1 /* Machine-dependent ELF dynamic relocation inline functions. IA-64 version.
2 Copyright (C) 1995-2024 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"
30 #include <dl-static-tls.h>
31 #include <dl-machine-rel.h>
33 /* Translate a processor specific dynamic tag to the index
35 #define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
37 static inline void __attribute__ ((always_inline
))
38 __ia64_init_bootstrap_fdesc_table (struct link_map
*map
)
40 Elf64_Addr
*boot_table
;
42 /* careful: this will be called before got has been relocated... */
43 asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table
));
45 map
->l_mach
.fptr_table_len
= ELF_MACHINE_BOOT_FPTR_TABLE_LEN
;
46 map
->l_mach
.fptr_table
= boot_table
;
49 #define ELF_MACHINE_BEFORE_RTLD_RELOC(map, dynamic_info) \
50 __ia64_init_bootstrap_fdesc_table (map);
52 /* Return nonzero iff ELF header is compatible with the running host. */
53 static inline int __attribute__ ((unused
))
54 elf_machine_matches_host (const Elf64_Ehdr
*ehdr
)
56 return ehdr
->e_machine
== EM_IA_64
;
60 /* Return the link-time address of _DYNAMIC. */
61 static inline Elf64_Addr
__attribute__ ((unused
, const))
62 elf_machine_dynamic (void)
68 " .type __dynamic_ltv#, @object\n"
69 " .size __dynamic_ltv#, 8\n"
71 " data8 @ltv(_DYNAMIC#)\n"
73 " addl %0 = @gprel(__dynamic_ltv#), gp ;;"
80 /* Return the run-time load address of the shared object. */
81 static inline Elf64_Addr
__attribute__ ((unused
))
82 elf_machine_load_address (void)
93 " addl %1 = @gprel(2b), gp ;;"
94 : "=r" (ip
), "=r" (p
));
96 return ip
- (Elf64_Addr
) *p
;
99 /* Set up the loaded object described by L so its unrelocated PLT
100 entries will jump to the on-demand fixup code in dl-runtime.c. */
102 static inline int __attribute__ ((unused
, always_inline
))
103 elf_machine_runtime_setup (struct link_map
*l
, struct r_scope_elem
*scope
[],
104 int lazy
, int profile
)
106 extern void _dl_runtime_resolve (void);
107 extern void _dl_runtime_profile (void);
111 register Elf64_Addr gp
__asm__ ("gp");
112 Elf64_Addr
*reserve
, doit
;
115 * Careful with the typecast here or it will try to add l-l_addr
118 reserve
= ((Elf64_Addr
*)
119 (l
->l_info
[DT_IA_64 (PLT_RESERVE
)]->d_un
.d_ptr
+ l
->l_addr
));
120 /* Identify this shared object. */
121 reserve
[0] = (Elf64_Addr
) l
;
123 /* This function will be called to perform the relocation. */
125 if (__glibc_unlikely (profile
))
127 if (GLRO(dl_profile
) != NULL
128 && _dl_name_match_p (GLRO(dl_profile
), l
))
130 /* This is the object we are looking for. Say that we really
131 want profiling and the timers are started. */
132 GL(dl_profile_map
) = l
;
134 doit
= (Elf64_Addr
) ELF_PTR_TO_FDESC (&_dl_runtime_profile
)->ip
;
139 doit
= (Elf64_Addr
) ELF_PTR_TO_FDESC (&_dl_runtime_resolve
)->ip
;
149 /* Names of the architecture-specific auditing callback functions. */
150 #define ARCH_LA_PLTENTER ia64_gnu_pltenter
151 #define ARCH_LA_PLTEXIT ia64_gnu_pltexit
153 /* Undo the adds out0 = 16, sp below to get at the value we want in
155 #define DL_STACK_END(cookie) \
156 ((void *) (((long) (cookie)) - 16))
158 /* Initial entry point code for the dynamic linker.
