f6f0b849fb
There is no need to keep multiple copies of the relocation code. The amd64 code works on arm64 with a few small changes to relocation types. Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D28213
222 lines
6.1 KiB
C
222 lines
6.1 KiB
C
/*-
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* Copyright (c) 2003 Jake Burkholder.
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* Copyright 1996-1998 John D. Polstra.
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <machine/elf.h>
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#include <stand.h>
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#define FREEBSD_ELF
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#include <sys/link_elf.h>
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#include "bootstrap.h"
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#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
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/*
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* Apply a single intra-module relocation to the data. `relbase' is the
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* target relocation base for the section (i.e. it corresponds to where
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* r_offset == 0). `dataaddr' is the relocated address corresponding to
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* the start of the data, and `len' is the number of bytes.
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*/
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int
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__elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata,
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int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
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{
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#if (defined(__aarch64__) || defined(__amd64__) || defined(__i386__)) && \
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__ELF_WORD_SIZE == 64
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Elf64_Addr *where, val;
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Elf_Addr addend, addr;
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Elf_Size rtype, symidx;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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switch (reltype) {
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case ELF_RELOC_REL:
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rel = (const Elf_Rel *)reldata;
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where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
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dataaddr);
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addend = 0;
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rtype = ELF_R_TYPE(rel->r_info);
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symidx = ELF_R_SYM(rel->r_info);
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addend = 0;
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break;
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case ELF_RELOC_RELA:
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rela = (const Elf_Rela *)reldata;
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where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
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dataaddr);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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symidx = ELF_R_SYM(rela->r_info);
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break;
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default:
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return (EINVAL);
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}
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if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
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return (0);
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if (reltype == ELF_RELOC_REL)
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addend = *where;
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#if defined(__aarch64__)
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#define RELOC_RELATIVE R_AARCH64_RELATIVE
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#define RELOC_IRELATIVE R_AARCH64_IRELATIVE
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#elif defined(__amd64__) || defined(__i386__)
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/* XXX, definitions not available on i386. */
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#define R_X86_64_64 1
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#define R_X86_64_RELATIVE 8
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#define R_X86_64_IRELATIVE 37
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#define RELOC_RELATIVE R_X86_64_RELATIVE
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#define RELOC_IRELATIVE R_X86_64_IRELATIVE
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#endif
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switch (rtype) {
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case RELOC_RELATIVE:
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addr = (Elf_Addr)addend + relbase;
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val = addr;
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memcpy(where, &val, sizeof(val));
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break;
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case RELOC_IRELATIVE:
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/* leave it to kernel */
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break;
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#if defined(__amd64__) || defined(__i386__)
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case R_X86_64_64: /* S + A */
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addr = symaddr(ef, symidx);
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if (addr == 0)
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return (ESRCH);
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val = addr + addend;
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*where = val;
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break;
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#endif
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default:
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printf("\nunhandled relocation type %u\n", (u_int)rtype);
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return (EFTYPE);
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}
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return (0);
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#elif defined(__i386__) && __ELF_WORD_SIZE == 32
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Elf_Addr addend, addr, *where, val;
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Elf_Size rtype, symidx;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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switch (reltype) {
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case ELF_RELOC_REL:
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rel = (const Elf_Rel *)reldata;
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where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
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dataaddr);
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addend = 0;
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rtype = ELF_R_TYPE(rel->r_info);
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symidx = ELF_R_SYM(rel->r_info);
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addend = 0;
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break;
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case ELF_RELOC_RELA:
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rela = (const Elf_Rela *)reldata;
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where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
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dataaddr);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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symidx = ELF_R_SYM(rela->r_info);
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break;
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default:
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return (EINVAL);
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}
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if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
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return (0);
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if (reltype == ELF_RELOC_REL)
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addend = *where;
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/* XXX, definitions not available on amd64. */
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#define R_386_32 1 /* Add symbol value. */
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#define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
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#define R_386_RELATIVE 8 /* Add load address of shared object. */
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#define R_386_IRELATIVE 42
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switch (rtype) {
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case R_386_RELATIVE:
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addr = addend + relbase;
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*where = addr;
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break;
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case R_386_32: /* S + A */
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addr = symaddr(ef, symidx);
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if (addr == 0)
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return (ESRCH);
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val = addr + addend;
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*where = val;
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break;
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case R_386_IRELATIVE:
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/* leave it to kernel */
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break;
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default:
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printf("\nunhandled relocation type %u\n", (u_int)rtype);
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return (EFTYPE);
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}
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return (0);
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#elif defined(__powerpc__) || defined(__riscv)
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Elf_Size w;
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const Elf_Rela *rela;
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switch (reltype) {
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case ELF_RELOC_RELA:
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rela = reldata;
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if (relbase + rela->r_offset >= dataaddr &&
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relbase + rela->r_offset < dataaddr + len) {
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switch (ELF_R_TYPE(rela->r_info)) {
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#if defined(__powerpc__)
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case R_PPC_RELATIVE:
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#elif defined(__riscv)
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case R_RISCV_RELATIVE:
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#endif
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w = relbase + rela->r_addend;
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bcopy(&w, (u_char *)data + (relbase +
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rela->r_offset - dataaddr), sizeof(w));
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break;
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default:
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printf("\nunhandled relocation type %u\n",
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(u_int)ELF_R_TYPE(rela->r_info));
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return (EFTYPE);
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}
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}
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break;
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}
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return (0);
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#else
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return (EOPNOTSUPP);
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#endif
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}
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