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C/C++ Source or Header  |  1994-04-19  |  2KB  |  62 lines
  1. /* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3.  
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Library General Public License as
  6. published by the Free Software Foundation; either version 2 of the
  7. License, or (at your option) any later version.
  8.  
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12. Library General Public License for more details.
  13.  
  14. You should have received a copy of the GNU Library General Public
  15. License along with the GNU C Library; see the file COPYING.LIB.  If
  16. not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17. Cambridge, MA 02139, USA.  */
  18.  
  19. #define    ENTRY(name)                                  \
  20.   .text;                                      \
  21.   .globl _##name;                                  \
  22.   .align 4;                                      \
  23.   _##name##:
  24.  
  25. #define    SYSCALL_TRAP(name, number)                          \
  26.   ENTRY (name)                                      \
  27.   lea number, %eax;                                  \
  28.   /* lcall $7, $0; */                                  \
  29.   /* Above loses; GAS bug.  */                              \
  30.   .byte 0x9a, 0, 0, 0, 0, 7, 0;                              \
  31.   ret
  32.  
  33. #define MOVE(x,y)    movl x , y
  34.  
  35. #define LOSE asm volatile ("hlt")
  36.  
  37. #define SNARF_ARGS(argc, argv, envp)                          \
  38.   do                                          \
  39.     {                                          \
  40.       int *entry_sp;                                  \
  41.       register char **p;                              \
  42.                                           \
  43.       asm ("leal 4(%%ebp), %0" : "=r" (entry_sp));                  \
  44.                                           \
  45.       argc = *entry_sp;                                  \
  46.       argv = (char **) (entry_sp + 1);                          \
  47.       p = argv;                                      \
  48.       while (*p++ != NULL)                              \
  49.     ;                                      \
  50.       if (p >= (char **) argv[0])                          \
  51.     --p;                                      \
  52.       envp = p;                                  \
  53.     } while (0)
  54.  
  55. #define CALL_WITH_SP(fn, sp) \
  56.   asm volatile ("movl %0, %%esp; jmp %1" : : \
  57.         "g" (sp), "m" (*(long int *) (fn)) : "%esp")
  58.  
  59. #define STACK_GROWTH_DOWN
  60.  
  61. #include_next <sysdep.h>
  62.