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Annotation of sys/compat/bsdos/bsdos_exec.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: bsdos_exec.c,v 1.4 2001/11/06 19:53:17 miod Exp $     */
                      2:
                      3: /*
                      4:  * Copyright (c) 1993, 1994 Christopher G. Demetriou
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *      This product includes software developed by Christopher G. Demetriou.
                     18:  * 4. The name of the author may not be used to endorse or promote products
                     19:  *    derived from this software without specific prior written permission
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     22:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     23:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     24:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     25:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     26:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     27:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     28:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     29:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     30:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     31:  */
                     32:
                     33: #include <sys/param.h>
                     34: #include <sys/systm.h>
                     35: #include <sys/proc.h>
                     36: #include <sys/signalvar.h>
                     37: #include <sys/malloc.h>
                     38: #include <sys/vnode.h>
                     39: #include <sys/exec.h>
                     40: #include <sys/resourcevar.h>
                     41: #include <uvm/uvm_extern.h>
                     42:
                     43: #if 0
                     44: #include <machine/bsdos_machdep.h>
                     45: #endif
                     46:
                     47: #include <compat/bsdos/bsdos_exec.h>
                     48: #include <compat/bsdos/bsdos_syscall.h>
                     49:
                     50: extern struct sysent bsdos_sysent[];
                     51: #ifdef SYSCALL_DEBUG
                     52: extern char *bsdos_syscallnames[];
                     53: #endif
                     54:
                     55: extern char sigcode[], esigcode[];
                     56:
                     57: struct emul emul_bsdos = {
                     58:        "bsdos",
                     59:        NULL,
                     60:        sendsig,
                     61:        BSDOS_SYS_syscall,
                     62:        BSDOS_SYS_MAXSYSCALL,
                     63:        bsdos_sysent,
                     64: #ifdef SYSCALL_DEBUG
                     65:        bsdos_syscallnames,
                     66: #else
                     67:        NULL,
                     68: #endif
                     69:        0,
                     70:        copyargs,
                     71:        setregs,
                     72:        NULL,
                     73:        sigcode,
                     74:        esigcode,
                     75: };
                     76:
                     77: /*
                     78:  * exec_aout_makecmds(): Check if it's an a.out-format executable.
                     79:  *
                     80:  * Given a proc pointer and an exec package pointer, see if the referent
                     81:  * of the epp is in a.out format.  First check 'standard' magic numbers for
                     82:  * this architecture.  If that fails, try a cpu-dependent hook.
                     83:  *
                     84:  * This function, in the former case, or the hook, in the latter, is
                     85:  * responsible for creating a set of vmcmds which can be used to build
                     86:  * the process's vm space and inserting them into the exec package.
                     87:  */
                     88:
                     89: int
                     90: exec_bsdos_aout_makecmds(p, epp)
                     91:        struct proc *p;
                     92:        struct exec_package *epp;
                     93: {
                     94:        u_long midmag, magic;
                     95:        u_short mid;
                     96:        int error = ENOEXEC;
                     97:        struct exec *execp = epp->ep_hdr;
                     98:
                     99:        if (epp->ep_hdrvalid < sizeof(struct exec))
                    100:                return ENOEXEC;
                    101:
                    102:        midmag = ntohl(execp->a_midmag);
                    103:        mid = (midmag >> 16) & 0xffff;
                    104:        magic = midmag & 0xffff;
                    105:
                    106:        if (magic == 0) {
                    107:                magic = (execp->a_midmag & 0xffff);
                    108:                mid = MID_BSDOS;
                    109:        }
                    110:
                    111:        midmag = mid << 16 | magic;
                    112:
                    113:        switch (midmag) {
                    114:        case (MID_BSDOS << 16) | ZMAGIC:
                    115:                /*
                    116:                 * 386BSD's ZMAGIC format:
                    117:                 */
                    118:                error = exec_aout_prep_oldzmagic(p, epp);
                    119:                break;
                    120:        case (MID_BSDOS << 16) | QMAGIC:
                    121:                /*
                    122:                 * BSDI's QMAGIC format:
                    123:                 * same as new ZMAGIC format, but with different magic number.
                    124:                 */
                    125:                error = exec_aout_prep_zmagic(p, epp);
                    126:                break;
                    127:        case (MID_BSDOS << 16) | NMAGIC:
                    128:                /*
                    129:                 * BSDI's NMAGIC format:
                    130:                 * same as NMAGIC format, but with different magic number
                    131:                 * and with text starting at 0.
                    132:                 */
                    133:                error = exec_aout_prep_oldnmagic(p, epp);
                    134:                break;
                    135:        case (MID_BSDOS << 16) | OMAGIC:
                    136:                /*
                    137:                 * BSDI's OMAGIC format:
                    138:                 * same as OMAGIC format, but with different magic number
                    139:                 * and with text starting at 0.
                    140:                 */
                    141:                error = exec_aout_prep_oldomagic(p, epp);
                    142:                break;
                    143:        }
                    144:        if (error == 0)
                    145:                epp->ep_emul = &emul_bsdos;
                    146:        else
                    147:                kill_vmcmds(&epp->ep_vmcmds);
                    148:
                    149:        return error;
                    150: }