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Exception handling fix
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Nekotekina
parent
6627cc9666
commit
6545df2b15
@ -192,81 +192,112 @@ void decode_x64_reg_op(const u8* code, x64_op_t& decoded_op, x64_reg_t& decoded_
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#ifdef _WIN32
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typedef CONTEXT x64_context;
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#define RIP 16
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#define X64REG(context, reg) ((&context->Rax)[reg])
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#else
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typedef ucontext_t x64_context;
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typedef decltype(REG_RIP) reg_table_t;
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#define RIP 16
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static const reg_table_t reg_table[17] =
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{
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REG_RAX, REG_RCX, REG_RDX, REG_RBX, REG_RSP, REG_RBP, REG_RSI, REG_RDI,
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REG_R8, REG_R9, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15, REG_RIP
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};
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#define X64REG(context, reg) (context->uc_mcontext.gregs[reg_table[reg]])
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#endif
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bool handle_access_violation(const u32 addr, x64_context* context)
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{
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if (addr - RAW_SPU_BASE_ADDR < (6 * RAW_SPU_OFFSET) && (addr % RAW_SPU_OFFSET) >= RAW_SPU_PROB_OFFSET) // RawSPU MMIO registers
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{
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// one x64 instruction is manually decoded and interpreted
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x64_op_t op;
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x64_reg_t reg;
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size_t size;
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decode_x64_reg_op((const u8*)X64REG(context, RIP), op, reg, size);
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// get x64 reg value (for store operations)
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u64 reg_value;
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if (reg - X64R32 < 16)
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{
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// load the value from x64 register
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reg_value = (u32)X64REG(context, reg - X64R32);
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}
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else if (reg == X64_IMM32)
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{
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// load the immediate value (assuming it's at the end of the instruction)
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reg_value = *(u32*)(X64REG(context, RIP) + size - 4);
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}
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else
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{
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assert(!"Invalid x64_reg_t value");
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}
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bool save_reg = false;
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switch (op)
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{
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case X64OP_LOAD:
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{
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reg_value = re32(Memory.ReadMMIO32(addr));
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save_reg = true;
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break;
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}
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case X64OP_STORE:
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{
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Memory.WriteMMIO32(addr, re32((u32)reg_value));
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break;
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}
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default: assert(!"Invalid x64_op_t value");
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}
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// save x64 reg value (for load operations)
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if (save_reg)
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{
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if (reg - X64R32 < 16)
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{
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// store the value into x64 register
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X64REG(context, reg - X64R32) = (u32)reg_value;
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}
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else
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{
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assert(!"Invalid x64_reg_t value (saving)");
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}
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}
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// skip decoded instruction
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X64REG(context, RIP) += size;
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return true;
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}
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// TODO: allow recovering from a page fault as a feature of PS3 virtual memory
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return false;
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}
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#ifdef _WIN32
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void _se_translator(unsigned int u, EXCEPTION_POINTERS* pExp)
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{
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const u64 addr64 = (u64)pExp->ExceptionRecord->ExceptionInformation[1] - (u64)Memory.GetBaseAddr();
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const bool is_writing = pExp->ExceptionRecord->ExceptionInformation[0] != 0;
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if (u == EXCEPTION_ACCESS_VIOLATION && addr64 < 0x100000000ull)
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if (u == EXCEPTION_ACCESS_VIOLATION && (u32)addr64 == addr64)
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{
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const u32 addr = (u32)addr64;
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if (addr - RAW_SPU_BASE_ADDR < (6 * RAW_SPU_OFFSET) && (addr % RAW_SPU_OFFSET) >= RAW_SPU_PROB_OFFSET) // RawSPU MMIO registers
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if (handle_access_violation((u32)addr64, pExp->ContextRecord))
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{
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// one x64 instruction is manually decoded and interpreted
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x64_op_t op;
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x64_reg_t reg;
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size_t size;
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decode_x64_reg_op((const u8*)pExp->ContextRecord->Rip, op, reg, size);
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// get x64 reg value (for store operations)
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u64 reg_value;
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if (reg - X64R32 < 16)
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{
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// load the value from x64 register
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reg_value = (u32)(&pExp->ContextRecord->Rax)[reg - X64R32];
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}
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else if (reg == X64_IMM32)
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{
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// load the immediate value (assuming it's at the end of the instruction)
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reg_value = *(u32*)(pExp->ContextRecord->Rip + size - 4);
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}
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else
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{
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assert(!"Invalid x64_reg_t value");
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}
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bool save_reg = false;
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switch (op)
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{
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case X64OP_LOAD:
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{
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assert(!is_writing);
