xref: /freebsd/sys/compat/ia32/ia32_sysvec.c (revision 74bf4e164ba5851606a27d4feff27717452583e5)
1 /*-
2  * Copyright (c) 2002 Doug Rabson
3  * Copyright (c) 2003 Peter Wemm
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30 
31 #include "opt_compat.h"
32 
33 #define __ELF_WORD_SIZE 32
34 
35 #include <sys/param.h>
36 #include <sys/exec.h>
37 #include <sys/fcntl.h>
38 #include <sys/imgact.h>
39 #include <sys/kernel.h>
40 #include <sys/lock.h>
41 #include <sys/malloc.h>
42 #include <sys/mutex.h>
43 #include <sys/mman.h>
44 #include <sys/namei.h>
45 #include <sys/pioctl.h>
46 #include <sys/proc.h>
47 #include <sys/procfs.h>
48 #include <sys/resourcevar.h>
49 #include <sys/systm.h>
50 #include <sys/signalvar.h>
51 #include <sys/stat.h>
52 #include <sys/sx.h>
53 #include <sys/syscall.h>
54 #include <sys/sysctl.h>
55 #include <sys/sysent.h>
56 #include <sys/vnode.h>
57 #include <sys/imgact_elf.h>
58 
59 #include <vm/vm.h>
60 #include <vm/vm_kern.h>
61 #include <vm/vm_param.h>
62 #include <vm/pmap.h>
63 #include <vm/vm_map.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_extern.h>
66 
67 #include <compat/freebsd32/freebsd32_util.h>
68 #include <compat/freebsd32/freebsd32_proto.h>
69 #include <compat/freebsd32/freebsd32_syscall.h>
70 #include <compat/ia32/ia32_signal.h>
71 #ifdef __amd64__
72 #include <machine/psl.h>
73 #include <machine/segments.h>
74 #include <machine/specialreg.h>
75 #else
76 #include <i386/include/psl.h>
77 #include <i386/include/segments.h>
78 #include <i386/include/specialreg.h>
79 #endif
80 #include <machine/frame.h>
81 #include <machine/md_var.h>
82 #include <machine/pcb.h>
83 #include <machine/cpufunc.h>
84 
85 CTASSERT(sizeof(struct ia32_mcontext) == 640);
86 CTASSERT(sizeof(struct ia32_ucontext) == 704);
87 CTASSERT(sizeof(struct ia32_sigframe) == 800);
88 CTASSERT(sizeof(struct ia32_siginfo) == 64);
89 #ifdef COMPAT_FREEBSD4
90 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
91 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
92 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
93 #endif
94 
95 static register_t *ia32_copyout_strings(struct image_params *imgp);
96 static void ia32_fixlimits(struct image_params *imgp);
97 
98 extern struct sysent freebsd32_sysent[];
99 
100 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
101 
102 struct sysentvec ia32_freebsd_sysvec = {
103 	FREEBSD32_SYS_MAXSYSCALL,
104 	freebsd32_sysent,
105 	0,
106 	0,
107 	NULL,
108 	0,
109 	NULL,
110 	NULL,
111 	elf32_freebsd_fixup,
112 	ia32_sendsig,
113 	ia32_sigcode,
114 	&sz_ia32_sigcode,
115 	NULL,
116 	"FreeBSD ELF32",
117 	elf32_coredump,
118 	NULL,
119 	MINSIGSTKSZ,
120 	IA32_PAGE_SIZE,
121 	0,
122 	FREEBSD32_USRSTACK,
123 	FREEBSD32_USRSTACK,
124 	FREEBSD32_PS_STRINGS,
125 	VM_PROT_ALL,
126 	ia32_copyout_strings,
127 	ia32_setregs,
128 	ia32_fixlimits
129 };
130 
131 
132 static Elf32_Brandinfo ia32_brand_info = {
133 						ELFOSABI_FREEBSD,
134 						EM_386,
135 						"FreeBSD",
136 						NULL,
137 						"/libexec/ld-elf.so.1",
138 						&ia32_freebsd_sysvec,
139 						"/libexec/ld-elf32.so.1",
140 					  };
141 
142 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
143 	(sysinit_cfunc_t) elf32_insert_brand_entry,
144 	&ia32_brand_info);
145 
146 static Elf32_Brandinfo ia32_brand_oinfo = {
147 						ELFOSABI_FREEBSD,
148 						EM_386,
149 						"FreeBSD",
150 						NULL,
151 						"/usr/libexec/ld-elf.so.1",
152 						&ia32_freebsd_sysvec,
153 						"/libexec/ld-elf32.so.1",
154 					  };
155 
156 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
157 	(sysinit_cfunc_t) elf32_insert_brand_entry,
158 	&ia32_brand_oinfo);
159 
160 
161 void
162 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
163     size_t *off __unused)
164 {
165 }
166 
167 
168 /* XXX may be freebsd32 MI */
169 static register_t *
170 ia32_copyout_strings(struct image_params *imgp)
171 {
172 	int argc, envc;
173 	u_int32_t *vectp;
174 	char *stringp, *destp;
175 	u_int32_t *stack_base;
176 	struct freebsd32_ps_strings *arginfo;
177 	int szsigcode;
178 
179 	/*
180 	 * Calculate string base and vector table pointers.
