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 $
29 #include <sys/param.h>
30 #include <sys/resourcevar.h>
32 #include <sys/fcntl.h>
33 #include <sys/imgact.h>
34 #include <sys/imgact_aout.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/systm.h>
39 #include <sys/pioctl.h>
40 #include <sys/signalvar.h>
42 #include <sys/sysent.h>
43 #include <sys/syscall.h>
44 #include <sys/vnode.h>
45 #include <machine/md_var.h>
48 #include <vm/vm_param.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
54 static int exec_aout_imgact (struct image_params *imgp);
56 struct sysentvec aout_sysvec = {
75 exec_aout_imgact(struct image_params *imgp)
77 const struct exec *a_out = (const struct exec *) imgp->image_header;
78 struct vmspace *vmspace;
83 vm_offset_t text_end, data_end;
84 unsigned long virtual_offset;
85 unsigned long file_offset;
86 unsigned long bss_size;
90 * Linux and *BSD binaries look very much alike,
91 * only the machine id is different:
92 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
93 * NetBSD is in network byte order.. ugh.
95 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
96 ((a_out->a_magic >> 16) & 0xff) != 0 &&
97 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
101 * Set file/virtual offset based on a.out variant.
102 * We do two cases: host byte order and network byte order
103 * (for NetBSD compatibility)
105 switch ((int)(a_out->a_magic & 0xffff)) {
109 file_offset = PAGE_SIZE;
111 /* Bill's "screwball mode" */
116 virtual_offset = PAGE_SIZE;
118 /* Pass PS_STRINGS for BSD/OS binaries only. */
119 if (N_GETMID(*a_out) == MID_ZERO)
120 imgp->ps_strings = PS_STRINGS;
123 /* NetBSD compatibility */
124 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
127 virtual_offset = PAGE_SIZE;
135 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
138 * Check various fields in header for validity/bounds.
140 if (/* entry point must lay with text region */
141 a_out->a_entry < virtual_offset ||
142 a_out->a_entry >= virtual_offset + a_out->a_text ||
144 /* text and data size must each be page rounded */
145 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
148 /* text + data can't exceed file size */
149 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
153 * text/data/bss must not exceed limits
155 if (/* text can't exceed maximum text size */
156 a_out->a_text > maxtsiz ||
158 /* data + bss can't exceed rlimit */
159 a_out->a_data + bss_size >
160 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
164 * Destroy old process VM and create a new one (with a new stack)
166 exec_new_vmspace(imgp, NULL);
169 * The vm space can be changed by exec_new_vmspace
171 vmspace = imgp->proc->p_vmspace;
174 map = &vmspace->vm_map;
175 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
177 object = vp->v_object;
178 vm_object_hold(object);
179 vm_object_reference_locked(object);
181 text_end = virtual_offset + a_out->a_text;
182 error = vm_map_insert(map, &count, object, NULL,
184 virtual_offset, text_end,
187 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
188 MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_PREFAULT_RELOCK);
191 vm_object_deallocate_locked(object);
192 vm_object_drop(object);
194 vm_map_entry_release(count);
198 data_end = text_end + a_out->a_data;
200 vm_object_reference_locked(object);
201 error = vm_map_insert(map, &count, object, NULL,
202 file_offset + a_out->a_text, NULL,
206 VM_PROT_ALL, VM_PROT_ALL,
207 MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_PREFAULT_RELOCK);
209 vm_object_deallocate_locked(object);
210 vm_object_drop(object);
212 vm_map_entry_release(count);
216 vm_object_drop(object);
219 error = vm_map_insert(map, &count, NULL, NULL,
221 data_end, data_end + bss_size,
224 VM_PROT_ALL, VM_PROT_ALL,
228 vm_map_entry_release(count);
233 vm_map_entry_release(count);
235 /* Fill in process VM information */
236 vmspace->vm_tsize = a_out->a_text; /* in bytes */
237 vmspace->vm_dsize = a_out->a_data + bss_size; /* in bytes */
238 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
239 vmspace->vm_daddr = (caddr_t) (uintptr_t)
240 (virtual_offset + a_out->a_text);
242 /* Fill in image_params */
243 imgp->interpreted = 0;
244 imgp->entry_addr = a_out->a_entry;
246 imgp->proc->p_sysent = &aout_sysvec;
248 /* Indicate that this file should not be modified */
249 vsetflags(imgp->vp, VTEXT);
255 * Tell kern_execve.c about it, with a little help from the linker.
257 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
258 EXEC_SET(aout, aout_execsw);