Annotation of sys/compat/freebsd/freebsd_exec.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: freebsd_exec.c,v 1.17 2006/01/19 17:54:50 mickey Exp $ */
! 2: /* $NetBSD: freebsd_exec.c,v 1.2 1996/05/18 16:02:08 christos Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993, 1994 Christopher G. Demetriou
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Christopher G. Demetriou.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: #include <sys/param.h>
! 35: #include <sys/systm.h>
! 36: #include <sys/proc.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: #include <sys/exec_elf.h>
! 43: #include <sys/exec_olf.h>
! 44:
! 45: #include <machine/freebsd_machdep.h>
! 46:
! 47: #include <compat/freebsd/freebsd_syscall.h>
! 48: #include <compat/freebsd/freebsd_exec.h>
! 49: #include <compat/freebsd/freebsd_util.h>
! 50:
! 51: extern struct sysent freebsd_sysent[];
! 52: #ifdef SYSCALL_DEBUG
! 53: extern char *freebsd_syscallnames[];
! 54: #endif
! 55:
! 56: extern const char freebsd_emul_path[];
! 57:
! 58: struct emul emul_freebsd_aout = {
! 59: "freebsd",
! 60: NULL,
! 61: freebsd_sendsig,
! 62: FREEBSD_SYS_syscall,
! 63: FREEBSD_SYS_MAXSYSCALL,
! 64: freebsd_sysent,
! 65: #ifdef SYSCALL_DEBUG
! 66: freebsd_syscallnames,
! 67: #else
! 68: NULL,
! 69: #endif
! 70: 0,
! 71: copyargs,
! 72: setregs,
! 73: NULL,
! 74: freebsd_sigcode,
! 75: freebsd_esigcode,
! 76: };
! 77:
! 78: struct emul emul_freebsd_elf = {
! 79: "freebsd",
! 80: NULL,
! 81: freebsd_sendsig,
! 82: FREEBSD_SYS_syscall,
! 83: FREEBSD_SYS_MAXSYSCALL,
! 84: freebsd_sysent,
! 85: #ifdef SYSCALL_DEBUG
! 86: freebsd_syscallnames,
! 87: #else
! 88: NULL,
! 89: #endif
! 90: FREEBSD_ELF_AUX_ARGSIZ,
! 91: elf32_copyargs,
! 92: setregs,
! 93: exec_elf32_fixup,
! 94: freebsd_sigcode,
! 95: freebsd_esigcode,
! 96: };
! 97:
! 98: /*
! 99: * exec_aout_makecmds(): Check if it's an a.out-format executable.
! 100: *
! 101: * Given a proc pointer and an exec package pointer, see if the referent
! 102: * of the epp is in a.out format. First check 'standard' magic numbers for
! 103: * this architecture. If that fails, try a cpu-dependent hook.
! 104: *
! 105: * This function, in the former case, or the hook, in the latter, is
! 106: * responsible for creating a set of vmcmds which can be used to build
! 107: * the process's vm space and inserting them into the exec package.
! 108: */
! 109:
! 110: int
! 111: exec_freebsd_aout_makecmds(p, epp)
! 112: struct proc *p;
! 113: struct exec_package *epp;
! 114: {
! 115: u_long midmag;
! 116: int error = ENOEXEC;
! 117: struct exec *execp = epp->ep_hdr;
! 118:
! 119: if (epp->ep_hdrvalid < sizeof(struct exec))
! 120: return ENOEXEC;
! 121:
! 122: midmag = FREEBSD_N_GETMID(*execp) << 16 | FREEBSD_N_GETMAGIC(*execp);
! 123:
! 124: /* assume FreeBSD's MID_MACHINE and [ZQNO]MAGIC is same as NetBSD's */
! 125: switch (midmag) {
! 126: case (MID_MACHINE << 16) | ZMAGIC:
! 127: error = exec_aout_prep_oldzmagic(p, epp);
! 128: break;
! 129: case (MID_MACHINE << 16) | QMAGIC:
! 130: error = exec_aout_prep_zmagic(p, epp);
! 131: break;
! 132: case (MID_MACHINE << 16) | NMAGIC:
! 133: error = exec_aout_prep_nmagic(p, epp);
! 134: break;
! 135: case (MID_MACHINE << 16) | OMAGIC:
! 136: error = exec_aout_prep_omagic(p, epp);
! 137: break;
! 138: }
! 139: if (error == 0)
! 140: epp->ep_emul = &emul_freebsd_aout;
! 141: else
! 142: kill_vmcmds(&epp->ep_vmcmds);
! 143:
! 144: return error;
! 145: }
! 146:
! 147: int
! 148: exec_freebsd_elf32_makecmds(struct proc *p, struct exec_package *epp)
! 149: {
! 150: if (!(emul_freebsd_elf.e_flags & EMUL_ENABLED))
! 151: return (ENOEXEC);
! 152: return exec_elf32_makecmds(p, epp);
! 153:
! 154: }
! 155:
! 156: int
! 157: freebsd_elf_probe(p, epp, itp, pos, os)
! 158: struct proc *p;
! 159: struct exec_package *epp;
! 160: char *itp;
! 161: u_long *pos;
! 162: u_int8_t *os;
! 163: {
! 164: Elf32_Ehdr *eh = epp->ep_hdr;
! 165: char *bp, *brand;
! 166: int error;
! 167: size_t len;
! 168:
! 169: /*
! 170: * Older FreeBSD ELF binaries use a brand; newer ones use EI_OSABI
! 171: */
! 172: if (eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD) {
! 173: brand = elf32_check_brand(eh);
! 174: if (brand == NULL || strcmp(brand, "FreeBSD") != 0)
! 175: return (EINVAL);
! 176: }
! 177: if (itp) {
! 178: if ((error = emul_find(p, NULL, freebsd_emul_path, itp, &bp, 0)))
! 179: return (error);
! 180: if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
! 181: return (error);
! 182: free(bp, M_TEMP);
! 183: }
! 184: epp->ep_emul = &emul_freebsd_elf;
! 185: *pos = ELF32_NO_ADDR;
! 186: if (*os == OOS_NULL)
! 187: *os = OOS_FREEBSD;
! 188: return (0);
! 189: }
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