root / prex-0.9.0 / usr / arch / ppc / _crt0.S @ 03e9c04a
History | View | Annotate | Download (2.06 KB)
1 | 03e9c04a | Brad Neuman | /*- |
---|---|---|---|
2 | * Copyright (c) 2005, Kohsuke Ohtani |
||
3 | * All rights reserved. |
||
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * 1. Redistributions of source code must retain the above copyright |
||
9 | * notice, this list of conditions and the following disclaimer. |
||
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 | * 3. Neither the name of the author nor the names of any co-contributors |
||
14 | * may be used to endorse or promote products derived from this software |
||
15 | * without specific prior written permission. |
||
16 | * |
||
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
||
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
||
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
||
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
||
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
||
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
||
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
||
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
||
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
||
27 | * SUCH DAMAGE. |
||
28 | */ |
||
29 | |||
30 | /* |
||
31 | * crt0.S - C startup routine |
||
32 | */ |
||
33 | |||
34 | /** |
||
35 | * Stack layout: |
||
36 | * argc argument counter (integer) |
||
37 | * argv[0] program name (pointer) |
||
38 | * argv[1...N] program args (pointers) |
||
39 | * argv[argc-1] end of args (integer) |
||
40 | * NULL |
||
41 | * env[0...N] environment variables (pointers) |
||
42 | * NULL |
||
43 | */ |
||
44 | |||
45 | /* |
||
46 | * Entry point called by kernel first |
||
47 | */ |
||
48 | .text |
||
49 | .global _start |
||
50 | _start: |
||
51 | lwz r3, 0(r1) |
||
52 | addi r4, r1, 4 |
||
53 | slwi r5, r3, 2 |
||
54 | add r5, r5, r4 |
||
55 | subi r1, r1, 8 /* adjust stack to call C function */ |
||
56 | b __prex_main |