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      1 /*	$NetBSD: __longjmp14.c,v 1.6 2024/06/29 06:52:34 rin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christian Limpach and Matt Thomas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "namespace.h"
     33 #include <sys/types.h>
     34 #include <ucontext.h>
     35 #include <signal.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 #include <machine/reg.h>
     39 
     40 #define __LIBC12_SOURCE__
     41 #include <setjmp.h>
     42 #include <compat/include/setjmp.h>
     43 
     44 struct _jmp_buf {
     45 	struct sigcontext jb_sc;
     46 	__register_t jb_regs[6];
     47 };
     48 
     49 void
     50 __longjmp14(jmp_buf env, int val)
     51 {
     52 	struct _jmp_buf *jb = (void *)env;
     53 	ucontext_t uc;
     54 
     55 	/* Ensure non-zero SP */
     56 	if (jb->jb_sc.sc_sp == 0)
     57 		goto err;
     58 
     59 	/* Return 1 if val is zero */
     60 	if (val == 0)
     61 		val = 1;
     62 
     63 	/* Set _UC_SIGMASK and _UC_CPU */
     64 	uc.uc_flags = _UC_SIGMASK | _UC_CPU;
     65 
     66 	/* Clear uc_link */
     67 	uc.uc_link = 0;
     68 
     69 	/* Save return value in context */
     70 	uc.uc_mcontext.__gregs[_REG_R0] = val;
     71 
     72 	/* Copy saved registers */
     73 	uc.uc_mcontext.__gregs[_REG_AP] = jb->jb_sc.sc_ap;
     74 	uc.uc_mcontext.__gregs[_REG_SP] = jb->jb_sc.sc_sp;
     75 	uc.uc_mcontext.__gregs[_REG_FP] = jb->jb_sc.sc_fp;
     76 	uc.uc_mcontext.__gregs[_REG_PC] = jb->jb_sc.sc_pc;
     77 	uc.uc_mcontext.__gregs[_REG_PSL] = jb->jb_sc.sc_ps;
     78 
     79 	uc.uc_mcontext.__gregs[_REG_R6] = jb->jb_regs[0];
     80 	uc.uc_mcontext.__gregs[_REG_R7] = jb->jb_regs[1];
     81 	uc.uc_mcontext.__gregs[_REG_R8] = jb->jb_regs[2];
     82 	uc.uc_mcontext.__gregs[_REG_R9] = jb->jb_regs[3];
     83 	uc.uc_mcontext.__gregs[_REG_R10] = jb->jb_regs[4];
     84 	uc.uc_mcontext.__gregs[_REG_R11] = jb->jb_regs[5];
     85 
     86 	/* Copy signal mask */
     87 	uc.uc_sigmask = jb->jb_sc.sc_mask;
     88 
     89 	setcontext(&uc);
     90  err:
     91 	longjmperror();
     92 	abort();
     93 	/* NOTREACHED */
     94 }
     95