356 lines
10 KiB
C
356 lines
10 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@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 1.9 1998/10/09 23:15:39 peter 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/imgact_aout.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <stand.h>
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#include <a.out.h>
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#define FREEBSD_AOUT
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#include <link.h>
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#include "bootstrap.h"
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static int aout_loadimage(struct loaded_module *mp, int fd, vm_offset_t loadaddr, struct exec *ehdr, int kernel);
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#if 0
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static vm_offset_t aout_findkldident(struct loaded_module *mp, struct exec *ehdr);
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static int aout_fixupkldmod(struct loaded_module *mp, struct exec *ehdr);
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#endif
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char *aout_kerneltype = "a.out kernel";
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char *aout_moduletype = "a.out module";
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/*
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* Attempt to load the file (file) as an a.out 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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aout_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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struct exec 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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char *s;
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mp = NULL;
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/*
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* Open the image, read and validate the a.out 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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if (N_BADMAG(ehdr)) {
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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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* XXX should check N_GETMID()
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*/
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kmp = mod_findmodule(NULL, NULL);
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if ((N_GETFLAG(ehdr)) & EX_DYNAMIC) {
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/* Looks like a kld module */
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if (kmp == NULL) {
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printf("aout_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(aout_kerneltype, kmp->m_type)) {
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printf("aout_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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} else if (N_GETFLAG(ehdr) == 0) {
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/* Looks like a kernel */
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if (kmp != NULL) {
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printf("aout_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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* XXX this is i386-freebsd-aout specific
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*/
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dest = ehdr.a_entry & 0x100000;
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if (dest == 0) {
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printf("aout_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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} 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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setenv("kernelname", filename, 1);
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s = strrchr(filename, '/');
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if (s)
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mp->m_name = strdup(s + 1);
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else
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mp->m_name = strdup(filename);
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mp->m_type = strdup(kernel ? aout_kerneltype : aout_moduletype);
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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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mp->m_addr = addr; /* save the aligned load address */
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if (kernel)
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printf("%s at %p\n", filename, (void *) addr);
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mp->m_size = aout_loadimage(mp, fd, addr, &ehdr, kernel);
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if (mp->m_size == 0)
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goto ioerr;
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#if 0
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/* Handle KLD module data */
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if (!kernel && ((err = aout_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_AOUTEXEC, sizeof(struct exec), &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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free(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 exec header, load the image at (addr)
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*
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* Fixup the a_bss field in (ehdr) to reflect the padding added to
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* align the symbol table.
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*/
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static int
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aout_loadimage(struct loaded_module *mp, int fd, vm_offset_t loadaddr, struct exec *ehdr, int kernel)
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{
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u_int pad;
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vm_offset_t addr;
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int ss;
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vm_offset_t ssym, esym;
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addr = loadaddr;
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lseek(fd, N_TXTOFF(*ehdr), SEEK_SET);
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/* text segment */
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printf(" text=0x%lx ", ehdr->a_text);
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if (archsw.arch_readin(fd, addr, ehdr->a_text) != ehdr->a_text)
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return(0);
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addr += ehdr->a_text;
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/* data segment */
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printf("data=0x%lx ", ehdr->a_data);
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if (archsw.arch_readin(fd, addr, ehdr->a_data) != ehdr->a_data)
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return(0);
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addr += ehdr->a_data;
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/* For kernels, we pad the BSS to a page boundary */
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if (kernel) {
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pad = (u_int)ehdr->a_bss & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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ehdr->a_bss += pad;
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}
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}
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printf("bss=0x%lx ", ehdr->a_bss);
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addr += ehdr->a_bss;
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/* symbol table size */
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ssym = addr;
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archsw.arch_copyin(&ehdr->a_syms, addr, sizeof(ehdr->a_syms));
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addr += sizeof(ehdr->a_syms);
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/* symbol table */
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printf("symbols=[0x%x+0x%lx", sizeof(ehdr->a_syms), ehdr->a_syms);
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if (archsw.arch_readin(fd, addr, ehdr->a_syms) != ehdr->a_syms)
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return(0);
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addr += ehdr->a_syms;
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/* string table */
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read(fd, &ss, sizeof(ss));
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archsw.arch_copyin(&ss, addr, sizeof(ss));
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addr += sizeof(ss);
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ss -= sizeof(ss);
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printf("+0x%x+0x%x]", sizeof(ss), ss);
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if (archsw.arch_readin(fd, addr, ss) != ss)
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return(0);
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printf(" \n");
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addr += ss;
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esym = addr;
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mod_addmetadata(mp, MODINFOMD_SSYM, sizeof(ssym), &ssym);
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mod_addmetadata(mp, MODINFOMD_ESYM, sizeof(esym), &esym);
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return(addr - loadaddr);
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}
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#if 0
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#define AOUT_RELOC(mp, off) ((mp)->m_addr + (vm_offset_t)(off))
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/*
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* The goal here is to find the one symbol in the loaded object
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* which fits the format "kld_identifier_<something>. If there's
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* more than one, we fail.
