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/amd64/amd64/elf_machdep.c 293613 2016-01-09 20:18:53Z dchagin $");
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/exec.h>
33 #include <sys/imgact.h>
34 #include <sys/linker.h>
35 #include <sys/proc.h>
36 #include <sys/sysent.h>
37 #include <sys/imgact_elf.h>
38 #include <sys/syscall.h>
39 #include <sys/signalvar.h>
40 #include <sys/vnode.h>
41
42 #include <vm/vm.h>
43 #include <vm/pmap.h>
44 #include <vm/vm_param.h>
45
46 #include <machine/elf.h>
47 #include <machine/fpu.h>
48 #include <machine/md_var.h>
49
50 struct sysentvec elf64_freebsd_sysvec = {
51 .sv_size = SYS_MAXSYSCALL,
52 .sv_table = sysent,
53 .sv_mask = 0,
54 .sv_errsize = 0,
55 .sv_errtbl = NULL,
56 .sv_transtrap = NULL,
57 .sv_fixup = __elfN(freebsd_fixup),
58 .sv_sendsig = sendsig,
59 .sv_sigcode = sigcode,
60 .sv_szsigcode = &szsigcode,
61 .sv_name = "FreeBSD ELF64",
62 .sv_coredump = __elfN(coredump),
63 .sv_imgact_try = NULL,
64 .sv_minsigstksz = MINSIGSTKSZ,
65 .sv_pagesize = PAGE_SIZE,
66 .sv_minuser = VM_MIN_ADDRESS,
67 .sv_maxuser = VM_MAXUSER_ADDRESS,
68 .sv_usrstack = USRSTACK,
69 .sv_psstrings = PS_STRINGS,
70 .sv_stackprot = VM_PROT_ALL,
71 .sv_copyout_strings = exec_copyout_strings,
72 .sv_setregs = exec_setregs,
73 .sv_fixlimit = NULL,
74 .sv_maxssiz = NULL,
75 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP,
76 .sv_set_syscall_retval = cpu_set_syscall_retval,
77 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
78 .sv_syscallnames = syscallnames,
79 .sv_shared_page_base = SHAREDPAGE,
80 .sv_shared_page_len = PAGE_SIZE,
81 .sv_schedtail = NULL,
82 .sv_thread_detach = NULL,
83 .sv_trap = NULL,
84 };
85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
86
87 static Elf64_Brandinfo freebsd_brand_info = {
88 .brand = ELFOSABI_FREEBSD,
89 .machine = EM_X86_64,
90 .compat_3_brand = "FreeBSD",
91 .emul_path = NULL,
92 .interp_path = "/libexec/ld-elf.so.1",
93 .sysvec = &elf64_freebsd_sysvec,
94 .interp_newpath = NULL,
95 .brand_note = &elf64_freebsd_brandnote,
96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
97 };
98
99 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
100 (sysinit_cfunc_t) elf64_insert_brand_entry,
101 &freebsd_brand_info);
102
103 static Elf64_Brandinfo freebsd_brand_oinfo = {
104 .brand = ELFOSABI_FREEBSD,
105 .machine = EM_X86_64,
106 .compat_3_brand = "FreeBSD",
107 .emul_path = NULL,
108 .interp_path = "/usr/libexec/ld-elf.so.1",
109 .sysvec = &elf64_freebsd_sysvec,
110 .interp_newpath = NULL,
111 .brand_note = &elf64_freebsd_brandnote,
112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
113 };
114
115 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
116 (sysinit_cfunc_t) elf64_insert_brand_entry,
117 &freebsd_brand_oinfo);
118
119 static Elf64_Brandinfo kfreebsd_brand_info = {
120 .brand = ELFOSABI_FREEBSD,
121 .machine = EM_X86_64,
122 .compat_3_brand = "FreeBSD",
123 .emul_path = NULL,
124 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
125 .sysvec = &elf64_freebsd_sysvec,
126 .interp_newpath = NULL,
127 .brand_note = &elf64_kfreebsd_brandnote,
128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
129 };
130
131 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
132 (sysinit_cfunc_t) elf64_insert_brand_entry,
133 &kfreebsd_brand_info);
134
135 void
136 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
137 {
138 void *buf;
139 size_t len;
140
141 len = 0;
