(getsourcefilter): Free memory if socket level value cannot be retrieved.
[kopensolaris-gnu/glibc.git] / sysdeps / ia64 / dl-machine.h
1 /* Machine-dependent ELF dynamic relocation inline functions.  IA-64 version.
2    Copyright (C) 1995-1997, 2000-2004, 2005 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4
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.
9
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.
14
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, write to the Free
17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18    02111-1307 USA.  */
19
20 #ifndef dl_machine_h
21 #define dl_machine_h 1
22
23 #define ELF_MACHINE_NAME "ia64"
24
25 #include <assert.h>
26 #include <string.h>
27 #include <link.h>
28 #include <errno.h>
29 #include <dl-fptr.h>
30 #include <tls.h>
31
32 /* Translate a processor specific dynamic tag to the index
33    in l_info array.  */
34 #define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
35
36 static inline void __attribute__ ((always_inline))
37 __ia64_init_bootstrap_fdesc_table (struct link_map *map)
38 {
39   Elf64_Addr *boot_table;
40
41   /* careful: this will be called before got has been relocated... */
42   asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table));
43
44   map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
45   map->l_mach.fptr_table = boot_table;
46 }
47
48 #define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info)             \
49         __ia64_init_bootstrap_fdesc_table (&bootstrap_map);
50
51 /* Return nonzero iff ELF header is compatible with the running host.  */
52 static inline int __attribute__ ((unused))
53 elf_machine_matches_host (const Elf64_Ehdr *ehdr)
54 {
55   return ehdr->e_machine == EM_IA_64;
56 }
57
58
59 /* Return the link-time address of _DYNAMIC.  */
60 static inline Elf64_Addr __attribute__ ((unused, const))
61 elf_machine_dynamic (void)
62 {
63   Elf64_Addr *p;
64
65   __asm__ (
66         ".section .sdata\n"
67         "       .type __dynamic_ltv#, @object\n"
68         "       .size __dynamic_ltv#, 8\n"
69         "__dynamic_ltv:\n"
70         "       data8   @ltv(_DYNAMIC#)\n"
71         ".previous\n"
72         "       addl    %0 = @gprel(__dynamic_ltv#), gp ;;"
73         : "=r" (p));
74
75   return *p;
76 }
77
78
79 /* Return the run-time load address of the shared object.  */
80 static inline Elf64_Addr __attribute__ ((unused))
81 elf_machine_load_address (void)
82 {
83   Elf64_Addr ip;
84   int *p;
85
86   __asm__ (
87         "1:     mov %0 = ip\n"
88         ".section .sdata\n"
89         "2:     data4   @ltv(1b)\n"
90         "       .align 8\n"
91         ".previous\n"
92         "       addl    %1 = @gprel(2b), gp ;;"
93         : "=r" (ip), "=r" (p));
94
95   return ip - (Elf64_Addr) *p;
96 }
97
98 /* Set up the loaded object described by L so its unrelocated PLT
99    entries will jump to the on-demand fixup code in dl-runtime.c.  */
100
101 static inline int __attribute__ ((unused, always_inline))
102 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
103 {
104   extern void _dl_runtime_resolve (void);
105   extern void _dl_runtime_profile (void);
106
107   if (lazy)
108     {
109       register Elf64_Addr gp __asm__ ("gp");
110       Elf64_Addr *reserve, doit;
111
112       /*
113        * Careful with the typecast here or it will try to add l-l_addr
114        * pointer elements
115        */
116       reserve = ((Elf64_Addr *)
117                  (l->l_info[DT_IA_64 (PLT_RESERVE)]->d_un.d_ptr + l->l_addr));
118       /* Identify this shared object.  */
119       reserve[0] = (Elf64_Addr) l;
120
121       /* This function will be called to perform the relocation.  */
122       if (!profile)
123         doit = (Elf64_Addr) ((struct fdesc *) &_dl_runtime_resolve)->ip;
124       else
125         {
126           if (GLRO(dl_profile) != NULL
127               && _dl_name_match_p (GLRO(dl_profile), l))
128             {
129               /* This is the object we are looking for.  Say that we really
130                  want profiling and the timers are started.  */
131               GL(dl_profile_map) = l;
132             }
133           doit = (Elf64_Addr) ((struct fdesc *) &_dl_runtime_profile)->ip;
134         }
135
136       reserve[1] = doit;
137       reserve[2] = gp;
138     }
139
140   return lazy;
141 }
142
143 /* Names of the architecture-specific auditing callback functions.  */
144 #define ARCH_LA_PLTENTER ia64_gnu_pltenter
145 #define ARCH_LA_PLTEXIT ia64_gnu_pltexit
146
147 /* Undo the adds out0 = 16, sp below to get at the value we want in
148    __libc_stack_end.  */
149 #define DL_STACK_END(cookie) \
150   ((void *) (((long) (cookie)) - 16))
151
152 /* Initial entry point code for the dynamic linker.
