scoutos / prex-0.9.0 / include / arm / systrap.h @ 03e9c04a
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/*
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* Copyright (c) 2005, Kohsuke Ohtani
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ARM_SYSTRAP_H
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#define _ARM_SYSTRAP_H
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#if defined(__gba__)
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/*
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* Note:
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* GBA BIOS does not allow to an install SWI handler by user. So, the system
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* calls will jump to the system call entry point (0x200007c) in the kernel
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* code. Then, the kernel SWI handler will switch the CPU mode to SVC mode.
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* However, CPU mode can be changed only in privileged CPU mode. By this
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* reason, all applications run in SYS mode with GBA.
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*
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*/
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#define SYSCALL0(name) \
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.global name; .align; \ |
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name##: \ |
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stmfd sp!, {r4, r5, lr}; \ |
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mov r4, #SYS_##name; \ |
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ldr r5, =0x200007c; \
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add lr, pc, #2; \
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mov pc, r5; \ |
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ldmfd sp!, {r4, r5, pc}; |
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#else
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#define SYSCALL0(name) \
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.global name; .align; \ |
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name##: swi #SYS_##name; \ |
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mov pc, lr |
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#endif
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#define SYSCALL1(name) SYSCALL0(name)
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#define SYSCALL2(name) SYSCALL0(name)
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#define SYSCALL3(name) SYSCALL0(name)
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#define SYSCALL4(name) SYSCALL0(name)
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#endif /* _ARM_SYSTRAP_H */ |