263 lines
8.5 KiB
C
263 lines
8.5 KiB
C
/* $NetBSD: exec_aout.c,v 1.20 2000/11/14 22:13:20 thorpej Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1993, 1994 Christopher G. Demetriou
|
|
* 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 Christopher G. Demetriou.
|
|
* 4. 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/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/resourcevar.h>
|
|
|
|
#include <uvm/uvm_extern.h>
|
|
|
|
/*
|
|
* exec_aout_makecmds(): Check if it's an a.out-format executable.
|
|
*
|
|
* Given a proc pointer and an exec package pointer, see if the referent
|
|
* of the epp is in a.out format. First check 'standard' magic numbers for
|
|
* this architecture. If that fails, try a cpu-dependent hook.
|
|
*
|
|
* This function, in the former case, or the hook, in the latter, is
|
|
* responsible for creating a set of vmcmds which can be used to build
|
|
* the process's vm space and inserting them into the exec package.
|
|
*/
|
|
|
|
int
|
|
exec_aout_makecmds(struct proc *p, struct exec_package *epp)
|
|
{
|
|
u_long midmag, magic;
|
|
u_short mid;
|
|
int error;
|
|
struct exec *execp = epp->ep_hdr;
|
|
|
|
if (epp->ep_hdrvalid < sizeof(struct exec))
|
|
return ENOEXEC;
|
|
|
|
midmag = ntohl(execp->a_midmag);
|
|
mid = (midmag >> 16) & 0x3ff;
|
|
magic = midmag & 0xffff;
|
|
|
|
midmag = mid << 16 | magic;
|
|
|
|
switch (midmag) {
|
|
case (MID_MACHINE << 16) | ZMAGIC:
|
|
error = exec_aout_prep_zmagic(p, epp);
|
|
break;
|
|
case (MID_MACHINE << 16) | NMAGIC:
|
|
error = exec_aout_prep_nmagic(p, epp);
|
|
break;
|
|
case (MID_MACHINE << 16) | OMAGIC:
|
|
error = exec_aout_prep_omagic(p, epp);
|
|
break;
|
|
default:
|
|
error = cpu_exec_aout_makecmds(p, epp);
|
|
}
|
|
|
|
if (error)
|
|
kill_vmcmds(&epp->ep_vmcmds);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's exec package
|
|
*
|
|
* First, set of the various offsets/lengths in the exec package.
|
|
*
|
|
* Then, mark the text image busy (so it can be demand paged) or error
|
|
* out if this is not possible. Finally, set up vmcmds for the
|
|
* text, data, bss, and stack segments.
|
|
*/
|
|
|
|
int
|
|
exec_aout_prep_zmagic(struct proc *p, struct exec_package *epp)
|
|
{
|
|
struct exec *execp = epp->ep_hdr;
|
|
|
|
epp->ep_taddr = USRTEXT;
|
|
epp->ep_tsize = execp->a_text;
|
|
epp->ep_daddr = epp->ep_taddr + execp->a_text;
|
|
epp->ep_dsize = execp->a_data + execp->a_bss;
|
|
epp->ep_entry = execp->a_entry;
|
|
|
|
/*
|
|
* check if vnode is in open for writing, because we want to
|
|
* demand-page out of it. if it is, don't do it, for various
|
|
* reasons
|
|
*/
|
|
if ((execp->a_text != 0 || execp->a_data != 0) &&
|
|
epp->ep_vp->v_writecount != 0) {
|
|
#ifdef DIAGNOSTIC
|
|
if (epp->ep_vp->v_flag & VTEXT)
|
|
panic("exec: a VTEXT vnode has writecount != 0\n");
|
|
#endif
|
|
return ETXTBSY;
|
|
}
|
|
vn_marktext(epp->ep_vp);
|
|
|
|
/* set up command for text segment */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, round_page(execp->a_text),
|
|
epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
|
|
|
|
/* set up command for data segment */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, round_page(execp->a_data),
|
|
epp->ep_daddr, epp->ep_vp, execp->a_text,
|
|
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
/* set up command for bss segment */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
|
|
epp->ep_daddr + execp->a_data, NULLVP, 0,
|
|
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
return exec_aout_setup_stack(p, epp);
|
|
}
|
|
|
|
/*
|
|
* exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's exec package
|
|
*/
|
|
|
|
int
|
|
exec_aout_prep_nmagic(struct proc *p, struct exec_package *epp)
|
|
{
|
|
struct exec *execp = epp->ep_hdr;
|
|
long bsize, baddr;
|
|
|
|
epp->ep_taddr = USRTEXT;
|
|
