bits+flag_bits;
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}
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rel_base += rel_offset;
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}else if((flag&0x06)==0x02){
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rel_offset = cmd;
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if(cmd&0x8000)
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rel_offset |= 0xffff0000;
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rel_offset >>= type_bits+seg_bits+flag_bits;
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rel_offset = (rel_offset<<16) | (buf[0]) | (buf[1]<<8);
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buf += 2;
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rel_base += rel_offset;
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}else if((flag&0x06)==0x04){
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rel_base = buf[0] | (buf[1]<<8) | (buf[2]<<16) | (buf[3]<<24);
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buf += 4;
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}else{
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ERROR_LOG_REPORT(LOADER, "Rel2: invalid relocat size flag! %x", flag);
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}
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rel_offset = rel_base+segmentVAddr[off_seg];
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if((flag&0x38)==0x00){
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lo16 = 0;
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}else if((flag&0x38)==0x08){
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if(last_type!=0x04)
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lo16 = 0;
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}else if((flag&0x38)==0x10){
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lo16 = (buf[0]) | (buf[1]<<8);
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if(lo16&0x8000)
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lo16 |= 0xffff0000;
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buf += 2;
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}else{
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ERROR_LOG_REPORT(LOADER, "Rel2: invalid lo16 type! %x", flag);
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}
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op = Memory::Read_Instruction(rel_offset).encoding;
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DEBUG_LOG(LOADER, "Rel2: %5d: CMD=0x%04X flag=%x type=%d off_seg=%d offset=%08x addr_seg=%d op=%08x\n", rcount, cmd, flag, type, off_seg, rel_base, addr_seg, op);
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switch(type){
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case 0:
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continue;
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case 2: // R_MIPS_32
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op += relocate_to;
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break;
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case 3: // R_MIPS_26
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case 6: // R_MIPS_J26
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case 7: // R_MIPS_JAL26
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op = (op&0xFC000000) | (((op&0x03FFFFFF)+(relocate_to>>2))&0x03FFFFFF);
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// To be safe, let's force it to the specified jump.
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if (type == 6)
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op = (op & ~0xFC000000) | 0x08000000;
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else if (type == 7)
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op = (op & ~0xFC000000) | 0x0C000000;
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break;
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case 4: // R_MIPS_HI16
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addr = ((op<<16)+lo16)+relocate_to;
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if(addr&0x8000)
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addr += 0x00010000;
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op = (op&0xffff0000) | (addr>>16 );
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break;
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case 1:
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case 5: // R_MIPS_LO16
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op = (op&0xffff0000) | (((op&0xffff)+relocate_to)&0xffff);
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break;
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default:
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ERROR_LOG_REPORT(LOADER, "Rel2: unexpected relocation type! %x", type);
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break;
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}
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Memory::Write_U32(op, rel_offset);
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rcount += 1;
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}
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}
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}
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int ElfReader::LoadInto(u32 loadAddress)
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{
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DEBUG_LOG(LOADER,"String section: %i", header->e_shstrndx);
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if (header->e_ident[0] != ELFMAG0 || header->e_ident[1] != ELFMAG1
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|| header->e_ident[2] != ELFMAG2 || header->e_ident[3] != ELFMAG3)
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return SCE_KERNEL_ERROR_UNSUPPORTED_PRX_TYPE;
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// technically ELFCLASSNONE would freeze the system, but that's not really desireable
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if (header->e_ident[EI_CLASS] != ELFCLASS32) {
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if (header->e_ident[EI_CLASS] != 0) {
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return SCE_KERNEL_ERROR_MEMBLOCK_ALLOC_FAILED;
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}
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ERROR_LOG(LOADER, "Bad ELF, EI_CLASS (fifth byte) is 0x00, should be 0x01 - would lock up a PSP.");
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}
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if (header->e_ident[EI_DATA] != ELFDATA2LSB)
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return SCE_KERNEL_ERROR_MEMBLOCK_ALLOC_FAILED;
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// e_ident[EI_VERSION] is ignored
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sectionOffsets = new u32[GetNumSections()];
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sectionAddrs = new u32[GetNumSections()];
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// Should we relocate?
