sysdeps/mach/sysdep.h

   1 /* Copyright (C) 1994, 1995, 1997, 2012 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 /* For ELF we need to add the `.type' directive to make shared libraries
  32    work right.  */
  33 #undef ENTRY
  34 #define ENTRY(name) \
  35   ASM_GLOBAL_DIRECTIVE name; \
  36   .align ALIGN; \
  37   .type name,@function; \
  38   name:
  39
  40 #endif
  41
  42 /* This is invoked by things run when there is random lossage, before they
  43    try to do anything else.  Just to be safe, deallocate the reply port so
  44    bogons arriving on it don't foul up future RPCs.  */
  45
  46 #ifndef __ASSEMBLER__
  47 #define FATAL_PREPARE_INCLUDE <mach/mig_support.h>
  48 #define FATAL_PREPARE __mig_dealloc_reply_port (MACH_PORT_NULL)
  49 #endif
  50
  51 /* sysdeps/mach/MACHINE/sysdep.h should define the following macros.  */
  52
  53 /* Produce a text assembler label for the C global symbol NAME.  */
  54 #ifndef ENTRY
  55 #define ENTRY(name) .error ENTRY not defined by sysdeps/mach/MACHINE/sysdep.h
  56 /* This is not used on all machines.  */
  57 #endif
  58
  59 /* Set variables ARGC, ARGV, and ENVP for the arguments
  60    left on the stack by the microkernel.  */
  61 #ifndef SNARF_ARGS
  62 #define SNARF_ARGS(argc, argv, envp)
  63 #error SNARF_ARGS not defined by sysdeps/mach/MACHINE/sysdep.h
  64 #endif
  65
  66 /* Call the C function FN with no arguments,
  67    on a stack starting at SP (as returned by *_cthread_init_routine).
  68    You don't need to deal with FN returning; it shouldn't.  */
  69 #ifndef CALL_WITH_SP
  70 #define CALL_WITH_SP(fn, sp)
  71 #error CALL_WITH_SP not defined by sysdeps/mach/MACHINE/sysdep.h
  72 #endif
  73
  74 /* LOSE can be defined as the `halt' instruction or something
  75    similar which will cause the process to die in a characteristic
  76    way suggesting a bug.  */
  77 #ifndef LOSE
  78 #define LOSE    ({ volatile int zero = 0; zero / zero; })
  79 #endif
  80
  81 /* One of these should be defined to specify the stack direction.  */
  82 #if !defined (STACK_GROWTH_UP) && !defined (STACK_GROWTH_DOWN)
  83 #error stack direction unspecified
  84 #endif
  85
  86 /* Used by some assembly code.  */
  87 #define C_SYMBOL_NAME(name)     name