153    The C function `_dl_start' is the real entry point;
154    its return value is the user program's entry point.  */
155
156 #define RTLD_START asm (                                                      \
157 ".text\n"                                                                     \
158 "       .global _start#\n"                                                    \
159 "       .proc _start#\n"                                                      \
160 "_start:\n"                                                                   \
161 "0:     { .mii\n"                                                             \
162 "         .prologue\n"                                                        \
163 "         .save rp, r0\n"                                                     \
164 "         .body\n"                                                            \
165 "         .prologue\n"                                                        \
166 "         .save ar.pfs, r32\n"                                                \
167 "         alloc loc0 = ar.pfs, 0, 3, 4, 0\n"                                  \
168 "         .body\n"                                                            \
169 "         mov r2 = ip\n"                                                      \
170 "         addl r3 = @gprel(0b), r0\n"                                         \
171 "         ;;\n"                                                               \
172 "       }\n"                                                                  \
173 "       { .mlx\n"                                                             \
174 "         /* Calculate the GP, and save a copy in loc1.  */\n"                \
175 "         sub gp = r2, r3\n"                                                  \
176 "         movl r8 = 0x9804c0270033f\n"                                        \
177 "         ;;\n"                                                               \
178 "       }\n"                                                                  \
179 "       { .mii\n"                                                             \
180 "         mov ar.fpsr = r8\n"                                                 \
181 "         sub loc1 = r2, r3\n"                                                \
182 "         /* _dl_start wants a pointer to the pointer to the arg block and\n" \
183 "            the arg block starts with an integer, thus the magic 16. */\n"   \
184 "         adds out0 = 16, sp\n"                                               \
185 "       }\n"                                                                  \
186 "       { .bbb\n"                                                             \
187 "         br.call.sptk.many b0 = _dl_start#\n"                                \
188 "         ;;\n"                                                               \
189 "       }\n"                                                                  \
190 "       .endp _start#\n"                                                      \
191 "       /* FALLTHRU */\n"                                                     \
192 "       .global _dl_start_user#\n"                                            \
193 "       .proc _dl_start_user#\n"                                              \
194 "_dl_start_user:\n"                                                           \
195 "        .prologue\n"                                                         \
196 "        .save rp, r0\n"                                                      \
197 "         .body\n"                                                            \
198 "        .prologue\n"                                                         \
199 "        .save ar.pfs, r32\n"                                                 \
200 "        .body\n"                                                             \
201 "       { .mii\n"                                                             \
202 "         addl r3 = @gprel(_dl_skip_args), gp\n"                              \
203 "         adds r11 = 24, sp     /* Load the address of argv. */\n"            \
204 "         /* Save the pointer to the user entry point fptr in loc2.  */\n"    \
205 "         mov loc2 = ret0\n"                                                  \
206 "         ;;\n"                                                               \
207 "       }\n"                                                                  \
208 "       { .mii\n"                                                             \
209 "         ld4 r3 = [r3]\n"                                                    \
