ia32_sysvec.c revision 171410 
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: head/sys/compat/ia32/ia32_sysvec.c 171410 2007-07-12 18:01:31Z jhb $");
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
86CTASSERT(sizeof(struct ia32_mcontext) == 640);
87CTASSERT(sizeof(struct ia32_ucontext) == 704);
88CTASSERT(sizeof(struct ia32_sigframe) == 800);
89CTASSERT(sizeof(struct siginfo32) == 64);
90#ifdef COMPAT_FREEBSD4
91CTASSERT(sizeof(struct ia32_mcontext4) == 260);
92CTASSERT(sizeof(struct ia32_ucontext4) == 324);
93CTASSERT(sizeof(struct ia32_sigframe4) == 408);
94#endif
95
96static register_t *ia32_copyout_strings(struct image_params *imgp);
97static void ia32_fixlimit(struct rlimit *rl, int which);
98
99extern struct sysent freebsd32_sysent[];
100
101SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
102
103static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
104SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
105static u_long	ia32_maxssiz = IA32_MAXSSIZ;
106SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
107static u_long	ia32_maxvmem = IA32_MAXVMEM;
108SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
109
110struct sysentvec ia32_freebsd_sysvec = {
111	FREEBSD32_SYS_MAXSYSCALL,
112	freebsd32_sysent,
113	0,
114	0,
115	NULL,
116	0,
117	NULL,
118	NULL,
119	elf32_freebsd_fixup,
120	ia32_sendsig,
121	ia32_sigcode,
122	&sz_ia32_sigcode,
123	NULL,
124	"FreeBSD ELF32",
125	elf32_coredump,
126	NULL,
127	MINSIGSTKSZ,
128	IA32_PAGE_SIZE,
129	0,
130	FREEBSD32_USRSTACK,
131	FREEBSD32_USRSTACK,
132	FREEBSD32_PS_STRINGS,
133	VM_PROT_ALL,
134	ia32_copyout_strings,
135	ia32_setregs,
136	ia32_fixlimit,
137	&ia32_maxssiz
138};
139
140
141static Elf32_Brandinfo ia32_brand_info = {
142						ELFOSABI_FREEBSD,
143						EM_386,
144						"FreeBSD",
145						NULL,
146						"/libexec/ld-elf.so.1",
147						&ia32_freebsd_sysvec,
148						"/libexec/ld-elf32.so.1",
149						BI_CAN_EXEC_DYN,
150					  };
151
152SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
153	(sysinit_cfunc_t) elf32_insert_brand_entry,
154	&ia32_brand_info);
155
156static Elf32_Brandinfo ia32_brand_oinfo = {
157						ELFOSABI_FREEBSD,
158						EM_386,
159						"FreeBSD",
160						NULL,
161						"/usr/libexec/ld-elf.so.1",
162						&ia32_freebsd_sysvec,
163						"/libexec/ld-elf32.so.1",
164						BI_CAN_EXEC_DYN,
165					  };
166
167SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
168	(sysinit_cfunc_t) elf32_insert_brand_entry,
169	&ia32_brand_oinfo);
170
171
172void
173elf32_dump_thread(struct thread *td __unused, void *dst __unused,
174    size_t *off __unused)
175{
176}
177
178
179/* XXX may be freebsd32 MI */
180static register_t *
181ia32_copyout_strings(struct image_params *imgp)
182{
183	int argc, envc;
184	u_int32_t *vectp;
185	char *stringp, *destp;
186	u_int32_t *stack_base;
187	struct freebsd32_ps_strings *arginfo;
188	int szsigcode;
189
190	/*
191	 * Calculate string base and vector table pointers.
192	 * Also deal with signal trampoline code for this exec type.
193	 */
194	arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
195	szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
196	destp =	(caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
197		roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
198
199	/*
200	 * install sigcode
201	 */
202	if (szsigcode)
203		copyout(imgp->proc->p_sysent->sv_sigcode,
204			((caddr_t)arginfo - szsigcode), szsigcode);
205
206	/*
207	 * If we have a valid auxargs ptr, prepare some room
208	 * on the stack.
209	 */
210	if (imgp->auxargs) {
211		/*
212		 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
213		 * lower compatibility.
214		 */
215		imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
216			: (AT_COUNT * 2);
217		/*
218		 * The '+ 2' is for the null pointers at the end of each of
219		 * the arg and env vector sets,and imgp->auxarg_size is room
220		 * for argument of Runtime loader.
221		 */
222		vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
223				       imgp->auxarg_size) * sizeof(u_int32_t));
224
225	} else
226		/*
227		 * The '+ 2' is for the null pointers at the end of each of
228		 * the arg and env vector sets
229		 */
230		vectp = (u_int32_t *)
231			(destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
232
233	/*
234	 * vectp also becomes our initial stack base
235	 */
236	stack_base = vectp;
237
238	stringp = imgp->args->begin_argv;
239	argc = imgp->args->argc;
240	envc = imgp->args->envc;
241	/*
242	 * Copy out strings - arguments and environment.
243	 */
244	copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
245
246	/*
247	 * Fill in "ps_strings" struct for ps, w, etc.
248	 */
249	suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
250	suword32(&arginfo->ps_nargvstr, argc);
251
252	/*
253	 * Fill in argument portion of vector table.
254	 */
255	for (; argc > 0; --argc) {
256		suword32(vectp++, (u_int32_t)(intptr_t)destp);
257		while (*stringp++ != 0)
258			destp++;
259		destp++;
260	}
261
262	/* a null vector table pointer separates the argp's from the envp's */
263	suword32(vectp++, 0);
264
265	suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
266	suword32(&arginfo->ps_nenvstr, envc);
267
268	/*
269	 * Fill in environment portion of vector table.
270	 */
271	for (; envc > 0; --envc) {
272		suword32(vectp++, (u_int32_t)(intptr_t)destp);
273		while (*stringp++ != 0)
274			destp++;
275		destp++;
276	}
277
278	/* end of vector table is a null pointer */
279	suword32(vectp, 0);
280
281	return ((register_t *)stack_base);
282}
283
284static void
285ia32_fixlimit(struct rlimit *rl, int which)
286{
287
288	switch (which) {
289	case RLIMIT_DATA:
290		if (ia32_maxdsiz != 0) {
291			if (rl->rlim_cur > ia32_maxdsiz)
292				rl->rlim_cur = ia32_maxdsiz;
293			if (rl->rlim_max > ia32_maxdsiz)
294				rl->rlim_max = ia32_maxdsiz;
295		}
296		break;
297	case RLIMIT_STACK:
298		if (ia32_maxssiz != 0) {
299			if (rl->rlim_cur > ia32_maxssiz)
300				rl->rlim_cur = ia32_maxssiz;
301			if (rl->rlim_max > ia32_maxssiz)
302				rl->rlim_max = ia32_maxssiz;
303		}
304		break;
305	case RLIMIT_VMEM:
306		if (ia32_maxvmem != 0) {
307			if (rl->rlim_cur > ia32_maxvmem)
308				rl->rlim_cur = ia32_maxvmem;
309			if (rl->rlim_max > ia32_maxvmem)
310				rl->rlim_max = ia32_maxvmem;
311		}
312		break;
313	}
314}
315