643 lines
16 KiB
C
643 lines
16 KiB
C
/* $NetBSD: svr4_exec.c,v 1.5 1994/10/24 17:37:36 deraadt Exp $ */
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/*
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* Copyright (c) 1994 Christos Zoulas
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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. 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/param.h>
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#include <sys/systm.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/resourcevar.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_pager.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <machine/exec.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_exec.h>
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#define SVR4_ALIGN(a, b) ((a) & ~((b) - 1))
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#define SVR4_PAGESIZE 4096
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#define SVR4_AUX_ARGSIZ (sizeof(AuxInfo) * 8)
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/*
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* I know this is horrible, but I cannot load the interpreter after
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* the data segment because brk(2) breaks. I have to load it somewhere
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* before. Programs start at 0x08000000 so I load the interpreter far
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* before.
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*/
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#define SVR4_INTERP_ADDR 0x01000000
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struct svr4_args {
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u_long arg_entry; /* progran entry point */
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u_long arg_interp; /* Interpreter load address */
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u_long arg_phaddr; /* program header address */
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u_long arg_phentsize; /* Size of program header */
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u_long arg_phnum; /* Number of program headers */
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};
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static void svr4_setup_args __P((int, struct proc *, struct exec_package *,
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void *));
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static int svr4_check_header __P((Elf32_Ehdr *, int));
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static void svr4_load_psection __P((struct exec_package *, struct vnode *,
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Elf32_Phdr *, u_long *, u_long *, int *));
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static int svr4_set_segment __P((struct exec_package *, u_long, u_long, int));
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static int svr4_read_from __P((struct vnode *, u_long, struct proc *, caddr_t,
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int));
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static int svr4_load_interp __P((struct proc *, char *, struct exec_package *,
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struct svr4_args *, u_long* last));
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#ifdef DEBUG_EXEC_SVR4
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static void
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print_Ehdr(e)
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Elf32_Ehdr *e;
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{
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printf("e_ident %s, ", e->e_ident);
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printf("e_type %d, ", e->e_type);
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printf("e_machine %d, ", e->e_machine);
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printf("e_version %ld, ", e->e_version);
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printf("e_entry %lx, ", e->e_entry);
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printf("e_phoff %lx, ", e->e_phoff);
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printf("e_shoff %lx, ", e->e_shoff);
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printf("e_flags %lx, ", e->e_flags);
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printf("e_ehsize %d, ", e->e_ehsize);
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printf("e_phentsize %d, ", e->e_phentsize);
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printf("e_phnum %d, ", e->e_phnum);
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printf("e_shentsize %d, ", e->e_shentsize);
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printf("e_shnum %d, ", e->e_shnum);
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printf("e_shstrndx %d\n", e->e_shstrndx);
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}
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static void
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print_Phdr(p)
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Elf32_Phdr *p;
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{
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static char *types[] =
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{
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"null", "load", "dynamic", "interp",
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"note", "shlib", "phdr", "entry7"
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};
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printf("p_type %ld [%s], ", p->p_type, types[p->p_type & 7]);
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printf("p_offset %lx, ", p->p_offset);
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printf("p_vaddr %lx, ", p->p_vaddr);
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printf("p_paddr %lx, ", p->p_paddr);
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printf("p_filesz %ld, ", p->p_filesz);
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printf("p_memsz %ld, ", p->p_memsz);
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printf("p_flags %lx, ", p->p_flags);
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printf("p_align %ld\n", p->p_align);
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}
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#endif
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/*
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* svr4_setup_args():
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*
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* Push extra arguments on the stack needed by dynamically linked binaries
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*/
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static void
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svr4_setup_args(cmd, pp, ep, sp)
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int cmd;
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struct proc *pp;
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struct exec_package *ep;
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void *sp;
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{
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AuxInfo *a = sp;
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struct svr4_args* ap = (struct svr4_args *) ep->ep_setup_arg;
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if (cmd == EXEC_SETUP_CLEANUP) {
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if (ap != NULL)
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free((char *) ap, M_TEMP);
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return;
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}
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if (cmd != EXEC_SETUP_ADDARGS)
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return;
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DPRINTF(("phaddr=0x%x, phentsize=%d, phnum=%d, interp=0x%x, entry=0x%x\n",
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ap->arg_phaddr, ap->arg_phentsize, ap->arg_phnum, ap->arg_interp,
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ap->arg_entry));
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a->au_id = AUX_phdr;
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a->au_v = ap->arg_phaddr;
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a++;
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a->au_id = AUX_phent;
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a->au_v = ap->arg_phentsize;
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a++;
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a->au_id = AUX_phnum;
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a->au_v = ap->arg_phnum;
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a++;
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a->au_id = AUX_pagesz;
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a->au_v = SVR4_PAGESIZE;
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a++;
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a->au_id = AUX_base;
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a->au_v = ap->arg_interp;
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a++;
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a->au_id = AUX_flags;
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a->au_v = 0;
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a++;
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a->au_id = AUX_entry;
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a->au_v = ap->arg_entry;
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a++;
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a->au_id = AUX_null;
