sysdeps/powerpc/bits/setjmp.h

   1 /* Copyright (C) 1997-2019 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 gauranteed
  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 */