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Diffstat (limited to 'arch/arm/kernel/entry-header.S')
-rw-r--r--arch/arm/kernel/entry-header.S66
1 files changed, 64 insertions, 2 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 9a8531eadd3..160f3376ba6 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -74,7 +74,24 @@
.endm
#ifndef CONFIG_THUMB2_KERNEL
- .macro svc_exit, rpsr
+ .macro svc_exit, rpsr, irq = 0
+ .if \irq != 0
+ @ IRQs already off
+#ifdef CONFIG_TRACE_IRQFLAGS
+ @ The parent context IRQs must have been enabled to get here in
+ @ the first place, so there's no point checking the PSR I bit.
+ bl trace_hardirqs_on
+#endif
+ .else
+ @ IRQs off again before pulling preserved data off the stack
+ disable_irq_notrace
+#ifdef CONFIG_TRACE_IRQFLAGS
+ tst \rpsr, #PSR_I_BIT
+ bleq trace_hardirqs_on
+ tst \rpsr, #PSR_I_BIT
+ blne trace_hardirqs_off
+#endif
+ .endif
msr spsr_cxsf, \rpsr
#if defined(CONFIG_CPU_V6)
ldr r0, [sp]
@@ -120,7 +137,24 @@
mov pc, \reg
.endm
#else /* CONFIG_THUMB2_KERNEL */
- .macro svc_exit, rpsr
+ .macro svc_exit, rpsr, irq = 0
+ .if \irq != 0
+ @ IRQs already off
+#ifdef CONFIG_TRACE_IRQFLAGS
+ @ The parent context IRQs must have been enabled to get here in
+ @ the first place, so there's no point checking the PSR I bit.
+ bl trace_hardirqs_on
+#endif
+ .else
+ @ IRQs off again before pulling preserved data off the stack
+ disable_irq_notrace
+#ifdef CONFIG_TRACE_IRQFLAGS
+ tst \rpsr, #PSR_I_BIT
+ bleq trace_hardirqs_on
+ tst \rpsr, #PSR_I_BIT
+ blne trace_hardirqs_off
+#endif
+ .endif
ldr lr, [sp, #S_SP] @ top of the stack
ldrd r0, r1, [sp, #S_LR] @ calling lr and pc
clrex @ clear the exclusive monitor
@@ -164,6 +198,34 @@
#endif /* !CONFIG_THUMB2_KERNEL */
/*
+ * Context tracking subsystem. Used to instrument transitions
+ * between user and kernel mode.
+ */
+ .macro ct_user_exit, save = 1
+#ifdef CONFIG_CONTEXT_TRACKING
+ .if \save
+ stmdb sp!, {r0-r3, ip, lr}
+ bl user_exit
+ ldmia sp!, {r0-r3, ip, lr}
+ .else
+ bl user_exit
+ .endif
+#endif
+ .endm
+
+ .macro ct_user_enter, save = 1
+#ifdef CONFIG_CONTEXT_TRACKING
+ .if \save
+ stmdb sp!, {r0-r3, ip, lr}
+ bl user_enter
+ ldmia sp!, {r0-r3, ip, lr}
+ .else
+ bl user_enter
+ .endif
+#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.
*