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,
56 .sv_fixup = __elfN(freebsd_fixup),
57 .sv_sendsig = sendsig,
58 .sv_sigcode = sigcode,
59 .sv_szsigcode = &szsigcode,
60 .sv_name = "FreeBSD ELF64",
61 .sv_coredump = __elfN(coredump),
62 .sv_imgact_try = NULL,
63 .sv_minsigstksz = MINSIGSTKSZ,
64 .sv_minuser = VM_MIN_ADDRESS,
65 .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
66 .sv_usrstack = USRSTACK_LA48,
67 .sv_psstrings = PS_STRINGS_LA48,
68 .sv_stackprot = VM_PROT_ALL,
69 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
70 .sv_copyout_strings = exec_copyout_strings,
71 .sv_setregs = exec_setregs,
74 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
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_LA48,
80 .sv_shared_page_len = PAGE_SIZE,
82 .sv_thread_detach = NULL,
84 .sv_stackgap = elf64_stackgap,
87 struct sysentvec elf64_freebsd_sysvec_la57 = {
88 .sv_size = SYS_MAXSYSCALL,
91 .sv_fixup = __elfN(freebsd_fixup),
92 .sv_sendsig = sendsig,
93 .sv_sigcode = sigcode,
94 .sv_szsigcode = &szsigcode,
95 .sv_name = "FreeBSD ELF64",
96 .sv_coredump = __elfN(coredump),
97 .sv_imgact_try = NULL,
98 .sv_minsigstksz = MINSIGSTKSZ,
99 .sv_minuser = VM_MIN_ADDRESS,
100 .sv_maxuser = VM_MAXUSER_ADDRESS_LA57,
101 .sv_usrstack = USRSTACK_LA57,
102 .sv_psstrings = PS_STRINGS_LA57,
103 .sv_stackprot = VM_PROT_ALL,
104 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
105 .sv_copyout_strings = exec_copyout_strings,
106 .sv_setregs = exec_setregs,
109 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
111 .sv_set_syscall_retval = cpu_set_syscall_retval,
112 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
113 .sv_syscallnames = syscallnames,
114 .sv_shared_page_base = SHAREDPAGE_LA57,
115 .sv_shared_page_len = PAGE_SIZE,
116 .sv_schedtail = NULL,
117 .sv_thread_detach = NULL,
119 .sv_stackgap = elf64_stackgap,
123 amd64_init_sysvecs(void *arg)
125 amd64_lower_shared_page(&elf64_freebsd_sysvec_la48);
127 exec_sysvec_init(&elf64_freebsd_sysvec_la57);
128 exec_sysvec_init_secondary(&elf64_freebsd_sysvec_la57,
129 &elf64_freebsd_sysvec_la48);
131 exec_sysvec_init(&elf64_freebsd_sysvec_la48);
134 SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, amd64_init_sysvecs, NULL);
137 amd64_lower_shared_page(struct sysentvec *sv)
139 if (hw_lower_amd64_sharedpage != 0) {
140 sv->sv_maxuser -= PAGE_SIZE;
141 sv->sv_shared_page_base -= PAGE_SIZE;
142 sv->sv_usrstack -= PAGE_SIZE;
143 sv->sv_psstrings -= PAGE_SIZE;
148 freebsd_brand_info_la57_img_compat(struct image_params *imgp,
149 int32_t *osrel __unused, uint32_t *fctl0)
151 if ((imgp->proc->p_md.md_flags & P_MD_LA57) != 0)
153 if (fctl0 == NULL || (*fctl0 & NT_FREEBSD_FCTL_LA48) != 0)
155 if ((imgp->proc->p_md.md_flags & P_MD_LA48) != 0)
160 static Elf64_Brandinfo freebsd_brand_info_la48 = {
161 .brand = ELFOSABI_FREEBSD,
162 .machine = EM_X86_64,
163 .compat_3_brand = "FreeBSD",
165 .interp_path = "/libexec/ld-elf.so.1",
166 .sysvec = &elf64_freebsd_sysvec_la48,
167 .interp_newpath = NULL,
168 .brand_note = &elf64_freebsd_brandnote,
169 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
172 static Elf64_Brandinfo freebsd_brand_info_la57 = {
173 .brand = ELFOSABI_FREEBSD,
174 .machine = EM_X86_64,
175 .compat_3_brand = "FreeBSD",
177 .interp_path = "/libexec/ld-elf.so.1",
178 .sysvec = &elf64_freebsd_sysvec_la57,
179 .interp_newpath = NULL,
180 .brand_note = &elf64_freebsd_brandnote,
181 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
182 .header_supported = freebsd_brand_info_la57_img_compat,
186 sysinit_register_elf64_brand_entries(void *arg __unused)
189 * _57 must go first so it can either claim the image or hand
193 elf64_insert_brand_entry(&freebsd_brand_info_la57);
194 elf64_insert_brand_entry(&freebsd_brand_info_la48);
196 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
197 sysinit_register_elf64_brand_entries, NULL);
199 static Elf64_Brandinfo freebsd_brand_oinfo = {
200 .brand = ELFOSABI_FREEBSD,
