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[stack protector] Fix a potential security bug in stack protector where the

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address of the stack guard was being spilled to the stack.

Previously the address of the stack guard would get spilled to the stack if it
was impossible to keep it in a register. This patch introduces a new target
independent node and pseudo instruction which gets expanded post-RA to a
sequence of instructions that load the stack guard value. Register allocator
can now just remat the value when it can't keep it in a register. 

<rdar://problem/12475629>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2014-07-25 19:31:34 +00:00
parent 24dfa53b8a
commit 0651a556fe
26 changed files with 377 additions and 9 deletions
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utils/TableGen/CodeGenTarget.cpp
+2 -1
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@@ -301,7 +301,8 @@ void CodeGenTarget::ComputeInstrsByEnum() const {
"GC_LABEL", "KILL", "EXTRACT_SUBREG", "INSERT_SUBREG",
"IMPLICIT_DEF", "SUBREG_TO_REG", "COPY_TO_REGCLASS", "DBG_VALUE",
"REG_SEQUENCE", "COPY", "BUNDLE", "LIFETIME_START",
"LIFETIME_END", "STACKMAP", "PATCHPOINT", nullptr};
"LIFETIME_END", "STACKMAP", "PATCHPOINT", "LOAD_STACK_GUARD",
nullptr};
const DenseMap<const Record*, CodeGenInstruction*> &Insts = getInstructions();
for (const char *const *p = FixedInstrs; *p; ++p) {
const CodeGenInstruction *Instr = GetInstByName(*p, Insts, Records);