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/11.0/sys/i386/i386/elf_machdep.c 293613 2016-01-09 20:18:53Z 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_errsize = 0,
61 .sv_errtbl = NULL,
62 .sv_transtrap = NULL,
63 .sv_fixup = __elfN(freebsd_fixup),
64 .sv_sendsig = sendsig,
65 .sv_sigcode = sigcode,
66 .sv_szsigcode = &szsigcode,
67 .sv_name = "FreeBSD ELF32",
68 .sv_coredump = __elfN(coredump),
69 .sv_imgact_try = NULL,
70 .sv_minsigstksz = MINSIGSTKSZ,
71 .sv_pagesize = PAGE_SIZE,
72 .sv_minuser = VM_MIN_ADDRESS,
73 .sv_maxuser = VM_MAXUSER_ADDRESS,
74 .sv_usrstack = USRSTACK,
75 .sv_psstrings = PS_STRINGS,
76 .sv_stackprot = VM_PROT_ALL,
77 .sv_copyout_strings = exec_copyout_strings,
78 .sv_setregs = exec_setregs,
79 .sv_fixlimit = NULL,
80 .sv_maxssiz = NULL,
81 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP |
82 SV_TIMEKEEP,
83 .sv_set_syscall_retval = cpu_set_syscall_retval,
84 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
85 .sv_syscallnames = syscallnames,
86 .sv_shared_page_base = SHAREDPAGE,
87 .sv_shared_page_len = PAGE_SIZE,
88 .sv_schedtail = NULL,
89 .sv_thread_detach = NULL,
90 .sv_trap = NULL,
91 };
92 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
93
94 static Elf32_Brandinfo freebsd_brand_info = {
95 .brand = ELFOSABI_FREEBSD,
96 .machine = EM_386,
97 .compat_3_brand = "FreeBSD",
98 .emul_path = NULL,
99 .interp_path = "/libexec/ld-elf.so.1",
100 .sysvec = &elf32_freebsd_sysvec,
101 .interp_newpath = NULL,
102 .brand_note = &elf32_freebsd_brandnote,
103 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
104 };
105
106 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
107 (sysinit_cfunc_t) elf32_insert_brand_entry,
108 &freebsd_brand_info);
109
110 static Elf32_Brandinfo freebsd_brand_oinfo = {
111 .brand = ELFOSABI_FREEBSD,
112 .machine = EM_386,
113 .compat_3_brand = "FreeBSD",
114 .emul_path = NULL,
115 .interp_path = "/usr/libexec/ld-elf.so.1",
116 .sysvec = &elf32_freebsd_sysvec,
117 .interp_newpath = NULL,
118 .brand_note = &elf32_freebsd_brandnote,
119 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
120 };
121
122 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
123 (sysinit_cfunc_t) elf32_insert_brand_entry,
124 &freebsd_brand_oinfo);
125
126 static Elf32_Brandinfo kfreebsd_brand_info = {
127 .brand = ELFOSABI_FREEBSD,
128 .machine = EM_386,
129 .compat_3_brand = "FreeBSD",
130 .emul_path = NULL,
131 .interp_path = "/lib/ld.so.1",
132 .sysvec = &elf32_freebsd_sysvec,
133 .interp_newpath = NULL,
134 .brand_note = &elf32_kfreebsd_brandnote,
135 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
136 };
137
138 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
139 (sysinit_cfunc_t) elf32_insert_brand_entry,
140 &kfreebsd_brand_info);
141
142
143 void
144 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
145 {
146 #ifdef CPU_ENABLE_SSE
147 void *buf;
148 #endif
149 size_t len;
150
151 len = 0;
152 #ifdef CPU_ENABLE_SSE
153 if (use_xsave) {
154 if (dst != NULL) {
155 npxgetregs(td);
156 len += elf32_populate_note(NT_X86_XSTATE,
157 get_pcb_user_save_td(td), dst,
158 cpu_max_ext_state_size, &buf);
159 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
160 xsave_mask;
161 } else
162 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
163 cpu_max_ext_state_size, NULL);
164 }
165 #endif
166 *off = len;
167 }
168
169 /* Process one elf relocation with addend. */
170 static int
171 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
172 int type, int local, elf_lookup_fn lookup)
173 {
174 Elf_Addr *where;
175 Elf_Addr addr;
176 Elf_Addr addend;
177 Elf_Word rtype, symidx;
178 const Elf_Rel *rel;
179 const Elf_Rela *rela;
180 int error;
181
182 switch (type) {
183 case ELF_RELOC_REL:
184 rel = (const Elf_Rel *)data;
185 where = (Elf_Addr *) (relocbase + rel->r_offset);
186 addend = *where;
187 rtype = ELF_R_TYPE(rel->r_info);
188 symidx = ELF_R_SYM(rel->r_info);
189 break;
190 case ELF_RELOC_RELA:
191 rela = (const Elf_Rela *)data;
192 where = (Elf_Addr *) (relocbase + rela->r_offset);
193 addend = rela->r_addend;
194 rtype = ELF_R_TYPE(rela->r_info);
195 symidx = ELF_R_SYM(rela->r_info);
196 break;
197 default:
198 panic("unknown reloc type %d\n", type);
199 }
200
201 if (local) {
202 if (rtype == R_386_RELATIVE) { /* A + B */
203 addr = elf_relocaddr(lf, relocbase + addend);
204 if (*where != addr)
205 *where = addr;
206 }
207 return (0);
208 }
209
210 switch (rtype) {
211
212 case R_386_NONE: /* none */
213 break;
214
215 case R_386_32: /* S + A */
216 error = lookup(lf, symidx, 1, &addr);
217 if (error != 0)
218 return -1;
219 addr += addend;
220 if (*where != addr)
221 *where = addr;
222 break;
223
224 case R_386_PC32: /* S + A - P */
225 error = lookup(lf, symidx, 1, &addr);
226 if (error != 0)
227 return -1;
228 addr += addend - (Elf_Addr)where;
229 if (*where != addr)
230 *where = addr;
231 break;
232
233 case R_386_COPY: /* none */
234 /*
235 * There shouldn't be copy relocations in kernel
236 * objects.
237 */
238 printf("kldload: unexpected R_COPY relocation\n");
239 return -1;
240 break;
241
242 case R_386_GLOB_DAT: /* S */
243 error = lookup(lf, symidx, 1, &addr);
244 if (error != 0)
245 return -1;
246 if (*where != addr)
247 *where = addr;
248 break;
249
250 case R_386_RELATIVE:
251 break;
252
253 default:
254 printf("kldload: unexpected relocation type %d\n",
255 rtype);
256 return -1;
257 }
258 return(0);
259 }
260
261 int
262 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
263 elf_lookup_fn lookup)
264 {
265
266 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
267 }
268
269 int
270 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
271 int type, elf_lookup_fn lookup)
272 {
273
274 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
275 }
276
277 int
278 elf_cpu_load_file(linker_file_t lf __unused)
279 {
280
281 return (0);
282 }
283
284 int
285 elf_cpu_unload_file(linker_file_t lf __unused)
286 {
287
288 return (0);
289 }
Cache object: d68e304119252e4c4a7ce0c3f9434921
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