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ppcopcodes: fix lswx/stswx emulation.

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This commit is contained in:
Maxim Poliakovski 2022-02-18 13:59:50 +01:00
parent 689fe51d80
commit 477ad7ddee
1 changed files with 17 additions and 34 deletions
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51
cpu/ppc/ppcopcodes.cpp
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@ -1994,47 +1994,36 @@ void dppc_interpreter::ppc_lswx() {
ppc_grab_regsdab();
// Invalid instruction forms
if ((ppc_result_d == 0) && (ppc_result_a == 0)) {
ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
}
if ((ppc_result_d == ppc_result_a) || (ppc_result_a == ppc_result_b)) {
if ((reg_d | reg_a) == 0 || (reg_d == reg_a) || (reg_d == reg_b)) {
ppc_exception_handler(Except_Type::EXC_PROGRAM, Exc_Cause::ILLEGAL_OP);
}
ppc_effective_address = reg_a ? (ppc_result_a + ppc_result_b) : ppc_result_b;
grab_inb = ppc_state.spr[SPR::XER] & 127;
grab_inb = ppc_state.spr[SPR::XER] & 0x7F;
uint32_t stringed_word = 0;
while (grab_inb > 0) {
switch (grab_inb) {
case 1:
stringed_word = mmu_read_vmem<uint8_t>(ppc_effective_address) << 24;
//stringed_word = mem_grab_byte(ppc_effective_address) << 24;
ppc_state.gpr[reg_d] = stringed_word;
ppc_state.gpr[reg_d] = mmu_read_vmem<uint8_t>(ppc_effective_address) << 24;
grab_inb = 0;
break;
case 2:
stringed_word = mmu_read_vmem<uint8_t>(ppc_effective_address) << 24;
//stringed_word = mem_grab_byte(ppc_effective_address) << 24;
stringed_word += mmu_read_vmem<uint8_t>(ppc_effective_address + 1) << 16;
//stringed_word += mem_grab_byte(ppc_effective_address + 1) << 16;
ppc_state.gpr[reg_d] = stringed_word;
ppc_state.gpr[reg_d] = mmu_read_vmem<uint16_t>(ppc_effective_address) << 16;
grab_inb = 0;
break;
case 3:
stringed_word = mmu_read_vmem<uint8_t>(ppc_effective_address) << 24;
//stringed_word = mem_grab_byte(ppc_effective_address) << 24;
stringed_word += mmu_read_vmem<uint8_t>(ppc_effective_address + 1) << 16;
//stringed_word += mem_grab_byte(ppc_effective_address + 1) << 16;
stringed_word = mmu_read_vmem<uint16_t>(ppc_effective_address) << 16;
stringed_word += mmu_read_vmem<uint8_t>(ppc_effective_address + 2) << 8;
//stringed_word += mem_grab_byte(ppc_effective_address + 2) << 8;
ppc_state.gpr[reg_d] = stringed_word;
grab_inb = 0;
break;
default:
//ppc_state.gpr[reg_d] = mem_grab_word(ppc_effective_address);
ppc_state.gpr[reg_d] = mmu_read_vmem<uint16_t>(ppc_effective_address);
ppc_state.gpr[reg_d] = mmu_read_vmem<uint32_t>(ppc_effective_address);
reg_d++;
if (reg_d >= 32) { // wrap around through GPR0
reg_d = 0;
}
ppc_effective_address += 4;
grab_inb -= 4;
}
@ -2094,30 +2083,24 @@ void dppc_interpreter::ppc_stswx() {
while (grab_inb > 0) {
switch (grab_inb) {
case 1:
mmu_write_vmem<uint8_t>(ppc_effective_address, (ppc_result_d >> 24));
//mem_write_byte(ppc_effective_address, (ppc_result_d >> 24));
mmu_write_vmem<uint8_t>(ppc_effective_address, ppc_state.gpr[reg_s] >> 24);
grab_inb = 0;
break;
case 2:
mmu_write_vmem<uint8_t>(ppc_effective_address, ((ppc_result_d >> 24) & 0xFF));
//mem_write_byte(ppc_effective_address, ((ppc_result_d >> 24) & 0xFF));
mmu_write_vmem<uint8_t>((ppc_effective_address + 1), ((ppc_result_d >> 16) & 0xFF));
//mem_write_byte((ppc_effective_address + 1), ((ppc_result_d >> 16) & 0xFF));
mmu_write_vmem<uint16_t>(ppc_effective_address, ppc_state.gpr[reg_s] >> 16);
grab_inb = 0;
break;
case 3:
mmu_write_vmem<uint8_t>(ppc_effective_address, ((ppc_result_d >> 24) & 0xFF));
//mem_write_byte(ppc_effective_address, ((ppc_result_d >> 24) & 0xFF));
mmu_write_vmem<uint8_t>((ppc_effective_address + 1), ((ppc_result_d >> 16) & 0xFF));
//mem_write_byte((ppc_effective_address + 1), ((ppc_result_d >> 16) & 0xFF));
mmu_write_vmem<uint8_t>((ppc_effective_address + 2), ((ppc_result_d >> 8) & 0xFF));
//mem_write_byte((ppc_effective_address + 2), ((ppc_result_d >> 8) & 0xFF));
mmu_write_vmem<uint16_t>(ppc_effective_address, ppc_state.gpr[reg_s] >> 16);
mmu_write_vmem<uint8_t>(ppc_effective_address + 2, (ppc_state.gpr[reg_s] >> 8) & 0xFF);
grab_inb = 0;
break;
default:
mmu_write_vmem<uint32_t>(ppc_effective_address, ppc_result_d);
//mem_write_dword(ppc_effective_address, ppc_result_d);
mmu_write_vmem<uint32_t>(ppc_effective_address, ppc_state.gpr[reg_s]);
reg_s++;
if (reg_s >= 32) { // wrap around through GPR0
reg_s = 0;
}
ppc_effective_address += 4;
grab_inb -= 4;
}