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-rw-r--r--arch/arm/kernel/entry-header.S31
1 files changed, 5 insertions, 26 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 051166c2a93..9a8531eadd3 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -121,15 +121,13 @@
.endm
#else /* CONFIG_THUMB2_KERNEL */
.macro svc_exit, rpsr
+ ldr lr, [sp, #S_SP] @ top of the stack
+ ldrd r0, r1, [sp, #S_LR] @ calling lr and pc
clrex @ clear the exclusive monitor
- ldr r0, [sp, #S_SP] @ top of the stack
- ldr r1, [sp, #S_PC] @ return address
- tst r0, #4 @ orig stack 8-byte aligned?
- stmdb r0, {r1, \rpsr} @ rfe context
+ stmdb lr!, {r0, r1, \rpsr} @ calling lr and rfe context
ldmia sp, {r0 - r12}
- ldr lr, [sp, #S_LR]
- addeq sp, sp, #S_FRAME_SIZE - 8 @ aligned
- addne sp, sp, #S_FRAME_SIZE - 4 @ not aligned
+ mov sp, lr
+ ldr lr, [sp], #4
rfeia sp!
.endm
@@ -165,25 +163,6 @@
.endm
#endif /* !CONFIG_THUMB2_KERNEL */
- @
- @ Debug exceptions are taken as prefetch or data aborts.
- @ We must disable preemption during the handler so that
- @ we can access the debug registers safely.
- @
- .macro debug_entry, fsr
-#if defined(CONFIG_HAVE_HW_BREAKPOINT) && defined(CONFIG_PREEMPT)
- ldr r4, =0x40f @ mask out fsr.fs
- and r5, r4, \fsr
- cmp r5, #2 @ debug exception
- bne 1f
- get_thread_info r10
- ldr r6, [r10, #TI_PREEMPT] @ get preempt count
- add r11, r6, #1 @ increment it
- str r11, [r10, #TI_PREEMPT]
-1:
-#endif
- .endm
-
/*
* These are the registers used in the syscall handler, and allow us to
* have in theory up to 7 arguments to a function - r0 to r6.