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,
61 .sv_fixup = __elfN(freebsd_fixup),
62 .sv_sendsig = sendsig,
63 .sv_sigcode = sigcode,
64 .sv_szsigcode = &szsigcode,
65 .sv_name = "FreeBSD ELF32",
66 .sv_coredump = __elfN(coredump),
67 .sv_imgact_try = NULL,
68 .sv_minsigstksz = MINSIGSTKSZ,
69 .sv_minuser = VM_MIN_ADDRESS,
70 .sv_maxuser = VM_MAXUSER_ADDRESS,
71 .sv_usrstack = USRSTACK,
72 .sv_psstrings = PS_STRINGS,
73 .sv_stackprot = VM_PROT_ALL,
74 .sv_copyout_strings = exec_copyout_strings,
75 .sv_setregs = exec_setregs,
78 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
80 .sv_set_syscall_retval = cpu_set_syscall_retval,
81 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
82 .sv_syscallnames = syscallnames,
83 .sv_shared_page_base = SHAREDPAGE,
84 .sv_shared_page_len = PAGE_SIZE,
86 .sv_thread_detach = NULL,
89 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
91 static Elf32_Brandinfo freebsd_brand_info = {
92 .brand = ELFOSABI_FREEBSD,
94 .compat_3_brand = "FreeBSD",
96 .interp_path = "/libexec/ld-elf.so.1",
97 .sysvec = &elf32_freebsd_sysvec,
98 .interp_newpath = NULL,
99 .brand_note = &elf32_freebsd_brandnote,
100 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
103 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
104 (sysinit_cfunc_t) elf32_insert_brand_entry,
105 &freebsd_brand_info);
107 static Elf32_Brandinfo freebsd_brand_oinfo = {
108 .brand = ELFOSABI_FREEBSD,
110 .compat_3_brand = "FreeBSD",
112 .interp_path = "/usr/libexec/ld-elf.so.1",
113 .sysvec = &elf32_freebsd_sysvec,
114 .interp_newpath = NULL,
115 .brand_note = &elf32_freebsd_brandnote,
116 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
119 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
120 (sysinit_cfunc_t) elf32_insert_brand_entry,
121 &freebsd_brand_oinfo);
123 static Elf32_Brandinfo kfreebsd_brand_info = {
124 .brand = ELFOSABI_FREEBSD,
126 .compat_3_brand = "FreeBSD",
128 .interp_path = "/lib/ld.so.1",
129 .sysvec = &elf32_freebsd_sysvec,
130 .interp_newpath = NULL,
131 .brand_note = &elf32_kfreebsd_brandnote,
132 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
135 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
136 (sysinit_cfunc_t) elf32_insert_brand_entry,
137 &kfreebsd_brand_info);
140 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
149 len += elf32_populate_note(NT_X86_XSTATE,
150 get_pcb_user_save_td(td), dst,
151 cpu_max_ext_state_size, &buf);
152 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
155 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
156 cpu_max_ext_state_size, NULL);
162 elf_is_ifunc_reloc(Elf_Size r_info)
165 return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
168 #define ERI_LOCAL 0x0001
170 /* Process one elf relocation with addend. */
172 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
173 int type, elf_lookup_fn lookup, int flags)
178 Elf_Word rtype, symidx;
180 const Elf_Rela *rela;
185 rel = (const Elf_Rel *)data;
186 where = (Elf_Addr *) (relocbase + rel->r_offset);
188 rtype = ELF_R_TYPE(rel->r_info);
189 symidx = ELF_R_SYM(rel->r_info);
192 rela = (const Elf_Rela *)data;
193 where = (Elf_Addr *) (relocbase + rela->r_offset);
194 addend = rela->r_addend;
195 rtype = ELF_R_TYPE(rela->r_info);
196 symidx = ELF_R_SYM(rela->r_info);
199 panic("unknown reloc type %d\n", type);
202 if ((flags & ERI_LOCAL) != 0) {
203 if (rtype == R_386_RELATIVE) { /* A + B */
204 addr = elf_relocaddr(lf, relocbase + addend);
213 case R_386_NONE: /* none */
216 case R_386_32: /* S + A */
217 error = lookup(lf, symidx, 1, &addr);
225 case R_386_PC32: /* S + A - P */
226 error = lookup(lf, symidx, 1, &addr);
229 addr += addend - (Elf_Addr)where;
234 case R_386_COPY: /* none */
236 * There shouldn't be copy relocations in kernel
239 printf("kldload: unexpected R_COPY relocation\n");
243 case R_386_GLOB_DAT: /* S */
244 error = lookup(lf, symidx, 1, &addr);
254 case R_386_IRELATIVE:
255 addr = relocbase + addend;
256 addr = ((Elf_Addr (*)(void))addr)();
261 printf("kldload: unexpected relocation type %d\n",
269 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
270 elf_lookup_fn lookup)
273 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
277 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
278 int type, elf_lookup_fn lookup)
281 return (elf_reloc_internal(lf, relocbase, data, type, lookup,
286 elf_cpu_load_file(linker_file_t lf __unused)
293 elf_cpu_unload_file(linker_file_t lf __unused)