1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2  
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #ifndef _MACH_X86_SYSDEP_H
      20  #define _MACH_X86_SYSDEP_H 1
      21  
      22  /* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO.  */
      23  #include <dl-sysdep.h>
      24  #include <tls.h>
      25  
      26  #define LOSE asm volatile ("hlt")
      27  
      28  #define SNARF_ARGS(entry_sp, argc, argv, envp)				      \
      29    do									      \
      30      {									      \
      31        char **p;								      \
      32        argc = (int) *entry_sp;						      \
      33        argv = (char **) (entry_sp + 1);					      \
      34        p = argv;								      \
      35        while (*p++ != NULL)						      \
      36  	;								      \
      37        if (p >= (char **) argv[0])					      \
      38  	--p;								      \
      39        envp = p;							      \
      40      } while (0)
      41  
      42  #define STACK_GROWTH_DOWN
      43  
      44  /* Get the machine-independent Mach definitions.  */
      45  #include <sysdeps/mach/sysdep.h>
      46  
      47  #undef ENTRY
      48  #undef ALIGN
      49  
      50  #ifdef __x86_64__
      51  #define RETURN_TO(sp, pc, retval) \
      52    asm volatile ("movq %0, %%rsp; jmp %*%1 # %2" \
      53  		: : "g" (sp), "r" (pc), "a" (retval))
      54  /* This should be rearranged, but at the moment this file provides
      55     the most useful definitions for assembler syntax details.  */
      56  #include <sysdeps/unix/x86_64/sysdep.h>
      57  #else
      58  #define RETURN_TO(sp, pc, retval) \
      59    asm volatile ("movl %0, %%esp; jmp %*%1 # %2" \
      60  		: : "g" (sp), "r" (pc), "a" (retval))
      61  #include <sysdeps/unix/i386/sysdep.h>
      62  #endif
      63  
      64  #endif /* mach/x86/sysdep.h */