Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/elf_machdep.c
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1 /*- 2 * Copyright (c) 2001 Jake Burkholder. 3 * Copyright (c) 2000 Eduardo Horvath. 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 * 38 * from: NetBSD: mdreloc.c,v 1.5 2001/04/25 12:24:51 kleink Exp 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/exec.h> 48 #include <sys/imgact.h> 49 #include <sys/linker.h> 50 #include <sys/sysent.h> 51 #include <sys/imgact_elf.h> 52 #include <sys/syscall.h> 53 #include <sys/signalvar.h> 54 #include <sys/vnode.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_param.h> 58 59 #include <machine/elf.h> 60 61 #include "linker_if.h" 62 63 static struct sysentvec elf64_freebsd_sysvec = { 64 SYS_MAXSYSCALL, 65 sysent, 66 0, 67 0, 68 NULL, 69 0, 70 NULL, 71 NULL, 72 __elfN(freebsd_fixup), 73 sendsig, 74 NULL, 75 NULL, 76 NULL, 77 "FreeBSD ELF64", 78 __elfN(coredump), 79 NULL, 80 MINSIGSTKSZ, 81 PAGE_SIZE, 82 VM_MIN_ADDRESS, 83 VM_MAXUSER_ADDRESS, 84 USRSTACK, 85 PS_STRINGS, 86 VM_PROT_READ | VM_PROT_WRITE, 87 exec_copyout_strings, 88 exec_setregs, 89 NULL 90 }; 91 92 static Elf64_Brandinfo freebsd_brand_info = { 93 ELFOSABI_FREEBSD, 94 EM_SPARCV9, 95 "FreeBSD", 96 NULL, 97 "/libexec/ld-elf.so.1", 98 &elf64_freebsd_sysvec, 99 NULL, 100 BI_CAN_EXEC_DYN, 101 }; 102 103 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY, 104 (sysinit_cfunc_t) elf64_insert_brand_entry, 105 &freebsd_brand_info); 106 107 static Elf64_Brandinfo freebsd_brand_oinfo = { 108 ELFOSABI_FREEBSD, 109 EM_SPARCV9, 110 "FreeBSD", 111 NULL, 112 "/usr/libexec/ld-elf.so.1", 113 &elf64_freebsd_sysvec, 114 NULL, 115 BI_CAN_EXEC_DYN, 116 }; 117 118 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 119 (sysinit_cfunc_t) elf64_insert_brand_entry, 120 &freebsd_brand_oinfo); 121 122 123 void 124 elf64_dump_thread(struct thread *td __unused, void *dst __unused, 125 size_t *off __unused) 126 { 127 } 128 129 130 /* 131 * The following table holds for each relocation type: 132 * - the width in bits of the memory location the relocation 133 * applies to (not currently used) 134 * - the number of bits the relocation value must be shifted to the 135 * right (i.e. discard least significant bits) to fit into 136 * the appropriate field in the instruction word. 137 * - flags indicating whether 138 * * the relocation involves a symbol 139 * * the relocation is relative to the current position 140 * * the relocation is for a GOT entry 141 * * the relocation is relative to the load address 142 * 143 */ 144 #define _RF_S 0x80000000 /* Resolve symbol */ 145 #define _RF_A 0x40000000 /* Use addend */ 146 #define _RF_P 0x20000000 /* Location relative */ 147 #define _RF_G 0x10000000 /* GOT offset */ 148 #define _RF_B 0x08000000 /* Load address relative */ 149 #define _RF_U 0x04000000 /* Unaligned */ 150 #define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ 151 #define _RF_RS(s) ( (s) & 0xff) /* right shift */ 152 static const int reloc_target_flags[] = { 153 0, /* NONE */ 154 _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */ 155 _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */ 156 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */ 157 _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */ 158 _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */ 159 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */ 160 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */ 161 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */ 162 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HI22 */ 163 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 22 */ 164 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 13 */ 165 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LO10 */ 166 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */ 167 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */ 168 _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */ 169 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */ 170 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */ 171 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */ 172 _RF_SZ(32) | _RF_RS(0), /* COPY */ 173 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* GLOB_DAT */ 174 _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */ 175 _RF_A| _RF_B| _RF_SZ(64) | _RF_RS(0), /* RELATIVE */ 176 _RF_S|_RF_A| _RF_U| _RF_SZ(32) | _RF_RS(0), /* UA_32 */ 177 178 _RF_A| _RF_SZ(32) | _RF_RS(0), /* PLT32 */ 179 _RF_A| _RF_SZ(32) | _RF_RS(10), /* HIPLT22 */ 180 _RF_A| _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ 181 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */ 182 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PCPLT22 */ 183 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT10 */ 184 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 10 */ 185 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 11 */ 186 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* 64 */ 187 _RF_S|_RF_A|/*extra*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */ 188 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(42), /* HH22 */ 189 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(32), /* HM10 */ 190 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* LM22 */ 191 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(42), /* PC_HH22 */ 192 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(32), /* PC_HM10 */ 193 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC_LM22 */ 194 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP16 */ 195 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP19 */ 196 