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reg_value = re32(Memory.ReadMMIO32(addr));
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save_reg = true;
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break;
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}
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case X64OP_STORE:
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{
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assert(is_writing);
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Memory.WriteMMIO32(addr, re32((u32)reg_value));
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break;
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}
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default: assert(!"Invalid x64_op_t value");
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}
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// save x64 reg value (for load operations)
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if (save_reg)
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{
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if (reg - X64R32 < 16)
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{
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// store the value into x64 register
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(&pExp->ContextRecord->Rax)[reg - X64R32] = (u32)reg_value;
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}
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else
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{
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assert(!"Invalid x64_reg_t value (saving)");
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}
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}
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// skip decoded instruction
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pExp->ContextRecord->Rip += size;
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// restore context (further code shouldn't be reached)
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RtlRestoreContext(pExp->ContextRecord, nullptr);
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// it's dangerous because destructors won't be executed
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}
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// TODO: allow recovering from a page fault as a feature of PS3 virtual memory
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throw fmt::Format("Access violation %s location 0x%x", is_writing ? "writing" : "reading", addr);
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throw fmt::Format("Access violation %s location 0x%llx", is_writing ? "writing" : "reading", addr64);
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}
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// else some fatal error (should crash)
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@ -283,79 +314,15 @@ static const reg_table_t reg_table[16] =
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void signal_handler(int sig, siginfo_t* info, void* uct)
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{
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ucontext_t* const ctx = (ucontext_t*)uct;
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const u64 addr64 = (u64)info->si_addr - (u64)Memory.GetBaseAddr();
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//const bool is_writing = false; // TODO: get it correctly
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if (addr64 < 0x100000000ull && GetCurrentNamedThread())
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if ((u32)addr64 == addr64 && GetCurrentNamedThread())
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{
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const u32 addr = (u32)addr64;
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if (addr - RAW_SPU_BASE_ADDR < (6 * RAW_SPU_OFFSET) && (addr % RAW_SPU_OFFSET) >= RAW_SPU_PROB_OFFSET) // RawSPU MMIO registers
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if (handle_access_violation((u32)addr64, (ucontext_t*)uct))
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{
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// one x64 instruction is manually decoded and interpreted
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x64_op_t op;
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x64_reg_t reg;
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size_t size;
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decode_x64_reg_op((const u8*)ctx->uc_mcontext.gregs[REG_RIP], op, reg, size);
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// get x64 reg value (for store operations)
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u64 reg_value;
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if (reg - X64R32 < 16)
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{
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// load the value from x64 register
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reg_value = (u32)ctx->uc_mcontext.gregs[reg_table[reg - X64R32]];
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}
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else if (reg == X64_IMM32)
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{
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// load the immediate value (assuming it's at the end of the instruction)
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reg_value = *(u32*)(ctx->uc_mcontext.gregs[REG_RIP] + size - 4);
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}
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else
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{
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assert(!"Invalid x64_reg_t value");
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}
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bool save_reg = false;
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switch (op)
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{
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case X64OP_LOAD:
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{
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//assert(!is_writing);
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reg_value = re32(Memory.ReadMMIO32(addr));
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save_reg = true;
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break;
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}
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case X64OP_STORE:
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{
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//assert(is_writing);
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Memory.WriteMMIO32(addr, re32((u32)reg_value));
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break;
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}
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default: assert(!"Invalid x64_op_t value");
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}
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// save x64 reg value (for load operations)
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if (save_reg)
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{
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if (reg - X64R32 < 16)
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{
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// store the value into x64 register
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ctx->uc_mcontext.gregs[reg_table[reg - X64R32]] = (u32)reg_value;
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}
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else
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{
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assert(!"Invalid x64_reg_t value (saving)");
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}
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}
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// skip decoded instruction
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ctx->uc_mcontext.gregs[REG_RIP] += size;
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return; // now execution should proceed
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//setcontext(ctx);
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return; // proceed execution
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}
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// TODO: allow recovering from a page fault as a feature of PS3 virtual memory
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// TODO: this may be wrong
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throw fmt::Format("Access violation %s location 0x%x", /*is_writing ? "writing" : "reading"*/ "at", addr);
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}
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@ -1067,5 +1067,5 @@ void cellAudio_init(Module *pxThis)
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void cellAudio_load()
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{
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// never called :(
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// CELL_SYSMODULE AUDIO module is rarely loaded manually, so cellAudio_load() won't be called in every case
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}
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