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- build enough of the unwind opcodes for visual studio's debugger to produce the correct call stack

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This commit is contained in:
Magnus Norddahl 2018-10-14 08:27:27 +02:00
parent cf9bae67a8
commit a3f6950a4f
1 changed files with 189 additions and 33 deletions
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222
src/scripting/vm/jit.cpp
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@ -27,7 +27,7 @@ static asmjit::CodeInfo GetHostCodeInfo()
return codeInfo;
}
void *AllocJitMemory(size_t size)
static void *AllocJitMemory(size_t size)
{
using namespace asmjit;
@ -51,38 +51,184 @@ void *AllocJitMemory(size_t size)
}
}
static TArray<uint32_t> CreateUnwindInfo(asmjit::CCFunc *func)
#define UWOP_PUSH_NONVOL 0
#define UWOP_ALLOC_LARGE 1
#define UWOP_ALLOC_SMALL 2
#define UWOP_SET_FPREG 3
#define UWOP_SAVE_NONVOL 4
#define UWOP_SAVE_NONVOL_FAR 5
#define UWOP_SAVE_XMM128 8
#define UWOP_SAVE_XMM128_FAR 9
#define UWOP_PUSH_MACHFRAME 10
static TArray<uint16_t> CreateUnwindInfo(asmjit::CCFunc *func)
{
TArray<uint32_t> info;
using namespace asmjit;
FuncFrameLayout layout;
Error error = layout.init(func->getDetail(), func->getFrameInfo());
if (error != kErrorOk)
I_FatalError("FuncFrameLayout.init failed");
uint32_t version = 1, flags = 0, sizeOfProlog = 0, countOfCodes = 0, frameRegister = 0, frameOffset = 0;
// We need a dummy emitter for instruction size calculations
CodeHolder code;
code.init(GetHostCodeInfo());
X86Assembler assembler(&code);
X86Emitter *emitter = assembler.asEmitter();
// To do: query FuncFrameLayout to immitate what X86Internal::emitProlog does
// Build UNWIND_CODE codes:
info.Push(version | (flags << 3) | (sizeOfProlog << 8) | (countOfCodes << 16) | (frameRegister << 24) | (frameOffset << 28));
TArray<uint16_t> codes;
uint32_t opoffset, opcode, opinfo;
// To do: add UNWIND_CODE entries
// Note: this must match exactly what X86Internal::emitProlog does
info[0] |= (countOfCodes << 16);
X86Gp zsp = emitter->zsp(); // ESP|RSP register.
X86Gp zbp = emitter->zsp(); // EBP|RBP register.
zbp.setId(X86Gp::kIdBp);
X86Gp gpReg = emitter->zsp(); // General purpose register (temporary).
X86Gp saReg = emitter->zsp(); // Stack-arguments base register.
uint32_t gpSaved = layout.getSavedRegs(X86Reg::kKindGp);
/* // For reference, we don't need any of this
if (flags & UNW_FLAG_EHANDLER)
if (layout.hasPreservedFP())
{
uint32_t exceptionHandler = 0;
info.Push(exceptionHandler);
}
else if (flags & UNW_FLAG_CHAININFO)
{
uint32_t functionEntry = 0;
info.Push(functionEntry);
// Emit: 'push zbp'
// 'mov zbp, zsp'.
gpSaved &= ~Utils::mask(X86Gp::kIdBp);
emitter->push(zbp);
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_PUSH_NONVOL;
opinfo = X86Gp::kIdBp;
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
emitter->mov(zbp, zsp);
}
if (flags & UNW_FLAG_EHANDLER)
if (gpSaved)
{
uint32_t ExceptionData[];
info.Push(ExceptionData[]);
for (uint32_t i = gpSaved, regId = 0; i; i >>= 1, regId++)
{
if (!(i & 0x1)) continue;
// Emit: 'push gp' sequence.
gpReg.setId(regId);
emitter->push(gpReg);
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_PUSH_NONVOL;
opinfo = regId;
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
}
*/
uint32_t stackArgsRegId = layout.getStackArgsRegId();
if (stackArgsRegId != Globals::kInvalidRegId && stackArgsRegId != X86Gp::kIdSp)
{
saReg.setId(stackArgsRegId);
if (!(layout.hasPreservedFP() && stackArgsRegId == X86Gp::kIdBp))
{
// Emit: 'mov saReg, zsp'.
emitter->mov(saReg, zsp);
}
}
if (layout.hasDynamicAlignment())
{
// Emit: 'and zsp, StackAlignment'.
emitter->and_(zsp, -static_cast<int32_t>(layout.getStackAlignment()));
}
if (layout.hasStackAdjustment())
{
// Emit: 'sub zsp, StackAdjustment'.
emitter->sub(zsp, layout.getStackAdjustment());
uint32_t stackadjust = layout.getStackAdjustment();
if (stackadjust <= 128)
{
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_ALLOC_SMALL;
opinfo = stackadjust / 8 - 1;
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
else if (stackadjust <= 512 * 1024 - 8)
{
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_ALLOC_LARGE;
opinfo = 0;
codes.Push(stackadjust / 8);
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
else
{
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_ALLOC_LARGE;
opinfo = 1;
codes.Push((uint16_t)(stackadjust >> 16));
codes.Push((uint16_t)stackadjust);
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
}
if (layout.hasDynamicAlignment() && layout.hasDsaSlotUsed())
{
// Emit: 'mov [zsp + dsaSlot], saReg'.
