sysdeps/mach/sysdep.h

   1 /* Copyright (C) 1994, 1995, 1997 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifdef __ASSEMBLER__
  20
  21 /* Get the Mach definitions of ENTRY and kernel_trap.  */
  22 #include <mach/machine/syscall_sw.h>
  23
  24 /* The Mach definitions assume underscores should be prepended to
  25    symbol names.  Redefine them to do so only when appropriate.  */
  26 #undef EXT
  27 #undef LEXT
  28 #define EXT(x) C_SYMBOL_NAME(x)
  29 #define LEXT(x) C_SYMBOL_NAME(x##:)
  30
  31 #ifdef HAVE_ELF
  32 /* For ELF we need to add the `.type' directive to make shared libraries
  33    work right.  */
  34 #undef ENTRY
  35 #define ENTRY(name) \
  36   ASM_GLOBAL_DIRECTIVE name; \
  37   .align ALIGN; \
  38   .type name,@function; \
  39   name:
  40 #endif
  41
  42 #endif
  43
  44 /* This is invoked by things run when there is random lossage, before they
  45    try to do anything else.  Just to be safe, deallocate the reply port so
  46    bogons arriving on it don't foul up future RPCs.  */
  47
  48 #ifndef __ASSEMBLER__
  49 #define FATAL_PREPARE_INCLUDE <mach/mig_support.h>
  50 #define FATAL_PREPARE __mig_dealloc_reply_port (MACH_PORT_NULL)
  51 #endif
  52
  53 /* sysdeps/mach/MACHINE/sysdep.h should define the following macros.  */
  54
  55 /* Produce a text assembler label for the C global symbol NAME.  */
  56 #ifndef ENTRY
  57 #define ENTRY(name) .error ENTRY not defined by sysdeps/mach/MACHINE/sysdep.h
  58 /* This is not used on all machines.  */
  59 #endif
  60
  61 /* Set variables ARGC, ARGV, and ENVP for the arguments
  62    left on the stack by the microkernel.  */
  63 #ifndef SNARF_ARGS
  64 #define SNARF_ARGS(argc, argv, envp)
  65 #error SNARF_ARGS not defined by sysdeps/mach/MACHINE/sysdep.h
  66 #endif
  67
  68 /* Call the C function FN with no arguments,
  69    on a stack starting at SP (as returned by *_cthread_init_routine).
  70    You don't need to deal with FN returning; it shouldn't.  */
  71 #ifndef CALL_WITH_SP
  72 #define CALL_WITH_SP(fn, sp)
  73 #error CALL_WITH_SP not defined by sysdeps/mach/MACHINE/sysdep.h
  74 #endif
  75
  76 /* LOSE can be defined as the `halt' instruction or something
  77    similar which will cause the process to die in a characteristic
  78    way suggesting a bug.  */
  79 #ifndef LOSE
  80 #define LOSE    ({ volatile int zero = 0; zero / zero; })
  81 #endif
  82
  83 /* One of these should be defined to specify the stack direction.  */
  84 #if !defined (STACK_GROWTH_UP) && !defined (STACK_GROWTH_DOWN)
  85 #error stack direction unspecified
  86 #endif
  87
  88 /* Used by some assembly code.  */
  89 #ifdef NO_UNDERSCORES
  90 #define C_SYMBOL_NAME(name)     name
  91 #else
  92 #define C_SYMBOL_NAME(name)     _##name
  93 #endif