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Diffstat (limited to 'newlib/libc/sys/linux/dl/dynamic-link.h')
-rw-r--r--newlib/libc/sys/linux/dl/dynamic-link.h244
1 files changed, 244 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/dl/dynamic-link.h b/newlib/libc/sys/linux/dl/dynamic-link.h
new file mode 100644
index 0000000..a63fded
--- /dev/null
+++ b/newlib/libc/sys/linux/dl/dynamic-link.h
@@ -0,0 +1,244 @@
+/* Inline functions for dynamic linking.
+ Copyright (C) 1995,96,97,98,99,2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <elf.h>
+#include <machine/dl-machine.h>
+#include <assert.h>
+
+#ifndef VERSYMIDX
+# define VERSYMIDX(sym) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (sym))
+#endif
+
+
+/* Global read-only variable defined in rtld.c which is nonzero if we
+ shall give more warning messages. */
+extern int _dl_verbose __attribute__ ((unused));
+
+
+/* Read the dynamic section at DYN and fill in INFO with indices DT_*. */
+
+static inline void __attribute__ ((unused))
+elf_get_dynamic_info (struct link_map *l)
+{
+ ElfW(Dyn) *dyn = l->l_ld;
+ ElfW(Addr) l_addr;
+ ElfW(Dyn) **info;
+
+ if (! dyn)
+ return;
+
+ l_addr = l->l_addr;
+ info = l->l_info;
+
+ while (dyn->d_tag != DT_NULL)
+ {
+ if (dyn->d_tag < DT_NUM)
+ info[dyn->d_tag] = dyn;
+ else if (dyn->d_tag >= DT_LOPROC &&
+ dyn->d_tag < DT_LOPROC + DT_THISPROCNUM)
+ info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
+ else if ((Elf32_Word) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)
+ info[VERSYMIDX (dyn->d_tag)] = dyn;
+ else if ((Elf32_Word) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)
+ info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM
+ + DT_VERSIONTAGNUM] = dyn;
+ else
+ assert (! "bad dynamic tag");
+ ++dyn;
+ }
+#ifndef DL_RO_DYN_SECTION
+ if (info[DT_PLTGOT] != NULL)
+ info[DT_PLTGOT]->d_un.d_ptr += l_addr;
+ if (info[DT_STRTAB] != NULL)
+ info[DT_STRTAB]->d_un.d_ptr += l_addr;
+ if (info[DT_SYMTAB] != NULL)
+ info[DT_SYMTAB]->d_un.d_ptr += l_addr;
+# if ! ELF_MACHINE_NO_RELA
+ if (info[DT_RELA] != NULL)
+ {
+ assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela)));
+ info[DT_RELA]->d_un.d_ptr += l_addr;
+ }
+# endif
+# if ! ELF_MACHINE_NO_REL
+ if (info[DT_REL] != NULL)
+ {
+ assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel)));
+ info[DT_REL]->d_un.d_ptr += l_addr;
+ }
+# endif
+#endif
+ if (info[DT_PLTREL] != NULL)
+ {
+# if ELF_MACHINE_NO_RELA
+ assert (info[DT_PLTREL]->d_un.d_val == DT_REL);
+# elif ELF_MACHINE_NO_REL
+ assert (info[DT_PLTREL]->d_un.d_val == DT_RELA);
+# else
+ assert (info[DT_PLTREL]->d_un.d_val == DT_REL
+ || info[DT_PLTREL]->d_un.d_val == DT_RELA);
+# endif
+ }
+#ifndef DL_RO_DYN_SECTION
+ if (info[DT_JMPREL] != NULL)
+ info[DT_JMPREL]->d_un.d_ptr += l_addr;
+ if (info[VERSYMIDX (DT_VERSYM)] != NULL)
+ info[VERSYMIDX (DT_VERSYM)]->d_un.d_ptr += l_addr;
+#endif
+ if (info[DT_FLAGS] != NULL)
+ {
+ /* Flags are used. Translate to the old form where available.
+ Since these l_info entries are only tested for NULL pointers it
+ is ok if they point to the DT_FLAGS entry. */
+ ElfW(Word) flags = info[DT_FLAGS]->d_un.d_val;
+ if (flags & DF_SYMBOLIC)
+ info[DT_SYMBOLIC] = info[DT_FLAGS];
+ if (flags & DF_TEXTREL)
+ info[DT_TEXTREL] = info[DT_FLAGS];
+ if (flags & DF_BIND_NOW)
+ info[DT_BIND_NOW] = info[DT_FLAGS];
+ }
+ if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
+ l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
+ if (info[DT_RUNPATH] != NULL)
+ /* If both RUNPATH and RPATH are given, the latter is ignored. */
+ info[DT_RPATH] = NULL;
+}
+
+#ifdef RESOLVE
+
+/* Get the definitions of `elf_dynamic_do_rel' and `elf_dynamic_do_rela'.
