NetBSD/sys/arch/sparc/stand/srt0.S

97 lines
1.2 KiB
ArmAsm
Raw Normal View History

1994-02-26 13:57:09 +03:00
#define CCFSZ 96
.file "str0.s"
.text
.globl start
start:
/*
* Set up a stack.
*/
set start, %o1
save %o1, -CCFSZ, %sp
/*
* Relocate.
*/
1: call 2f
nop
2: add %o7, (start-1b), %l0
set start, %l1
set _end, %o0
sub %o0, %l1, %l2 ! length
3: ld [%l0], %o0
add %l0, 4, %l0
st %o0, [%l1]
subcc %l2, 4, %l2
bg 3b
add %l1, 4, %l1
set 4f, %g1
jmp %g1
nop
4:
/*
* Clear BSS
*/
set _edata, %o0 ! bzero(edata, end - edata)
set _end, %o1
call _bzero
sub %o1, %o0, %o1
/*
* Save address of PROM vector (passed in %i0).
*/
sethi %hi(_promvec), %o0
st %i0, [%o0 + %lo(_promvec)]
/*
* That's it, really...
*/
call _main
mov %i0, %o0
ret
restore
/*
* XXX - Space saving .div & .rem routines (small & non-negative numbres only)
*/
.align 4
.global .div, .udiv
! int n = 0; while (a >= b) { a -= b; n++; }; return n;
.div:
.udiv:
cmp %o0, %o1
bl 2f
mov 0, %o5
1:
sub %o0, %o1, %o0
cmp %o0, %o1
bge 1b
add %o5, 1, %o5
2:
retl
mov %o5, %o0
.align 4
.global .rem, .urem
! while (a>=b) a -= b; return a;
.rem:
.urem:
cmp %o0, %o1
bl 2f
nop
sub %o0, %o1, %o0
1:
cmp %o0, %o1
bge,a 1b
sub %o0, %o1, %o0
2:
retl
nop