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stub.h

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

#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H

#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
#include "as-layout.h"
#include "stub-data.h"
#include "kern_constants.h"
#include "uml-config.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) >> 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

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