1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/*
* libc/sysdeps/linux/v850/crt0.S -- Initial program entry point for linux/v850
*
* Copyright (C) 2001,2002 NEC Corporation
* Copyright (C) 2001,2002 Miles Bader <miles@gnu.org>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Miles Bader <miles@gnu.org>
*/
#include <clinkage.h>
/* Upon entry, the stack contains the following data:
argc, argv[0], ..., argv[argc-1], 0, envp[0], ..., 0
*/
.text
C_ENTRY(start):
ld.w 0[sp], r6 // Arg 0: argc
addi 4, sp, r7 // Arg 1: argv
mov r7, r8 // Arg 2: envp
mov r6, r10 // skip argc elements to get envp start
add 1, r10 // ...plus the NULL at the end of argv
shl 2, r10 // Convert to byte-count to skip
add r10, r8
// Zero bss area, since we can't rely upon any loader to do so
mov hilo(C_SYMBOL_NAME(edata)), ep
mov hilo(C_SYMBOL_NAME(end)), r10
2: cmp ep, r10
be 3f
sst.w r0, 0[ep]
add 4, ep
br 2b
// Load CTBP register
3: mov hilo(C_SYMBOL_NAME(_ctbp)), r19
ldsr r19, ctbp
// Load GP
mov hilo(C_SYMBOL_NAME(_gp)), gp
// call uclibc's startup routine
jarl C_SYMBOL_NAME(__uClibc_main), lp
// should never get here....
jr C_SYMBOL_NAME(abort)
|
