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: src/sys/compat/ia32/ia32_sysvec.c,v 1.30 2008/11/22 12:36:15 kib Exp $");
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_signal.h>
68 #include <compat/freebsd32/freebsd32_util.h>
69 #include <compat/freebsd32/freebsd32_proto.h>
70 #include <compat/freebsd32/freebsd32_syscall.h>
71 #include <compat/ia32/ia32_signal.h>
72 #ifdef __amd64__
73 #include <machine/psl.h>
74 #include <machine/segments.h>
75 #include <machine/specialreg.h>
76 #else
77 #include <i386/include/psl.h>
78 #include <i386/include/segments.h>
79 #include <i386/include/specialreg.h>
80 #endif
81 #include <machine/frame.h>
82 #include <machine/md_var.h>
83 #include <machine/pcb.h>
84 #include <machine/cpufunc.h>
85
86 CTASSERT(sizeof(struct ia32_mcontext) == 640);
87 CTASSERT(sizeof(struct ia32_ucontext) == 704);
88 CTASSERT(sizeof(struct ia32_sigframe) == 800);
89 CTASSERT(sizeof(struct siginfo32) == 64);
90 #ifdef COMPAT_FREEBSD4
91 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
92 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
93 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
94 #endif
95
96 static register_t *ia32_copyout_strings(struct image_params *imgp);
97 static void ia32_fixlimit(struct rlimit *rl, int which);
98
99 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
100
101 static u_long ia32_maxdsiz = IA32_MAXDSIZ;
102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
103 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
104 static u_long ia32_maxssiz = IA32_MAXSSIZ;
105 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
106 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
107 static u_long ia32_maxvmem = IA32_MAXVMEM;
108 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
109 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
110
111 struct sysentvec ia32_freebsd_sysvec = {
112 .sv_size = FREEBSD32_SYS_MAXSYSCALL,
113 .sv_table = freebsd32_sysent,
114 .sv_mask = 0,
115 .sv_sigsize = 0,
116 .sv_sigtbl = NULL,
117 .sv_errsize = 0,
118 .sv_errtbl = NULL,
119 .sv_transtrap = NULL,
120 .sv_fixup = elf32_freebsd_fixup,
121 .sv_sendsig = ia32_sendsig,
122 .sv_sigcode = ia32_sigcode,
123 .sv_szsigcode = &sz_ia32_sigcode,
124 .sv_prepsyscall = NULL,
125 .sv_name = "FreeBSD ELF32",
126 .sv_coredump = elf32_coredump,
127 .sv_imgact_try = NULL,
128 .sv_minsigstksz = MINSIGSTKSZ,
129 .sv_pagesize = IA32_PAGE_SIZE,
130 .sv_minuser = 0,
131 .sv_maxuser = FREEBSD32_USRSTACK,
132 .sv_usrstack = FREEBSD32_USRSTACK,
133 .sv_psstrings = FREEBSD32_PS_STRINGS,
134 .sv_stackprot = VM_PROT_ALL,
135 .sv_copyout_strings = ia32_copyout_strings,
136 .sv_setregs = ia32_setregs,
137 .sv_fixlimit = ia32_fixlimit,
138 .sv_maxssiz = &ia32_maxssiz,
139 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32
140 };
141
142
143 static Elf32_Brandinfo ia32_brand_info = {
144 .brand = ELFOSABI_FREEBSD,
145 .machine = EM_386,
146 .compat_3_brand = "FreeBSD",
147 .emul_path = NULL,
148 .interp_path = "/libexec/ld-elf.so.1",
149 .sysvec = &ia32_freebsd_sysvec,
150 .interp_newpath = "/libexec/ld-elf32.so.1",
151 .flags = BI_CAN_EXEC_DYN
152 };
153
154 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
155 (sysinit_cfunc_t) elf32_insert_brand_entry,
156 &ia32_brand_info);
157
158 static Elf32_Brandinfo ia32_brand_oinfo = {
159 .brand = ELFOSABI_FREEBSD,
160 .machine = EM_386,
161 .compat_3_brand = "FreeBSD",
162 .emul_path = NULL,
163 .interp_path = "/usr/libexec/ld-elf.so.1",
164 .sysvec = &ia32_freebsd_sysvec,
165 .interp_newpath = "/libexec/ld-elf32.so.1",
166 .flags = BI_CAN_EXEC_DYN,
167 };
168
169 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
170 (sysinit_cfunc_t) elf32_insert_brand_entry,
171 &ia32_brand_oinfo);
172
173
174 void
175 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
176 size_t *off __unused)
177 {
178 }
179
180
181 /* XXX may be freebsd32 MI */
182 static register_t *
183 ia32_copyout_strings(struct image_params *imgp)
184 {
185 int argc, envc;
186 u_int32_t *vectp;
187 char *stringp, *destp;
188 u_int32_t *stack_base;
189 struct freebsd32_ps_strings *arginfo;
190 int szsigcode;
191
192 /*
193 * Calculate string base and vector table pointers.
