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devel/llvm/patches/patch-lib_Target_PowerPC_PPCInstrInfo_td

@@ -0,0 +1,37 @@
+Add RETGUARD implementation for powerpc and powerpc64.
+
+Index: lib/Target/PowerPC/PPCInstrInfo.td
+--- lib/Target/PowerPC/PPCInstrInfo.td.orig
++++ lib/Target/PowerPC/PPCInstrInfo.td
+@@ -1690,6 +1690,31 @@ let Defs = [LR] in
+   def MoveGOTtoLR : PPCEmitTimePseudo<(outs), (ins), "#MoveGOTtoLR", []>,
+                     PPC970_Unit_BRU;
+ 
++// Pseudo instruction used by retguard.
++//
++// We need to get the PC into a register in order to calculate the address of
++// the retguard cookies. This pseudo will branch immediately forward to get PC
++// in LR, and then move LR into the destination register. The current value of
++// LR is saved and restored via the given temp register, which is trashed.
++let Size = 16 in {
++def RETGUARD_LOAD_PC : PPCEmitTimePseudo<(outs gprc:$dest), (ins gprc:$tmp),
++                       "#RGLoadPC", []>;
++}
++
++// Once we have the PC in a register, we need to load the address of the GOT
++// into another register so we can then finally load the local offset of the
++// retguard symbol entry from the GOT and then the cookie value.
++let Size = 8 in {
++def RETGUARD_LOAD_GOT : PPCEmitTimePseudo<(outs gprc:$dest),
++                        (ins gprc:$pc, calltarget:$sym), "RGLoadGOT", []>;
++}
++
++let Size = 8 in {
++// For static linkage, we can load the cookie directly
++def RETGUARD_LOAD_COOKIE : PPCEmitTimePseudo<(outs gprc:$dest),
++                        (ins calltarget:$sym), "RGLoadCookie", []>;
++}
++
+ let isBranch = 1, isTerminator = 1, hasCtrlDep = 1, PPC970_Unit = 7 in {
+   let isBarrier = 1 in {
+     let isPredicable = 1 in