625 lines
15 KiB
C
625 lines
15 KiB
C
/* $NetBSD: loadfile_elf32.c,v 1.29 2011/02/17 21:15:31 christos Exp $ */
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/*-
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* Copyright (c) 1997, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center and by Christos Zoulas.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS
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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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/* If not included by exec_elf64.c, ELFSIZE won't be defined. */
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#ifndef ELFSIZE
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#define ELFSIZE 32
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#endif
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#ifdef _STANDALONE
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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#else
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#endif
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#include <sys/param.h>
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#include <sys/exec.h>
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#include "loadfile.h"
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#if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \
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((ELFSIZE == 64) && defined(BOOT_ELF64))
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#define ELFROUND (ELFSIZE / 8)
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#ifndef _STANDALONE
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#include "byteorder.h"
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/*
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* Byte swapping may be necessary in the non-_STANDLONE case because
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* we may be built with a host compiler.
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*/
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#define E16(f) \
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f = (bo == ELFDATA2LSB) ? sa_htole16(f) : sa_htobe16(f)
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#define E32(f) \
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f = (bo == ELFDATA2LSB) ? sa_htole32(f) : sa_htobe32(f)
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#define E64(f) \
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f = (bo == ELFDATA2LSB) ? sa_htole64(f) : sa_htobe64(f)
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#define I16(f) \
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f = (bo == ELFDATA2LSB) ? sa_le16toh(f) : sa_be16toh(f)
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#define I32(f) \
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f = (bo == ELFDATA2LSB) ? sa_le32toh(f) : sa_be32toh(f)
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#define I64(f) \
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f = (bo == ELFDATA2LSB) ? sa_le64toh(f) : sa_be64toh(f)
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static void
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internalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
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{
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#if ELFSIZE == 32
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I16(ehdr->e_type);
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I16(ehdr->e_machine);
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I32(ehdr->e_version);
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I32(ehdr->e_entry);
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I32(ehdr->e_phoff);
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I32(ehdr->e_shoff);
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I32(ehdr->e_flags);
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I16(ehdr->e_ehsize);
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I16(ehdr->e_phentsize);
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I16(ehdr->e_phnum);
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I16(ehdr->e_shentsize);
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I16(ehdr->e_shnum);
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I16(ehdr->e_shstrndx);
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#elif ELFSIZE == 64
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I16(ehdr->e_type);
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I16(ehdr->e_machine);
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I32(ehdr->e_version);
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I64(ehdr->e_entry);
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I64(ehdr->e_phoff);
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I64(ehdr->e_shoff);
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I32(ehdr->e_flags);
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I16(ehdr->e_ehsize);
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I16(ehdr->e_phentsize);
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I16(ehdr->e_phnum);
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I16(ehdr->e_shentsize);
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I16(ehdr->e_shnum);
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I16(ehdr->e_shstrndx);
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#else
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#error ELFSIZE is not 32 or 64
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#endif
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}
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static void
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externalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
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{
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#if ELFSIZE == 32
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E16(ehdr->e_type);
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E16(ehdr->e_machine);
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E32(ehdr->e_version);
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E32(ehdr->e_entry);
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E32(ehdr->e_phoff);
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E32(ehdr->e_shoff);
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E32(ehdr->e_flags);
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E16(ehdr->e_ehsize);
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E16(ehdr->e_phentsize);
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E16(ehdr->e_phnum);
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E16(ehdr->e_shentsize);
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E16(ehdr->e_shnum);
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E16(ehdr->e_shstrndx);
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#elif ELFSIZE == 64
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E16(ehdr->e_type);
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E16(ehdr->e_machine);
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E32(ehdr->e_version);
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E64(ehdr->e_entry);
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E64(ehdr->e_phoff);
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E64(ehdr->e_shoff);
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E32(ehdr->e_flags);
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E16(ehdr->e_ehsize);
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E16(ehdr->e_phentsize);
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E16(ehdr->e_phnum);
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E16(ehdr->e_shentsize);
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E16(ehdr->e_shnum);
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E16(ehdr->e_shstrndx);
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#else
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#error ELFSIZE is not 32 or 64
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#endif
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}
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static void
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internalize_phdr(Elf_Byte bo, Elf_Phdr *phdr)
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{
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#if ELFSIZE == 32
