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eabe020579
In r291668, an instruction was added to sigcode64.S without the nop pad at the end being taken out. Due to alignment, this means that a dword is being wasted on the shared page for no reason. Take out this nop, and add some comments while I'm here. Reviewed by: jhibbits Sponsored by: Tag1 Consulting, Inc. Differential Revision: https://reviews.freebsd.org/D23055
80 lines
2.9 KiB
ArmAsm
80 lines
2.9 KiB
ArmAsm
/* $FreeBSD$ */
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/* $NetBSD: sigcode.S,v 1.1 1999/11/17 14:56:11 kleink Exp $ */
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/*-
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#include <sys/syscall.h>
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#include "assym.inc"
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/*
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* The following code gets copied to the top of the user stack on process
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* execution. It does signal trampolining on signal delivery.
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*
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* On entry r1 points to a struct sigframe at bottom of current stack.
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* All other registers are unchanged.
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*
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* Entered midway through for v2 ELF binaries that don't need to deal with
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* function descriptors.
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*
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*/
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.globl CNAME(sigcode64),CNAME(szsigcode64)
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.globl CNAME(sigcode64_elfv2),CNAME(szsigcode64_elfv2)
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CNAME(sigcode64):
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mflr 2 /* resolve function descriptor */
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ld 0,0(2)
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ld 2,8(2)
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mtlr 0
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CNAME(sigcode64_elfv2):
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addi 1,1,-112 /* reserved space for callee */
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mflr 12 /* ELFv2 wants the address in r12 */
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blrl
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addi 3,1,112+SF_UC /* restore sp, and get &frame->sf_uc */
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li 0,SYS_sigreturn
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sc /* sigreturn(scp) */
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/*
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* If we get back to here, it means sigreturn failed.
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* As such, we are now stuck in the wrong context.
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* Exit immediately without touching the stack.
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*/
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li 0,SYS_exit
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sc /* exit(errno) */
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endsigcode64:
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.data
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CNAME(szsigcode64):
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.long endsigcode64 - CNAME(sigcode64)
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CNAME(szsigcode64_elfv2):
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.long endsigcode64 - CNAME(sigcode64_elfv2)
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