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a->au_v = 0;
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}
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/*
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* svr4_check_header():
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*
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* Check header for validity; return 0 of ok ENOEXEC if error
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*/
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static int
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svr4_check_header(eh, type)
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Elf32_Ehdr *eh;
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int type;
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{
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if (memcmp(eh->e_ident, Elf32_e_ident, Elf32_e_siz) != 0) {
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DPRINTF(("Not an elf file\n"));
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return ENOEXEC;
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}
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if (eh->e_machine != Elf32_em_386 && eh->e_machine != Elf32_em_486) {
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DPRINTF(("Not an elf/386 or 486 executable\n"));
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return ENOEXEC;
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}
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if (eh->e_type != type) {
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DPRINTF(("Not an elf executable\n"));
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return ENOEXEC;
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}
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return 0;
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}
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/*
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* svr4_load_psection():
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*
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* Load a psection at the appropriate address
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*/
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static void
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svr4_load_psection(epp, vp, ph, addr, size, prot)
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struct exec_package *epp;
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struct vnode *vp;
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Elf32_Phdr *ph;
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u_long *addr;
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u_long *size;
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int *prot;
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{
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u_long uaddr;
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long diff;
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long offset;
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u_long msize;
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/*
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* If the user specified an address, then we load there.
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*/
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if (*addr != ~0) {
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uaddr = *addr + ph->p_align;
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*addr = SVR4_ALIGN(uaddr, ph->p_align);
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uaddr = SVR4_ALIGN(ph->p_vaddr, ph->p_align);
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diff = ph->p_vaddr - uaddr;
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}
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else {
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uaddr = ph->p_vaddr;
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*addr = SVR4_ALIGN(uaddr, ph->p_align);
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diff = uaddr - *addr;
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}
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*prot |= (ph->p_flags & Elf32_pf_r) ? VM_PROT_READ : 0;
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*prot |= (ph->p_flags & Elf32_pf_w) ? VM_PROT_WRITE : 0;
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*prot |= (ph->p_flags & Elf32_pf_x) ? VM_PROT_EXECUTE : 0;
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offset = ph->p_offset - diff;
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*size = ph->p_filesz + diff;
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msize = ph->p_memsz + diff;
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DPRINTF(("Elf Segment@ 0x%x/0x%x sz %d/%d off 0x%x/0x%x[%d] algn 0x%x\n",
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ph->p_vaddr, *addr, *size, msize, ph->p_offset, offset,
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diff, ph->p_align));
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, *size,
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*addr, vp, offset, *prot);
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/*
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* Check if we need to extend the size of the segment
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*/
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{
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u_long rm = round_page(*addr + msize);
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u_long rf = round_page(*addr + *size);
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if (rm != rf) {
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DPRINTF(("zeropad 0x%x-0x%x\n", rf, rm));
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, rm - rf,
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rf, NULLVP, 0, *prot);
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*size = msize;
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}
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}
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}
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/*
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* svr4_set_segment():
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*
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* Decide if the segment is text or data, depending on the protection
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* and set it appropriately
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*/
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static int
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svr4_set_segment(epp, vaddr, size, prot)
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struct exec_package *epp;
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u_long vaddr;
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u_long size;
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int prot;
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{
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/*
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* Kludge: Unfortunately the current implementation of
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* exec package assumes a single text and data segment.
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* In Elf we can have more, but here we limit ourselves
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* to two and hope :-(
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* We also assume that the text is r-x, and data is rwx.
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*/
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switch (prot) {
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case (VM_PROT_READ|VM_PROT_EXECUTE):
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if (epp->ep_tsize != ~0) {
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DPRINTF(("More than one text segment\n"));
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return ENOEXEC;
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}
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epp->ep_taddr = vaddr;
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epp->ep_tsize = size;
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DPRINTF(("Elf Text@ 0x%x, size %d\n", vaddr, size));
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break;
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case (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE):
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if (epp->ep_dsize != ~0) {
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DPRINTF(("More than one data segment\n"));
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return ENOEXEC;
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}
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epp->ep_daddr = vaddr;
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epp->ep_dsize = size;
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DPRINTF(("Elf Data@ 0x%x, size %d\n", vaddr, size));
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break;
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default:
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DPRINTF(("Bad protection 0%o\n", prot));
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return ENOEXEC;
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}
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return 0;
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}
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/*
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* svr4_read_from():
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*
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* Read from vnode into buffer at offset.
