rework langinfo code for ABI compat and for use by time code

[musl] / src / internal / arm / syscall.s

.global __syscall
.type __syscall,%function
__syscall:
        mov ip,sp
        stmfd sp!,{r4,r5,r6,r7}
        mov r7,r0
        mov r0,r1
        mov r1,r2
        mov r2,r3
        ldmfd ip,{r3,r4,r5,r6}
        svc 0
        ldmfd sp!,{r4,r5,r6,r7}
        tst lr,#1
        moveq pc,lr
        bx lr