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Code Issues Releases Activity

kern: improve single-step around user-exception entry

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This commit is contained in:
Michael Scire 2021-07-27 15:09:36 -07:00
parent 325ae30067
commit 999318838f
2 changed files with 11 additions and 11 deletions
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17
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
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@ -109,13 +109,9 @@ namespace ams::kern::arch::arm64 {
break; break;
} }
/* If we should, clear the thread's state as single-step. */ /* In the event that we return from this exception, we want SPSR.SS set so that we advance an instruction if single-stepping. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP) #if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
if (AMS_UNLIKELY(GetCurrentThread().IsSingleStep())) { context->psr |= (1ul << 21);
GetCurrentThread().ClearSingleStep();
cpu::MonitorDebugSystemControlRegisterAccessor().SetSoftwareStep(false).Store();
cpu::EnsureInstructionConsistency();
}
#endif #endif
/* If we should process the user exception (and it's not a breakpoint), try to enter. */ /* If we should process the user exception (and it's not a breakpoint), try to enter. */
@ -224,6 +220,15 @@ namespace ams::kern::arch::arm64 {
} }
} }
/* If we should, clear the thread's state as single-step. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
if (AMS_UNLIKELY(GetCurrentThread().IsSingleStep())) {
GetCurrentThread().ClearSingleStep();
cpu::MonitorDebugSystemControlRegisterAccessor().SetSoftwareStep(false).Store();
cpu::EnsureInstructionConsistency();
}
#endif
{ {
/* Collect additional information based on the ec. */ /* Collect additional information based on the ec. */
ams::svc::DebugException exception; ams::svc::DebugException exception;

5
mesosphere/kernel/source/arch/arm64/kern_exception_handlers_asm.s
View file

@ -217,11 +217,6 @@ _ZN3ams4kern4arch5arm6430EL0SynchronousExceptionHandlerEv:
ldp x21, x22, [sp, #(EXCEPTION_CONTEXT_PC_PSR)] ldp x21, x22, [sp, #(EXCEPTION_CONTEXT_PC_PSR)]
ldr x23, [sp, #(EXCEPTION_CONTEXT_TPIDR)] ldr x23, [sp, #(EXCEPTION_CONTEXT_TPIDR)]
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
/* Since we're returning from an exception, set SPSR.SS so that we advance an instruction if single-stepping. */
orr x22, x22, #(1 << 21)
#endif
msr sp_el0, x20 msr sp_el0, x20
msr elr_el1, x21 msr elr_el1, x21
msr spsr_el1, x22 msr spsr_el1, x22