diff options
Diffstat (limited to 'lib/Target/PowerPC/PPCFastISel.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCFastISel.cpp | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCFastISel.cpp b/lib/Target/PowerPC/PPCFastISel.cpp index 924a07c6cf..1b4f12e2be 100644 --- a/lib/Target/PowerPC/PPCFastISel.cpp +++ b/lib/Target/PowerPC/PPCFastISel.cpp @@ -1197,6 +1197,10 @@ bool PPCFastISel::processCallArgs(SmallVectorImpl<Value*> &Args, bool IsVarArg) { SmallVector<CCValAssign, 16> ArgLocs; CCState CCInfo(CC, IsVarArg, *FuncInfo.MF, TM, ArgLocs, *Context); + + // Reserve space for the linkage area on the stack. + CCInfo.AllocateStack(PPCFrameLowering::getLinkageSize(true, false), 8); + CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CC_PPC64_ELF_FIS); // Bail out if we can't handle any of the arguments. @@ -1218,6 +1222,14 @@ bool PPCFastISel::processCallArgs(SmallVectorImpl<Value*> &Args, // Get a count of how many bytes are to be pushed onto the stack. NumBytes = CCInfo.getNextStackOffset(); + // The prolog code of the callee may store up to 8 GPR argument registers to + // the stack, allowing va_start to index over them in memory if its varargs. + // Because we cannot tell if this is needed on the caller side, we have to + // conservatively assume that it is needed. As such, make sure we have at + // least enough stack space for the caller to store the 8 GPRs. + NumBytes = std::max(NumBytes, + PPCFrameLowering::getMinCallFrameSize(true, false)); + // Issue CALLSEQ_START. BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TII.getCallFrameSetupOpcode())) |