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ARM: entry: avoid clobbering R9 in IRQ handler

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Avoid using R9 in the IRQ handler code, as the entry code uses it for
tsk, and expects it to remain untouched between the IRQ entry and exit
code.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-01-24 19:36:03 +01:00
parent 75fa4adc4f
commit aa0a20f521
1 changed files with 4 additions and 5 deletions
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9
arch/arm/kernel/entry-armv.S
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@ -38,11 +38,10 @@
#ifdef CONFIG_UNWINDER_ARM
mov fpreg, sp @ Preserve original SP
#else
mov r8, fp @ Preserve original FP
mov r9, sp @ Preserve original SP
mov r7, fp @ Preserve original FP
mov r8, sp @ Preserve original SP
#endif
ldr_this_cpu sp, irq_stack_ptr, r2, r3
.if \from_user == 0
UNWIND( .setfp fpreg, sp )
@
@ -82,8 +81,8 @@ UNWIND( .setfp fpreg, sp )
#ifdef CONFIG_UNWINDER_ARM
mov sp, fpreg @ Restore original SP
#else
mov fp, r8 @ Restore original FP
mov sp, r9 @ Restore original SP
mov fp, r7 @ Restore original FP
mov sp, r8 @ Restore original SP
#endif // CONFIG_UNWINDER_ARM
#endif // CONFIG_IRQSTACKS
.endm