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kern: Add real SvcBreak implementation

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This commit is contained in:
Michael Scire 2020-07-31 00:04:43 -07:00 • committed by SciresM
parent 4c3c910774
commit 325802e29d
5 changed files with 160 additions and 11 deletions
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30
libraries/libmesosphere/source/arch/arm64/kern_k_debug.cpp
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@ -38,6 +38,36 @@ namespace ams::kern::arch::arm64 {
static_assert(ForbiddenWatchPointFlagsMask == 0xFFFFFFFF00F0E006ul);
}
uintptr_t KDebug::GetProgramCounter(const KThread &thread) {
return GetExceptionContext(std::addressof(thread))->pc;
}
void KDebug::SetPreviousProgramCounter() {
/* Get the current thread. */
KThread *thread = GetCurrentThreadPointer();
MESOSPHERE_ASSERT(thread->IsCallingSvc());
/* Get the exception context. */
KExceptionContext *e_ctx = GetExceptionContext(thread);
/* Set the previous pc. */
if (e_ctx->write == 0) {
/* Subtract from the program counter. */
if (thread->GetOwnerProcess()->Is64Bit()) {
e_ctx->pc -= sizeof(u32);
} else {
e_ctx->pc -= (e_ctx->psr & 0x20) ? sizeof(u16) : sizeof(u32);
}
/* Mark that we've set. */
e_ctx->write = 1;
}
}
Result KDebug::BreakIfAttached(ams::svc::BreakReason break_reason, uintptr_t address, size_t size) {
return KDebugBase::OnDebugEvent(ams::svc::DebugEvent_Exception, ams::svc::DebugException_UserBreak, GetProgramCounter(GetCurrentThread()), break_reason, address, size);
}
#define MESOSPHERE_SET_HW_BREAK_POINT(ID, FLAGS, VALUE) \
({ \
cpu::SetDbgBcr##ID##El1(0); \