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Annotation of sys/lib/libkern/arch/sparc64/setjmp.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: setjmp.S,v 1.3 2003/06/02 23:28:09 millert Exp $      */
                      2: /*     $NetBSD: setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh 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 "$NetBSD: setjmp.S,v 1.1.1.1 1998/06/20 05:18:14 eeh 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