Annotation of sys/lib/libkern/arch/sparc/setjmp.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $ */
! 2: /* $NetBSD: setjmp.S,v 1.2 1994/10/26 06:40:08 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: *
! 36: * Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp
! 37: */
! 38:
! 39: #if defined(LIBC_SCCS) && !defined(lint)
! 40: #ifdef notdef
! 41: .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93"
! 42: #endif
! 43: .asciz "$OpenBSD: setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $"
! 44: #endif /* LIBC_SCCS and not lint */
! 45:
! 46: /*
! 47: * C library -- setjmp, longjmp
! 48: *
! 49: * longjmp(a,v)
! 50: * will generate a "return(v)" from
! 51: * the last call to
! 52: * setjmp(a)
! 53: * by restoring registers from the stack,
! 54: * and a struct sigcontext, see <signal.h>
! 55: */
! 56:
! 57: #include "SYS.h"
! 58:
! 59: ENTRY(setjmp)
! 60: /*
! 61: * We use the caller's `arg dump' area (%sp+0x44; there are 6 ints
! 62: * reserved there for us) to avoid having to allocate stack space
! 63: * here.
! 64: */
! 65: mov %o0, %o2 /* build sigcontext in [%o2] */
! 66: mov 1, %o0 /* SIG_BLOCK */
! 67: mov SYS_sigprocmask, %g1
! 68: clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */
! 69: t ST_SYSCALL
! 70: st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */
! 71: mov SYS_sigaltstack, %g1
! 72: clr %o0 /* sigstack(NULL, &foo) */
! 73: add %sp, 0x48, %o1 /* (foo being in arg dump area) */
! 74: t ST_SYSCALL
! 75: ld [%sp + 0x50], %o0 /* foo.ss_flags */
! 76: and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */
! 77: st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */
! 78: st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */
! 79: add %o7, 8, %o0
! 80: st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */
! 81: add %o7, 12, %o0
! 82: st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */
! 83: st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */
! 84: st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */
! 85: /* sc.sc_o0 = random(), set in longjmp */
! 86: retl /* return 0 */
! 87: clr %o0
! 88:
! 89: /*
! 90: * All we need to do here is force sigreturn to load a new stack pointer,
! 91: * new <pc,npc>, and appropriate %o0 return value from the sigcontext built
! 92: * in setjmp. The %i and %l registers will be reloaded from the place to
! 93: * which %sp points, due to sigreturn() semantics (sigreturn does not modify
! 94: * the window pointer in the psr, hence it must force all windows to reload).
! 95: */
! 96: ENTRY(longjmp)
! 97: save %sp, -96, %sp
! 98: ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */
! 99: ld [%i0 + 24], %o3
! 100: orcc %o2, %o3, %g0
! 101: bz Lbotch
! 102: tst %i1 /* if (v == 0) v = 1; */
! 103: bz,a 1f
! 104: mov 1, %i1
! 105: 1:
! 106: st %i1, [%i0 + 28] /* sc.sc_o0 = v; */
! 107: mov SYS_sigreturn, %g1
! 108: mov %i0, %o0
! 109: t ST_SYSCALL /* sigreturn(scp); */
! 110:
! 111: Lbotch:
! 112: /* oops, caller botched it */
! 113: call _longjmperror
! 114: nop
! 115: unimp 0
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