159 The C function `_dl_start' is the real entry point;
160 its return value is the user program's entry point. */
162 #define RTLD_START asm ( \
164 " .global _start#\n" \
172 " .save ar.pfs, r32\n" \
173 " alloc loc0 = ar.pfs, 0, 3, 4, 0\n" \
176 " addl r3 = @gprel(0b), r0\n" \
180 " /* Calculate the GP, and save a copy in loc1. */\n" \
181 " sub gp = r2, r3\n" \
182 " movl r8 = 0x9804c0270033f\n" \
186 " mov ar.fpsr = r8\n" \
187 " sub loc1 = r2, r3\n" \
188 " /* _dl_start wants a pointer to the pointer to the arg block and\n" \
189 " the arg block starts with an integer, thus the magic 16. */\n" \
190 " adds out0 = 16, sp\n" \
193 " br.call.sptk.many b0 = _dl_start#\n" \
197 " /* FALLTHRU */\n" \
198 " .global _dl_start_user#\n" \
199 " .proc _dl_start_user#\n" \
200 "_dl_start_user:\n" \
205 " .save ar.pfs, r32\n" \
208 " /* Save the pointer to the user entry point fptr in loc2. */\n" \
209 " mov loc2 = ret0\n" \
210 " addl r2 = @ltoff(_dl_argc), gp\n" \
214 " ld8 out1 = [r2] /* Get the _dl_argc address. */\n" \
215 " addl r3 = @ltoff(_dl_argv), gp\n" \
219 " ld8 out2 = [r3] /* Get the _dl_argv address. */\n" \
220 " ld8 out1 = [out1] /* Get the adjusted _dl_argc. */\n" \
221 " addl r2 = @gprel(_rtld_local), gp\n" \
225 " sxt4 out3 = out1 /* envp = argv + argc + 1 */\n" \
229 " adds out3 = 1, out3\n" \
233 " ld8 out2 = [out2] /* Get the adjusted _dl_argv. */\n" \
234 " shladd out3 = out3, 3, r0\n" \
238 " add out3 = out3, out2\n" \
239 " ld8 out0 = [r2] /* Get the linkmap. */\n" \
240 " br.call.sptk.many b0 = _dl_init#\n" \
242 " /* Pass our finalizer function to the user,\n" \
243 " and jump to the user's entry point. */\n" \
245 " ld8 r3 = [loc2], 8\n" \
249 " addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n" \
254 " ld8 ret0 = [ret0]\n" \
255 " ld8 gp = [loc2]\n" \
256 " mov ar.pfs = loc0\n" \
260 " br.sptk.many b6\n" \
263 " .endp _dl_start_user#\n" \
267 #ifndef RTLD_START_SPECIAL_INIT
268 #define RTLD_START_SPECIAL_INIT /* nothing */
271 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS
272 variable, so undefined references should not be allowed to define the
274 ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
275 of the main executable's symbols, as for a COPY reloc, which we don't
277 /* ??? Ignore *MSB for now. */
278 #define elf_machine_type_class(type) \
279 (((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB \
280 || (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB) \
281 * ELF_RTYPE_CLASS_PLT)
283 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
284 #define ELF_MACHINE_JMP_SLOT R_IA64_IPLTLSB
286 /* Return the address of the entry point. */
287 #define ELF_MACHINE_START_ADDRESS(map, start) \
290 DL_DT_FUNCTION_ADDRESS(map, start, static, addr) \
294 /* Fixup a PLT entry to bounce directly to the function at VALUE. */
295 static inline struct fdesc
__attribute__ ((always_inline
))
296 elf_machine_fixup_plt (struct link_map
*l
, lookup_t t
,
297 const ElfW(Sym
) *refsym
, const ElfW(Sym
) *sym
,
298 const Elf64_Rela
*reloc
,
299 Elf64_Addr
*reloc_addr
, struct fdesc value
)
301 /* l is the link_map for the caller, t is the link_map for the object
303 /* got has already been relocated in elf_get_dynamic_info() */
304 reloc_addr
[1] = value
.gp
;
305 /* we need a "release" here to ensure that the gp is visible before
306 the code entry point is updated: */
307 ((volatile Elf64_Addr
*) reloc_addr
)[0] = value
.ip
;
311 /* Return the final value of a plt relocation. */
312 static inline struct fdesc
313 elf_machine_plt_value (struct link_map
*map
, const Elf64_Rela
*reloc
,
316 /* No need to handle rel vs rela since IA64 is rela only */
317 return (struct fdesc
) { value
.ip
+ reloc
->r_addend
, value
.gp
};
320 #endif /* !dl_machine_h */
