261 lines
7.3 KiB
C
261 lines
7.3 KiB
C
/*
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* Copyright (c) 1998-1999 Andrew Gallatin
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* All rights reserved.
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*
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* Based heavily on imgact_linux.c which is
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* Copyright (c) 1994-1996 Søren Schmidt.
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* Which in turn is based heavily on /sys/kern/imgact_aout.c which is:
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* Copyright (c) 1993, David Greenman
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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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* in this position and unchanged.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/malloc.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/filedesc.h>
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#include <sys/fcntl.h>
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#include <sys/resourcevar.h>
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#include <sys/exec.h>
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#include <sys/mman.h>
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#include <sys/imgact.h>
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#include <sys/imgact_aout.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/pioctl.h>
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#include <sys/namei.h>
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#include <sys/sysent.h>
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#include <sys/shm.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_extern.h>
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#include <alpha/osf1/exec_ecoff.h>
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extern struct sysentvec osf1_sysvec;
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#ifdef DEBUG
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#define DPRINTF(a) printf a;
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#else
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#define DPRINTF(a)
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#endif
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static int
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exec_osf1_imgact(struct image_params *imgp)
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{
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int error;
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int path_not_saved;
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size_t bytes;
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const struct ecoff_exechdr *execp;
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const struct ecoff_aouthdr *eap;
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struct vmspace *vmspace;
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vm_offset_t baddr;
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vm_offset_t bsize;
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vm_offset_t bss_start;
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vm_offset_t daddr;
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vm_offset_t dend;
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vm_offset_t dsize;
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vm_offset_t raw_dend;
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vm_offset_t taddr;
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vm_offset_t tend;
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vm_offset_t tsize;
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struct nameidata *ndp;
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Osf_Auxargs *osf_auxargs;
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execp = (const struct ecoff_exechdr*)imgp->image_header;
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eap = &execp->a;
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ndp = NULL;
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/* check to make sure we have an alpha ecoff executable */
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if (ECOFF_BADMAG(execp))
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return -1;
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/* verfify it an OSF/1 exectutable */
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if (eap->magic != ECOFF_ZMAGIC) {
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printf("unknown ecoff magic %x\n", eap->magic);
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return ENOEXEC;
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}
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osf_auxargs = malloc(sizeof(Osf_Auxargs), M_TEMP, M_WAITOK | M_ZERO);
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imgp->auxargs = osf_auxargs;
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osf_auxargs->executable = osf_auxargs->exec_path;
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path_not_saved = copyinstr(imgp->fname, osf_auxargs->executable,
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PATH_MAX, &bytes);
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if (execp->f.f_flags & DYNAMIC_FLAG) {
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if (path_not_saved) {
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uprintf("path to dynamic exectutable not found\n");
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free(imgp->auxargs, M_TEMP);
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return(path_not_saved);
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}
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/*
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* Unmap the executable & attempt to slide in
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* /sbin/loader in its place.
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*/
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if (imgp->firstpage)
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exec_unmap_first_page(imgp);
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/*
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* Replicate what execve does, and map the first
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* page of the loader.
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*/
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ndp = (struct nameidata *)malloc(sizeof(struct nameidata),
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M_TEMP, M_WAITOK);
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NDINIT(ndp, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE,
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"/compat/osf1/sbin/loader", imgp->proc);
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error = namei(ndp);
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if (error) {
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uprintf("imgact_osf1: can't read /compat/osf1/sbin/loader\n");
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free(imgp->auxargs, M_TEMP);
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return(error);
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}
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if (imgp->vp) {
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vrele(imgp->vp);
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/* leaking in the nameizone ??? XXX */
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}
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imgp->vp = ndp->ni_vp;
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error = exec_map_first_page(imgp);
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VOP_UNLOCK(imgp->vp, 0, imgp->proc);
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osf_auxargs->loader = "/compat/osf1/sbin/loader";
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}
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execp = (const struct ecoff_exechdr*)imgp->image_header;
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eap = &execp->a;
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taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
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tend = round_page(eap->text_start + eap->tsize);
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tsize = tend - taddr;
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daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
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dend = round_page(eap->data_start + eap->dsize);
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dsize = dend - daddr;
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bss_start = ECOFF_SEGMENT_ALIGN(execp, eap->bss_start);
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bsize = eap->bsize;
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imgp->entry_addr = eap->entry;
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/* copy in arguments and/or environment from old process */
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error = exec_extract_strings(imgp);
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if (error)
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goto bail;
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/*
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* Destroy old process VM and create a new one (with a new stack).
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*/
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mtx_lock(&vm_mtx);
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exec_new_vmspace(imgp);
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/*
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* The vm space can now be changed.
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*/
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vmspace = imgp->proc->p_vmspace;
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mtx_unlock(&vm_mtx);
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imgp->interpreted = 0;
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imgp->proc->p_sysent = &osf1_sysvec;
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if ((eap->tsize != 0 || eap->dsize != 0) &&
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imgp->vp->v_writecount != 0) {
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#ifdef DIAGNOSTIC
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if (imgp->vp->v_flag & VTEXT)
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panic("exec: a VTEXT vnode has writecount != 0\n");
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#endif
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return ETXTBSY;
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}
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imgp->vp->v_flag |= VTEXT;
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/* set up text segment */
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if ((error = vm_mmap(&vmspace->vm_map, &taddr, tsize,
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VM_PROT_READ|VM_PROT_EXECUTE, VM_PROT_ALL, MAP_FIXED|MAP_COPY,
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(caddr_t)imgp->vp, ECOFF_TXTOFF(execp)))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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return error;
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}
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/* .. data .. */
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if ((error = vm_mmap(&vmspace->vm_map, &daddr, dsize,
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VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE, VM_PROT_ALL,
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MAP_FIXED|MAP_COPY, (caddr_t)imgp->vp, ECOFF_DATOFF(execp)))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
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goto bail;
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}
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/* .. bss .. */
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if (round_page(bsize)) {
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baddr = bss_start;
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if ((error = vm_map_find(&vmspace->vm_map, NULL,
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(vm_offset_t) 0, &baddr, round_page(bsize), FALSE,
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VM_PROT_ALL, VM_PROT_ALL, FALSE))) {
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DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__,
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error));
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goto bail;
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}
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}
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raw_dend = (eap->data_start + eap->dsize);
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if (dend > raw_dend) {
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caddr_t zeros;
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zeros = malloc(dend-raw_dend,M_TEMP,M_WAITOK|M_ZERO);
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if ((error = copyout(zeros, (caddr_t)raw_dend,
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dend-raw_dend))) {
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uprintf("Can't zero start of bss, error %d\n",error);
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free(zeros,M_TEMP);
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goto bail;
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}
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free(zeros,M_TEMP);
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}
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vmspace->vm_tsize = btoc(round_page(tsize));
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vmspace->vm_dsize = btoc((round_page(dsize) + round_page(bsize)));
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vmspace->vm_taddr = (caddr_t)taddr;
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vmspace->vm_daddr = (caddr_t)daddr;
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return(0);
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bail:
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free(imgp->auxargs, M_TEMP);
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if (ndp) {
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VOP_CLOSE(ndp->ni_vp, FREAD, imgp->proc->p_ucred, imgp->proc);
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vrele(ndp->ni_vp);
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}
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return(error);
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}
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/*
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* Tell kern_execve.c about it, with a little help from the linker.
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*/
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struct execsw osf1_execsw = { exec_osf1_imgact, "OSF/1 ECOFF" };
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EXEC_SET(osf1_ecoff, osf1_execsw);
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