arch/x86/um/shared/sysdep/stub_32.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 <asm/ptrace.h>
  10
  11 #define STUB_SYSCALL_RET EAX
  12 #define STUB_MMAP_NR __NR_mmap2
  13 #define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
  14
  15 static inline long stub_syscall0(long syscall)
  16 {
  17         long ret;
  18
  19         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
  20
  21         return ret;
  22 }
  23
  24 static inline long stub_syscall1(long syscall, long arg1)
  25 {
  26         long ret;
  27
  28         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
  29
  30         return ret;
  31 }
  32
  33 static inline long stub_syscall2(long syscall, long arg1, long arg2)
  34 {
  35         long ret;
  36
  37         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  38                         "c" (arg2));
  39
  40         return ret;
  41 }
  42
  43 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  44 {
  45         long ret;
  46
  47         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  48                         "c" (arg2), "d" (arg3));
  49
  50         return ret;
  51 }
  52
  53 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  54                                  long arg4)
  55 {
  56         long ret;
  57
  58         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  59                         "c" (arg2), "d" (arg3), "S" (arg4));
  60
  61         return ret;
  62 }
  63
  64 static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
  65                                  long arg4, long arg5)
  66 {
  67         long ret;
  68
  69         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  70                         "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
  71
  72         return ret;
  73 }
  74
  75 static inline void trap_myself(void)
  76 {
  77         __asm("int3");
  78 }
  79
  80 static inline void remap_stack(int fd, unsigned long offset)
  81 {
  82         __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
  83                           "movl %7, %%ebx ; movl %%eax, (%%ebx)"
  84                           : : "g" (STUB_MMAP_NR), "b" (STUB_DATA),
  85                             "c" (UM_KERN_PAGE_SIZE),
  86                             "d" (PROT_READ | PROT_WRITE),
  87                             "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
  88                             "a" (offset),
  89                             "i" (&((struct stub_data *) STUB_DATA)->err)
  90                           : "memory");
  91 }
  92
  93 #endif