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* elf/dl-lookup.c (_dl_lookup_symbol): Arg NOSELF renamed to NOPLT.
Reject SHN_UNDEF defns iff NOPLT is nonzero. * elf/link.h (_dl_lookup_symbol): Update prototype and comment. * elf/dl-runtime.c (fixup): Pass 1 to _dl_lookup_symbol for NOPLT. * elf/dlsym.c (dlsym): Pass 0. * elf/rtld.c (dl_main): Likewise. * elf/dl-reloc.c (_dl_relocate_object: resolve): Second arg R_OFFSET replaced with NOPLT flag. Pass it through to _dl_lookup_symbol. * elf/do-rel.h (elf_dynamic_do_rel): Update prototype of RESOLVE arg. Pass `elf_machine_pltrel_p (R->r_type)' result as NOPLT flag value. * sysdeps/i386/dl-machine.h (elf_machine_pltrel_p): New macro. * sysdeps/m68k/dl-machine.h (elf_machine_pltrel_p): Likewise. * sysdeps/stub/dl-machine.h (elf_machine_pltrel_p): Likewise.
This commit is contained in:
Roland McGrath
parent
9004bc202e
commit
6c03c2cf27
14
ChangeLog
14
ChangeLog
@ -1,5 +1,19 @@
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Sun Jun 2 14:56:49 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
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* elf/dl-lookup.c (_dl_lookup_symbol): Arg NOSELF renamed to NOPLT.
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Reject SHN_UNDEF defns iff NOPLT is nonzero.
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* elf/link.h (_dl_lookup_symbol): Update prototype and comment.
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* elf/dl-runtime.c (fixup): Pass 1 to _dl_lookup_symbol for NOPLT.
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* elf/dlsym.c (dlsym): Pass 0.
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* elf/rtld.c (dl_main): Likewise.
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* elf/dl-reloc.c (_dl_relocate_object: resolve): Second arg R_OFFSET
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replaced with NOPLT flag. Pass it through to _dl_lookup_symbol.
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* elf/do-rel.h (elf_dynamic_do_rel): Update prototype of RESOLVE arg.
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Pass `elf_machine_pltrel_p (R->r_type)' result as NOPLT flag value.
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* sysdeps/i386/dl-machine.h (elf_machine_pltrel_p): New macro.
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* sysdeps/m68k/dl-machine.h (elf_machine_pltrel_p): Likewise.
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* sysdeps/stub/dl-machine.h (elf_machine_pltrel_p): Likewise.
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* login/pututline_r.c: Fix typo in sizeof for DATA_TMP alloca.
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* sysdeps/generic/gnu/types.h (__clock_t): New type.
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@ -1,5 +1,5 @@
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/* Look up a symbol in the loaded objects.
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Copyright (C) 1995 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996 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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@ -22,16 +22,15 @@ Cambridge, MA 02139, USA. */
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#include <link.h>
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#include <assert.h>
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/* Search loaded objects' symbol tables for a definition of
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the symbol UNDEF_NAME. If NOSELF is nonzero, then *REF
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cannot satisfy the reference itself; some different binding
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must be found. */
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/* Search loaded objects' symbol tables for a definition of the symbol
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UNDEF_NAME. If NOPLT is nonzero, then a PLT entry cannot satisfy the
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reference; some different binding must be found. */
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Elf32_Addr
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_dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
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struct link_map *symbol_scope,
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const char *reference_name,
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int noself)
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int noplt)
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{
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unsigned long int hash = elf_hash (undef_name);
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struct link_map *map;
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@ -60,8 +59,7 @@ _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
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const Elf32_Sym *sym = &symtab[symidx];
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if (sym->st_value == 0 || /* No value. */
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sym->st_shndx == SHN_UNDEF || /* PLT entry. */
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(noself && sym == *ref)) /* The reference can't define it. */
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(noplt && sym->st_shndx == SHN_UNDEF)) /* Unwanted PLT entry. */
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continue;
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switch (ELF32_ST_TYPE (sym->st_info))
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@ -60,10 +60,10 @@ _dl_relocate_object (struct link_map *l, int lazy)
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= ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
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Elf32_Addr resolve (const Elf32_Sym **ref, Elf32_Addr r_offset)
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Elf32_Addr resolve (const Elf32_Sym **ref, int noplt)
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{
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return _dl_lookup_symbol (strtab + (*ref)->st_name, ref, scope,
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l->l_name, (*ref)->st_value == r_offset);
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l->l_name, noplt);
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}
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real_next = l->l_next;
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@ -86,7 +86,7 @@ fixup (
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definer = &symtab[ELF32_R_SYM (reloc->r_info)];
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loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,
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scope, l->l_name, 0);
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scope, l->l_name, 1);
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/* Restore list frobnication done above for DT_SYMBOLIC. */
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l->l_next = real_next;
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@ -1,5 +1,5 @@
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/* dlsym -- Look up a symbol in a shared object loaded by `dlopen'.
