1  /* Copyright (C) 1997-2023 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  /* Define the machine-dependent type `jmp_buf'.  PowerPC version.  */
      19  #ifndef _BITS_SETJMP_H
      20  #define _BITS_SETJMP_H  1
      21  
      22  #if !defined _SETJMP_H && !defined _PTHREAD_H
      23  # error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
      24  #endif
      25  
      26  /* The previous bits/setjmp.h had __jmp_buf defined as a structure.
      27     We use an array of 'long int' instead, to make writing the
      28     assembler easier. Naturally, user code should not depend on
      29     either representation. */
      30  
      31  #include <bits/wordsize.h>
      32  
      33  /* The current powerpc 32-bit Altivec ABI specifies for SVR4 ABI and EABI
      34     the vrsave must be at byte 248 & v20 at byte 256.  So we must pad this
      35     correctly on 32 bit.  It also insists that vecregs are only guaranteed
      36     4 byte alignment so we need to use vperm in the setjmp/longjmp routines.
      37     We have to version the code because members like  int __mask_was_saved
      38     in the jmp_buf will move as jmp_buf is now larger than 248 bytes.  We
      39     cannot keep the altivec jmp_buf backward compatible with the jmp_buf.  */
      40  #ifndef	_ASM
      41  # if __WORDSIZE == 64
      42  typedef long int __jmp_buf[64] __attribute__ ((__aligned__ (16)));
      43  # else
      44  /* The alignment is not essential, i.e.the buffer can be copied to a 4 byte
      45     aligned buffer as per the ABI it is just added for performance reasons.  */
      46  typedef long int __jmp_buf[64 + (12 * 4)] __attribute__ ((__aligned__ (16)));
      47  # endif
      48  #endif
      49  
      50  #endif  /* bits/setjmp.h */