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/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
38 #include <sys/imgact.h>
39 #include <sys/linker.h>
42 #include <sys/sysent.h>
43 #include <sys/imgact_elf.h>
44 #include <sys/syscall.h>
45 #include <sys/signalvar.h>
46 #include <sys/vnode.h>
49 #include <vm/vm_param.h>
51 #include <machine/elf.h>
52 #include <machine/md_var.h>
54 #include "linker_if.h"
56 u_long __read_frequently elf_hwcap;
57 u_long __read_frequently elf_hwcap2;
58 /* TODO: Move to a better location */
59 u_long __read_frequently linux_elf_hwcap;
60 u_long __read_frequently linux_elf_hwcap2;
62 struct arm64_addr_mask elf64_addr_mask;
64 static struct sysentvec elf64_freebsd_sysvec = {
65 .sv_size = SYS_MAXSYSCALL,
67 .sv_fixup = __elfN(freebsd_fixup),
68 .sv_sendsig = sendsig,
69 .sv_sigcode = sigcode,
70 .sv_szsigcode = &szsigcode,
71 .sv_name = "FreeBSD ELF64",
72 .sv_coredump = __elfN(coredump),
73 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
74 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
75 .sv_elf_core_prepare_notes = __elfN(prepare_notes),
76 .sv_minsigstksz = MINSIGSTKSZ,
77 .sv_minuser = VM_MIN_ADDRESS,
78 .sv_maxuser = VM_MAXUSER_ADDRESS,
79 .sv_usrstack = USRSTACK,
80 .sv_psstrings = PS_STRINGS,
81 .sv_psstringssz = sizeof(struct ps_strings),
82 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
83 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
84 .sv_copyout_strings = exec_copyout_strings,
85 .sv_setregs = exec_setregs,
88 .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 |
89 SV_ASLR | SV_RNG_SEED_VER | SV_SIGSYS,
90 .sv_set_syscall_retval = cpu_set_syscall_retval,
91 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
92 .sv_syscallnames = syscallnames,
93 .sv_shared_page_base = SHAREDPAGE,
94 .sv_shared_page_len = PAGE_SIZE,
96 .sv_thread_detach = NULL,
98 .sv_hwcap = &elf_hwcap,
99 .sv_hwcap2 = &elf_hwcap2,
100 .sv_onexec_old = exec_onexec_old,
101 .sv_onexit = exit_onexit,
102 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
103 .sv_regset_end = SET_LIMIT(__elfN(regset)),
105 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
107 static Elf64_Brandinfo freebsd_brand_info = {
108 .brand = ELFOSABI_FREEBSD,
109 .machine = EM_AARCH64,
110 .compat_3_brand = "FreeBSD",
111 .interp_path = "/libexec/ld-elf.so.1",
112 .sysvec = &elf64_freebsd_sysvec,
113 .interp_newpath = NULL,
114 .brand_note = &elf64_freebsd_brandnote,
115 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
118 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
119 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
122 get_arm64_addr_mask(struct regset *rs, struct thread *td, void *buf,
126 KASSERT(*sizep == sizeof(elf64_addr_mask),
127 ("%s: invalid size", __func__));
128 memcpy(buf, &elf64_addr_mask, sizeof(elf64_addr_mask));
130 *sizep = sizeof(elf64_addr_mask);
135 static struct regset regset_arm64_addr_mask = {
136 .note = NT_ARM_ADDR_MASK,
137 .size = sizeof(struct arm64_addr_mask),
138 .get = get_arm64_addr_mask,
140 ELF_REGSET(regset_arm64_addr_mask);
143 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
144 size_t *off __unused)
149 elf_is_ifunc_reloc(Elf_Size r_info __unused)
152 return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE);
156 reloc_instr_imm(Elf32_Addr *where, Elf_Addr val, u_int msb, u_int lsb)
159 /* Check bounds: upper bits must be all ones or all zeros. */
160 if ((uint64_t)((int64_t)val >> (msb + 1)) + 1 > 1)
163 val &= (1 << (msb - lsb + 1)) - 1;
164 *where |= (Elf32_Addr)val;
169 * Process a relocation. Support for some static relocations is required
170 * in order for the -zifunc-noplt optimization to work.
173 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
174 int type, int flags, elf_lookup_fn lookup)
176 #define ARM64_ELF_RELOC_LOCAL (1 << 0)
177 #define ARM64_ELF_RELOC_LATE_IFUNC (1 << 1)
178 Elf_Addr *where, addr, addend, val;
179 Elf_Word rtype, symidx;
181 const Elf_Rela *rela;
186 rel = (const Elf_Rel *)data;
187 where = (Elf_Addr *) (relocbase + rel->r_offset);
189 rtype = ELF_R_TYPE(rel->r_info);
190 symidx = ELF_R_SYM(rel->r_info);
193 rela = (const Elf_Rela *)data;
194 where = (Elf_Addr *) (relocbase + rela->r_offset);
195 addend = rela->r_addend;
196 rtype = ELF_R_TYPE(rela->r_info);
197 symidx = ELF_R_SYM(rela->r_info);
200 panic("unknown reloc type %d\n", type);
203 if ((flags & ARM64_ELF_RELOC_LATE_IFUNC) != 0) {
204 KASSERT(type == ELF_RELOC_RELA,
205 ("Only RELA ifunc relocations are supported"));
206 if (rtype != R_AARCH64_IRELATIVE)
210 if ((flags & ARM64_ELF_RELOC_LOCAL) != 0) {
211 if (rtype == R_AARCH64_RELATIVE)
212 *where = elf_relocaddr(lf, relocbase + addend);
219 case R_AARCH64_RELATIVE:
221 case R_AARCH64_TSTBR14:
222 error = lookup(lf, symidx, 1, &addr);
225 error = reloc_instr_imm((Elf32_Addr *)where,
226 addr + addend - (Elf_Addr)where, 15, 2);
228 case R_AARCH64_CONDBR19:
229 error = lookup(lf, symidx, 1, &addr);
232 error = reloc_instr_imm((Elf32_Addr *)where,
233 addr + addend - (Elf_Addr)where, 20, 2);
235 case R_AARCH64_JUMP26:
236 case R_AARCH64_CALL26:
237 error = lookup(lf, symidx, 1, &addr);
240 error = reloc_instr_imm((Elf32_Addr *)where,
241 addr + addend - (Elf_Addr)where, 27, 2);
243 case R_AARCH64_ABS64:
244 case R_AARCH64_GLOB_DAT:
245 case R_AARCH64_JUMP_SLOT:
246 error = lookup(lf, symidx, 1, &addr);
249 *where = addr + addend;
251 case R_AARCH64_IRELATIVE:
252 addr = relocbase + addend;
253 val = ((Elf64_Addr (*)(void))addr)();
258 printf("kldload: unexpected relocation type %d, "
259 "symbol index %d\n", rtype, symidx);
266 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
267 int type, elf_lookup_fn lookup)
270 return (elf_reloc_internal(lf, relocbase, data, type,
271 ARM64_ELF_RELOC_LOCAL, lookup));
274 /* Process one elf relocation with addend. */
276 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
277 elf_lookup_fn lookup)
280 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
284 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
285 int type, elf_lookup_fn lookup)
288 return (elf_reloc_internal(lf, relocbase, data, type,
289 ARM64_ELF_RELOC_LATE_IFUNC, lookup));
293 elf_cpu_load_file(linker_file_t lf)
297 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size);
302 elf_cpu_unload_file(linker_file_t lf __unused)
309 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)