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>
41 #include <sys/sysent.h>
42 #include <sys/imgact_elf.h>
43 #include <sys/syscall.h>
44 #include <sys/signalvar.h>
45 #include <sys/vnode.h>
49 #include <vm/vm_param.h>
51 #include <machine/elf.h>
52 #include <machine/md_var.h>
53 #include <machine/npx.h>
55 struct sysentvec elf32_freebsd_sysvec = {
56 .sv_size = SYS_MAXSYSCALL,
59 .sv_fixup = __elfN(freebsd_fixup),
60 .sv_sendsig = sendsig,
61 .sv_sigcode = sigcode,
62 .sv_szsigcode = &szsigcode,
63 .sv_name = "FreeBSD ELF32",
64 .sv_coredump = __elfN(coredump),
65 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
66 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
67 .sv_elf_core_prepare_notes = __elfN(prepare_notes),
68 .sv_imgact_try = NULL,
69 .sv_minsigstksz = MINSIGSTKSZ,
70 .sv_minuser = VM_MIN_ADDRESS,
71 .sv_maxuser = VM_MAXUSER_ADDRESS,
72 .sv_usrstack = USRSTACK,
73 .sv_psstrings = PS_STRINGS,
74 .sv_psstringssz = sizeof(struct ps_strings),
75 .sv_stackprot = VM_PROT_ALL,
76 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
77 .sv_copyout_strings = exec_copyout_strings,
78 .sv_setregs = exec_setregs,
81 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
82 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER,
83 .sv_set_syscall_retval = cpu_set_syscall_retval,
84 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
85 .sv_syscallnames = syscallnames,
86 .sv_shared_page_base = SHAREDPAGE,
87 .sv_shared_page_len = PAGE_SIZE,
89 .sv_thread_detach = NULL,
91 .sv_onexec_old = exec_onexec_old,
92 .sv_onexit = exit_onexit,
93 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
94 .sv_regset_end = SET_LIMIT(__elfN(regset)),
96 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
98 static Elf32_Brandinfo freebsd_brand_info = {
99 .brand = ELFOSABI_FREEBSD,
101 .compat_3_brand = "FreeBSD",
103 .interp_path = "/libexec/ld-elf.so.1",
104 .sysvec = &elf32_freebsd_sysvec,
105 .interp_newpath = NULL,
106 .brand_note = &elf32_freebsd_brandnote,
107 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
111 (sysinit_cfunc_t) elf32_insert_brand_entry,
112 &freebsd_brand_info);
114 static Elf32_Brandinfo freebsd_brand_oinfo = {
115 .brand = ELFOSABI_FREEBSD,
117 .compat_3_brand = "FreeBSD",
119 .interp_path = "/usr/libexec/ld-elf.so.1",
120 .sysvec = &elf32_freebsd_sysvec,
121 .interp_newpath = NULL,
122 .brand_note = &elf32_freebsd_brandnote,
123 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
126 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
127 (sysinit_cfunc_t) elf32_insert_brand_entry,
128 &freebsd_brand_oinfo);
130 static Elf32_Brandinfo kfreebsd_brand_info = {
131 .brand = ELFOSABI_FREEBSD,
133 .compat_3_brand = "FreeBSD",
135 .interp_path = "/lib/ld.so.1",
136 .sysvec = &elf32_freebsd_sysvec,
137 .interp_newpath = NULL,
138 .brand_note = &elf32_kfreebsd_brandnote,
139 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
142 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
143 (sysinit_cfunc_t) elf32_insert_brand_entry,
144 &kfreebsd_brand_info);
147 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
156 len += elf32_populate_note(NT_X86_XSTATE,
157 get_pcb_user_save_td(td), dst,
158 cpu_max_ext_state_size, &buf);
159 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
162 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
163 cpu_max_ext_state_size, NULL);
169 elf_is_ifunc_reloc(Elf_Size r_info)
172 return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
175 #define ERI_LOCAL 0x0001
177 /* Process one elf relocation with addend. */
179 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
180 int type, elf_lookup_fn lookup, int flags)
185 Elf_Word rtype, symidx;
187 const Elf_Rela *rela;
192 rel = (const Elf_Rel *)data;
193 where = (Elf_Addr *) (relocbase + rel->r_offset);
195 rtype = ELF_R_TYPE(rel->r_info);
196 symidx = ELF_R_SYM(rel->r_info);
199 rela = (const Elf_Rela *)data;
200 where = (Elf_Addr *) (relocbase + rela->r_offset);
201 addend = rela->r_addend;
202 rtype = ELF_R_TYPE(rela->r_info);
203 symidx = ELF_R_SYM(rela->r_info);
206 panic("unknown reloc type %d\n", type);
209 if ((flags & ERI_LOCAL) != 0) {
210 if (rtype == R_386_RELATIVE) { /* A + B */
211 addr = elf_relocaddr(lf, relocbase + addend);
219 case R_386_NONE: /* none */
222 case R_386_32: /* S + A */
223 error = lookup(lf, symidx, 1, &addr);
231 case R_386_PC32: /* S + A - P */
232 error = lookup(lf, symidx, 1, &addr);
235 addr += addend - (Elf_Addr)where;
240 case R_386_COPY: /* none */
242 * There shouldn't be copy relocations in kernel
245 printf("kldload: unexpected R_COPY relocation, "
246 "symbol index %d\n", symidx);
250 case R_386_GLOB_DAT: /* S */
251 error = lookup(lf, symidx, 1, &addr);
261 case R_386_IRELATIVE:
262 addr = relocbase + addend;
263 addr = ((Elf_Addr (*)(void))addr)();
269 printf("kldload: unexpected relocation type %d, "
270 "symbol index %d\n", rtype, symidx);
277 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
278 elf_lookup_fn lookup)
281 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
285 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
286 int type, elf_lookup_fn lookup)
289 return (elf_reloc_internal(lf, relocbase, data, type, lookup,
294 elf_cpu_load_file(linker_file_t lf __unused)
301 elf_cpu_unload_file(linker_file_t lf __unused)
308 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)