sysdeps/s390/s390-64/__longjmp.c

   1 /* Copyright (C) 2001-2024 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 #include <errno.h>
  19 #include <sysdep.h>
  20 #include <pointer_guard.h>
  21 #include <setjmp.h>
  22 #include <bits/setjmp.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <stap-probe.h>
  26
  27 /* See sysdeps/unix/sysv/linux/s390/s390-64/pointer_guard.h.  */
  28 #if IS_IN (rtld)
  29 # undef PTR_DEMANGLE
  30 #endif
  31
  32 /* Jump to the position specified by ENV, causing the
  33    setjmp call there to return VAL, or 1 if VAL is 0.  */
  34 void
  35 __longjmp (__jmp_buf env, int val)
  36 {
  37 #ifdef PTR_DEMANGLE
  38   uintptr_t guard = THREAD_GET_POINTER_GUARD ();
  39 # ifdef CHECK_SP
  40   CHECK_SP (env, guard);
  41 # endif
  42 #elif defined CHECK_SP
  43   CHECK_SP (env, 0);
  44 #endif
  45   register long int r2 __asm__ ("%r2") = val == 0 ? 1 : val;
  46 #ifdef PTR_DEMANGLE
  47   register uintptr_t r3 __asm__ ("%r3") = guard;
  48   register void *r1 __asm__ ("%r1") = (void *) env;
  49 #endif
  50   /* Restore registers and jump back.  */
  51   __asm__ __volatile__ (
  52                         /* longjmp probe expects longjmp first argument, second
  53                            argument and target address.  */
  54 #ifdef PTR_DEMANGLE
  55                         "lmg  %%r4,%%r5,64(%1)\n\t"
  56                         "xgr  %%r4,%2\n\t"
  57                         "xgr  %%r5,%2\n\t"
  58                         LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r4)
  59 #else
  60                         LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r14)
  61 #endif
  62
  63                         /* restore fpregs  */
  64                         "ld    %%f8,80(%1)\n\t"
  65                         "ld    %%f9,88(%1)\n\t"
  66                         "ld    %%f10,96(%1)\n\t"
  67                         "ld    %%f11,104(%1)\n\t"
  68                         "ld    %%f12,112(%1)\n\t"
  69                         "ld    %%f13,120(%1)\n\t"
  70                         "ld    %%f14,128(%1)\n\t"
  71                         "ld    %%f15,136(%1)\n\t"
  72
  73                         /* restore gregs and return to jmp_buf target  */
  74 #ifdef PTR_DEMANGLE
  75                         "lmg  %%r6,%%r13,0(%1)\n\t"
  76                         "lgr  %%r15,%%r5\n\t"
  77                         LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%r4)
  78                         "br   %%r4"
  79 #else
  80                         "lmg  %%r6,%%r15,0(%1)\n\t"
  81                         LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%r14)
  82                         "br   %%r14"
  83 #endif
  84                         : : "r" (r2),
  85 #ifdef PTR_DEMANGLE
  86                           "r" (r1), "r" (r3)
  87 #else
  88                           "a" (env)
  89 #endif
  90                         );
  91
  92   /* Avoid `volatile function does return' warnings.  */
  93   for (;;);
  94 }