Add a prefetch abort handler

This patch adds a prefetch abort handler similar to the data abort one
and renames the latter for consistency. Initial implementation by Paul
Brook with some renaming by Catalin Marinas.

Signed-off-by: Paul Brook <paul@codesourcery.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

3 files changed, 36 insertions, 10 deletions

diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 6604b474cfd7..0a0d2479274b 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -111,5 +111,12 @@ int main(void)
   DEFINE(PROCINFO_INITFUNC,	offsetof(struct proc_info_list, __cpu_flush));
   DEFINE(PROCINFO_MM_MMUFLAGS,	offsetof(struct proc_info_list, __cpu_mm_mmu_flags));
   DEFINE(PROCINFO_IO_MMUFLAGS,	offsetof(struct proc_info_list, __cpu_io_mmu_flags));
+  BLANK();
+#ifdef MULTI_DABORT
+  DEFINE(PROCESSOR_DABT_FUNC,	offsetof(struct processor, _data_abort));
+#endif
+#ifdef MULTI_PABORT
+  DEFINE(PROCESSOR_PABT_FUNC,	offsetof(struct processor, _prefetch_abort));
+#endif
   return 0; 
 }
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index a46d5b456765..5e647eb6b3b9 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -166,12 +166,12 @@ __dabt_svc:
 	@ The abort handler must return the aborted address in r0, and
 	@ the fault status register in r1.  r9 must be preserved.
 	@
-#ifdef MULTI_ABORT
+#ifdef MULTI_DABORT
 	ldr	r4, .LCprocfns
 	mov	lr, pc
-	ldr	pc, [r4]
+	ldr	pc, [r4, #PROCESSOR_DABT_FUNC]
 #else
-	bl	CPU_ABORT_HANDLER
+	bl	CPU_DABORT_HANDLER
 #endif
 
 	@
@@ -293,7 +293,6 @@ __pabt_svc:
 	mrs	r9, cpsr
 	tst	r3, #PSR_I_BIT
 	biceq	r9, r9, #PSR_I_BIT
-	msr	cpsr_c, r9
 
 	@
 	@ set args, then call main handler
@@ -301,7 +300,15 @@ __pabt_svc:
 	@  r0 - address of faulting instruction
 	@  r1 - pointer to registers on stack
 	@
-	mov	r0, r2				@ address (pc)
+#ifdef MULTI_PABORT
+	mov	r0, r2			@ pass address of aborted instruction.
+	ldr	r4, .LCprocfns
+	mov	lr, pc
+	ldr	pc, [r4, #PROCESSOR_PABT_FUNC]
+#else
+	CPU_PABORT_HANDLER(r0, r2)
+#endif
+	msr	cpsr_c, r9			@ Maybe enable interrupts
 	mov	r1, sp				@ regs
 	bl	do_PrefetchAbort		@ call abort handler
 
@@ -320,7 +327,7 @@ __pabt_svc:
 	.align	5
 .LCcralign:
 	.word	cr_alignment
-#ifdef MULTI_ABORT
+#ifdef MULTI_DABORT
 .LCprocfns:
 	.word	processor
 #endif
@@ -404,12 +411,12 @@ __dabt_usr:
 	@ The abort handler must return the aborted address in r0, and
 	@ the fault status register in r1.
 	@
-#ifdef MULTI_ABORT
+#ifdef MULTI_DABORT
 	ldr	r4, .LCprocfns
 	mov	lr, pc
-	ldr	pc, [r4]
+	ldr	pc, [r4, #PROCESSOR_DABT_FUNC]
 #else
-	bl	CPU_ABORT_HANDLER
+	bl	CPU_DABORT_HANDLER
 #endif
 
 	@
@@ -619,8 +626,15 @@ __und_usr_unknown:
 __pabt_usr:
 	usr_entry
 
+#ifdef MULTI_PABORT
+	mov	r0, r2			@ pass address of aborted instruction.
+	ldr	r4, .LCprocfns
+	mov	lr, pc
+	ldr	pc, [r4, #PROCESSOR_PABT_FUNC]
+#else
+	CPU_PABORT_HANDLER(r0, r2)
+#endif
 	enable_irq				@ Enable interrupts
-	mov	r0, r2				@ address (pc)
 	mov	r1, sp				@ regs
 	bl	do_PrefetchAbort		@ call abort handler
 	/* fall through */
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 6c90c50a9ee3..597ed00a08d8 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -352,6 +352,11 @@ sys_mmap2:
 		b	do_mmap2
 #endif
 
+ENTRY(pabort_ifar)
+		mrc	p15, 0, r0, cr6, cr0, 2
+ENTRY(pabort_noifar)
+		mov	pc, lr
+
 #ifdef CONFIG_OABI_COMPAT
 
 /*