elf_machdep.c revision 197729
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: head/sys/sparc64/sparc64/elf_machdep.c 197729 2009-10-03 11:57:21Z bz $"); 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 63static struct sysentvec elf64_freebsd_sysvec = { 64 .sv_size = SYS_MAXSYSCALL, 65 .sv_table = sysent, 66 .sv_mask = 0, 67 .sv_sigsize = 0, 68 .sv_sigtbl = NULL, 69 .sv_errsize = 0, 70 .sv_errtbl = NULL, 71 .sv_transtrap = NULL, 72 .sv_fixup = __elfN(freebsd_fixup), 73 .sv_sendsig = sendsig, 74 .sv_sigcode = NULL, 75 .sv_szsigcode = NULL, 76 .sv_prepsyscall = NULL, 77 .sv_name = "FreeBSD ELF64", 78 .sv_coredump = __elfN(coredump), 79 .sv_imgact_try = NULL, 80 .sv_minsigstksz = MINSIGSTKSZ, 81 .sv_pagesize = PAGE_SIZE, 82 .sv_minuser = VM_MIN_ADDRESS, 83 .sv_maxuser = VM_MAXUSER_ADDRESS, 84 .sv_usrstack = USRSTACK, 85 .sv_psstrings = PS_STRINGS, 86 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 87 .sv_copyout_strings = exec_copyout_strings, 88 .sv_setregs = exec_setregs, 89 .sv_fixlimit = NULL, 90 .sv_maxssiz = NULL, 91 .sv_flags = SV_ABI_FREEBSD | SV_LP64 92}; 93 94static Elf64_Brandinfo freebsd_brand_info = { 95 .brand = ELFOSABI_FREEBSD, 96 .machine = EM_SPARCV9, 97 .compat_3_brand = "FreeBSD", 98 .emul_path = NULL, 99 .interp_path = "/libexec/ld-elf.so.1", 100 .sysvec = &elf64_freebsd_sysvec, 101 .interp_newpath = NULL, 102 .brand_note = &elf64_freebsd_brandnote, 103 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 104}; 105 106SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 107 (sysinit_cfunc_t) elf64_insert_brand_entry, 108 &freebsd_brand_info); 109 110static Elf64_Brandinfo freebsd_brand_oinfo = { 111 .brand = ELFOSABI_FREEBSD, 112 .machine = EM_SPARCV9, 113 .compat_3_brand = "FreeBSD", 114 .emul_path = NULL, 115 .interp_path = "/usr/libexec/ld-elf.so.1", 116 .sysvec = &elf64_freebsd_sysvec, 117 .interp_newpath = NULL, 118 .brand_note = &elf64_freebsd_brandnote, 119 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 120}; 121 122SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 123 (sysinit_cfunc_t) elf64_insert_brand_entry, 124 &freebsd_brand_oinfo); 125 126 127void 128elf64_dump_thread(struct thread *td __unused, void *dst __unused, 129 size_t *off __unused) 130{ 131} 132 133 134/* 135 * The following table holds for each relocation type: 136 * - the width in bits of the memory location the relocation 137 * applies to (not currently used) 138 * - the number of bits the relocation value must be shifted to the 139 * right (i.e. discard least significant bits) to fit into 140 * the appropriate field in the instruction word. 141 * - flags indicating whether 142 * * the relocation involves a symbol 143 * * the relocation is relative to the current position 144 * * the relocation is for a GOT entry 145 * * the relocation is relative to the load address 146 * 147 */ 148#define _RF_S 0x80000000 /* Resolve symbol */ 149#define _RF_A 0x40000000 /* Use addend */ 150#define _RF_P 0x20000000 /* Location relative */ 151#define _RF_G 0x10000000 /* GOT offset */ 152#define _RF_B 0x08000000 /* Load address relative */ 153#define _RF_U 0x04000000 /* Unaligned */ 154#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ 155#define _RF_RS(s) ( (s) & 0xff) /* right shift */ 156static const int reloc_target_flags[] = { 157 0, /* NONE */ 158 _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */ 159 _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */ 160 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */ 161 _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */ 162 _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */ 163 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */ 164 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */ 165 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */ 166 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HI22 */ 167 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 22 */ 168 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 13 */ 169 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LO10 */ 170 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */ 171 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */ 172 _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */ 173 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */ 174 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */ 175 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */ 176 _RF_SZ(32) | _RF_RS(0), /* COPY */ 177 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* GLOB_DAT */ 178 _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */ 179 _RF_A| _RF_B| _RF_SZ(64) | _RF_RS(0), /* RELATIVE */ 180 _RF_S|_RF_A| _RF_U| _RF_SZ(32) | _RF_RS(0), /* UA_32 */ 181 182 _RF_A| _RF_SZ(32) | _RF_RS(0), /* PLT32 */ 183 _RF_A| _RF_SZ(32) | _RF_RS(10), /* HIPLT22 */ 184 _RF_A| _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ 185 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */ 186 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PCPLT22 */ 187 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT10 */ 188 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 10 */ 189 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 11 */ 190 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* 64 */ 191 _RF_S|_RF_A|/*extra*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */ 192 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(42), /* HH22 */ 193 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(32), /* HM10 */ 194 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* LM22 */ 195 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(42), /* PC_HH22 */ 196 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(32), /* PC_HM10 */ 197 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC_LM22 */ 198 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP16 */ 199 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP19 */ 200 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */ 201 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 7 */ 202 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 5 */ 203 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* 6 */ 204 _RF_S|_RF_A|_RF_P| _RF_SZ(64) | _RF_RS(0), /* DISP64 */ 205 _RF_A| _RF_SZ(64) | _RF_RS(0), /* PLT64 */ 206 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(10), /* HIX22 */ 207 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* LOX10 */ 208 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(22), /* H44 */ 209 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(12), /* M44 */ 210 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* L44 */ 211 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* REGISTER */ 212 _RF_S|_RF_A| _RF_U| _RF_SZ(64) | _RF_RS(0), /* UA64 */ 213 _RF_S|_RF_A| _RF_U| _RF_SZ(16) | _RF_RS(0), /* UA16 */ 214}; 215 216#if 0 217static const char *reloc_names[] = { 218 "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8", 219 "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22", 220 "22", "13", "LO10", "GOT10", "GOT13", 221 "GOT22", "PC10", "PC22", "WPLT30", "COPY", 222 "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32", 223 "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32", 224 "10", "11", "64", "OLO10", "HH22", 225 "HM10", "LM22", "PC_HH22", "PC_HM10", "PC_LM22", 226 "WDISP16", "WDISP19", "GLOB_JMP", "7", "5", "6", 227 "DISP64", "PLT64", "HIX22", "LOX10", "H44", "M44", 228 "L44", "REGISTER", "UA64", "UA16" 229}; 230#endif 231 232#define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) 233#define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) 234#define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) 