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I32(phdr->p_type);
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I32(phdr->p_offset);
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I32(phdr->p_vaddr);
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I32(phdr->p_paddr);
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I32(phdr->p_filesz);
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I32(phdr->p_memsz);
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I32(phdr->p_flags);
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I32(phdr->p_align);
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#elif ELFSIZE == 64
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I32(phdr->p_type);
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I32(phdr->p_offset);
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I64(phdr->p_vaddr);
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I64(phdr->p_paddr);
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I64(phdr->p_filesz);
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I64(phdr->p_memsz);
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I64(phdr->p_flags);
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I64(phdr->p_align);
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#else
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#error ELFSIZE is not 32 or 64
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#endif
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}
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static void
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internalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
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{
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#if ELFSIZE == 32
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I32(shdr->sh_name);
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I32(shdr->sh_type);
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I32(shdr->sh_flags);
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I32(shdr->sh_addr);
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I32(shdr->sh_offset);
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I32(shdr->sh_size);
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I32(shdr->sh_link);
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I32(shdr->sh_info);
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I32(shdr->sh_addralign);
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I32(shdr->sh_entsize);
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#elif ELFSIZE == 64
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I32(shdr->sh_name);
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I32(shdr->sh_type);
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I64(shdr->sh_flags);
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I64(shdr->sh_addr);
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I64(shdr->sh_offset);
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I64(shdr->sh_size);
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I32(shdr->sh_link);
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I32(shdr->sh_info);
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I64(shdr->sh_addralign);
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I64(shdr->sh_entsize);
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#else
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#error ELFSIZE is not 32 or 64
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#endif
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}
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static void
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externalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
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{
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#if ELFSIZE == 32
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E32(shdr->sh_name);
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E32(shdr->sh_type);
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E32(shdr->sh_flags);
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E32(shdr->sh_addr);
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E32(shdr->sh_offset);
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E32(shdr->sh_size);
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E32(shdr->sh_link);
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E32(shdr->sh_info);
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E32(shdr->sh_addralign);
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E32(shdr->sh_entsize);
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#elif ELFSIZE == 64
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E32(shdr->sh_name);
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E32(shdr->sh_type);
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E64(shdr->sh_flags);
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E64(shdr->sh_addr);
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E64(shdr->sh_offset);
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E64(shdr->sh_size);
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E32(shdr->sh_link);
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E32(shdr->sh_info);
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E64(shdr->sh_addralign);
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E64(shdr->sh_entsize);
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#else
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#error ELFSIZE is not 32 or 64
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#endif
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}
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#else /* _STANDALONE */
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/*
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* Byte swapping is never necessary in the _STANDALONE case because
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* we are being built with the target compiler.
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*/
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#define internalize_ehdr(bo, ehdr) /* nothing */
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#define externalize_ehdr(bo, ehdr) /* nothing */
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#define internalize_phdr(bo, phdr) /* nothing */
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#define internalize_shdr(bo, shdr) /* nothing */
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#define externalize_shdr(bo, shdr) /* nothing */
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#endif /* _STANDALONE */
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int
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ELFNAMEEND(loadfile)(int fd, Elf_Ehdr *elf, u_long *marks, int flags)
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{
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Elf_Shdr *shp;
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Elf_Phdr *phdr;
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int i, j;
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ssize_t sz;
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int first;
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Elf_Addr shpp;
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Elf_Addr minp = ~0, maxp = 0, pos = 0, elfp = 0;
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u_long offset = marks[MARK_START];
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ssize_t nr;
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struct __packed {
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Elf_Nhdr nh;
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uint8_t name[ELF_NOTE_NETBSD_NAMESZ + 1];
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uint8_t desc[ELF_NOTE_NETBSD_DESCSZ];
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} note;
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char *shstr = NULL;
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int boot_load_ctf = 1;
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/* some ports dont use the offset */
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(void)&offset;
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internalize_ehdr(elf->e_ident[EI_DATA], elf);
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sz = elf->e_phnum * sizeof(Elf_Phdr);
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phdr = ALLOC(sz);
