1 /* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
2 Copyright (C) 1995-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
20 #define dl_machine_h 1
22 #define ELF_MACHINE_NAME "ia64"
31 /* Translate a processor specific dynamic tag to the index
33 #define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
35 static inline void __attribute__ ((always_inline))
36 __ia64_init_bootstrap_fdesc_table (struct link_map *map)
38 Elf64_Addr *boot_table;
40 /* careful: this will be called before got has been relocated... */
41 asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table));
43 map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
44 map->l_mach.fptr_table = boot_table;
47 #define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
48 __ia64_init_bootstrap_fdesc_table (BOOTSTRAP_MAP);
50 /* Return nonzero iff ELF header is compatible with the running host. */
51 static inline int __attribute__ ((unused))
52 elf_machine_matches_host (const Elf64_Ehdr *ehdr)
54 return ehdr->e_machine == EM_IA_64;
58 /* Return the link-time address of _DYNAMIC. */
59 static inline Elf64_Addr __attribute__ ((unused, const))
60 elf_machine_dynamic (void)
66 " .type __dynamic_ltv#, @object\n"
67 " .size __dynamic_ltv#, 8\n"
69 " data8 @ltv(_DYNAMIC#)\n"
71 " addl %0 = @gprel(__dynamic_ltv#), gp ;;"
78 /* Return the run-time load address of the shared object. */
79 static inline Elf64_Addr __attribute__ ((unused))
80 elf_machine_load_address (void)
91 " addl %1 = @gprel(2b), gp ;;"
92 : "=r" (ip), "=r" (p));
94 return ip - (Elf64_Addr) *p;
97 /* Set up the loaded object described by L so its unrelocated PLT
98 entries will jump to the on-demand fixup code in dl-runtime.c. */
100 static inline int __attribute__ ((unused, always_inline))
101 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
103 extern void _dl_runtime_resolve (void);
104 extern void _dl_runtime_profile (void);
108 register Elf64_Addr gp __asm__ ("gp");
109 Elf64_Addr *reserve, doit;
112 * Careful with the typecast here or it will try to add l-l_addr
115 reserve = ((Elf64_Addr *)
116 (l->l_info[DT_IA_64 (PLT_RESERVE)]->d_un.d_ptr + l->l_addr));
117 /* Identify this shared object. */
118 reserve[0] = (Elf64_Addr) l;
120 /* This function will be called to perform the relocation. */
122 doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_resolve)->ip;
125 if (GLRO(dl_profile) != NULL
126 && _dl_name_match_p (GLRO(dl_profile), l))
128 /* This is the object we are looking for. Say that we really
129 want profiling and the timers are started. */
130 GL(dl_profile_map) = l;
132 doit = (Elf64_Addr) ELF_PTR_TO_FDESC (&_dl_runtime_profile)->ip;
142 /* Names of the architecture-specific auditing callback functions. */
143 #define ARCH_LA_PLTENTER ia64_gnu_pltenter
144 #define ARCH_LA_PLTEXIT ia64_gnu_pltexit
146 /* Undo the adds out0 = 16, sp below to get at the value we want in
148 #define DL_STACK_END(cookie) \
149 ((void *) (((long) (cookie)) - 16))
151 /* Initial entry point code for the dynamic linker.
