1*eb9395f8Suwe/* $NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $ */ 2*eb9395f8Suwe 3*eb9395f8Suwe/* 4*eb9395f8Suwe * Copyright (c) 1992, 1993 5*eb9395f8Suwe * The Regents of the University of California. All rights reserved. 6*eb9395f8Suwe * 7*eb9395f8Suwe * This software was developed by the Computer Systems Engineering group 8*eb9395f8Suwe * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9*eb9395f8Suwe * contributed to Berkeley. 10*eb9395f8Suwe * 11*eb9395f8Suwe * Redistribution and use in source and binary forms, with or without 12*eb9395f8Suwe * modification, are permitted provided that the following conditions 13*eb9395f8Suwe * are met: 14*eb9395f8Suwe * 1. Redistributions of source code must retain the above copyright 15*eb9395f8Suwe * notice, this list of conditions and the following disclaimer. 16*eb9395f8Suwe * 2. Redistributions in binary form must reproduce the above copyright 17*eb9395f8Suwe * notice, this list of conditions and the following disclaimer in the 18*eb9395f8Suwe * documentation and/or other materials provided with the distribution. 19*eb9395f8Suwe * 3. Neither the name of the University nor the names of its contributors 20*eb9395f8Suwe * may be used to endorse or promote products derived from this software 21*eb9395f8Suwe * without specific prior written permission. 22*eb9395f8Suwe * 23*eb9395f8Suwe * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24*eb9395f8Suwe * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25*eb9395f8Suwe * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26*eb9395f8Suwe * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27*eb9395f8Suwe * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28*eb9395f8Suwe * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29*eb9395f8Suwe * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30*eb9395f8Suwe * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31*eb9395f8Suwe * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32*eb9395f8Suwe * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33*eb9395f8Suwe * SUCH DAMAGE. 34*eb9395f8Suwe * 35*eb9395f8Suwe * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36*eb9395f8Suwe */ 37*eb9395f8Suwe 38*eb9395f8Suwe#include <machine/asm.h> 39*eb9395f8Suwe#if defined(LIBC_SCCS) && !defined(lint) 40*eb9395f8Suwe#if 0 41*eb9395f8Suwe .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 42*eb9395f8Suwe#else 43*eb9395f8Suwe RCSID("$NetBSD: compat_setjmp.S,v 1.1 2005/10/15 22:11:22 uwe Exp $") 44*eb9395f8Suwe#endif 45*eb9395f8Suwe#endif /* LIBC_SCCS and not lint */ 46*eb9395f8Suwe 47*eb9395f8Suwe/* 48*eb9395f8Suwe * C library -- setjmp, longjmp 49*eb9395f8Suwe * 50*eb9395f8Suwe * longjmp(a,v) 51*eb9395f8Suwe * will generate a "return(v)" from 52*eb9395f8Suwe * the last call to 53*eb9395f8Suwe * setjmp(a) 54*eb9395f8Suwe * by restoring registers from the stack, 55*eb9395f8Suwe * and a struct sigcontext, see <signal.h> 56*eb9395f8Suwe */ 57*eb9395f8Suwe 58*eb9395f8Suwe#include "SYS.h" 59*eb9395f8Suwe 60*eb9395f8SuweENTRY(setjmp) 61*eb9395f8Suwe /* 62*eb9395f8Suwe * We use the caller's `arg dump' area (%sp+0x44; there are 6 ints 63*eb9395f8Suwe * reserved there for us) to avoid having to allocate stack space 64*eb9395f8Suwe * here. 65*eb9395f8Suwe */ 66*eb9395f8Suwe mov %o0, %o2 /* build sigcontext in [%o2] */ 67*eb9395f8Suwe mov 1, %o0 /* SIG_BLOCK */ 68*eb9395f8Suwe mov SYS_compat_13_sigprocmask13, %g1 69*eb9395f8Suwe clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */ 70*eb9395f8Suwe t ST_SYSCALL 71*eb9395f8Suwe st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */ 72*eb9395f8Suwe mov SYS___sigaltstack14, %g1 73*eb9395f8Suwe clr %o0 /* sigaltstack(NULL, &foo) */ 74*eb9395f8Suwe add %sp, 0x48, %o1 /* (foo being in arg dump area) */ 75*eb9395f8Suwe t ST_SYSCALL 76*eb9395f8Suwe ld [%sp + 0x50], %o0 /* foo.ss_flags */ 77*eb9395f8Suwe and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 78*eb9395f8Suwe st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */ 79*eb9395f8Suwe st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */ 80*eb9395f8Suwe add %o7, 8, %o0 81*eb9395f8Suwe st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */ 82*eb9395f8Suwe add %o7, 12, %o0 83*eb9395f8Suwe st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */ 84*eb9395f8Suwe st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */ 85*eb9395f8Suwe st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 86*eb9395f8Suwe /* sc.sc_o0 = random(), set in longjmp */ 87*eb9395f8Suwe retl /* return 0 */ 88*eb9395f8Suwe clr %o0 89*eb9395f8Suwe 90*eb9395f8Suwe/* 91*eb9395f8Suwe * All we need to do here is force sigreturn to load a new stack pointer, 92*eb9395f8Suwe * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 93*eb9395f8Suwe * in setjmp. The %i and %l registers will be reloaded from the place to 94*eb9395f8Suwe * which %sp points, due to sigreturn() semantics (sigreturn does not modify 95*eb9395f8Suwe * the window pointer in the psr, hence it must force all windows to reload). 96*eb9395f8Suwe */ 97*eb9395f8SuweENTRY(longjmp) 98*eb9395f8Suwe save %sp, -96, %sp 99*eb9395f8Suwe ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 100*eb9395f8Suwe ld [%i0 + 24], %o3 101*eb9395f8Suwe orcc %o2, %o3, %g0 102*eb9395f8Suwe bz Lbotch 103*eb9395f8Suwe tst %i1 /* if (v == 0) v = 1; */ 104*eb9395f8Suwe bz,a 1f 105*eb9395f8Suwe mov 1, %i1 106*eb9395f8Suwe1: 107*eb9395f8Suwe st %i1, [%i0 + 28] /* sc.sc_o0 = v; */ 108*eb9395f8Suwe mov SYS_compat_13_sigreturn13, %g1 109*eb9395f8Suwe mov %i0, %o0 110*eb9395f8Suwe t ST_SYSCALL /* sigreturn(scp); */ 111*eb9395f8Suwe 112*eb9395f8SuweLbotch: 113*eb9395f8Suwe /* oops, caller botched it */ 114*eb9395f8Suwe call _C_LABEL(longjmperror) 115*eb9395f8Suwe nop 116*eb9395f8Suwe unimp 0 117