1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Doug Rabson
5 * Copyright (c) 2003 Peter Wemm
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
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/proc.h>
46 #include <sys/procfs.h>
47 #include <sys/resourcevar.h>
48 #include <sys/systm.h>
49 #include <sys/signalvar.h>
50 #include <sys/stat.h>
51 #include <sys/sx.h>
52 #include <sys/syscall.h>
53 #include <sys/sysctl.h>
54 #include <sys/sysent.h>
55 #include <sys/vnode.h>
56 #include <sys/imgact_elf.h>
57
58 #include <vm/vm.h>
59 #include <vm/vm_kern.h>
60 #include <vm/vm_param.h>
61 #include <vm/pmap.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_object.h>
64 #include <vm/vm_extern.h>
65
66 #include <compat/freebsd32/freebsd32_signal.h>
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 #include <machine/frame.h>
72 #include <machine/md_var.h>
73 #include <machine/pcb.h>
74 #include <machine/cpufunc.h>
75
76 CTASSERT(sizeof(struct ia32_mcontext) == 640);
77 CTASSERT(sizeof(struct ia32_ucontext) == 704);
78 CTASSERT(sizeof(struct ia32_sigframe) == 800);
79 CTASSERT(sizeof(struct siginfo32) == 64);
80 #ifdef COMPAT_FREEBSD4
81 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
82 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
83 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
84 #endif
85
86 extern const char *freebsd32_syscallnames[];
87
88 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
89 "ia32 mode");
90
91 static u_long ia32_maxdsiz = IA32_MAXDSIZ;
92 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, "");
93 u_long ia32_maxssiz = IA32_MAXSSIZ;
94 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, "");
95 static u_long ia32_maxvmem = IA32_MAXVMEM;
96 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, "");
97
98 struct sysentvec ia32_freebsd_sysvec = {
99 .sv_size = FREEBSD32_SYS_MAXSYSCALL,
100 .sv_table = freebsd32_sysent,
101 .sv_transtrap = NULL,
102 .sv_fixup = elf32_freebsd_fixup,
103 .sv_sendsig = ia32_sendsig,
104 .sv_sigcode = ia32_sigcode,
105 .sv_szsigcode = &sz_ia32_sigcode,
106 .sv_name = "FreeBSD ELF32",
107 .sv_coredump = elf32_coredump,
108 .sv_imgact_try = NULL,
109 .sv_minsigstksz = MINSIGSTKSZ,
110 .sv_minuser = FREEBSD32_MINUSER,
111 .sv_maxuser = FREEBSD32_MAXUSER,
112 .sv_usrstack = FREEBSD32_USRSTACK,
113 .sv_psstrings = FREEBSD32_PS_STRINGS,
114 .sv_stackprot = VM_PROT_ALL,
115 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs,
116 .sv_copyout_strings = freebsd32_copyout_strings,
117 .sv_setregs = ia32_setregs,
118 .sv_fixlimit = ia32_fixlimit,
119 .sv_maxssiz = &ia32_maxssiz,
120 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
121 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER,
122 .sv_set_syscall_retval = ia32_set_syscall_retval,
123 .sv_fetch_syscall_args = ia32_fetch_syscall_args,
124 .sv_syscallnames = freebsd32_syscallnames,
125 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
126 .sv_shared_page_len = PAGE_SIZE,
127 .sv_schedtail = NULL,
128 .sv_thread_detach = NULL,
129 .sv_trap = NULL,
130 .sv_stackgap = elf32_stackgap,
131 };
132 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
133
134 static Elf32_Brandinfo ia32_brand_info = {
135 .brand = ELFOSABI_FREEBSD,
136 .machine = EM_386,
137 .compat_3_brand = "FreeBSD",
138 .emul_path = NULL,
139 .interp_path = "/libexec/ld-elf.so.1",
140 .sysvec = &ia32_freebsd_sysvec,
141 .interp_newpath = "/libexec/ld-elf32.so.1",
142 .brand_note = &elf32_freebsd_brandnote,
143 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
144 };
145
146 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
147 (sysinit_cfunc_t) elf32_insert_brand_entry,
148 &ia32_brand_info);
149
150 static Elf32_Brandinfo ia32_brand_oinfo = {
151 .brand = ELFOSABI_FREEBSD,
152 .machine = EM_386,
153 .compat_3_brand = "FreeBSD",
154 .emul_path = NULL,
155 .interp_path = "/usr/libexec/ld-elf.so.1",
156 .sysvec = &ia32_freebsd_sysvec,
157 .interp_newpath = "/libexec/ld-elf32.so.1",
158 .brand_note = &elf32_freebsd_brandnote,
159 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
160 };
161
162 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
163 (sysinit_cfunc_t) elf32_insert_brand_entry,
164 &ia32_brand_oinfo);
165
166 static Elf32_Brandinfo kia32_brand_info = {
167 .brand = ELFOSABI_FREEBSD,
168 .machine = EM_386,
169 .compat_3_brand = "FreeBSD",
170 .emul_path = NULL,
171 .interp_path = "/lib/ld.so.1",
172 .sysvec = &ia32_freebsd_sysvec,
173 .brand_note = &elf32_kfreebsd_brandnote,
174 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
175 };
176
177 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
178 (sysinit_cfunc_t) elf32_insert_brand_entry,
179 &kia32_brand_info);
180
181 void
182 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
183 {
184 void *buf;
185 size_t len;
186
187 len = 0;
188 if (use_xsave) {
189 if (dst != NULL) {
190 fpugetregs(td);
191 len += elf32_populate_note(NT_X86_XSTATE,
192 get_pcb_user_save_td(td), dst,
193 cpu_max_ext_state_size, &buf);
194 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
195 xsave_mask;
196 } else
197 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
198 cpu_max_ext_state_size, NULL);
199 }
200 *off = len;
201 }
202
203 void
204 ia32_fixlimit(struct rlimit *rl, int which)
205 {
206
207 switch (which) {
208 case RLIMIT_DATA:
209 if (ia32_maxdsiz != 0) {
210 if (rl->rlim_cur > ia32_maxdsiz)
211 rl->rlim_cur = ia32_maxdsiz;
212 if (rl->rlim_max > ia32_maxdsiz)
213 rl->rlim_max = ia32_maxdsiz;
214 }
215 break;
216 case RLIMIT_STACK:
217 if (ia32_maxssiz != 0) {
218 if (rl->rlim_cur > ia32_maxssiz)
219 rl->rlim_cur = ia32_maxssiz;
220 if (rl->rlim_max > ia32_maxssiz)
221 rl->rlim_max = ia32_maxssiz;
222 }
223 break;
224 case RLIMIT_VMEM:
225 if (ia32_maxvmem != 0) {
226 if (rl->rlim_cur > ia32_maxvmem)
227 rl->rlim_cur = ia32_maxvmem;
228 if (rl->rlim_max > ia32_maxvmem)
229 rl->rlim_max = ia32_maxvmem;
230 }
231 break;
232 }
233 }
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