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

   1 /* Copyright (C) 1997-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Richard Henderson (rth@tamu.edu).
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 /* __sigsetjmp is implemented in terms of the getcontext trap on
  20    Linux/Sparc64.  */
  21
  22 #include <sysdep.h>
  23
  24 /* Offsets into the jmp_buf structure.  */
  25
  26 #define O_mask_was_saved        512
  27 #define O_gregs                 32
  28 #define O_g1                    (O_gregs + 4*8)
  29
  30 /* int _setjmp(jmp_buf) */
  31
  32 ENTRY(_setjmp)
  33         ba      __sigsetjmp_local
  34          set    0, %o1
  35 END(_setjmp)
  36 libc_hidden_def (_setjmp)
  37
  38 /* int setjmp(jmp_buf) */
  39
  40 ENTRY(setjmp)
  41         ba,pt   %xcc, __sigsetjmp_local
  42          set    1, %o1
  43 END(setjmp)
  44
  45 /* int __sigsetjmp(jmp_buf, savemask)  */
  46
  47 ENTRY(__sigsetjmp)
  48 __sigsetjmp_local:
  49
  50         /* Record whether the user is intending to save the sigmask.  */
  51         st      %o1, [%o0 + O_mask_was_saved]
  52
  53         /* Load up our return value, as longjmp is going to override
  54            the jmp_buf on its way back.  */
  55         mov     %g0, %g1
  56
  57         /* And call getcontext!  */
  58         ta      0x6e
  59
  60         retl
  61          mov    %g1, %o0
  62
  63 END(__sigsetjmp)
  64
  65 weak_extern(_setjmp)
  66 weak_extern(setjmp)