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- unwind data is now working on macOS

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This commit is contained in:
Magnus Norddahl 2018-12-01 12:46:35 +01:00 committed by drfrag
parent 56228a853b
commit 4393684831
1 changed files with 24 additions and 24 deletions
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46
src/scripting/vm/jit_runtime.cpp
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@ -410,7 +410,7 @@ static void WritePadding(TArray<uint8_t> &stream)
if (padding != 0)
{
padding = 8 - padding;
for (int i = 0; i <= padding; i++) WriteUInt8(stream, 0);
for (int i = 0; i < padding; i++) WriteUInt8(stream, 0);
}
}
@ -421,20 +421,17 @@ static void WriteCIE(TArray<uint8_t> &stream, const TArray<uint8_t> &cieInstruct
WriteUInt32(stream, 0); // CIE ID
WriteUInt8(stream, 1); // CIE Version
//WriteUInt8(stream, 'z');
WriteUInt8(stream, 'z');
//WriteUInt8(stream, 'L'); // LSDA (language specific data area)
//WriteUInt8(stream, 'R'); // fde encoding
WriteUInt8(stream, 'R'); // fde encoding
WriteUInt8(stream, 0);
WriteULEB128(stream, 1);
WriteSLEB128(stream, -1);
WriteULEB128(stream, returnAddressReg);
//unsigned int augmentStartPos = stream.Size();
//WriteULEB128(stream, 0); // LEB128 augmentation size
WriteULEB128(stream, 2); // LEB128 augmentation size
//WriteUInt8(stream, 0xff); // DW_EH_PE_omit (no LSDA)
//WriteUInt8(stream, 0); // DW_EH_PE_absptr (FDE uses absolute pointers)
//WritePadding(stream);
//stream[augmentStartPos] = stream.Size() - augmentStartPos - 1;
WriteUInt8(stream, 0); // DW_EH_PE_absptr (FDE uses absolute pointers)
for (unsigned int i = 0; i < cieInstructions.Size(); i++)
stream.Push(cieInstructions[i]);
@ -454,10 +451,7 @@ static void WriteFDE(TArray<uint8_t> &stream, const TArray<uint8_t> &fdeInstruct
WriteUInt64(stream, 0); // func start
WriteUInt64(stream, 0); // func size
//unsigned int augmentStartPos = stream.Size();
//WriteULEB128(stream, 0); // LEB128 augmentation size
//WritePadding(stream);
//stream[augmentStartPos] = stream.Size() - augmentStartPos - 1;
WriteULEB128(stream, 0); // LEB128 augmentation size
for (unsigned int i = 0; i < fdeInstructions.Size(); i++)
stream.Push(fdeInstructions[i]);
@ -469,7 +463,11 @@ static void WriteFDE(TArray<uint8_t> &stream, const TArray<uint8_t> &fdeInstruct
static void WriteAdvanceLoc(TArray<uint8_t> &fdeInstructions, uint64_t offset, uint64_t &lastOffset)
{
uint64_t delta = offset - lastOffset;
if (delta < (1 << 8))
if (delta < (1 << 6))
{
WriteUInt8(fdeInstructions, (1 << 6) | delta); // DW_CFA_advance_loc
}
else if (delta < (1 << 8))
{
WriteUInt8(fdeInstructions, 2); // DW_CFA_advance_loc1
WriteUInt8(fdeInstructions, delta);
@ -526,7 +524,6 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
TArray<uint8_t> cieInstructions;
TArray<uint8_t> fdeInstructions;
uint64_t lastOffset = 0;
uint8_t returnAddressReg = dwarfRegRAId;
int stackOffset = 8; // Offset from RSP to the Canonical Frame Address (CFA) - stack position where the CALL return address is stored
@ -540,8 +537,9 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
WriteULEB128(cieInstructions, stackOffset);
WriteUInt8(cieInstructions, (2 << 6) | returnAddressReg); // DW_CFA_offset
WriteULEB128(cieInstructions, 0);
WriteULEB128(cieInstructions, stackOffset);
/* clang doesn't output this, so I guess those were the defaults..
for (auto regId : { X86Gp::kIdAx, X86Gp::kIdDx, X86Gp::kIdCx, X86Gp::kIdSi, X86Gp::kIdDi, X86Gp::kIdSp, X86Gp::kIdR8, X86Gp::kIdR9, X86Gp::kIdR10, X86Gp::kIdR11 })
{
WriteUInt8(cieInstructions, 0x07); // DW_CFA_undefined
@ -553,6 +551,7 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
WriteUInt8(cieInstructions, 0x08); // DW_CFA_same_value
WriteULEB128(cieInstructions, dwarfRegId[regId]);
}
*/
FuncFrameLayout layout;
Error error = layout.init(func->getDetail(), func->getFrameInfo());
@ -564,6 +563,7 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
code.init(GetHostCodeInfo());
X86Assembler assembler(&code);
X86Emitter *emitter = assembler.asEmitter();
uint64_t lastOffset = 0;
// Note: the following code must match exactly what X86Internal::emitProlog does
@ -581,12 +581,12 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
gpSaved &= ~Utils::mask(X86Gp::kIdBp);
emitter->push(zbp);
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
stackOffset += 8;
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
WriteULEB128(fdeInstructions, stackOffset);
WriteUInt8(fdeInstructions, (2 << 6) | dwarfRegId[X86Gp::kIdBp]); // DW_CFA_offset
WriteULEB128(fdeInstructions, stackOffset - 8);
WriteULEB128(fdeInstructions, stackOffset);
emitter->mov(zbp, zsp);
}
@ -600,12 +600,12 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
gpReg.setId(regId);
emitter->push(gpReg);
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
stackOffset += 8;
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
WriteULEB128(fdeInstructions, stackOffset);
WriteUInt8(fdeInstructions, (2 << 6) | dwarfRegId[regId]); // DW_CFA_offset
WriteULEB128(fdeInstructions, stackOffset - 8);
WriteULEB128(fdeInstructions, stackOffset);
}
}
@ -631,8 +631,8 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
// Emit: 'sub zsp, StackAdjustment'.
emitter->sub(zsp, layout.getStackAdjustment());
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
stackOffset += layout.getStackAdjustment();
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
WriteUInt8(fdeInstructions, 0x0e); // DW_CFA_def_cfa_offset
WriteULEB128(fdeInstructions, stackOffset);
}
@ -647,7 +647,7 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
uint32_t xmmSaved = layout.getSavedRegs(X86Reg::kKindVec);
if (xmmSaved)
{
stackOffset += layout.getVecStackOffset();
int vecOffset = layout.getVecStackOffset();
X86Mem vecBase = x86::ptr(zsp, layout.getVecStackOffset());
X86Reg vecReg = x86::xmm(0);
bool avx = layout.isAvxEnabled();
@ -665,8 +665,8 @@ static TArray<uint8_t> CreateUnwindInfoUnix(asmjit::CCFunc *func, unsigned int &
WriteAdvanceLoc(fdeInstructions, assembler.getOffset(), lastOffset);
WriteUInt8(fdeInstructions, (2 << 6) | (dwarfRegXmmId + regId)); // DW_CFA_offset
WriteULEB128(fdeInstructions, stackOffset);
stackOffset += 8;
WriteULEB128(fdeInstructions, stackOffset - vecOffset);
vecOffset += static_cast<int32_t>(vecSize);
}
}