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*/
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static int
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svr4_read_from(vp, off, p, buf, size)
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struct vnode *vp;
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u_long off;
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struct proc *p;
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caddr_t buf;
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int size;
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{
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int error;
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int resid;
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DPRINTF(("read from 0x%x to 0x%x size %d\n",
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off, buf, size));
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if ((error = vn_rdwr(UIO_READ, vp, buf, size,
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off, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
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&resid, p)) != 0) {
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DPRINTF(("Bad read error %d\n", error));
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return error;
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}
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/*
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* See if we got all of it
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*/
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if (resid != 0) {
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DPRINTF(("Incomplete read for header ask=%d, rem=%d\n",
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size, resid));
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return error;
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}
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return 0;
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}
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/*
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* svr4_load_interp():
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*
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* Load an interpreter pointed to by path [stolen from coff_load_shlib()]
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*/
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static int
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svr4_load_interp(p, path, epp, ap, last)
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struct proc *p;
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char *path;
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struct exec_package *epp;
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struct svr4_args *ap;
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u_long* last;
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{
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int error, i;
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struct nameidata nd;
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Elf32_Ehdr eh;
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Elf32_Phdr *ph = NULL;
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u_long phsize;
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char *bp = NULL;
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/*
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* Start loading just after the data segment
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*/
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u_long addr = *last;
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DPRINTF(("Loading interpreter %s\n", path));
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if ((error = svr4_emul_find(p, UIO_SYSSPACE, svr4_emul_path, path,
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&bp)) != 0)
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bp = NULL;
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else
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path = bp;
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/*
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* 1. open interp file
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* 2. read filehdr
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* 3. map text, data, and bss out of it using VM_*
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*/
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p);
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/* first get the vnode */
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if ((error = namei(&nd)) != 0) {
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DPRINTF(("Can't find interpreter %s\n", path));
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if (bp != NULL)
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free((char *) bp, M_TEMP);
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return error;
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}
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if ((error = svr4_read_from(nd.ni_vp, 0, p,
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(caddr_t) &eh, sizeof(eh))) != 0)
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goto bad;
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#ifdef DEBUG_EXEC_SVR4
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print_Ehdr(&eh);
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#endif
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if ((error = svr4_check_header(&eh, Elf32_et_dyn)) != 0)
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goto bad;
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phsize = eh.e_phnum * sizeof(Elf32_Phdr);
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ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
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if ((error = svr4_read_from(nd.ni_vp, eh.e_phoff, p,
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(caddr_t) ph, phsize)) != 0)
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goto bad;
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/*
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* Load all the necessary sections
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*/
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for (i = 0; i < eh.e_phnum; i++) {
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u_long size = 0;
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int prot = 0;
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#ifdef DEBUG_EXEC_SVR4
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print_Phdr(&ph[i]);
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#endif
