261 lines
8.3 KiB
C
261 lines
8.3 KiB
C
/* $NetBSD: exec_ecoff.c,v 1.22 2003/06/29 22:31:16 fvdl Exp $ */
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/*
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* Copyright (c) 1994 Adam Glass
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* Copyright (c) 1993, 1994, 1996, 1999 Christopher G. Demetriou
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.22 2003/06/29 22:31:16 fvdl Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <sys/resourcevar.h>
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#include <sys/exec_ecoff.h>
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/*
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* exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
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*
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* Given a proc pointer and an exec package pointer, see if the referent
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* of the epp is in ecoff format. Check 'standard' magic numbers for
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* this architecture. If that fails, return failure.
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*
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* This function is responsible for creating a set of vmcmds which can be
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* used to build the process's vm space and inserting them into the exec
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* package.
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*/
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int
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exec_ecoff_makecmds(struct proc *p, struct exec_package *epp)
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{
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int error;
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struct ecoff_exechdr *execp = epp->ep_hdr;
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if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
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return ENOEXEC;
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if (ECOFF_BADMAG(execp))
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return ENOEXEC;
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error = (*epp->ep_esch->u.ecoff_probe_func)(p, epp);
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/*
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* if there was an error or there are already vmcmds set up,
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* we return. (the latter can happen if cpu_exec_ecoff_hook()
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* recursively invokes check_exec() to handle loading of a
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* dynamically linked binary's shared loader.
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*/
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if (error || epp->ep_vmcmds.evs_cnt)
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return (error);
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/*
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* prepare the exec package to map the executable.
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*/
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switch (execp->a.magic) {
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case ECOFF_OMAGIC:
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error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr,
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epp->ep_vp);
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break;
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case ECOFF_NMAGIC:
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error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr,
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epp->ep_vp);
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break;
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case ECOFF_ZMAGIC:
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error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr,
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epp->ep_vp);
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break;
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default:
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return ENOEXEC;
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}
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/* set up the stack */
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if (!error)
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error = exec_ecoff_setup_stack(p, epp);
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if (error)
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kill_vmcmds(&epp->ep_vmcmds);
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return error;
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}
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/*
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* exec_ecoff_setup_stack(): Set up the stack segment for an ecoff
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* executable.
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*
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* Note that the ep_ssize parameter must be set to be the current stack
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* limit; this is adjusted in the body of execve() to yield the
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* appropriate stack segment usage once the argument length is
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* calculated.
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*
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* This function returns an int for uniformity with other (future) formats'
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* stack setup functions. They might have errors to return.
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*/
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int
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exec_ecoff_setup_stack(struct proc *p, struct exec_package *epp)
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{
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epp->ep_maxsaddr = USRSTACK - MAXSSIZ;
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epp->ep_minsaddr = USRSTACK;
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epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur;
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/*
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* set up commands for stack. note that this takes *two*, one to
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* map the part of the stack which we can access, and one to map
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* the part which we can't.
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*
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* arguably, it could be made into one, but that would require the
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* addition of another mapping proc, which is unnecessary
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*
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* note that in memory, things assumed to be: 0 ... ep_maxsaddr
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* <stack> ep_minsaddr
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*/
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
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((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
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epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE);
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
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(epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return 0;
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}
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/*
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* exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package
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*/
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int
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exec_ecoff_prep_omagic(struct proc *p, struct exec_package *epp,
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struct ecoff_exechdr *execp, struct vnode *vp)
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{
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struct ecoff_aouthdr *eap = &execp->a;
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epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
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epp->ep_tsize = eap->tsize;
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epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
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epp->ep_dsize = eap->dsize + eap->bsize;
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epp->ep_entry = eap->entry;
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/* set up command for text and data segments */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
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eap->tsize + eap->dsize, epp->ep_taddr, vp,
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ECOFF_TXTOFF(execp),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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if (eap->bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
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ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return 0;
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}
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/*
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* exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec
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* package.
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*/
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int
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exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp,
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struct ecoff_exechdr *execp, struct vnode *vp)
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{
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struct ecoff_aouthdr *eap = &execp->a;
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epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
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epp->ep_tsize = eap->tsize;
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epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ);
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epp->ep_dsize = eap->dsize + eap->bsize;
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epp->ep_entry = eap->entry;
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize,
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epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize,
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epp->ep_daddr, vp, ECOFF_DATOFF(execp),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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if (eap->bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
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ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return 0;
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}
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/*
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* exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package
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*
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* First, set the various offsets/lengths in the exec package.
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*
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* Then, mark the text image busy (so it can be demand paged) or error
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* out if this is not possible. Finally, set up vmcmds for the
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* text, data, bss, and stack segments.
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*/
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int
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exec_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp,
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struct ecoff_exechdr *execp, struct vnode *vp)
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{
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struct ecoff_aouthdr *eap = &execp->a;
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int error;
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epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
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epp->ep_tsize = eap->tsize;
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epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
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epp->ep_dsize = eap->dsize + eap->bsize;
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epp->ep_entry = eap->entry;
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error = vn_marktext(vp);
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if (error)
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return (error);
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize,
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epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize,
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epp->ep_daddr, vp, ECOFF_DATOFF(execp),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
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ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return 0;
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}
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