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 elf_hwcap; 59 60 static struct sysentvec elf64_freebsd_sysvec = { 61 .sv_size = SYS_MAXSYSCALL, 62 .sv_table = sysent, 63 .sv_errsize = 0, 64 .sv_errtbl = NULL, 65 .sv_transtrap = NULL, 66 .sv_fixup = __elfN(freebsd_fixup), 67 .sv_sendsig = sendsig, 68 .sv_sigcode = sigcode, 69 .sv_szsigcode = &szsigcode, 70 .sv_name = "FreeBSD ELF64", 71 .sv_coredump = __elfN(coredump), 72 .sv_imgact_try = NULL, 73 .sv_minsigstksz = MINSIGSTKSZ, 74 .sv_minuser = VM_MIN_ADDRESS, 75 .sv_maxuser = VM_MAXUSER_ADDRESS, 76 .sv_usrstack = USRSTACK, 77 .sv_psstrings = PS_STRINGS, 78 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 79 .sv_copyout_strings = exec_copyout_strings, 80 .sv_setregs = exec_setregs, 81 .sv_fixlimit = NULL, 82 .sv_maxssiz = NULL, 83 .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 | 84 SV_ASLR, 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, 90 .sv_schedtail = NULL, 91 .sv_thread_detach = NULL, 92 .sv_trap = NULL, 93 .sv_hwcap = &elf_hwcap, 94 }; 95 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 96 97 static Elf64_Brandinfo freebsd_brand_info = { 98 .brand = ELFOSABI_FREEBSD, 99 .machine = EM_AARCH64, 100 .compat_3_brand = "FreeBSD", 101 .emul_path = NULL, 102 .interp_path = "/libexec/ld-elf.so.1", 103 .sysvec = &elf64_freebsd_sysvec, 104 .interp_newpath = NULL, 105 .brand_note = &elf64_freebsd_brandnote, 106 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 107 }; 108 109 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 110 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info); 111 112 void 113 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 114 size_t *off __unused) 115 { 116 117 } 118 119 bool 120 elf_is_ifunc_reloc(Elf_Size r_info __unused) 121 { 122 123 return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE); 124 } 125 126 static int 127 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 128 int type, int local, elf_lookup_fn lookup) 129 { 130 Elf_Addr *where, addr, addend, val; 131 Elf_Word rtype, symidx; 132 const Elf_Rel *rel; 133 const Elf_Rela *rela; 134 int error; 135 136 switch (type) { 137 case ELF_RELOC_REL: 138 rel = (const Elf_Rel *)data; 139 where = (Elf_Addr *) (relocbase + rel->r_offset); 140 addend = *where; 141 rtype = ELF_R_TYPE(rel->r_info); 142 symidx = ELF_R_SYM(rel->r_info); 143 break; 144 case ELF_RELOC_RELA: 145 rela = (const Elf_Rela *)data; 146 where = (Elf_Addr *) (relocbase + rela->r_offset); 147 addend = rela->r_addend; 148 rtype = ELF_R_TYPE(rela->r_info); 149 symidx = ELF_R_SYM(rela->r_info); 150 break; 151 default: 152 panic("unknown reloc type %d\n", type); 153 } 154 155 if (local) { 156 if (rtype == R_AARCH64_RELATIVE) 157 *where = elf_relocaddr(lf, relocbase + addend); 158 return (0); 159 } 160 161 switch (rtype) { 162 case R_AARCH64_NONE: 163 case R_AARCH64_RELATIVE: 164 break; 165 case R_AARCH64_ABS64: 166 case R_AARCH64_GLOB_DAT: 167 case R_AARCH64_JUMP_SLOT: 168 error = lookup(lf, symidx, 1, &addr); 169 if (error != 0) 170 return (-1); 171 *where = addr + addend; 172 break; 173 case R_AARCH64_IRELATIVE: 174 addr = relocbase + addend; 175 val = ((Elf64_Addr (*)(void))addr)(); 176 if (*where != val) 177 *where = val; 178 break; 179 default: 180 printf("kldload: unexpected relocation type %d\n", rtype); 181 return (-1); 182 } 183 return (0); 184 } 185 186 int 187 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 188 int type, elf_lookup_fn lookup) 189 { 190 191 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 192 } 193 194 /* Process one elf relocation with addend. */ 195 int 196 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 197 elf_lookup_fn lookup) 198 { 199 200 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 201 } 202 203 int 204 elf_cpu_load_file(linker_file_t lf) 205 { 206 207 if (lf->id != 1) 208 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size); 209 return (0); 210 } 211 212 int 213 elf_cpu_unload_file(linker_file_t lf __unused) 214 { 215 216 return (0); 217 } 218