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bRelocate = (header->e_type != ET_EXEC);
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entryPoint = header->e_entry;
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u32 totalStart = 0xFFFFFFFF;
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u32 totalEnd = 0;
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for (int i = 0; i < header->e_phnum; i++) {
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Elf32_Phdr *p = &segments[i];
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if (p->p_type == PT_LOAD) {
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if (p->p_vaddr < totalStart)
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totalStart = p->p_vaddr;
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if (p->p_vaddr + p->p_memsz > totalEnd)
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totalEnd = p->p_vaddr + p->p_memsz;
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}
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}
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totalSize = totalEnd - totalStart;
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if (!bRelocate)
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{
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// Binary is prerelocated, load it where the first segment starts
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vaddr = userMemory.AllocAt(totalStart, totalSize, "ELF");
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}
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else if (loadAddress)
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{
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// Binary needs to be relocated: add loadAddress to the binary start address
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vaddr = userMemory.AllocAt(loadAddress + totalStart, totalSize, "ELF");
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}
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else
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{
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// Just put it where there is room
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vaddr = userMemory.Alloc(totalSize, false, "ELF");
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}
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if (vaddr == (u32)-1) {
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ERROR_LOG_REPORT(LOADER, "Failed to allocate memory for ELF!");
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return SCE_KERNEL_ERROR_MEMBLOCK_ALLOC_FAILED;
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}
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if (bRelocate) {
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DEBUG_LOG(LOADER,"Relocatable module");
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entryPoint += vaddr;
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} else {
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DEBUG_LOG(LOADER,"Prerelocated executable");
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}
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DEBUG_LOG(LOADER,"%i segments:", header->e_phnum);
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// First pass : Get the damn bits into RAM
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u32 baseAddress = bRelocate?vaddr:0;
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for (int i=0; i<header->e_phnum; i++)
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{
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Elf32_Phdr *p = segments + i;
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DEBUG_LOG(LOADER, "Type: %08x Vaddr: %08x Filesz: %08x Memsz: %08x ", (int)p->p_type, (u32)p->p_vaddr, (int)p->p_filesz, (int)p->p_memsz);
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if (p->p_type == PT_LOAD)
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{
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segmentVAddr[i] = baseAddress + p->p_vaddr;
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u32 writeAddr = segmentVAddr[i];
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u8 *src = GetSegmentPtr(i);
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u8 *dst = Memory::GetPointer(writeAddr);
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u32 srcSize = p->p_filesz;
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u32 dstSize = p->p_memsz;
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if (srcSize < dstSize)
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{
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memset(dst + srcSize, 0, dstSize - srcSize); //zero out bss
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}
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memcpy(dst, src, srcSize);
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CBreakPoints::ExecMemCheck(writeAddr, true, dstSize, currentMIPS->pc);
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DEBUG_LOG(LOADER,"Loadable Segment Copied to %08x, size %08x", writeAddr, (u32)p->p_memsz);
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}
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}
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userMemory.ListBlocks();
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DEBUG_LOG(LOADER,"%i sections:", header->e_shnum);
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for (int i = 0; i < GetNumSections(); i++)
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{
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Elf32_Shdr *s = §ions[i];
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const char *name = GetSectionName(i);
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u32 writeAddr = s->sh_addr + baseAddress;
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sectionOffsets[i] = writeAddr - vaddr;
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sectionAddrs[i] = writeAddr;
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if (s->sh_flags & SHF_ALLOC)
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{
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DEBUG_LOG(LOADER,"Data Section found: %s Sitting at %08x, size %08x", name, writeAddr, (u32)s->sh_size);
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}
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else
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{
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DEBUG_LOG(LOADER,"NonData Section found: %s Ignoring (size=%08x) (flags=%08x)", name, (u32)s->sh_size, (u32)s->sh_flags);
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}
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}
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DEBUG_LOG(LOADER,"Relocations:");
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// Second pass: Do necessary relocations
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for (int i = 0; i < GetNumSections(); i++)
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{
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Elf32_Shdr *s = §ions[i];
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const char *name = GetSectionName(i);
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if (s->sh_type == SHT_PSPREL)
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{
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//We have a relocation table!
