File: [local] / prex / include / arm / systrap.h (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:46:55 2008 UTC (16 years ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*
* Copyright (c) 2005, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARM_SYSTRAP_H
#define _ARM_SYSTRAP_H
#if defined(__gba__)
/*
* Note:
* GBA BIOS does not allow to an install SWI handler by user. So, the system
* calls will jump to the system call entry point (0x200007c) in the kernel
* code. Then, the kernel SWI handler will switch the CPU mode to SVC mode.
* However, CPU mode can be changed only in privileged CPU mode. By this
* reason, all applications run in SYS mode with GBA.
*
* FIXME: 0x200007c -> should be defined in somewhere...
*/
#define SYSCALL0(name) \
.global name; .align; \
name##: \
stmfd sp!, {r4, r5, lr}; \
mov r4, #SYS_##name; \
ldr r5, =0x200007c; \
add lr, pc, #2; \
mov pc, r5; \
ldmfd sp!, {r4, r5, pc};
#else
#define SYSCALL0(name) \
.global name; .align; \
name##: swi #SYS_##name; \
mov pc, lr
#endif
#define SYSCALL1(name) SYSCALL0(name)
#define SYSCALL2(name) SYSCALL0(name)
#define SYSCALL3(name) SYSCALL0(name)
#define SYSCALL4(name) SYSCALL0(name)
#endif /* _ARM_SYSTRAP_H */