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