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ARM: findbit: add unwinder information

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Add unwinder information so oops in the findbit functions can create a
proper backtrace.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King (Oracle) 2022-08-11 17:03:29 +01:00
parent 2511d032f0
commit f424f2c184
1 changed files with 7 additions and 1 deletions
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8
arch/arm/lib/findbit.S
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@ -12,6 +12,7 @@
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/unwind.h>
.text
#ifdef __ARMEB__
@ -22,6 +23,7 @@
.macro find_first, endian, set, name
ENTRY(_find_first_\name\()bit_\endian)
UNWIND( .fnstart)
teq r1, #0
beq 3f
mov r2, #0
@ -41,11 +43,13 @@ ENTRY(_find_first_\name\()bit_\endian)
blo 1b
3: mov r0, r1 @ no more bits
ret lr
UNWIND( .fnend)
ENDPROC(_find_first_\name\()bit_\endian)
.endm
.macro find_next, endian, set, name
ENTRY(_find_next_\name\()bit_\endian)
UNWIND( .fnstart)
cmp r2, r1
bhs 3b
mov ip, r2, lsr #5 @ word index
@ -69,6 +73,7 @@ ENTRY(_find_next_\name\()bit_\endian)
orr r2, r2, #31 @ no zero bits
add r2, r2, #1 @ align bit pointer
b 2b @ loop for next bit
UNWIND( .fnend)
ENDPROC(_find_next_\name\()bit_\endian)
.endm
@ -97,6 +102,7 @@ ENDPROC(_find_next_\name\()bit_\endian)
* One or more bits in the LSB of r3 are assumed to be set.
*/
.L_found_swab:
UNWIND( .fnstart)
rev_l r3, ip
.L_found:
#if __LINUX_ARM_ARCH__ >= 7
@ -130,4 +136,4 @@ ENDPROC(_find_next_\name\()bit_\endian)
cmp r1, r0 @ Clamp to maxbit
movlo r0, r1
ret lr
UNWIND( .fnend)