194 * Also deal with signal trampoline code for this exec type.
195 */
196 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
197 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
198 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
199 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
200
201 /*
202 * install sigcode
203 */
204 if (szsigcode)
205 copyout(imgp->proc->p_sysent->sv_sigcode,
206 ((caddr_t)arginfo - szsigcode), szsigcode);
207
208 /*
209 * If we have a valid auxargs ptr, prepare some room
210 * on the stack.
211 */
212 if (imgp->auxargs) {
213 /*
214 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
215 * lower compatibility.
216 */
217 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
218 : (AT_COUNT * 2);
219 /*
220 * The '+ 2' is for the null pointers at the end of each of
221 * the arg and env vector sets,and imgp->auxarg_size is room
222 * for argument of Runtime loader.
223 */
224 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
225 imgp->auxarg_size) * sizeof(u_int32_t));
226
227 } else
228 /*
229 * The '+ 2' is for the null pointers at the end of each of
230 * the arg and env vector sets
231 */
232 vectp = (u_int32_t *)
233 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
234
235 /*
236 * vectp also becomes our initial stack base
237 */
238 stack_base = vectp;
239
240 stringp = imgp->args->begin_argv;
241 argc = imgp->args->argc;
242 envc = imgp->args->envc;
243 /*
244 * Copy out strings - arguments and environment.
245 */
246 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
247
248 /*
249 * Fill in "ps_strings" struct for ps, w, etc.
250 */
251 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
252 suword32(&arginfo->ps_nargvstr, argc);
253
254 /*
255 * Fill in argument portion of vector table.
256 */
257 for (; argc > 0; --argc) {
258 suword32(vectp++, (u_int32_t)(intptr_t)destp);
259 while (*stringp++ != 0)
260 destp++;
261 destp++;
262 }
263
264 /* a null vector table pointer separates the argp's from the envp's */
265 suword32(vectp++, 0);
266
267 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
268 suword32(&arginfo->ps_nenvstr, envc);
269
270 /*
271 * Fill in environment portion of vector table.
272 */
273 for (; envc > 0; --envc) {
274 suword32(vectp++, (u_int32_t)(intptr_t)destp);
275 while (*stringp++ != 0)
276 destp++;
277 destp++;
278 }
279
280 /* end of vector table is a null pointer */
281 suword32(vectp, 0);
282
283 return ((register_t *)stack_base);
284 }
285
286 static void
287 ia32_fixlimit(struct rlimit *rl, int which)
288 {
289
290 switch (which) {
291 case RLIMIT_DATA:
292 if (ia32_maxdsiz != 0) {
293 if (rl->rlim_cur > ia32_maxdsiz)
294 rl->rlim_cur = ia32_maxdsiz;
295 if (rl->rlim_max > ia32_maxdsiz)
296 rl->rlim_max = ia32_maxdsiz;
297 }
298 break;
299 case RLIMIT_STACK:
300 if (ia32_maxssiz != 0) {
301 if (rl->rlim_cur > ia32_maxssiz)
302 rl->rlim_cur = ia32_maxssiz;
303 if (rl->rlim_max > ia32_maxssiz)
304 rl->rlim_max = ia32_maxssiz;
305 }
306 break;
307 case RLIMIT_VMEM:
308 if (ia32_maxvmem != 0) {
309 if (rl->rlim_cur > ia32_maxvmem)
310 rl->rlim_cur = ia32_maxvmem;
311 if (rl->rlim_max > ia32_maxvmem)
312 rl->rlim_max = ia32_maxvmem;
313 }
314 break;
315 }
316 }
317 Cache object: 0939cbdc4310a950c30020f18ae4c342
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