181 	 * Also deal with signal trampoline code for this exec type.
182 	 */
183 	arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
184 	szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
185 	destp =	(caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
186 		roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
187 
188 	/*
189 	 * install sigcode
190 	 */
191 	if (szsigcode)
192 		copyout(imgp->proc->p_sysent->sv_sigcode,
193 			((caddr_t)arginfo - szsigcode), szsigcode);
194 
195 	/*
196 	 * If we have a valid auxargs ptr, prepare some room
197 	 * on the stack.
198 	 */
199 	if (imgp->auxargs) {
200 		/*
201 		 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
202 		 * lower compatibility.
203 		 */
204 		imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
205 			: (AT_COUNT * 2);
206 		/*
207 		 * The '+ 2' is for the null pointers at the end of each of
208 		 * the arg and env vector sets,and imgp->auxarg_size is room
209 		 * for argument of Runtime loader.
210 		 */
211 		vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 +
212 				       imgp->auxarg_size) * sizeof(u_int32_t));
213 
214 	} else
215 		/*
216 		 * The '+ 2' is for the null pointers at the end of each of
217 		 * the arg and env vector sets
218 		 */
219 		vectp = (u_int32_t *)
220 			(destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
221 
222 	/*
223 	 * vectp also becomes our initial stack base
224 	 */
225 	stack_base = vectp;
226 
227 	stringp = imgp->stringbase;
228 	argc = imgp->argc;
229 	envc = imgp->envc;
230 	/*
231 	 * Copy out strings - arguments and environment.
232 	 */
233 	copyout(stringp, destp, ARG_MAX - imgp->stringspace);
234 
235 	/*
236 	 * Fill in "ps_strings" struct for ps, w, etc.
237 	 */
238 	suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
239 	suword32(&arginfo->ps_nargvstr, argc);
240 
241 	/*
242 	 * Fill in argument portion of vector table.
243 	 */
244 	for (; argc > 0; --argc) {
245 		suword32(vectp++, (u_int32_t)(intptr_t)destp);
246 		while (*stringp++ != 0)
247 			destp++;
248 		destp++;
249 	}
250 
251 	/* a null vector table pointer separates the argp's from the envp's */
252 	suword32(vectp++, 0);
253 
254 	suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
255 	suword32(&arginfo->ps_nenvstr, envc);
256 
257 	/*
258 	 * Fill in environment portion of vector table.
259 	 */
260 	for (; envc > 0; --envc) {
261 		suword32(vectp++, (u_int32_t)(intptr_t)destp);
262 		while (*stringp++ != 0)
263 			destp++;
264 		destp++;
265 	}
266 
267 	/* end of vector table is a null pointer */
268 	suword32(vectp, 0);
269 
270 	return ((register_t *)stack_base);
271 }
272 
273 static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
274 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
275 static u_long	ia32_maxssiz = IA32_MAXSSIZ;
276 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
277 static u_long	ia32_maxvmem = IA32_MAXVMEM;
278 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
279 
280 static void
281 ia32_fixlimits(struct image_params *imgp)
282 {
283 	struct proc *p = imgp->proc;
284 	struct plimit *oldlim, *newlim;
285 
286 	if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0)
287 		return;
288 	newlim = lim_alloc();
289 	PROC_LOCK(p);
290 	oldlim = p->p_limit;
291 	lim_copy(newlim, oldlim);
292 	if (ia32_maxdsiz != 0) {
293 		if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz)
294 		    newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz;
295 		if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz)
296 		    newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz;
297 	}
298 	if (ia32_maxssiz != 0) {
299 		if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz)
300 		    newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz;
301 		if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz)
302 		    newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz;
303 	}
304 	if (ia32_maxvmem != 0) {
305 		if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem)
306 		    newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem;
307 		if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem)
308 		    newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem;
309 	}
310 	p->p_limit = newlim;
311 	PROC_UNLOCK(p);
312 	lim_free(oldlim);
313 }
314