[ARM] 5385/2: unwind: Add unwinding information to exception entry points

This is needed to allow or stop the unwinding at certain points in the
kernel like exception entries.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 85040cfeb5e5..d662a2f1fd85 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -20,6 +20,7 @@
 #include <asm/vfpmacros.h>
 #include <mach/entry-macro.S>
 #include <asm/thread_notify.h>
+#include <asm/unwind.h>
 
 #include "entry-header.S"
 
@@ -123,6 +124,8 @@ ENDPROC(__und_invalid)
 #endif
 
         .macro  svc_entry, stack_hole=0
+ UNWIND(.fnstart                )
+ UNWIND(.save {r0 - pc}         )
         sub     sp, sp, #(S_FRAME_SIZE + \stack_hole)
  SPFIX( tst     sp, #4          )
  SPFIX( bicne   sp, sp, #4      )
@@ -196,6 +199,7 @@ __dabt_svc:
         ldr     r0, [sp, #S_PSR]
         msr     spsr_cxsf, r0
         ldmia   sp, {r0 - pc}^                  @ load r0 - pc, cpsr
+ UNWIND(.fnend          )
 ENDPROC(__dabt_svc)
 
         .align  5
@@ -228,6 +232,7 @@ __irq_svc:
         bleq    trace_hardirqs_on
 #endif
         ldmia   sp, {r0 - pc}^                  @ load r0 - pc, cpsr
+ UNWIND(.fnend          )
 ENDPROC(__irq_svc)
 
         .ltorg
@@ -278,6 +283,7 @@ __und_svc:
         ldr     lr, [sp, #S_PSR]                @ Get SVC cpsr
         msr     spsr_cxsf, lr
         ldmia   sp, {r0 - pc}^                  @ Restore SVC registers
+ UNWIND(.fnend          )
 ENDPROC(__und_svc)
 
         .align  5
@@ -320,6 +326,7 @@ __pabt_svc:
         ldr     r0, [sp, #S_PSR]
         msr     spsr_cxsf, r0
         ldmia   sp, {r0 - pc}^                  @ load r0 - pc, cpsr
+ UNWIND(.fnend          )
 ENDPROC(__pabt_svc)
 
         .align  5
@@ -343,6 +350,8 @@ ENDPROC(__pabt_svc)
 #endif
 
         .macro  usr_entry
+ UNWIND(.fnstart        )
+ UNWIND(.cantunwind     )       @ don't unwind the user space
         sub     sp, sp, #S_FRAME_SIZE
         stmib   sp, {r1 - r12}
 
@@ -420,6 +429,7 @@ __dabt_usr:
         mov     r2, sp
         adr     lr, ret_from_exception
         b       do_DataAbort
+ UNWIND(.fnend          )
 ENDPROC(__dabt_usr)
 
         .align  5
@@ -450,6 +460,7 @@ __irq_usr:
 
         mov     why, #0
         b       ret_to_user
+ UNWIND(.fnend          )
 ENDPROC(__irq_usr)
 
         .ltorg
@@ -484,6 +495,7 @@ __und_usr:
 #else
         b       __und_usr_unknown
 #endif
+ UNWIND(.fnend          )
 ENDPROC(__und_usr)
 
         @
@@ -671,14 +683,18 @@ __pabt_usr:
         enable_irq                              @ Enable interrupts
         mov     r1, sp                          @ regs
         bl      do_PrefetchAbort                @ call abort handler
+ UNWIND(.fnend          )
         /* fall through */
 /*
  * This is the return code to user mode for abort handlers
  */
 ENTRY(ret_from_exception)
+ UNWIND(.fnstart        )
+ UNWIND(.cantunwind     )
         get_thread_info tsk
         mov     why, #0
         b       ret_to_user
+ UNWIND(.fnend          )
 ENDPROC(__pabt_usr)
 ENDPROC(ret_from_exception)
 
@@ -688,6 +704,8 @@ ENDPROC(ret_from_exception)
  * previous and next are guaranteed not to be the same.
  */
 ENTRY(__switch_to)
+ UNWIND(.fnstart        )
+ UNWIND(.cantunwind     )
         add     ip, r1, #TI_CPU_SAVE
         ldr     r3, [r2, #TI_TP_VALUE]
         stmia   ip!, {r4 - sl, fp, sp, lr}      @ Store most regs on stack
@@ -717,6 +735,7 @@ ENTRY(__switch_to)
         bl      atomic_notifier_call_chain
         mov     r0, r5
         ldmia   r4, {r4 - sl, fp, sp, pc}       @ Load all regs saved previously
+ UNWIND(.fnend          )
 ENDPROC(__switch_to)
 
         __INIT