2 * Copyright (c) 1994-1996 Søren Schmidt
5 * Based heavily on /sys/kern/imgact_aout.c which is:
6 * Copyright (c) 1993, David Greenman
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer
13 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <sys/imgact.h>
39 #include <sys/imgact_aout.h>
40 #include <sys/kernel.h>
43 #include <sys/mutex.h>
45 #include <sys/resourcevar.h>
46 #include <sys/vnode.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_param.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_extern.h>
55 #include <i386/linux/linux.h>
57 static int exec_linux_imgact(struct image_params *iparams);
60 exec_linux_imgact(struct image_params *imgp)
62 const struct exec *a_out = (const struct exec *) imgp->image_header;
63 struct vmspace *vmspace;
65 unsigned long virtual_offset, file_offset;
67 unsigned long bss_size;
70 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
74 * Set file/virtual offset based on a.out variant.
76 switch ((int)(a_out->a_magic & 0xffff)) {
82 virtual_offset = 4096;
88 bss_size = round_page(a_out->a_bss);
90 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
91 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
95 * Check various fields in header for validity/bounds.
97 if (a_out->a_entry < virtual_offset ||
98 a_out->a_entry >= virtual_offset + a_out->a_text ||
99 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
102 /* text + data can't exceed file size */
103 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
106 * text/data/bss must not exceed limits
108 PROC_LOCK(imgp->proc);
109 if (a_out->a_text > maxtsiz ||
110 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
111 PROC_UNLOCK(imgp->proc);
114 PROC_UNLOCK(imgp->proc);
116 VOP_UNLOCK(imgp->vp, 0);
119 * Destroy old process VM and create a new one (with a new stack)
121 error = exec_new_vmspace(imgp, &linux_sysvec);
124 vmspace = imgp->proc->p_vmspace;
127 * Check if file_offset page aligned,.
128 * Currently we cannot handle misaligned 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, OBJT_VNODE,
148 imgp->vp, trunc_page(file_offset));
152 error = copyout((void *)(uintptr_t)(buffer + file_offset),
153 (void *)vmaddr, 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,
186 imgp->vp, file_offset);
191 printf("imgact: startaddr=%08lx, length=%08lx\n",
192 (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data);
195 * allow read/write of data
197 error = vm_map_protect(&vmspace->vm_map,
198 vmaddr + a_out->a_text,
199 vmaddr + a_out->a_text + a_out->a_data,
206 * Allocate anon demand-zeroed area for uninitialized data
209 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
210 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
211 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
215 printf("imgact: bssaddr=%08lx, length=%08lx\n",
216 (u_long)vmaddr, bss_size);
220 /* Indicate that this file should not be modified */
221 mp_fixme("Unlocked v_flag access");
222 imgp->vp->v_vflag |= VV_TEXT;
224 /* Fill in process VM information */
225 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
226 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
227 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
228 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
229 (virtual_offset + a_out->a_text);
231 /* Fill in image_params */
232 imgp->interpreted = 0;
233 imgp->entry_addr = a_out->a_entry;
235 imgp->proc->p_sysent = &linux_sysvec;
238 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
243 * Tell kern_execve.c about it, with a little help from the linker.
245 static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
246 EXEC_SET(linuxaout, linux_execsw);