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authorCatalin Marinas <catalin.marinas@arm.com>2009-02-16 11:42:09 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-19 11:27:35 +0000
commitc4c5716e16c4ee971dec446a7e4801fbb8a1066b (patch)
treea1fb65c5b694bdc0b61bcd06371c2204968eb3b3 /arch
parent2e1926e7b5d39eb31880152d636e8d8d011888cb (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/entry-armv.S19
-rw-r--r--arch/arm/kernel/entry-common.S4
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 85040cfeb5e..d662a2f1fd8 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
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 49a6ba926c2..b8c1f141144 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -11,6 +11,7 @@
#include <asm/unistd.h>
#include <asm/ftrace.h>
#include <mach/entry-macro.S>
+#include <asm/unwind.h>
#include "entry-header.S"
@@ -22,6 +23,8 @@
* stack.
*/
ret_fast_syscall:
+ UNWIND(.fnstart )
+ UNWIND(.cantunwind )
disable_irq @ disable interrupts
ldr r1, [tsk, #TI_FLAGS]
tst r1, #_TIF_WORK_MASK
@@ -38,6 +41,7 @@ ret_fast_syscall:
mov r0, r0
add sp, sp, #S_FRAME_SIZE - S_PC
movs pc, lr @ return & move spsr_svc into cpsr
+ UNWIND(.fnend )
/*
* Ok, we need to do extra processing, enter the slow path.