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 withough 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.
32 * $FreeBSD: src/sys/svr4/imgact_svr4.c,v 1.8.2.1 2001/11/03 01:41:09 ps Exp $
33 * $DragonFly: src/sys/emulation/svr4/Attic/imgact_svr4.c,v 1.2 2003/06/17 04:28:57 dillon Exp $
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/resourcevar.h>
41 #include <sys/imgact.h>
42 #include <sys/imgact_aout.h>
43 #include <sys/kernel.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 <svr4/svr4.h>
57 static int exec_svr4_imgact __P((struct image_params *iparams));
60 exec_svr4_imgact(imgp)
61 struct image_params *imgp;
63 const struct exec *a_out = (const struct exec *) imgp->image_header;
64 struct vmspace *vmspace;
66 unsigned long virtual_offset, file_offset;
68 unsigned long bss_size;
71 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
75 * Set file/virtual offset based on a.out variant.
77 switch ((int)(a_out->a_magic & 0xffff)) {
83 virtual_offset = 4096;
89 bss_size = round_page(a_out->a_bss);
91 printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, 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 if (a_out->a_text > maxtsiz ||
109 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
112 /* copy in arguments and/or environment from old process */
113 error = exec_extract_strings(imgp);
118 * Destroy old process VM and create a new one (with a new stack)
120 exec_new_vmspace(imgp);
121 vmspace = imgp->proc->p_vmspace;
124 * Check if file_offset page aligned,.
125 * Currently we cannot handle misalinged file offsets,
126 * and so we read in the entire image (what a waste).
128 if (file_offset & PAGE_MASK) {
130 printf("imgact: Non page aligned binary %d\n", file_offset);
133 * Map text+data+bss read/write/execute
135 vmaddr = virtual_offset;
136 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
137 a_out->a_text + a_out->a_data + bss_size, FALSE,
138 VM_PROT_ALL, VM_PROT_ALL, 0);
142 error = vm_mmap(kernel_map, &buffer,
143 round_page(a_out->a_text + a_out->a_data + file_offset),
144 VM_PROT_READ, VM_PROT_READ, 0,
145 (caddr_t) imgp->vp, trunc_page(file_offset));
149 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
150 a_out->a_text + a_out->a_data);
152 vm_map_remove(kernel_map, buffer,
153 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
159 * remove write enable on the 'text' part
161 error = vm_map_protect(&vmspace->vm_map,
163 vmaddr + a_out->a_text,
164 VM_PROT_EXECUTE|VM_PROT_READ,
171 printf("imgact: Page aligned binary %d\n", file_offset);
174 * Map text+data read/execute
176 vmaddr = virtual_offset;
177 error = vm_mmap(&vmspace->vm_map, &vmaddr,
178 a_out->a_text + a_out->a_data,
179 VM_PROT_READ | VM_PROT_EXECUTE,
181 MAP_PRIVATE | MAP_FIXED,
182 (caddr_t)imgp->vp, file_offset);
187 printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data);
190 * allow read/write of data
192 error = vm_map_protect(&vmspace->vm_map,
193 vmaddr + a_out->a_text,
194 vmaddr + a_out->a_text + a_out->a_data,
201 * Allocate anon demand-zeroed area for uninitialized data
204 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
205 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
206 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
210 printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size);
214 /* Indicate that this file should not be modified */
215 imgp->vp->v_flag |= VTEXT;
217 /* Fill in process VM information */
218 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
219 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
220 vmspace->vm_taddr = (caddr_t)virtual_offset;
221 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
223 /* Fill in image_params */
224 imgp->interpreted = 0;
225 imgp->entry_addr = a_out->a_entry;
227 imgp->proc->p_sysent = &svr4_sysvec;
232 * Tell kern_execve.c about it, with a little help from the linker.
234 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
235 EXEC_SET(execsw_set, svr4_execsw);