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15994 Revisions

r6586 Wednesday 9th December, 2009 at 05:29:36 UTC by Barry Rodewald
[i386] Implemented 32-bit SLDT and STR instructions, fixed FPU instruction use on i386.

[src/emu/cpu/i386]

i386op32.c i386ops.c

src/emu/cpu/i386/i386ops.c
r6585	r6586
2212	2212	static void I386OP(escape)(i386_state *cpustate) // Opcodes 0xd8 - 0xdf
2213	2213	{
2214	2214	UINT8 modrm = FETCH(cpustate);
	2215	if(modrm < 0xc0)
	2216	{
	2217	UINT32 ea;
	2218	ea = GetEA(cpustate,modrm);
	2219	}
2215	2220	CYCLES(cpustate,3); // TODO: confirm this
2216	2221	(void) LOAD_RM8(modrm);
2217	2222	}

src/emu/cpu/i386/i386op32.c
r6585	r6586
2655	2655
2656	2656	switch( (modrm >> 3) & 0x7 )
2657	2657	{
	2658	case 0: /* SLDT */
	2659	if ( PROTECTED_MODE && !V8086_MODE )
	2660	{
	2661	if( modrm >= 0xc0 ) {
	2662	address = LOAD_RM32(modrm);
	2663	STORE_RM32(address, cpustate->ldtr.segment);
	2664	CYCLES(cpustate,CYCLES_SLDT_REG);
	2665	} else {
	2666	ea = GetEA(cpustate,modrm);
	2667	WRITE32(cpustate, ea, cpustate->ldtr.segment);
	2668	CYCLES(cpustate,CYCLES_SLDT_MEM);
	2669	}
	2670	}
	2671	else
	2672	{
	2673	i386_trap(cpustate,6, 0);
	2674	}
	2675	break;
	2676	case 1: /* STR */
	2677	if ( PROTECTED_MODE && !V8086_MODE )
	2678	{
	2679	if( modrm >= 0xc0 ) {
	2680	address = LOAD_RM32(modrm);
	2681	STORE_RM32(address, cpustate->task.segment);
	2682	CYCLES(cpustate,CYCLES_STR_REG);
	2683	} else {
	2684	ea = GetEA(cpustate,modrm);
	2685	WRITE32(cpustate, ea, cpustate->task.segment);
	2686	CYCLES(cpustate,CYCLES_STR_MEM);
	2687	}
	2688	}
	2689	else
	2690	{
	2691	i386_trap(cpustate,6, 0);
	2692	}
	2693	break;
2658	2694	case 2: /* LLDT */
2659	2695	if ( PROTECTED_MODE && !V8086_MODE )
2660	2696	{

15994 Revisions