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mrc r15 updates flags

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also my prior implementation made mrc w/ r15 raise an exception by accident
oops!
This commit is contained in:
Jaklyy 2024-10-10 11:09:07 -04:00
parent 93dce82b07
commit 787d0c9afc
1 changed files with 9 additions and 3 deletions
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12
src/ARMInterpreter.cpp
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@ -297,11 +297,17 @@ void A_MRC(ARM* cpu)
u32 cpinfo = (cpu->CurInstr >> 5) & 0x7;
u32 rd = (cpu->CurInstr>>12) & 0xF;
if (cpu->Num==0 && cp==15 && rd!=15)
if (cpu->Num==0 && cp==15)
{
cpu->R[rd] = ((ARMv5*)cpu)->CP15Read((cn<<8)|(cm<<4)|cpinfo);
if (rd != 15) cpu->R[rd] = ((ARMv5*)cpu)->CP15Read((cn<<8)|(cm<<4)|cpinfo);
else
{
// r15 updates the top 4 bits of the cpsr, done to "allow for conditional branching based on coprocessor status"
u32 flags = ((ARMv5*)cpu)->CP15Read((cn<<8)|(cm<<4)|cpinfo) & 0xF0000000;
cpu->CPSR = (cpu->CPSR & ~0xF0000000) | flags;
}
}
else if (cpu->Num==1 && cp==14 && rd!=15)
else if (cpu->Num==1 && cp==14)
{
Log(LogLevel::Debug, "MRC p14,%d,%d,%d on ARM7\n", cn, cm, cpinfo);
}