1 1.1 uwe /* $NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $ */ 2 1.1 uwe 3 1.1 uwe /* 4 1.1 uwe * Copyright (c) 1992, 1993 5 1.1 uwe * The Regents of the University of California. All rights reserved. 6 1.1 uwe * 7 1.1 uwe * This software was developed by the Computer Systems Engineering group 8 1.1 uwe * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 uwe * contributed to Berkeley. 10 1.1 uwe * 11 1.1 uwe * Redistribution and use in source and binary forms, with or without 12 1.1 uwe * modification, are permitted provided that the following conditions 13 1.1 uwe * are met: 14 1.1 uwe * 1. Redistributions of source code must retain the above copyright 15 1.1 uwe * notice, this list of conditions and the following disclaimer. 16 1.1 uwe * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 uwe * notice, this list of conditions and the following disclaimer in the 18 1.1 uwe * documentation and/or other materials provided with the distribution. 19 1.1 uwe * 3. Neither the name of the University nor the names of its contributors 20 1.1 uwe * may be used to endorse or promote products derived from this software 21 1.1 uwe * without specific prior written permission. 22 1.1 uwe * 23 1.1 uwe * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 uwe * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 uwe * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 uwe * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 uwe * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 uwe * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 uwe * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 uwe * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 uwe * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 uwe * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 uwe * SUCH DAMAGE. 34 1.1 uwe * 35 1.1 uwe * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36 1.1 uwe */ 37 1.1 uwe 38 1.1 uwe #include <machine/asm.h> 39 1.1 uwe #if defined(LIBC_SCCS) && !defined(lint) 40 1.1 uwe #if 0 41 1.1 uwe .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 42 1.1 uwe #else 43 1.1 uwe RCSID("$NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $") 44 1.1 uwe #endif 45 1.1 uwe #endif /* LIBC_SCCS and not lint */ 46 1.1 uwe 47 1.1 uwe /* 48 1.1 uwe * C library -- setjmp, longjmp 49 1.1 uwe * 50 1.1 uwe * longjmp(a,v) 51 1.1 uwe * will generate a "return(v)" from 52 1.1 uwe * the last call to 53 1.1 uwe * setjmp(a) 54 1.1 uwe * by restoring registers from the stack, 55 1.1 uwe * and a struct sigcontext, see <signal.h> 56 1.1 uwe */ 57 1.1 uwe 58 1.1 uwe #include "SYS.h" 59 1.1 uwe 60 1.1 uwe ENTRY(setjmp) 61 1.1 uwe /* 62 1.1 uwe * We use the caller's `arg dump' area (%sp+0x44; there are 6 ints 63 1.1 uwe * reserved there for us) to avoid having to allocate stack space 64 1.1 uwe * here. 65 1.1 uwe */ 66 1.1 uwe mov %o0, %o2 /* build sigcontext in [%o2] */ 67 1.1 uwe mov 1, %o0 /* SIG_BLOCK */ 68 1.1 uwe mov SYS_compat_13_sigprocmask13, %g1 69 1.1 uwe clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */ 70 1.1 uwe t ST_SYSCALL 71 1.1 uwe st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */ 72 1.1 uwe mov SYS___sigaltstack14, %g1 73 1.1 uwe clr %o0 /* sigaltstack(NULL, &foo) */ 74 1.1 uwe add %sp, 0x48, %o1 /* (foo being in arg dump area) */ 75 1.1 uwe t ST_SYSCALL 76 1.1 uwe ld [%sp + 0x50], %o0 /* foo.ss_flags */ 77 1.1 uwe and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 78 1.1 uwe st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */ 79 1.1 uwe st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */ 80 1.1 uwe add %o7, 8, %o0 81 1.1 uwe st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */ 82 1.1 uwe add %o7, 12, %o0 83 1.1 uwe st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */ 84 1.1 uwe st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */ 85 1.1 uwe st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 86 1.1 uwe /* sc.sc_o0 = random(), set in longjmp */ 87 1.1 uwe retl /* return 0 */ 88 1.1 uwe clr %o0 89 1.1 uwe 90 1.1 uwe /* 91 1.1 uwe * All we need to do here is force sigreturn to load a new stack pointer, 92 1.1 uwe * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 93 1.1 uwe * in setjmp. The %i and %l registers will be reloaded from the place to 94 1.1 uwe * which %sp points, due to sigreturn() semantics (sigreturn does not modify 95 1.1 uwe * the window pointer in the psr, hence it must force all windows to reload). 96 1.1 uwe */ 97 1.1 uwe ENTRY(longjmp) 98 1.1 uwe save %sp, -96, %sp 99 1.1 uwe ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 100 1.1 uwe ld [%i0 + 24], %o3 101 1.1 uwe orcc %o2, %o3, %g0 102 1.1 uwe bz Lbotch 103 1.1 uwe tst %i1 /* if (v == 0) v = 1; */ 104 1.1 uwe bz,a 1f 105 1.1 uwe mov 1, %i1 106 1.1 uwe 1: 107 1.1 uwe st %i1, [%i0 + 28] /* sc.sc_o0 = v; */ 108 1.1 uwe mov SYS_compat_13_sigreturn13, %g1 109 1.1 uwe mov %i0, %o0 110 1.1 uwe t ST_SYSCALL /* sigreturn(scp); */ 111 1.1 uwe 112 1.1 uwe Lbotch: 113 1.1 uwe /* oops, caller botched it */ 114 1.1 uwe call _C_LABEL(longjmperror) 115 1.1 uwe nop 116 1.1 uwe unimp 0 117
Indexes created Sun Sep 21 20:09:37 GMT 2025