Commit d6316aae authored Feb 10, 2021 by Carlo Caione Committed by Anas Nashif Feb 10, 2021

aarch64: Fix corrupted IRQ state when tracing enabled



The call to sys_trace_idle() is potentially clobbering x0 resulting in a
wrong value being used by the following code. Save and restore x0 before
and after the call to sys_trace_idle() to avoid any issue.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Suggested-by: James Harris <james.harris@intel.com>

parent b88bfde8

arch/arm/core/aarch64/cpu_idle.S

+2 −2

Original line number	Diff line number	Diff line
		@@ -29,9 +29,9 @@ SECTION_FUNC(TEXT, arch_cpu_idle)
		GTEXT(arch_cpu_atomic_idle)
		SECTION_FUNC(TEXT, arch_cpu_atomic_idle)
		#ifdef CONFIG_TRACING
		stp xzr, x30, [sp, #-16]!
		stp x0, x30, [sp, #-16]!
		bl sys_trace_idle
		ldp xzr, x30, [sp], #16
		ldp x0, x30, [sp], #16
		#endif
		msr daifset, #(DAIFSET_IRQ)
		isb

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