LXR linux/arch/um/sys-x86_64/shared/sysdep/stub.h

   1/*
   2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
   3 * Licensed under the GPL
   4 */
   5
   6#ifndef __SYSDEP_STUB_H
   7#define __SYSDEP_STUB_H
   8
   9#include <sys/mman.h>
  10#include <asm/unistd.h>
  11#include <sysdep/ptrace_user.h>
  12#include "as-layout.h"
  13#include "stub-data.h"
  14#include "kern_constants.h"
  15
  16extern void stub_segv_handler(int sig);
  17extern void stub_clone_handler(void);
  18
  19#define STUB_SYSCALL_RET PT_INDEX(RAX)
  20#define STUB_MMAP_NR __NR_mmap
  21#define MMAP_OFFSET(o) (o)
  22
  23#define __syscall_clobber "r11","rcx","memory"
  24#define __syscall "syscall"
  25
  26static inline long stub_syscall0(long syscall)
  27{
  28        long ret;
  29
  30        __asm__ volatile (__syscall
  31                : "=a" (ret)
  32                : "0" (syscall) : __syscall_clobber );
  33
  34        return ret;
  35}
  36
  37static inline long stub_syscall2(long syscall, long arg1, long arg2)
  38{
  39        long ret;
  40
  41        __asm__ volatile (__syscall
  42                : "=a" (ret)
  43                : "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
  44
  45        return ret;
  46}
  47
  48static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  49{
  50        long ret;
  51
  52        __asm__ volatile (__syscall
  53                : "=a" (ret)
  54                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
  55                : __syscall_clobber );
  56
  57        return ret;
  58}
  59
  60static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  61                                 long arg4)
  62{
  63        long ret;
  64
  65        __asm__ volatile ("movq %5,%%r10 ; " __syscall
  66                : "=a" (ret)
  67                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
  68                  "g" (arg4)
  69                : __syscall_clobber, "r10" );
  70
  71        return ret;
  72}
  73
  74static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
  75                                 long arg4, long arg5)
  76{
  77        long ret;
  78
  79        __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
  80                : "=a" (ret)
  81                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
  82                  "g" (arg4), "g" (arg5)
  83                : __syscall_clobber, "r10", "r8" );
  84
  85        return ret;
  86}
  87
  88static inline void trap_myself(void)
  89{
  90        __asm("int3");
  91}
  92
  93static inline void remap_stack(long fd, unsigned long offset)
  94{
  95        __asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
  96                          "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
  97                          "movq %%rax, (%%rbx)":
  98                          : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
  99                            "S" (UM_KERN_PAGE_SIZE),
 100                            "d" (PROT_READ | PROT_WRITE),
 101                            "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
 102                            "g" (offset),
 103                            "i" (&((struct stub_data *) STUB_DATA)->err)
 104                          : __syscall_clobber, "r10", "r8", "r9" );
 105}
 106
 107#endif
 108