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ppcopcodes: Fix lswx for MPC601.

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joevt 2024-12-01 05:17:00 -08:00 committed by dingusdev
parent 35919802f3
commit 84075c5988
1 changed files with 17 additions and 19 deletions
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36
cpu/ppc/ppcopcodes.cpp
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@ -1837,28 +1837,26 @@ void dppc_interpreter::ppc_lswx(uint32_t opcode) {
*/
uint32_t ea = ppc_result_b + (reg_a ? ppc_result_a : 0);
uint32_t grab_inb = ppc_state.spr[SPR::XER] & 0x7F;
int grab_inb = ppc_state.spr[SPR::XER] & 0x7F;
for (;;) {
while (grab_inb > 0) {
if (is_601 && (reg_d == reg_b || (reg_a != 0 && reg_d == reg_a))) {
// UNTESTED! MPC601 manual is inconsistant on whether reg_b is skipped or not
reg_d = (reg_d + 1) & 0x1F; // wrap around through GPR0
/* skip loading reg_b for MPC601 */
} else {
switch (grab_inb) {
case 1:
ppc_state.gpr[reg_d] = mmu_read_vmem<uint8_t>(opcode, ea) << 24;
return;
case 2:
ppc_state.gpr[reg_d] = mmu_read_vmem<uint16_t>(opcode, ea) << 16;
return;
case 3:
ppc_state.gpr[reg_d] = (mmu_read_vmem<uint16_t>(opcode, ea) << 16)
| (mmu_read_vmem<uint8_t>(opcode, ea + 2) << 8);
return;
}
ppc_state.gpr[reg_d] = mmu_read_vmem<uint32_t>(opcode, ea);
}
switch (grab_inb) {
case 0:
return;
case 1:
ppc_state.gpr[reg_d] = mmu_read_vmem<uint8_t>(opcode, ea) << 24;
return;
case 2:
ppc_state.gpr[reg_d] = mmu_read_vmem<uint16_t>(opcode, ea) << 16;
return;
case 3:
ppc_state.gpr[reg_d] = (mmu_read_vmem<uint16_t>(opcode, ea) << 16)
| (mmu_read_vmem<uint8_t>(opcode, ea + 2) << 8);
return;
}
ppc_state.gpr[reg_d] = mmu_read_vmem<uint32_t>(opcode, ea);
reg_d = (reg_d + 1) & 0x1F; // wrap around through GPR0
ea += 4;
grab_inb -= 4;