2 * Copyright (c) 1993, David Greenman
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/kern/imgact_aout.c,v 1.59.2.5 2001/11/03 01:41:08 ps Exp $
27 * $DragonFly: src/sys/kern/imgact_aout.c,v 1.14 2007/02/01 10:33:25 corecode Exp $
30 #include <sys/param.h>
31 #include <sys/resourcevar.h>
33 #include <sys/fcntl.h>
34 #include <sys/imgact.h>
35 #include <sys/imgact_aout.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/systm.h>
40 #include <sys/namei.h>
41 #include <sys/pioctl.h>
42 #include <sys/signalvar.h>
44 #include <sys/sysent.h>
45 #include <sys/syscall.h>
46 #include <sys/vnode.h>
47 #include <machine/md_var.h>
50 #include <vm/vm_param.h>
53 #include <vm/vm_map.h>
54 #include <vm/vm_object.h>
57 static int exec_aout_imgact (struct image_params *imgp);
59 struct sysentvec aout_sysvec = {
80 exec_aout_imgact(struct image_params *imgp)
82 const struct exec *a_out = (const struct exec *) imgp->image_header;
83 struct vmspace *vmspace;
88 vm_offset_t text_end, data_end;
89 unsigned long virtual_offset;
90 unsigned long file_offset;
91 unsigned long bss_size;
95 * Linux and *BSD binaries look very much alike,
96 * only the machine id is different:
97 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
98 * NetBSD is in network byte order.. ugh.
100 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
101 ((a_out->a_magic >> 16) & 0xff) != 0 &&
102 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
106 * Set file/virtual offset based on a.out variant.
107 * We do two cases: host byte order and network byte order
108 * (for NetBSD compatibility)
110 switch ((int)(a_out->a_magic & 0xffff)) {
114 file_offset = PAGE_SIZE;
116 /* Bill's "screwball mode" */
121 virtual_offset = PAGE_SIZE;
123 /* Pass PS_STRINGS for BSD/OS binaries only. */
124 if (N_GETMID(*a_out) == MID_ZERO)
125 imgp->ps_strings = PS_STRINGS;
128 /* NetBSD compatibility */
129 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
132 virtual_offset = PAGE_SIZE;
140 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
143 * Check various fields in header for validity/bounds.
145 if (/* entry point must lay with text region */
146 a_out->a_entry < virtual_offset ||
147 a_out->a_entry >= virtual_offset + a_out->a_text ||
149 /* text and data size must each be page rounded */
150 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
153 /* text + data can't exceed file size */
154 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
158 * text/data/bss must not exceed limits
160 if (/* text can't exceed maximum text size */
161 a_out->a_text > maxtsiz ||
163 /* data + bss can't exceed rlimit */
164 a_out->a_data + bss_size >
165 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
169 * Destroy old process VM and create a new one (with a new stack)
171 exec_new_vmspace(imgp, NULL);
174 * The vm space can be changed by exec_new_vmspace
176 vmspace = imgp->proc->p_vmspace;
179 map = &vmspace->vm_map;
180 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
182 object = vp->v_object;
183 vm_object_reference(object);
185 text_end = virtual_offset + a_out->a_text;
186 error = vm_map_insert(map, &count, object,
188 virtual_offset, text_end,
190 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
191 MAP_COPY_ON_WRITE | MAP_PREFAULT);
194 vm_map_entry_release(count);
197 data_end = text_end + a_out->a_data;
199 vm_object_reference(object);
200 error = vm_map_insert(map, &count, object,
201 file_offset + a_out->a_text,
204 VM_PROT_ALL, VM_PROT_ALL,
205 MAP_COPY_ON_WRITE | MAP_PREFAULT);
208 vm_map_entry_release(count);
214 error = vm_map_insert(map, &count, NULL, 0,
215 data_end, data_end + bss_size,
217 VM_PROT_ALL, VM_PROT_ALL,
221 vm_map_entry_release(count);
226 vm_map_entry_release(count);
228 /* Fill in process VM information */
229 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
230 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
231 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
232 vmspace->vm_daddr = (caddr_t) (uintptr_t)
233 (virtual_offset + a_out->a_text);
235 /* Fill in image_params */
236 imgp->interpreted = 0;
237 imgp->entry_addr = a_out->a_entry;
239 imgp->proc->p_sysent = &aout_sysvec;
241 /* Indicate that this file should not be modified */
242 imgp->vp->v_flag |= VTEXT;
248 * Tell kern_execve.c about it, with a little help from the linker.
250 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
251 EXEC_SET(aout, aout_execsw);