201 .machine = EM_X86_64,
202 .compat_3_brand = "FreeBSD",
204 .interp_path = "/usr/libexec/ld-elf.so.1",
205 .sysvec = &elf64_freebsd_sysvec_la48,
206 .interp_newpath = NULL,
207 .brand_note = &elf64_freebsd_brandnote,
208 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
211 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
212 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
214 static Elf64_Brandinfo kfreebsd_brand_info = {
215 .brand = ELFOSABI_FREEBSD,
216 .machine = EM_X86_64,
217 .compat_3_brand = "FreeBSD",
219 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
220 .sysvec = &elf64_freebsd_sysvec_la48,
221 .interp_newpath = NULL,
222 .brand_note = &elf64_kfreebsd_brandnote,
223 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
226 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
227 (sysinit_cfunc_t)elf64_insert_brand_entry, &kfreebsd_brand_info);
230 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
239 len += elf64_populate_note(NT_X86_XSTATE,
240 get_pcb_user_save_td(td), dst,
241 cpu_max_ext_state_size, &buf);
242 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
245 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
246 cpu_max_ext_state_size, NULL);
252 elf_is_ifunc_reloc(Elf_Size r_info)
255 return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
258 /* Process one elf relocation with addend. */
260 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
261 int type, bool late_ifunc, elf_lookup_fn lookup)
263 Elf64_Addr *where, val;
264 Elf32_Addr *where32, val32;
267 Elf_Size rtype, symidx;
269 const Elf_Rela *rela;
274 rel = (const Elf_Rel *)data;
275 where = (Elf_Addr *) (relocbase + rel->r_offset);
276 rtype = ELF_R_TYPE(rel->r_info);
277 symidx = ELF_R_SYM(rel->r_info);
278 /* Addend is 32 bit on 32 bit relocs */
283 addend = *(Elf32_Addr *)where;
291 rela = (const Elf_Rela *)data;
292 where = (Elf_Addr *) (relocbase + rela->r_offset);
293 addend = rela->r_addend;
294 rtype = ELF_R_TYPE(rela->r_info);
295 symidx = ELF_R_SYM(rela->r_info);
298 panic("unknown reloc type %d\n", type);
302 KASSERT(type == ELF_RELOC_RELA,
303 ("Only RELA ifunc relocations are supported"));
304 if (rtype != R_X86_64_IRELATIVE)
309 case R_X86_64_NONE: /* none */
312 case R_X86_64_64: /* S + A */
313 error = lookup(lf, symidx, 1, &addr);
321 case R_X86_64_PC32: /* S + A - P */
322 case R_X86_64_PLT32: /* L + A - P, L is PLT location for
323 the symbol, which we treat as S */
324 error = lookup(lf, symidx, 1, &addr);
325 where32 = (Elf32_Addr *)where;
326 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
329 if (*where32 != val32)
333 case R_X86_64_32S: /* S + A sign extend */
334 error = lookup(lf, symidx, 1, &addr);
335 val32 = (Elf32_Addr)(addr + addend);
336 where32 = (Elf32_Addr *)where;
339 if (*where32 != val32)
343 case R_X86_64_COPY: /* none */
345 * There shouldn't be copy relocations in kernel
348 printf("kldload: unexpected R_COPY relocation\n");
351 case R_X86_64_GLOB_DAT: /* S */
352 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
353 error = lookup(lf, symidx, 1, &addr);
360 case R_X86_64_RELATIVE: /* B + A */
361 addr = elf_relocaddr(lf, relocbase + addend);
367 case R_X86_64_IRELATIVE:
368 addr = relocbase + addend;
369 val = ((Elf64_Addr (*)(void))addr)();
375 printf("kldload: unexpected relocation type %ld\n",
383 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
384 elf_lookup_fn lookup)
387 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
391 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
392 int type, elf_lookup_fn lookup)
395 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
399 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
400 int type, elf_lookup_fn lookup)
403 return (elf_reloc_internal(lf, relocbase, data, type, true, lookup));
407 elf_cpu_load_file(linker_file_t lf __unused)
414 elf_cpu_unload_file(linker_file_t lf __unused)
421 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)