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https://github.com/c64scene-ar/llvm-6502.git
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1b41835f02
In sparc, setjmp stores only the registers %fp, %sp, %i7 and %o7. longjmp restores the stack, and the callee-saved registers (all local/in registers: %i0-%i7, %l0-%l7) using the stored %fp and register windows. However, this does not guarantee that the longjmp will restore the registers, as they were when the setjmp was called. This is because these registers may be clobbered after returning from setjmp, but before calling longjmp. This patch prevents the registers %i0-%i5, %l0-l7 to live across the setjmp call using the register mask. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190033 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
//===-- SparcRegisterInfo.h - Sparc Register Information Impl ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Sparc implementation of the TargetRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SPARCREGISTERINFO_H
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#define SPARCREGISTERINFO_H
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#include "llvm/Target/TargetRegisterInfo.h"
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#define GET_REGINFO_HEADER
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#include "SparcGenRegisterInfo.inc"
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namespace llvm {
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class SparcSubtarget;
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class TargetInstrInfo;
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class Type;
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struct SparcRegisterInfo : public SparcGenRegisterInfo {
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SparcSubtarget &Subtarget;
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SparcRegisterInfo(SparcSubtarget &st);
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/// Code Generation virtual methods...
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const uint16_t *getCalleeSavedRegs(const MachineFunction *MF = 0) const;
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const uint32_t* getCallPreservedMask(CallingConv::ID CC) const;
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const uint32_t* getRTCallPreservedMask(CallingConv::ID CC) const;
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BitVector getReservedRegs(const MachineFunction &MF) const;
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const TargetRegisterClass *getPointerRegClass(const MachineFunction &MF,
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unsigned Kind) const;
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void eliminateFrameIndex(MachineBasicBlock::iterator II,
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int SPAdj, unsigned FIOperandNum,
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RegScavenger *RS = NULL) const;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS = NULL) const;
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// Debug information queries.
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unsigned getFrameRegister(const MachineFunction &MF) const;
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// Exception handling queries.
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unsigned getEHExceptionRegister() const;
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unsigned getEHHandlerRegister() const;
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};
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} // end namespace llvm
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#endif
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