2 * Copyright (c) 2014, 2015 The FreeBSD Foundation.
3 * Copyright (c) 2014 Andrew Turner.
6 * This software was developed by Andrew Turner under
7 * sponsorship from the FreeBSD Foundation.
9 * Portions of this software were developed by Konstantin Belousov
10 * under sponsorship from the FreeBSD Foundation.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/systm.h>
41 #include <sys/imgact.h>
42 #include <sys/linker.h>
44 #include <sys/sysent.h>
45 #include <sys/imgact_elf.h>
46 #include <sys/syscall.h>
47 #include <sys/signalvar.h>
48 #include <sys/vnode.h>
51 #include <vm/vm_param.h>
53 #include <machine/elf.h>
54 #include <machine/md_var.h>
56 #include "linker_if.h"
58 u_long __read_frequently elf_hwcap;
59 u_long __read_frequently elf_hwcap2;
61 static struct sysentvec elf64_freebsd_sysvec = {
62 .sv_size = SYS_MAXSYSCALL,
65 .sv_fixup = __elfN(freebsd_fixup),
66 .sv_sendsig = sendsig,
67 .sv_sigcode = sigcode,
68 .sv_szsigcode = &szsigcode,
69 .sv_name = "FreeBSD ELF64",
70 .sv_coredump = __elfN(coredump),
71 .sv_imgact_try = NULL,
72 .sv_minsigstksz = MINSIGSTKSZ,
73 .sv_minuser = VM_MIN_ADDRESS,
74 .sv_maxuser = VM_MAXUSER_ADDRESS,
75 .sv_usrstack = USRSTACK,
76 .sv_psstrings = PS_STRINGS,
77 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
78 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
79 .sv_copyout_strings = exec_copyout_strings,
80 .sv_setregs = exec_setregs,
83 .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 |
84 SV_ASLR | SV_RNG_SEED_VER,
85 .sv_set_syscall_retval = cpu_set_syscall_retval,
86 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
87 .sv_syscallnames = syscallnames,
88 .sv_shared_page_base = SHAREDPAGE,
89 .sv_shared_page_len = PAGE_SIZE,
91 .sv_thread_detach = NULL,
93 .sv_hwcap = &elf_hwcap,
94 .sv_hwcap2 = &elf_hwcap2,
96 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
98 static Elf64_Brandinfo freebsd_brand_info = {
99 .brand = ELFOSABI_FREEBSD,
100 .machine = EM_AARCH64,
101 .compat_3_brand = "FreeBSD",
103 .interp_path = "/libexec/ld-elf.so.1",
104 .sysvec = &elf64_freebsd_sysvec,
105 .interp_newpath = NULL,
106 .brand_note = &elf64_freebsd_brandnote,
107 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
111 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
114 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
115 size_t *off __unused)
121 elf_is_ifunc_reloc(Elf_Size r_info __unused)
124 return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE);
128 reloc_instr_imm(Elf32_Addr *where, Elf_Addr val, u_int msb, u_int lsb)
131 /* Check bounds: upper bits must be all ones or all zeros. */
132 if ((uint64_t)((int64_t)val >> (msb + 1)) + 1 > 1)
135 val &= (1 << (msb - lsb + 1)) - 1;
136 *where |= (Elf32_Addr)val;
141 * Process a relocation. Support for some static relocations is required
142 * in order for the -zifunc-noplt optimization to work.
145 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
146 int type, int flags, elf_lookup_fn lookup)
148 #define ARM64_ELF_RELOC_LOCAL (1 << 0)
149 #define ARM64_ELF_RELOC_LATE_IFUNC (1 << 1)
150 Elf_Addr *where, addr, addend, val;
151 Elf_Word rtype, symidx;
153 const Elf_Rela *rela;
158 rel = (const Elf_Rel *)data;
159 where = (Elf_Addr *) (relocbase + rel->r_offset);
161 rtype = ELF_R_TYPE(rel->r_info);
162 symidx = ELF_R_SYM(rel->r_info);
165 rela = (const Elf_Rela *)data;
166 where = (Elf_Addr *) (relocbase + rela->r_offset);
167 addend = rela->r_addend;
168 rtype = ELF_R_TYPE(rela->r_info);
169 symidx = ELF_R_SYM(rela->r_info);
172 panic("unknown reloc type %d\n", type);
175 if ((flags & ARM64_ELF_RELOC_LATE_IFUNC) != 0) {
176 KASSERT(type == ELF_RELOC_RELA,
177 ("Only RELA ifunc relocations are supported"));
178 if (rtype != R_AARCH64_IRELATIVE)
182 if ((flags & ARM64_ELF_RELOC_LOCAL) != 0) {
183 if (rtype == R_AARCH64_RELATIVE)
184 *where = elf_relocaddr(lf, relocbase + addend);
191 case R_AARCH64_RELATIVE:
193 case R_AARCH64_TSTBR14:
194 error = lookup(lf, symidx, 1, &addr);
197 error = reloc_instr_imm((Elf32_Addr *)where,
198 addr + addend - (Elf_Addr)where, 15, 2);
200 case R_AARCH64_CONDBR19:
201 error = lookup(lf, symidx, 1, &addr);
204 error = reloc_instr_imm((Elf32_Addr *)where,
205 addr + addend - (Elf_Addr)where, 20, 2);
207 case R_AARCH64_JUMP26:
208 case R_AARCH64_CALL26:
209 error = lookup(lf, symidx, 1, &addr);
212 error = reloc_instr_imm((Elf32_Addr *)where,
213 addr + addend - (Elf_Addr)where, 27, 2);
215 case R_AARCH64_ABS64:
216 case R_AARCH64_GLOB_DAT:
217 case R_AARCH64_JUMP_SLOT:
218 error = lookup(lf, symidx, 1, &addr);
221 *where = addr + addend;
223 case R_AARCH64_IRELATIVE:
224 addr = relocbase + addend;
225 val = ((Elf64_Addr (*)(void))addr)();
230 printf("kldload: unexpected relocation type %d, "
231 "symbol index %d\n", rtype, symidx);
238 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
239 int type, elf_lookup_fn lookup)
242 return (elf_reloc_internal(lf, relocbase, data, type,
243 ARM64_ELF_RELOC_LOCAL, lookup));
246 /* Process one elf relocation with addend. */
248 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
249 elf_lookup_fn lookup)
252 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
256 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
257 int type, elf_lookup_fn lookup)
260 return (elf_reloc_internal(lf, relocbase, data, type,
261 ARM64_ELF_RELOC_LATE_IFUNC, lookup));
265 elf_cpu_load_file(linker_file_t lf)
269 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size);
274 elf_cpu_unload_file(linker_file_t lf __unused)
281 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)