2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1993, David Greenman
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
34 #include <sys/imgact.h>
35 #include <sys/imgact_aout.h>
36 #include <sys/kernel.h>
37 #include <sys/limits.h>
39 #include <sys/malloc.h>
40 #include <sys/mutex.h>
42 #include <sys/racct.h>
43 #include <sys/resourcevar.h>
44 #include <sys/signalvar.h>
45 #include <sys/syscall.h>
46 #include <sys/sysent.h>
47 #include <sys/systm.h>
48 #include <sys/vnode.h>
50 #include <machine/frame.h>
51 #include <machine/md_var.h>
55 #include <vm/vm_map.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_param.h>
60 #include <compat/freebsd32/freebsd32_signal.h>
61 #include <compat/freebsd32/freebsd32_util.h>
62 #include <compat/freebsd32/freebsd32_proto.h>
63 #include <compat/freebsd32/freebsd32_syscall.h>
64 #include <compat/ia32/ia32_signal.h>
67 static int exec_aout_imgact(struct image_params *imgp);
68 static int aout_fixup(uintptr_t *stack_base, struct image_params *imgp);
70 #define AOUT32_USRSTACK 0xbfc00000
74 #define AOUT32_PS_STRINGS (AOUT32_USRSTACK - sizeof(struct ps_strings))
76 struct sysentvec aout_sysvec = {
77 .sv_size = SYS_MAXSYSCALL,
79 .sv_fixup = aout_fixup,
80 .sv_sendsig = sendsig,
81 .sv_sigcode = sigcode,
82 .sv_szsigcode = &szsigcode,
83 .sv_name = "FreeBSD a.out",
85 .sv_imgact_try = NULL,
86 .sv_minsigstksz = MINSIGSTKSZ,
87 .sv_minuser = VM_MIN_ADDRESS,
88 .sv_maxuser = AOUT32_USRSTACK,
89 .sv_usrstack = AOUT32_USRSTACK,
90 .sv_psstrings = AOUT32_PS_STRINGS,
91 .sv_psstringssz = sizeof(struct ps_strings),
92 .sv_stackprot = VM_PROT_ALL,
93 .sv_copyout_strings = exec_copyout_strings,
94 .sv_setregs = exec_setregs,
97 .sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32,
98 .sv_set_syscall_retval = cpu_set_syscall_retval,
99 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
100 .sv_syscallnames = syscallnames,
101 .sv_schedtail = NULL,
102 .sv_thread_detach = NULL,
104 .sv_onexec_old = exec_onexec_old,
105 .sv_onexit = exit_onexit,
106 .sv_set_fork_retval = x86_set_fork_retval,
109 #elif defined(__amd64__)
111 #include "vdso_ia32_offsets.h"
113 extern const char _binary_elf_vdso32_so_1_start[];
114 extern const char _binary_elf_vdso32_so_1_end[];
115 extern char _binary_elf_vdso32_so_1_size;
117 #define AOUT32_PS_STRINGS \
118 (AOUT32_USRSTACK - sizeof(struct freebsd32_ps_strings))
119 #define AOUT32_MINUSER FREEBSD32_MINUSER
121 extern const char *freebsd32_syscallnames[];
122 extern u_long ia32_maxssiz;
124 static int aout_szsigcode;
126 struct sysentvec aout_sysvec = {
127 .sv_size = FREEBSD32_SYS_MAXSYSCALL,
128 .sv_table = freebsd32_sysent,
129 .sv_fixup = aout_fixup,
130 .sv_sendsig = ia32_sendsig,
131 .sv_sigcode = _binary_elf_vdso32_so_1_start,
132 .sv_szsigcode = &aout_szsigcode,
133 .sv_name = "FreeBSD a.out",
135 .sv_imgact_try = NULL,
136 .sv_minsigstksz = MINSIGSTKSZ,
137 .sv_minuser = AOUT32_MINUSER,
138 .sv_maxuser = AOUT32_USRSTACK,
139 .sv_usrstack = AOUT32_USRSTACK,
140 .sv_psstrings = AOUT32_PS_STRINGS,
141 .sv_psstringssz = sizeof(struct freebsd32_ps_strings),
142 .sv_stackprot = VM_PROT_ALL,
143 .sv_copyout_strings = freebsd32_copyout_strings,
144 .sv_setregs = ia32_setregs,
145 .sv_fixlimit = ia32_fixlimit,
146 .sv_maxssiz = &ia32_maxssiz,
147 .sv_flags = SV_ABI_FREEBSD | SV_AOUT | SV_IA32 | SV_ILP32,
148 .sv_set_syscall_retval = ia32_set_syscall_retval,
149 .sv_fetch_syscall_args = ia32_fetch_syscall_args,
150 .sv_syscallnames = freebsd32_syscallnames,
151 .sv_onexec_old = exec_onexec_old,
152 .sv_onexit = exit_onexit,
153 .sv_set_fork_retval = x86_set_fork_retval,
157 aout_sysent(void *arg __unused)
159 aout_szsigcode = (int)(uintptr_t)&_binary_elf_vdso32_so_1_size;
161 SYSINIT(aout_sysent, SI_SUB_EXEC, SI_ORDER_ANY, aout_sysent, NULL);
163 #error "Only ia32 arch is supported"
167 aout_fixup(uintptr_t *stack_base, struct image_params *imgp)
170 *stack_base -= sizeof(uint32_t);
171 if (suword32((void *)*stack_base, imgp->args->argc) != 0)
177 exec_aout_imgact(struct image_params *imgp)
179 const struct exec *a_out;
180 struct vmspace *vmspace;
183 vm_offset_t text_end, data_end;
184 unsigned long virtual_offset;
185 unsigned long file_offset;
186 unsigned long bss_size;
189 a_out = (const struct exec *)imgp->image_header;
192 * Linux and *BSD binaries look very much alike,
193 * only the machine id is different:
194 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
195 * NetBSD is in network byte order.. ugh.
