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 <sys/mman.h>
  10 #include <asm/ptrace.h>
  11 #include <asm/unistd.h>
  12 #include "stub-data.h"
  13 #include "kern_constants.h"
  14 #include "uml-config.h"
  15
  16 extern void stub_segv_handler(int sig);
  17 extern void stub_clone_handler(void);
  18
  19 #define STUB_SYSCALL_RET EAX
  20 #define STUB_MMAP_NR __NR_mmap2
  21 #define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT)
  22
  23 static inline long stub_syscall0(long syscall)
  24 {
  25         long ret;
  26
  27         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
  28
  29         return ret;
  30 }
  31
  32 static inline long stub_syscall1(long syscall, long arg1)
  33 {
  34         long ret;
  35
  36         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
  37
  38         return ret;
  39 }
  40
  41 static inline long stub_syscall2(long syscall, long arg1, long arg2)
  42 {
  43         long ret;
  44
  45         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  46                         "c" (arg2));
  47
  48         return ret;
  49 }
  50
  51 static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
  52 {
  53         long ret;
  54
  55         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  56                         "c" (arg2), "d" (arg3));
  57
  58         return ret;
  59 }
  60
  61 static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
  62                                  long arg4)
  63 {
  64         long ret;
  65
  66         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  67                         "c" (arg2), "d" (arg3), "S" (arg4));
  68
  69         return ret;
  70 }
  71
  72 static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
  73                                  long arg4, long arg5)
  74 {
  75         long ret;
  76
  77         __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
  78                         "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
  79
  80         return ret;
  81 }
  82
  83 static inline void trap_myself(void)
  84 {
  85         __asm("int3");
  86 }
  87
  88 static inline void remap_stack(int fd, unsigned long offset)
  89 {
  90         __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
  91                           "movl %7, %%ebx ; movl %%eax, (%%ebx)"
  92                           : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA),
  93                             "c" (UM_KERN_PAGE_SIZE),
  94                             "d" (PROT_READ | PROT_WRITE),
  95                             "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
  96                             "a" (offset),
  97                             "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err)
  98                           : "memory");
  99 }
 100
 101 #endif