freebsd-skq/sys/kern/imgact_aout.c
sos 6deee3a45e First attempt to run linux binaries. This is only the changes needed to
the generic kernel. The actual emulator is a separate LKM. (not finished
yet, sorry).
Submitted by:	sos@freebsd.org & sef@kithrup.com
1995-02-14 19:23:22 +00:00

205 lines
6.0 KiB
C

/*
* Copyright (c) 1993, David Greenman
* All rights reserved.
*
* 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.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by David Greenman
* 4. The name of the developer may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* $Id: imgact_aout.c,v 1.9 1994/09/25 19:33:31 phk Exp $
*/
#include <sys/param.h>
#include <sys/systm.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/sysent.h>
#include <vm/vm.h>
int
exec_aout_imgact(iparams)
struct image_params *iparams;
{
struct exec *a_out = (struct exec *) iparams->image_header;
struct vmspace *vmspace = iparams->proc->p_vmspace;
unsigned long vmaddr, virtual_offset, file_offset;
unsigned long bss_size;
int error;
extern struct sysentvec aout_sysvec;
#ifdef COMPAT_LINUX
/*
* Linux and *BSD binaries look very much alike,
* only the machine id is different:
* 0x64 for Linux, 0x86 for *BSD.
*/
if (((a_out->a_magic >> 16) & 0xff) != 0x86)
return -1;
#endif /* COMPAT_LINUX */
/*
* Set file/virtual offset based on a.out variant.
* We do two cases: host byte order and network byte order
* (for NetBSD compatibility)
*/
switch ((int)(a_out->a_magic & 0xffff)) {
case ZMAGIC:
virtual_offset = 0;
if (a_out->a_text) {
file_offset = NBPG;
} else {
/* Bill's "screwball mode" */
file_offset = 0;
}
break;
case QMAGIC:
virtual_offset = NBPG;
file_offset = 0;
break;
default:
/* NetBSD compatibility */
switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
case ZMAGIC:
case QMAGIC:
virtual_offset = NBPG;
file_offset = 0;
break;
default:
return (-1);
}
}
bss_size = roundup(a_out->a_bss, NBPG);
/*
* Check various fields in header for validity/bounds.
*/
if (/* entry point must lay with text region */
a_out->a_entry < virtual_offset ||
a_out->a_entry >= virtual_offset + a_out->a_text ||
/* text and data size must each be page rounded */
a_out->a_text % NBPG ||
a_out->a_data % NBPG)
return (-1);
/* text + data can't exceed file size */
if (a_out->a_data + a_out->a_text > iparams->attr->va_size)
return (EFAULT);
/*
* text/data/bss must not exceed limits
*/
if (/* text can't exceed maximum text size */
a_out->a_text > MAXTSIZ ||
/* data + bss can't exceed maximum data size */
a_out->a_data + bss_size > MAXDSIZ ||
/* data + bss can't exceed rlimit */
a_out->a_data + bss_size >
iparams->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
return (ENOMEM);
/* copy in arguments and/or environment from old process */
error = exec_extract_strings(iparams);
if (error)
return (error);
/*
* Destroy old process VM and create a new one (with a new stack)
*/
exec_new_vmspace(iparams);
/*
* Map text read/execute
*/
vmaddr = virtual_offset;
error =
vm_mmap(&vmspace->vm_map, /* map */
&vmaddr, /* address */
a_out->a_text, /* size */
VM_PROT_READ | VM_PROT_EXECUTE, /* protection */
VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* max protection */
MAP_PRIVATE | MAP_FIXED, /* flags */
(caddr_t)iparams->vnodep, /* vnode */
file_offset); /* offset */
if (error)
return (error);
/*
* Map data read/write (if text is 0, assume text is in data area
* [Bill's screwball mode])
*/
vmaddr = virtual_offset + a_out->a_text;
error =
vm_mmap(&vmspace->vm_map,
&vmaddr,
a_out->a_data,
VM_PROT_READ | VM_PROT_WRITE | (a_out->a_text ? 0 : VM_PROT_EXECUTE),
VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
(caddr_t) iparams->vnodep,
file_offset + a_out->a_text);
if (error)
return (error);
/*
* Allocate demand-zeroed area for uninitialized data
* "bss" = 'block started by symbol' - named after the IBM 7090
* instruction of the same name.
*/
vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
error = vm_allocate(&vmspace->vm_map, &vmaddr, bss_size, FALSE);
if (error)
return (error);
/* Fill in process VM information */
vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
vmspace->vm_taddr = (caddr_t) virtual_offset;
vmspace->vm_daddr = (caddr_t) virtual_offset + a_out->a_text;
/* Fill in image_params */
iparams->interpreted = 0;
iparams->entry_addr = a_out->a_entry;
iparams->proc->p_sysent = &aout_sysvec;
return (0);
}
/*
* Tell kern_execve.c about it, with a little help from the linker.
* Since `const' objects end up in the text segment, TEXT_SET is the
* correct directive to use.
*/
static const struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
TEXT_SET(execsw_set, aout_execsw);