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Fixed an ARM7 R15 bit ignoring behaviour while in ARM state, fixes Lupin the Third: the Typing ARM crashing when you coin it up. [Tim Schuerewegen]

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This commit is contained in:
Angelo Salese 2011-01-12 22:25:23 +00:00
parent b663d1a0bb
commit b931b12a30
1 changed files with 11 additions and 3 deletions
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12
src/emu/cpu/arm7/arm7exec.c
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@ -57,7 +57,10 @@
INT32 offs;
pc = R15;
// "In Thumb state, bit [0] is undefined and must be ignored. Bits [31:1] contain the PC."
raddr = pc & (~1);
if ( COPRO_CTRL & COPRO_CTRL_MMU_EN )
{
raddr = arm7_tlb_translate(cpustate, raddr, ARM7_TLB_ABORT_P);
@ -1169,12 +1172,17 @@
}
else
{
UINT32 raddr;
/* load 32 bit instruction */
pc = GET_PC;
// "In ARM state, bits [1:0] of r15 are undefined and must be ignored. Bits [31:2] contain the PC."
raddr = pc & (~3);
if ( COPRO_CTRL & COPRO_CTRL_MMU_EN )
{
pc = arm7_tlb_translate(cpustate, pc, ARM7_TLB_ABORT_P);
raddr = arm7_tlb_translate(cpustate, raddr, ARM7_TLB_ABORT_P);
if (cpustate->pendingAbtP != 0)
{
goto skip_exec;
@ -1191,7 +1199,7 @@
}
#endif
insn = cpustate->direct->read_decrypted_dword(pc);
insn = cpustate->direct->read_decrypted_dword(raddr);
/* process condition codes for this instruction */
switch (insn >> INSN_COND_SHIFT)