//------------------------------------------------------------------------
// Compiler::unwindSetFrameRegCFI: Record a cfi info for a frame register set.
//
// Arguments:
// reg - The register being set as the frame register.
// offset - The offset from the current stack pointer that the frame pointer will point at.
//
void Compiler::unwindSetFrameRegCFI(regNumber reg, unsigned offset)
{
#if defined(_TARGET_ARM_)
assert(compGeneratingEpilog);
#else
assert(compGeneratingProlog);
#endif
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = 0;
if (compGeneratingProlog)
{
cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
}
createCfiCode(func, cbProlog, CFI_DEF_CFA_REGISTER, mapRegNumToDwarfReg(reg));
if (offset != 0)
{
// before: cfa = rsp + old_cfa_offset;
// rbp = rsp + offset;
// after: cfa should be based on rbp, but points to the old address:
// rsp + old_cfa_offset == rbp + old_cfa_offset + adjust;
// adjust = -offset;
int adjust = -(int)offset;
createCfiCode(func, cbProlog, CFI_ADJUST_CFA_OFFSET, DWARF_REG_ILLEGAL, adjust);
}
}
//------------------------------------------------------------------------
// Compiler::unwindPush: Record a push/save of a register.
//
// Arguments:
// reg - The register being pushed/saved.
//
void Compiler::unwindPush(regNumber reg)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
assert(func->unwindHeader.Version == 1); // Can't call this before unwindBegProlog
assert(func->unwindHeader.CountOfUnwindCodes == 0); // Can't call this after unwindReserve
assert(func->unwindCodeSlot > sizeof(UNWIND_CODE));
UNWIND_CODE * code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
code->CodeOffset = (BYTE)cbProlog;
if ((RBM_CALLEE_SAVED & genRegMask(reg))
#if ETW_EBP_FRAMED
// In case of ETW_EBP_FRAMED defined the REG_FPBASE (RBP)
// is excluded from the callee-save register list.
// Make sure the register gets PUSH unwind info in this case,
// since it is pushed as a frame register.
|| (reg == REG_FPBASE)
#endif // ETW_EBP_FRAMED
)
{
code->UnwindOp = UWOP_PUSH_NONVOL;
code->OpInfo = (BYTE)reg;
}
else
{
// Push of a volatile register is just a small stack allocation
code->UnwindOp = UWOP_ALLOC_SMALL;
code->OpInfo = 0;
}
}
void Compiler::unwindPushPopCFI(regNumber reg)
{
#if defined(_TARGET_ARM_)
assert(compGeneratingEpilog);
#else
assert(compGeneratingProlog);
#endif
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = 0;
if (compGeneratingProlog)
{
cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
createCfiCode(func, cbProlog, CFI_ADJUST_CFA_OFFSET, DWARF_REG_ILLEGAL, REGSIZE_BYTES == 8 ? 8 : 4);
}
if ((RBM_CALLEE_SAVED & genRegMask(reg))
#if defined(UNIX_AMD64_ABI)
#if ETW_EBP_FRAMED
// In case of ETW_EBP_FRAMED defined the REG_FPBASE (RBP)
// is excluded from the callee-save register list.
// Make sure the register gets PUSH unwind info in this case,
// since it is pushed as a frame register.
|| (reg == REG_FPBASE)
#endif // ETW_EBP_FRAMED
#endif
)
{
createCfiCode(func, cbProlog, CFI_REL_OFFSET, mapRegNumToDwarfReg(reg));
}
}
void Compiler::unwindAllocStackCFI(unsigned size)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
createCfiCode(func, cbProlog, CFI_ADJUST_CFA_OFFSET, DWARF_REG_ILLEGAL, size);
}
void Compiler::unwindSaveRegCFI(regNumber reg, unsigned offset)
{
assert(compGeneratingProlog);
if (RBM_CALLEE_SAVED & genRegMask(reg))
{
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
createCfiCode(func, cbProlog, CFI_REL_OFFSET, mapRegNumToDwarfReg(reg), offset);
}
}
void Compiler::unwindSetFrameRegCFI(regNumber reg, unsigned offset)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
createCfiCode(func, cbProlog, CFI_DEF_CFA_REGISTER, mapRegNumToDwarfReg(reg));
if (offset != 0)
{
createCfiCode(func, cbProlog, CFI_ADJUST_CFA_OFFSET, DWARF_REG_ILLEGAL, offset);
}
}
void Compiler::unwindAllocStackCFI(unsigned size)
{
#if defined(_TARGET_ARM_)
assert(compGeneratingEpilog);
#else
assert(compGeneratingProlog);
#endif
FuncInfoDsc* func = funCurrentFunc();
unsigned int cbProlog = 0;
if (compGeneratingProlog)
{
cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
}
createCfiCode(func, cbProlog, CFI_ADJUST_CFA_OFFSET, DWARF_REG_ILLEGAL, size);
}
//------------------------------------------------------------------------
// Compiler::unwindSaveReg: Record a register save.
