arch/um/include/sysdep-i386/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 <asm/ptrace.h>
  10 #include <asm/unistd.h>
  11
  12 extern void stub_segv_handler(int sig);
  13 extern void stub_clone_handler(void);
  14
  15 #define STUB_SYSCALL_RET EAX
  16 #define STUB_MMAP_NR __NR_mmap2
  17 #define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT)
  18
  19 static inline long stub_syscall2(long syscall, long arg1, long arg2)
  20 {
  21         long ret;
  22
  23         __asm__("movl %0, %%ecx; " : : "g" (arg2) : "%ecx");
  24         __asm__("movl %0, %%ebx; " : : "g" (arg1) : "%ebx");
  25         __asm__("movl %0, %%eax; " : : "g" (syscall) : "%eax");
  26         __asm__("int $0x80;" : : : "%eax");
  27         __asm__ __volatile__("movl %%eax, %0; " : "=g" (ret) :);
  28         return(ret);
  29 }
  30
  31 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  32 {
  33         __asm__("movl %0, %%edx; " : : "g" (arg3) : "%edx");
  34         return(stub_syscall2(syscall, arg1, arg2));
  35 }
  36
  37 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  38                                  long arg4)
  39 {
  40         __asm__("movl %0, %%esi; " : : "g" (arg4) : "%esi");
  41         return(stub_syscall3(syscall, arg1, arg2, arg3));
  42 }
  43
  44 static inline long stub_syscall6(long syscall, long arg1, long arg2, long arg3,
  45                                  long arg4, long arg5, long arg6)
  46 {
  47         long ret;
  48         __asm__("movl %0, %%eax; " : : "g" (syscall) : "%eax");
  49         __asm__("movl %0, %%ebx; " : : "g" (arg1) : "%ebx");
  50         __asm__("movl %0, %%ecx; " : : "g" (arg2) : "%ecx");
  51         __asm__("movl %0, %%edx; " : : "g" (arg3) : "%edx");
  52         __asm__("movl %0, %%esi; " : : "g" (arg4) : "%esi");
  53         __asm__("movl %0, %%edi; " : : "g" (arg5) : "%edi");
  54         __asm__ __volatile__("pushl %%ebp ; movl %1, %%ebp; "
  55                 "int $0x80; popl %%ebp ; "
  56                 "movl %%eax, %0; " : "=g" (ret) : "g" (arg6) : "%eax");
  57         return(ret);
  58 }
  59
  60 static inline void trap_myself(void)
  61 {
  62         __asm("int3");
  63 }
  64
  65 #endif