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switch (ph[i].p_type) {
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case Elf32_pt_load:
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svr4_load_psection(epp, nd.ni_vp, &ph[i], &addr, &size,
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&prot);
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/* Assume that the text segment is r-x only */
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if ((prot & PROT_WRITE) == 0) {
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epp->ep_entry = addr + eh.e_entry;
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ap->arg_interp = addr;
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DPRINTF(("Interpreter@ 0x%x\n", addr));
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}
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addr += size;
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break;
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case Elf32_pt_dynamic:
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case Elf32_pt_phdr:
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case Elf32_pt_note:
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break;
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default:
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DPRINTF(("interp: Unexpected program header type %d\n",
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ph[i].p_type));
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break;
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}
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}
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bad:
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if (ph != NULL)
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free((char *) ph, M_TEMP);
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if (bp != NULL)
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free((char *) bp, M_TEMP);
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*last = addr;
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vrele(nd.ni_vp);
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return error;
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}
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/*
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* exec_svr4_elf_makecmds(): Prepare an Elf binary's exec package
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*
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* First, set of 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_svr4_elf_makecmds(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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Elf32_Ehdr *eh = epp->ep_hdr;
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Elf32_Phdr *ph;
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int error;
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int i;
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char interp[MAXPATHLEN];
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u_long pos = 0;
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u_long phsize;
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#ifdef DEBUG_EXEC_SVR4
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print_Ehdr(eh);
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#endif
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|
if (epp->ep_hdrvalid < sizeof(Elf32_Ehdr))
|
|
return ENOEXEC;
|
|
|
|
if (svr4_check_header(eh, Elf32_et_exec))
|
|
return ENOEXEC;
|
|
|
|
/*
|
|
* 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 (epp->ep_vp->v_writecount != 0) {
|
|
#ifdef DIAGNOSTIC
|
|
if (epp->ep_vp->v_flag & VTEXT)
|
|
panic("exec: a VTEXT vnode has writecount != 0\n");
|
|
#endif
|
|
return ETXTBSY;
|
|
}
|
|
|
|
/*
|
|
* Allocate space to hold all the program headers, and read them
|
|
* from the file
|
|
*/
|
|
phsize = eh->e_phnum * sizeof(Elf32_Phdr);
|
|
ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
|
|
|
|
if ((error = svr4_read_from(epp->ep_vp, eh->e_phoff, p,
|
|
(caddr_t) ph, phsize)) != 0)
|
|
goto bad;
|
|
|
|
epp->ep_emul = EMUL_IBCS2_ELF;
|
|
epp->ep_tsize = ~0;
|
|
epp->ep_dsize = ~0;
|
|
|
|
interp[0] = '\0';
|
|
|
|
/*
|
|
* Load all the necessary sections
|
|
*/
|
|
for (i = 0; i < eh->e_phnum; i++) {
|
|
u_long addr = ~0, size = 0;
|
|
int prot = 0;
|
|
Elf32_Phdr *pp = &ph[i];
|
|
#ifdef DEBUG_EXEC_SVR4
|
|
print_Phdr(pp);
|
|
#endif
|
|
|
|
switch (ph[i].p_type) {
|
|
case Elf32_pt_load:
|
|
svr4_load_psection(epp, epp->ep_vp, &ph[i], &addr, &size,
|
|
&prot);
|
|
if ((error = svr4_set_segment(epp, addr, size, prot)) != 0)
|
|
goto bad;
|
|
break;
|
|
|
|
case Elf32_pt_shlib:
|
|
DPRINTF(("COFF Shared libraries not supported (yet)\n"));
|
|
error = ENOEXEC;
|
|
goto bad;
|
|
|
|
case Elf32_pt_interp:
|
|
if (pp->p_filesz >= sizeof(interp)) {
|
|
DPRINTF(("Interpreter path too long %d\n", pp->p_filesz));
|
|
goto bad;
|
|
}
|
|
if ((error = svr4_read_from(epp->ep_vp, pp->p_offset, p,
|
|
(caddr_t) interp, pp->p_filesz)) != 0)
|
|
goto bad;
|
|
break;
|
|
|
|
case Elf32_pt_dynamic:
|
|
case Elf32_pt_phdr:
|
|
case Elf32_pt_note:
|
|
break;
|
|
|
|
default:
|
|
/* Not fatal, we don't need to understand everything :-) */
|
|
DPRINTF(("Unsupported program header type %d\n", pp->p_type));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if we found a dynamically linked binary and arrange to load
|
|
* it's interpreter
|
|
*/
|
|
if (interp[0]) {
|
|
struct svr4_args *ap;
|
|
pos = SVR4_INTERP_ADDR;
|
|
|
|
ap = (struct svr4_args *) malloc(sizeof(struct svr4_args),
|
|
M_TEMP, M_WAITOK);
|
|
if ((error = svr4_load_interp(p, interp, epp, ap, &pos)) != 0) {
|
|
free((char *) ap, M_TEMP);
|
|
goto bad;
|
|
}
|
|
|
|
/* Arrange to load the program headers. */
|
|
pos = SVR4_ALIGN(pos + SVR4_PAGESIZE, SVR4_PAGESIZE);
|
|
DPRINTF(("Program header @0x%x\n", pos));
|
|
ap->arg_phaddr = pos;
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, phsize,
|
|
pos, epp->ep_vp, eh->e_phoff,
|
|
VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
|
|
pos += phsize;
|
|
|
|
ap->arg_phentsize = eh->e_phentsize;
|
|
ap->arg_phnum = eh->e_phnum;
|
|
ap->arg_entry = eh->e_entry;
|
|
|
|
epp->ep_setup = svr4_setup_args;
|
|
epp->ep_setup_arg = ap;
|
|
epp->ep_setup_arglen = SVR4_AUX_ARGSIZ / sizeof(char *);
|
|
|
|
}
|
|
else
|
|
epp->ep_entry = eh->e_entry;
|
|
|
|
DPRINTF(("taddr 0x%x tsize 0x%x daddr 0x%x dsize 0x%x\n",
|
|
epp->ep_taddr, epp->ep_tsize, epp->ep_daddr, epp->ep_dsize));
|
|
|
|
free((char *) ph, M_TEMP);
|
|
|
|
DPRINTF(("Elf entry@ 0x%x\n", epp->ep_entry));
|
|
epp->ep_vp->v_flag |= VTEXT;
|
|
|
|
return exec_aout_setup_stack(p, epp);
|
|
|
|
bad:
|
|
free((char *) ph, M_TEMP);
|
|
return ENOEXEC;
|
|
}
|