115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/* $NetBSD: alpha_reloc.c,v 1.2 2001/12/14 00:53:07 thorpej Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "rtld.h"
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#include "debug.h"
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#ifdef RTLD_DEBUG_ALPHA
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#define adbg(x) if (dodebug) xprintf x
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#else
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#define adbg(x) /* nothing */
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#endif
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/*
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* _rtld_setup_alpha_pltgot:
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*
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* Set up the Alpha pltgot glue.
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*/
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void
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_rtld_setup_alpha_pltgot(const Obj_Entry *obj, bool dodebug)
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{
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uint32_t word0;
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/*
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* The PLTGOT on the Alpha looks like this:
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*
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* PLT HEADER
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* .
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* . 32 bytes
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* .
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* PLT ENTRY #0
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* .
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* . 12 bytes
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* .
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* PLT ENTRY #1
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* .
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* . 12 bytes
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* .
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* etc.
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*
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* The old-format entries look like (displacements filled in
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* by the linker):
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*
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* ldah $28, 0($31) # 0x279f0000
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* lda $28, 0($28) # 0x239c0000
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* br $31, plt0 # 0xc3e00000
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*
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* The new-format entries look like:
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*
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* br $28, plt0 # 0xc3800000
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* # 0x00000000
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* # 0x00000000
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*
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* What we do is fetch the first PLT entry and check to
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* see the first word of it matches the first word of the
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* old format. If so, we use a binding routine that can
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* handle the old format, otherwise we use a binding routine
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* that handles the new format.
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*
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* Note that this is done on a per-object basis, we can mix
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* and match shared objects build with both the old and new
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* linker.
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*/
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word0 = *(uint32_t *)(((char *) obj->pltgot) + 32);
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if ((word0 & 0xffff0000) == 0x279f0000) {
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/* Old PLT entry format. */
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adbg(("ALPHA: object %p has old PLT format\n", obj));
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start_old;
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obj->pltgot[3] = (Elf_Addr) obj;
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return;
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}
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/* New PLT entry format. */
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adbg(("ALPHA: object %p has new PLT format\n", obj));
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obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
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obj->pltgot[3] = (Elf_Addr) obj;
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}
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