sysdeps/mach/sysdep.h

   1 /* Copyright (C) 1994-2015 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef __ASSEMBLER__
  19
  20 /* Get the Mach definitions of ENTRY and kernel_trap.  */
  21 #include <mach/machine/syscall_sw.h>
  22
  23 /* The Mach definitions assume underscores should be prepended to
  24    symbol names.  Redefine them to do so only when appropriate.  */
  25 #undef EXT
  26 #undef LEXT
  27 #define EXT(x) C_SYMBOL_NAME(x)
  28 #define LEXT(x) C_SYMBOL_NAME(x##:)
  29
  30 /* For ELF we need to add the `.type' directive to make shared libraries
  31    work right.  */
  32 #undef ENTRY
  33 #define ENTRY(name) \
  34   .globl name; \
  35   .align ALIGN; \
  36   .type name,@function; \
  37   name:
  38
  39 #endif
  40
  41 /* This is invoked by things run when there is random lossage, before they
  42    try to do anything else.  Just to be safe, deallocate the reply port so
  43    bogons arriving on it don't foul up future RPCs.  */
  44
  45 #ifndef __ASSEMBLER__
  46 #define FATAL_PREPARE_INCLUDE <mach/mig_support.h>
  47 #define FATAL_PREPARE __mig_dealloc_reply_port (MACH_PORT_NULL)
  48 #endif
  49
  50 /* sysdeps/mach/MACHINE/sysdep.h should define the following macros.  */
  51
  52 /* Produce a text assembler label for the C global symbol NAME.  */
  53 #ifndef ENTRY
  54 #define ENTRY(name) .error ENTRY not defined by sysdeps/mach/MACHINE/sysdep.h
  55 /* This is not used on all machines.  */
  56 #endif
  57
  58 /* Set variables ARGC, ARGV, and ENVP for the arguments
  59    left on the stack by the microkernel.  */
  60 #ifndef SNARF_ARGS
  61 #define SNARF_ARGS(argc, argv, envp)
  62 #error SNARF_ARGS not defined by sysdeps/mach/MACHINE/sysdep.h
  63 #endif
  64
  65 /* Call the C function FN with no arguments,
  66    on a stack starting at SP (as returned by *_cthread_init_routine).
  67    You don't need to deal with FN returning; it shouldn't.  */
  68 #ifndef CALL_WITH_SP
  69 #define CALL_WITH_SP(fn, sp)
  70 #error CALL_WITH_SP not defined by sysdeps/mach/MACHINE/sysdep.h
  71 #endif
  72
  73 /* LOSE can be defined as the `halt' instruction or something
  74    similar which will cause the process to die in a characteristic
  75    way suggesting a bug.  */
  76 #ifndef LOSE
  77 #define LOSE    ({ volatile int zero = 0; zero / zero; })
  78 #endif
  79
  80 /* One of these should be defined to specify the stack direction.  */
  81 #if !defined (STACK_GROWTH_UP) && !defined (STACK_GROWTH_DOWN)
  82 #error stack direction unspecified
  83 #endif
  84
  85 /* Used by some assembly code.  */
  86 #define C_SYMBOL_NAME(name)     name