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

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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>
This commit is contained in:
Catalin Marinas 2009-02-16 11:42:09 +01:00 committed by Russell King
parent 2e1926e7b5
commit c4c5716e16
2 changed files with 23 additions and 0 deletions
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19
arch/arm/kernel/entry-armv.S
View File

@ -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

4
arch/arm/kernel/entry-common.S
View File

@ -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.