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688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
187 lines
6.1 KiB
C
187 lines
6.1 KiB
C
/* Read the dynamic section at DYN and fill in INFO with indices DT_*.
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Copyright (C) 2012-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This file is included multiple times and therefore lacks a header
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file inclusion guard. */
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#include <assert.h>
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#include <libc-diag.h>
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#ifndef RESOLVE_MAP
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static
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#else
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auto
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#endif
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inline void __attribute__ ((unused, always_inline))
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elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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{
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ElfW(Dyn) *dyn = l->l_ld;
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ElfW(Dyn) **info;
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#if __ELF_NATIVE_CLASS == 32
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typedef Elf32_Word d_tag_utype;
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#elif __ELF_NATIVE_CLASS == 64
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typedef Elf64_Xword d_tag_utype;
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#endif
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#if !defined RTLD_BOOTSTRAP && !defined STATIC_PIE_BOOTSTRAP
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if (dyn == NULL)
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return;
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#endif
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info = l->l_info;
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while (dyn->d_tag != DT_NULL)
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{
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if ((d_tag_utype) dyn->d_tag < DT_NUM)
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info[dyn->d_tag] = dyn;
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else if (dyn->d_tag >= DT_LOPROC &&
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dyn->d_tag < DT_LOPROC + DT_THISPROCNUM)
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{
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/* This does not violate the array bounds of l->l_info, but
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gcc 4.6 on sparc somehow does not see this. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (4.6,
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"-Warray-bounds");
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info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
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DIAG_POP_NEEDS_COMMENT;
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}
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else if ((d_tag_utype) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)
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info[VERSYMIDX (dyn->d_tag)] = dyn;
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else if ((d_tag_utype) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)
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info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM] = dyn;
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else if ((d_tag_utype) DT_VALTAGIDX (dyn->d_tag) < DT_VALNUM)
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info[DT_VALTAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM + DT_EXTRANUM] = dyn;
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else if ((d_tag_utype) DT_ADDRTAGIDX (dyn->d_tag) < DT_ADDRNUM)
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info[DT_ADDRTAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM] = dyn;
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++dyn;
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}
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#define DL_RO_DYN_TEMP_CNT 8
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#ifndef DL_RO_DYN_SECTION
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/* Don't adjust .dynamic unnecessarily. */
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if (l->l_addr != 0)
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{
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ElfW(Addr) l_addr = l->l_addr;
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int cnt = 0;
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# define ADJUST_DYN_INFO(tag) \
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do \
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if (info[tag] != NULL) \
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{ \
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if (temp) \
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{ \
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temp[cnt].d_tag = info[tag]->d_tag; \
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temp[cnt].d_un.d_ptr = info[tag]->d_un.d_ptr + l_addr; \
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info[tag] = temp + cnt++; \
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} \
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else \
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info[tag]->d_un.d_ptr += l_addr; \
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} \
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while (0)
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ADJUST_DYN_INFO (DT_HASH);
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ADJUST_DYN_INFO (DT_PLTGOT);
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ADJUST_DYN_INFO (DT_STRTAB);
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ADJUST_DYN_INFO (DT_SYMTAB);
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# if ! ELF_MACHINE_NO_RELA
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ADJUST_DYN_INFO (DT_RELA);
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# endif
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# if ! ELF_MACHINE_NO_REL
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ADJUST_DYN_INFO (DT_REL);
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# endif
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ADJUST_DYN_INFO (DT_JMPREL);
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ADJUST_DYN_INFO (VERSYMIDX (DT_VERSYM));
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ADJUST_DYN_INFO (DT_ADDRTAGIDX (DT_GNU_HASH) + DT_NUM + DT_THISPROCNUM
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+ DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM);
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# undef ADJUST_DYN_INFO
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assert (cnt <= DL_RO_DYN_TEMP_CNT);
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}
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#endif
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if (info[DT_PLTREL] != NULL)
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{
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#if ELF_MACHINE_NO_RELA
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assert (info[DT_PLTREL]->d_un.d_val == DT_REL);
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#elif ELF_MACHINE_NO_REL
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assert (info[DT_PLTREL]->d_un.d_val == DT_RELA);
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#else
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assert (info[DT_PLTREL]->d_un.d_val == DT_REL
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|| info[DT_PLTREL]->d_un.d_val == DT_RELA);
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#endif
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}
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#if ! ELF_MACHINE_NO_RELA
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if (info[DT_RELA] != NULL)
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assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela)));
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# endif
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# if ! ELF_MACHINE_NO_REL
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if (info[DT_REL] != NULL)
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assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel)));
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#endif
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#ifdef RTLD_BOOTSTRAP
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/* Only the bind now flags are allowed. */
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assert (info[VERSYMIDX (DT_FLAGS_1)] == NULL
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|| (info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val & ~DF_1_NOW) == 0);
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/* Flags must not be set for ld.so. */
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assert (info[DT_FLAGS] == NULL
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|| (info[DT_FLAGS]->d_un.d_val & ~DF_BIND_NOW) == 0);
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#endif
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#if defined RTLD_BOOTSTRAP || defined STATIC_PIE_BOOTSTRAP
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assert (info[DT_RUNPATH] == NULL);
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assert (info[DT_RPATH] == NULL);
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#else
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if (info[DT_FLAGS] != NULL)
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{
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/* Flags are used. Translate to the old form where available.
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Since these l_info entries are only tested for NULL pointers it
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is ok if they point to the DT_FLAGS entry. */
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l->l_flags = info[DT_FLAGS]->d_un.d_val;
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if (l->l_flags & DF_SYMBOLIC)
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info[DT_SYMBOLIC] = info[DT_FLAGS];
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if (l->l_flags & DF_TEXTREL)
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info[DT_TEXTREL] = info[DT_FLAGS];
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if (l->l_flags & DF_BIND_NOW)
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info[DT_BIND_NOW] = info[DT_FLAGS];
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}
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if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
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{
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l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
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/* Only DT_1_SUPPORTED_MASK bits are supported, and we would like
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to assert this, but we can't. Users have been setting
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unsupported DF_1_* flags for a long time and glibc has ignored
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them. Therefore to avoid breaking existing applications the
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best we can do is add a warning during debugging with the
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intent of notifying the user of the problem. */
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if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)
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&& l->l_flags_1 & ~DT_1_SUPPORTED_MASK)
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_dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x in DT_FLAGS_1.\n",
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l->l_flags_1 & ~DT_1_SUPPORTED_MASK);
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if (l->l_flags_1 & DF_1_NOW)
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info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];
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}
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if (info[DT_RUNPATH] != NULL)
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/* If both RUNPATH and RPATH are given, the latter is ignored. */
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info[DT_RPATH] = NULL;
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#endif
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}
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