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if (lseek(fd, elf->e_phoff, SEEK_SET) == -1) {
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WARN(("lseek phdr"));
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goto freephdr;
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}
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nr = read(fd, phdr, sz);
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if (nr == -1) {
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WARN(("read program headers"));
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goto freephdr;
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}
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if (nr != sz) {
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errno = EIO;
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WARN(("read program headers"));
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goto freephdr;
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}
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for (first = 1, i = 0; i < elf->e_phnum; i++) {
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internalize_phdr(elf->e_ident[EI_DATA], &phdr[i]);
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#ifndef MD_LOADSEG /* Allow processor ABI specific segment loads */
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#define MD_LOADSEG(a) /*CONSTCOND*/0
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#endif
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if (MD_LOADSEG(&phdr[i]))
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goto loadseg;
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if (phdr[i].p_type != PT_LOAD ||
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(phdr[i].p_flags & (PF_W|PF_X)) == 0)
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continue;
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#define IS_TEXT(p) (p.p_flags & PF_X)
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#define IS_DATA(p) (p.p_flags & PF_W)
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#define IS_BSS(p) (p.p_filesz < p.p_memsz)
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/*
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* XXX: Assume first address is lowest
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*/
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if ((IS_TEXT(phdr[i]) && (flags & LOAD_TEXT)) ||
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(IS_DATA(phdr[i]) && (flags & LOAD_DATA))) {
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loadseg:
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if (marks[MARK_DATA] == 0 && IS_DATA(phdr[i]))
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marks[MARK_DATA] = LOADADDR(phdr[i].p_vaddr);
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/* Read in segment. */
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PROGRESS(("%s%lu", first ? "" : "+",
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(u_long)phdr[i].p_filesz));
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if (lseek(fd, phdr[i].p_offset, SEEK_SET) == -1) {
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WARN(("lseek text"));
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goto freephdr;
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}
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nr = READ(fd, phdr[i].p_vaddr, phdr[i].p_filesz);
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if (nr == -1) {
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WARN(("read text error"));
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goto freephdr;
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}
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if (nr != (ssize_t)phdr[i].p_filesz) {
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errno = EIO;
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WARN(("read text"));
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goto freephdr;
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}
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first = 0;
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}
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if ((IS_TEXT(phdr[i]) && (flags & (LOAD_TEXT|COUNT_TEXT))) ||
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(IS_DATA(phdr[i]) && (flags & (LOAD_DATA|COUNT_TEXT)))) {
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pos = phdr[i].p_vaddr;
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if (minp > pos)
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minp = pos;
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pos += phdr[i].p_filesz;
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if (maxp < pos)
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maxp = pos;
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}
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/* Zero out bss. */
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if (IS_BSS(phdr[i]) && (flags & LOAD_BSS)) {
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PROGRESS(("+%lu",
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(u_long)(phdr[i].p_memsz - phdr[i].p_filesz)));
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BZERO((phdr[i].p_vaddr + phdr[i].p_filesz),
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phdr[i].p_memsz - phdr[i].p_filesz);
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}
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if (IS_BSS(phdr[i]) && (flags & (LOAD_BSS|COUNT_BSS))) {
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pos += phdr[i].p_memsz - phdr[i].p_filesz;
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if (maxp < pos)
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maxp = pos;
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}
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}
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DEALLOC(phdr, sz);
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/*
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* Copy the ELF and section headers.
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*/
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maxp = roundup(maxp, ELFROUND);
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if (flags & (LOAD_HDR|COUNT_HDR)) {
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elfp = maxp;
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maxp += sizeof(Elf_Ehdr);
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}
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if (flags & (LOAD_SYM|COUNT_SYM)) {
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if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) {
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WARN(("lseek section headers"));
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return 1;
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}
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sz = elf->e_shnum * sizeof(Elf_Shdr);
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shp = ALLOC(sz);
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nr = read(fd, shp, sz);
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if (nr == -1) {
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WARN(("read section headers"));
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goto freeshp;
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}
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if (nr != sz) {
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errno = EIO;
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WARN(("read section headers"));
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goto freeshp;
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}
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shpp = maxp;
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maxp += roundup(sz, ELFROUND);
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#ifndef _STANDALONE
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/* Internalize the section headers. */
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for (i = 0; i < elf->e_shnum; i++)
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internalize_shdr(elf->e_ident[EI_DATA], &shp[i]);
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#endif /* ! _STANDALONE */
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/*
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* First load the section names section.
