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https://github.com/ZDoom/gzdoom-gles.git
synced 2024-11-16 17:41:19 +00:00
- build enough of the unwind opcodes for visual studio's debugger to produce the correct call stack
This commit is contained in:
Magnus Norddahl
drfrag
parent
ea8725f03b
commit
bd1f529574
1 changed files with 189 additions and 33 deletions
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@ -27,7 +27,7 @@ static asmjit::CodeInfo GetHostCodeInfo()
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return codeInfo;
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}
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void *AllocJitMemory(size_t size)
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static void *AllocJitMemory(size_t size)
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{
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using namespace asmjit;
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@ -51,38 +51,184 @@ void *AllocJitMemory(size_t size)
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}
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}
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static TArray<uint32_t> CreateUnwindInfo(asmjit::CCFunc *func)
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#define UWOP_PUSH_NONVOL 0
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#define UWOP_ALLOC_LARGE 1
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#define UWOP_ALLOC_SMALL 2
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#define UWOP_SET_FPREG 3
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#define UWOP_SAVE_NONVOL 4
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#define UWOP_SAVE_NONVOL_FAR 5
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#define UWOP_SAVE_XMM128 8
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#define UWOP_SAVE_XMM128_FAR 9
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#define UWOP_PUSH_MACHFRAME 10
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static TArray<uint16_t> CreateUnwindInfo(asmjit::CCFunc *func)
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{
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TArray<uint32_t> info;
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using namespace asmjit;
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FuncFrameLayout layout;
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Error error = layout.init(func->getDetail(), func->getFrameInfo());
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if (error != kErrorOk)
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I_FatalError("FuncFrameLayout.init failed");
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uint32_t version = 1, flags = 0, sizeOfProlog = 0, countOfCodes = 0, frameRegister = 0, frameOffset = 0;
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// We need a dummy emitter for instruction size calculations
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CodeHolder code;
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code.init(GetHostCodeInfo());
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X86Assembler assembler(&code);
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X86Emitter *emitter = assembler.asEmitter();
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// To do: query FuncFrameLayout to immitate what X86Internal::emitProlog does
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// Build UNWIND_CODE codes:
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info.Push(version | (flags << 3) | (sizeOfProlog << 8) | (countOfCodes << 16) | (frameRegister << 24) | (frameOffset << 28));
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TArray<uint16_t> codes;
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uint32_t opoffset, opcode, opinfo;
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// To do: add UNWIND_CODE entries
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// Note: this must match exactly what X86Internal::emitProlog does
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info[0] |= (countOfCodes << 16);
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X86Gp zsp = emitter->zsp(); // ESP|RSP register.
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X86Gp zbp = emitter->zsp(); // EBP|RBP register.
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zbp.setId(X86Gp::kIdBp);
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X86Gp gpReg = emitter->zsp(); // General purpose register (temporary).
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X86Gp saReg = emitter->zsp(); // Stack-arguments base register.
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uint32_t gpSaved = layout.getSavedRegs(X86Reg::kKindGp);
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/* // For reference, we don't need any of this
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if (flags & UNW_FLAG_EHANDLER)
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if (layout.hasPreservedFP())
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{
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uint32_t exceptionHandler = 0;
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info.Push(exceptionHandler);
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}
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else if (flags & UNW_FLAG_CHAININFO)
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{
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uint32_t functionEntry = 0;
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info.Push(functionEntry);
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// Emit: 'push zbp'
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// 'mov zbp, zsp'.
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gpSaved &= ~Utils::mask(X86Gp::kIdBp);
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emitter->push(zbp);
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_PUSH_NONVOL;
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opinfo = X86Gp::kIdBp;
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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emitter->mov(zbp, zsp);
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}
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if (flags & UNW_FLAG_EHANDLER)
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if (gpSaved)
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{
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uint32_t ExceptionData[];
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info.Push(ExceptionData[]);
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for (uint32_t i = gpSaved, regId = 0; i; i >>= 1, regId++)
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{
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if (!(i & 0x1)) continue;
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// Emit: 'push gp' sequence.
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gpReg.setId(regId);
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emitter->push(gpReg);
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_PUSH_NONVOL;
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opinfo = regId;
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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}
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*/
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uint32_t stackArgsRegId = layout.getStackArgsRegId();
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if (stackArgsRegId != Globals::kInvalidRegId && stackArgsRegId != X86Gp::kIdSp)
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{
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saReg.setId(stackArgsRegId);
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if (!(layout.hasPreservedFP() && stackArgsRegId == X86Gp::kIdBp))
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{
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// Emit: 'mov saReg, zsp'.
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emitter->mov(saReg, zsp);
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}
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}
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if (layout.hasDynamicAlignment())
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{
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// Emit: 'and zsp, StackAlignment'.
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emitter->and_(zsp, -static_cast<int32_t>(layout.getStackAlignment()));
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}
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if (layout.hasStackAdjustment())
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{
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// Emit: 'sub zsp, StackAdjustment'.
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emitter->sub(zsp, layout.getStackAdjustment());
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uint32_t stackadjust = layout.getStackAdjustment();
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if (stackadjust <= 128)
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{
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_ALLOC_SMALL;
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opinfo = stackadjust / 8 - 1;
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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else if (stackadjust <= 512 * 1024 - 8)
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{
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_ALLOC_LARGE;
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opinfo = 0;
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codes.Push(stackadjust / 8);
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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else
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{
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_ALLOC_LARGE;
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opinfo = 1;
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codes.Push((uint16_t)(stackadjust >> 16));
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codes.Push((uint16_t)stackadjust);
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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}
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if (layout.hasDynamicAlignment() && layout.hasDsaSlotUsed())
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{
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// Emit: 'mov [zsp + dsaSlot], saReg'.