epp->ep_tsize = execp->a_text;
|
|
epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ);
|
|
epp->ep_dsize = execp->a_data + execp->a_bss;
|
|
epp->ep_entry = execp->a_entry;
|
|
|
|
/* set up command for text segment */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
|
|
epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
|
|
VM_PROT_READ|VM_PROT_EXECUTE);
|
|
|
|
/* set up command for data segment */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
|
|
epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
|
|
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
/* set up command for bss segment */
|
|
baddr = round_page(epp->ep_daddr + execp->a_data);
|
|
bsize = epp->ep_daddr + epp->ep_dsize - baddr;
|
|
if (bsize > 0)
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
|
|
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
return exec_aout_setup_stack(p, epp);
|
|
}
|
|
|
|
/*
|
|
* exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's exec package
|
|
*/
|
|
|
|
int
|
|
exec_aout_prep_omagic(struct proc *p, struct exec_package *epp)
|
|
{
|
|
struct exec *execp = epp->ep_hdr;
|
|
long dsize, bsize, baddr;
|
|
|
|
epp->ep_taddr = USRTEXT;
|
|
epp->ep_tsize = execp->a_text;
|
|
epp->ep_daddr = epp->ep_taddr + execp->a_text;
|
|
epp->ep_dsize = execp->a_data + execp->a_bss;
|
|
epp->ep_entry = execp->a_entry;
|
|
|
|
/* set up command for text and data segments */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
|
|
execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
|
|
sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
/* set up command for bss segment */
|
|
baddr = round_page(epp->ep_daddr + execp->a_data);
|
|
bsize = epp->ep_daddr + epp->ep_dsize - baddr;
|
|
if (bsize > 0)
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
|
|
NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
/*
|
|
* Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
|
|
* obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
|
|
* computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
|
|
* respectively to page boundaries.
|
|
* Compensate `ep_dsize' for the amount of data covered by the last
|
|
* text page.
|
|
*/
|
|
dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
|
|
epp->ep_dsize = (dsize > 0) ? dsize : 0;
|
|
return exec_aout_setup_stack(p, epp);
|
|
}
|
|
|
|
/*
|
|
* exec_aout_setup_stack(): Set up the stack segment for an a.out
|
|
* executable.
|
|
*
|
|
* Note that the ep_ssize parameter must be set to be the current stack
|
|
* limit; this is adjusted in the body of execve() to yield the
|
|
* appropriate stack segment usage once the argument length is
|
|
* calculated.
|
|
*
|
|
* This function returns an int for uniformity with other (future) formats'
|
|
* stack setup functions. They might have errors to return.
|
|
*/
|
|
|
|
int
|
|
exec_aout_setup_stack(struct proc *p, struct exec_package *epp)
|
|
{
|
|
|
|
epp->ep_maxsaddr = USRSTACK - MAXSSIZ;
|
|
epp->ep_minsaddr = USRSTACK;
|
|
epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur;
|
|
|
|
/*
|
|
* set up commands for stack. note that this takes *two*, one to
|
|
* map the part of the stack which we can access, and one to map
|
|
* the part which we can't.
|
|
*
|
|
* arguably, it could be made into one, but that would require the
|
|
* addition of another mapping proc, which is unnecessary
|
|
*
|
|
* note that in memory, things assumed to be: 0 ... ep_maxsaddr
|
|
* <stack> ep_minsaddr
|
|
*/
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
|
|
((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
|
|
epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE);
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
|
|
(epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
|
|
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
|
|
return 0;
|
|
}
|