setjmp.S revision 1.5
1 /* $NetBSD: setjmp.S,v 1.5 2003/08/07 16:42:27 agc 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 #define _LOCORE 39 #include <machine/asm.h> 40 #include <machine/frame.h> 41 #if defined(LIBC_SCCS) && !defined(lint) 42 #if 0 43 .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 44 #else 45 RCSID("$NetBSD: setjmp.S,v 1.5 2003/08/07 16:42:27 agc Exp $") 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * C library -- setjmp, longjmp 51 * 52 * longjmp(a,v) 53 * will generate a "return(v)" from 54 * the last call to 55 * setjmp(a) 56 * by restoring registers from the stack, 57 * and a struct sigcontext, see <signal.h> 58 */ 59 60 #include "SYS.h" 61 62 #define STACK_T_SZ 63 ENTRY(setjmp) 64 /* 65 * We use the part of the sigcontext structure, the sp, pc, and npc fields, 66 * for the sigstack call so we don't need to get our own stackframe. It 67 * won't be filled out till later anyway. 68 */ 69 mov %o0, %o3 /* Save our jmp_buf in %o3 */ 70 mov %o0, %o2 /* build sigcontext in [%o2] */ 71 mov 1, %o0 /* SIG_BLOCK */ 72 mov SYS_compat_13_sigprocmask13, %g1 73 clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL, (sigset_t *)a) */ 74 t ST_SYSCALL 75 76 st %o0, [%o3 + 0x04] /* sc.sc_mask = current mask; */ 77 mov SYS___sigaltstack14, %g1 78 clr %o0 /* sigstack(NULL, &foo) */ 79 add %o3, 0x38, %o1 /* (foo being the sigcontext14 sc_mask) */ 80 t ST_SYSCALL 81 82 lduw [%o3 + 0x38+0x10], %o0 /* foo.ss_flags */ 83 and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 84 st %o0, [%o3 + 0x00] /* sc.sc_onstack = current onstack; */ 85 stx %sp, [%o3 + 0x08] /* sc.sc_sp = sp (both ours and caller's) */ 86 add %o7, 8, %o0 87 stx %o0, [%o3 + 0x10] /* sc.sc_pc = return_pc */ 88 add %o7, 12, %o0 89 stx %o0, [%o3 + 0x18] /* sc.sc_npc = return_pc + 4 */ 90 stx %g0, [%o3 + 0x20] /* sc.sc_psr = (clean psr) */ 91 stx %fp, [%o3 + 0x28] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 92 /* sc.sc_o0 = random(), set in longjmp */ 93 retl /* return 0 */ 94 clr %o0 95 96 /* 97 * All we need to do here is force sigreturn to load a new stack pointer, 98 * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 99 * in setjmp. The %i and %l registers will be reloaded from the place to 100 * which %sp points, due to sigreturn() semantics (sigreturn does not modify 101 * the window pointer in the psr, hence it must force all windows to reload). 102 */ 103 ENTRY(longjmp) 104 save %sp, -CC64FSZ, %sp 105 ldx [%i0 + 0x08], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 106 ldx [%i0 + 0x28], %o3 107 orcc %o2, %o3, %g0 108 bz,pn %xcc, Lbotch 109 movrz %i1, 1, %i1 /* if (v == 0) v = 1; */ 110 st %i1, [%i0 + 0x30] /* sc.sc_o0 = v; */ 111 mov SYS_compat_13_sigreturn13, %g1 112 mov %i0, %o0 113 t ST_SYSCALL /* sigreturn(scp); */ 114 115 Lbotch: 116 /* oops, caller botched it */ 117 call _C_LABEL(longjmperror) 118 nop 119 unimp 0 120
Indexes created Sat Sep 27 22:09:54 GMT 2025