142 if (use_xsave) {
143 if (dst != NULL) {
144 fpugetregs(td);
145 len += elf64_populate_note(NT_X86_XSTATE,
146 get_pcb_user_save_td(td), dst,
147 cpu_max_ext_state_size, &buf);
148 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
149 xsave_mask;
150 } else
151 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
152 cpu_max_ext_state_size, NULL);
153 }
154 *off = len;
155 }
156
157 /* Process one elf relocation with addend. */
158 static int
159 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
160 int type, int local, elf_lookup_fn lookup)
161 {
162 Elf64_Addr *where, val;
163 Elf32_Addr *where32, val32;
164 Elf_Addr addr;
165 Elf_Addr addend;
166 Elf_Size rtype, symidx;
167 const Elf_Rel *rel;
168 const Elf_Rela *rela;
169 int error;
170
171 switch (type) {
172 case ELF_RELOC_REL:
173 rel = (const Elf_Rel *)data;
174 where = (Elf_Addr *) (relocbase + rel->r_offset);
175 rtype = ELF_R_TYPE(rel->r_info);
176 symidx = ELF_R_SYM(rel->r_info);
177 /* Addend is 32 bit on 32 bit relocs */
178 switch (rtype) {
179 case R_X86_64_PC32:
180 case R_X86_64_32S:
181 addend = *(Elf32_Addr *)where;
182 break;
183 default:
184 addend = *where;
185 break;
186 }
187 break;
188 case ELF_RELOC_RELA:
189 rela = (const Elf_Rela *)data;
190 where = (Elf_Addr *) (relocbase + rela->r_offset);
191 addend = rela->r_addend;
192 rtype = ELF_R_TYPE(rela->r_info);
193 symidx = ELF_R_SYM(rela->r_info);
194 break;
195 default:
196 panic("unknown reloc type %d\n", type);
197 }
198
199 switch (rtype) {
200
201 case R_X86_64_NONE: /* none */
202 break;
203
204 case R_X86_64_64: /* S + A */
205 error = lookup(lf, symidx, 1, &addr);
206 val = addr + addend;
207 if (error != 0)
208 return -1;
209 if (*where != val)
210 *where = val;
211 break;
212
213 case R_X86_64_PC32: /* S + A - P */
214 error = lookup(lf, symidx, 1, &addr);
215 where32 = (Elf32_Addr *)where;
216 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
217 if (error != 0)
218 return -1;
219 if (*where32 != val32)
220 *where32 = val32;
221 break;
222
223 case R_X86_64_32S: /* S + A sign extend */
224 error = lookup(lf, symidx, 1, &addr);
225 val32 = (Elf32_Addr)(addr + addend);
226 where32 = (Elf32_Addr *)where;
227 if (error != 0)
228 return -1;
229 if (*where32 != val32)
230 *where32 = val32;
231 break;
232
233 case R_X86_64_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_X86_64_GLOB_DAT: /* S */
243 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
244 error = lookup(lf, symidx, 1, &addr);
245 if (error != 0)
246 return -1;
247 if (*where != addr)
248 *where = addr;
249 break;
250
251 case R_X86_64_RELATIVE: /* B + A */
252 addr = relocbase + addend;
253 val = addr;
254 if (*where != val)
255 *where = val;
256 break;
257
258 default:
259 printf("kldload: unexpected relocation type %ld\n",
260 rtype);
261 return -1;
262 }
263 return(0);
264 }
265
266 int
267 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
268 elf_lookup_fn lookup)
269 {
270
271 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
272 }
273
274 int
275 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
276 int type, elf_lookup_fn lookup)
277 {
278
279 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
280 }
281
282 int
283 elf_cpu_load_file(linker_file_t lf __unused)
284 {
285
286 return (0);
287 }
288
289 int
290 elf_cpu_unload_file(linker_file_t lf __unused)
291 {
292
293 return (0);
294 }
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