197 if (((a_out->a_midmag >> 16) & 0xff) != 0x86 &&
198 ((a_out->a_midmag >> 16) & 0xff) != 0 &&
199 ((((int)ntohl(a_out->a_midmag)) >> 16) & 0xff) != 0x86)
203 * Set file/virtual offset based on a.out variant.
204 * We do two cases: host byte order and network byte order
205 * (for NetBSD compatibility)
207 switch ((int)(a_out->a_midmag & 0xffff)) {
211 file_offset = PAGE_SIZE;
213 /* Bill's "screwball mode" */
218 virtual_offset = PAGE_SIZE;
220 /* Pass PS_STRINGS for BSD/OS binaries only. */
221 if (N_GETMID(*a_out) == MID_ZERO)
222 imgp->ps_strings = (void *)aout_sysvec.sv_psstrings;
225 /* NetBSD compatibility */
226 switch ((int)(ntohl(a_out->a_midmag) & 0xffff)) {
229 virtual_offset = PAGE_SIZE;
237 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
240 * Check various fields in header for validity/bounds.
242 if (/* entry point must lay with text region */
243 a_out->a_entry < virtual_offset ||
244 a_out->a_entry >= virtual_offset + a_out->a_text ||
246 /* text and data size must each be page rounded */
247 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK
252 virtual_offset + a_out->a_text + a_out->a_data + bss_size > UINT_MAX
257 /* text + data can't exceed file size */
258 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
262 * text/data/bss must not exceed limits
264 PROC_LOCK(imgp->proc);
265 if (/* text can't exceed maximum text size */
266 a_out->a_text > maxtsiz ||
268 /* data + bss can't exceed rlimit */
269 a_out->a_data + bss_size > lim_cur_proc(imgp->proc, RLIMIT_DATA) ||
270 racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {
271 PROC_UNLOCK(imgp->proc);
274 PROC_UNLOCK(imgp->proc);
277 * Avoid a possible deadlock if the current address space is destroyed
278 * and that address space maps the locked vnode. In the common case,
279 * the locked vnode's v_usecount is decremented but remains greater
280 * than zero. Consequently, the vnode lock is not needed by vrele().
281 * However, in cases where the vnode lock is external, such as nullfs,
282 * v_usecount may become zero.
284 VOP_UNLOCK(imgp->vp);
287 * Destroy old process VM and create a new one (with a new stack)
289 error = exec_new_vmspace(imgp, &aout_sysvec);
291 vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
296 * The vm space can be changed by exec_new_vmspace
298 vmspace = imgp->proc->p_vmspace;
300 object = imgp->object;
301 map = &vmspace->vm_map;
303 vm_object_reference(object);
305 text_end = virtual_offset + a_out->a_text;
306 error = vm_map_insert(map, object,
308 virtual_offset, text_end,
309 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
310 MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_VN_EXEC);
313 vm_object_deallocate(object);
316 VOP_SET_TEXT_CHECKED(imgp->vp);
317 data_end = text_end + a_out->a_data;
319 vm_object_reference(object);
320 error = vm_map_insert(map, object,
321 file_offset + a_out->a_text,
323 VM_PROT_ALL, VM_PROT_ALL,
324 MAP_COPY_ON_WRITE | MAP_PREFAULT | MAP_VN_EXEC);
327 vm_object_deallocate(object);
330 VOP_SET_TEXT_CHECKED(imgp->vp);
334 error = vm_map_insert(map, NULL, 0,
335 data_end, data_end + bss_size,
336 VM_PROT_ALL, VM_PROT_ALL, 0);
344 /* Fill in process VM information */
345 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
346 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
347 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
348 vmspace->vm_daddr = (caddr_t) (uintptr_t)
349 (virtual_offset + a_out->a_text);
351 error = exec_map_stack(imgp);
355 /* Fill in image_params */
356 imgp->interpreted = 0;
357 imgp->entry_addr = a_out->a_entry;
359 imgp->proc->p_sysent = &aout_sysvec;
365 * Tell kern_execve.c about it, with a little help from the linker.
367 static struct execsw aout_execsw = {
368 .ex_imgact = exec_aout_imgact,
371 EXEC_SET(aout, aout_execsw);