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
 
 /*