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
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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
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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/namei.h>
38 #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 <sys/systm.h>
46 #include <machine/md_var.h>
49 #include <vm/vm_param.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_object.h>
56 static int exec_aout_imgact __P((struct image_params *imgp));
58 struct sysentvec aout_sysvec = {
79 exec_aout_imgact(imgp)
80 struct image_params *imgp;
82 const struct exec *a_out = (const struct exec *) imgp->image_header;
83 struct vmspace *vmspace;
87 vm_offset_t text_end, data_end;
88 unsigned long virtual_offset;
89 unsigned long file_offset;
90 unsigned long bss_size;
94 * Linux and *BSD binaries look very much alike,
95 * only the machine id is different:
96 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
97 * NetBSD is in network byte order.. ugh.
99 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
100 ((a_out->a_magic >> 16) & 0xff) != 0 &&
101 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
105 * Set file/virtual offset based on a.out variant.
106 * We do two cases: host byte order and network byte order
107 * (for NetBSD compatibility)
109 switch ((int)(a_out->a_magic & 0xffff)) {
113 file_offset = PAGE_SIZE;
115 /* Bill's "screwball mode" */
120 virtual_offset = PAGE_SIZE;
122 /* Pass PS_STRINGS for BSD/OS binaries only. */
123 if (N_GETMID(*a_out) == MID_ZERO)
124 imgp->ps_strings = PS_STRINGS;
127 /* NetBSD compatibility */
128 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
131 virtual_offset = PAGE_SIZE;
139 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
142 * Check various fields in header for validity/bounds.
144 if (/* entry point must lay with text region */
145 a_out->a_entry < virtual_offset ||
146 a_out->a_entry >= virtual_offset + a_out->a_text ||
148 /* text and data size must each be page rounded */
149 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
152 /* text + data can't exceed file size */
153 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
157 * text/data/bss must not exceed limits
159 if (/* text can't exceed maximum text size */
160 a_out->a_text > maxtsiz ||
162 /* data + bss can't exceed rlimit */
163 a_out->a_data + bss_size >
164 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
167 /* copy in arguments and/or environment from old process */
168 error = exec_extract_strings(imgp);
173 * Destroy old process VM and create a new one (with a new stack)
175 exec_new_vmspace(imgp);
178 * The vm space can be changed by exec_new_vmspace
180 vmspace = imgp->proc->p_vmspace;
183 map = &vmspace->vm_map;
185 VOP_GETVOBJECT(vp, &object);
186 vm_object_reference(object);
188 text_end = virtual_offset + a_out->a_text;
189 error = vm_map_insert(map, object,
191 virtual_offset, text_end,
192 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
193 MAP_COPY_ON_WRITE | MAP_PREFAULT);
198 data_end = text_end + a_out->a_data;
200 vm_object_reference(object);
201 error = vm_map_insert(map, object,
202 file_offset + a_out->a_text,
204 VM_PROT_ALL, VM_PROT_ALL,
205 MAP_COPY_ON_WRITE | MAP_PREFAULT);
213 error = vm_map_insert(map, NULL, 0,
214 data_end, data_end + bss_size,
215 VM_PROT_ALL, VM_PROT_ALL, 0);
223 /* Fill in process VM information */
224 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
225 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
226 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
227 vmspace->vm_daddr = (caddr_t) (uintptr_t)
228 (virtual_offset + a_out->a_text);
230 /* Fill in image_params */
231 imgp->interpreted = 0;
232 imgp->entry_addr = a_out->a_entry;
234 imgp->proc->p_sysent = &aout_sysvec;
236 /* Indicate that this file should not be modified */
237 imgp->vp->v_flag |= VTEXT;
243 * Dump core, into a file named as described in the comments for
244 * expand_name(), unless the process was setuid/setgid.
247 aout_coredump(p, vp, limit)
248 register struct proc *p;
249 register struct vnode *vp;
252 register struct ucred *cred = p->p_ucred;
253 register struct vmspace *vm = p->p_vmspace;
256 if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= limit)
258 bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc));
259 fill_eproc(p, &p->p_addr->u_kproc.kp_eproc);
260 error = cpu_coredump(p, vp, cred);
262 error = vn_rdwr_inchunks(UIO_WRITE, vp, vm->vm_daddr,
263 (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE,
264 IO_UNIT | IO_DIRECT, cred, (int *) NULL, p);
266 error = vn_rdwr_inchunks(UIO_WRITE, vp,
267 (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)),
268 round_page(ctob(vm->vm_ssize)),
269 (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE,
270 IO_UNIT | IO_DIRECT, cred, (int *) NULL, p);
275 * Tell kern_execve.c about it, with a little help from the linker.
277 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
278 EXEC_SET(aout, aout_execsw);