xref: /freebsd/sys/compat/ia32/ia32_sysvec.c (revision ec0ea6efa1ad229d75c394c1a9b9cac33af2b1d3)
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 #include "vdso_ia32_offsets.h"
87 
88 extern const char _binary_elf_vdso32_so_1_start[];
89 extern const char _binary_elf_vdso32_so_1_end[];
90 extern char _binary_elf_vdso32_so_1_size;
91 
92 extern const char *freebsd32_syscallnames[];
93 
94 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
95     "ia32 mode");
96 
97 static u_long	ia32_maxdsiz = IA32_MAXDSIZ;
98 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, "");
99 u_long	ia32_maxssiz = IA32_MAXSSIZ;
100 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, "");
101 static u_long	ia32_maxvmem = IA32_MAXVMEM;
102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, "");
103 
104 struct sysentvec ia32_freebsd_sysvec = {
105 	.sv_size	= FREEBSD32_SYS_MAXSYSCALL,
106 	.sv_table	= freebsd32_sysent,
107 	.sv_transtrap	= NULL,
108 	.sv_fixup	= elf32_freebsd_fixup,
109 	.sv_sendsig	= ia32_sendsig,
110 	.sv_sigcode	= _binary_elf_vdso32_so_1_start,
111 	.sv_szsigcode	= (int *)&_binary_elf_vdso32_so_1_size,
112 	.sv_sigcodeoff	= VDSO_IA32_SIGCODE_OFFSET,
113 	.sv_name	= "FreeBSD ELF32",
114 	.sv_coredump	= elf32_coredump,
115 	.sv_elf_core_osabi = ELFOSABI_FREEBSD,
116 	.sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
117 	.sv_elf_core_prepare_notes = elf32_prepare_notes,
118 	.sv_imgact_try	= NULL,
119 	.sv_minsigstksz	= MINSIGSTKSZ,
120 	.sv_minuser	= FREEBSD32_MINUSER,
121 	.sv_maxuser	= FREEBSD32_MAXUSER,
122 	.sv_usrstack	= FREEBSD32_USRSTACK,
123 	.sv_psstrings	= FREEBSD32_PS_STRINGS,
124 	.sv_stackprot	= VM_PROT_ALL,
125 	.sv_copyout_auxargs	= elf32_freebsd_copyout_auxargs,
126 	.sv_copyout_strings	= freebsd32_copyout_strings,
127 	.sv_setregs	= ia32_setregs,
128 	.sv_fixlimit	= ia32_fixlimit,
129 	.sv_maxssiz	= &ia32_maxssiz,
130 	.sv_flags	= SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
131 			    SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER | SV_DSO_SIG,
132 	.sv_set_syscall_retval = ia32_set_syscall_retval,
133 	.sv_fetch_syscall_args = ia32_fetch_syscall_args,
134 	.sv_syscallnames = freebsd32_syscallnames,
135 	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
136 	.sv_shared_page_len = PAGE_SIZE,
137 	.sv_schedtail	= NULL,
138 	.sv_thread_detach = NULL,
139 	.sv_trap	= NULL,
140 	.sv_stackgap	= elf32_stackgap,
141 	.sv_onexec_old	= exec_onexec_old,
142 	.sv_onexit	= exit_onexit,
143 	.sv_set_fork_retval = x86_set_fork_retval,
144 };
145 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
146 
147 static Elf32_Brandinfo ia32_brand_info = {
148 	.brand		= ELFOSABI_FREEBSD,
149 	.machine	= EM_386,
150 	.compat_3_brand	= "FreeBSD",
151 	.emul_path	= NULL,
152 	.interp_path	= "/libexec/ld-elf.so.1",
153 	.sysvec		= &ia32_freebsd_sysvec,
154 	.interp_newpath	= "/libexec/ld-elf32.so.1",
155 	.brand_note	= &elf32_freebsd_brandnote,
156 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
157 };
158 
159 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
160 	(sysinit_cfunc_t) elf32_insert_brand_entry,
161 	&ia32_brand_info);
162 
163 static Elf32_Brandinfo ia32_brand_oinfo = {
164 	.brand		= ELFOSABI_FREEBSD,
165 	.machine	= EM_386,
166 	.compat_3_brand	= "FreeBSD",
167 	.emul_path	= NULL,
168 	.interp_path	= "/usr/libexec/ld-elf.so.1",
169 	.sysvec		= &ia32_freebsd_sysvec,
170 	.interp_newpath	= "/libexec/ld-elf32.so.1",
171 	.brand_note	= &elf32_freebsd_brandnote,
172 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
173 };
174 
175 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
176 	(sysinit_cfunc_t) elf32_insert_brand_entry,
177 	&ia32_brand_oinfo);
178 
179 static Elf32_Brandinfo kia32_brand_info = {
180 	.brand		= ELFOSABI_FREEBSD,
181 	.machine	= EM_386,
182 	.compat_3_brand	= "FreeBSD",
183 	.emul_path	= NULL,
184 	.interp_path	= "/lib/ld.so.1",
185 	.sysvec		= &ia32_freebsd_sysvec,
186 	.brand_note	= &elf32_kfreebsd_brandnote,
187 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
188 };
189 
190 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
191 	(sysinit_cfunc_t) elf32_insert_brand_entry,
192 	&kia32_brand_info);
193 
194 void
195 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
196 {
197 	void *buf;
198 	size_t len;
199 
200 	len = 0;
201 	if (use_xsave) {
202 		if (dst != NULL) {
203 			fpugetregs(td);
204 			len += elf32_populate_note(NT_X86_XSTATE,
205 			    get_pcb_user_save_td(td), dst,
206 			    cpu_max_ext_state_size, &buf);
207 			*(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
208 			    xsave_mask;
209 		} else
210 			len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
211 			    cpu_max_ext_state_size, NULL);
212 	}
213 	*off = len;
214 }
215 
216 void
217 ia32_fixlimit(struct rlimit *rl, int which)
218 {
219 
220 	switch (which) {
221 	case RLIMIT_DATA:
222 		if (ia32_maxdsiz != 0) {
223 			if (rl->rlim_cur > ia32_maxdsiz)
224 				rl->rlim_cur = ia32_maxdsiz;
225 			if (rl->rlim_max > ia32_maxdsiz)
226 				rl->rlim_max = ia32_maxdsiz;
227 		}
228 		break;
229 	case RLIMIT_STACK:
230 		if (ia32_maxssiz != 0) {
231 			if (rl->rlim_cur > ia32_maxssiz)
232 				rl->rlim_cur = ia32_maxssiz;
233 			if (rl->rlim_max > ia32_maxssiz)
234 				rl->rlim_max = ia32_maxssiz;
235 		}
236 		break;
237 	case RLIMIT_VMEM:
238 		if (ia32_maxvmem != 0) {
239 			if (rl->rlim_cur > ia32_maxvmem)
240 				rl->rlim_cur = ia32_maxvmem;
241 			if (rl->rlim_max > ia32_maxvmem)
242 				rl->rlim_max = ia32_maxvmem;
243 		}
244 		break;
245 	}
246 }
247