2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994-1996 Søren Schmidt
6 * Based heavily on /sys/kern/imgact_aout.c which is:
7 * Copyright (c) 1993, David Greenman
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in this position and unchanged.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/imgact.h>
40 #include <sys/imgact_aout.h>
41 #include <sys/kernel.h>
44 #include <sys/mutex.h>
46 #include <sys/resourcevar.h>
47 #include <sys/vnode.h>
50 #include <vm/vm_kern.h>
51 #include <vm/vm_param.h>
53 #include <vm/vm_map.h>
54 #include <vm/vm_extern.h>
56 #include <compat/svr4/svr4.h>
58 static int exec_svr4_imgact(struct image_params *iparams);
61 exec_svr4_imgact(imgp)
62 struct image_params *imgp;
64 const struct exec *a_out = (const struct exec *) imgp->image_header;
65 struct vmspace *vmspace;
67 unsigned long virtual_offset, file_offset;
69 unsigned long bss_size;
71 struct thread *td = curthread;
73 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
77 * Set file/virtual offset based on a.out variant.
79 switch ((int)(a_out->a_magic & 0xffff)) {
85 virtual_offset = 4096;
91 bss_size = round_page(a_out->a_bss);
93 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
97 * Check various fields in header for validity/bounds.
99 if (a_out->a_entry < virtual_offset ||
100 a_out->a_entry >= virtual_offset + a_out->a_text ||
101 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
104 /* text + data can't exceed file size */
105 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
108 * text/data/bss must not exceed limits
110 PROC_LOCK(imgp->proc);
111 if (a_out->a_text > maxtsiz ||
112 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
113 PROC_UNLOCK(imgp->proc);
116 PROC_UNLOCK(imgp->proc);
118 VOP_UNLOCK(imgp->vp, 0, td);
121 * Destroy old process VM and create a new one (with a new stack)
123 exec_new_vmspace(imgp, &svr4_sysvec);
124 vmspace = imgp->proc->p_vmspace;
127 * Check if file_offset page aligned,.
128 * Currently we cannot handle misalinged file offsets,
129 * and so we read in the entire image (what a waste).
131 if (file_offset & PAGE_MASK) {
133 printf("imgact: Non page aligned binary %lu\n", file_offset);
136 * Map text+data+bss read/write/execute
138 vmaddr = virtual_offset;
139 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
140 a_out->a_text + a_out->a_data + bss_size, FALSE,
141 VM_PROT_ALL, VM_PROT_ALL, 0);
145 error = vm_mmap(kernel_map, &buffer,
146 round_page(a_out->a_text + a_out->a_data + file_offset),
147 VM_PROT_READ, VM_PROT_READ, 0,
148 OBJT_VNODE, imgp->vp, trunc_page(file_offset));
152 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
153 a_out->a_text + a_out->a_data);
155 vm_map_remove(kernel_map, buffer,
156 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
162 * remove write enable on the 'text' part
164 error = vm_map_protect(&vmspace->vm_map,
166 vmaddr + a_out->a_text,
167 VM_PROT_EXECUTE|VM_PROT_READ,
174 printf("imgact: Page aligned binary %lu\n", file_offset);
177 * Map text+data read/execute
179 vmaddr = virtual_offset;
180 error = vm_mmap(&vmspace->vm_map, &vmaddr,
181 a_out->a_text + a_out->a_data,
182 VM_PROT_READ | VM_PROT_EXECUTE,
184 MAP_PRIVATE | MAP_FIXED,
185 OBJT_VNODE, imgp->vp, file_offset);
190 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
191 (u_long)a_out->a_text + a_out->a_data);
194 * allow read/write of data
196 error = vm_map_protect(&vmspace->vm_map,
197 vmaddr + a_out->a_text,
198 vmaddr + a_out->a_text + a_out->a_data,
205 * Allocate anon demand-zeroed area for uninitialized data
208 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
209 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
210 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
214 printf("imgact: bssaddr=%08lx, length=%08lx\n",
215 (u_long)vmaddr, bss_size);
220 /* Fill in process VM information */
221 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
222 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
223 vmspace->vm_taddr = (caddr_t)virtual_offset;
224 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
226 /* Fill in image_params */
227 imgp->interpreted = 0;
228 imgp->entry_addr = a_out->a_entry;
230 imgp->proc->p_sysent = &svr4_sysvec;
232 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
237 * Tell kern_execve.c about it, with a little help from the linker.
239 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
240 EXEC_SET(execsw_set, svr4_execsw);