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Copyright (C) 1995 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996 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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@ -33,7 +33,7 @@ dlsym (void *handle, const char *name)
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int lose;
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void doit (void)
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{
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loadbase = _dl_lookup_symbol (name, &ref, map, map->l_name, 1);
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loadbase = _dl_lookup_symbol (name, &ref, map, map->l_name, 0);
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}
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/* Confine the symbol scope to just this map. */
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11
elf/do-rel.h
11
elf/do-rel.h
@ -21,9 +21,9 @@ Cambridge, MA 02139, USA. */
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`elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */
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#ifdef DO_RELA
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#define elf_dynamic_do_rel elf_dynamic_do_rela
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#define Elf32_Rel Elf32_Rela
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#define elf_machine_rel elf_machine_rela
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#define elf_dynamic_do_rel elf_dynamic_do_rela
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#define Elf32_Rel Elf32_Rela
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#define elf_machine_rel elf_machine_rela
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#endif
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@ -38,7 +38,7 @@ static inline void
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elf_dynamic_do_rel (struct link_map *map,
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int reltag, int sztag,
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Elf32_Addr (*resolve) (const Elf32_Sym **symbol,
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Elf32_Addr r_offset),
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int noplt),
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int lazy)
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{
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const Elf32_Sym *const symtab
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@ -65,7 +65,8 @@ elf_dynamic_do_rel (struct link_map *map,
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else
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{
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if (resolve)
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loadbase = (*resolve) (&definer, r->r_offset);
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loadbase = (*resolve)
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(&definer, elf_machine_pltrel_p (ELF32_R_TYPE (r->r_info)));
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else
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{
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assert (definer->st_shndx != SHN_UNDEF);
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@ -185,14 +185,13 @@ extern void _dl_setup_hash (struct link_map *map);
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reference; it is replaced with the defining symbol, and the base load
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address of the defining object is returned. SYMBOL_SCOPE is the head of
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the chain used for searching. REFERENCE_NAME should name the object
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containing the reference; it is used in error messages. If NOSELF is
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nonzero, them *SYM itself cannot define the value; another binding must
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be found. */
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containing the reference; it is used in error messages. If NOPLT is
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nonzero, then the reference must not be resolved to a PLT entry. */
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extern Elf32_Addr _dl_lookup_symbol (const char *undef,
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const Elf32_Sym **sym,
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struct link_map *symbol_scope,
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const char *reference_name,
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int noself);
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int noplt);
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/* List of objects currently loaded. */
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@ -318,7 +318,7 @@ of this helper program; chances are you did not intend to run this program.\n",
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const Elf32_Sym *ref = NULL;
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Elf32_Addr loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,
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_dl_loaded, "argument",
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1);
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0);
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char buf[20], *bp;
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buf[sizeof buf - 1] = '\0';
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bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);
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@ -132,6 +132,10 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rel *reloc)
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}
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}
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/* Nonzero iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value. */
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#define elf_machine_pltrel_p(type) ((type) == R_386_JMP_SLOT)
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/* The i386 never uses Elf32_Rela relocations. */
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#define ELF_MACHINE_NO_RELA 1
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@ -136,6 +136,10 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
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}
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}
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/* Nonzero iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value. */
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#define elf_machine_pltrel_p(type) ((type) == R_68K_JMP_SLOT)
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/* The m68k never uses Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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@ -1,5 +1,5 @@
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/* Machine-dependent ELF dynamic relocation inline functions. Stub version.
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Copyright (C) 1995 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996 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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@ -81,7 +81,7 @@ elf_machine_rel (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
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static inline void
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elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
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const Elf32_Rela *reloc,
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const Elf32_Rela *reloc,
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Elf32_Addr sym_loadaddr, const Elf32_Sym *sym)
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{
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_dl_signal_error (0, "Elf32_Rela relocation requested -- unused on "
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@ -89,6 +89,11 @@ elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
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}
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/* Nonzero iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value. */
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#define elf_machine_pltrel_p(type) ((type) == R_???_JMP_SLOT)
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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