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("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
37 #include <sys/imgact.h>
38 #include <sys/linker.h>
40 #include <sys/sysent.h>
41 #include <sys/imgact_elf.h>
42 #include <sys/syscall.h>
43 #include <sys/signalvar.h>
44 #include <sys/vnode.h>
48 #include <vm/vm_param.h>
50 #include <machine/elf.h>
51 #include <machine/md_var.h>
52 #include <machine/npx.h>
54 struct sysentvec elf32_freebsd_sysvec = {
55 .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 ELF32",
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_IA32 | SV_ILP32 |
77 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER,
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,
87 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
89 static Elf32_Brandinfo freebsd_brand_info = {
90 .brand = ELFOSABI_FREEBSD,
92 .compat_3_brand = "FreeBSD",
94 .interp_path = "/libexec/ld-elf.so.1",
95 .sysvec = &elf32_freebsd_sysvec,
96 .interp_newpath = NULL,
97 .brand_note = &elf32_freebsd_brandnote,
98 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
101 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
102 (sysinit_cfunc_t) elf32_insert_brand_entry,
103 &freebsd_brand_info);
105 static Elf32_Brandinfo freebsd_brand_oinfo = {
106 .brand = ELFOSABI_FREEBSD,
108 .compat_3_brand = "FreeBSD",
110 .interp_path = "/usr/libexec/ld-elf.so.1",
111 .sysvec = &elf32_freebsd_sysvec,
112 .interp_newpath = NULL,
113 .brand_note = &elf32_freebsd_brandnote,
114 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
117 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
118 (sysinit_cfunc_t) elf32_insert_brand_entry,
119 &freebsd_brand_oinfo);
121 static Elf32_Brandinfo kfreebsd_brand_info = {
122 .brand = ELFOSABI_FREEBSD,
124 .compat_3_brand = "FreeBSD",
126 .interp_path = "/lib/ld.so.1",
127 .sysvec = &elf32_freebsd_sysvec,
128 .interp_newpath = NULL,
129 .brand_note = &elf32_kfreebsd_brandnote,
130 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
133 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
134 (sysinit_cfunc_t) elf32_insert_brand_entry,
135 &kfreebsd_brand_info);
138 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
147 len += elf32_populate_note(NT_X86_XSTATE,
148 get_pcb_user_save_td(td), dst,
149 cpu_max_ext_state_size, &buf);
150 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
153 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
154 cpu_max_ext_state_size, NULL);
160 elf_is_ifunc_reloc(Elf_Size r_info)
163 return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
166 #define ERI_LOCAL 0x0001
168 /* Process one elf relocation with addend. */
170 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
171 int type, elf_lookup_fn lookup, int flags)
176 Elf_Word rtype, symidx;
178 const Elf_Rela *rela;
183 rel = (const Elf_Rel *)data;
184 where = (Elf_Addr *) (relocbase + rel->r_offset);
186 rtype = ELF_R_TYPE(rel->r_info);
187 symidx = ELF_R_SYM(rel->r_info);
190 rela = (const Elf_Rela *)data;
191 where = (Elf_Addr *) (relocbase + rela->r_offset);
192 addend = rela->r_addend;
193 rtype = ELF_R_TYPE(rela->r_info);
194 symidx = ELF_R_SYM(rela->r_info);
197 panic("unknown reloc type %d\n", type);
200 if ((flags & ERI_LOCAL) != 0) {
201 if (rtype == R_386_RELATIVE) { /* A + B */
202 addr = elf_relocaddr(lf, relocbase + addend);
210 case R_386_NONE: /* none */
213 case R_386_32: /* S + A */
214 error = lookup(lf, symidx, 1, &addr);
222 case R_386_PC32: /* S + A - P */
223 error = lookup(lf, symidx, 1, &addr);
226 addr += addend - (Elf_Addr)where;
231 case R_386_COPY: /* none */
233 * There shouldn't be copy relocations in kernel
236 printf("kldload: unexpected R_COPY relocation, "
237 "symbol index %d\n", symidx);
241 case R_386_GLOB_DAT: /* S */
242 error = lookup(lf, symidx, 1, &addr);
252 case R_386_IRELATIVE:
253 addr = relocbase + addend;
254 addr = ((Elf_Addr (*)(void))addr)();
259 printf("kldload: unexpected relocation type %d, "
260 "symbol index %d\n", rtype, symidx);
267 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
268 elf_lookup_fn lookup)
271 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
275 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
276 int type, elf_lookup_fn lookup)
279 return (elf_reloc_internal(lf, relocbase, data, type, lookup,
284 elf_cpu_load_file(linker_file_t lf __unused)
291 elf_cpu_unload_file(linker_file_t lf __unused)
298 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)