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https://github.com/c64scene-ar/llvm-6502.git
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6a3a1ba97e
Don't spill to the CR save area when using the SVR4 ABI for now. Don't rely on constants assigned for registers to be in order (they aren't assigned in order). Make sure CR bits are mapped to the corresponding CR field. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74767 91177308-0d34-0410-b5e6-96231b3b80d8
186 lines
6.7 KiB
C++
186 lines
6.7 KiB
C++
//===-- PPCFrameInfo.h - Define TargetFrameInfo for PowerPC -----*- 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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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC_FRAMEINFO_H
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#define POWERPC_FRAMEINFO_H
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#include "PPC.h"
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#include "PPCSubtarget.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/ADT/STLExtras.h"
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namespace llvm {
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class PPCFrameInfo: public TargetFrameInfo {
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const TargetMachine &TM;
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public:
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PPCFrameInfo(const TargetMachine &tm, bool LP64)
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: TargetFrameInfo(TargetFrameInfo::StackGrowsDown, 16, 0), TM(tm) {
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}
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/// getReturnSaveOffset - Return the previous frame offset to save the
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/// return address.
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static unsigned getReturnSaveOffset(bool LP64, bool isDarwinABI) {
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if (isDarwinABI)
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return LP64 ? 16 : 8;
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// SVR4 ABI:
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return 4;
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}
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/// getFramePointerSaveOffset - Return the previous frame offset to save the
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/// frame pointer.
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static unsigned getFramePointerSaveOffset(bool LP64, bool isDarwinABI) {
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// For the Darwin ABI:
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// Use the TOC save slot in the PowerPC linkage area for saving the frame
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// pointer (if needed.) LLVM does not generate code that uses the TOC (R2
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// is treated as a caller saved register.)
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if (isDarwinABI)
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return LP64 ? 40 : 20;
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// SVR4 ABI:
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// Save it right before the link register
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return -4U;
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}
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/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
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///
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static unsigned getLinkageSize(bool LP64, bool isDarwinABI) {
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if (isDarwinABI)
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return 6 * (LP64 ? 8 : 4);
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// SVR4 ABI:
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return 8;
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}
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/// getMinCallArgumentsSize - Return the size of the minium PowerPC ABI
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/// argument area.
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static unsigned getMinCallArgumentsSize(bool LP64, bool isDarwinABI) {
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// For the Darwin ABI:
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// The prolog code of the callee may store up to 8 GPR argument registers to
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// the stack, allowing va_start to index over them in memory if its varargs.
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// Because we cannot tell if this is needed on the caller side, we have to
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// conservatively assume that it is needed. As such, make sure we have at
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// least enough stack space for the caller to store the 8 GPRs.
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if (isDarwinABI)
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return 8 * (LP64 ? 8 : 4);
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// SVR4 ABI:
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// There is no default stack allocated for the 8 first GPR arguments.
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return 0;
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}
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/// getMinCallFrameSize - Return the minimum size a call frame can be using
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/// the PowerPC ABI.
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static unsigned getMinCallFrameSize(bool LP64, bool isDarwinABI) {
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// The call frame needs to be at least big enough for linkage and 8 args.
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return getLinkageSize(LP64, isDarwinABI) +
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getMinCallArgumentsSize(LP64, isDarwinABI);
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}
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// With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
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const std::pair<unsigned, int> *
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getCalleeSavedSpillSlots(unsigned &NumEntries) const {
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// Early exit if not using the SVR4 ABI.
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if (!TM.getSubtarget<PPCSubtarget>().isSVR4ABI()) {
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NumEntries = 0;
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return 0;
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}
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static const std::pair<unsigned, int> Offsets[] = {
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// Floating-point register save area offsets.
