1 /* $NetBSD: compat_setjmp.S,v 1.1 2005/10/16 04:41:34 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
35 * from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp
39 #include <machine/asm.h>
40 #include <machine/frame.h>
41 #if defined(LIBC_SCCS) && !defined(lint)
43 .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93"
45 RCSID("$NetBSD: compat_setjmp.S,v 1.1 2005/10/16 04:41:34 christos Exp $")
47 #endif /* LIBC_SCCS and not lint */
50 * C library -- setjmp, longjmp
53 * will generate a "return(v)" from
56 * by restoring registers from the stack,
57 * and a struct sigcontext, see <signal.h>
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.
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) */
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) */
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) */
87 stx %o0, [%o3 + 0x10] /* sc.sc_pc = return_pc */
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 */
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).
104 save %sp, -CC64FSZ, %sp
105 ldx [%i0 + 0x08], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */
106 ldx [%i0 + 0x28], %o3
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
113 t ST_SYSCALL /* sigreturn(scp); */
116 /* oops, caller botched it */
117 call _C_LABEL(longjmperror)