X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=arch%2Farc%2Fkernel%2Fentry-compact.S;h=431433929189c8b63e8b3efe41ef03030fa8b86f;hb=2113caed87dd372e5ca2d9b3cba415f4da38936b;hp=59f52035b4ea34a582b50b80e5db48893c1dc7bf;hpb=6a177af775d92cff7ef36a681c304dc750dbe121;p=deliverable%2Flinux.git

diff --git a/arch/arc/kernel/entry-compact.S b/arch/arc/kernel/entry-compact.S
index 59f52035b4ea..0cb0abaa0479 100644
--- a/arch/arc/kernel/entry-compact.S
+++ b/arch/arc/kernel/entry-compact.S
@@ -142,16 +142,12 @@ int1_saved_reg:
 	.zero 4
 
 /* Each Interrupt level needs its own scratch */
-#ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
-
 ARCFP_DATA int2_saved_reg
 	.type   int2_saved_reg, @object
 	.size   int2_saved_reg, 4
 int2_saved_reg:
 	.zero 4
 
-#endif
-
 ; ---------------------------------------------
 	.section .text, "ax",@progbits
 
@@ -215,6 +211,31 @@ END(handle_interrupt_level2)
 
 #endif
 
+; ---------------------------------------------
+; User Mode Memory Bus Error Interrupt Handler
+; (Kernel mode memory errors handled via seperate exception vectors)
+; ---------------------------------------------
+ENTRY(mem_service)
+
+	INTERRUPT_PROLOGUE 2
+
+	mov r0, ilink2
+	mov r1, sp
+
+	; User process needs to be killed with SIGBUS, but first need to get
+	; out of the L2 interrupt context (drop to pure kernel mode) and jump
+	; off to "C" code where SIGBUS in enqueued
+	lr  r3, [status32]
+	bclr r3, r3, STATUS_A2_BIT
+	or  r3, r3, (STATUS_E1_MASK|STATUS_E2_MASK)
+	sr  r3, [status32_l2]
+	mov ilink2, 1f
+	rtie
+1:
+	bl  do_memory_error
+	b   ret_from_exception
+END(mem_service)
+
 ; ---------------------------------------------
 ;  Level 1 ISR
 ; ---------------------------------------------
@@ -320,6 +341,9 @@ END(call_do_page_fault)
 
 .Lrestore_regs:
 
+	# Interrpts are actually disabled from this point on, but will get
+	# reenabled after we return from interrupt/exception.
+	# But irq tracer needs to be told now...
 	TRACE_ASM_IRQ_ENABLE
 
 	lr	r10, [status32]