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: stable/11/sys/compat/ia32/ia32_sysvec.c 315302 2017-03-15 10:53:40Z kib $");
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#include <machine/frame.h>
73#include <machine/md_var.h>
74#include <machine/pcb.h>
75#include <machine/cpufunc.h>
76
77CTASSERT(sizeof(struct ia32_mcontext) == 640);
78CTASSERT(sizeof(struct ia32_ucontext) == 704);
79CTASSERT(sizeof(struct ia32_sigframe) == 800);
80CTASSERT(sizeof(struct siginfo32) == 64);
81#ifdef COMPAT_FREEBSD4
82CTASSERT(sizeof(struct ia32_mcontext4) == 260);
83CTASSERT(sizeof(struct ia32_ucontext4) == 324);
84CTASSERT(sizeof(struct ia32_sigframe4) == 408);
85#endif
86
87extern const char *freebsd32_syscallnames[];
88
89static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
90
91static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
92SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, "");
93u_long	ia32_maxssiz = IA32_MAXSSIZ;
94SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, "");
95static u_long	ia32_maxvmem = IA32_MAXVMEM;
96SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, "");
97
98struct sysentvec ia32_freebsd_sysvec = {
99	.sv_size	= FREEBSD32_SYS_MAXSYSCALL,
100	.sv_table	= freebsd32_sysent,
101	.sv_mask	= 0,
102	.sv_errsize	= 0,
103	.sv_errtbl	= NULL,
104	.sv_transtrap	= NULL,
105	.sv_fixup	= elf32_freebsd_fixup,
106	.sv_sendsig	= ia32_sendsig,
107	.sv_sigcode	= ia32_sigcode,
108	.sv_szsigcode	= &sz_ia32_sigcode,
109	.sv_name	= "FreeBSD ELF32",
110	.sv_coredump	= elf32_coredump,
111	.sv_imgact_try	= NULL,
112	.sv_minsigstksz	= MINSIGSTKSZ,
113	.sv_pagesize	= IA32_PAGE_SIZE,
114	.sv_minuser	= FREEBSD32_MINUSER,
115	.sv_maxuser	= FREEBSD32_MAXUSER,
116	.sv_usrstack	= FREEBSD32_USRSTACK,
117	.sv_psstrings	= FREEBSD32_PS_STRINGS,
118	.sv_stackprot	= VM_PROT_ALL,
119	.sv_copyout_strings	= freebsd32_copyout_strings,
120	.sv_setregs	= ia32_setregs,
121	.sv_fixlimit	= ia32_fixlimit,
122	.sv_maxssiz	= &ia32_maxssiz,
123	.sv_flags	= SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 |
124			    SV_SHP | SV_TIMEKEEP,
125	.sv_set_syscall_retval = ia32_set_syscall_retval,
126	.sv_fetch_syscall_args = ia32_fetch_syscall_args,
127	.sv_syscallnames = freebsd32_syscallnames,
128	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
129	.sv_shared_page_len = PAGE_SIZE,
130	.sv_schedtail	= NULL,
131	.sv_thread_detach = NULL,
132	.sv_trap	= NULL,
133};
134INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
135
136static Elf32_Brandinfo ia32_brand_info = {
137	.brand		= ELFOSABI_FREEBSD,
138	.machine	= EM_386,
139	.compat_3_brand	= "FreeBSD",
140	.emul_path	= NULL,
141	.interp_path	= "/libexec/ld-elf.so.1",
142	.sysvec		= &ia32_freebsd_sysvec,
143	.interp_newpath	= "/libexec/ld-elf32.so.1",
144	.brand_note	= &elf32_freebsd_brandnote,
145	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
146};
147
148SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
149	(sysinit_cfunc_t) elf32_insert_brand_entry,
150	&ia32_brand_info);
151
152static Elf32_Brandinfo ia32_brand_oinfo = {
153	.brand		= ELFOSABI_FREEBSD,
154	.machine	= EM_386,
155	.compat_3_brand	= "FreeBSD",
156	.emul_path	= NULL,
157	.interp_path	= "/usr/libexec/ld-elf.so.1",
158	.sysvec		= &ia32_freebsd_sysvec,
159	.interp_newpath	= "/libexec/ld-elf32.so.1",
160	.brand_note	= &elf32_freebsd_brandnote,
161	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
162};
163
164SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
165	(sysinit_cfunc_t) elf32_insert_brand_entry,
166	&ia32_brand_oinfo);
167
168static Elf32_Brandinfo kia32_brand_info = {
169	.brand		= ELFOSABI_FREEBSD,
170	.machine	= EM_386,
171	.compat_3_brand	= "FreeBSD",
172	.emul_path	= NULL,
173	.interp_path	= "/lib/ld.so.1",
174	.sysvec		= &ia32_freebsd_sysvec,
175	.brand_note	= &elf32_kfreebsd_brandnote,
176	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
177};
178
179SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
180	(sysinit_cfunc_t) elf32_insert_brand_entry,
181	&kia32_brand_info);
182
183void
184elf32_dump_thread(struct thread *td, void *dst, size_t *off)
185{
186	void *buf;
187	size_t len;
188
189	len = 0;
190	if (use_xsave) {
191		if (dst != NULL) {
192			fpugetregs(td);
193			len += elf32_populate_note(NT_X86_XSTATE,
194			    get_pcb_user_save_td(td), dst,
195			    cpu_max_ext_state_size, &buf);
196			*(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
197			    xsave_mask;
198		} else
199			len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
200			    cpu_max_ext_state_size, NULL);
201	}
202	*off = len;
203}
204
205void
206ia32_fixlimit(struct rlimit *rl, int which)
207{
208
209	switch (which) {
210	case RLIMIT_DATA:
211		if (ia32_maxdsiz != 0) {
212			if (rl->rlim_cur > ia32_maxdsiz)
213				rl->rlim_cur = ia32_maxdsiz;
214			if (rl->rlim_max > ia32_maxdsiz)
215				rl->rlim_max = ia32_maxdsiz;
216		}
217		break;
218	case RLIMIT_STACK:
219		if (ia32_maxssiz != 0) {
220			if (rl->rlim_cur > ia32_maxssiz)
221				rl->rlim_cur = ia32_maxssiz;
222			if (rl->rlim_max > ia32_maxssiz)
223				rl->rlim_max = ia32_maxssiz;
224		}
225		break;
226	case RLIMIT_VMEM:
227		if (ia32_maxvmem != 0) {
228			if (rl->rlim_cur > ia32_maxvmem)
229				rl->rlim_cur = ia32_maxvmem;
230			if (rl->rlim_max > ia32_maxvmem)
231				rl->rlim_max = ia32_maxvmem;
232		}
233		break;
234	}
235}
236