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-rw-r--r--arch/avr32/kernel/entry-avr32b.S26
1 files changed, 25 insertions, 1 deletions
diff --git a/arch/avr32/kernel/entry-avr32b.S b/arch/avr32/kernel/entry-avr32b.S
index 42657f1..ccadfd9 100644
--- a/arch/avr32/kernel/entry-avr32b.S
+++ b/arch/avr32/kernel/entry-avr32b.S
@@ -159,11 +159,18 @@ handle_vmalloc_miss:
.section .scall.text,"ax",@progbits
system_call:
+#ifdef CONFIG_PREEMPT
+ mask_interrupts
+#endif
pushm r12 /* r12_orig */
stmts --sp, r0-lr
- zero_fp
+
mfsr r0, SYSREG_RAR_SUP
mfsr r1, SYSREG_RSR_SUP
+#ifdef CONFIG_PREEMPT
+ unmask_interrupts
+#endif
+ zero_fp
stm --sp, r0-r1
/* check for syscall tracing */
@@ -638,6 +645,13 @@ irq_level\level:
stmts --sp,r0-lr
mfsr r8, rar_int\level
mfsr r9, rsr_int\level
+
+#ifdef CONFIG_PREEMPT
+ sub r11, pc, (. - system_call)
+ cp.w r11, r8
+ breq 4f
+#endif
+
pushm r8-r9
mov r11, sp
@@ -668,6 +682,16 @@ irq_level\level:
sub sp, -4 /* ignore r12_orig */
rete
+#ifdef CONFIG_PREEMPT
+4: mask_interrupts
+ mfsr r8, rsr_int\level
+ sbr r8, 16
+ mtsr rsr_int\level, r8
+ ldmts sp++, r0-lr
+ sub sp, -4 /* ignore r12_orig */
+ rete
+#endif
+
2: get_thread_info r0
ld.w r1, r0[TI_flags]
bld r1, TIF_CPU_GOING_TO_SLEEP
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