Annotation of prex-old/include/arm/systrap.h, Revision 1.1.1.1
1.1 nbrk 1: /*
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 privillaged CPU mode. By this
41: * reason, all applications run in SYS mode with GBA.
42: *
43: * FIXME: 0x200007c -> should be defined in somewhere...
44: */
45:
46: #define SYSCALL0(name) \
47: .global name; .align; \
48: name##: \
49: stmfd sp!, {r4, r5, lr}; \
50: mov r4, #SYS_##name; \
51: ldr r5, =0x200007c; \
52: add lr, pc, #2; \
53: mov pc, r5; \
54: ldmfd sp!, {r4, r5, pc};
55:
56: #else
57:
58: #define SYSCALL0(name) \
59: .global name; .align; \
60: name##: swi #SYS_##name; \
61: mov pc, lr
62:
63: #endif
64:
65:
66: #define SYSCALL1(name) SYSCALL0(name)
67: #define SYSCALL2(name) SYSCALL0(name)
68: #define SYSCALL3(name) SYSCALL0(name)
69: #define SYSCALL4(name) SYSCALL0(name)
70:
71: #endif /* _ARM_SYSTRAP_H */
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