152 The C function `_dl_start' is the real entry point;
153 its return value is the user program's entry point. */
155 #define RTLD_START asm ( \
157 " .global _start#\n" \
165 " .save ar.pfs, r32\n" \
166 " alloc loc0 = ar.pfs, 0, 3, 4, 0\n" \
169 " addl r3 = @gprel(0b), r0\n" \
173 " /* Calculate the GP, and save a copy in loc1. */\n" \
174 " sub gp = r2, r3\n" \
175 " movl r8 = 0x9804c0270033f\n" \
179 " mov ar.fpsr = r8\n" \
180 " sub loc1 = r2, r3\n" \
181 " /* _dl_start wants a pointer to the pointer to the arg block and\n" \
182 " the arg block starts with an integer, thus the magic 16. */\n" \
183 " adds out0 = 16, sp\n" \
186 " br.call.sptk.many b0 = _dl_start#\n" \
190 " /* FALLTHRU */\n" \
191 " .global _dl_start_user#\n" \
192 " .proc _dl_start_user#\n" \
193 "_dl_start_user:\n" \
198 " .save ar.pfs, r32\n" \
201 " addl r3 = @gprel(_dl_skip_args), gp\n" \
202 " adds r11 = 24, sp /* Load the address of argv. */\n" \
203 " /* Save the pointer to the user entry point fptr in loc2. */\n" \
204 " mov loc2 = ret0\n" \
209 " adds r10 = 16, sp /* Load the address of argc. */\n" \
210 " mov out2 = r11\n" \
212 " /* See if we were run as a command with the executable file\n" \
213 " name as an extra leading argument. If so, adjust the argv\n" \
214 " pointer to skip _dl_skip_args words.\n" \
215 " Note that _dl_skip_args is an integer, not a long - Jes\n" \
217 " The stack pointer has to be 16 byte aligned. We cannot simply\n" \
218 " addjust the stack pointer. We have to move the whole argv and\n" \
219 " envp and adjust _dl_argv by _dl_skip_args. H.J. */\n" \
222 " ld8 out1 = [r10] /* is argc actually stored as a long\n" \
223 " or as an int? */\n" \
224 " addl r2 = @ltoff(_dl_argv), gp\n" \
228 " ld8 r2 = [r2] /* Get the address of _dl_argv. */\n" \
229 " sub out1 = out1, r3 /* Get the new argc. */\n" \
230 " shladd r3 = r3, 3, r0\n" \
235 " ld8 r17 = [r2] /* Get _dl_argv. */\n" \
236 " add r15 = r11, r3 /* The address of the argv we move */\n" \
239 " /* ??? Could probably merge these two loops into 3 bundles.\n" \
240 " using predication to control which set of copies we're on. */\n" \
241 "1: /* Copy argv. */\n" \
243 " ld8 r16 = [r15], 8 /* Load the value in the old argv. */\n" \
247 " st8 [r11] = r16, 8 /* Store it in the new argv. */\n" \
248 " cmp.ne p6, p7 = 0, r16\n" \
249 "(p6) br.cond.dptk.few 1b\n" \
253 " mov out3 = r11\n" \
254 " sub r17 = r17, r3 /* Substract _dl_skip_args. */\n" \
255 " addl out0 = @gprel(_rtld_local), gp\n" \
257 "1: /* Copy env. */\n" \
259 " ld8 r16 = [r15], 8 /* Load the value in the old env. */\n" \
263 " st8 [r11] = r16, 8 /* Store it in the new env. */\n" \
264 " cmp.ne p6, p7 = 0, r16\n" \
265 "(p6) br.cond.dptk.few 1b\n" \
269 " st8 [r10] = out1 /* Record the new argc. */\n" \
270 " ld8 out0 = [out0] /* get the linkmap */\n" \
273 " st8 [r2] = r17 /* Load the new _dl_argv. */\n" \
274 " br.call.sptk.many b0 = _dl_init#\n" \
277 " /* Pass our finalizer function to the user,\n" \
278 " and jump to the user's entry point. */\n" \
280 " ld8 r3 = [loc2], 8\n" \
284 " addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n" \
289 " ld8 ret0 = [ret0]\n" \
290 " ld8 gp = [loc2]\n" \
291 " mov ar.pfs = loc0\n" \
295 " br.sptk.many b6\n" \
298 " .endp _dl_start_user#\n" \
302 #ifndef RTLD_START_SPECIAL_INIT
303 #define RTLD_START_SPECIAL_INIT /* nothing */
306 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS
307 variable, so undefined references should not be allowed to define the
309 ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
310 of the main executable's symbols, as for a COPY reloc, which we don't
312 /* ??? Ignore *MSB for now. */
313 #define elf_machine_type_class(type) \
314 (((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB \
315 || (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB) \
316 * ELF_RTYPE_CLASS_PLT)
318 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
319 #define ELF_MACHINE_JMP_SLOT R_IA64_IPLTLSB
321 /* According to the IA-64 specific documentation, Rela is always used. */
322 #define ELF_MACHINE_NO_REL 1
323 #define ELF_MACHINE_NO_RELA 0
325 /* Return the address of the entry point. */
326 #define ELF_MACHINE_START_ADDRESS(map, start) \
329 DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
333 /* Fixup a PLT entry to bounce directly to the function at VALUE. */
334 static inline struct fdesc __attribute__ ((always_inline))
335 elf_machine_fixup_plt (struct link_map *l, lookup_t t,
336 const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
337 const Elf64_Rela *reloc,
338 Elf64_Addr *reloc_addr, struct fdesc value)
340 /* l is the link_map for the caller, t is the link_map for the object
