sysdeps/unix/sysv/linux/sparc/sparc64/setjmp.S

   1 /* Copyright (C) 1997-2021 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 /* __sigsetjmp is implemented in terms of the getcontext trap on
  19    Linux/Sparc64.  */
  20
  21 #include <sysdep.h>
  22
  23 /* Offsets into the jmp_buf structure.  */
  24
  25 #define O_mask_was_saved        512
  26 #define O_gregs                 32
  27 #define O_g1                    (O_gregs + 4*8)
  28
  29 /* int _setjmp(jmp_buf) */
  30
  31 ENTRY(_setjmp)
  32         ba      __sigsetjmp_local
  33          set    0, %o1
  34 END(_setjmp)
  35 libc_hidden_def (_setjmp)
  36
  37 /* int setjmp(jmp_buf) */
  38
  39 ENTRY(setjmp)
  40         ba,pt   %xcc, __sigsetjmp_local
  41          set    1, %o1
  42 END(setjmp)
  43
  44 /* int __sigsetjmp(jmp_buf, savemask)  */
  45
  46 ENTRY(__sigsetjmp)
  47 __sigsetjmp_local:
  48
  49         /* Record whether the user is intending to save the sigmask.  */
  50         st      %o1, [%o0 + O_mask_was_saved]
  51
  52         /* Load up our return value, as longjmp is going to override
  53            the jmp_buf on its way back.  */
  54         mov     %g0, %g1
  55
  56         /* And call getcontext!  */
  57         ta      0x6e
  58
  59         retl
  60          mov    %g1, %o0
  61
  62 END(__sigsetjmp)
  63 hidden_def (__sigsetjmp)
  64
  65 weak_extern(_setjmp)
  66 weak_extern(setjmp)