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This commit is contained in:
Jonathan Campbell
2021-11-22 10:58:43 -08:00
parent 20c25e9487
commit 7a3a4fbc14
1 changed files with 23 additions and 23 deletions
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46
src/cpu/cpu.cpp
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@@ -4284,34 +4284,34 @@ bool CPU_WRMSR() {
/* NTS: Hopefully by implementing this Windows ME can stop randomly crashing when cputype=pentium */
void CPU_CMPXCHG8B(PhysPt eaa) {
uint32_t hi,lo;
uint32_t hi,lo;
/* NTS: We assume that, if reading doesn't cause a page fault, writing won't either */
hi = (uint32_t)mem_readd(eaa+(PhysPt)4);
lo = (uint32_t)mem_readd(eaa);
/* NTS: We assume that, if reading doesn't cause a page fault, writing won't either */
hi = (uint32_t)mem_readd(eaa+(PhysPt)4);
lo = (uint32_t)mem_readd(eaa);
LOG_MSG("Experimental CMPXCHG8B implementation executed. EDX:EAX=0x%08lx%08lx ECX:EBX=0x%08lx%08lx EA=0x%08lx MEM64=0x%08lx%08lx",
(unsigned long)reg_edx,
(unsigned long)reg_eax,
(unsigned long)reg_ecx,
(unsigned long)reg_ebx,
(unsigned long)eaa,
(unsigned long)hi,
(unsigned long)lo);
LOG_MSG("Experimental CMPXCHG8B implementation executed. EDX:EAX=0x%08lx%08lx ECX:EBX=0x%08lx%08lx EA=0x%08lx MEM64=0x%08lx%08lx",
(unsigned long)reg_edx,
(unsigned long)reg_eax,
(unsigned long)reg_ecx,
(unsigned long)reg_ebx,
(unsigned long)eaa,
(unsigned long)hi,
(unsigned long)lo);
/* Compare EDX:EAX with 64-bit DWORD at memaddr 'eaa'.
* if they match, ZF=1 and write ECX:EBX to memaddr 'eaa'.
* else, ZF=0 and load memaddr 'eaa' into EDX:EAX */
if (reg_edx == hi && reg_eax == lo) {
mem_writed(eaa+(PhysPt)4,reg_ecx);
mem_writed(eaa, reg_ebx);
/* Compare EDX:EAX with 64-bit DWORD at memaddr 'eaa'.
* if they match, ZF=1 and write ECX:EBX to memaddr 'eaa'.
* else, ZF=0 and load memaddr 'eaa' into EDX:EAX */
if (reg_edx == hi && reg_eax == lo) {
mem_writed(eaa+(PhysPt)4,reg_ecx);
mem_writed(eaa, reg_ebx);
SETFLAGBIT(ZF,true);
}
else {
}
else {
SETFLAGBIT(ZF,false);
reg_edx = hi;
reg_eax = lo;
}
reg_edx = hi;
reg_eax = lo;
}
}
namespace