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X86Mem saMem = x86::ptr(zsp, layout._dsaSlot);
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emitter->mov(saMem, saReg);
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}
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uint32_t xmmSaved = layout.getSavedRegs(X86Reg::kKindVec);
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if (xmmSaved)
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{
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X86Mem vecBase = x86::ptr(zsp, layout.getVecStackOffset());
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X86Reg vecReg = x86::xmm(0);
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bool avx = layout.isAvxEnabled();
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bool aligned = layout.hasAlignedVecSR();
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uint32_t vecInst = aligned ? (avx ? X86Inst::kIdVmovaps : X86Inst::kIdMovaps) : (avx ? X86Inst::kIdVmovups : X86Inst::kIdMovups);
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uint32_t vecSize = 16;
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for (uint32_t i = xmmSaved, regId = 0; i; i >>= 1, regId++)
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{
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if (!(i & 0x1)) continue;
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// Emit 'movaps|movups [zsp + X], xmm0..15'.
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vecReg.setId(regId);
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emitter->emit(vecInst, vecBase, vecReg);
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vecBase.addOffsetLo32(static_cast<int32_t>(vecSize));
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if (vecBase.getOffsetLo32() / vecSize < (1 << 16))
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{
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_SAVE_XMM128;
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opinfo = regId;
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codes.Push(vecBase.getOffsetLo32() / vecSize);
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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else
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{
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opoffset = (uint32_t)assembler.getOffset();
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opcode = UWOP_SAVE_XMM128_FAR;
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opinfo = regId;
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codes.Push((uint16_t)(vecBase.getOffsetLo32() << 16));
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codes.Push((uint16_t)vecBase.getOffsetLo32());
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codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
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}
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}
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}
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// Build the UNWIND_INFO structure:
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uint16_t version = 1, flags = 0, frameRegister = 0, frameOffset = 0;
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uint16_t sizeOfProlog = (uint16_t)assembler.getOffset();
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uint16_t countOfCodes = (uint16_t)codes.Size();
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TArray<uint16_t> info;
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info.Push(version | (flags << 3) | (sizeOfProlog << 8));
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info.Push(countOfCodes | (frameRegister << 8) | (frameOffset << 12));
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for (unsigned int i = codes.Size(); i > 0; i--)
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info.Push(codes[i - 1]);
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if (codes.Size() % 2 == 1)
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info.Push(0);
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return info;
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}
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@ -95,12 +241,18 @@ static void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
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if (codeSize == 0)
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return nullptr;
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TArray<uint32_t> unwindInfo = CreateUnwindInfo(func);
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size_t unwindInfoSize = unwindInfo.Size() * sizeof(uint32_t);
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#ifdef WIN32
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TArray<uint16_t> unwindInfo = CreateUnwindInfo(func);
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size_t unwindInfoSize = unwindInfo.Size() * sizeof(uint16_t);
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size_t functionTableSize = sizeof(RUNTIME_FUNCTION);
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#else
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size_t unwindInfoSize = 0;
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size_t functionTableSize = 0;
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#endif
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codeSize = (codeSize + 3) / 4 * 4;
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codeSize = (codeSize + 15) / 16 * 16;
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uint8_t *p = (uint8_t *)AllocJitMemory(codeSize + unwindInfoSize);
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uint8_t *p = (uint8_t *)AllocJitMemory(codeSize + unwindInfoSize + functionTableSize);
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if (!p)
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return nullptr;
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@ -108,18 +260,22 @@ static void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
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if (relocSize == 0)
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return nullptr;
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relocSize = (relocSize + 3) / 4 * 4;
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JitBlockPos -= codeSize - relocSize;
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size_t unwindStart = relocSize;
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unwindStart = (unwindStart + 15) / 16 * 16;
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JitBlockPos -= codeSize - unwindStart;
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#ifdef WIN32
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uint8_t *unwindptr = p + relocSize;
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uint8_t *baseaddr = JitBlocks.Last();
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uint8_t *startaddr = p;
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uint8_t *endaddr = p + relocSize;
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uint8_t *unwindptr = p + unwindStart;
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memcpy(unwindptr, &unwindInfo[0], unwindInfoSize);
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RUNTIME_FUNCTION table;
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table.BeginAddress = 0;
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table.EndAddress = (DWORD)(ptrdiff_t)(unwindptr - p);
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table.UnwindData = (DWORD)(ptrdiff_t)(unwindptr - p);
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BOOLEAN result = RtlAddFunctionTable(&table, 1, (DWORD64)p);
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RUNTIME_FUNCTION *table = (RUNTIME_FUNCTION*)(unwindptr + unwindInfoSize);
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table[0].BeginAddress = (DWORD)(ptrdiff_t)(startaddr - baseaddr);
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table[0].EndAddress = (DWORD)(ptrdiff_t)(endaddr - baseaddr);
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table[0].UnwindInfoAddress = (DWORD)(ptrdiff_t)(unwindptr - baseaddr);
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BOOLEAN result = RtlAddFunctionTable(table, 1, (DWORD64)baseaddr);
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if (result == 0)
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I_FatalError("RtlAddFunctionTable failed");
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#endif
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