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int sectionToModify = s->sh_info;
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if (sectionToModify >= 0)
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{
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if (!(sections[sectionToModify].sh_flags & SHF_ALLOC))
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{
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ERROR_LOG_REPORT(LOADER, "Trying to relocate non-loaded section %s", GetSectionName(sectionToModify));
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continue;
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}
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int numRelocs = s->sh_size / sizeof(Elf32_Rel);
|
|
|
|
Elf32_Rel *rels = (Elf32_Rel *)GetSectionDataPtr(i);
|
|
|
|
DEBUG_LOG(LOADER,"%s: Performing %i relocations on %s : offset = %08x", name, numRelocs, GetSectionName(sectionToModify), sections[i].sh_offset);
|
|
if (!LoadRelocations(rels, numRelocs)) {
|
|
WARN_LOG(LOADER, "LoadInto: Relocs failed, trying anyway");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
WARN_LOG_REPORT(LOADER, "sectionToModify = %i - ignoring PSP relocation sector %i", sectionToModify, i);
|
|
}
|
|
}
|
|
else if (s->sh_type == SHT_REL)
|
|
{
|
|
DEBUG_LOG(LOADER, "Traditional relocation section found.");
|
|
if (!bRelocate)
|
|
{
|
|
DEBUG_LOG(LOADER, "Binary is prerelocated. Skipping relocations.");
|
|
}
|
|
else
|
|
{
|
|
//We have a relocation table!
|
|
int sectionToModify = s->sh_info;
|
|
if (sectionToModify >= 0)
|
|
{
|
|
if (!(sections[sectionToModify].sh_flags & SHF_ALLOC))
|
|
{
|
|
ERROR_LOG_REPORT(LOADER, "Trying to relocate non-loaded section %s, ignoring", GetSectionName(sectionToModify));
|
|
continue;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
WARN_LOG_REPORT(LOADER, "sectionToModify = %i - ignoring relocation sector %i", sectionToModify, i);
|
|
}
|
|
ERROR_LOG_REPORT(LOADER, "Traditional relocations unsupported.");
|
|
}
|
|
}
|
|
}
|
|
|
|
// Segment relocations (a few games use them)
|
|
if (GetNumSections() == 0) {
|
|
for (int i = 0; i < header->e_phnum; i++)
|
|
{
|
|
Elf32_Phdr *p = &segments[i];
|
|
if (p->p_type == PT_PSPREL1) {
|
|
INFO_LOG(LOADER,"Loading segment relocations");
|
|
int numRelocs = p->p_filesz / sizeof(Elf32_Rel);
|
|
|
|
Elf32_Rel *rels = (Elf32_Rel *)GetSegmentPtr(i);
|
|
if (!LoadRelocations(rels, numRelocs)) {
|
|
ERROR_LOG(LOADER, "LoadInto: Relocs failed, trying anyway (2)");
|
|
}
|
|
} else if (p->p_type == PT_PSPREL2) {
|
|
INFO_LOG(LOADER,"Loading segment relocations2");
|
|
LoadRelocations2(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
return SCE_KERNEL_ERROR_OK;
|
|
}
|
|
|
|
|
|
SectionID ElfReader::GetSectionByName(const char *name, int firstSection)
|
|
{
|
|
for (int i = firstSection; i < header->e_shnum; i++)
|
|
{
|
|
const char *secname = GetSectionName(i);
|
|
|
|
if (secname != 0 && strcmp(name, secname) == 0)
|
|
{
|
|
return i;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
bool ElfReader::LoadSymbols()
|
|
{
|
|
bool hasSymbols = false;
|
|
SectionID sec = GetSectionByName(".symtab");
|
|
if (sec != -1)
|
|
{
|
|
int stringSection = sections[sec].sh_link;
|
|
|
|
const char *stringBase = (const char*)GetSectionDataPtr(stringSection);
|
|
|
|
//We have a symbol table!
|
|
Elf32_Sym *symtab = (Elf32_Sym *)(GetSectionDataPtr(sec));
|
|
|
|
int numSymbols = sections[sec].sh_size / sizeof(Elf32_Sym);
|
|
|
|
for (int sym = 0; sym<numSymbols; sym++)
|
|
{
|
|
int size = symtab[sym].st_size;
|
|
if (size == 0)
|
|
continue;
|
|
|
|
int bind = symtab[sym].st_info >> 4;
|
|
int type = symtab[sym].st_info & 0xF;
|
|
int sectionIndex = symtab[sym].st_shndx;
|
|
int value = symtab[sym].st_value;
|
|
const char *name = stringBase + symtab[sym].st_name;
|
|
|
|
if (bRelocate)
|
|
value += sectionAddrs[sectionIndex];
|
|
|
|
switch (type)
|
|
{
|
|
case STT_OBJECT:
|
|
symbolMap.AddData(value,size,DATATYPE_BYTE);
|
|
break;
|
|
case STT_FUNC:
|
|
symbolMap.AddFunction(name,value,size);
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
hasSymbols = true;
|
|
//...
|
|
}
|
|
}
|
|
return hasSymbols;
|
|
}
|
|
|
|
|
|
|
|
|