ia32_sysvec.c revision 183365 
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 183365 2008-09-25 20:50:21Z 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
99SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
100
101static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
102SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
103TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
104static u_long	ia32_maxssiz = IA32_MAXSSIZ;
105SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
106TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
107static u_long	ia32_maxvmem = IA32_MAXVMEM;
108SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
109TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
110
111struct 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};
140
141
142static Elf32_Brandinfo ia32_brand_info = {
143	.brand		= ELFOSABI_FREEBSD,
144	.machine	= EM_386,
145	.compat_3_brand	= "FreeBSD",
146	.emul_path	= NULL,
147	.interp_path	= "/libexec/ld-elf.so.1",
148	.sysvec		= &ia32_freebsd_sysvec,
149	.interp_newpath	= "/libexec/ld-elf32.so.1",
150	.flags		= BI_CAN_EXEC_DYN
151};
152
153SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
154	(sysinit_cfunc_t) elf32_insert_brand_entry,
155	&ia32_brand_info);
156
157static Elf32_Brandinfo ia32_brand_oinfo = {
158	.brand		= ELFOSABI_FREEBSD,
159	.machine	= EM_386,
160	.compat_3_brand	= "FreeBSD",
161	.emul_path	= NULL,
162	.interp_path	= "/usr/libexec/ld-elf.so.1",
163	.sysvec		= &ia32_freebsd_sysvec,
164	.interp_newpath	= "/libexec/ld-elf32.so.1",
165	.flags		= BI_CAN_EXEC_DYN,
166};
167
168SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
169	(sysinit_cfunc_t) elf32_insert_brand_entry,
170	&ia32_brand_oinfo);
171
172
173void
174elf32_dump_thread(struct thread *td __unused, void *dst __unused,
175    size_t *off __unused)
176{
177}
178
179
180/* XXX may be freebsd32 MI */
181static register_t *
182ia32_copyout_strings(struct image_params *imgp)
183{
184	int argc, envc;
185	u_int32_t *vectp;
186	char *stringp, *destp;
187	u_int32_t *stack_base;
188	struct freebsd32_ps_strings *arginfo;
189	int szsigcode;
190
191	/*
192	 * Calculate string base and vector table pointers.
193	 * Also deal with signal trampoline code for this exec type.
194	 */
195	arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
196	szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
197	destp =	(caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
198		roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
199
200	/*
201	 * install sigcode
202	 */
203	if (szsigcode)
204		copyout(imgp->proc->p_sysent->sv_sigcode,
205			((caddr_t)arginfo - szsigcode), szsigcode);
206
207	/*
208	 * If we have a valid auxargs ptr, prepare some room
209	 * on the stack.
210	 */
211	if (imgp->auxargs) {
212		/*
213		 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
214		 * lower compatibility.
215		 */
216		imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
217			: (AT_COUNT * 2);
218		/*
219		 * The '+ 2' is for the null pointers at the end of each of
220		 * the arg and env vector sets,and imgp->auxarg_size is room
221		 * for argument of Runtime loader.
222		 */
223		vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
224				       imgp->auxarg_size) * sizeof(u_int32_t));
225
226	} else
227		/*
228		 * The '+ 2' is for the null pointers at the end of each of
229		 * the arg and env vector sets
230		 */
231		vectp = (u_int32_t *)
232			(destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
233
234	/*
235	 * vectp also becomes our initial stack base
236	 */
237	stack_base = vectp;
238
239	stringp = imgp->args->begin_argv;
240	argc = imgp->args->argc;
241	envc = imgp->args->envc;
242	/*
243	 * Copy out strings - arguments and environment.
244	 */
245	copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
246
247	/*
248	 * Fill in "ps_strings" struct for ps, w, etc.
249	 */
250	suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
251	suword32(&arginfo->ps_nargvstr, argc);
252
253	/*
254	 * Fill in argument portion of vector table.
255	 */
256	for (; argc > 0; --argc) {
257		suword32(vectp++, (u_int32_t)(intptr_t)destp);
258		while (*stringp++ != 0)
259			destp++;
260		destp++;
261	}
262
263	/* a null vector table pointer separates the argp's from the envp's */
264	suword32(vectp++, 0);
265
266	suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
267	suword32(&arginfo->ps_nenvstr, envc);
268
269	/*
270	 * Fill in environment portion of vector table.
271	 */
272	for (; envc > 0; --envc) {
273		suword32(vectp++, (u_int32_t)(intptr_t)destp);
274		while (*stringp++ != 0)
275			destp++;
276		destp++;
277	}
278
279	/* end of vector table is a null pointer */
280	suword32(vectp, 0);
281
282	return ((register_t *)stack_base);
283}
284
285static void
286ia32_fixlimit(struct rlimit *rl, int which)
287{
288
289	switch (which) {
290	case RLIMIT_DATA:
291		if (ia32_maxdsiz != 0) {
292			if (rl->rlim_cur > ia32_maxdsiz)
293				rl->rlim_cur = ia32_maxdsiz;
294			if (rl->rlim_max > ia32_maxdsiz)
295				rl->rlim_max = ia32_maxdsiz;
296		}
297		break;
298	case RLIMIT_STACK:
299		if (ia32_maxssiz != 0) {
300			if (rl->rlim_cur > ia32_maxssiz)
301				rl->rlim_cur = ia32_maxssiz;
302			if (rl->rlim_max > ia32_maxssiz)
303				rl->rlim_max = ia32_maxssiz;
304		}
305		break;
306	case RLIMIT_VMEM:
307		if (ia32_maxvmem != 0) {
308			if (rl->rlim_cur > ia32_maxvmem)
309				rl->rlim_cur = ia32_maxvmem;
310			if (rl->rlim_max > ia32_maxvmem)
311				rl->rlim_max = ia32_maxvmem;
312		}
313		break;
314	}
315}
316