efca1dc5ee
so far, and should probably be able to be made to work for the alpha without too much trouble once it's connected up and my assumptions tested. I think (but have not tested) it will also load "old" ELF kernels that were not linked with DYNAMIC headers. The module glue is yet to come. (oh fun.. :-) It does not explicitly load symbols [yet]. The _DYNAMIC data contains a runtime symbol set that ddb can use via ddb/db_kld.c. It'll be missing some detail that stabs normally provides (eg: number of args to a function, line numbers, etc). On the other hand, those minimal symbols will always be available even on a stripped kernel. This is mostly stolen from load_aout.c with some ideas from alpha/libalpha/elf_freebsd.c.
277 lines
7.5 KiB
C
277 lines
7.5 KiB
C
/*-
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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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* $Id: load_aout.c,v 1.6 1998/09/26 10:51:38 dfr Exp $
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/reboot.h>
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#include <string.h>
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#include <machine/bootinfo.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 <link.h>
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#include "bootstrap.h"
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static int elf_loadimage(int fd, vm_offset_t *loadaddr, Elf_Ehdr *ehdr, int kernel);
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#if 0
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static vm_offset_t elf_findkldident(struct loaded_module *mp, Elf_Ehdr *ehdr);
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static int elf_fixupkldmod(struct loaded_module *mp, Elf_Ehdr *ehdr);
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#endif
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char *elf_kerneltype = "elf kernel";
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char *elf_moduletype = "elf module";
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/*
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* Attempt to load the file (file) as an ELF module. It will be stored at
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* (dest), and a pointer to a module structure describing the loaded object
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* will be saved in (result).
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*/
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int
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elf_loadmodule(char *filename, vm_offset_t dest, struct loaded_module **result)
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{
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struct loaded_module *mp, *kmp;
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Elf_Ehdr ehdr;
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int fd;
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vm_offset_t addr;
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int err, kernel;
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u_int pad;
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mp = NULL;
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/*
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* Open the image, read and validate the ELF header
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*/
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if (filename == NULL) /* can't handle nameless */
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return(EFTYPE);
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if ((fd = open(filename, O_RDONLY)) == -1)
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return(errno);
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if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) {
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err = EFTYPE; /* could be EIO, but may be small file */
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goto oerr;
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}
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/* Is it ELF? */
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if (!IS_ELF(ehdr)) {
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err = EFTYPE;
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goto oerr;
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}
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if (ehdr.e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */
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ehdr.e_ident[EI_DATA] != ELF_TARG_DATA ||
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ehdr.e_ident[EI_VERSION] != EV_CURRENT || /* Version ? */
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ehdr.e_version != EV_CURRENT ||
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ehdr.e_machine != ELF_TARG_MACH) { /* Machine ? */
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err = EFTYPE;
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goto oerr;
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}
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/*
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* Check to see what sort of module we are.
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*/
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kmp = mod_findmodule(NULL, NULL);
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if (ehdr.e_type == ET_DYN) {
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/* Looks like a kld module */
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if (kmp == NULL) {
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printf("elf_loadmodule: can't load module before kernel\n");
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err = EPERM;
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goto oerr;
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}
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if (strcmp(elf_kerneltype, kmp->m_type)) {
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printf("elf_loadmodule: can't load module with kernel type '%s'\n", kmp->m_type);
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err = EPERM;
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goto oerr;
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}
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/* Looks OK, got ahead */
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kernel = 0;
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/* Page-align the load address */
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addr = dest;
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pad = (u_int)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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} else if (ehdr.e_type == ET_EXEC) {
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/* Looks like a kernel */
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if (kmp != NULL) {
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printf("elf_loadmodule: kernel already loaded\n");
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err = EPERM;
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goto oerr;
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}
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/*
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* Calculate destination address based on kernel entrypoint
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*/
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dest = (vm_offset_t) ehdr.e_entry;
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if (dest == 0) {
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printf("elf_loadmodule: not a kernel (maybe static binary?)\n");
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err = EPERM;
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goto oerr;
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}
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kernel = 1;
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addr = dest;
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} else {
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err = EFTYPE;
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goto oerr;
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}
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/*
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* Ok, we think we should handle this.
