1 /*- 2 * Copyright 1996-1998 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/exec.h> 33 #include <sys/imgact.h> 34 #include <sys/linker.h> 35 #include <sys/sysent.h> 36 #include <sys/imgact_elf.h> 37 #include <sys/syscall.h> 38 #include <sys/signalvar.h> 39 #include <sys/vnode.h> 40 41 #include <vm/vm.h> 42 #include <vm/pmap.h> 43 #include <vm/vm_param.h> 44 45 #include <machine/elf.h> 46 #include <machine/md_var.h> 47 48 struct sysentvec elf32_freebsd_sysvec = { 49 .sv_size = SYS_MAXSYSCALL, 50 .sv_table = sysent, 51 .sv_mask = 0, 52 .sv_sigsize = 0, 53 .sv_sigtbl = NULL, 54 .sv_errsize = 0, 55 .sv_errtbl = NULL, 56 .sv_transtrap = NULL, 57 .sv_fixup = __elfN(freebsd_fixup), 58 .sv_sendsig = sendsig, 59 .sv_sigcode = sigcode, 60 .sv_szsigcode = &szsigcode, 61 .sv_prepsyscall = NULL, 62 .sv_name = "FreeBSD ELF32", 63 .sv_coredump = __elfN(coredump), 64 .sv_imgact_try = NULL, 65 .sv_minsigstksz = MINSIGSTKSZ, 66 .sv_pagesize = PAGE_SIZE, 67 .sv_minuser = VM_MIN_ADDRESS, 68 .sv_maxuser = VM_MAXUSER_ADDRESS, 69 .sv_usrstack = USRSTACK, 70 .sv_psstrings = PS_STRINGS, 71 .sv_stackprot = VM_PROT_ALL, 72 .sv_copyout_strings = exec_copyout_strings, 73 .sv_setregs = exec_setregs, 74 .sv_fixlimit = NULL, 75 .sv_maxssiz = NULL, 76 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 77 }; 78 79 static Elf32_Brandinfo freebsd_brand_info = { 80 .brand = ELFOSABI_FREEBSD, 81 .machine = EM_ARM, 82 .compat_3_brand = "FreeBSD", 83 .emul_path = NULL, 84 .interp_path = "/libexec/ld-elf.so.1", 85 .sysvec = &elf32_freebsd_sysvec, 86 .interp_newpath = NULL, 87 .flags = BI_CAN_EXEC_DYN, 88 }; 89 90 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY, 91 (sysinit_cfunc_t) elf32_insert_brand_entry, 92 &freebsd_brand_info); 93 94 static Elf32_Brandinfo freebsd_brand_oinfo = { 95 .brand = ELFOSABI_FREEBSD, 96 .machine = EM_ARM, 97 .compat_3_brand = "FreeBSD", 98 .emul_path = NULL, 99 .interp_path = "/usr/libexec/ld-elf.so.1", 100 .sysvec = &elf32_freebsd_sysvec, 101 .interp_newpath = NULL, 102 .flags = BI_CAN_EXEC_DYN, 103 }; 104 105 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY, 106 (sysinit_cfunc_t) elf32_insert_brand_entry, 107 &freebsd_brand_oinfo); 108 109 110 void 111 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 112 size_t *off __unused) 113 { 114 } 115 116 117 /* Process one elf relocation with addend. */ 118 static int 119 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 120 int type, int local, elf_lookup_fn lookup) 121 { 122 Elf_Addr *where; 123 Elf_Addr addr; 124 Elf_Addr addend; 125 Elf_Word rtype, symidx; 126 const Elf_Rel *rel; 127 const Elf_Rela *rela; 128 129 switch (type) { 130 case ELF_RELOC_REL: 131 rel = (const Elf_Rel *)data; 132 where = (Elf_Addr *) (relocbase + rel->r_offset); 133 addend = *where; 134 rtype = ELF_R_TYPE(rel->r_info); 135 symidx = ELF_R_SYM(rel->r_info); 136 break; 137 case ELF_RELOC_RELA: 138 rela = (const Elf_Rela *)data; 139 where = (Elf_Addr *) (relocbase + rela->r_offset); 140 addend = rela->r_addend; 141 rtype = ELF_R_TYPE(rela->r_info); 142 symidx = ELF_R_SYM(rela->r_info); 143 break; 144 default: 145 panic("unknown reloc type %d\n", type); 146 } 147 148 if (local) { 149 if (rtype == R_ARM_RELATIVE) { /* A + B */ 150 addr = relocbase + addend; 151 if (*where != addr) 152 *where = addr; 153 } 154 return (0); 155 } 156 157 switch (rtype) { 158 159 case R_ARM_NONE: /* none */ 160 break; 161 162 case R_ARM_ABS32: 163 addr = lookup(lf, symidx, 1); 164 if (addr == 0) 165 return -1; 166 if (*where != addr) 167 *where = addr; 168 169 break; 170 171 case R_ARM_COPY: /* none */ 172 /* 173 * There shouldn't be copy relocations in kernel 174 * objects. 175 */ 176 printf("kldload: unexpected R_COPY relocation\n"); 177 return -1; 178 break; 179 180 case R_ARM_JUMP_SLOT: 181 addr = lookup(lf, symidx, 1); 182 if (addr) { 183 *where = addr; 184 return (0); 185 } 186 return (-1); 187 case R_ARM_RELATIVE: 188 break; 189 190 default: 191 printf("kldload: unexpected relocation type %d\n", 192 rtype); 193 return -1; 194 } 195 return(0); 196 } 197 198 int 199 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 200 elf_lookup_fn lookup) 201 { 202 203 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 204 } 205 206 int 207 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 208 int type, elf_lookup_fn lookup) 209 { 210 211 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 212 } 213 214 int 215 elf_cpu_load_file(linker_file_t lf __unused) 216 { 217 218 cpu_idcache_wbinv_all(); 219 cpu_l2cache_wbinv_all(); 220 cpu_tlb_flushID(); 221 return (0); 222 } 223 224 int 225 elf_cpu_unload_file(linker_file_t lf __unused) 226 { 227 228 return (0); 229 } 230