1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 /*
  28  * Copyright 2023 Oxide Computer Company
  29  */
  30 
  31 #include "lint.h"
  32 #include <sys/types.h>
  33 #include <sys/ucontext.h>
  34 #include <setjmp.h>
  35 #include <ucontext.h>
  36 #include <strings.h>
  37 #include <upanic.h>
  38 #include "sigjmp_struct.h"
  39 #include "libc.h"
  40 
  41 #pragma weak _siglongjmp = siglongjmp
  42 
  43 void
  44 siglongjmp(sigjmp_buf env, int val)
  45 {
  46         const char *msg = "siglongjmp(): setcontext() returned";
  47         ucontext_t *ucp = SIGJMP2UCONTEXT(env);
  48 
  49         if (val)
  50                 ucp->uc_mcontext.gregs[REG_R0] = val;
  51         else
  52                 ucp->uc_mcontext.gregs[REG_R0] = 1;
  53 
  54         /*
  55          * While unlikely, it is possible that setcontext() may fail for some
  56          * reason. If that happens, we will kill the process.
  57          */
  58         (void) setcontext(ucp);
  59         upanic(msg, strlen(msg) + 1);
  60 }