FreeBSD-5.3/sys/alpha/osf1/imgact_osf1.c
/*
* Copyright (c) 1998-1999 Andrew Gallatin
* All rights reserved.
*
* Based heavily on imgact_linux.c which is
* Copyright (c) 1994-1996 Søren Schmidt.
* Which in turn is based heavily on /sys/kern/imgact_aout.c which is:
* Copyright (c) 1993, David Greenman
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/alpha/osf1/imgact_osf1.c,v 1.20 2003/08/22 07:20:27 imp Exp $");
#include <sys/types.h>
#include <sys/malloc.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/resourcevar.h>
#include <sys/exec.h>
#include <sys/mman.h>
#include <sys/imgact.h>
#include <sys/imgact_aout.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/pioctl.h>
#include <sys/namei.h>
#include <sys/sysent.h>
#include <sys/shm.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <alpha/osf1/exec_ecoff.h>
extern struct sysentvec osf1_sysvec;
#ifdef DEBUG
#define DPRINTF(a) printf a;
#else
#define DPRINTF(a)
#endif
static int
exec_osf1_imgact(struct image_params *imgp)
{
int error;
int path_not_saved;
size_t bytes;
const struct ecoff_exechdr *execp;
const struct ecoff_aouthdr *eap;
struct vmspace *vmspace;
vm_offset_t baddr;
vm_offset_t bsize;
vm_offset_t bss_start;
vm_offset_t daddr;
vm_offset_t dend;
vm_offset_t dsize;
vm_offset_t raw_dend;
vm_offset_t taddr;
vm_offset_t tend;
vm_offset_t tsize;
struct nameidata *ndp;
Osf_Auxargs *osf_auxargs;
struct thread *td;
GIANT_REQUIRED;
execp = (const struct ecoff_exechdr*)imgp->image_header;
eap = &execp->a;
ndp = NULL;
td = FIRST_THREAD_IN_PROC(imgp->proc);
/* check to make sure we have an alpha ecoff executable */
if (ECOFF_BADMAG(execp))
return -1;
/* verfify it an OSF/1 exectutable */
if (eap->magic != ECOFF_ZMAGIC) {
printf("unknown ecoff magic %x\n", eap->magic);
return ENOEXEC;
}
osf_auxargs = malloc(sizeof(Osf_Auxargs), M_TEMP, M_WAITOK | M_ZERO);
imgp->auxargs = osf_auxargs;
osf_auxargs->executable = osf_auxargs->exec_path;
path_not_saved = copyinstr(imgp->fname, osf_auxargs->executable,
PATH_MAX, &bytes);
if (execp->f.f_flags & DYNAMIC_FLAG) {
if (path_not_saved) {
uprintf("path to dynamic exectutable not found\n");
free(imgp->auxargs, M_TEMP);
return(path_not_saved);
}
/*
* Unmap the executable & attempt to slide in
* /sbin/loader in its place.
*/
if (imgp->firstpage)
exec_unmap_first_page(imgp);
/*
* Replicate what execve does, and map the first
* page of the loader.
*/
ndp = (struct nameidata *)malloc(sizeof(struct nameidata),
M_TEMP, M_WAITOK);
NDINIT(ndp, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE,
"/compat/osf1/sbin/loader", td);
error = namei(ndp);
if (error) {
uprintf("imgact_osf1: can't read /compat/osf1/sbin/loader\n");
free(imgp->auxargs, M_TEMP);
free(ndp, M_TEMP);
return(error);
}
NDFREE(ndp, NDF_ONLY_PNBUF);
if (imgp->vp) {
vput(imgp->vp);
/* leaking in the nameizone ??? XXX */
}
imgp->vp = ndp->ni_vp;
error = exec_map_first_page(imgp);
osf_auxargs->loader = "/compat/osf1/sbin/loader";
}
execp = (const struct ecoff_exechdr*)imgp->image_header;
eap = &execp->a;
taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
tend = round_page(eap->text_start + eap->tsize);
tsize = tend - taddr;
daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
dend = round_page(eap->data_start + eap->dsize);
dsize = dend - daddr;
bss_start = ECOFF_SEGMENT_ALIGN(execp, eap->bss_start);
bsize = eap->bsize;
imgp->entry_addr = eap->entry;
/* copy in arguments and/or environment from old process */
error = exec_extract_strings(imgp);
if (error)
goto bail;
/*
* Destroy old process VM and create a new one (with a new stack).
*/
exec_new_vmspace(imgp, &osf1_sysvec);
/*
* The vm space can now be changed.
*/
vmspace = imgp->proc->p_vmspace;
imgp->interpreted = 0;
imgp->proc->p_sysent = &osf1_sysvec;
/* set up text segment */
if ((error = vm_mmap(&vmspace->vm_map, &taddr, tsize,
VM_PROT_READ|VM_PROT_EXECUTE, VM_PROT_ALL, MAP_FIXED|MAP_COPY,
(caddr_t)imgp->vp, ECOFF_TXTOFF(execp)))) {
DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
goto bail;
}
/* .. data .. */
if ((error = vm_mmap(&vmspace->vm_map, &daddr, dsize,
VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE, VM_PROT_ALL,
MAP_FIXED|MAP_COPY, (caddr_t)imgp->vp, ECOFF_DATOFF(execp)))) {
DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
goto bail;
}
/* .. bss .. */
if (round_page(bsize)) {
baddr = bss_start;
if ((error = vm_map_find(&vmspace->vm_map, NULL,
(vm_offset_t) 0, &baddr, round_page(bsize), FALSE,
VM_PROT_ALL, VM_PROT_ALL, FALSE))) {
DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__,
error));
goto bail;
}
}
raw_dend = (eap->data_start + eap->dsize);
if (dend > raw_dend) {
caddr_t zeros;
zeros = malloc(dend-raw_dend,M_TEMP,M_WAITOK|M_ZERO);
if ((error = copyout(zeros, (caddr_t)raw_dend,
dend-raw_dend))) {
uprintf("Can't zero start of bss, error %d\n",error);
free(zeros,M_TEMP);
goto bail;
}
free(zeros,M_TEMP);
}
vmspace->vm_tsize = btoc(round_page(tsize));
vmspace->vm_dsize = btoc((round_page(dsize) + round_page(bsize)));
vmspace->vm_taddr = (caddr_t)taddr;
vmspace->vm_daddr = (caddr_t)daddr;
return(0);
bail:
free(imgp->auxargs, M_TEMP);
if (ndp) {
VOP_CLOSE(ndp->ni_vp, FREAD, td->td_ucred, td);
vrele(ndp->ni_vp);
free(ndp, M_TEMP);
}
return(error);
}
/*
* Tell kern_execve.c about it, with a little help from the linker.
*/
struct execsw osf1_execsw = { exec_osf1_imgact, "OSF/1 ECOFF" };
EXEC_SET(osf1_ecoff, osf1_execsw);