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This commit is contained in:
matt 2013-08-19 02:36:27 +00:00
parent f66bbc4e80
commit de1d51c4ce
1 changed files with 18 additions and 2 deletions
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20
common/lib/libc/arch/arm/string/strrchr_naive.S
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@ -28,17 +28,33 @@
*/
#include <machine/asm.h>
RCSID("$NetBSD: strrchr_naive.S,v 1.2 2013/08/19 02:24:09 matt Exp $")
RCSID("$NetBSD: strrchr_naive.S,v 1.3 2013/08/19 02:36:27 matt Exp $")
/* LINTSTUB: char * strrchr(const char *, int) */
ENTRY(strrchr)
mov r2, r0 /* using r0 as return value */
mov r0, #0 /* default to no match */
movs r0, #0 /* default to no match */
#ifdef __thumb__
movs r3, #0xff
ands r1, r1, r3 /* restrict to a byte value */
1: ldrb r3, [r2] /* read a byte */
cmp r3, r1 /* does it match? */
bne 2f /* no, go and advance */
mov r0, r2 /* yes, set return value to point to it */
2: adds r2, r2, #1 /* advance to next byte */
#ifdef _ARM_ARCH_T2
cbnz r3, 1b /* was it a NUL? no, get next byte */
#else
cmp r3, #0 /* was it a NUL? */
bne 1b /* no, get next byte */
#endif
#else
and r1, r1, #0xff /* restrict to a byte value */
1: ldrb r3, [r2], #1 /* read a byte */
cmp r3, r1 /* does it match? */
subeq r0, r2, #1 /* yes, set return value to point to it */
cmp r3, #0 /* was it a NUL? */
bne 1b /* no, get next byte */
#endif
RET
END(strrchr)