elf_machdep.c revision 212998
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 212998 2010-09-22 12:52:12Z kib $"); 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/proc.h> 51#include <sys/sysent.h> 52#include <sys/imgact_elf.h> 53#include <sys/syscall.h> 54#include <sys/signalvar.h> 55#include <sys/vnode.h> 56 57#include <vm/vm.h> 58#include <vm/vm_param.h> 59 60#include <machine/elf.h> 61 62#include "linker_if.h" 63 64static struct sysentvec elf64_freebsd_sysvec = { 65 .sv_size = SYS_MAXSYSCALL, 66 .sv_table = sysent, 67 .sv_mask = 0, 68 .sv_sigsize = 0, 69 .sv_sigtbl = NULL, 70 .sv_errsize = 0, 71 .sv_errtbl = NULL, 72 .sv_transtrap = NULL, 73 .sv_fixup = __elfN(freebsd_fixup), 74 .sv_sendsig = sendsig, 75 .sv_sigcode = NULL, 76 .sv_szsigcode = NULL, 77 .sv_prepsyscall = NULL, 78 .sv_name = "FreeBSD ELF64", 79 .sv_coredump = __elfN(coredump), 80 .sv_imgact_try = NULL, 81 .sv_minsigstksz = MINSIGSTKSZ, 82 .sv_pagesize = PAGE_SIZE, 83 .sv_minuser = VM_MIN_ADDRESS, 84 .sv_maxuser = VM_MAXUSER_ADDRESS, 85 .sv_usrstack = USRSTACK, 86 .sv_psstrings = PS_STRINGS, 87 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 88 .sv_copyout_strings = exec_copyout_strings, 89 .sv_setregs = exec_setregs, 90 .sv_fixlimit = NULL, 91 .sv_maxssiz = NULL, 92 .sv_flags = SV_ABI_FREEBSD | SV_LP64, 93 .sv_set_syscall_retval = cpu_set_syscall_retval, 94 .sv_fetch_syscall_args = cpu_fetch_syscall_args, 95 .sv_syscallnames = syscallnames, 96}; 97 98static Elf64_Brandinfo freebsd_brand_info = { 99 .brand = ELFOSABI_FREEBSD, 100 .machine = EM_SPARCV9, 101 .compat_3_brand = "FreeBSD", 102 .emul_path = NULL, 103 .interp_path = "/libexec/ld-elf.so.1", 104 .sysvec = &elf64_freebsd_sysvec, 105 .interp_newpath = NULL, 106 .brand_note = &elf64_freebsd_brandnote, 107 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 108}; 109 110SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST, 111 (sysinit_cfunc_t) elf64_insert_brand_entry, 112 &freebsd_brand_info); 113 114static Elf64_Brandinfo freebsd_brand_oinfo = { 115 .brand = ELFOSABI_FREEBSD, 116 .machine = EM_SPARCV9, 117 .compat_3_brand = "FreeBSD", 118 .emul_path = NULL, 119 .interp_path = "/usr/libexec/ld-elf.so.1", 120 .sysvec = &elf64_freebsd_sysvec, 121 .interp_newpath = NULL, 122 .brand_note = &elf64_freebsd_brandnote, 123 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 124}; 125 126SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY, 127 (sysinit_cfunc_t) elf64_insert_brand_entry, 128 &freebsd_brand_oinfo); 129 130 131void 132elf64_dump_thread(struct thread *td __unused, void *dst __unused, 133 size_t *off __unused) 134{ 135} 136 137 138/* 139 * The following table holds for each relocation type: 140 * - the width in bits of the memory location the relocation 141 * applies to (not currently used) 142 * - the number of bits the relocation value must be shifted to the 143 * right (i.e. discard least significant bits) to fit into 144 * the appropriate field in the instruction word. 145 * - flags indicating whether 