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kern: optimize hw-single-step management

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Michael Scire
2021-07-27 14:05:32 -07:00
parent 6139b7d5ac
commit d7c93c44f4
7 changed files with 102 additions and 125 deletions
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21
mesosphere/kernel/source/arch/arm64/kern_k_scheduler_asm.s
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@@ -235,7 +235,26 @@ _ZN3ams4kern10KScheduler12ScheduleImplEv:
mov x0, x22
RESTORE_THREAD_CONTEXT(x0, x1, x2, 9f)
9: /* We're done restoring the thread context, and can return safely. */
9: /* Configure single-step, if we should. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)
/* Get a reference to the new thread's stack parameters. */
add x2, sp, #0x1000
and x2, x2, #~(0x1000-1)
/* Read the single-step flag. */
ldurb w2, [x2, #-(THREAD_STACK_PARAMETERS_SIZE - THREAD_STACK_PARAMETERS_IS_SINGLE_STEP)]
/* Update the single-step bit in mdscr_el1. */
mrs x1, mdscr_el1
bic x1, x1, #1
orr x1, x1, x2
msr mdscr_el1, x1
isb
#endif
/* We're done restoring the thread context, and can return safely. */
ret
10: /* Our switch failed. */