ia32_sysvec.c revision 127251 
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 127251 2004-03-21 01:22:24Z peter $");
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
85CTASSERT(sizeof(struct ia32_mcontext) == 640);
86CTASSERT(sizeof(struct ia32_ucontext) == 704);
87CTASSERT(sizeof(struct ia32_sigframe) == 800);
88CTASSERT(sizeof(struct ia32_siginfo) == 64);
89#ifdef COMPAT_FREEBSD4
90CTASSERT(sizeof(struct ia32_mcontext4) == 260);
91CTASSERT(sizeof(struct ia32_ucontext4) == 324);
92CTASSERT(sizeof(struct ia32_sigframe4) == 408);
93#endif
94
95static register_t *ia32_copyout_strings(struct image_params *imgp);
96static void ia32_fixlimits(struct image_params *imgp);
97
98extern struct sysent freebsd32_sysent[];
99
100SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
101
102struct 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
132static 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
142SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
143	(sysinit_cfunc_t) elf32_insert_brand_entry,
144	&ia32_brand_info);
145
146static 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						"/usr/libexec/ld-elf32.so.1",
154					  };
155
156SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
157	(sysinit_cfunc_t) elf32_insert_brand_entry,
158	&ia32_brand_oinfo);
159
160/* XXX may be freebsd32 MI */
161static register_t *
162ia32_copyout_strings(struct image_params *imgp)
163{
164	int argc, envc;
165	u_int32_t *vectp;
166	char *stringp, *destp;
167	u_int32_t *stack_base;
168	struct freebsd32_ps_strings *arginfo;
169	int szsigcode;
170
171	/*
172	 * Calculate string base and vector table pointers.
173	 * Also deal with signal trampoline code for this exec type.
174	 */
175	arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
176	szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
177	destp =	(caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
178		roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
179
180	/*
181	 * install sigcode
182	 */
183	if (szsigcode)
184		copyout(imgp->proc->p_sysent->sv_sigcode,
185			((caddr_t)arginfo - szsigcode), szsigcode);
186
187	/*
188	 * If we have a valid auxargs ptr, prepare some room
189	 * on the stack.
190	 */
191	if (imgp->auxargs) {
192		/*
193		 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
194		 * lower compatibility.
195		 */
196		imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
197			: (AT_COUNT * 2);
198		/*
199		 * The '+ 2' is for the null pointers at the end of each of
200		 * the arg and env vector sets,and imgp->auxarg_size is room
201		 * for argument of Runtime loader.
202		 */
203		vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 +
204				       imgp->auxarg_size) * sizeof(u_int32_t));
205
206	} else
207		/*
208		 * The '+ 2' is for the null pointers at the end of each of
209		 * the arg and env vector sets
210		 */
211		vectp = (u_int32_t *)
212			(destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
213
214	/*
215	 * vectp also becomes our initial stack base
216	 */
217	stack_base = vectp;
218
219	stringp = imgp->stringbase;
220	argc = imgp->argc;
221	envc = imgp->envc;
222	/*
223	 * Copy out strings - arguments and environment.
224	 */
225	copyout(stringp, destp, ARG_MAX - imgp->stringspace);
226
227	/*
228	 * Fill in "ps_strings" struct for ps, w, etc.
229	 */
230	suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
231	suword32(&arginfo->ps_nargvstr, argc);
232
233	/*
234	 * Fill in argument portion of vector table.
235	 */
236	for (; argc > 0; --argc) {
237		suword32(vectp++, (u_int32_t)(intptr_t)destp);
238		while (*stringp++ != 0)
239			destp++;
240		destp++;
241	}
242
243	/* a null vector table pointer separates the argp's from the envp's */
244	suword32(vectp++, 0);
245
246	suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
247	suword32(&arginfo->ps_nenvstr, envc);
248
249	/*
250	 * Fill in environment portion of vector table.
251	 */
252	for (; envc > 0; --envc) {
253		suword32(vectp++, (u_int32_t)(intptr_t)destp);
254		while (*stringp++ != 0)
255			destp++;
256		destp++;
257	}
258
259	/* end of vector table is a null pointer */
260	suword32(vectp, 0);
261
262	return ((register_t *)stack_base);
263}
264
265static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
266SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
267static u_long	ia32_maxssiz = IA32_MAXSSIZ;
268SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
269static u_long	ia32_maxvmem = IA32_MAXVMEM;
270SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
271
272static void
273ia32_fixlimits(struct image_params *imgp)
274{
275	struct proc *p = imgp->proc;
276	struct plimit *oldlim, *newlim;
277
278	if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0)
279		return;
280	newlim = lim_alloc();
281	PROC_LOCK(p);
282	oldlim = p->p_limit;
283	lim_copy(newlim, oldlim);
284	if (ia32_maxdsiz != 0) {
285		if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz)
286		    newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz;
287		if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz)
288		    newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz;
289	}
290	if (ia32_maxssiz != 0) {
291		if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz)
292		    newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz;
293		if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz)
294		    newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz;
295	}
296	if (ia32_maxvmem != 0) {
297		if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem)
298		    newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem;
299		if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem)
300		    newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem;
301	}
302	p->p_limit = newlim;
303	PROC_UNLOCK(p);
304	lim_free(oldlim);
305}
306