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_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,
82 .sv_shared_page_len = PAGE_SIZE,
84 .sv_thread_detach = NULL,
86 .sv_stackgap = elf64_stackgap,
88 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
91 amd64_lower_shared_page(struct sysentvec *sv)
93 if (hw_lower_amd64_sharedpage != 0) {
94 sv->sv_maxuser -= PAGE_SIZE;
95 sv->sv_shared_page_base -= PAGE_SIZE;
96 sv->sv_usrstack -= PAGE_SIZE;
97 sv->sv_psstrings -= PAGE_SIZE;
102 * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter
103 * uses the value of sv_shared_page_base.
105 SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST,
106 (sysinit_cfunc_t) amd64_lower_shared_page,
107 &elf64_freebsd_sysvec);
109 static Elf64_Brandinfo freebsd_brand_info = {
110 .brand = ELFOSABI_FREEBSD,
111 .machine = EM_X86_64,
112 .compat_3_brand = "FreeBSD",
114 .interp_path = "/libexec/ld-elf.so.1",
115 .sysvec = &elf64_freebsd_sysvec,
116 .interp_newpath = NULL,
117 .brand_note = &elf64_freebsd_brandnote,
118 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
121 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
122 (sysinit_cfunc_t) elf64_insert_brand_entry,
123 &freebsd_brand_info);
125 static Elf64_Brandinfo freebsd_brand_oinfo = {
126 .brand = ELFOSABI_FREEBSD,
127 .machine = EM_X86_64,
128 .compat_3_brand = "FreeBSD",
130 .interp_path = "/usr/libexec/ld-elf.so.1",
131 .sysvec = &elf64_freebsd_sysvec,
132 .interp_newpath = NULL,
133 .brand_note = &elf64_freebsd_brandnote,
134 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
137 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
138 (sysinit_cfunc_t) elf64_insert_brand_entry,
139 &freebsd_brand_oinfo);
141 static Elf64_Brandinfo kfreebsd_brand_info = {
142 .brand = ELFOSABI_FREEBSD,
143 .machine = EM_X86_64,
144 .compat_3_brand = "FreeBSD",
146 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
147 .sysvec = &elf64_freebsd_sysvec,
148 .interp_newpath = NULL,
149 .brand_note = &elf64_kfreebsd_brandnote,
150 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
153 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
154 (sysinit_cfunc_t) elf64_insert_brand_entry,
155 &kfreebsd_brand_info);
158 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
167 len += elf64_populate_note(NT_X86_XSTATE,
168 get_pcb_user_save_td(td), dst,
169 cpu_max_ext_state_size, &buf);
170 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
173 len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
174 cpu_max_ext_state_size, NULL);
180 elf_is_ifunc_reloc(Elf_Size r_info)
183 return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
186 /* Process one elf relocation with addend. */
188 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
189 int type, bool late_ifunc, elf_lookup_fn lookup)
191 Elf64_Addr *where, val;
192 Elf32_Addr *where32, val32;
195 Elf_Size rtype, symidx;
197 const Elf_Rela *rela;
202 rel = (const Elf_Rel *)data;
203 where = (Elf_Addr *) (relocbase + rel->r_offset);
204 rtype = ELF_R_TYPE(rel->r_info);
205 symidx = ELF_R_SYM(rel->r_info);
206 /* Addend is 32 bit on 32 bit relocs */
211 addend = *(Elf32_Addr *)where;
219 rela = (const Elf_Rela *)data;
220 where = (Elf_Addr *) (relocbase + rela->r_offset);
221 addend = rela->r_addend;
222 rtype = ELF_R_TYPE(rela->r_info);
223 symidx = ELF_R_SYM(rela->r_info);
226 panic("unknown reloc type %d\n", type);
230 KASSERT(type == ELF_RELOC_RELA,
231 ("Only RELA ifunc relocations are supported"));
232 if (rtype != R_X86_64_IRELATIVE)
237 case R_X86_64_NONE: /* none */
240 case R_X86_64_64: /* S + A */
241 error = lookup(lf, symidx, 1, &addr);
249 case R_X86_64_PC32: /* S + A - P */
250 case R_X86_64_PLT32: /* L + A - P, L is PLT location for
251 the symbol, which we treat as S */
252 error = lookup(lf, symidx, 1, &addr);
253 where32 = (Elf32_Addr *)where;
254 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
257 if (*where32 != val32)
261 case R_X86_64_32S: /* S + A sign extend */
262 error = lookup(lf, symidx, 1, &addr);
263 val32 = (Elf32_Addr)(addr + addend);
264 where32 = (Elf32_Addr *)where;
267 if (*where32 != val32)
271 case R_X86_64_COPY: /* none */
273 * There shouldn't be copy relocations in kernel
276 printf("kldload: unexpected R_COPY relocation\n");
279 case R_X86_64_GLOB_DAT: /* S */
280 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
281 error = lookup(lf, symidx, 1, &addr);
288 case R_X86_64_RELATIVE: /* B + A */
289 addr = elf_relocaddr(lf, relocbase + addend);
295 case R_X86_64_IRELATIVE:
296 addr = relocbase + addend;
297 val = ((Elf64_Addr (*)(void))addr)();
303 printf("kldload: unexpected relocation type %ld\n",
311 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
312 elf_lookup_fn lookup)
315 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
319 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
320 int type, elf_lookup_fn lookup)
323 return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
327 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
328 int type, elf_lookup_fn lookup)
331 return (elf_reloc_internal(lf, relocbase, data, type, true, lookup));
335 elf_cpu_load_file(linker_file_t lf __unused)
342 elf_cpu_unload_file(linker_file_t lf __unused)
349 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)