210 "         adds r10 = 16, sp     /* Load the address of argc. */\n"            \
211 "         mov out2 = r11\n"                                                   \
212 "         ;;\n"                                                               \
213 "         /* See if we were run as a command with the executable file\n"      \
214 "            name as an extra leading argument.  If so, adjust the argv\n"    \
215 "            pointer to skip _dl_skip_args words.\n"                          \
216 "            Note that _dl_skip_args is an integer, not a long - Jes\n"       \
217 "\n"                                                                          \
218 "            The stack pointer has to be 16 byte aligned. We cannot simply\n" \
219 "            addjust the stack pointer. We have to move the whole argv and\n" \
220 "            envp and adjust _dl_argv by _dl_skip_args.  H.J.  */\n"          \
221 "       }\n"                                                                  \
222 "       { .mib\n"                                                             \
223 "         ld8 out1 = [r10]      /* is argc actually stored as a long\n"       \
224 "                                  or as an int? */\n"                        \
225 "         addl r2 = @ltoff(_dl_argv), gp\n"                                   \
226 "         ;;\n"                                                               \
227 "       }\n"                                                                  \
228 "       { .mmi\n"                                                             \
229 "         ld8 r2 = [r2]         /* Get the address of _dl_argv. */\n"         \
230 "         sub out1 = out1, r3   /* Get the new argc. */\n"                    \
231 "         shladd r3 = r3, 3, r0\n"                                            \
232 "         ;;\n"                                                               \
233 "       }\n"                                                                  \
234 "       {\n"                                                                  \
235 "         .mib\n"                                                             \
236 "         ld8 r17 = [r2]        /* Get _dl_argv. */\n"                        \
237 "         add r15 = r11, r3     /* The address of the argv we move */\n"      \
238 "         ;;\n"                                                               \
239 "       }\n"                                                                  \
240 "       /* ??? Could probably merge these two loops into 3 bundles.\n"        \
241 "          using predication to control which set of copies we're on.  */\n"  \
242 "1:     /* Copy argv. */\n"                                                   \
243 "       { .mfi\n"                                                             \
244 "         ld8 r16 = [r15], 8    /* Load the value in the old argv. */\n"      \
245 "         ;;\n"                                                               \
246 "       }\n"                                                                  \
247 "       { .mib\n"                                                             \
248 "         st8 [r11] = r16, 8    /* Store it in the new argv. */\n"            \
249 "         cmp.ne p6, p7 = 0, r16\n"                                           \
250 "(p6)     br.cond.dptk.few 1b\n"                                              \
251 "         ;;\n"                                                               \
252 "       }\n"                                                                  \
253 "       { .mmi\n"                                                             \
254 "         mov out3 = r11\n"                                                   \
255 "         sub r17 = r17, r3     /* Substract _dl_skip_args. */\n"             \
256 "         addl out0 = @gprel(_rtld_local), gp\n"                              \
257 "       }\n"                                                                  \
258 "1:     /* Copy env. */\n"                                                    \
259 "       { .mfi\n"                                                             \
260 "         ld8 r16 = [r15], 8    /* Load the value in the old env. */\n"       \
261 "         ;;\n"                                                               \
262 "       }\n"                                                                  \
263 "       { .mib\n"                                                             \
264 "         st8 [r11] = r16, 8    /* Store it in the new env. */\n"             \
265 "         cmp.ne p6, p7 = 0, r16\n"                                           \
