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PPC DRC:

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* Fixed bug where a branch and link to the link register would
    overwrite the link register before fetching the target address
This commit is contained in:
Aaron Giles 2008-06-06 04:23:13 +00:00
parent b80ba7e56c
commit 829cf37d87
1 changed files with 10 additions and 6 deletions
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16
src/emu/cpu/powerpc/ppcdrc.c
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@ -2106,10 +2106,18 @@ static void generate_compute_flags(drcuml_block *block, int updatecr, UINT32 xer
static void generate_branch(drcuml_block *block, compiler_state *compiler, const opcode_desc *desc, int source, UINT8 link)
{
compiler_state compiler_temp = *compiler;
UINT32 *srcptr = &ppc->spr[source];
/* set the link if needed */
if (link)
{
if (desc->targetpc == BRANCH_TARGET_DYNAMIC && source == SPR_LR)
{
UML_MOV(block, MEM(&ppc->impstate->tempaddr), MEM(srcptr)); // mov [tempaddr],[lr]
srcptr = &ppc->impstate->tempaddr;
}
UML_MOV(block, SPR32(SPR_LR), IMM(desc->pc + 4)); // mov [lr],desc->pc + 4
}
/* update the cycles and jump through the hash table to the target */
if (desc->targetpc != BRANCH_TARGET_DYNAMIC)
@ -2122,12 +2130,8 @@ static void generate_branch(drcuml_block *block, compiler_state *compiler, const
}
else
{
UML_CMP(block, SPR32(source), IMM(0xb032));
UML_MOV(block, MEM(&ppc->impstate->arg0), IMM(desc->pc));
UML_CALLCc(block, IF_E, cfunc_printf_debug, "b032 @ PC=%08X\n");
generate_update_cycles(block, &compiler_temp, SPR32(source), TRUE); // <subtract cycles>
UML_HASHJMP(block, IMM(ppc->impstate->mode), SPR32(source), ppc->impstate->nocode); // hashjmp <mode>,<rsreg>,nocode
generate_update_cycles(block, &compiler_temp, MEM(srcptr), TRUE); // <subtract cycles>
UML_HASHJMP(block, IMM(ppc->impstate->mode), MEM(srcptr), ppc->impstate->nocode); // hashjmp <mode>,<rsreg>,nocode
}
/* update the label */