1/* $NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36 */ 37 38#include <machine/asm.h> 39#if defined(LIBC_SCCS) && !defined(lint) 40#if 0 41 .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 42#else 43 RCSID("$NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $") 44#endif 45#endif /* LIBC_SCCS and not lint */ 46 47/* 48 * C library -- setjmp, longjmp 49 * 50 * longjmp(a,v) 51 * will generate a "return(v)" from 52 * the last call to 53 * setjmp(a) 54 * by restoring registers from the stack, 55 * and a struct sigcontext, see <signal.h> 56 */ 57 58#include "SYS.h" 59 60ENTRY(setjmp) 61 /* 62 * We use the caller's `arg dump' area (%sp+0x44; there are 6 ints 63 * reserved there for us) to avoid having to allocate stack space 64 * here. 65 */ 66 mov %o0, %o2 /* build sigcontext in [%o2] */ 67 mov 1, %o0 /* SIG_BLOCK */ 68 mov SYS_compat_13_sigprocmask13, %g1 69 clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */ 70 t ST_SYSCALL 71 st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */ 72 mov SYS___sigaltstack14, %g1 73 clr %o0 /* sigaltstack(NULL, &foo) */ 74 add %sp, 0x48, %o1 /* (foo being in arg dump area) */ 75 t ST_SYSCALL 76 ld [%sp + 0x50], %o0 /* foo.ss_flags */ 77 and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 78 st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */ 79 st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */ 80 add %o7, 8, %o0 81 st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */ 82 add %o7, 12, %o0 83 st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */ 84 st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */ 85 st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 86 /* sc.sc_o0 = random(), set in longjmp */ 87 retl /* return 0 */ 88 clr %o0 89 90/* 91 * All we need to do here is force sigreturn to load a new stack pointer, 92 * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 93 * in setjmp. The %i and %l registers will be reloaded from the place to 94 * which %sp points, due to sigreturn() semantics (sigreturn does not modify 95 * the window pointer in the psr, hence it must force all windows to reload). 96 */ 97ENTRY(longjmp) 98 save %sp, -96, %sp 99 ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 100 ld [%i0 + 24], %o3 101 orcc %o2, %o3, %g0 102 bz Lbotch 103 tst %i1 /* if (v == 0) v = 1; */ 104 bz,a 1f 105 mov 1, %i1 1061: 107 st %i1, [%i0 + 28] /* sc.sc_o0 = v; */ 108 mov SYS_compat_13_sigreturn13, %g1 109 mov %i0, %o0 110 t ST_SYSCALL /* sigreturn(scp); */ 111 112Lbotch: 113 /* oops, caller botched it */ 114 call _C_LABEL(longjmperror) 115 nop 116 unimp 0 117