/* $NetBSD: exec_ecoff.c,v 1.17 2002/09/27 15:37:42 provos Exp $ */ /* * Copyright (c) 1994 Adam Glass * Copyright (c) 1993, 1994, 1996, 1999 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 * for the NetBSD Project. * 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 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.17 2002/09/27 15:37:42 provos Exp $"); #include #include #include #include #include #include #include #include /* * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. * * Given a proc pointer and an exec package pointer, see if the referent * of the epp is in ecoff format. Check 'standard' magic numbers for * this architecture. If that fails, return failure. * * This function 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_ecoff_makecmds(struct proc *p, struct exec_package *epp) { int error; struct ecoff_exechdr *execp = epp->ep_hdr; if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) return ENOEXEC; if (ECOFF_BADMAG(execp)) return ENOEXEC; error = (*epp->ep_esch->u.ecoff_probe_func)(p, epp); /* * if there was an error or there are already vmcmds set up, * we return. (the latter can happen if cpu_exec_ecoff_hook() * recursively invokes check_exec() to handle loading of a * dynamically linked binary's shared loader. */ if (error || epp->ep_vmcmds.evs_cnt) return (error); /* * prepare the exec package to map the executable. */ switch (execp->a.magic) { case ECOFF_OMAGIC: error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr, epp->ep_vp); break; case ECOFF_NMAGIC: error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, epp->ep_vp); break; case ECOFF_ZMAGIC: error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr, epp->ep_vp); break; default: return ENOEXEC; } /* set up the stack */ if (!error) error = exec_ecoff_setup_stack(p, epp); if (error) kill_vmcmds(&epp->ep_vmcmds); return error; } /* * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff * 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_ecoff_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 * 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; } /* * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package */ int exec_ecoff_prep_omagic(struct proc *p, struct exec_package *epp, struct ecoff_exechdr *execp, struct vnode *vp) { struct ecoff_aouthdr *eap = &execp->a; epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); epp->ep_tsize = eap->tsize; epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); epp->ep_dsize = eap->dsize + eap->bsize; epp->ep_entry = eap->entry; /* set up command for text and data segments */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, eap->tsize + eap->dsize, epp->ep_taddr, vp, ECOFF_TXTOFF(execp), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ if (eap->bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return 0; } /* * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec * package. */ int exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp, struct ecoff_exechdr *execp, struct vnode *vp) { struct ecoff_aouthdr *eap = &execp->a; epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); epp->ep_tsize = eap->tsize; epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); epp->ep_dsize = eap->dsize + eap->bsize; epp->ep_entry = eap->entry; /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, epp->ep_taddr, vp, ECOFF_TXTOFF(execp), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, epp->ep_daddr, vp, ECOFF_DATOFF(execp), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ if (eap->bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return 0; } /* * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package * * First, set 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_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp, struct ecoff_exechdr *execp, struct vnode *vp) { struct ecoff_aouthdr *eap = &execp->a; epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); epp->ep_tsize = eap->tsize; epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); epp->ep_dsize = eap->dsize + eap->bsize; epp->ep_entry = eap->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 ((eap->tsize != 0 || eap->dsize != 0) && vp->v_writecount != 0) { #ifdef DIAGNOSTIC if (vp->v_flag & VTEXT) panic("exec: a VTEXT vnode has writecount != 0"); #endif return ETXTBSY; } vp->v_flag |= VTEXT; /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, epp->ep_taddr, vp, ECOFF_TXTOFF(execp), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, epp->ep_daddr, vp, ECOFF_DATOFF(execp), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return 0; }