[Prex-devel] sp pointer in umem_* functions

[pradeep s. <pra...@gm...>]

Hello ,
I was going through umem_strnlen function defined in sys/arch/arm/arm/locore.S :

	mov	r12, sp
 	stmdb	sp!, {r4, r11, r12, lr, pc}
	mov	r4, r0
 	sub	r11, r12, #4
	cmp	r0, #(UMEM_MAX)
	bhi	umem_fault
	b	2f
1:	add	r0, r0, #1
2: 	subs	r1, r1, #1
 	bcc	3f
known_fault3:				/* May be fault here */
 	ldrb	r3, [r0]
	cmp	r3, #0
 	bne	1b
3: 	rsb	r0, r4, r0
	str	r0, [r2]
	mov	r0, #0			/* Set no error */
 	ldmia	sp, {r4, r11, sp, pc}