arch/um/include/sysdep-i386/frame_kern.h

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __FRAME_KERN_I386_H
   7 #define __FRAME_KERN_I386_H
   8
   9 /* This is called from sys_sigreturn.  It takes the sp at the point of the
  10  * sigreturn system call and returns the address of the sigcontext struct
  11  * on the stack.
  12  */
  13
  14 static inline void *sp_to_sc(unsigned long sp)
  15 {
  16         return((void *) sp);
  17 }
  18
  19 static inline void *sp_to_uc(unsigned long sp)
  20 {
  21         unsigned long uc;
  22
  23         uc = sp + signal_frame_si.uc_index -
  24                 signal_frame_si.common.sp_index - 4;
  25         return((void *) uc);
  26 }
  27
  28 static inline void *sp_to_rt_sc(unsigned long sp)
  29 {
  30         unsigned long sc;
  31
  32         sc = sp - signal_frame_si.common.sp_index +
  33                 signal_frame_si.common.len - 4;
  34         return((void *) sc);
  35 }
  36
  37 static inline void *sp_to_mask(unsigned long sp)
  38 {
  39         unsigned long mask;
  40
  41         mask = sp - signal_frame_sc.common.sp_index +
  42                 signal_frame_sc.common.len - 8;
  43         return((void *) mask);
  44 }
  45
  46 extern int sc_size(void *data);
  47
  48 static inline void *sp_to_rt_mask(unsigned long sp)
  49 {
  50         unsigned long mask;
  51
  52         mask = sp - signal_frame_si.common.sp_index +
  53                 signal_frame_si.common.len +
  54                 sc_size(&signal_frame_si.common.arch) - 4;
  55         return((void *) mask);
  56 }
  57
  58 #endif
  59
  60 /*
  61  * Overrides for Emacs so that we follow Linus's tabbing style.
  62  * Emacs will notice this stuff at the end of the file and automatically
  63  * adjust the settings for this buffer only.  This must remain at the end
  64  * of the file.
  65  * ---------------------------------------------------------------------------
  66  * Local variables:
  67  * c-file-style: "linux"
  68  * End:
  69  */