setjmp.S revision 1.5
1 1.5 agc /* $NetBSD: setjmp.S,v 1.5 2003/08/07 16:42:27 agc Exp $ */ 2 1.1 eeh 3 1.1 eeh /* 4 1.1 eeh * Copyright (c) 1992, 1993 5 1.1 eeh * The Regents of the University of California. All rights reserved. 6 1.1 eeh * 7 1.1 eeh * This software was developed by the Computer Systems Engineering group 8 1.1 eeh * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 eeh * contributed to Berkeley. 10 1.1 eeh * 11 1.1 eeh * Redistribution and use in source and binary forms, with or without 12 1.1 eeh * modification, are permitted provided that the following conditions 13 1.1 eeh * are met: 14 1.1 eeh * 1. Redistributions of source code must retain the above copyright 15 1.1 eeh * notice, this list of conditions and the following disclaimer. 16 1.1 eeh * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 eeh * notice, this list of conditions and the following disclaimer in the 18 1.1 eeh * documentation and/or other materials provided with the distribution. 19 1.5 agc * 3. Neither the name of the University nor the names of its contributors 20 1.1 eeh * may be used to endorse or promote products derived from this software 21 1.1 eeh * without specific prior written permission. 22 1.1 eeh * 23 1.1 eeh * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 eeh * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 eeh * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 eeh * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 eeh * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 eeh * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 eeh * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 eeh * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 eeh * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 eeh * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 eeh * SUCH DAMAGE. 34 1.1 eeh * 35 1.1 eeh * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp 36 1.1 eeh */ 37 1.1 eeh 38 1.3 eeh #define _LOCORE 39 1.1 eeh #include <machine/asm.h> 40 1.3 eeh #include <machine/frame.h> 41 1.1 eeh #if defined(LIBC_SCCS) && !defined(lint) 42 1.1 eeh #if 0 43 1.1 eeh .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" 44 1.1 eeh #else 45 1.5 agc RCSID("$NetBSD: setjmp.S,v 1.5 2003/08/07 16:42:27 agc Exp $") 46 1.1 eeh #endif 47 1.1 eeh #endif /* LIBC_SCCS and not lint */ 48 1.1 eeh 49 1.1 eeh /* 50 1.1 eeh * C library -- setjmp, longjmp 51 1.1 eeh * 52 1.1 eeh * longjmp(a,v) 53 1.1 eeh * will generate a "return(v)" from 54 1.1 eeh * the last call to 55 1.1 eeh * setjmp(a) 56 1.1 eeh * by restoring registers from the stack, 57 1.1 eeh * and a struct sigcontext, see <signal.h> 58 1.1 eeh */ 59 1.1 eeh 60 1.1 eeh #include "SYS.h" 61 1.1 eeh 62 1.3 eeh #define STACK_T_SZ 63 1.1 eeh ENTRY(setjmp) 64 1.1 eeh /* 65 1.3 eeh * We use the part of the sigcontext structure, the sp, pc, and npc fields, 66 1.3 eeh * for the sigstack call so we don't need to get our own stackframe. It 67 1.3 eeh * won't be filled out till later anyway. 68 1.1 eeh */ 69 1.3 eeh mov %o0, %o3 /* Save our jmp_buf in %o3 */ 70 1.4 eeh mov %o0, %o2 /* build sigcontext in [%o2] */ 71 1.3 eeh mov 1, %o0 /* SIG_BLOCK */ 72 1.3 eeh mov SYS_compat_13_sigprocmask13, %g1 73 1.3 eeh clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL, (sigset_t *)a) */ 74 1.1 eeh t ST_SYSCALL 75 1.3 eeh 76 1.3 eeh st %o0, [%o3 + 0x04] /* sc.sc_mask = current mask; */ 77 1.1 eeh mov SYS___sigaltstack14, %g1 78 1.3 eeh clr %o0 /* sigstack(NULL, &foo) */ 79 1.4 eeh add %o3, 0x38, %o1 /* (foo being the sigcontext14 sc_mask) */ 80 1.1 eeh t ST_SYSCALL 81 1.3 eeh 82 1.4 eeh lduw [%o3 + 0x38+0x10], %o0 /* foo.ss_flags */ 83 1.3 eeh and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */ 84 1.3 eeh st %o0, [%o3 + 0x00] /* sc.sc_onstack = current onstack; */ 85 1.3 eeh stx %sp, [%o3 + 0x08] /* sc.sc_sp = sp (both ours and caller's) */ 86 1.1 eeh add %o7, 8, %o0 87 1.3 eeh stx %o0, [%o3 + 0x10] /* sc.sc_pc = return_pc */ 88 1.1 eeh add %o7, 12, %o0 89 1.3 eeh stx %o0, [%o3 + 0x18] /* sc.sc_npc = return_pc + 4 */ 90 1.3 eeh stx %g0, [%o3 + 0x20] /* sc.sc_psr = (clean psr) */ 91 1.3 eeh stx %fp, [%o3 + 0x28] /* sc.sc_g1 = %fp (misuse, but what the heck) */ 92 1.3 eeh /* sc.sc_o0 = random(), set in longjmp */ 93 1.3 eeh retl /* return 0 */ 94 1.1 eeh clr %o0 95 1.1 eeh 96 1.1 eeh /* 97 1.1 eeh * All we need to do here is force sigreturn to load a new stack pointer, 98 1.1 eeh * new <pc,npc>, and appropriate %o0 return value from the sigcontext built 99 1.1 eeh * in setjmp. The %i and %l registers will be reloaded from the place to 100 1.1 eeh * which %sp points, due to sigreturn() semantics (sigreturn does not modify 101 1.1 eeh * the window pointer in the psr, hence it must force all windows to reload). 102 1.1 eeh */ 103 1.1 eeh ENTRY(longjmp) 104 1.3 eeh save %sp, -CC64FSZ, %sp 105 1.3 eeh ldx [%i0 + 0x08], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */ 106 1.3 eeh ldx [%i0 + 0x28], %o3 107 1.1 eeh orcc %o2, %o3, %g0 108 1.3 eeh bz,pn %xcc, Lbotch 109 1.3 eeh movrz %i1, 1, %i1 /* if (v == 0) v = 1; */ 110 1.3 eeh st %i1, [%i0 + 0x30] /* sc.sc_o0 = v; */ 111 1.3 eeh mov SYS_compat_13_sigreturn13, %g1 112 1.1 eeh mov %i0, %o0 113 1.3 eeh t ST_SYSCALL /* sigreturn(scp); */ 114 1.1 eeh 115 1.1 eeh Lbotch: 116 1.1 eeh /* oops, caller botched it */ 117 1.1 eeh call _C_LABEL(longjmperror) 118 1.1 eeh nop 119 1.1 eeh unimp 0 120
Indexes created Sat Sep 27 22:09:54 GMT 2025