235#define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) 236#define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) 237#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) 238#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) 239 240static const long reloc_target_bitmask[] = { 241#define _BM(x) (~(-(1ULL << (x)))) 242 0, /* NONE */ 243 _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */ 244 _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */ 245 _BM(30), _BM(22), /* WDISP30, WDISP22 */ 246 _BM(22), _BM(22), /* HI22, _22 */ 247 _BM(13), _BM(10), /* RELOC_13, _LO10 */ 248 _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */ 249 _BM(10), _BM(22), /* _PC10, _PC22 */ 250 _BM(30), 0, /* _WPLT30, _COPY */ 251 _BM(32), _BM(32), _BM(32), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ 252 _BM(32), _BM(32), /* _UA32, PLT32 */ 253 _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */ 254 _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */ 255 _BM(10), _BM(11), -1, /* _10, _11, _64 */ 256 _BM(13), _BM(22), /* _OLO10, _HH22 */ 257 _BM(10), _BM(22), /* _HM10, _LM22 */ 258 _BM(22), _BM(10), _BM(22), /* _PC_HH22, _PC_HM10, _PC_LM22 */ 259 _BM(16), _BM(19), /* _WDISP16, _WDISP19 */ 260 -1, /* GLOB_JMP */ 261 _BM(7), _BM(5), _BM(6) /* _7, _5, _6 */ 262 -1, -1, /* DISP64, PLT64 */ 263 _BM(22), _BM(13), /* HIX22, LOX10 */ 264 _BM(22), _BM(10), _BM(13), /* H44, M44, L44 */ 265 -1, -1, _BM(16), /* REGISTER, UA64, UA16 */ 266#undef _BM 267}; 268#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) 269 270int 271elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 272 int type, elf_lookup_fn lookup) 273{ 274 const Elf_Rela *rela; 275 Elf_Addr value; 276 Elf_Addr *where; 277 278 if (type != ELF_RELOC_RELA) 279 return (-1); 280 281 rela = (const Elf_Rela *)data; 282 if (ELF64_R_TYPE_ID(rela->r_info) != R_SPARC_RELATIVE) 283 return (-1); 284 285 value = rela->r_addend + (Elf_Addr)lf->address; 286 where = (Elf_Addr *)((Elf_Addr)lf->address + rela->r_offset); 287 288 *where = elf_relocaddr(lf, value); 289 290 return (0); 291} 292 293/* Process one elf relocation with addend. */ 294int 295elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 296 elf_lookup_fn lookup) 297{ 298 const Elf_Rela *rela; 299 Elf_Word *where32; 300 Elf_Addr *where; 301 Elf_Size rtype, symidx; 302 Elf_Addr value; 303 Elf_Addr mask; 304 Elf_Addr addr; 305 306 if (type != ELF_RELOC_RELA) 307 return (-1); 308 309 rela = (const Elf_Rela *)data; 310 where = (Elf_Addr *)(relocbase + rela->r_offset); 311 where32 = (Elf_Word *)where; 312 rtype = ELF64_R_TYPE_ID(rela->r_info); 313 symidx = ELF_R_SYM(rela->r_info); 314 315 if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE) 316 return (0); 317 318 if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY || 319 rtype >= sizeof(reloc_target_bitmask) / 320 sizeof(*reloc_target_bitmask)) 321 return (-1); 322 323 if (RELOC_UNALIGNED(rtype)) 324 return (-1); 325 326 value = rela->r_addend; 327 328 if (RELOC_RESOLVE_SYMBOL(rtype)) { 329 addr = lookup(lf, symidx, 1); 330 if (addr == 0) 331 return (-1); 332 value += addr; 333 } 334 335 if (rtype == R_SPARC_OLO10) 336 value = (value & 0x3ff) + ELF64_R_TYPE_DATA(rela->r_info); 337 338 if (RELOC_PC_RELATIVE(rtype)) 339 value -= (Elf_Addr)where; 340 341 if (RELOC_BASE_RELATIVE(rtype)) { 342 value = elf_relocaddr(lf, value + relocbase); 343 } 344 345 mask = RELOC_VALUE_BITMASK(rtype); 346 value >>= RELOC_VALUE_RIGHTSHIFT(rtype); 347 value &= mask; 348 349 if (RELOC_TARGET_SIZE(rtype) > 32) { 350 *where &= ~mask; 351 *where |= value; 352 } else { 353 *where32 &= ~mask; 354 *where32 |= value; 355 } 356 357 return (0); 358} 359 360int 361elf_cpu_load_file(linker_file_t lf __unused) 362{ 363 364 return (0); 365} 366 367int 368elf_cpu_unload_file(linker_file_t lf __unused) 369{ 370 371 return (0); 372} 373