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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/imgact.h>
33 #include <sys/imgact_aout.h>
34 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
39 #include <sys/resourcevar.h>
40 #include <sys/signalvar.h>
41 #include <sys/syscall.h>
42 #include <sys/sysent.h>
43 #include <sys/systm.h>
44 #include <sys/vnode.h>
46 #include <machine/frame.h>
47 #include <machine/md_var.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_param.h>
55 static int exec_aout_imgact(struct image_params *imgp);
56 static int aout_fixup(register_t **stack_base, struct image_params *imgp);
58 struct sysentvec aout_sysvec = {
88 aout_fixup(stack_base, imgp)
89 register_t **stack_base;
90 struct image_params *imgp;
93 return (suword(--(*stack_base), imgp->args->argc));
97 exec_aout_imgact(imgp)
98 struct image_params *imgp;
100 const struct exec *a_out = (const struct exec *) imgp->image_header;
101 struct vmspace *vmspace;
105 vm_offset_t text_end, data_end;
106 unsigned long virtual_offset;
107 unsigned long file_offset;
108 unsigned long bss_size;
114 * Linux and *BSD binaries look very much alike,
115 * only the machine id is different:
116 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
117 * NetBSD is in network byte order.. ugh.
119 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
120 ((a_out->a_magic >> 16) & 0xff) != 0 &&
121 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
125 * Set file/virtual offset based on a.out variant.
126 * We do two cases: host byte order and network byte order
127 * (for NetBSD compatibility)
129 switch ((int)(a_out->a_magic & 0xffff)) {
133 file_offset = PAGE_SIZE;
135 /* Bill's "screwball mode" */
140 virtual_offset = PAGE_SIZE;
142 /* Pass PS_STRINGS for BSD/OS binaries only. */
143 if (N_GETMID(*a_out) == MID_ZERO)
144 imgp->ps_strings = aout_sysvec.sv_psstrings;
147 /* NetBSD compatibility */
148 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
151 virtual_offset = PAGE_SIZE;
159 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
162 * Check various fields in header for validity/bounds.
164 if (/* entry point must lay with text region */
165 a_out->a_entry < virtual_offset ||
166 a_out->a_entry >= virtual_offset + a_out->a_text ||
168 /* text and data size must each be page rounded */
169 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
172 /* text + data can't exceed file size */
173 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
177 * text/data/bss must not exceed limits
179 PROC_LOCK(imgp->proc);
180 if (/* text can't exceed maximum text size */
181 a_out->a_text > maxtsiz ||
183 /* data + bss can't exceed rlimit */
184 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
185 PROC_UNLOCK(imgp->proc);
188 PROC_UNLOCK(imgp->proc);
191 * Destroy old process VM and create a new one (with a new stack)
193 exec_new_vmspace(imgp, &aout_sysvec);
196 * The vm space can be changed by exec_new_vmspace
198 vmspace = imgp->proc->p_vmspace;
201 object = imgp->object;
202 map = &vmspace->vm_map;
204 vm_object_reference(object);
206 text_end = virtual_offset + a_out->a_text;
207 error = vm_map_insert(map, object,
209 virtual_offset, text_end,
210 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
211 MAP_COPY_ON_WRITE | MAP_PREFAULT);
216 data_end = text_end + a_out->a_data;
218 vm_object_reference(object);
219 error = vm_map_insert(map, object,
220 file_offset + a_out->a_text,
222 VM_PROT_ALL, VM_PROT_ALL,
223 MAP_COPY_ON_WRITE | MAP_PREFAULT);
231 error = vm_map_insert(map, NULL, 0,
232 data_end, data_end + bss_size,
233 VM_PROT_ALL, VM_PROT_ALL, 0);
241 /* Fill in process VM information */
242 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
243 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
244 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
245 vmspace->vm_daddr = (caddr_t) (uintptr_t)
246 (virtual_offset + a_out->a_text);
248 /* Fill in image_params */
249 imgp->interpreted = 0;
250 imgp->entry_addr = a_out->a_entry;
252 imgp->proc->p_sysent = &aout_sysvec;
258 * Tell kern_execve.c about it, with a little help from the linker.
260 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
261 EXEC_SET(aout, aout_execsw);