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netbsd32_exec_elf32.c revision 1.4 
      1 /*	$NetBSD: netbsd32_exec_elf32.c,v 1.4 2001/02/14 18:21:44 eeh Exp $	*/
      2 /*	from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
      3 
      4 /*
      5  * Copyright (c) 1998 Matthew R. Green.
      6  * Copyright (c) 1993, 1994 Christopher G. Demetriou
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed by Christopher G. Demetriou.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #define	ELFSIZE		32
     36 
     37 #include <sys/param.h>
     38 #include <sys/systm.h>
     39 #include <sys/proc.h>
     40 #include <sys/malloc.h>
     41 #include <sys/vnode.h>
     42 #include <sys/exec.h>
     43 #include <sys/exec_elf.h>
     44 #include <sys/resourcevar.h>
     45 #include <sys/signal.h>
     46 #include <sys/signalvar.h>
     47 
     48 #include <compat/netbsd32/netbsd32.h>
     49 #include <compat/netbsd32/netbsd32_exec.h>
     50 
     51 #include <machine/frame.h>
     52 #include <machine/netbsd32_machdep.h>
     53 
     54 int netbsd32_copyinargs __P((struct exec_package *, struct ps_strings *,
     55 			     void *, size_t, const void *, const void *));
     56 
     57 extern int ELFNAME2(netbsd,signature) __P((struct proc *, struct exec_package *,
     58     Elf_Ehdr *));
     59 
     60 int
     61 ELFNAME2(netbsd32,probe)(p, epp, eh, itp, pos)
     62 	struct proc *p;
     63 	struct exec_package *epp;
     64 	void *eh;
     65 	char *itp;
     66 	vaddr_t *pos;
     67 {
     68 	int error;
     69 	size_t i;
     70 	const char *bp;
     71 
     72 	if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0)
     73 		return error;
     74 
     75 	if (itp[0]) {
     76 		if ((error = emul_find(p, NULL, epp->ep_esch->es_emul->e_path,
     77 				       itp, &bp, 0)) &&
     78 		    (error = emul_find(p, NULL, "", itp, &bp, 0)))
     79 			return error;
     80 		if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0)
     81 			return error;
     82 		free((void *)bp, M_TEMP);
     83 	}
     84 	epp->ep_flags |= EXEC_32;
     85 	epp->ep_vm_minaddr = VM_MIN_ADDRESS;
     86 	epp->ep_vm_maxaddr = USRSTACK32;
     87 	*pos = ELFDEFNNAME(NO_ADDR);
     88 	return 0;
     89 }
     90 
     91 /* round up and down to page boundaries. */
     92 #define	ELF_ROUND(a, b)		(((a) + (b) - 1) & ~((b) - 1))
     93 #define	ELF_TRUNC(a, b)		((a) & ~((b) - 1))
     94 
     95 /*
     96  * Copy arguments onto the stack in the normal way, but add some
     97  * extra information in case of dynamic binding.
     98  */
     99 void *
    100 netbsd32_elf32_copyargs(pack, arginfo, stack, argp)
    101 	struct exec_package *pack;
    102 	struct ps_strings *arginfo;
    103 	void *stack;
    104 	void *argp;
    105 {
    106 	size_t len;
    107 	AuxInfo ai[ELF_AUX_ENTRIES], *a;
    108 	struct elf_args *ap;
    109 
    110 	stack = netbsd32_copyargs(pack, arginfo, stack, argp);
    111 	if (!stack)
    112 		return NULL;
    113 
    114 	a = ai;
    115 
    116 	/*
    117 	 * Push extra arguments on the stack needed by dynamically
    118 	 * linked binaries
    119 	 */
    120 	if ((ap = (struct elf_args *)pack->ep_emul_arg)) {
    121 
    122 		a->a_type = AT_PHDR;
    123 		a->a_v = ap->arg_phaddr;
    124 		a++;
    125 
    126 		a->a_type = AT_PHENT;
    127 		a->a_v = ap->arg_phentsize;
    128 		a++;
    129 
    130 		a->a_type = AT_PHNUM;
    131 		a->a_v = ap->arg_phnum;
    132 		a++;
    133 
    134 		a->a_type = AT_PAGESZ;
    135 		a->a_v = NBPG;
    136 		a++;
    137 
    138 		a->a_type = AT_BASE;
    139 		a->a_v = ap->arg_interp;
    140 		a++;
    141 
    142 		a->a_type = AT_FLAGS;
    143 		a->a_v = 0;
    144 		a++;
    145 
    146 		a->a_type = AT_ENTRY;
    147 		a->a_v = ap->arg_entry;
    148 		a++;
    149 
    150 		free((char *)ap, M_TEMP);
    151 		pack->ep_emul_arg = NULL;
    152 	}
    153 
    154 	a->a_type = AT_NULL;
    155 	a->a_v = 0;
    156 	a++;
    157 
    158 	len = (a - ai) * sizeof(AuxInfo);
    159 	if (copyout(ai, stack, len))
    160 		return NULL;
    161 	stack = (caddr_t)stack + len;
    162 
    163 	return stack;
    164 }
    165