+ These functions are almost identical, so we use cpp magic to avoid
+ duplicating their code. It cannot be done in a more general function
+ because we must be able to completely inline. */
+
+/* On some machines, notably SPARC, DT_REL* includes DT_JMPREL in its
+ range. Note that according to the ELF spec, this is completely legal!
+ But conditionally define things so that on machines we know this will
+ not happen we do something more optimal. */
+
+# ifdef ELF_MACHINE_PLTREL_OVERLAP
+# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, test_rel) \
+ do { \
+ struct { ElfW(Addr) start, size; int lazy; } ranges[3]; \
+ int ranges_index; \
+ \
+ ranges[0].lazy = ranges[2].lazy = 0; \
+ ranges[1].lazy = 1; \
+ ranges[0].size = ranges[1].size = ranges[2].size = 0; \
+ \
+ if ((map)->l_info[DT_##RELOC]) \
+ { \
+ ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]); \
+ ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
+ } \
+ \
+ if ((do_lazy) \
+ && (map)->l_info[DT_PLTREL] \
+ && (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \
+ { \
+ ranges[1].start = D_PTR ((map), l_info[DT_JMPREL]); \
+ ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
+ ranges[2].start = ranges[1].start + ranges[1].size; \
+ ranges[2].size = ranges[0].start + ranges[0].size - ranges[2].start; \
+ ranges[0].size = ranges[1].start - ranges[0].start; \
+ } \
+ \
+ for (ranges_index = 0; ranges_index < 3; ++ranges_index) \
+ elf_dynamic_do_##reloc ((map), \
+ ranges[ranges_index].start, \
+ ranges[ranges_index].size, \
+ ranges[ranges_index].lazy); \
+ } while (0)
+# else
+# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, test_rel) \
+ do { \
+ struct { ElfW(Addr) start, size; int lazy; } ranges[2]; \
+ int ranges_index; \
+ ranges[0].lazy = 0; \
+ ranges[0].size = ranges[1].size = 0; \
+ ranges[0].start = 0; \
+ \
+ if ((map)->l_info[DT_##RELOC]) \
+ { \
+ ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]); \
+ ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
+ } \
+ if ((map)->l_info[DT_PLTREL] \
+ && (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \
+ { \
+ ElfW(Addr) start = D_PTR ((map), l_info[DT_JMPREL]); \
+ \
+ if ((do_lazy) \
+ /* This test does not only detect whether the relocation \
+ sections are in the right order, it also checks whether \
+ there is a DT_REL/DT_RELA section. */ \
+ || ranges[0].start + ranges[0].size != start) \
+ { \
+ ranges[1].start = start; \
+ ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
+ ranges[1].lazy = (do_lazy); \
+ } \
+ else \
+ /* Combine processing the sections. */ \
+ ranges[0].size += (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
+ } \
+ \
+ for (ranges_index = 0; ranges_index < 2; ++ranges_index) \
+ elf_dynamic_do_##reloc ((map), \
+ ranges[ranges_index].start, \
+ ranges[ranges_index].size, \
+ ranges[ranges_index].lazy); \
+ } while (0)
+# endif
+
+# if ELF_MACHINE_NO_REL || ELF_MACHINE_NO_RELA
+# define _ELF_CHECK_REL 0
+# else
+# define _ELF_CHECK_REL 1
+# endif
+
+# if ! ELF_MACHINE_NO_REL
+# include "do-rel.h"
+# define ELF_DYNAMIC_DO_REL(map, lazy) \
+ _ELF_DYNAMIC_DO_RELOC (REL, rel, map, lazy, _ELF_CHECK_REL)
+# else
+# define ELF_DYNAMIC_DO_REL(map, lazy) /* Nothing to do. */
+# endif
+
+# if ! ELF_MACHINE_NO_RELA
+# define DO_RELA
+# include "do-rel.h"
+# define ELF_DYNAMIC_DO_RELA(map, lazy) \
+ _ELF_DYNAMIC_DO_RELOC (RELA, rela, map, lazy, _ELF_CHECK_REL)
+# else
+# define ELF_DYNAMIC_DO_RELA(map, lazy) /* Nothing to do. */
+# endif
+
+/* This can't just be an inline function because GCC is too dumb
+ to inline functions containing inlines themselves. */
+# define ELF_DYNAMIC_RELOCATE(map, lazy, consider_profile) \
+ do { \
+ int edr_lazy = elf_machine_runtime_setup ((map), (lazy), \
+ (consider_profile)); \
+ ELF_DYNAMIC_DO_REL ((map), edr_lazy); \
+ ELF_DYNAMIC_DO_RELA ((map), edr_lazy); \
+ } while (0)
+
+#endif