scoutos / prex-0.9.0 / include / arm / systrap.h @ 03e9c04a
History | View | Annotate | Download (2.43 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 | #ifndef _ARM_SYSTRAP_H
|
||
31 | #define _ARM_SYSTRAP_H
|
||
32 | |||
33 | #if defined(__gba__)
|
||
34 | |||
35 | /*
|
||
36 | * Note:
|
||
37 | * GBA BIOS does not allow to an install SWI handler by user. So, the system
|
||
38 | * calls will jump to the system call entry point (0x200007c) in the kernel
|
||
39 | * code. Then, the kernel SWI handler will switch the CPU mode to SVC mode.
|
||
40 | * However, CPU mode can be changed only in privileged CPU mode. By this
|
||
41 | * reason, all applications run in SYS mode with GBA.
|
||
42 | *
|
||
43 | */
|
||
44 | |||
45 | #define SYSCALL0(name) \
|
||
46 | .global name; .align; \ |
||
47 | name##: \ |
||
48 | stmfd sp!, {r4, r5, lr}; \ |
||
49 | mov r4, #SYS_##name; \ |
||
50 | ldr r5, =0x200007c; \
|
||
51 | add lr, pc, #2; \
|
||
52 | mov pc, r5; \ |
||
53 | ldmfd sp!, {r4, r5, pc}; |
||
54 | |||
55 | #else
|
||
56 | |||
57 | #define SYSCALL0(name) \
|
||
58 | .global name; .align; \ |
||
59 | name##: swi #SYS_##name; \ |
||
60 | mov pc, lr |
||
61 | |||
62 | #endif
|
||
63 | |||
64 | |||
65 | #define SYSCALL1(name) SYSCALL0(name)
|
||
66 | #define SYSCALL2(name) SYSCALL0(name)
|
||
67 | #define SYSCALL3(name) SYSCALL0(name)
|
||
68 | #define SYSCALL4(name) SYSCALL0(name)
|
||
69 | |||
70 | #endif /* _ARM_SYSTRAP_H */ |