1 /*-
2 * Copyright 1996-1998 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: releng/10.4/sys/i386/i386/elf_machdep.c 294136 2016-01-16 07:56:49Z dchagin $");
28
29 #include "opt_cpu.h"
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/exec.h>
35 #include <sys/imgact.h>
36 #include <sys/linker.h>
37 #include <sys/proc.h>
38 #include <sys/sysent.h>
39 #include <sys/imgact_elf.h>
40 #include <sys/syscall.h>
41 #include <sys/signalvar.h>
42 #include <sys/vnode.h>
43
44 #include <vm/vm.h>
45 #include <vm/pmap.h>
46 #include <vm/vm_param.h>
47
48 #include <machine/elf.h>
49 #include <machine/md_var.h>
50 #include <machine/npx.h>
51
52 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
53 #define CPU_ENABLE_SSE
54 #endif
55
56 struct sysentvec elf32_freebsd_sysvec = {
57 .sv_size = SYS_MAXSYSCALL,
58 .sv_table = sysent,
59 .sv_mask = 0,
60 .sv_sigsize = 0,
61 .sv_sigtbl = NULL,
62 .sv_errsize = 0,
63 .sv_errtbl = NULL,
64 .sv_transtrap = NULL,
65 .sv_fixup = __elfN(freebsd_fixup),
66 .sv_sendsig = sendsig,
67 .sv_sigcode = sigcode,
68 .sv_szsigcode = &szsigcode,
69 .sv_prepsyscall = NULL,
70 .sv_name = "FreeBSD ELF32",
71 .sv_coredump = __elfN(coredump),
72 .sv_imgact_try = NULL,
73 .sv_minsigstksz = MINSIGSTKSZ,
74 .sv_pagesize = PAGE_SIZE,
75 .sv_minuser = VM_MIN_ADDRESS,
76 .sv_maxuser = VM_MAXUSER_ADDRESS,
77 .sv_usrstack = USRSTACK,
78 .sv_psstrings = PS_STRINGS,
79 .sv_stackprot = VM_PROT_ALL,
80 .sv_copyout_strings = exec_copyout_strings,
81 .sv_setregs = exec_setregs,
82 .sv_fixlimit = NULL,
83 .sv_maxssiz = NULL,
84 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP,
85 .sv_set_syscall_retval = cpu_set_syscall_retval,
86 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
87 .sv_syscallnames = syscallnames,
88 .sv_shared_page_base = SHAREDPAGE,
89 .sv_shared_page_len = PAGE_SIZE,
90 .sv_schedtail = NULL,
91 .sv_thread_detach = NULL,
92 .sv_trap = NULL,
93 };
94 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
95
96 static Elf32_Brandinfo freebsd_brand_info = {
97 .brand = ELFOSABI_FREEBSD,
98 .machine = EM_386,
99 .compat_3_brand = "FreeBSD",
100 .emul_path = NULL,
101 .interp_path = "/libexec/ld-elf.so.1",
102 .sysvec = &elf32_freebsd_sysvec,
103 .interp_newpath = NULL,
104 .brand_note = &elf32_freebsd_brandnote,
105 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
106 };
107
108 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
109 (sysinit_cfunc_t) elf32_insert_brand_entry,
110 &freebsd_brand_info);
111
112 static Elf32_Brandinfo freebsd_brand_oinfo = {
113 .brand = ELFOSABI_FREEBSD,
114 .machine = EM_386,
115 .compat_3_brand = "FreeBSD",
116 .emul_path = NULL,
117 .interp_path = "/usr/libexec/ld-elf.so.1",
118 .sysvec = &elf32_freebsd_sysvec,
119 .interp_newpath = NULL,
120 .brand_note = &elf32_freebsd_brandnote,
121 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
122 };
123
124 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
125 (sysinit_cfunc_t) elf32_insert_brand_entry,
126 &freebsd_brand_oinfo);
127
128 static Elf32_Brandinfo kfreebsd_brand_info = {
129 .brand = ELFOSABI_FREEBSD,
130 .machine = EM_386,
131 .compat_3_brand = "FreeBSD",
132 .emul_path = NULL,
133 .interp_path = "/lib/ld.so.1",
134 .sysvec = &elf32_freebsd_sysvec,
135 .interp_newpath = NULL,
136 .brand_note = &elf32_kfreebsd_brandnote,
137 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
138 };