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*/
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if (boot_load_ctf && (elf->e_shstrndx != 0)) {
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if (flags & LOAD_SYM) {
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if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
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SEEK_SET) == -1) {
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WARN(("lseek symbols"));
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goto freeshp;
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}
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nr = READ(fd, maxp,
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shp[elf->e_shstrndx].sh_size);
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if (nr == -1) {
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WARN(("read symbols"));
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goto freeshp;
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}
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if (nr !=
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(ssize_t)shp[elf->e_shstrndx].sh_size) {
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errno = EIO;
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WARN(("read symbols"));
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goto freeshp;
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}
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shstr = ALLOC(shp[elf->e_shstrndx].sh_size);
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if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
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SEEK_SET) == -1) {
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WARN(("lseek symbols"));
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goto freeshp;
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}
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nr = read(fd, shstr,
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shp[elf->e_shstrndx].sh_size);
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if (nr == -1) {
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WARN(("read symbols"));
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goto freeshp;
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}
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}
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shp[elf->e_shstrndx].sh_offset = maxp - elfp;
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maxp += roundup(shp[elf->e_shstrndx].sh_size, ELFROUND);
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}
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/*
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* Now load the symbol sections themselves. Make sure
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* the sections are aligned. Don't bother with any
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* string table that isn't referenced by a symbol
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* table.
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*/
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for (first = 1, i = 0; i < elf->e_shnum; i++) {
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if (i == elf->e_shstrndx) {
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/* already loaded this section */
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continue;
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}
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switch (shp[i].sh_type) {
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case SHT_PROGBITS:
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if (boot_load_ctf && shstr) {
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/* got a CTF section? */
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if (strncmp(".SUNW_ctf",
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&shstr[shp[i].sh_name],
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10) == 0) {
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goto havesym;
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}
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}
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/* Not loading this, so zero out the offset. */
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shp[i].sh_offset = 0;
