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A64/PopRSBHint: Prevent RETing to a guest PC of ~0ull from crashing the jit

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MerryMage 2018-07-16 18:24:29 +01:00
parent 4525209bab
commit 58f3399032
1 changed files with 2 additions and 1 deletions
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src/backend_x64/a64_emit_x64.cpp
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@ -1005,7 +1005,8 @@ void A64EmitX64::EmitTerminalImpl(IR::Term::LinkBlockFast terminal, IR::Location
void A64EmitX64::EmitTerminalImpl(IR::Term::PopRSBHint, IR::LocationDescriptor) {
// This calculation has to match up with A64::LocationDescriptor::UniqueHash
// TODO: Optimization is available here based on known state of FPSCR_mode and CPSR_et.
code.mov(rcx, qword[r15 + offsetof(A64JitState, pc)]);
code.mov(rcx, A64::LocationDescriptor::PC_MASK);
code.and_(rcx, qword[r15 + offsetof(A64JitState, pc)]);
code.mov(ebx, dword[r15 + offsetof(A64JitState, fpcr)]);
code.and_(ebx, A64::LocationDescriptor::FPCR_MASK);
code.shl(ebx, 37);