1  /* Shared object part of test for setjmp interoperability with static
       2     dlopen BZ #21895.
       3     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <string.h>
      21  #include <setjmp.h>
      22  
      23  /* Copy r1 address to a local variable.  */
      24  #define GET_STACK_POINTER(sp)	  \
      25    ({				  \
      26      asm volatile ("mr %0, 1\n\t"  \
      27  		  : "=r" (sp));	  \
      28    })
      29  
      30  jmp_buf jb;
      31  void (*bar)(jmp_buf, unsigned long);
      32  
      33  void
      34  lbar (unsigned long sp)
      35  {
      36    bar(jb, sp);
      37    for(;;);
      38  }
      39  
      40  void
      41  foo (void)
      42  {
      43    unsigned long sp;
      44    /* Copy r1 (stack pointer) to sp. It will be use later to get
      45       TOC area.  */
      46    GET_STACK_POINTER(sp);
      47    setjmp(jb);
      48    lbar(sp);
      49  
      50    for(;;);
      51  }