146 * * the relocation involves a symbol 147 * * the relocation is relative to the current position 148 * * the relocation is for a GOT entry 149 * * the relocation is relative to the load address 150 * 151 */ 152#define _RF_S 0x80000000 /* Resolve symbol */ 153#define _RF_A 0x40000000 /* Use addend */ 154#define _RF_P 0x20000000 /* Location relative */ 155#define _RF_G 0x10000000 /* GOT offset */ 156#define _RF_B 0x08000000 /* Load address relative */ 157#define _RF_U 0x04000000 /* Unaligned */ 158#define _RF_X 0x02000000 /* Bare symbols, needs proc */ 159#define _RF_SZ(s) (((s) & 0xff) << 8) /* memory target size */ 160#define _RF_RS(s) ( (s) & 0xff) /* right shift */ 161static const int reloc_target_flags[] = { 162 0, /* NONE */ 163 _RF_S|_RF_A| _RF_SZ(8) | _RF_RS(0), /* RELOC_8 */ 164 _RF_S|_RF_A| _RF_SZ(16) | _RF_RS(0), /* RELOC_16 */ 165 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* RELOC_32 */ 166 _RF_S|_RF_A|_RF_P| _RF_SZ(8) | _RF_RS(0), /* DISP_8 */ 167 _RF_S|_RF_A|_RF_P| _RF_SZ(16) | _RF_RS(0), /* DISP_16 */ 168 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* DISP_32 */ 169 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_30 */ 170 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP_22 */ 171 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(10), /* HI22 */ 172 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 22 */ 173 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 13 */ 174 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* LO10 */ 175 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT10 */ 176 _RF_G| _RF_SZ(32) | _RF_RS(0), /* GOT13 */ 177 _RF_G| _RF_SZ(32) | _RF_RS(10), /* GOT22 */ 178 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PC10 */ 179 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC22 */ 180 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WPLT30 */ 181 _RF_SZ(32) | _RF_RS(0), /* COPY */ 182 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* GLOB_DAT */ 183 _RF_SZ(32) | _RF_RS(0), /* JMP_SLOT */ 184 _RF_A| _RF_B| _RF_SZ(64) | _RF_RS(0), /* RELATIVE */ 185 _RF_S|_RF_A| _RF_U| _RF_SZ(32) | _RF_RS(0), /* UA_32 */ 186 187 _RF_A| _RF_SZ(32) | _RF_RS(0), /* PLT32 */ 188 _RF_A| _RF_SZ(32) | _RF_RS(10), /* HIPLT22 */ 189 _RF_A| _RF_SZ(32) | _RF_RS(0), /* LOPLT10 */ 190 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT32 */ 191 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PCPLT22 */ 192 _RF_A|_RF_P| _RF_SZ(32) | _RF_RS(0), /* PCPLT10 */ 193 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 10 */ 194 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 11 */ 195 _RF_S|_RF_A|_RF_X| _RF_SZ(64) | _RF_RS(0), /* 64 */ 196 _RF_S|_RF_A|/*extra*/ _RF_SZ(32) | _RF_RS(0), /* OLO10 */ 197 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(42), /* HH22 */ 198 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(32), /* HM10 */ 199 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(10), /* LM22 */ 200 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(42), /* PC_HH22 */ 201 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(32), /* PC_HM10 */ 202 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(10), /* PC_LM22 */ 203 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP16 */ 204 _RF_S|_RF_A|_RF_P| _RF_SZ(32) | _RF_RS(2), /* WDISP19 */ 205 _RF_S|_RF_A| _RF_SZ(32) | _RF_RS(0), /* GLOB_JMP */ 206 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 7 */ 207 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 5 */ 208 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* 6 */ 209 _RF_S|_RF_A|_RF_P| _RF_SZ(64) | _RF_RS(0), /* DISP64 */ 210 _RF_A| _RF_SZ(64) | _RF_RS(0), /* PLT64 */ 211 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(10), /* HIX22 */ 212 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* LOX10 */ 213 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(22), /* H44 */ 214 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(12), /* M44 */ 215 _RF_S|_RF_A|_RF_X| _RF_SZ(32) | _RF_RS(0), /* L44 */ 216 _RF_S|_RF_A| _RF_SZ(64) | _RF_RS(0), /* REGISTER */ 217 _RF_S|_RF_A| _RF_U| _RF_SZ(64) | _RF_RS(0), /* UA64 */ 218 _RF_S|_RF_A| _RF_U| _RF_SZ(16) | _RF_RS(0), /* UA16 */ 219}; 220 221#if 0 222static const char *reloc_names[] = { 223 "NONE", "RELOC_8", "RELOC_16", "RELOC_32", "DISP_8", 224 "DISP_16", "DISP_32", "WDISP_30", "WDISP_22", "HI22", 225 "22", "13", "LO10", "GOT10", "GOT13", 226 "GOT22", "PC10", "PC22", "WPLT30", "COPY", 227 "GLOB_DAT", "JMP_SLOT", "RELATIVE", "UA_32", "PLT32", 228 "HIPLT22", "LOPLT10", "LOPLT10", "PCPLT22", "PCPLT32", 229 "10", "11", "64", "OLO10", "HH22", 230 "HM10", "LM22", "PC_HH22", "PC_HM10", "PC_LM22", 231 "WDISP16", "WDISP19", "GLOB_JMP", "7", "5", "6", 232 "DISP64", "PLT64", "HIX22", "LOX10", "H44", "M44", 233 "L44", "REGISTER", "UA64", "UA16" 234}; 235#endif 236 237#define RELOC_RESOLVE_SYMBOL(t) ((reloc_target_flags[t] & _RF_S) != 0) 238#define RELOC_PC_RELATIVE(t) ((reloc_target_flags[t] & _RF_P) != 0) 239#define RELOC_BASE_RELATIVE(t) ((reloc_target_flags[t] & _RF_B) != 0) 240#define RELOC_UNALIGNED(t) ((reloc_target_flags[t] & _RF_U) != 0) 241#define RELOC_USE_ADDEND(t) ((reloc_target_flags[t] & _RF_A) != 0) 242#define RELOC_BARE_SYMBOL(t) ((reloc_target_flags[t] & _RF_X) != 0) 243#define RELOC_TARGET_SIZE(t) ((reloc_target_flags[t] >> 8) & 0xff) 244#define RELOC_VALUE_RIGHTSHIFT(t) (reloc_target_flags[t] & 0xff) 245 246static const long reloc_target_bitmask[] = { 247#define _BM(x) (~(-(1ULL << (x)))) 248 0, /* NONE */ 249 _BM(8), _BM(16), _BM(32), /* RELOC_8, _16, _32 */ 250 _BM(8), _BM(16), _BM(32), /* DISP8, DISP16, DISP32 */ 251 _BM(30), _BM(22), /* WDISP30, WDISP22 */ 252 _BM(22), _BM(22), /* HI22, _22 */ 253 _BM(13), _BM(10), /* RELOC_13, _LO10 */ 254 _BM(10), _BM(13), _BM(22), /* GOT10, GOT13, GOT22 */ 255 _BM(10), _BM(22), /* _PC10, _PC22 */ 256 _BM(30), 0, /* _WPLT30, _COPY */ 257 _BM(32), _BM(32), _BM(32), /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ 258 _BM(32), _BM(32), /* _UA32, PLT32 */ 259 _BM(22), _BM(10), /* _HIPLT22, LOPLT10 */ 260 _BM(32), _BM(22), _BM(10), /* _PCPLT32, _PCPLT22, _PCPLT10 */ 261 _BM(10), _BM(11), -1, /* _10, _11, _64 */ 262 _BM(13), _BM(22), /* _OLO10, _HH22 */ 263 _BM(10), _BM(22), /* _HM10, _LM22 */ 264 _BM(22), _BM(10), _BM(22), /* _PC_HH22, _PC_HM10, _PC_LM22 */ 265 _BM(16), _BM(19), /* _WDISP16, _WDISP19 */ 266 -1, /* GLOB_JMP */ 267 _BM(7), _BM(5), _BM(6) /* _7, _5, _6 */ 268 -1, -1, /* DISP64, PLT64 */ 269 _BM(22), _BM(13), /* HIX22, LOX10 */ 270 _BM(22), _BM(10), _BM(13), /* H44, M44, L44 */ 271 -1, -1, _BM(16), /* REGISTER, UA64, UA16 */ 272#undef _BM 273}; 274#define RELOC_VALUE_BITMASK(t) (reloc_target_bitmask[t]) 275 276int 277elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 278 int type, elf_lookup_fn lookup) 279{ 280 const Elf_Rela *rela; 281 Elf_Addr value; 282 Elf_Addr *where; 283 284 if (type != ELF_RELOC_RELA) 285 return (-1); 286 287 rela = (const Elf_Rela *)data; 288 if (ELF64_R_TYPE_ID(rela->r_info) != R_SPARC_RELATIVE) 289 return (-1); 290 291 value = rela->r_addend + (Elf_Addr)lf->address; 292 where = (Elf_Addr *)((Elf_Addr)lf->address + rela->r_offset); 293 294 *where = elf_relocaddr(lf, value); 295 296 return (0); 297} 298 299/* Process one elf relocation with addend. */ 300int 301elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 302 elf_lookup_fn lookup) 303{ 304 const Elf_Rela *rela; 305 Elf_Word *where32; 306 Elf_Addr *where; 307 Elf_Size rtype, symidx; 308 Elf_Addr value; 309 Elf_Addr mask; 310 Elf_Addr addr; 311 312 if (type != ELF_RELOC_RELA) 313 return (-1); 314 315 rela = (const Elf_Rela *)data; 316 where = (Elf_Addr *)(relocbase + rela->r_offset); 317 where32 = (Elf_Word *)where; 318 rtype = ELF64_R_TYPE_ID(rela->r_info); 319 symidx = ELF_R_SYM(rela->r_info); 320 321 if (rtype == R_SPARC_NONE || rtype == R_SPARC_RELATIVE) 322 return (0); 323 324 if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY || 325 rtype >= sizeof(reloc_target_bitmask) / 326 sizeof(*reloc_target_bitmask)) 327 return (-1); 328 329 if (RELOC_UNALIGNED(rtype)) 330 return (-1); 331 332 value = rela->r_addend; 333 334 if (RELOC_RESOLVE_SYMBOL(rtype)) { 335 addr = lookup(lf, symidx, 1); 336 if (addr == 0) 337 return (-1); 338 value += addr; 339 if (RELOC_BARE_SYMBOL(rtype)) 340 value = elf_relocaddr(lf, value); 341 } 342 343 if (rtype == R_SPARC_OLO10) 344 value = (value & 0x3ff) + ELF64_R_TYPE_DATA(rela->r_info); 345 346 if (RELOC_PC_RELATIVE(rtype)) 347 value -= (Elf_Addr)where; 348 349 if (RELOC_BASE_RELATIVE(rtype)) { 350 value = elf_relocaddr(lf, value + relocbase); 351 } 352 353 mask = RELOC_VALUE_BITMASK(rtype); 354 value >>= RELOC_VALUE_RIGHTSHIFT(rtype); 355 value &= mask; 356 357 if (RELOC_TARGET_SIZE(rtype) > 32) { 358 *where &= ~mask; 359 *where |= value; 360 } else { 361 *where32 &= ~mask; 362 *where32 |= value; 363 } 364 365 return (0); 366} 367 368int 369elf_cpu_load_file(linker_file_t lf __unused) 370{ 371 372 return (0); 373} 374 375int 376elf_cpu_unload_file(linker_file_t lf __unused) 377{ 378 379 return (0); 380} 381