266 "(p6)     br.cond.dptk.few 1b\n"                                              \
267 "         ;;\n"                                                               \
268 "       }\n"                                                                  \
269 "       { .mmb\n"                                                             \
270 "         st8 [r10] = out1              /* Record the new argc. */\n"         \
271 "         ld8 out0 = [out0]             /* get the linkmap */\n"              \
272 "       }\n"                                                                  \
273 "       { .mmb\n"                                                             \
274 "         st8 [r2] = r17                /* Load the new _dl_argv. */\n"       \
275 "         br.call.sptk.many b0 = _dl_init_internal#\n"                        \
276 "         ;;\n"                                                               \
277 "       }\n"                                                                  \
278 "       /* Pass our finalizer function to the user,\n"                        \
279 "          and jump to the user's entry point.  */\n"                         \
280 "       { .mmi\n"                                                             \
281 "         ld8 r3 = [loc2], 8\n"                                               \
282 "         mov b0 = r0\n"                                                      \
283 "       }\n"                                                                  \
284 "       { .mmi\n"                                                             \
285 "         addl ret0 = @ltoff(@fptr(_dl_fini#)), gp\n"                         \
286 "         ;;\n"                                                               \
287 "         mov b6 = r3\n"                                                      \
288 "       }\n"                                                                  \
289 "       { .mmi\n"                                                             \
290 "         ld8 ret0 = [ret0]\n"                                                \
291 "         ld8 gp = [loc2]\n"                                                  \
292 "         mov ar.pfs = loc0\n"                                                \
293 "         ;;\n"                                                               \
294 "       }\n"                                                                  \
295 "       { .mfb\n"                                                             \
296 "         br.sptk.many b6\n"                                                  \
297 "         ;;\n"                                                               \
298 "       }\n"                                                                  \
299 "       .endp _dl_start_user#\n"                                              \
300 ".previous\n");
301
302
303 #ifndef RTLD_START_SPECIAL_INIT
304 #define RTLD_START_SPECIAL_INIT /* nothing */
305 #endif
306
307 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or TLS
308    variable, so undefined references should not be allowed to define the
309    value.
310    ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
311    of the main executable's symbols, as for a COPY reloc, which we don't
312    use.  */
313 /* ??? Ignore *MSB for now.  */
314 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
315 #define elf_machine_type_class(type) \
316   (((type) == R_IA64_IPLTLSB || (type) == R_IA64_DTPMOD64LSB                  \
317     || (type) == R_IA64_DTPREL64LSB || (type) == R_IA64_TPREL64LSB)           \
318    * ELF_RTYPE_CLASS_PLT)
319 #else
320 #define elf_machine_type_class(type) \
321   (((type) == R_IA64_IPLTLSB) * ELF_RTYPE_CLASS_PLT)
322 #endif
323
324 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
325 #define ELF_MACHINE_JMP_SLOT     R_IA64_IPLTLSB
326
327 /* According to the IA-64 specific documentation, Rela is always used.  */
328 #define ELF_MACHINE_NO_REL 1
329
330 /* Return the address of the entry point. */
331 #define ELF_MACHINE_START_ADDRESS(map, start)   \
332   DL_STATIC_FUNCTION_ADDRESS (map, start)
333
334 /* Fixup a PLT entry to bounce directly to the function at VALUE.  */
335 static inline struct fdesc __attribute__ ((always_inline))
336 elf_machine_fixup_plt (struct link_map *l, lookup_t t,
337                        const Elf64_Rela *reloc,
338                        Elf64_Addr *reloc_addr, struct fdesc value)
339 {
340   /* l is the link_map for the caller, t is the link_map for the object
341    * being called */
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;
347   return value;
348 }
349
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,