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */ 197 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 7 */ 198 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 5 */ 199 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 6 */ 200 _RF_S|_RF_A|_RF_P| _RF_SZ(64) | _RF_RS(0), /* DISP64 */ 201 _RF_A| _RF_SZ(64) | _RF_RS(0), /* PLT64 */ 202 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HIX22 */ 203 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LOX10 */ 204 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(22), /* H44 */ 205 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(12), /* M44 */ 206 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* L44 */ 207 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* REGISTER */ 208 _RF_S|_RF_A| _RF_U| _RF_SZ(64) | _RF_RS(0), /* UA64 */ 209 _RF_S|_RF_A| _RF_U| _RF_SZ(16) | _RF_RS(0), /* UA16 */ 210 }; 211 212 #if 0 213 static const char *reloc_names[] = { 214 "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8", 215 "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22", 216 "22", "13", "LO10", "GOT10", "GOT13", 217 "GOT22", "PC10", "PC22", "WPLT30", "COPY", 218 "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32", 219 "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32", 220 "10", "11", "64", "OLO10", "HH22", 221 "HM10", "LM22", "PC_HH22", "PC_HM10", "PC_LM22", 222 "WDISP16", "WDISP19", "GLOB_JMP", "7", "5", "6", 223 "DISP64", "PLT64", "HIX22", "LOX10", "H44", "M44", 224 "L44", "REGISTER", "UA64", "UA16" 225 }; 226 #endif 227 228 #define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) 229 #define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) 230 #define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) 231 #define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) 232 #define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) 233 #define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) 234 #define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) 235 236 static const long reloc_target_bitmask[] = { 237 #define _BM(x) (~(-(1ULL << (x)))) 238 0, /* NONE */ 239 _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */ 240 _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */ 241 _BM(30), _BM(22), /* WDISP30, WDISP22 */ 242 _BM(22), _BM(22), /* HI22, _22 */ 243 _BM(13), _BM(10), /* RELOC_13, _LO10 */ 244 _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */ 245 _BM(10), _BM(22), /* _PC10, _PC22 */ 246 _BM(30), 0, /* _WPLT30, _COPY */ 247 _BM(32), _BM(32), _BM(32), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ 248 _BM(32), _BM(32), /* _UA32, PLT32 */ 249 _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */ 250 _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */ 251 _BM(10), _BM(11), -1, /* _10, _11, _64 */ 252 _BM(13), _BM(22), /* _OLO10, _HH22 */ 253 _BM(10), _BM(22), /* _HM10, _LM22 */ 254 _BM(22), _BM(10), _BM(22), /* _PC_HH22, _PC_HM10, _PC_LM22 */ 255 _BM(16), _BM(19), /* _WDISP16, _WDISP19 */ 256 -1, /* GLOB_JMP */ 257 _BM(7), _BM(5), _BM(6) /* _7, _5, _6 */ 258 -1, -1, /* DISP64, PLT64 */ 259 _BM(22), _BM(13), /* HIX22, LOX10 */ 260 _BM(22), _BM(10), _BM(13), /* H44, M44, L44 */ 261 -1, -1, _BM(16), /* REGISTER, UA64, UA16 */ 262 #undef _BM 263 }; 264 #define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) 265 266 int 267 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 268 int type, elf_lookup_fn lookup) 269 { 270 const Elf_Rela *rela; 271 Elf_Addr value; 272 Elf_Addr *where; 273 274 if (type != ELF_RELOC_RELA) 275 return (-1); 276 277 rela = (const Elf_Rela *)data; 278 if (ELF64_R_TYPE_ID(rela->r_info) != R_SPARC_RELATIVE) 279 return (-1); 280 281 value = rela->r_addend + (Elf_Addr)lf->address; 282 where = (Elf_Addr *)((Elf_Addr)lf->address + rela->r_offset); 283 284 *where = value; 285 286 return (0); 287 } 288 289 /* Process one elf relocation with addend. */ 290 int 291 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 292 elf_lookup_fn lookup) 293 { 294 const Elf_Rela *rela; 295 Elf_Word *where32; 296 Elf_Addr *where; 297 Elf_Size rtype, symidx; 298 Elf_Addr value; 299 Elf_Addr mask; 300 Elf_Addr addr; 301 302 if (type != ELF_RELOC_RELA) 303 return (-1); 304 305 rela = (const Elf_Rela *)data; 306 where = (Elf_Addr *)(relocbase + rela->r_offset); 307 where32 = (Elf_Word *)where; 308 rtype = ELF64_R_TYPE_ID(rela->r_info); 309 symidx = ELF_R_SYM(rela->r_info); 310 311 if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE) 312 return (0); 313 314 if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY || 315 rtype >= sizeof(reloc_target_bitmask) / 316 sizeof(*reloc_target_bitmask)) 317 return (-1); 318 319 if (RELOC_UNALIGNED(rtype)) 320 return (-1); 321 322 value = rela->r_addend; 323 324 if (RELOC_RESOLVE_SYMBOL(rtype)) { 325 addr = lookup(lf, symidx, 1); 326 if (addr == 0) 327 return (-1); 328 value += addr; 329 } 330 331 if (rtype == R_SPARC_OLO10) 332 value = (value & 0x3ff) + ELF64_R_TYPE_DATA(rela->r_info); 333 334 if (RELOC_PC_RELATIVE(rtype)) 335 value -= (Elf_Addr)where; 336 337 if (RELOC_BASE_RELATIVE(rtype)) 338 value += relocbase; 339 340 mask = RELOC_VALUE_BITMASK(rtype); 341 value >>= RELOC_VALUE_RIGHTSHIFT(rtype); 342 value &= mask; 343 344 if (RELOC_TARGET_SIZE(rtype) > 32) { 345 *where &= ~mask; 346 *where |= value; 347 } else { 348 *where32 &= ~mask; 349 *where32 |= value; 350 } 351 352 return (0); 353 } 354 355 int 356 elf_cpu_load_file(linker_file_t lf __unused) 357 { 358 359 return (0); 360 } 361 362 int 363 elf_cpu_unload_file(linker_file_t lf __unused) 364 { 365 366 return (0); 367 }
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