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Issue #3049 - loongarch64: flush icache after JIT runtime patching

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Basilisk-Dev 2026-04-25 15:10:38 -04:00 • committed by wuggy
commit 8360fe94be
1 changed files with 21 additions and 0 deletions
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21
js/src/jit/loongarch64/Assembler-loongarch64.cpp
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@ -18,6 +18,21 @@ using mozilla::DebugOnly;
using namespace js;
using namespace js::jit;
static size_t Load64PatchSize(Instruction* inst0) {
InstImm* i0 = (InstImm*)inst0;
InstImm* i1 = (InstImm*)i0->next();
InstImm* i2 = (InstImm*)i1->next();
InstImm* i3 = (InstImm*)i2->next();
MOZ_ASSERT((i0->extractBitField(31, 25)) == ((uint32_t)op_lu12i_w >> 25));
MOZ_ASSERT((i1->extractBitField(31, 22)) == ((uint32_t)op_ori >> 22));
MOZ_ASSERT((i2->extractBitField(31, 25)) == ((uint32_t)op_lu32i_d >> 25));
return ((i3->extractBitField(31, 22)) == ((uint32_t)op_lu52i_d >> 22))
? 4 * sizeof(uint32_t)
: 3 * sizeof(uint32_t);
}
void js::jit::PatchJump(CodeLocationJump& jump_, CodeLocationLabel label,
ReprotectCode reprotect) {
Instruction* inst = reinterpret_cast<Instruction*>(jump_.raw());
@ -2302,6 +2317,7 @@ static void TraceOneDataRelocation(JSTracer* trc,
awjc.emplace(code);
}
Assembler::UpdateLoad64Value(inst, uint64_t(ptr));
AutoFlushICache::flush(uintptr_t(inst), Load64PatchSize(inst));
}
}
@ -2428,6 +2444,8 @@ void Assembler::PatchWrite_NearCall(CodeLocationLabel start,
// Short jump wouldn't be more efficient.
Assembler::WriteLoad64Instructions(inst, ScratchRegister, (uint64_t)dest);
inst[3] = InstImm(op_jirl, BOffImm16(0), ScratchRegister, ra);
AutoFlushICache::flush(uintptr_t(inst), PatchWrite_NearCallSize());
}
uint64_t Assembler::ExtractLoad64Value(Instruction* inst0) {
@ -2527,6 +2545,7 @@ void Assembler::PatchDataWithValueCheck(CodeLocationLabel label,
// Replace with new value
Assembler::UpdateLoad64Value(inst, uint64_t(newValue.value));
AutoFlushICache::flush(uintptr_t(inst), Load64PatchSize(inst));
}
void Assembler::PatchInstructionImmediate(uint8_t* code, PatchedImmPtr imm) {
@ -2557,4 +2576,6 @@ void Assembler::ToggleCall(CodeLocationLabel inst_, bool enabled) {
InstNOP nop;
*i3 = nop;
}
AutoFlushICache::flush(uintptr_t(i3), sizeof(uint32_t));
}