353                        struct fdesc value)
354 {
355   /* No need to handle rel vs rela since IA64 is rela only */
356   return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
357 }
358
359 #endif /* !dl_machine_h */
360
361 #ifdef RESOLVE_MAP
362
363 #define R_IA64_TYPE(R)   ((R) & -8)
364 #define R_IA64_FORMAT(R) ((R) & 7)
365
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
370
371
372 /* Perform the relocation specified by RELOC and SYM (which is fully
373    resolved).  MAP is the object containing the reloc.  */
374 auto inline void
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)
381 {
382   Elf64_Addr *const reloc_addr = reloc_addr_arg;
383   const unsigned long int r_type = ELF64_R_TYPE (reloc->r_info);
384   Elf64_Addr value;
385
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);
393 #endif
394
395   /* We cannot use a switch here because we cannot locate the switch
396      jump table until we've self-relocated.  */
397
398 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
399   if (__builtin_expect (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_REL64LSB),
400                         0))
401     {
402       assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
403       value = *reloc_addr;
404 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
405       /* Already done in dynamic linker.  */
406       if (map != &GL(dl_rtld_map))
407 # endif
408         value += map->l_addr;
409     }
410   else
411 #endif
412     if (__builtin_expect (r_type == R_IA64_NONE, 0))
413       return;
414   else
415     {
416       struct link_map *sym_map;
417
418       /* RESOLVE_MAP() will return NULL if it fail to locate the symbol.  */
419       if ((sym_map = RESOLVE_MAP (&sym, version, r_type)))
420         {
421           value = sym_map->l_addr + sym->st_value + reloc->r_addend;
422
423           if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_DIR64LSB))
424             ;/* No adjustment.  */
425           else if (r_type == R_IA64_IPLTLSB)
426             {
427               elf_machine_fixup_plt (NULL, NULL, reloc, reloc_addr,
428                                      DL_FIXUP_MAKE_VALUE (sym_map, value));
429               return;
430             }
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 #if defined USE_TLS && (!defined RTLD_BOOTSTRAP || defined USE___THREAD)
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.  */
439             value = 1;
440 # else
441             /* Get the information from the link map returned by the
442                resolv function.  */
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;
446 # endif
447           else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_TPREL64LSB))
448             {
449 # ifndef RTLD_BOOTSTRAP
450               CHECK_STATIC_TLS (map, sym_map);
451 # endif
452               value += sym_map->l_tls_offset - sym_map->l_addr;
453             }
454 #endif
455           else
456             _dl_reloc_bad_type (map, r_type, 0);
457         }
458       else
459         value = 0;
460     }
461
462   /* ??? Ignore MSB and Instruction format for now.  */
463   if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_64LSB)
464     *reloc_addr = value;
465   else if (R_IA64_FORMAT (r_type) == R_IA64_FORMAT_32LSB)
466     *(int *) reloc_addr = value;
467   else if (r_type == R_IA64_IPLTLSB)
468     {
469       reloc_addr[0] = 0;
470       reloc_addr[1] = 0;
471     }
472   else
473     _dl_reloc_bad_type (map, r_type, 0);
474 }
475
476 /* Let do-rel.h know that on IA-64 if l_addr is 0, all RELATIVE relocs
477    can be skipped.  */
478 #define ELF_MACHINE_REL_RELATIVE 1
479
480 auto inline void
481 __attribute ((always_inline))
482 elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
483                            void *const reloc_addr_arg)
484 {
485   Elf64_Addr *const reloc_addr = reloc_addr_arg;
486   /* ??? Ignore MSB and Instruction format for now.  */
487   assert (ELF64_R_TYPE (reloc->r_info) == R_IA64_REL64LSB);
488
489   *reloc_addr += l_addr;
490 }
491
492 /* Perform a RELATIVE reloc on the .got entry that transfers to the .plt.  */
493 auto inline void
494 __attribute ((always_inline))
495 elf_machine_lazy_rel (struct link_map *map,
496                       Elf64_Addr l_addr, const Elf64_Rela *reloc)
497 {
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);
500
501   if (r_type == R_IA64_IPLTLSB)
502     {
503       reloc_addr[0] += l_addr;
504       reloc_addr[1] += l_addr;
505     }
506   else if (r_type == R_IA64_NONE)
507     return;
508   else
509     _dl_reloc_bad_type (map, r_type, 1);
510 }
511
512 #endif /* RESOLVE_MAP */