1*180e99b5Schristos/* $NetBSD: compat_setjmp.S,v 1.1 2005/10/16 04:41:34 christos Exp $ */ 2*180e99b5Schristos 3*180e99b5Schristos/* 4*180e99b5Schristos * Copyright (c) 1992, 1993 5*180e99b5Schristos * The Regents of the University of California. All rights reserved. 6*180e99b5Schristos * 7*180e99b5Schristos * This software was developed by the Computer Systems Engineering group 8*180e99b5Schristos * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9*180e99b5Schristos * contributed to Berkeley. 10*180e99b5Schristos * 11*180e99b5Schristos * Redistribution and use in source and binary forms, with or without 12*180e99b5Schristos * modification, are permitted provided that the following conditions 13*180e99b5Schristos * are met: 14*180e99b5Schristos * 1. Redistributions of source code must retain the above copyright 15*180e99b5Schristos * notice, this list of conditions and the following disclaimer. 16*180e99b5Schristos * 2. Redistributions in binary form must reproduce the above copyright 17*180e99b5Schristos * notice, this list of conditions and the following disclaimer in the 18*180e99b5Schristos * documentation and/or other materials provided with the distribution. 19*180e99b5Schristos * 3. Neither the name of the University nor the names of its contributors 20*180e99b5Schristos * may be used to endorse or promote products derived from this software 21*180e99b5Schristos * without specific prior written permission. 22*180e99b5Schristos * 23*180e99b5Schristos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24*180e99b5Schristos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25*180e99b5Schristos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26*180e99b5Schristos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27*180e99b5Schristos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28*180e99b5Schristos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29*180e99b5Schristos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30*180e99b5Schristos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31*180e99b5Schristos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32*180e99b5Schristos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33*180e99b5Schristos * SUCH DAMAGE. 34*180e99b5Schristos * 35*180e99b5Schristos * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36*180e99b5Schristos */ 37*180e99b5Schristos 38*180e99b5Schristos#define _LOCORE 39*180e99b5Schristos#include <machine/asm.h> 40*180e99b5Schristos#include <machine/frame.h> 41*180e99b5Schristos#if defined(LIBC_SCCS) && !defined(lint) 42*180e99b5Schristos#if 0 43*180e99b5Schristos .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 44*180e99b5Schristos#else 45*180e99b5Schristos RCSID("$NetBSD: compat_setjmp.S,v 1.1 2005/10/16 04:41:34 christos Exp $") 46*180e99b5Schristos#endif 47*180e99b5Schristos#endif /* LIBC_SCCS and not lint */ 48*180e99b5Schristos 49*180e99b5Schristos/* 50*180e99b5Schristos * C library -- setjmp, longjmp 51*180e99b5Schristos * 52*180e99b5Schristos * longjmp(a,v) 53*180e99b5Schristos * will generate a "return(v)" from 54*180e99b5Schristos * the last call to 55*180e99b5Schristos * setjmp(a) 56*180e99b5Schristos * by restoring registers from the stack, 57*180e99b5Schristos * and a struct sigcontext, see <signal.h> 58*180e99b5Schristos */ 59*180e99b5Schristos 60*180e99b5Schristos#include "SYS.h" 61*180e99b5Schristos 62*180e99b5Schristos#define STACK_T_SZ 63*180e99b5SchristosENTRY(setjmp) 64*180e99b5Schristos /* 65*180e99b5Schristos * We use the part of the sigcontext structure, the sp, pc, and npc fields, 66*180e99b5Schristos * for the sigstack call so we don't need to get our own stackframe. It 67*180e99b5Schristos * won't be filled out till later anyway. 68*180e99b5Schristos */ 69*180e99b5Schristos mov %o0, %o3 /* Save our jmp_buf in %o3 */ 70*180e99b5Schristos mov %o0, %o2 /* build sigcontext in [%o2] */ 71*180e99b5Schristos mov 1, %o0 /* SIG_BLOCK */ 72*180e99b5Schristos mov SYS_compat_13_sigprocmask13, %g1 73*180e99b5Schristos clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL, (sigset_t *)a) */ 74*180e99b5Schristos t ST_SYSCALL 75*180e99b5Schristos 76*180e99b5Schristos st %o0, [%o3 + 0x04] /* sc.sc_mask = current mask; */ 77*180e99b5Schristos mov SYS___sigaltstack14, %g1 78*180e99b5Schristos clr %o0 /* sigstack(NULL, &foo) */ 79*180e99b5Schristos add %o3, 0x38, %o1 /* (foo being the sigcontext14 sc_mask) */ 80*180e99b5Schristos t ST_SYSCALL 81*180e99b5Schristos 82*180e99b5Schristos lduw [%o3 + 0x38+0x10], %o0 /* foo.ss_flags */ 83*180e99b5Schristos and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 84*180e99b5Schristos st %o0, [%o3 + 0x00] /* sc.sc_onstack = current onstack; */ 85*180e99b5Schristos stx %sp, [%o3 + 0x08] /* sc.sc_sp = sp (both ours and caller's) */ 86*180e99b5Schristos add %o7, 8, %o0 87*180e99b5Schristos stx %o0, [%o3 + 0x10] /* sc.sc_pc = return_pc */ 88*180e99b5Schristos add %o7, 12, %o0 89*180e99b5Schristos stx %o0, [%o3 + 0x18] /* sc.sc_npc = return_pc + 4 */ 90*180e99b5Schristos stx %g0, [%o3 + 0x20] /* sc.sc_psr = (clean psr) */ 91*180e99b5Schristos stx %fp, [%o3 + 0x28] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 92*180e99b5Schristos /* sc.sc_o0 = random(), set in longjmp */ 93*180e99b5Schristos retl /* return 0 */ 94*180e99b5Schristos clr %o0 95*180e99b5Schristos 96*180e99b5Schristos/* 97*180e99b5Schristos * All we need to do here is force sigreturn to load a new stack pointer, 98*180e99b5Schristos * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 99*180e99b5Schristos * in setjmp. The %i and %l registers will be reloaded from the place to 100*180e99b5Schristos * which %sp points, due to sigreturn() semantics (sigreturn does not modify 101*180e99b5Schristos * the window pointer in the psr, hence it must force all windows to reload). 102*180e99b5Schristos */ 103*180e99b5SchristosENTRY(longjmp) 104*180e99b5Schristos save %sp, -CC64FSZ, %sp 105*180e99b5Schristos ldx [%i0 + 0x08], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 106*180e99b5Schristos ldx [%i0 + 0x28], %o3 107*180e99b5Schristos orcc %o2, %o3, %g0 108*180e99b5Schristos bz,pn %xcc, Lbotch 109*180e99b5Schristos movrz %i1, 1, %i1 /* if (v == 0) v = 1; */ 110*180e99b5Schristos st %i1, [%i0 + 0x30] /* sc.sc_o0 = v; */ 111*180e99b5Schristos mov SYS_compat_13_sigreturn13, %g1 112*180e99b5Schristos mov %i0, %o0 113*180e99b5Schristos t ST_SYSCALL /* sigreturn(scp); */ 114*180e99b5Schristos 115*180e99b5SchristosLbotch: 116*180e99b5Schristos /* oops, caller botched it */ 117*180e99b5Schristos call _C_LABEL(longjmperror) 118*180e99b5Schristos nop 119*180e99b5Schristos unimp 0 120