metalsvm/arch/x86/include/asm/syscall.h
2011-08-02 15:58:20 +02:00

91 lines
2.9 KiB
C

/*
* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
* RWTH Aachen University
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of MetalSVM.
*/
/**
* @author Stefan Lankes
* @file arch/x86/include/asm/syscall.h
* @brief Systemcall related code
*
* This file defines the syscall function and convenience
* based macro definitions for calling it.
*/
#ifndef __ARCH_SYSCALL_H__
#define __ARCH_SYSCALL_H__
#include <metalsvm/stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
#define _STR(token) #token
#define _SYSCALLSTR(x) "int $" _STR(x) " "
/** @brief the syscall function which issues an interrupt to the kernel
*
* It's supposed to be used by the macros defined in this file as the could would read
* cleaner then.
*
* @param nr System call number
* @param arg0 Argument 0
* @param arg1 Argument 1
* @param arg2 Argument 2
* @param arg3 Argument 3
* @param arg4 Argument 4
* @return The return value of the system call
*/
inline static long
syscall(int nr, unsigned long arg0, unsigned long arg1, unsigned long arg2,
unsigned long arg3, unsigned long arg4)
{
long res;
asm volatile (_SYSCALLSTR(INT_SYSCALL)
: "=a" (res)
: "0" (nr), "b" (arg0), "c" (arg1), "d" (arg2), "S" (arg3), "D" (arg4)
: "memory", "cc");
return res;
}
/// System call macro with one single argument; the syscall number
#define SYSCALL0(NR) \
syscall(NR, 0, 0, 0, 0, 0)
/// System call macro with system call number and one argument
#define SYSCALL1(NR, ARG1) \
syscall(NR, (unsigned long)ARG1, 0, 0, 0, 0)
/// System call macro with system call number and 2 arguments
#define SYSCALL2(NR, ARG1, ARG2) \
syscall(NR, (unsigned long)ARG1, (unsigned long)ARG2, 0, 0, 0)
/// System call macro with system call number and 3 arguments
#define SYSCALL3(NR, ARG1, ARG2, ARG3) \
syscall(NR, (unsigned long)ARG1, (unsigned long)ARG2, (unsigned long)ARG3, 0, 0)
/// System call macro with system call number and 4 arguments
#define SYSCALL4(NR, ARG1, ARG2, ARG3, ARG4) \
syscall(NR, (unsigned long)ARG1, (unsigned long)ARG2, (unsigned long)ARG3, (unsigned long) ARG4, 0)
/// System call macro with system call number and 5 arguments
#define SYSCALL5(NR, ARG1, ARG2, ARG3, ARG4) \
syscall(NR, (unsigned long)ARG1, (unsigned long)ARG2, (unsigned long)ARG3, (unsigned long) ARG4, (unsigned long) ARG5)
#ifdef __cplusplus
}
#endif
#endif