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 static struct sysentvec elf64_freebsd_sysvec = { 59 .sv_size = SYS_MAXSYSCALL, 60 .sv_table = sysent, 61 .sv_errsize = 0, 62 .sv_errtbl = NULL, 63 .sv_transtrap = NULL, 64 .sv_fixup = __elfN(freebsd_fixup), 65 .sv_sendsig = sendsig, 66 .sv_sigcode = sigcode, 67 .sv_szsigcode = &szsigcode, 68 .sv_name = "FreeBSD ELF64", 69 .sv_coredump = __elfN(coredump), 70 .sv_imgact_try = NULL, 71 .sv_minsigstksz = MINSIGSTKSZ, 72 .sv_pagesize = PAGE_SIZE, 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_strings = exec_copyout_strings, 79 .sv_setregs = exec_setregs, 80 .sv_fixlimit = NULL, 81 .sv_maxssiz = NULL, 82 .sv_flags = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64 | 83 SV_ASLR, 84 .sv_set_syscall_retval = cpu_set_syscall_retval, 85 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 86 .sv_syscallnames = syscallnames, 87 .sv_shared_page_base = SHAREDPAGE, 88 .sv_shared_page_len = PAGE_SIZE, 89 .sv_schedtail = NULL, 90 .sv_thread_detach = NULL, 91 .sv_trap = NULL, 92 }; 93 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec); 94 95 static Elf64_Brandinfo freebsd_brand_info = { 96 .brand = ELFOSABI_FREEBSD, 97 .machine = EM_AARCH64, 98 .compat_3_brand = "FreeBSD", 99 .emul_path = NULL, 100 .interp_path = "/libexec/ld-elf.so.1", 101 .sysvec = &elf64_freebsd_sysvec, 102 .interp_newpath = NULL, 103 .brand_note = &elf64_freebsd_brandnote, 104 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 105 }; 106 107 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 108 (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info); 109 110 void 111 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 112 size_t *off __unused) 113 { 114 115 } 116 117 bool 118 elf_is_ifunc_reloc(Elf_Size r_info __unused) 119 { 120 121 return (ELF_R_TYPE(r_info) == R_AARCH64_IRELATIVE); 122 } 123 124 static int 125 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 126 int type, int local, elf_lookup_fn lookup) 127 { 128 Elf_Addr *where, addr, addend, val; 129 Elf_Word rtype, symidx; 130 const Elf_Rel *rel; 131 const Elf_Rela *rela; 132 int error; 133 134 switch (type) { 135 case ELF_RELOC_REL: 136 rel = (const Elf_Rel *)data; 137 where = (Elf_Addr *) (relocbase + rel->r_offset); 138 addend = *where; 139 rtype = ELF_R_TYPE(rel->r_info); 140 symidx = ELF_R_SYM(rel->r_info); 141 break; 142 case ELF_RELOC_RELA: 143 rela = (const Elf_Rela *)data; 144 where = (Elf_Addr *) (relocbase + rela->r_offset); 145 addend = rela->r_addend; 146 rtype = ELF_R_TYPE(rela->r_info); 147 symidx = ELF_R_SYM(rela->r_info); 148 break; 149 default: 150 panic("unknown reloc type %d\n", type); 151 } 152 153 if (local) { 154 if (rtype == R_AARCH64_RELATIVE) 155 *where = elf_relocaddr(lf, relocbase + addend); 156 return (0); 157 } 158 159 switch (rtype) { 160 case R_AARCH64_NONE: 161 case R_AARCH64_RELATIVE: 162 break; 163 case R_AARCH64_ABS64: 164 case R_AARCH64_GLOB_DAT: 165 case R_AARCH64_JUMP_SLOT: 166 error = lookup(lf, symidx, 1, &addr); 167 if (error != 0) 168 return (-1); 169 *where = addr + addend; 170 break; 171 case R_AARCH64_IRELATIVE: 172 addr = relocbase + addend; 173 val = ((Elf64_Addr (*)(void))addr)(); 174 if (*where != val) 175 *where = val; 176 break; 177 default: 178 printf("kldload: unexpected relocation type %d\n", rtype); 179 return (-1); 180 } 181 return (0); 182 } 183 184 int 185 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 186 int type, elf_lookup_fn lookup) 187 { 188 189 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 190 } 191 192 /* Process one elf relocation with addend. */ 193 int 194 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 195 elf_lookup_fn lookup) 196 { 197 198 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 199 } 200 201 int 202 elf_cpu_load_file(linker_file_t lf) 203 { 204 205 if (lf->id != 1) 206 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size); 207 return (0); 208 } 209 210 int 211 elf_cpu_unload_file(linker_file_t lf __unused) 212 { 213 214 return (0); 215 } 216