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psci: fix use of clobbered registers in asm

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The functions `psci_get_context_id` and `psci_get_target_pc`
are written in C, so the C compiler may clobber registers r0-r3.
Do not use these registers to save data across calls.

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
This commit is contained in:
Sam Edwards
2023-05-27 18:09:42 -06:00
committed by Tom Rini
parent 50195a2346
commit 8dc2c66680
1 changed files with 3 additions and 3 deletions
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6
arch/arm/cpu/armv7/psci.S
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@@ -311,11 +311,11 @@ ENTRY(psci_cpu_entry)
bl psci_arch_cpu_entry
bl psci_get_cpu_id @ CPU ID => r0
mov r2, r0 @ CPU ID => r2
bl psci_get_context_id @ context id => r0
mov r1, r0 @ context id => r1
mov r0, r2 @ CPU ID => r0
push {r0} @ save context id
bl psci_get_cpu_id @ CPU ID => r0
bl psci_get_target_pc @ target PC => r0
pop {r1} @ context id => r1
b _do_nonsec_entry
ENDPROC(psci_cpu_entry)