arch/.unmaintained/m68k-pp-native/loader/callback.h

   1 #ifndef __CALLBACK_H__
   2 #define __CALLBACK_H__
   3
   4 /* This is a workaround for a bug in the current version of gcc:
   5
   6    gcc assumes that no one will touch %a4 after it is set up in crt0.o.
   7    This isn't true if a function is called as a callback by something
   8    that wasn't compiled by gcc (like FrmCloseAllForms()).  It may also
   9    not be true if it is used as a callback by something in a different
  10    shared library.
  11
  12    We really want a function attribute "callback" which will insert this
  13    progloue and epilogoue automatically.
  14
  15       - Ian */
  16
  17 register void *reg_a4 asm("%a4");
  18
  19 #define CALLBACK_PROLOGUE \
  20     void *save_a4 = reg_a4; asm("move.l %%a5,%%a4; sub.l #edata,%%a4" : :);
  21
  22 #define CALLBACK_EPILOGUE reg_a4 = save_a4;
  23
  24 #endif