324 #define R_IA64_TYPE(R) ((R) & -8)
325 #define R_IA64_FORMAT(R) ((R) & 7)
327 #define R_IA64_FORMAT_32MSB 4
328 #define R_IA64_FORMAT_32LSB 5
329 #define R_IA64_FORMAT_64MSB 6
330 #define R_IA64_FORMAT_64LSB 7
333 /* Perform the relocation specified by RELOC and SYM (which is fully
334 resolved). MAP is the object containing the reloc. */
336 __attribute ((always_inline
))
337 elf_machine_rela (struct link_map
*map
, struct r_scope_elem
*scope
[],
338 const Elf64_Rela
*reloc
,
339 const Elf64_Sym
*sym
,
340 const struct r_found_version
*version
,
341 void *const reloc_addr_arg
,
344 Elf64_Addr
*const reloc_addr
= reloc_addr_arg
;
345 const unsigned long int r_type
= ELF64_R_TYPE (reloc
->r_info
);
348 /* We cannot use a switch here because we cannot locate the switch
349 jump table until we've self-relocated. */
351 #if !defined RTLD_BOOTSTRAP
352 if (__builtin_expect (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_REL64LSB
),
355 assert (ELF64_R_TYPE (reloc
->r_info
) == R_IA64_REL64LSB
);
356 value
= *reloc_addr
+ map
->l_addr
;
360 if (__builtin_expect (r_type
== R_IA64_NONE
, 0))
364 struct link_map
*sym_map
= RESOLVE_MAP (map
, scope
, &sym
, version
,
367 /* RESOLVE_MAP() will return NULL if it fail to locate the symbol. */
370 value
= SYMBOL_ADDRESS (sym_map
, sym
, true) + reloc
->r_addend
;
372 if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DIR64LSB
))
373 ;/* No adjustment. */
374 else if (r_type
== R_IA64_IPLTLSB
)
376 elf_machine_fixup_plt (NULL
, NULL
, NULL
, NULL
, reloc
, reloc_addr
,
377 DL_FIXUP_MAKE_VALUE (sym_map
, value
));
380 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_FPTR64LSB
))
381 value
= _dl_make_fptr (sym_map
, sym
, value
);
382 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_PCREL64LSB
))
383 value
-= (Elf64_Addr
) reloc_addr
& -16;
384 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DTPMOD64LSB
))
385 #ifdef RTLD_BOOTSTRAP
386 /* During startup the dynamic linker is always index 1. */
389 /* Get the information from the link map returned by the
391 value
= sym_map
->l_tls_modid
;
392 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_DTPREL64LSB
))
393 value
-= sym_map
->l_addr
;
395 else if (R_IA64_TYPE (r_type
) == R_IA64_TYPE (R_IA64_TPREL64LSB
))
397 #ifndef RTLD_BOOTSTRAP
398 CHECK_STATIC_TLS (map
, sym_map
);
400 value
+= sym_map
->l_tls_offset
- sym_map
->l_addr
;
403 _dl_reloc_bad_type (map
, r_type
, 0);
409 /* ??? Ignore MSB and Instruction format for now. */
410 if (R_IA64_FORMAT (r_type
) == R_IA64_FORMAT_64LSB
)
412 else if (R_IA64_FORMAT (r_type
) == R_IA64_FORMAT_32LSB
)
413 *(int *) reloc_addr
= value
;
414 else if (r_type
== R_IA64_IPLTLSB
)
420 _dl_reloc_bad_type (map
, r_type
, 0);
423 /* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
425 #define ELF_MACHINE_REL_RELATIVE 1
428 __attribute ((always_inline
))
429 elf_machine_rela_relative (Elf64_Addr l_addr
, const Elf64_Rela
*reloc
,
430 void *const reloc_addr_arg
)
432 Elf64_Addr
*const reloc_addr
= reloc_addr_arg
;
433 /* ??? Ignore MSB and Instruction format for now. */
434 assert (ELF64_R_TYPE (reloc
->r_info
) == R_IA64_REL64LSB
);
436 *reloc_addr
+= l_addr
;
439 /* Perform a RELATIVE reloc on the .got entry that transfers to the .plt. */
441 __attribute ((always_inline
))
442 elf_machine_lazy_rel (struct link_map
*map
, struct r_scope_elem
*scope
[],
443 Elf64_Addr l_addr
, const Elf64_Rela
*reloc
,
446 Elf64_Addr
*const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
447 const unsigned long int r_type
= ELF64_R_TYPE (reloc
->r_info
);
449 if (r_type
== R_IA64_IPLTLSB
)
451 reloc_addr
[0] += l_addr
;
452 reloc_addr
[1] += l_addr
;
454 else if (r_type
== R_IA64_NONE
)
457 _dl_reloc_bad_type (map
, r_type
, 1);
460 #endif /* RESOLVE_MAP */