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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.
	* 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 1996-06-02 21:35:43 +00:00
parent 9004bc202e
commit 6c03c2cf27
11 changed files with 50 additions and 25 deletions
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14
ChangeLog
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@ -1,5 +1,19 @@
Sun Jun 2 14:56:49 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* 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.
* login/pututline_r.c: Fix typo in sizeof for DATA_TMP alloca.
* sysdeps/generic/gnu/types.h (__clock_t): New type.

14
elf/dl-lookup.c
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@ -1,5 +1,5 @@
/* Look up a symbol in the loaded objects.
Copyright (C) 1995 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 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
@ -22,16 +22,15 @@ Cambridge, MA 02139, USA. */
#include <link.h>
#include <assert.h>
/* Search loaded objects' symbol tables for a definition of
the symbol UNDEF_NAME. If NOSELF is nonzero, then *REF
cannot satisfy the reference itself; some different binding
must be found. */
/* Search loaded objects' symbol tables for a definition of the symbol
UNDEF_NAME. If NOPLT is nonzero, then a PLT entry cannot satisfy the
reference; some different binding must be found. */
Elf32_Addr
_dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
struct link_map *symbol_scope,
const char *reference_name,
int noself)
int noplt)
{
unsigned long int hash = elf_hash (undef_name);
struct link_map *map;
@ -60,8 +59,7 @@ _dl_lookup_symbol (const char *undef_name, const Elf32_Sym **ref,
const Elf32_Sym *sym = &symtab[symidx];
if (sym->st_value == 0 || /* No value. */
sym->st_shndx == SHN_UNDEF || /* PLT entry. */
(noself && sym == *ref)) /* The reference can't define it. */
(noplt && sym->st_shndx == SHN_UNDEF)) /* Unwanted PLT entry. */
continue;
switch (ELF32_ST_TYPE (sym->st_info))

4
elf/dl-reloc.c
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@ -60,10 +60,10 @@ _dl_relocate_object (struct link_map *l, int lazy)
= ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
Elf32_Addr resolve (const Elf32_Sym **ref, Elf32_Addr r_offset)
Elf32_Addr resolve (const Elf32_Sym **ref, int noplt)
{
return _dl_lookup_symbol (strtab + (*ref)->st_name, ref, scope,
l->l_name, (*ref)->st_value == r_offset);
l->l_name, noplt);
}
real_next = l->l_next;

2
elf/dl-runtime.c
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@ -86,7 +86,7 @@ fixup (
definer = &symtab[ELF32_R_SYM (reloc->r_info)];
loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer,
scope, l->l_name, 0);
scope, l->l_name, 1);
/* Restore list frobnication done above for DT_SYMBOLIC. */
l->l_next = real_next;

4
elf/dlsym.c
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@ -1,5 +1,5 @@
/* dlsym -- Look up a symbol in a shared object loaded by `dlopen'.
Copyright (C) 1995 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 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
@ -33,7 +33,7 @@ dlsym (void *handle, const char *name)
int lose;
void doit (void)
{
loadbase = _dl_lookup_symbol (name, &ref, map, map->l_name, 1);
loadbase = _dl_lookup_symbol (name, &ref, map, map->l_name, 0);
}
/* Confine the symbol scope to just this map. */

5
elf/do-rel.h
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@ -38,7 +38,7 @@ static inline void
elf_dynamic_do_rel (struct link_map *map,
int reltag, int sztag,
Elf32_Addr (*resolve) (const Elf32_Sym **symbol,
Elf32_Addr r_offset),
int noplt),
int lazy)
{
const Elf32_Sym *const symtab
@ -65,7 +65,8 @@ elf_dynamic_do_rel (struct link_map *map,
else
{
if (resolve)
loadbase = (*resolve) (&definer, r->r_offset);
loadbase = (*resolve)
(&definer, elf_machine_pltrel_p (ELF32_R_TYPE (r->r_info)));
else
{
assert (definer->st_shndx != SHN_UNDEF);

7
elf/link.h
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@ -185,14 +185,13 @@ extern void _dl_setup_hash (struct link_map *map);
reference; it is replaced with the defining symbol, and the base load
address of the defining object is returned. SYMBOL_SCOPE is the head of
the chain used for searching. REFERENCE_NAME should name the object
containing the reference; it is used in error messages. If NOSELF is
nonzero, them *SYM itself cannot define the value; another binding must
be found. */
containing the reference; it is used in error messages. If NOPLT is
nonzero, then the reference must not be resolved to a PLT entry. */
extern Elf32_Addr _dl_lookup_symbol (const char *undef,
const Elf32_Sym **sym,
struct link_map *symbol_scope,
const char *reference_name,
int noself);
int noplt);
/* List of objects currently loaded. */

2
elf/rtld.c
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@ -318,7 +318,7 @@ of this helper program; chances are you did not intend to run this program.\n",
const Elf32_Sym *ref = NULL;
Elf32_Addr loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,
_dl_loaded, "argument",
1);
0);
char buf[20], *bp;
buf[sizeof buf - 1] = '\0';
bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);

4
sysdeps/i386/dl-machine.h
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@ -132,6 +132,10 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rel *reloc)
}
}
/* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */
#define elf_machine_pltrel_p(type) ((type) == R_386_JMP_SLOT)
/* The i386 never uses Elf32_Rela relocations. */
#define ELF_MACHINE_NO_RELA 1

4
sysdeps/m68k/dl-machine.h
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@ -136,6 +136,10 @@ elf_machine_lazy_rel (struct link_map *map, const Elf32_Rela *reloc)
}
}
/* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */
#define elf_machine_pltrel_p(type) ((type) == R_68K_JMP_SLOT)
/* The m68k never uses Elf32_Rel relocations. */
#define ELF_MACHINE_NO_REL 1

7
sysdeps/stub/dl-machine.h
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@ -1,5 +1,5 @@
/* Machine-dependent ELF dynamic relocation inline functions. Stub version.
Copyright (C) 1995 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 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
@ -89,6 +89,11 @@ elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
}
/* Nonzero iff TYPE describes relocation of a PLT entry, so
PLT entries should not be allowed to define the value. */
#define elf_machine_pltrel_p(type) ((type) == R_???_JMP_SLOT)
/* Set up the loaded object described by L so its unrelocated PLT
entries will jump to the on-demand fixup code in dl-runtime.c. */