//
// Arguments:
// reg - The register being saved.
// offset - The offset from the current stack pointer where the register is being saved.
//
void Compiler::unwindSaveReg(regNumber reg, unsigned offset)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
assert(func->unwindHeader.Version == 1); // Can't call this before unwindBegProlog
assert(func->unwindHeader.CountOfUnwindCodes == 0); // Can't call this after unwindReserve
if (RBM_CALLEE_SAVED & genRegMask(reg))
{
UNWIND_CODE * code;
if (offset < 0x80000)
{
assert(func->unwindCodeSlot > (sizeof(UNWIND_CODE) + sizeof(USHORT)));
USHORT * codedSize = (USHORT*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(USHORT)];
code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
// As per AMD64 ABI, if saving entire xmm reg, then offset need to be scaled by 16.
if (genIsValidFloatReg(reg))
{
*codedSize = (USHORT) (offset/16);
code->UnwindOp = UWOP_SAVE_XMM128;
}
else
{
*codedSize = (USHORT) (offset/8);
code->UnwindOp = UWOP_SAVE_NONVOL;
}
}
else
{
assert(func->unwindCodeSlot > (sizeof(UNWIND_CODE) + sizeof(ULONG)));
ULONG * codedSize = (ULONG*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(ULONG)];
*codedSize = offset;
code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
code->UnwindOp = (genIsValidFloatReg(reg)) ? UWOP_SAVE_XMM128_FAR : UWOP_SAVE_NONVOL_FAR;
}
code->OpInfo = (BYTE)reg;
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
code->CodeOffset = (BYTE)cbProlog;
}
}
//------------------------------------------------------------------------
// Compiler::unwindSetFrameReg: Record a frame register.
//
// Arguments:
// reg - The register being set as the frame register.
// offset - The offset from the current stack pointer that the frame pointer will point at.
//
void Compiler::unwindSetFrameReg(regNumber reg, unsigned offset)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
assert(func->unwindHeader.Version == 1); // Can't call this before unwindBegProlog
assert(func->unwindHeader.CountOfUnwindCodes == 0); // Can't call this after unwindReserve
assert(func->unwindCodeSlot > sizeof(UNWIND_CODE));
UNWIND_CODE * code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
code->CodeOffset = (BYTE)cbProlog;
code->UnwindOp = UWOP_SET_FPREG;
code->OpInfo = 0;
func->unwindHeader.FrameRegister = (BYTE)reg;
assert(offset <= 240);
assert(offset % 16 == 0);
func->unwindHeader.FrameOffset = offset / 16;
}
//------------------------------------------------------------------------
// Compiler::unwindAllocStack: Record a stack frame allocation (sub sp, X).
//
// Arguments:
// size - The size of the stack frame allocation (the amount subtracted from the stack pointer).
//
void Compiler::unwindAllocStack(unsigned size)
{
assert(compGeneratingProlog);
FuncInfoDsc* func = funCurrentFunc();
assert(func->unwindHeader.Version == 1); // Can't call this before unwindBegProlog
assert(func->unwindHeader.CountOfUnwindCodes == 0); // Can't call this after unwindReserve
assert(size % 8 == 0); // Stack size is *always* 8 byte aligned
UNWIND_CODE * code;
if (size <= 128)
{
assert(func->unwindCodeSlot > sizeof(UNWIND_CODE));
code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
code->UnwindOp = UWOP_ALLOC_SMALL;
code->OpInfo = (size - 8) / 8;
}
else if (size <= 0x7FFF8)
{
assert(func->unwindCodeSlot > (sizeof(UNWIND_CODE) + sizeof(USHORT)));
USHORT * codedSize = (USHORT*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(USHORT)];
*codedSize = (USHORT)(size / 8);
code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
code->UnwindOp = UWOP_ALLOC_LARGE;
code->OpInfo = 0;
}
else
{
assert(func->unwindCodeSlot > (sizeof(UNWIND_CODE) + sizeof(ULONG)));
ULONG * codedSize = (ULONG*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(ULONG)];
*codedSize = size;
code = (UNWIND_CODE*)&func->unwindCodes[func->unwindCodeSlot -= sizeof(UNWIND_CODE)];
code->UnwindOp = UWOP_ALLOC_LARGE;
code->OpInfo = 1;
}
unsigned int cbProlog = unwindGetCurrentOffset(func);
noway_assert((BYTE)cbProlog == cbProlog);
code->CodeOffset = (BYTE)cbProlog;
}