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*/
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mp = mod_allocmodule();
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if (kernel)
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mp->m_name = strdup(filename); /* XXX should we prune the name? */
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mp->m_type = strdup(kernel ? elf_kerneltype : elf_moduletype);
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printf("%s at %p\n", filename, (void *) addr);
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mp->m_size = elf_loadimage(fd, &addr, &ehdr, kernel);
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if (mp->m_size == 0)
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goto ioerr;
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mp->m_addr = addr; /* save the aligned load address */
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#if 0
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/* Handle KLD module data */
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if (!kernel && ((err = elf_fixupkldmod(mp, &ehdr)) != 0))
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goto oerr;
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#endif
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/* save exec header as metadata */
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mod_addmetadata(mp, MODINFOMD_ELFHDR, sizeof(ehdr), &ehdr);
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/* Load OK, return module pointer */
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*result = (struct loaded_module *)mp;
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err = 0;
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goto out;
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ioerr:
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err = EIO;
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oerr:
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mod_discard(mp);
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out:
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close(fd);
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return(err);
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}
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/*
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* With the file (fd) open on the image, and (ehdr) containing
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* the Elf header, load the image at (addr)
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*/
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static int
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elf_loadimage(int fd, vm_offset_t *addr, Elf_Ehdr *ehdr, int kernel)
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{
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int i;
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Elf_Phdr *phdr;
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int ret;
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vm_offset_t firstaddr;
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vm_offset_t lastaddr;
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vm_offset_t off;
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void *buf;
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ret = 0;
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firstaddr = lastaddr = 0;
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if (kernel)
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#ifdef __i386__
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off = 0x10000000; /* -0xf0000000 - i386 relocates after locore */
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#else
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off = 0; /* alpha is direct mapped for kernels */
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#endif
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else
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off = *addr; /* load relative to passed address */
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phdr = malloc(ehdr->e_phnum * sizeof(*phdr));
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if (phdr == NULL)
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goto out;
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if (lseek(fd, ehdr->e_phoff, SEEK_SET) == -1) {
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printf("elf_loadexec: lseek for phdr failed\n");
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goto out;
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}
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if (read(fd, phdr, ehdr->e_phnum * sizeof(*phdr)) !=
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ehdr->e_phnum * sizeof(*phdr)) {
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printf("elf_loadexec: cannot read program header\n");
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goto out;
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}
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for (i = 0; i < ehdr->e_phnum; i++) {
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/* We want to load PT_LOAD segments only.. */
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if (phdr[i].p_type != PT_LOAD)
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continue;
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printf("segment %d: 0x%lx@0x%lx -> 0x%lx-0x%lx\n", i,
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(long)phdr[i].p_filesz, (long)phdr[i].p_offset,
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(long)(phdr[i].p_vaddr + off),
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(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz - 1));
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if (lseek(fd, phdr[i].p_offset, SEEK_SET) == -1) {
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printf("elf_loadexec: cannot seek\n");
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goto out;
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}
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if (archsw.arch_readin(fd, phdr[i].p_vaddr + off, phdr[i].p_filesz) !=
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phdr[i].p_filesz) {
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printf("elf_loadexec: archsw.readin failed\n");
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goto out;
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}
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/* clear space from oversized segments; eg: bss */
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if (phdr[i].p_filesz < phdr[i].p_memsz) {
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size_t resid, chunk;
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vm_offset_t dest;
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printf(".. extended: clearing 0x%lx-0x%lx\n",
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(long)(phdr[i].p_vaddr + off + phdr[i].p_filesz),
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(long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1));
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buf = malloc(PAGE_SIZE);
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bzero(buf, PAGE_SIZE);
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resid = phdr[i].p_memsz - phdr[i].p_filesz;
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dest = phdr[i].p_vaddr + off + phdr[i].p_filesz;
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while (resid > 0) {
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chunk = min(PAGE_SIZE, resid);
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archsw.arch_copyin(buf, dest, chunk);
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resid -= chunk;
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dest += chunk;
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}
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free(buf);
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}
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if (firstaddr < (phdr[i].p_vaddr + off))
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firstaddr = phdr[i].p_vaddr + off;
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if (lastaddr < (phdr[i].p_vaddr + off + phdr[i].p_memsz))
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lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz;
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}
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ret = lastaddr - firstaddr;
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*addr = firstaddr;
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out:
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if (phdr)
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free(phdr);
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return ret;
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}
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