source: trunk/libs/newlib/src/libgloss/microblaze/pgcrtinit.S @ 543

Last change on this file since 543 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 3.1 KB
Line 
1## Copyright (c) 2001, 2009 Xilinx, Inc.  All rights reserved.
2##
3## Redistribution and use in source and binary forms, with or without
4## modification, are permitted provided that the following conditions are
5## met:
6##
7## 1.  Redistributions source code must retain the above copyright notice,
8## this list of conditions and the following disclaimer.
9##
10## 2.  Redistributions in binary form must reproduce the above copyright
11## notice, this list of conditions and the following disclaimer in the
12## documentation and/or other materials provided with the distribution.
13##
14## 3.  Neither the name of Xilinx nor the names of its contributors may be
15## used to endorse or promote products derived from this software without
16## specific prior written permission.
17##
18## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS
19## IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20## TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
21## PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22## HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
24## TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25## PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26## LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27## NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28## SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 
30
31        .globl _crtinit
32        .align 2
33        .ent _crtinit
34
35_crtinit:
36        addi    r1, r1, -20                     /* Save Link register    */
37        swi     r15, r1, 0
38
39        addi    r6, r0, __sbss_start            /* clear SBSS */
40        addi    r7, r0, __sbss_end     
41        rsub    r18, r6, r7             
42        blei    r18, .Lendsbss
43
44.Lloopsbss:     
45        swi     r0, r6, 0
46        addi    r6, r6, 4
47        rsub    r18, r6, r7
48        bgti    r18, .Lloopsbss
49.Lendsbss:
50
51        addi    r6, r0, __bss_start             /* clear BSS */
52        addi    r7, r0, __bss_end               
53        rsub    r18, r6, r7             
54        blei    r18, .Lendbss
55.Lloopbss:     
56        swi     r0, r6, 0
57        addi    r6, r6, 4
58        rsub    r18, r6, r7
59        bgti    r18, .Lloopbss
60.Lendbss:
61
62        brlid   r15, _program_init              /* Initialize the program */
63        nop
64
65        brlid   r15, _profile_init              /* Initialize profiling library */
66        nop
67
68        brlid   r15, __init                     /* Invoke language initialization functions */
69        nop
70   
71        addi    r6, r0, 0                       /* Initialize argc = 1 and argv = NULL and envp = NULL  */
72        addi    r7, r0, 0                       
73        brlid   r15, main                       /* Execute the program */
74        addi    r5, r0, 0                       
75
76        addik   r19, r3, 0                      /* Save return value */
77   
78        brlid   r15, __fini                     /* Invoke language cleanup functions */
79        nop
80
81        brlid   r15, _profile_clean             /* Cleanup profiling library */
82        nop
83   
84        brlid   r15, _program_clean             /* Cleanup the program */
85        nop
86
87        lw      r15, r1, r0                     /* Return back to CRT */
88        addik   r3, r19, 0                      /* Restore return value */ 
89        rtsd    r15, 8
90        addi    r1, r1, 20
91        .end _crtinit
92
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