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break;
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case SHT_STRTAB:
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for (j = 0; j < elf->e_shnum; j++)
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if (shp[j].sh_type == SHT_SYMTAB &&
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shp[j].sh_link == (unsigned int)i)
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goto havesym;
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/* FALLTHROUGH */
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default:
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/* Not loading this, so zero out the offset. */
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shp[i].sh_offset = 0;
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break;
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havesym:
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case SHT_SYMTAB:
|
|
if (flags & LOAD_SYM) {
|
|
PROGRESS(("%s%ld", first ? " [" : "+",
|
|
(u_long)shp[i].sh_size));
|
|
if (lseek(fd, shp[i].sh_offset,
|
|
SEEK_SET) == -1) {
|
|
WARN(("lseek symbols"));
|
|
goto freeshp;
|
|
}
|
|
nr = READ(fd, maxp, shp[i].sh_size);
|
|
if (nr == -1) {
|
|
WARN(("read symbols"));
|
|
goto freeshp;
|
|
}
|
|
if (nr != (ssize_t)shp[i].sh_size) {
|
|
errno = EIO;
|
|
WARN(("read symbols"));
|
|
goto freeshp;
|
|
}
|
|
}
|
|
shp[i].sh_offset = maxp - elfp;
|
|
maxp += roundup(shp[i].sh_size, ELFROUND);
|
|
first = 0;
|
|
break;
|
|
case SHT_NOTE:
|
|
if ((flags & LOAD_NOTE) == 0)
|
|
break;
|
|
if (shp[i].sh_size < sizeof(note)) {
|
|
shp[i].sh_offset = 0;
|
|
break;
|
|
}
|
|
if (lseek(fd, shp[i].sh_offset, SEEK_SET)
|
|
== -1) {
|
|
WARN(("lseek note"));
|
|
goto freeshp;
|
|
}
|
|
nr = read(fd, ¬e, sizeof(note));
|
|
if (nr == -1) {
|
|
WARN(("read note"));
|
|
goto freeshp;
|
|
}
|
|
if (note.nh.n_namesz ==
|
|
ELF_NOTE_NETBSD_NAMESZ &&
|
|
note.nh.n_descsz ==
|
|
ELF_NOTE_NETBSD_DESCSZ &&
|
|
note.nh.n_type ==
|
|
ELF_NOTE_TYPE_NETBSD_TAG &&
|
|
memcmp(note.name, ELF_NOTE_NETBSD_NAME,
|
|
sizeof(note.name)) == 0) {
|
|
memcpy(&netbsd_version, ¬e.desc,
|
|
sizeof(netbsd_version));
|
|
}
|
|
shp[i].sh_offset = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (flags & LOAD_SYM) {
|
|
#ifndef _STANDALONE
|
|
/* Externalize the section headers. */
|
|
for (i = 0; i < elf->e_shnum; i++)
|
|
externalize_shdr(elf->e_ident[EI_DATA],
|
|
&shp[i]);
|
|
#endif /* ! _STANDALONE */
|
|
BCOPY(shp, shpp, sz);
|
|
|
|
if (first == 0)
|
|
PROGRESS(("]"));
|
|
}
|
|
DEALLOC(shp, sz);
|
|
}
|
|
|
|
if (shstr) {
|
|
DEALLOC(shstr, shp[elf->e_shstrndx].sh_size);
|
|
}
|
|
|
|
/*
|
|
* Frob the copied ELF header to give information relative
|
|
* to elfp.
|
|
*/
|
|
if (flags & LOAD_HDR) {
|
|
elf->e_phoff = 0;
|
|
elf->e_shoff = sizeof(Elf_Ehdr);
|
|
elf->e_phentsize = 0;
|
|
elf->e_phnum = 0;
|
|
externalize_ehdr(elf->e_ident[EI_DATA], elf);
|
|
BCOPY(elf, elfp, sizeof(*elf));
|
|
internalize_ehdr(elf->e_ident[EI_DATA], elf);
|
|
}
|
|
|
|
marks[MARK_START] = LOADADDR(minp);
|
|
marks[MARK_ENTRY] = LOADADDR(elf->e_entry);
|
|
/*
|
|
* Since there can be more than one symbol section in the code
|
|
* and we need to find strtab too in order to do anything
|
|
* useful with the symbols, we just pass the whole elf
|
|
* header back and we let the kernel debugger find the
|
|
* location and number of symbols by itself.
|
|
*/
|
|
marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */
|
|
marks[MARK_SYM] = LOADADDR(elfp);
|
|
marks[MARK_END] = LOADADDR(maxp);
|
|
return 0;
|
|
freephdr:
|
|
DEALLOC(phdr, sz);
|
|
return 1;
|
|
freeshp:
|
|
DEALLOC(shp, sz);
|
|
return 1;
|
|
}
|
|
|
|
#ifdef TEST
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <err.h>
|
|
#include <stdio.h>
|
|
u_int32_t netbsd_version;
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd;
|
|
u_long marks[MARK_MAX];
|
|
Elf_Ehdr elf;
|
|
if (argc != 2) {
|
|
(void)fprintf(stderr, "Usage: %s <file>\n", getprogname());
|
|
return 1;
|
|
}
|
|
if ((fd = open(argv[1], O_RDONLY)) == -1)
|
|
err(1, "Can't open `%s'", argv[1]);
|
|
if (read(fd, &elf, sizeof(elf)) != sizeof(elf))
|
|
err(1, "Can't read `%s'", argv[1]);
|
|
memset(marks, 0, sizeof(marks));
|
|
marks[MARK_START] = (u_long)malloc(2LL * 1024 * 2024 * 1024);
|
|
ELFNAMEEND(loadfile)(fd, &elf, marks, LOAD_ALL);
|
|
printf("%d\n", netbsd_version);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */
|