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System: Support sideloading EXE files via BIOS patch

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This commit is contained in:
Connor McLaughlin
2019-09-14 13:22:05 +10:00
parent ae43cc838b
commit 9f36384752
10 changed files with 252 additions and 62 deletions
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25
src/pse/bus.cpp
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@ -2,6 +2,7 @@
#include "YBaseLib/ByteStream.h"
#include "YBaseLib/Log.h"
#include "YBaseLib/String.h"
#include "cpu_disasm.h"
#include "dma.h"
#include "gpu.h"
#include <cstdio>
@ -70,6 +71,24 @@ bool Bus::WriteWord(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus
return DispatchAccess<MemoryAccessType::Write, MemoryAccessSize::Word>(cpu_address, bus_address, value);
}
void Bus::PatchBIOS(u32 address, u32 value, u32 mask /*= UINT32_C(0xFFFFFFFF)*/)
{
const u32 phys_address = address & UINT32_C(0x1FFFFFFF);
const u32 offset = phys_address - BIOS_BASE;
Assert(phys_address >= BIOS_BASE && offset < BIOS_SIZE);
u32 existing_value;
std::memcpy(&existing_value, &m_bios[offset], sizeof(existing_value));
u32 new_value = (existing_value & ~mask) | value;
std::memcpy(&m_bios[offset], &new_value, sizeof(new_value));
SmallString old_disasm, new_disasm;
CPU::DisassembleInstruction(&old_disasm, address, existing_value);
CPU::DisassembleInstruction(&new_disasm, address, new_value);
Log_InfoPrintf("BIOS-Patch 0x%08X (+0x%X): 0x%08X %s -> %08X %s", address, offset, existing_value,
old_disasm.GetCharArray(), new_value, new_disasm.GetCharArray());
}
bool Bus::LoadBIOS()
{
std::FILE* fp = std::fopen("SCPH1001.BIN", "rb");
@ -97,9 +116,9 @@ bool Bus::LoadBIOS()
std::fclose(fp);
#if 1
auto Patch = [this](u32 address, u32 value) { std::memcpy(&m_bios[address], &value, sizeof(value)); };
Patch(0x6F0C, 0x24010001); // addiu $at, $zero, 1
Patch(0x6F14, 0xaf81a9c0); // sw at, -0x5640(gp)
// Patch to enable TTY.
PatchBIOS(BIOS_BASE + 0x6F0C, 0x24010001);
PatchBIOS(BIOS_BASE + 0x6F14, 0xAF81A9C0);
#endif
return true;