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*/
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static vm_offset_t
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aout_findkldident(struct loaded_module *mp, struct exec *ehdr)
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{
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/* XXX much of this can go when we can address the load area directly */
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vm_offset_t sp, ep, cand, stringbase, result;
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struct _dynamic dynamic;
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struct section_dispatch_table sdt;
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struct nzlist nzl;
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char *np;
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int match;
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/* Get the _DYNAMIC object, which we assume is first in the data segment */
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archsw.arch_copyout(AOUT_RELOC(mp, ehdr->a_text), &dynamic, sizeof(dynamic));
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archsw.arch_copyout(AOUT_RELOC(mp, dynamic.d_un.d_sdt), &sdt, sizeof(struct section_dispatch_table));
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dynamic.d_un.d_sdt = &sdt; /* fix up SDT pointer */
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if (dynamic.d_version != LD_VERSION_BSD)
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return(0);
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stringbase = AOUT_RELOC(mp, LD_STRINGS(&dynamic));
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/* start pointer */
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sp = AOUT_RELOC(mp, LD_SYMBOL(&dynamic));
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/* end pointer */
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ep = sp + LD_STABSZ(&dynamic);
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/*
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* Walk the entire table comparing names.
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*/
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match = 0;
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result = 0;
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for (cand = sp; cand < ep; cand += sizeof(struct nzlist)) {
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/* get the entry, check for a name */
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archsw.arch_copyout(cand, &nzl, sizeof(struct nzlist));
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/* is this symbol worth looking at? */
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if ((nzl.nz_strx == 0) || /* no name */
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(nzl.nz_value == 0) || /* not a definition */
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((nzl.nz_type == N_UNDF+N_EXT) &&
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(nzl.nz_value != 0) &&
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(nzl.nz_other == AUX_FUNC))) /* weak function */
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continue;
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np = strdupout(stringbase + nzl.nz_strx);
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match = (np[0] == '_') && !strncmp(KLD_IDENT_SYMNAME, np + 1, strlen(KLD_IDENT_SYMNAME));
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free(np);
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if (match) {
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/* duplicates? */
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if (result)
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return(0);
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result = AOUT_RELOC(mp, nzl.nz_value);
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}
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}
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return(result);
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}
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/*
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* Perform extra housekeeping associated with loading a KLD module.
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*
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* XXX if this returns an error, it seems the heap becomes corrupted.
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*/
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static int
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aout_fixupkldmod(struct loaded_module *mp, struct exec *ehdr)
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{
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struct kld_module_identifier kident;
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struct kld_module_dependancy *kdeps;
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vm_offset_t vp;
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size_t dsize;
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/* Find the KLD identifier */
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if ((vp = aout_findkldident(mp, ehdr)) == 0) {
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printf("bad a.out module format\n");
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return(EFTYPE);
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}
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archsw.arch_copyout(vp, &kident, sizeof(struct kld_module_identifier));
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/* Name the module using the name from the KLD data */
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if (mod_findmodule(kident.ki_name, NULL) != NULL) {
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printf("module '%s' already loaded\n", kident.ki_name);
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return(EPERM);
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}
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mp->m_name = strdup(kident.ki_name);
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/* Save the module identifier */
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mod_addmetadata(mp, MODINFOMD_KLDIDENT, sizeof(struct kld_module_identifier), &kident);
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/* Look for dependancy data, add to metadata list */
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if (kident.ki_ndeps > 0) {
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dsize = kident.ki_ndeps * kident.ki_depsize;
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kdeps = malloc(dsize);
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archsw.arch_copyout(AOUT_RELOC(mp, kident.ki_deps), kdeps, dsize);
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mod_addmetadata(mp, MODINFOMD_KLDDEP, dsize, kdeps);
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free(kdeps);
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}
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return(0);
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}
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#endif
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