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authorLaura Abbott <lauraa@codeaurora.org>2011-05-27 18:23:16 +0200
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-05-27 23:56:53 +0200
commit81479c246c07b703aeb4bf54933b7d928cb5b717 (patch)
tree2ad7888a68ad944292c455d2ee4fc242bcc79a5c /arch/arm/lib
parentARM: 6944/1: mm: allow ASID 0 to be allocated to tasks (diff)
downloadlinux-81479c246c07b703aeb4bf54933b7d928cb5b717.tar.xz
linux-81479c246c07b703aeb4bf54933b7d928cb5b717.zip
ARM: 6945/1: Add unwinding support for division functions
The software division functions never had unwinding annotations added. Currently, when a division by zero occurs the backtrace shown will stop at Ldiv0 or some completely unrelated function. Add unwinding annotations in hopes of getting a more useful backtrace when a division by zero occurs. Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Acked-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/lib1funcs.S25
1 files changed, 20 insertions, 5 deletions
diff --git a/arch/arm/lib/lib1funcs.S b/arch/arm/lib/lib1funcs.S
index 6dc06487f3c3..c562f649734c 100644
--- a/arch/arm/lib/lib1funcs.S
+++ b/arch/arm/lib/lib1funcs.S
@@ -35,7 +35,7 @@ Boston, MA 02111-1307, USA. */
#include <linux/linkage.h>
#include <asm/assembler.h>
-
+#include <asm/unwind.h>
.macro ARM_DIV_BODY dividend, divisor, result, curbit
@@ -207,6 +207,7 @@ Boston, MA 02111-1307, USA. */
ENTRY(__udivsi3)
ENTRY(__aeabi_uidiv)
+UNWIND(.fnstart)
subs r2, r1, #1
moveq pc, lr
@@ -230,10 +231,12 @@ ENTRY(__aeabi_uidiv)
mov r0, r0, lsr r2
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__udivsi3)
ENDPROC(__aeabi_uidiv)
ENTRY(__umodsi3)
+UNWIND(.fnstart)
subs r2, r1, #1 @ compare divisor with 1
bcc Ldiv0
@@ -247,10 +250,12 @@ ENTRY(__umodsi3)
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__umodsi3)
ENTRY(__divsi3)
ENTRY(__aeabi_idiv)
+UNWIND(.fnstart)
cmp r1, #0
eor ip, r0, r1 @ save the sign of the result.
@@ -287,10 +292,12 @@ ENTRY(__aeabi_idiv)
rsbmi r0, r0, #0
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__divsi3)
ENDPROC(__aeabi_idiv)
ENTRY(__modsi3)
+UNWIND(.fnstart)
cmp r1, #0
beq Ldiv0
@@ -310,11 +317,14 @@ ENTRY(__modsi3)
rsbmi r0, r0, #0
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__modsi3)
#ifdef CONFIG_AEABI
ENTRY(__aeabi_uidivmod)
+UNWIND(.fnstart)
+UNWIND(.save {r0, r1, ip, lr} )
stmfd sp!, {r0, r1, ip, lr}
bl __aeabi_uidiv
@@ -323,10 +333,12 @@ ENTRY(__aeabi_uidivmod)
sub r1, r1, r3
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__aeabi_uidivmod)
ENTRY(__aeabi_idivmod)
-
+UNWIND(.fnstart)
+UNWIND(.save {r0, r1, ip, lr} )
stmfd sp!, {r0, r1, ip, lr}
bl __aeabi_idiv
ldmfd sp!, {r1, r2, ip, lr}
@@ -334,15 +346,18 @@ ENTRY(__aeabi_idivmod)
sub r1, r1, r3
mov pc, lr
+UNWIND(.fnend)
ENDPROC(__aeabi_idivmod)
#endif
Ldiv0:
-
+UNWIND(.fnstart)
+UNWIND(.pad #4)
+UNWIND(.save {lr})
str lr, [sp, #-8]!
bl __div0
mov r0, #0 @ About as wrong as it could be.
ldr pc, [sp], #8
-
-
+UNWIND(.fnend)
+ENDPROC(Ldiv0)