ports/sysdeps/hppa/__longjmp.c

   1 /* longjmp for PA-RISC.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <setjmp.h>
  20 #include <stdlib.h>
  21
  22 /* Jump to the position specified by ENV, causing the
  23    setjmp call there to return VAL, or 1 if VAL is 0.  */
  24 void
  25 __longjmp (__jmp_buf env, int val)
  26 {
  27   /* We must use one of the non-callee saves registers
  28      for env.  */
  29   register unsigned long r26 asm ("r26") = (unsigned long)&env[0];
  30   register unsigned long r25 asm ("r25") = (unsigned long)(val == 0 ? 1 : val);
  31
  32 #ifdef CHECK_SP
  33   CHECK_SP (env[0].__jmp_buf.__sp);
  34 #endif
  35
  36   asm volatile(
  37         /* Set return value.  */
  38         "copy   %0, %%r28\n\t"
  39         /* Load callee saves from r3 to r18.  */
  40         "ldw    0(%1), %%r3\n\t"
  41         "ldw    8(%1), %%r4\n\t"
  42         "ldw    12(%1), %%r5\n\t"
  43         "ldw    16(%1), %%r6\n\t"
  44         "ldw    20(%1), %%r7\n\t"
  45         "ldw    24(%1), %%r8\n\t"
  46         "ldw    28(%1), %%r9\n\t"
  47         "ldw    32(%1), %%r10\n\t"
  48         "ldw    36(%1), %%r11\n\t"
  49         "ldw    40(%1), %%r12\n\t"
  50         "ldw    44(%1), %%r13\n\t"
  51         "ldw    48(%1), %%r14\n\t"
  52         "ldw    52(%1), %%r15\n\t"
  53         "ldw    56(%1), %%r16\n\t"
  54         "ldw    60(%1), %%r17\n\t"
  55         "ldw    64(%1), %%r18\n\t"
  56         /* Load PIC register.  */
  57         "ldw    68(%1), %%r19\n\t"
  58         /* Load static link register.  */
  59         "ldw    72(%1), %%r27\n\t"
  60         /* Load stack pointer.  */
  61         "ldw    76(%1), %%r30\n\t"
  62         /* Load return pointer. */
  63         "ldw    80(%1), %%rp\n\t"
  64         /* Ues a spare caller saves register.  */
  65         "ldo    88(%1),%%r25\n\t"
  66         /* Load callee saves from fr12 to fr21.  */
  67         "fldds,ma 8(%%r25), %%fr12\n\t"
  68         "fldds,ma 8(%%r25), %%fr13\n\t"
  69         "fldds,ma 8(%%r25), %%fr14\n\t"
  70         "fldds,ma 8(%%r25), %%fr15\n\t"
  71         "fldds,ma 8(%%r25), %%fr16\n\t"
  72         "fldds,ma 8(%%r25), %%fr17\n\t"
  73         "fldds,ma 8(%%r25), %%fr18\n\t"
  74         "fldds,ma 8(%%r25), %%fr19\n\t"
  75         "fldds,ma 8(%%r25), %%fr20\n\t"
  76         "fldds   0(%%r25), %%fr21\n\t"
  77         /* Jump back to stored return address.  */
  78         "bv,n   %%r0(%%r2)\n\t"
  79         : /* No outputs.  */
  80         : "r" (r25), "r" (r26)
  81         : /* No point in clobbers.  */ );
  82   /* Avoid `volatile function does return' warnings.  */
  83   for (;;);
  84 }