arch/um/include/sysdep-x86_64/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 #include <sysdep/ptrace_user.h>
  12
  13 extern void stub_segv_handler(int sig);
  14 extern void stub_clone_handler(void);
  15
  16 #define STUB_SYSCALL_RET PT_INDEX(RAX)
  17 #define STUB_MMAP_NR __NR_mmap
  18 #define MMAP_OFFSET(o) (o)
  19
  20 static inline long stub_syscall2(long syscall, long arg1, long arg2)
  21 {
  22         long ret;
  23
  24         __asm__("movq %0, %%rsi; " : : "g" (arg2) : "%rsi");
  25         __asm__("movq %0, %%rdi; " : : "g" (arg1) : "%rdi");
  26         __asm__("movq %0, %%rax; " : : "g" (syscall) : "%rax");
  27         __asm__("syscall;" : : : "%rax", "%r11", "%rcx");
  28         __asm__ __volatile__("movq %%rax, %0; " : "=g" (ret) :);
  29         return(ret);
  30 }
  31
  32 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  33 {
  34         __asm__("movq %0, %%rdx; " : : "g" (arg3) : "%rdx");
  35         return(stub_syscall2(syscall, arg1, arg2));
  36 }
  37
  38 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  39                                  long arg4)
  40 {
  41         __asm__("movq %0, %%r10; " : : "g" (arg4) : "%r10");
  42         return(stub_syscall3(syscall, arg1, arg2, arg3));
  43 }
  44
  45 static inline long stub_syscall6(long syscall, long arg1, long arg2, long arg3,
  46                                  long arg4, long arg5, long arg6)
  47 {
  48         __asm__("movq %0, %%r9; " : : "g" (arg6) : "%r9");
  49         __asm__("movq %0, %%r8; " : : "g" (arg5) : "%r8");
  50         return(stub_syscall4(syscall, arg1, arg2, arg3, arg4));
  51 }
  52
  53 static inline void trap_myself(void)
  54 {
  55         __asm("int3");
  56 }
  57
  58 #endif