1 /*- 2 * Copyright (c) 2014, 2015 The FreeBSD Foundation. 3 * Copyright (c) 2014 Andrew Turner. 4 * All rights reserved. 5 * 6 * This software was developed by Andrew Turner under 7 * sponsorship from the FreeBSD Foundation. 8 * 9 * Portions of this software were developed by Konstantin Belousov 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 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. 20 * 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 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/systm.h> 40 #include <sys/exec.h> 41 #include <sys/imgact.h> 42 #include <sys/linker.h> 43 #include <sys/proc.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> 49 50 #include <vm/vm.h> 51 #include <vm/vm_param.h> 52 53 #include <machine/elf.h> 54 #include <machine/md_var.h> 55 56 #include "linker_if.h" 57 58 u_long __read_frequently elf_hwcap; 59 u_long __read_frequently elf_hwcap2; 60 61 static struct sysentvec elf64_freebsd_sysvec = { 62 .sv_size = SYS_MAXSYSCALL, 63 .sv_table = sysent, 64 .sv_transtrap = NULL, 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_elf_core_osabi = ELFOSABI_FREEBSD, 72 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 73 .sv_elf_core_prepare_notes = __elfN(prepare_notes), 74 .sv_imgact_try = NULL, 75 .sv_minsigstksz = MINSIGSTKSZ, 76 .sv_minuser = VM_MIN_ADDRESS, 77 .sv_maxuser = VM_MAXUSER_ADDRESS, 78 .sv_usrstack = USRSTACK, 79 .sv_psstrings = PS_STRINGS, 80 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 81 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs), 82 .sv_copyout_strings = exec_copyout_strings, 83 .sv_setregs = exec_setregs, 84 .sv_fixlimit = NULL, 85 .sv_maxssiz = NULL, 86 .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 | 87 SV_ASLR | SV_RNG_SEED_VER, 88 .sv_set_syscall_retval = cpu_set_syscall_retval, 89 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 90 .sv_syscallnames = syscallnames, 91 .sv_shared_page_base = SHAREDPAGE, 92 .sv_shared_page_len = PAGE_SIZE, 93 .sv_schedtail = NULL, 94 .sv_thread_detach = NULL, 95 .sv_trap = NULL, 96 .sv_hwcap = &elf_hwcap, 97 .sv_hwcap2 = &elf_hwcap2, 98 .sv_onexec_old = exec_onexec_old, 99 .sv_onexit = exit_onexit, 100 }; 101 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 102 103 static Elf64_Brandinfo freebsd_brand_info = { 104 .brand = ELFOSABI_FREEBSD, 105 .machine = EM_AARCH64, 106 .compat_3_brand = "FreeBSD", 107 .emul_path = NULL, 108 .interp_path = "/libexec/ld-elf.so.1", 109 .sysvec = &elf64_freebsd_sysvec, 110 .interp_newpath = NULL, 111 .brand_note = &elf64_freebsd_brandnote, 112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 113 }; 114 115 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 116 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info); 117 118 void 119 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 120 size_t *off __unused) 121 { 122 123 } 124 125 bool 126 elf_is_ifunc_reloc(Elf_Size r_info __unused) 127 { 128 129 return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE); 130 } 131 132 static int 133 reloc_instr_imm(Elf32_Addr *where, Elf_Addr val, u_int msb, u_int lsb) 134 { 135 136 /* Check bounds: upper bits must be all ones or all zeros. */ 137 if ((uint64_t)((int64_t)val >> (msb + 1)) + 1 > 1) 138 return (-1); 139 val >>= lsb; 140 val &= (1 << (msb - lsb + 1)) - 1; 141 *where |= (Elf32_Addr)val; 142 return (0); 143 } 144 145 /* 146 * Process a relocation. Support for some static relocations is required 147 * in order for the -zifunc-noplt optimization to work. 148 */ 149 static int 150 