2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright 1996-1998 John D. Polstra.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
35 #include <sys/imgact.h>
36 #include <sys/linker.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>
46 #include <vm/vm_param.h>
48 #include <machine/elf.h>
49 #include <machine/fpu.h>
50 #include <machine/md_var.h>
52 struct sysentvec elf64_freebsd_sysvec_la48 = {
53 .sv_size = SYS_MAXSYSCALL,
58 .sv_fixup = __elfN(freebsd_fixup),
59 .sv_sendsig = sendsig,
60 .sv_sigcode = sigcode,
61 .sv_szsigcode = &szsigcode,
62 .sv_name = "FreeBSD ELF64",
63 .sv_coredump = __elfN(coredump),
64 .sv_imgact_try = NULL,
65 .sv_minsigstksz = MINSIGSTKSZ,
66 .sv_minuser = VM_MIN_ADDRESS,
67 .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
68 .sv_usrstack = USRSTACK_LA48,
69 .sv_psstrings = PS_STRINGS_LA48,
70 .sv_stackprot = VM_PROT_ALL,
71 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
72 .sv_copyout_strings = exec_copyout_strings,
73 .sv_setregs = exec_setregs,
76 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
78 .sv_set_syscall_retval = cpu_set_syscall_retval,
79 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
80 .sv_syscallnames = syscallnames,
81 .sv_shared_page_base = SHAREDPAGE_LA48,
82 .sv_shared_page_len = PAGE_SIZE,
84 .sv_thread_detach = NULL,
86 .sv_stackgap = elf64_stackgap,
89 struct sysentvec elf64_freebsd_sysvec_la57 = {
90 .sv_size = SYS_MAXSYSCALL,
95 .sv_fixup = __elfN(freebsd_fixup),
96 .sv_sendsig = sendsig,
97 .sv_sigcode = sigcode,
98 .sv_szsigcode = &szsigcode,
99 .sv_name = "FreeBSD ELF64",
100 .sv_coredump = __elfN(coredump),
101 .sv_imgact_try = NULL,
102 .sv_minsigstksz = MINSIGSTKSZ,
103 .sv_minuser = VM_MIN_ADDRESS,
104 .sv_maxuser = VM_MAXUSER_ADDRESS_LA57,
105 .sv_usrstack = USRSTACK_LA57,
106 .sv_psstrings = PS_STRINGS_LA57,
107 .sv_stackprot = VM_PROT_ALL,
108 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
109 .sv_copyout_strings = exec_copyout_strings,
110 .sv_setregs = exec_setregs,
113 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
115 .sv_set_syscall_retval = cpu_set_syscall_retval,
116 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
117 .sv_syscallnames = syscallnames,
118 .sv_shared_page_base = SHAREDPAGE_LA57,
119 .sv_shared_page_len = PAGE_SIZE,
120 .sv_schedtail = NULL,
121 .sv_thread_detach = NULL,
123 .sv_stackgap = elf64_stackgap,
127 amd64_init_sysvecs(void *arg)
129 amd64_lower_shared_page(&elf64_freebsd_sysvec_la48);
131 exec_sysvec_init(&elf64_freebsd_sysvec_la57);
132 exec_sysvec_init_secondary(&elf64_freebsd_sysvec_la57,
133 &elf64_freebsd_sysvec_la48);
135 exec_sysvec_init(&elf64_freebsd_sysvec_la48);
138 SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, amd64_init_sysvecs, NULL);
141 amd64_lower_shared_page(struct sysentvec *sv)
143 if (hw_lower_amd64_sharedpage != 0) {
144 sv->sv_maxuser -= PAGE_SIZE;
145 sv->sv_shared_page_base -= PAGE_SIZE;
146 sv->sv_usrstack -= PAGE_SIZE;
147 sv->sv_psstrings -= PAGE_SIZE;
152 freebsd_brand_info_la57_img_compat(struct image_params *imgp,
153 int32_t *osrel __unused, uint32_t *fctl0)
155 if ((imgp->proc->p_md.md_flags & P_MD_LA57) != 0)
157 if (fctl0 == NULL || (*fctl0 & NT_FREEBSD_FCTL_LA48) != 0)
159 if ((imgp->proc->p_md.md_flags & P_MD_LA48) != 0)
164 static Elf64_Brandinfo freebsd_brand_info_la48 = {
165 .brand = ELFOSABI_FREEBSD,
166 .machine = EM_X86_64,
167 .compat_3_brand = "FreeBSD",
169 .interp_path = "/libexec/ld-elf.so.1",
170 .sysvec = &elf64_freebsd_sysvec_la48,
171 .interp_newpath = NULL,
172 .brand_note = &elf64_freebsd_brandnote,
173 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
176 static Elf64_Brandinfo freebsd_brand_info_la57 = {
177 .brand = ELFOSABI_FREEBSD,
178 .machine = EM_X86_64,
179 .compat_3_brand = "FreeBSD",
181 .interp_path = "/libexec/ld-elf.so.1",
182 .sysvec = &elf64_freebsd_sysvec_la57,
183 .interp_newpath = NULL,
184 .brand_note = &elf64_freebsd_brandnote,
185 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
186 .header_supported = freebsd_brand_info_la57_img_compat,
190 sysinit_register_elf64_brand_entries(void *arg __unused)
193 * _57 must go first so it can either claim the image or hand
197 elf64_insert_brand_entry(&freebsd_brand_info_la57);
