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A64: Let the Simulator trap BLR XZR instructions.

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This instruction is used as a guard for the constant pool.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/170673003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19461 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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alexandre.rames@arm.com 2014-02-18 17:10:04 +00:00
parent 58d0682f8d
commit 1f268f4b91
1 changed files with 5 additions and 0 deletions
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5
src/a64/simulator-a64.cc
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@ -986,6 +986,11 @@ void Simulator::VisitUnconditionalBranchToRegister(Instruction* instr) {
switch (instr->Mask(UnconditionalBranchToRegisterMask)) {
case BLR: {
set_lr(instr->NextInstruction());
if (instr->Rn() == 31) {
// BLR XZR is used as a guard for the constant pool. We should never hit
// this, but if we do trap to allow debugging.
Debug();
}
// Fall through.
}
case BR: