115 lines
4.2 KiB
ArmAsm
115 lines
4.2 KiB
ArmAsm
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp
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* $Id: setjmp.s,v 1.1 1993/09/05 22:18:02 deraadt Exp $
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93"
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#endif /* LIBC_SCCS and not lint */
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/*
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* C library -- setjmp, longjmp
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*
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* longjmp(a,v)
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* will generate a "return(v)" from
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* the last call to
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* setjmp(a)
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* by restoring registers from the stack,
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* and a struct sigcontext, see <signal.h>
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*/
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#include "SYS.h"
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ENTRY(setjmp)
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/*
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* We use the caller's `arg dump' area (%sp+0x44; there are 6 ints
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* reserved there for us) to avoid having to allocate stack space
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* here.
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*/
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mov %o0, %o2 /* build sigcontext in [%o2] */
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mov 1, %o0 /* SIG_BLOCK */
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mov SYS_sigprocmask, %g1
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clr %o1 /* sigprocmask(SIG_BLOCK, (sigset_t *)NULL) */
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t ST_SYSCALL
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st %o0, [%o2 + 4] /* sc.sc_mask = current mask; */
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mov SYS_sigaltstack, %g1
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clr %o0 /* sigstack(NULL, &foo) */
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add %sp, 0x48, %o1 /* (foo being in arg dump area) */
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t ST_SYSCALL
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ld [%sp + 0x50], %o0 /* foo.ss_flags */
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and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */
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st %o0, [%o2 + 0] /* sc.sc_onstack = current onstack; */
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st %sp, [%o2 + 8] /* sc.sc_sp = sp (both ours and caller's) */
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add %o7, 8, %o0
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st %o0, [%o2 + 12] /* sc.sc_pc = return_pc */
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add %o7, 12, %o0
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st %o0, [%o2 + 16] /* sc.sc_npc = return_pc + 4 */
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st %g0, [%o2 + 20] /* sc.sc_psr = (clean psr) */
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st %fp, [%o2 + 24] /* sc.sc_g1 = %fp (misuse, but what the heck) */
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/* sc.sc_o0 = random(), set in longjmp */
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retl /* return 0 */
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clr %o0
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/*
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* All we need to do here is force sigreturn to load a new stack pointer,
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* new <pc,npc>, and appropriate %o0 return value from the sigcontext built
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* in setjmp. The %i and %l registers will be reloaded from the place to
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* which %sp points, due to sigreturn() semantics (sigreturn does not modify
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* the window pointer in the psr, hence it must force all windows to reload).
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*/
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ENTRY(longjmp)
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save %sp, -96, %sp
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ld [%i0 + 8], %o2 /* make sure sc->sc_sp, sc->sc_fp nonzero */
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ld [%i0 + 24], %o3
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orcc %o2, %o3, %g0
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bz Lbotch
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tst %i1 /* if (v == 0) v = 1; */
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bz,a 1f
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mov 1, %i1
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1:
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st %i1, [%i0 + 28] /* sc.sc_o0 = v; */
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mov SYS_sigreturn, %g1
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mov %i0, %o0
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t ST_SYSCALL /* sigreturn(scp); */
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Lbotch:
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/* oops, caller botched it */
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call _longjmperror
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nop
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unimp 0
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