01e7964d6f
When using kldxref on kernel modules built with clang8 + lld8, kldxref would be unable to find the modules metadata information, because PowerPC64 was using the ef_nop.c implementation of ef_reloc(). When GNU LD was used, it was also relocating the metadata section of the .ko file. LLD does not do this, but only generate dynamic relocations for it. With minor changes, ef_powerpc.c can now work for PowerPC64 too. Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D19370
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Peter Grehan.
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* Copyright 1996-1998 John D. Polstra.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <machine/elf.h>
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#include <err.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <string.h>
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#include "ef.h"
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#ifdef __powerpc64__
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#define PRI_ELF_SIZE PRIu64
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#else
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#define PRI_ELF_SIZE PRIu32
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#endif
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/*
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* Apply relocations to the values obtained from the file. `relbase' is the
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* target relocation address of the section, and `dataoff/len' is the region
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* that is to be relocated, and has been copied to *dest
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*/
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int
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ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
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Elf_Off dataoff, size_t len, void *dest)
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{
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Elf_Addr *where, addend;
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Elf_Size rtype;
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const Elf_Rela *rela;
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if (reltype != EF_RELOC_RELA)
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return (EINVAL);
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rela = (const Elf_Rela *)reldata;
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where = (Elf_Addr *) ((Elf_Off)dest - dataoff + rela->r_offset);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
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return (0);
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switch (rtype) {
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case R_PPC_RELATIVE: /* word32|doubleword64 B + A */
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*where = relbase + addend;
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break;
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default:
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warnx("unhandled relocation type %" PRI_ELF_SIZE, rtype);
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}
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return (0);
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}
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