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}
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