/* $OpenBSD: setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $ */ /* $NetBSD: setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp */ #if defined(LIBC_SCCS) && !defined(lint) #ifdef notdef .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" #endif .asciz "$NetBSD: setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh Exp $" #endif /* LIBC_SCCS and not lint */ /* * C library -- setjmp, longjmp * * longjmp(a,v) * will generate a "return(v)" from * the last call to * setjmp(a) * by restoring registers from the stack, * and a struct sigcontext, see */ #include "SYS.h" ENTRY(setjmp) /* * We use the caller's `arg dump' area (%sp+0x44; there are 6 ints * reserved there for us) to avoid having to allocate stack space * here. */ mov %o0, %o2 /* build sigcontext in [%o2] */ mov 1, %o0 /* SIG_BLOCK */ mov SYS_sigprocmask, %g1 clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */ t ST_SYSCALL st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */ mov SYS_sigaltstack, %g1 clr %o0 /* sigstack(NULL, &foo) */ add %sp, 0x48, %o1 /* (foo being in arg dump area) */ t ST_SYSCALL ld [%sp + 0x50], %o0 /* foo.ss_flags */ and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */ st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */ add %o7, 8, %o0 st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */ add %o7, 12, %o0 st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */ st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */ st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */ /* sc.sc_o0 = random(), set in longjmp */ retl /* return 0 */ clr %o0 /* * All we need to do here is force sigreturn to load a new stack pointer, * new , and appropriate %o0 return value from the sigcontext built * in setjmp. The %i and %l registers will be reloaded from the place to * which %sp points, due to sigreturn() semantics (sigreturn does not modify * the window pointer in the psr, hence it must force all windows to reload). */ ENTRY(longjmp) save %sp, -96, %sp ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ ld [%i0 + 24], %o3 orcc %o2, %o3, %g0 bz Lbotch tst %i1 /* if (v == 0) v = 1; */ bz,a 1f mov 1, %i1 1: st %i1, [%i0 + 28] /* sc.sc_o0 = v; */ mov SYS_sigreturn, %g1 mov %i0, %o0 t ST_SYSCALL /* sigreturn(scp); */ Lbotch: /* oops, caller botched it */ call _longjmperror nop unimp 0