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 = {
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,
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,
75 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
77 .sv_set_syscall_retval = cpu_set_syscall_retval,
78 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
79 .sv_syscallnames = syscallnames,
80 .sv_shared_page_base = SHAREDPAGE,
81 .sv_shared_page_len = PAGE_SIZE,
83 .sv_thread_detach = NULL,
86 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
89 amd64_lower_shared_page(struct sysentvec *sv)
91 if (hw_lower_amd64_sharedpage != 0) {
92 sv->sv_maxuser -= PAGE_SIZE;
93 sv->sv_shared_page_base -= PAGE_SIZE;
94 sv->sv_usrstack -= PAGE_SIZE;
95 sv->sv_psstrings -= PAGE_SIZE;
100 * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter
101 * uses the value of sv_shared_page_base.
103 SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST,
104 (sysinit_cfunc_t) amd64_lower_shared_page,
105 &elf64_freebsd_sysvec);
107 static Elf64_Brandinfo freebsd_brand_info = {
108 .brand = ELFOSABI_FREEBSD,
109 .machine = EM_X86_64,
110 .compat_3_brand = "FreeBSD",
112 .interp_path = "/libexec/ld-elf.so.1",
113 .sysvec = &elf64_freebsd_sysvec,
114 .interp_newpath = NULL,
115 .brand_note = &elf64_freebsd_brandnote,
116 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
119 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
120 (sysinit_cfunc_t) elf64_insert_brand_entry,
121 &freebsd_brand_info);
123 static Elf64_Brandinfo freebsd_brand_oinfo = {
124 .brand = ELFOSABI_FREEBSD,
125 .machine = EM_X86_64,
126 .compat_3_brand = "FreeBSD",
128 .interp_path = "/usr/libexec/ld-elf.so.1",
129 .sysvec = &elf64_freebsd_sysvec,
130 .interp_newpath = NULL,
131 .brand_note = &elf64_freebsd_brandnote,
132 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
135 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
136 (sysinit_cfunc_t) elf64_insert_brand_entry,
137 &freebsd_brand_oinfo);
139 static Elf64_Brandinfo kfreebsd_brand_info = {
140 .brand = ELFOSABI_FREEBSD,
141 .machine = EM_X86_64,
142 .compat_3_brand = "FreeBSD",
144 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
145 .sysvec = &elf64_freebsd_sysvec,
146 .interp_newpath = NULL,
147 .brand_note = &elf64_kfreebsd_brandnote,
148 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
151 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
152 (sysinit_cfunc_t) elf64_insert_brand_entry,
153 &kfreebsd_brand_info);
156 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
165 len += elf64_populate_note(NT_X86_XSTATE,
166 get_pcb_user_save_td(td), dst,
167 cpu_max_ext_state_size, &buf);
168 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
171 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
172 cpu_max_ext_state_size, NULL);
178 elf_is_ifunc_reloc(Elf_Size r_info)
181 return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
184 /* Process one elf relocation with addend. */
186 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
187 int type, elf_lookup_fn lookup)
189 Elf64_Addr *where, val;
190 Elf32_Addr *where32, val32;
193 Elf_Size rtype, symidx;
195 const Elf_Rela *rela;
200 rel = (const Elf_Rel *)data;
201 where = (Elf_Addr *) (relocbase + rel->r_offset);
202 rtype = ELF_R_TYPE(rel->r_info);
203 symidx = ELF_R_SYM(rel->r_info);
204 /* Addend is 32 bit on 32 bit relocs */
209 addend = *(Elf32_Addr *)where;
217 rela = (const Elf_Rela *)data;
218 where = (Elf_Addr *) (relocbase + rela->r_offset);
219 addend = rela->r_addend;
220 rtype = ELF_R_TYPE(rela->r_info);
221 symidx = ELF_R_SYM(rela->r_info);
224 panic("unknown reloc type %d\n", type);
228 case R_X86_64_NONE: /* none */
231 case R_X86_64_64: /* S + A */
232 error = lookup(lf, symidx, 1, &addr);
240 case R_X86_64_PC32: /* S + A - P */
241 case R_X86_64_PLT32: /* L + A - P, L is PLT location for
242 the symbol, which we treat as S */
243 error = lookup(lf, symidx, 1, &addr);
244 where32 = (Elf32_Addr *)where;
245 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
248 if (*where32 != val32)
252 case R_X86_64_32S: /* S + A sign extend */
253 error = lookup(lf, symidx, 1, &addr);
254 val32 = (Elf32_Addr)(addr + addend);
255 where32 = (Elf32_Addr *)where;
258 if (*where32 != val32)
262 case R_X86_64_COPY: /* none */
264 * There shouldn't be copy relocations in kernel
267 printf("kldload: unexpected R_COPY relocation\n");
271 case R_X86_64_GLOB_DAT: /* S */
272 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
273 error = lookup(lf, symidx, 1, &addr);
280 case R_X86_64_RELATIVE: /* B + A */
281 addr = relocbase + addend;
287 case R_X86_64_IRELATIVE:
288 addr = relocbase + addend;
289 val = ((Elf64_Addr (*)(void))addr)();
295 printf("kldload: unexpected relocation type %ld\n",
303 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
304 elf_lookup_fn lookup)
307 return (elf_reloc_internal(lf, relocbase, data, type, lookup));
311 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
312 int type, elf_lookup_fn lookup)
315 return (elf_reloc_internal(lf, relocbase, data, type, lookup));
319 elf_cpu_load_file(linker_file_t lf __unused)
326 elf_cpu_unload_file(linker_file_t lf __unused)