342 /* got has already been relocated in elf_get_dynamic_info() */
343 reloc_addr[1] = value.gp;
344 /* we need a "release" here to ensure that the gp is visible before
345 the code entry point is updated: */
346 ((volatile Elf64_Addr *) reloc_addr)[0] = value.ip;
350 /* Return the final value of a plt relocation. */
351 static inline struct fdesc
352 elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
355 /* No need to handle rel vs rela since IA64 is rela only */
356 return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
359 #endif /* !dl_machine_h */
363 #define R_IA64_TYPE(R) ((R) & -8)
364 #define R_IA64_FORMAT(R) ((R) & 7)
366 #define R_IA64_FORMAT_32MSB 4
367 #define R_IA64_FORMAT_32LSB 5
368 #define R_IA64_FORMAT_64MSB 6
369 #define R_IA64_FORMAT_64LSB 7
372 /* Perform the relocation specified by RELOC and SYM (which is fully
373 resolved). MAP is the object containing the reloc. */
375 __attribute ((always_inline))
376 elf_machine_rela (struct link_map *map,
377 const Elf64_Rela *reloc,
378 const Elf64_Sym *sym,
379 const struct r_found_version *version,
380 void *const reloc_addr_arg,
383 Elf64_Addr *const reloc_addr = reloc_addr_arg;
384 const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
387 #if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED
388 /* This is defined in rtld.c, but nowhere in the static libc.a; make the
389 reference weak so static programs can still link. This declaration
390 cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
391 because rtld.c contains the common defn for _dl_rtld_map, which is
392 incompatible with a weak decl in the same file. */
393 weak_extern (_dl_rtld_map);
396 /* We cannot use a switch here because we cannot locate the switch
397 jump table until we've self-relocated. */
399 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
400 if (__builtin_expect (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB),
403 assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
405 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
406 /* Already done in dynamic linker. */
407 if (map != &GL(dl_rtld_map))
409 value += map->l_addr;
413 if (__builtin_expect (r_type == R_IA64_NONE, 0))
417 struct link_map *sym_map;
419 /* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */
420 if ((sym_map = RESOLVE_MAP (&sym, version, r_type)))
422 value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
424 if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB))
425 ;/* No adjustment. */
426 else if (r_type == R_IA64_IPLTLSB)
428 elf_machine_fixup_plt (NULL, NULL, NULL, NULL, reloc, reloc_addr,
429 DL_FIXUP_MAKE_VALUE (sym_map, value));
432 else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB))
433 value = _dl_make_fptr (sym_map, sym, value);
434 else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB))
435 value -= (Elf64_Addr) reloc_addr & -16;
436 else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPMOD64LSB))
437 #ifdef RTLD_BOOTSTRAP
438 /* During startup the dynamic linker is always index 1. */
441 /* Get the information from the link map returned by the
443 value = sym_map->l_tls_modid;
444 else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DTPREL64LSB))
445 value -= sym_map->l_addr;
447 else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_TPREL64LSB))
449 #ifndef RTLD_BOOTSTRAP
450 CHECK_STATIC_TLS (map, sym_map);
452 value += sym_map->l_tls_offset - sym_map->l_addr;
455 _dl_reloc_bad_type (map, r_type, 0);
461 /* ??? Ignore MSB and Instruction format for now. */
462 if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB)
464 else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB)
465 *(int *) reloc_addr = value;
466 else if (r_type == R_IA64_IPLTLSB)
472 _dl_reloc_bad_type (map, r_type, 0);
475 /* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
477 #define ELF_MACHINE_REL_RELATIVE 1
480 __attribute ((always_inline))
481 elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
482 void *const reloc_addr_arg)
484 Elf64_Addr *const reloc_addr = reloc_addr_arg;
485 /* ??? Ignore MSB and Instruction format for now. */
486 assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
488 *reloc_addr += l_addr;
491 /* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
493 __attribute ((always_inline))
494 elf_machine_lazy_rel (struct link_map *map,
495 Elf64_Addr l_addr, const Elf64_Rela *reloc,
498 Elf64_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
499 const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
501 if (r_type == R_IA64_IPLTLSB)
503 reloc_addr[0] += l_addr;
504 reloc_addr[1] += l_addr;
506 else if (r_type == R_IA64_NONE)
509 _dl_reloc_bad_type (map, r_type, 1);
512 #endif /* RESOLVE_MAP */