elf_machdep.c revision 153504
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 * $FreeBSD: head/sys/sparc64/sparc64/elf_machdep.c 153504 2005-12-18 04:52:37Z marcel $ 40 */ 41 42#include <sys/param.h> 43#include <sys/kernel.h> 44#include <sys/systm.h> 45#include <sys/exec.h> 46#include <sys/imgact.h> 47#include <sys/linker.h> 48#include <sys/sysent.h> 49#include <sys/imgact_elf.h> 50#include <sys/syscall.h> 51#include <sys/signalvar.h> 52#include <sys/vnode.h> 53 54#include <vm/vm.h> 55#include <vm/vm_param.h> 56 57#include <machine/elf.h> 58 59#include "linker_if.h" 60 61struct sysentvec elf64_freebsd_sysvec = { 62 SYS_MAXSYSCALL, 63 sysent, 64 0, 65 0, 66 NULL, 67 0, 68 NULL, 69 NULL, 70 __elfN(freebsd_fixup), 71 sendsig, 72 NULL, 73 NULL, 74 NULL, 75 "FreeBSD ELF64", 76 __elfN(coredump), 77 NULL, 78 MINSIGSTKSZ, 79 PAGE_SIZE, 80 VM_MIN_ADDRESS, 81 VM_MAXUSER_ADDRESS, 82 USRSTACK, 83 PS_STRINGS, 84 VM_PROT_READ | VM_PROT_WRITE, 85 exec_copyout_strings, 86 exec_setregs, 87 NULL 88}; 89 90static Elf64_Brandinfo freebsd_brand_info = { 91 ELFOSABI_FREEBSD, 92 EM_SPARCV9, 93 "FreeBSD", 94 NULL, 95 "/libexec/ld-elf.so.1", 96 &elf64_freebsd_sysvec, 97 NULL, 98 }; 99 100SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY, 101 (sysinit_cfunc_t) elf64_insert_brand_entry, 102 &freebsd_brand_info); 103 104static Elf64_Brandinfo freebsd_brand_oinfo = { 105 ELFOSABI_FREEBSD, 106 EM_SPARCV9, 107 "FreeBSD", 108 NULL, 109 "/usr/libexec/ld-elf.so.1", 110 &elf64_freebsd_sysvec, 111 NULL, 112 }; 113 114SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 115 (sysinit_cfunc_t) elf64_insert_brand_entry, 116 &freebsd_brand_oinfo); 117 118 119void 120elf64_dump_thread(struct thread *td __unused, void *dst __unused, 121 size_t *off __unused) 122{ 123} 124 125 126/* 127 * The following table holds for each relocation type: 128 * - the width in bits of the memory location the relocation 129 * applies to (not currently used) 130 * - the number of bits the relocation value must be shifted to the 131 * right (i.e. discard least significant bits) to fit into 132 * the appropriate field in the instruction word. 133 * - flags indicating whether 134 * * the relocation involves a symbol 135 * * the relocation is relative to the current position 136 * * the relocation is for a GOT entry 137 * * the relocation is relative to the load address 138 * 139 */ 140#define _RF_S 0x80000000 /* Resolve symbol */ 141#define _RF_A 0x40000000 /* Use addend */ 142#define _RF_P 0x20000000 /* Location relative */ 143#define _RF_G 0x10000000 /* GOT offset */ 144#define _RF_B 0x08000000 /* Load address relative */ 145#define _RF_U 0x04000000 /* Unaligned */ 146#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ 147#define _RF_RS(s) ( (s) & 0xff) /* right shift */ 148static int reloc_target_flags[] = { 149 0, /* NONE */ 150 _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */ 151 _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */ 152 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */ 153 _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */ 154 _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */ 155 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */ 156 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */ 157 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */ 158 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HI22 */ 159 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 22 */ 160 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 13 */ 161 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LO10 */ 162 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */ 163 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */ 164 _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */ 165 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */ 166 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */ 167 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */ 168 _RF_SZ(32) | _RF_RS(0), /* COPY */ 169 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* GLOB_DAT */ 170 _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */ 171 _RF_A| _RF_B| _RF_SZ(64) | _RF_RS(0), /* RELATIVE */ 172 _RF_S|_RF_A| _RF_U| _RF_SZ(32) | _RF_RS(0), /* UA_32 */ 173 174 _RF_A| _RF_SZ(32) | _RF_RS(0), /* PLT32 */ 175 _RF_A| _RF_SZ(32) | _RF_RS(10), /* HIPLT22 */ 176 _RF_A| _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ 177 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */ 178 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PCPLT22 */ 179 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT10 */ 180 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 10 */ 181 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 11 */ 182 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* 64 */ 183 _RF_S|_RF_A|/*extra*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */ 184 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(42), /* HH22 */ 185 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(32), /* HM10 */ 186 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* LM22 */ 187 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(42), /* PC_HH22 */ 188 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(32), /* PC_HM10 */ 189 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC_LM22 */ 190 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP16 */ 191 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP19 */ 192 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */ 193 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 7 */ 194 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 5 */ 195 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 6 */ 196 _RF_S|_RF_A|_RF_P| _RF_SZ(64) | _RF_RS(0), /* DISP64 */ 197 _RF_A| _RF_SZ(64) | _RF_RS(0), /* PLT64 */ 198 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HIX22 */ 199 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LOX10 */ 200 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(22), /* H44 */ 201 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(12), /* M44 */ 202 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* L44 */ 203 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* REGISTER */ 204 _RF_S|_RF_A| _RF_U| _RF_SZ(64) | _RF_RS(0), /* UA64 */ 205 _RF_S|_RF_A| _RF_U| _RF_SZ(16) | _RF_RS(0), /* UA16 */ 206}; 207 208#if 0 209static const char *reloc_names[] = { 210 "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8", 211 "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22", 212 "22", "13", "LO10", "GOT10", "GOT13", 213 "GOT22", "PC10", "PC22", "WPLT30", "COPY", 214 "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32", 215 "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32", 216 "10", "11", "64", "OLO10", "HH22", 217 "HM10", "LM22", "PC_HH22", "PC_HM10", "PC_LM22", 218 "WDISP16", "WDISP19", "GLOB_JMP", "7", "5", "6", 219 "DISP64", "PLT64", "HIX22", "LOX10", "H44", "M44", 220 "L44", "REGISTER", "UA64", "UA16" 221}; 222#endif 223 224#define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) 225#define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) 226#define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) 227#define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) 228#define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) 229#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) 230#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) 231 232static long reloc_target_bitmask[] = { 233#define _BM(x) (~(-(1ULL << (x)))) 234 0, /* NONE */ 235 _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */ 236 _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */ 237 _BM(30), _BM(22), /* WDISP30, WDISP22 */ 238 _BM(22), _BM(22), /* HI22, _22 */ 239 _BM(13), _BM(10), /* RELOC_13, _LO10 */ 240 _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */ 241 _BM(10), _BM(22), /* _PC10, _PC22 */ 242 _BM(30), 0, /* _WPLT30, _COPY */ 243 _BM(32), _BM(32), _BM(32), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ 244 _BM(32), _BM(32), /* _UA32, PLT32 */ 245 _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */ 246 _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */ 247 _BM(10), _BM(11), -1, /* _10, _11, _64 */ 248 _BM(10), _BM(22), /* _OLO10, _HH22 */ 249 _BM(10), _BM(22), /* _HM10, _LM22 */ 250 _BM(22), _BM(10), _BM(22), /* _PC_HH22, _PC_HM10, _PC_LM22 */ 251 _BM(16), _BM(19), /* _WDISP16, _WDISP19 */ 252 -1, /* GLOB_JMP */ 253 _BM(7), _BM(5), _BM(6) /* _7, _5, _6 */ 254 -1, -1, /* DISP64, PLT64 */ 255 _BM(22), _BM(13), /* HIX22, LOX10 */ 256 _BM(22), _BM(10), _BM(13), /* H44, M44, L44 */ 257 -1, -1, _BM(16), /* REGISTER, UA64, UA16 */ 258#undef _BM 259}; 260#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) 261 262int 263elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 264 int type, elf_lookup_fn lookup) 265{ 266 const Elf_Rela *rela; 267 Elf_Addr value; 268 Elf_Addr *where; 269 270 if (type != ELF_RELOC_RELA) 271 return (-1); 272 273 rela = (const Elf_Rela *)data; 274 if (ELF_R_TYPE(rela->r_info) != R_SPARC_RELATIVE) 275 return (-1); 276 277 value = rela->r_addend + (Elf_Addr)lf->address; 278 where = (Elf_Addr *)((Elf_Addr)lf->address + rela->r_offset); 279 280 *where = value; 281 282 return (0); 283} 284 285/* Process one elf relocation with addend. */ 286int 287elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 288 elf_lookup_fn lookup) 289{ 290 const Elf_Rela *rela; 291 Elf_Word *where32; 292 Elf_Addr *where; 293 Elf_Size rtype, symidx; 294 Elf_Addr value; 295 Elf_Addr mask; 296 Elf_Addr addr; 297 298 if (type != ELF_RELOC_RELA) 299 return (-1); 300 301 rela = (const Elf_Rela *)data; 302 where = (Elf_Addr *)(relocbase + rela->r_offset); 303 where32 = (Elf_Word *)where; 304 rtype = ELF_R_TYPE(rela->r_info); 305 symidx = ELF_R_SYM(rela->r_info); 306 307 if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE) 308 return (0); 309 310 if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY || 311 rtype > R_SPARC_UA16) 312 return (-1); 313 314 if (RELOC_UNALIGNED(rtype)) 315 return (-1); 316 317 value = rela->r_addend; 318 319 if (RELOC_RESOLVE_SYMBOL(rtype)) { 320 addr = lookup(lf, symidx, 1); 321 if (addr == 0) 322 return (-1); 323 value += addr; 324 } 325 326 if (RELOC_PC_RELATIVE(rtype)) 327 value -= (Elf_Addr)where; 328 329 if (RELOC_BASE_RELATIVE(rtype)) 330 value += relocbase; 331 332 mask = RELOC_VALUE_BITMASK(rtype); 333 value >>= RELOC_VALUE_RIGHTSHIFT(rtype); 334 value &= mask; 335 336 if (RELOC_TARGET_SIZE(rtype) > 32) { 337 *where &= ~mask; 338 *where |= value; 339 } else { 340 *where32 &= ~mask; 341 *where32 |= value; 342 } 343 344 return (0); 345} 346 347int 348elf_cpu_load_file(linker_file_t lf __unused) 349{ 350 351 return (0); 352} 353 354int 355elf_cpu_unload_file(linker_file_t lf __unused) 356{ 357 358 return (0); 359} 360