sysdeps/mach/sysdep.h

   1 /* Copyright (C) 1994-2023 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    <https://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 #undef ENTRY2
  34 #define ENTRY(name) \
  35   .globl 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 /* LOSE can be defined as the `halt' instruction or something
  67    similar which will cause the process to die in a characteristic
  68    way suggesting a bug.  */
  69 #ifndef LOSE
  70 #define LOSE    ({ volatile int zero = 0; zero / zero; })
  71 #endif
  72
  73 /* One of these should be defined to specify the stack direction.  */
  74 #if !defined (STACK_GROWTH_UP) && !defined (STACK_GROWTH_DOWN)
  75 #error stack direction unspecified
  76 #endif
  77
  78 /* Used by some assembly code.  */
  79 #define C_SYMBOL_NAME(name)     name