X86Mem saMem = x86::ptr(zsp, layout._dsaSlot);
emitter->mov(saMem, saReg);
}
uint32_t xmmSaved = layout.getSavedRegs(X86Reg::kKindVec);
if (xmmSaved)
{
X86Mem vecBase = x86::ptr(zsp, layout.getVecStackOffset());
X86Reg vecReg = x86::xmm(0);
bool avx = layout.isAvxEnabled();
bool aligned = layout.hasAlignedVecSR();
uint32_t vecInst = aligned ? (avx ? X86Inst::kIdVmovaps : X86Inst::kIdMovaps) : (avx ? X86Inst::kIdVmovups : X86Inst::kIdMovups);
uint32_t vecSize = 16;
for (uint32_t i = xmmSaved, regId = 0; i; i >>= 1, regId++)
{
if (!(i & 0x1)) continue;
// Emit 'movaps|movups [zsp + X], xmm0..15'.
vecReg.setId(regId);
emitter->emit(vecInst, vecBase, vecReg);
vecBase.addOffsetLo32(static_cast<int32_t>(vecSize));
if (vecBase.getOffsetLo32() / vecSize < (1 << 16))
{
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_SAVE_XMM128;
opinfo = regId;
codes.Push(vecBase.getOffsetLo32() / vecSize);
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
else
{
opoffset = (uint32_t)assembler.getOffset();
opcode = UWOP_SAVE_XMM128_FAR;
opinfo = regId;
codes.Push((uint16_t)(vecBase.getOffsetLo32() << 16));
codes.Push((uint16_t)vecBase.getOffsetLo32());
codes.Push(opoffset | (opcode << 8) | (opinfo << 12));
}
}
}
// Build the UNWIND_INFO structure:
uint16_t version = 1, flags = 0, frameRegister = 0, frameOffset = 0;
uint16_t sizeOfProlog = (uint16_t)assembler.getOffset();
uint16_t countOfCodes = (uint16_t)codes.Size();
TArray<uint16_t> info;
info.Push(version | (flags << 3) | (sizeOfProlog << 8));
info.Push(countOfCodes | (frameRegister << 8) | (frameOffset << 12));
for (unsigned int i = codes.Size(); i > 0; i--)
info.Push(codes[i - 1]);
if (codes.Size() % 2 == 1)
info.Push(0);
return info;
}
@ -95,12 +241,18 @@ static void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
if (codeSize == 0)
return nullptr;
TArray<uint32_t> unwindInfo = CreateUnwindInfo(func);
size_t unwindInfoSize = unwindInfo.Size() * sizeof(uint32_t);
#ifdef WIN32
TArray<uint16_t> unwindInfo = CreateUnwindInfo(func);
size_t unwindInfoSize = unwindInfo.Size() * sizeof(uint16_t);
size_t functionTableSize = sizeof(RUNTIME_FUNCTION);
#else
size_t unwindInfoSize = 0;
size_t functionTableSize = 0;
#endif
codeSize = (codeSize + 3) / 4 * 4;
codeSize = (codeSize + 15) / 16 * 16;
uint8_t *p = (uint8_t *)AllocJitMemory(codeSize + unwindInfoSize);
uint8_t *p = (uint8_t *)AllocJitMemory(codeSize + unwindInfoSize + functionTableSize);
if (!p)
return nullptr;
@ -108,18 +260,22 @@ static void *AddJitFunction(asmjit::CodeHolder* code, asmjit::CCFunc *func)
if (relocSize == 0)
return nullptr;
relocSize = (relocSize + 3) / 4 * 4;
JitBlockPos -= codeSize - relocSize;
size_t unwindStart = relocSize;
unwindStart = (unwindStart + 15) / 16 * 16;
JitBlockPos -= codeSize - unwindStart;
#ifdef WIN32
uint8_t *unwindptr = p + relocSize;
uint8_t *baseaddr = JitBlocks.Last();
uint8_t *startaddr = p;
uint8_t *endaddr = p + relocSize;
uint8_t *unwindptr = p + unwindStart;
memcpy(unwindptr, &unwindInfo[0], unwindInfoSize);
RUNTIME_FUNCTION table;
table.BeginAddress = 0;
table.EndAddress = (DWORD)(ptrdiff_t)(unwindptr - p);
table.UnwindData = (DWORD)(ptrdiff_t)(unwindptr - p);
BOOLEAN result = RtlAddFunctionTable(&table, 1, (DWORD64)p);
RUNTIME_FUNCTION *table = (RUNTIME_FUNCTION*)(unwindptr + unwindInfoSize);
table[0].BeginAddress = (DWORD)(ptrdiff_t)(startaddr - baseaddr);
table[0].EndAddress = (DWORD)(ptrdiff_t)(endaddr - baseaddr);
table[0].UnwindInfoAddress = (DWORD)(ptrdiff_t)(unwindptr - baseaddr);
BOOLEAN result = RtlAddFunctionTable(table, 1, (DWORD64)baseaddr);
if (result == 0)
I_FatalError("RtlAddFunctionTable failed");
#endif