198 elf64_insert_brand_entry(&freebsd_brand_info_la48);
200 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
201 sysinit_register_elf64_brand_entries, NULL);
203 static Elf64_Brandinfo freebsd_brand_oinfo = {
204 .brand = ELFOSABI_FREEBSD,
205 .machine = EM_X86_64,
206 .compat_3_brand = "FreeBSD",
208 .interp_path = "/usr/libexec/ld-elf.so.1",
209 .sysvec = &elf64_freebsd_sysvec_la48,
210 .interp_newpath = NULL,
211 .brand_note = &elf64_freebsd_brandnote,
212 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
215 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
216 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
218 static Elf64_Brandinfo kfreebsd_brand_info = {
219 .brand = ELFOSABI_FREEBSD,
220 .machine = EM_X86_64,
221 .compat_3_brand = "FreeBSD",
223 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
224 .sysvec = &elf64_freebsd_sysvec_la48,
225 .interp_newpath = NULL,
226 .brand_note = &elf64_kfreebsd_brandnote,
227 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
230 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
231 (sysinit_cfunc_t)elf64_insert_brand_entry, &kfreebsd_brand_info);
234 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
243 len += elf64_populate_note(NT_X86_XSTATE,
244 get_pcb_user_save_td(td), dst,
245 cpu_max_ext_state_size, &buf);
246 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
249 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
250 cpu_max_ext_state_size, NULL);
256 elf_is_ifunc_reloc(Elf_Size r_info)
259 return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
262 /* Process one elf relocation with addend. */
264 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
265 int type, bool late_ifunc, elf_lookup_fn lookup)
267 Elf64_Addr *where, val;
268 Elf32_Addr *where32, val32;
271 Elf_Size rtype, symidx;
273 const Elf_Rela *rela;
278 rel = (const Elf_Rel *)data;
279 where = (Elf_Addr *) (relocbase + rel->r_offset);
280 rtype = ELF_R_TYPE(rel->r_info);
281 symidx = ELF_R_SYM(rel->r_info);
282 /* Addend is 32 bit on 32 bit relocs */
287 addend = *(Elf32_Addr *)where;
295 rela = (const Elf_Rela *)data;
296 where = (Elf_Addr *) (relocbase + rela->r_offset);
297 addend = rela->r_addend;
298 rtype = ELF_R_TYPE(rela->r_info);
299 symidx = ELF_R_SYM(rela->r_info);
302 panic("unknown reloc type %d\n", type);
306 KASSERT(type == ELF_RELOC_RELA,
307 ("Only RELA ifunc relocations are supported"));
308 if (rtype != R_X86_64_IRELATIVE)
313 case R_X86_64_NONE: /* none */
316 case R_X86_64_64: /* S + A */
317 error = lookup(lf, symidx, 1, &addr);
325 case R_X86_64_PC32: /* S + A - P */
326 case R_X86_64_PLT32: /* L + A - P, L is PLT location for
327 the symbol, which we treat as S */
328 error = lookup(lf, symidx, 1, &addr);
329 where32 = (Elf32_Addr *)where;
330 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
333 if (*where32 != val32)
337 case R_X86_64_32S: /* S + A sign extend */
338 error = lookup(lf, symidx, 1, &addr);
339 val32 = (Elf32_Addr)(addr + addend);
340 where32 = (Elf32_Addr *)where;
343 if (*where32 != val32)
347 case R_X86_64_COPY: /* none */
349 * There shouldn't be copy relocations in kernel
352 printf("kldload: unexpected R_COPY relocation\n");
355 case R_X86_64_GLOB_DAT: /* S */
356 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
357 error = lookup(lf, symidx, 1, &addr);
364 case R_X86_64_RELATIVE: /* B + A */
365 addr = elf_relocaddr(lf, relocbase + addend);
371 case R_X86_64_IRELATIVE:
372 addr = relocbase + addend;
373 val = ((Elf64_Addr (*)(void))addr)();
379 printf("kldload: unexpected relocation type %ld\n",
387 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
388 elf_lookup_fn lookup)
391 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
395 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
396 int type, elf_lookup_fn lookup)
399 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
403 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
404 int type, elf_lookup_fn lookup)
407 return (elf_reloc_internal(lf, relocbase, data, type, true, lookup));
411 elf_cpu_load_file(linker_file_t lf __unused)
418 elf_cpu_unload_file(linker_file_t lf __unused)
425 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)