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/* $NetBSD: __sigtramp2.S,v 1.5 2014/03/06 19:02:58 skrll Exp $ */
/*
* Copyright (c) 1998-2001 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* Portitions of this file are derived from other sources, see
* the copyrights and acknowledgements below.
*/
/*
* Copyright (c) 1990,1991,1992,1994 The University of Utah and
* the Computer Systems Laboratory (CSL). All rights reserved.
*
* THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS"
* CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES
* WHATSOEVER RESULTING FROM ITS USE.
*
* CSL requests users of this software to return to csl-dist@cs.utah.edu any
* improvements that they make and grant CSL redistribution rights.
*
* Utah $Hdr: locore.s 1.62 94/12/15$
*/
/*
* (c) Copyright 1988 HEWLETT-PACKARD COMPANY
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of Hewlett-Packard Company not be
* used in advertising or publicity pertaining to distribution
* of the software without specific, written prior permission.
* Hewlett-Packard Company makes no representations about the
* suitability of this software for any purpose.
*/
#include "SYS.h"
/*
* The hppa signal trampoline is required to call the handler
* possibily via a PLABEL.
*
* On entry, stack looks like:
*
* sp-> [x]
* r3,arg2-> ucontext structure
* arg1-> siginfo structure [0]
*
* where
* x = HPPA_FRAME_ROUND(sizeof(sigframe_siginfo))
*
* and
* struct sigframe_siginfo {
* siginfo_t sf_si;
* ucontext_t sf_uc;
* };
*/
ENTRY_NOPROFILE(__sigtramp_siginfo_2, 0)
.call
/*
* Our sendsig() places the address of the signal handler in %arg3.
* It may actually be a PLABEL.
*/
bb,>=,n %arg3, 30, L$sigcode_bounce ; branch if not a PLABEL
depi 0, 31, 2, %arg3 ; zero L bit in PLABEL pointer
ldw 4(%arg3), %r19 ; load shared library linkage
ldw 0(%arg3), %arg3 ; load real catcher address
L$sigcode_bounce:
/*
* This blr puts the address of the following nop in rp.
* It also schedules the nop for execution, which is why
* that instruction has to be a nop, or, rather, not any
* instruction only meant to execute once the signal handler
* returns.
*/
blr %r0, %rp
/*
* This bv schedules the instruction pointed to by arg3
* for execution. So, arg3 is the address of the signal
* handler.
*/
bv,n %r0(%arg3)
nop
/*
* The signal handler has returned. Since r3 is on the list
* of callee-saved registers, it's whatever the sendsig
* code wanted it set to. Since we copy it into arg0,
* it looks like sendsig leaves r3 holding the desired
* single argument to sys_setcontext, i.e., the ucontext_t *.
*/
/* Make a SYS_setcontext system call. */
copy %r3, %arg0
ldil L%SYSCALLGATE, %r1
.call
ble 4(%sr2, %r1)
ldi SYS_setcontext, %t1
/* Make a SYS_exit system call. */
copy %ret0, %arg0
ldil L%SYSCALLGATE, %r1
.call
ble 4(%sr2, %r1)
ldi SYS_exit, %t1
EXIT(__sigtramp_siginfo_2)
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