139
140 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
141 (sysinit_cfunc_t) elf32_insert_brand_entry,
142 &kfreebsd_brand_info);
143
144
145 void
146 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
147 {
148 #ifdef CPU_ENABLE_SSE
149 void *buf;
150 #endif
151 size_t len;
152
153 len = 0;
154 #ifdef CPU_ENABLE_SSE
155 if (use_xsave) {
156 if (dst != NULL) {
157 npxgetregs(td);
158 len += elf32_populate_note(NT_X86_XSTATE,
159 get_pcb_user_save_td(td), dst,
160 cpu_max_ext_state_size, &buf);
161 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
162 xsave_mask;
163 } else
164 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
165 cpu_max_ext_state_size, NULL);
166 }
167 #endif
168 *off = len;
169 }
170
171 /* Process one elf relocation with addend. */
172 static int
173 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
174 int type, int local, elf_lookup_fn lookup)
175 {
176 Elf_Addr *where;
177 Elf_Addr addr;
178 Elf_Addr addend;
179 Elf_Word rtype, symidx;
180 const Elf_Rel *rel;
181 const Elf_Rela *rela;
182 int error;
183
184 switch (type) {
185 case ELF_RELOC_REL:
186 rel = (const Elf_Rel *)data;
187 where = (Elf_Addr *) (relocbase + rel->r_offset);
188 addend = *where;
189 rtype = ELF_R_TYPE(rel->r_info);
190 symidx = ELF_R_SYM(rel->r_info);
191 break;
192 case ELF_RELOC_RELA:
193 rela = (const Elf_Rela *)data;
194 where = (Elf_Addr *) (relocbase + rela->r_offset);
195 addend = rela->r_addend;
196 rtype = ELF_R_TYPE(rela->r_info);
197 symidx = ELF_R_SYM(rela->r_info);
198 break;
199 default:
200 panic("unknown reloc type %d\n", type);
201 }
202
203 if (local) {
204 if (rtype == R_386_RELATIVE) { /* A + B */
205 addr = elf_relocaddr(lf, relocbase + addend);
206 if (*where != addr)
207 *where = addr;
208 }
209 return (0);
210 }
211
212 switch (rtype) {
213
214 case R_386_NONE: /* none */
215 break;
216
217 case R_386_32: /* S + A */
218 error = lookup(lf, symidx, 1, &addr);
219 if (error != 0)
220 return -1;
221 addr += addend;
222 if (*where != addr)
223 *where = addr;
224 break;
225
226 case R_386_PC32: /* S + A - P */
227 error = lookup(lf, symidx, 1, &addr);
228 if (error != 0)
229 return -1;
230 addr += addend - (Elf_Addr)where;
231 if (*where != addr)
232 *where = addr;
233 break;
234
235 case R_386_COPY: /* none */
236 /*
237 * There shouldn't be copy relocations in kernel
238 * objects.
239 */
240 printf("kldload: unexpected R_COPY relocation\n");
241 return -1;
242 break;
243
244 case R_386_GLOB_DAT: /* S */
245 error = lookup(lf, symidx, 1, &addr);
246 if (error != 0)
247 return -1;
248 if (*where != addr)
249 *where = addr;
250 break;
251
252 case R_386_RELATIVE:
253 break;
254
255 default:
256 printf("kldload: unexpected relocation type %d\n",
257 rtype);
258 return -1;
259 }
260 return(0);
261 }
262
263 int
264 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
265 elf_lookup_fn lookup)
266 {
267
268 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
269 }
270
271 int
272 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
273 int type, elf_lookup_fn lookup)
274 {
275
276 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
277 }
278
279 int
280 elf_cpu_load_file(linker_file_t lf __unused)
281 {
282
283 return (0);
284 }
285
286 int
287 elf_cpu_unload_file(linker_file_t lf __unused)
288 {
289
290 return (0);
291 }
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