arch/um/include/sysdep-i386/stub.h

/*
 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
 * Licensed under the GPL
 */

#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H

#include <asm/ptrace.h>
#include <asm/unistd.h>

extern void stub_segv_handler(int sig);
extern void stub_clone_handler(void);

#define STUB_SYSCALL_RET EAX
#define STUB_MMAP_NR __NR_mmap2
#define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT)

static inline long stub_syscall1(long syscall, long arg1)
{
	long ret;

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));

	return ret;
}

static inline long stub_syscall2(long syscall, long arg1, long arg2)
{
	long ret;

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
			"c" (arg2));

	return ret;
}

static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
{
	long ret;

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
			"c" (arg2), "d" (arg3));

	return ret;
}

static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
				 long arg4)
{
	long ret;

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
			"c" (arg2), "d" (arg3), "S" (arg4));

	return ret;
}

static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
				 long arg4, long arg5)
{
	long ret;

	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));

	return ret;
}

static inline long stub_syscall6(long syscall, long arg1, long arg2, long arg3,
				 long arg4, long arg5, long arg6)
{
	long ret;

	__asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; "
			"int $0x80 ; pop %%ebp"
			: "=a" (ret)
			: "g" (syscall), "b" (arg1), "c" (arg2), "d" (arg3),
			  "S" (arg4), "D" (arg5), "0" (arg6));

	return ret;
}

static inline void trap_myself(void)
{
	__asm("int3");
}

#endif