stub_32.h

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/*
 * Copyright (C) 2004 Jeff Dike ([email protected])
 * Licensed under the GPL
 */

#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H

#include <asm/ptrace.h>

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

static inline long stub_syscall0(long syscall)
{
    long ret;

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

    return ret;
}

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

static inline void remap_stack(int fd, unsigned long offset)
{
    __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
              "movl %7, %%ebx ; movl %%eax, (%%ebx)"
              : : "g" (STUB_MMAP_NR), "b" (STUB_DATA),
                "c" (UM_KERN_PAGE_SIZE),
                "d" (PROT_READ | PROT_WRITE),
                "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
                "a" (offset),
                "i" (&((struct stub_data *) STUB_DATA)->err)
              : "memory");
}

#endif