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Fix XThread::StepIntoBranch not properly stepping into blr/bctr

This commit is contained in:
Dr. Chat 2015-12-12 19:35:51 -06:00 committed by Ben Vanik
parent 44c9e8fe25
commit b58e9afbf1
1 changed files with 14 additions and 28 deletions
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42
src/xenia/kernel/xthread.cc
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@ -795,8 +795,18 @@ uint32_t XThread::StepIntoBranch(uint32_t pc) {
auto context = thread_state_->context();
if (i.type->type & (1 << 4) /* BranchAlways */) {
if (i.type->opcode == 0x48000000) {
if (i.type->type & (1 << 4) /* BranchAlways */
|| i.code == 0x4E800020 /* blr */
|| i.code == 0x4E800420 /* bctr */) {
if (i.code == 0x4E800020) {
// blr
uint32_t nia = uint32_t(context->lr);
StepToAddress(nia);
} else if (i.code == 0x4E800420) {
// bctr
uint32_t nia = uint32_t(context->ctr);
StepToAddress(nia);
} else if (i.type->opcode == 0x48000000) {
// bx
uint32_t nia = 0;
if (i.I.AA) {
@ -817,31 +827,9 @@ uint32_t XThread::StepIntoBranch(uint32_t pc) {
fence.Signal();
};
bool conditional = true;
if (i.type->opcode = 0x40000000) {
// bx
if (cpu::frontend::select_bits(i.B.BO, 4, 4) &&
cpu::frontend::select_bits(i.B.BO, 2, 2)) {
conditional = false;
}
} else if (i.type->opcode == 0x4C000420) {
// bctrx
if (cpu::frontend::select_bits(i.XL.BO, 2, 2)) {
// ignore cond
conditional = false;
}
} else if (i.type->opcode == 0x4C000020) {
// blrx
if (cpu::frontend::select_bits(i.B.BO, 4, 4) &&
cpu::frontend::select_bits(i.B.BO, 2, 2)) {
// ignore ctr
conditional = false;
}
}
cpu::Breakpoint bpt(kernel_state()->processor(), callback);
cpu::Breakpoint bpf(kernel_state()->processor(), pc + 4, callback);
if (conditional && !bpf.Install()) {
if (!bpf.Install()) {
XELOGE("XThread: Could not install breakpoint to step forward!");
assert_always();
}
@ -874,9 +862,7 @@ uint32_t XThread::StepIntoBranch(uint32_t pc) {
thread_->Resume();
fence.Wait();
bpt.Uninstall();
if (conditional) {
bpf.Uninstall();
}
bpf.Uninstall();
}
return pc;