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 151 int type, int flags, elf_lookup_fn lookup) 152 { 153 #define ARM64_ELF_RELOC_LOCAL (1 << 0) 154 #define ARM64_ELF_RELOC_LATE_IFUNC (1 << 1) 155 Elf_Addr *where, addr, addend, val; 156 Elf_Word rtype, symidx; 157 const Elf_Rel *rel; 158 const Elf_Rela *rela; 159 int error; 160 161 switch (type) { 162 case ELF_RELOC_REL: 163 rel = (const Elf_Rel *)data; 164 where = (Elf_Addr *) (relocbase + rel->r_offset); 165 addend = *where; 166 rtype = ELF_R_TYPE(rel->r_info); 167 symidx = ELF_R_SYM(rel->r_info); 168 break; 169 case ELF_RELOC_RELA: 170 rela = (const Elf_Rela *)data; 171 where = (Elf_Addr *) (relocbase + rela->r_offset); 172 addend = rela->r_addend; 173 rtype = ELF_R_TYPE(rela->r_info); 174 symidx = ELF_R_SYM(rela->r_info); 175 break; 176 default: 177 panic("unknown reloc type %d\n", type); 178 } 179 180 if ((flags & ARM64_ELF_RELOC_LATE_IFUNC) != 0) { 181 KASSERT(type == ELF_RELOC_RELA, 182 ("Only RELA ifunc relocations are supported")); 183 if (rtype != R_AARCH64_IRELATIVE) 184 return (0); 185 } 186 187 if ((flags & ARM64_ELF_RELOC_LOCAL) != 0) { 188 if (rtype == R_AARCH64_RELATIVE) 189 *where = elf_relocaddr(lf, relocbase + addend); 190 return (0); 191 } 192 193 error = 0; 194 switch (rtype) { 195 case R_AARCH64_NONE: 196 case R_AARCH64_RELATIVE: 197 break; 198 case R_AARCH64_TSTBR14: 199 error = lookup(lf, symidx, 1, &addr); 200 if (error != 0) 201 return (-1); 202 error = reloc_instr_imm((Elf32_Addr *)where, 203 addr + addend - (Elf_Addr)where, 15, 2); 204 break; 205 case R_AARCH64_CONDBR19: 206 error = lookup(lf, symidx, 1, &addr); 207 if (error != 0) 208 return (-1); 209 error = reloc_instr_imm((Elf32_Addr *)where, 210 addr + addend - (Elf_Addr)where, 20, 2); 211 break; 212 case R_AARCH64_JUMP26: 213 case R_AARCH64_CALL26: 214 error = lookup(lf, symidx, 1, &addr); 215 if (error != 0) 216 return (-1); 217 error = reloc_instr_imm((Elf32_Addr *)where, 218 addr + addend - (Elf_Addr)where, 27, 2); 219 break; 220 case R_AARCH64_ABS64: 221 case R_AARCH64_GLOB_DAT: 222 case R_AARCH64_JUMP_SLOT: 223 error = lookup(lf, symidx, 1, &addr); 224 if (error != 0) 225 return (-1); 226 *where = addr + addend; 227 break; 228 case R_AARCH64_IRELATIVE: 229 addr = relocbase + addend; 230 val = ((Elf64_Addr (*)(void))addr)(); 231 if (*where != val) 232 *where = val; 233 break; 234 default: 235 printf("kldload: unexpected relocation type %d, " 236 "symbol index %d\n", rtype, symidx); 237 return (-1); 238 } 239 return (error); 240 } 241 242 int 243 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 244 int type, elf_lookup_fn lookup) 245 { 246 247 return (elf_reloc_internal(lf, relocbase, data, type, 248 ARM64_ELF_RELOC_LOCAL, lookup)); 249 } 250 251 /* Process one elf relocation with addend. */ 252 int 253 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 254 elf_lookup_fn lookup) 255 { 256 257 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 258 } 259 260 int 261 elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data, 262 int type, elf_lookup_fn lookup) 263 { 264 265 return (elf_reloc_internal(lf, relocbase, data, type, 266 ARM64_ELF_RELOC_LATE_IFUNC, lookup)); 267 } 268 269 int 270 elf_cpu_load_file(linker_file_t lf) 271 { 272 273 if (lf->id != 1) 274 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size); 275 return (0); 276 } 277 278 int 279 elf_cpu_unload_file(linker_file_t lf __unused) 280 { 281 282 return (0); 283 } 284 285 int 286 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused) 287 { 288 289 return (0); 290 } 291