1 /* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
2 Copyright (C) 1995-2015 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 <http://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 Elf64_Rela
*reloc
,
337 Elf64_Addr
*reloc_addr
, struct fdesc value
)
339 /* l is the link_map for the caller, t is the link_map for the object
341 /* got has already been relocated in elf_get_dynamic_info() */
342 reloc_addr
[1] = value
.gp
;
343 /* we need a "release" here to ensure that the gp is visible before
344 the code entry point is updated: */
345 ((volatile Elf64_Addr
*) reloc_addr
)[0] = value
.ip
;
349 /* Return the final value of a plt relocation. */
350 static inline struct fdesc
351 elf_machine_plt_value (struct link_map
*map
, const Elf64_Rela
*reloc
,
354 /* No need to handle rel vs rela since IA64 is rela only */
355 return (struct fdesc
) { value
.ip
+ reloc
->r_addend
, value
.gp
};
358 #endif /* !dl_machine_h */
362 #define R_IA64_TYPE(R) ((R) & -8)
363 #define R_IA64_FORMAT(R) ((R) & 7)
365 #define R_IA64_FORMAT_32MSB 4
366 #define R_IA64_FORMAT_32LSB 5
367 #define R_IA64_FORMAT_64MSB 6
368 #define R_IA64_FORMAT_64LSB 7
371 /* Perform the relocation specified by RELOC and SYM (which is fully
372 resolved). MAP is the object containing the reloc. */
374 __attribute ((always_inline
))
375 elf_machine_rela (struct link_map
*map
,
376 const Elf64_Rela
*reloc
,
377 const Elf64_Sym
*sym
,
378 const struct r_found_version
*version
,
379 void *const reloc_addr_arg
,
382 Elf64_Addr
*const reloc_addr
= reloc_addr_arg
;
383 const unsigned long int r_type
= ELF64_R_TYPE (reloc
->r_info
);
386 #if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC && !defined SHARED
387 /* This is defined in rtld.c, but nowhere in the static libc.a; make the
388 reference weak so static programs can still link. This declaration
389 cannot be done when compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP)
390 because rtld.c contains the common defn for _dl_rtld_map, which is
391 incompatible with a weak decl in the same file. */
392 weak_extern (_dl_rtld_map
);
395 /* We cannot use a switch here because we cannot locate the switch
396 jump table until we've self-relocated. */
398 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
399 if (__builtin_expect (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_REL64LSB
),
402 assert (ELF64_R_TYPE (reloc
->r_info
) == R_IA64_REL64LSB
);
404 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
405 /* Already done in dynamic linker. */
406 if (map
!= &GL(dl_rtld_map
))
408 value
+= map
->l_addr
;
412 if (__builtin_expect (r_type
== R_IA64_NONE
, 0))
416 struct link_map
*sym_map
;
418 /* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */
419 if ((sym_map
= RESOLVE_MAP (&sym
, version
, r_type
)))
421 value
= sym_map
->l_addr
+ sym
->st_value
+ reloc
->r_addend
;
423 if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DIR64LSB
))
424 ;/* No adjustment. */
425 else if (r_type
== R_IA64_IPLTLSB
)
427 elf_machine_fixup_plt (NULL
, NULL
, reloc
, reloc_addr
,
428 DL_FIXUP_MAKE_VALUE (sym_map
, value
));
431 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_FPTR64LSB
))
432 value
= _dl_make_fptr (sym_map
, sym
, value
);
433 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_PCREL64LSB
))
434 value
-= (Elf64_Addr
) reloc_addr
& -16;
435 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DTPMOD64LSB
))
436 #ifdef RTLD_BOOTSTRAP
437 /* During startup the dynamic linker is always index 1. */
440 /* Get the information from the link map returned by the
442 value
= sym_map
->l_tls_modid
;
443 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DTPREL64LSB
))
444 value
-= sym_map
->l_addr
;
446 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_TPREL64LSB
))
448 #ifndef RTLD_BOOTSTRAP
449 CHECK_STATIC_TLS (map
, sym_map
);
451 value
+= sym_map
->l_tls_offset
- sym_map
->l_addr
;
454 _dl_reloc_bad_type (map
, r_type
, 0);
460 /* ??? Ignore MSB and Instruction format for now. */
461 if (R_IA64_FORMAT (r_type
) == R_IA64_FORMAT_64LSB
)
463 else if (R_IA64_FORMAT (r_type
) == R_IA64_FORMAT_32LSB
)
464 *(int *) reloc_addr
= value
;
465 else if (r_type
== R_IA64_IPLTLSB
)
471 _dl_reloc_bad_type (map
, r_type
, 0);
474 /* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
476 #define ELF_MACHINE_REL_RELATIVE 1
479 __attribute ((always_inline
))
480 elf_machine_rela_relative (Elf64_Addr l_addr
, const Elf64_Rela
*reloc
,
481 void *const reloc_addr_arg
)
483 Elf64_Addr
*const reloc_addr
= reloc_addr_arg
;
484 /* ??? Ignore MSB and Instruction format for now. */
485 assert (ELF64_R_TYPE (reloc
->r_info
) == R_IA64_REL64LSB
);
487 *reloc_addr
+= l_addr
;
490 /* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
492 __attribute ((always_inline
))
493 elf_machine_lazy_rel (struct link_map
*map
,
494 Elf64_Addr l_addr
, const Elf64_Rela
*reloc
,
497 Elf64_Addr
*const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
498 const unsigned long int r_type
= ELF64_R_TYPE (reloc
->r_info
);
500 if (r_type
== R_IA64_IPLTLSB
)
502 reloc_addr
[0] += l_addr
;
503 reloc_addr
[1] += l_addr
;
505 else if (r_type
== R_IA64_NONE
)
508 _dl_reloc_bad_type (map
, r_type
, 1);
511 #endif /* RESOLVE_MAP */