linux/mips/raw_syscall.h

/*
 * Raw syscalls.
 *
 * Copyright (c) 2018 The strace developers.
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 STRACE_RAW_SYSCALL_H
#define STRACE_RAW_SYSCALL_H

# include "kernel_types.h"

static inline kernel_ulong_t
raw_syscall_0(const kernel_ulong_t nr, kernel_ulong_t *err)
{
	register kernel_ulong_t s0 __asm__("$16") = nr;
	register kernel_ulong_t v0 __asm__("$2");
	register kernel_ulong_t a3 __asm__("$7");
	__asm__ __volatile__(".set noreorder\n\t"
			     "move %0, %2\n\t"
			     "syscall\n\t"
			     ".set reorder"
			     : "=r"(v0), "=r"(a3)
			     : "r"(s0)
			     : "memory", "hi", "lo", "$1", "$3", "$8", "$9",
			       "$10", "$11", "$12", "$13", "$14", "$15",
			       "$24", "$25");
	*err = a3;
	return v0;
}
# define raw_syscall_0 raw_syscall_0

#endif /* !STRACE_RAW_SYSCALL_H */