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- generate a memset for the allocated stack memory because that's what the VM does

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(this really shouldn't be done by the VM either - the compiler backend should clear its registers if it wants them to be zero!)
This commit is contained in:
Magnus Norddahl 2018-11-15 22:33:13 +01:00
parent f3e0db913c
commit 0394dc56b7
1 changed files with 15 additions and 0 deletions
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15
src/scripting/vm/jit.cpp
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@ -589,6 +589,21 @@ void JitCompiler::Setup()
cc.mov(x86::word_ptr(vmframe, offsetof(VMFrame, MaxParam)), sfunc->MaxParam);
cc.mov(x86::word_ptr(vmframe, offsetof(VMFrame, NumParam)), 0);
// Zero initialize the variables (retardedly stupid to do here - should be done by the compiler backend!!)
unsigned int clearoffset = (unsigned int)offsetof(VMFrame, NumParam) + 2;
unsigned int sselength = (sfunc->StackSize - clearoffset) / 4;
auto zerosse = newTempXmmPd();
cc.xorpd(zerosse, zerosse);
for (unsigned int i = 0; i < sselength * 4; i += 4)
cc.movupd(x86::ptr(vmframe, clearoffset + i), zerosse);
if (clearoffset + sselength * 4 < sfunc->StackSize)
{
auto zero32 = newTempInt32();
cc.xor_(zero32, zero32);
for (unsigned int i = clearoffset + sselength * 4; i < sfunc->StackSize; i++)
cc.mov(asmjit::x86::byte_ptr(vmframe, i), zero32.r8Lo());
}
auto fillParams = CreateCall<void, VMFrame *, VMValue *, int>([](VMFrame *newf, VMValue *args, int numargs) {
try
{