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Fixed x86-32 recompiler MMX entry code

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Fixed FPU tag resetting in EMMS instruction
Clear MMX state in FINIT
Reset FPU state in FSAVE/FNSAVE
Fixes issues with MMX when more than one MMX program is running
This commit is contained in:
SarahW 2017-01-13 21:31:42 +00:00
commit 9167b3a71f
3 changed files with 13 additions and 4 deletions
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9
src/x87_ops_misc.h
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@ -36,6 +36,7 @@ static int opFINIT(uint32_t fetchdat)
cpu_state.npxs = 0;
*(uint64_t *)cpu_state.tag = 0x0303030303030303ll;
cpu_state.TOP = 0;
cpu_state.ismmx = 0;
CLOCK_CYCLES(17);
return 0;
}
@ -272,6 +273,14 @@ static int FSAVE()
}
break;
}
cpu_state.npxc = 0x37F;
cpu_state.new_npxc = (cpu_state.old_npxc & ~0xc00);
cpu_state.npxs = 0;
*(uint64_t *)cpu_state.tag = 0x0303030303030303ll;
cpu_state.TOP = 0;
cpu_state.ismmx = 0;
CLOCK_CYCLES((cr0 & 1) ? 56 : 67);
return cpu_state.abrt;
}