arch/x86/um/shared/sysdep/stub_64.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 <sysdep/ptrace_user.h>
  10
  11 #define STUB_SYSCALL_RET PT_INDEX(RAX)
  12 #define STUB_MMAP_NR __NR_mmap
  13 #define MMAP_OFFSET(o) (o)
  14
  15 #define __syscall_clobber "r11","rcx","memory"
  16 #define __syscall "syscall"
  17
  18 static inline long stub_syscall0(long syscall)
  19 {
  20         long ret;
  21
  22         __asm__ volatile (__syscall
  23                 : "=a" (ret)
  24                 : "0" (syscall) : __syscall_clobber );
  25
  26         return ret;
  27 }
  28
  29 static inline long stub_syscall2(long syscall, long arg1, long arg2)
  30 {
  31         long ret;
  32
  33         __asm__ volatile (__syscall
  34                 : "=a" (ret)
  35                 : "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
  36
  37         return ret;
  38 }
  39
  40 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  41 {
  42         long ret;
  43
  44         __asm__ volatile (__syscall
  45                 : "=a" (ret)
  46                 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
  47                 : __syscall_clobber );
  48
  49         return ret;
  50 }
  51
  52 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  53                                  long arg4)
  54 {
  55         long ret;
  56
  57         __asm__ volatile ("movq %5,%%r10 ; " __syscall
  58                 : "=a" (ret)
  59                 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
  60                   "g" (arg4)
  61                 : __syscall_clobber, "r10" );
  62
  63         return ret;
  64 }
  65
  66 static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
  67                                  long arg4, long arg5)
  68 {
  69         long ret;
  70
  71         __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
  72                 : "=a" (ret)
  73                 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
  74                   "g" (arg4), "g" (arg5)
  75                 : __syscall_clobber, "r10", "r8" );
  76
  77         return ret;
  78 }
  79
  80 static inline void trap_myself(void)
  81 {
  82         __asm("int3");
  83 }
  84
  85 static inline void remap_stack(long fd, unsigned long offset)
  86 {
  87         __asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
  88                           "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
  89                           "movq %%rax, (%%rbx)":
  90                           : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
  91                             "S" (UM_KERN_PAGE_SIZE),
  92                             "d" (PROT_READ | PROT_WRITE),
  93                             "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
  94                             "g" (offset),
  95                             "i" (&((struct stub_data *) STUB_DATA)->err)
  96                           : __syscall_clobber, "r10", "r8", "r9" );
  97 }
  98
  99 #endif