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ARM: move PC value into r9

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Move the saved PC value into r9, thereby moving it into a caller-saved
register for functions that we may call during the entry to a syscall.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2017-03-24 16:22:10 +00:00
parent da594e3fff
commit fcea45236d
1 changed files with 7 additions and 0 deletions
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7
arch/arm/kernel/entry-common.S
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@ -28,7 +28,13 @@
#include "entry-header.S"
saved_psr .req r8
#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
saved_pc .req r9
#define TRACE(x...) x
#else
saved_pc .req lr
#define TRACE(x...)
#endif
.align 5
#if !(IS_ENABLED(CONFIG_TRACE_IRQFLAGS) || IS_ENABLED(CONFIG_CONTEXT_TRACKING))
@ -144,6 +150,7 @@ ENTRY(vector_swi)
THUMB( mov r8, sp )
THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
mrs saved_psr, spsr @ called from non-FIQ mode, so ok.
TRACE( mov saved_pc, lr )
str saved_pc, [sp, #S_PC] @ Save calling PC
str saved_psr, [sp, #S_PSR] @ Save CPSR
str r0, [sp, #S_OLD_R0] @ Save OLD_R0