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std::pair<unsigned, int>(PPC::F31, -8),
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std::pair<unsigned, int>(PPC::F30, -16),
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std::pair<unsigned, int>(PPC::F29, -24),
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std::pair<unsigned, int>(PPC::F28, -32),
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std::pair<unsigned, int>(PPC::F27, -40),
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std::pair<unsigned, int>(PPC::F26, -48),
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std::pair<unsigned, int>(PPC::F25, -56),
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std::pair<unsigned, int>(PPC::F24, -64),
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std::pair<unsigned, int>(PPC::F23, -72),
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std::pair<unsigned, int>(PPC::F22, -80),
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std::pair<unsigned, int>(PPC::F21, -88),
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std::pair<unsigned, int>(PPC::F20, -96),
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std::pair<unsigned, int>(PPC::F19, -104),
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std::pair<unsigned, int>(PPC::F18, -112),
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std::pair<unsigned, int>(PPC::F17, -120),
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std::pair<unsigned, int>(PPC::F16, -128),
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std::pair<unsigned, int>(PPC::F15, -136),
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std::pair<unsigned, int>(PPC::F14, -144),
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// General register save area offsets.
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std::pair<unsigned, int>(PPC::R31, -4),
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std::pair<unsigned, int>(PPC::R30, -8),
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std::pair<unsigned, int>(PPC::R29, -12),
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std::pair<unsigned, int>(PPC::R28, -16),
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std::pair<unsigned, int>(PPC::R27, -20),
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std::pair<unsigned, int>(PPC::R26, -24),
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std::pair<unsigned, int>(PPC::R25, -28),
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std::pair<unsigned, int>(PPC::R24, -32),
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std::pair<unsigned, int>(PPC::R23, -36),
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std::pair<unsigned, int>(PPC::R22, -40),
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std::pair<unsigned, int>(PPC::R21, -44),
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std::pair<unsigned, int>(PPC::R20, -48),
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std::pair<unsigned, int>(PPC::R19, -52),
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std::pair<unsigned, int>(PPC::R18, -56),
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std::pair<unsigned, int>(PPC::R17, -60),
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std::pair<unsigned, int>(PPC::R16, -64),
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std::pair<unsigned, int>(PPC::R15, -68),
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std::pair<unsigned, int>(PPC::R14, -72),
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// CR save area offset.
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// FIXME SVR4: Disable CR save area for now.
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// std::pair<unsigned, int>(PPC::CR2, -4),
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// std::pair<unsigned, int>(PPC::CR3, -4),
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// std::pair<unsigned, int>(PPC::CR4, -4),
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// std::pair<unsigned, int>(PPC::CR2LT, -4),
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// std::pair<unsigned, int>(PPC::CR2GT, -4),
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// std::pair<unsigned, int>(PPC::CR2EQ, -4),
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// std::pair<unsigned, int>(PPC::CR2UN, -4),
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// std::pair<unsigned, int>(PPC::CR3LT, -4),
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// std::pair<unsigned, int>(PPC::CR3GT, -4),
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// std::pair<unsigned, int>(PPC::CR3EQ, -4),
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// std::pair<unsigned, int>(PPC::CR3UN, -4),
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// std::pair<unsigned, int>(PPC::CR4LT, -4),
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// std::pair<unsigned, int>(PPC::CR4GT, -4),
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// std::pair<unsigned, int>(PPC::CR4EQ, -4),
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// std::pair<unsigned, int>(PPC::CR4UN, -4),
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// VRSAVE save area offset.
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std::pair<unsigned, int>(PPC::VRSAVE, -4),
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// Vector register save area
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std::pair<unsigned, int>(PPC::V31, -16),
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std::pair<unsigned, int>(PPC::V30, -32),
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std::pair<unsigned, int>(PPC::V29, -48),
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std::pair<unsigned, int>(PPC::V28, -64),
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std::pair<unsigned, int>(PPC::V27, -80),
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std::pair<unsigned, int>(PPC::V26, -96),
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std::pair<unsigned, int>(PPC::V25, -112),
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std::pair<unsigned, int>(PPC::V24, -128),
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std::pair<unsigned, int>(PPC::V23, -144),
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std::pair<unsigned, int>(PPC::V22, -160),
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std::pair<unsigned, int>(PPC::V21, -176),
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std::pair<unsigned, int>(PPC::V20, -192)
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};
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NumEntries = array_lengthof(Offsets);
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return Offsets;
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}
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};
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} // End llvm namespace
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#endif
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