Thu Jun 16 14:25:22 1994 Eric Youngdale (ericy@cais.cais.com)
* i386linux.c: Many new functions and definitions for linker support for Linux shared libraries. * bfd-in.h (bfd_linux_size_dynamic_sections): Declare. * bfd-in2.h: Rebuild.
This commit is contained in:
Ian Lance Taylor
parent
7b0243215c
commit
04003b573d
3 changed files with 638 additions and 0 deletions
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@ -1,3 +1,15 @@
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Thu Jun 16 14:25:22 1994 Eric Youngdale (ericy@cais.cais.com)
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* i386linux.c: Many new functions and definitions for linker
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support for Linux shared libraries.
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* bfd-in.h (bfd_linux_size_dynamic_sections): Declare.
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* bfd-in2.h: Rebuild.
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Thu Jun 16 14:23:46 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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* aoutx.h (NAME(aout,some_aout_object_p)): Accept BMAGIC objects
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and treat them as OMAGIC.
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Wed Jun 15 18:02:21 1994 Ken Raeburn (raeburn@cujo.cygnus.com)
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Enable sparc v9 support for release. Note that this is still a
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@ -545,6 +545,11 @@ extern boolean bfd_sunos_size_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *, struct sec **, struct sec **,
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struct sec **));
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/* Linux shared library support routines for the linker. */
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extern boolean bfd_linux_size_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *));
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/* And more from the source. */
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void
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bfd_init PARAMS ((void));
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621
bfd/i386linux.c
621
bfd/i386linux.c
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@ -75,5 +75,626 @@ i386linux_write_object_contents (abfd)
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}
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#define MY_write_object_contents i386linux_write_object_contents
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/* Code to link against Linux a.out shared libraries. */
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/* See if a symbol name is a reference to the global offset table. */
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#ifndef GOT_REF_PREFIX
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#define GOT_REF_PREFIX "__GOT_"
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#endif
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#define IS_GOT_SYM(name) \
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(strncmp (name, GOT_REF_PREFIX, sizeof GOT_REF_PREFIX - 1) == 0)
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/* See if a symbol name is a reference to the procedure linkage table. */
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#ifndef PLT_REF_PREFIX
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#define PLT_REF_PREFIX "__PLT_"
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#endif
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#define IS_PLT_SYM(name) \
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(strncmp (name, PLT_REF_PREFIX, sizeof PLT_REF_PREFIX - 1) == 0)
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/* This special symbol is a set vector that contains a list of
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pointers to fixup tables. It will be present in any dynamicly
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linked file. The linker generated fixup table should also be added
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to the list, and it should always appear in the second slot (the
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first one is a dummy with a magic number that is defined in
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crt0.o). */
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#ifndef SHARABLE_CONFLICTS
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#define SHARABLE_CONFLICTS "__SHARABLE_CONFLICTS__"
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#endif
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/* We keep a list of fixups. The terminology is a bit strange, but
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each fixup contains two 32 bit numbers. A regular fixup contains
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an address and a pointer, and at runtime we should store the
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address at the location pointed to by the pointer. A builtin fixup
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contains two pointers, and we should read the address using one
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pointer and store it at the location pointed to by the other
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pointer. Builtin fixups come into play when we have duplicate
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__GOT__ symbols for the same variable. The builtin fixup will copy
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the GOT pointer from one over into the other. */
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struct fixup
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{
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struct fixup *next;
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struct linux_link_hash_entry *h;
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bfd_vma value;
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/* Nonzero if this is a jump instruction that needs to be fixed,
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zero if this is just a pointer */
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char jump;
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char builtin;
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};
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/* We don't need a special hash table entry structure, but we do need
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to keep some information between linker passes, so we use a special
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hash table. */
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struct linux_link_hash_entry
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{
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struct aout_link_hash_entry root;
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};
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struct linux_link_hash_table
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{
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struct aout_link_hash_table root;
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/* First dynamic object found in link. */
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bfd *dynobj;
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/* Number of fixups. */
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size_t fixup_count;
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/* Number of builtin fixups. */
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size_t local_builtins;
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/* List of fixups. */
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struct fixup *fixup_list;
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};
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static struct bfd_hash_entry *linux_link_hash_newfunc
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PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
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static struct bfd_link_hash_table *linux_link_hash_table_create
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PARAMS ((bfd *));
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static struct fixup *new_fixup
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PARAMS ((struct bfd_link_info *, struct linux_link_hash_entry *,
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bfd_vma, int));
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static boolean linux_link_create_dynamic_sections
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PARAMS ((bfd *, struct bfd_link_info *));
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static boolean linux_add_one_symbol
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PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword, asection *,
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bfd_vma, const char *, boolean, boolean,
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struct bfd_link_hash_entry **));
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static boolean linux_tally_symbols
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PARAMS ((struct linux_link_hash_entry *, PTR));
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static boolean linux_finish_dynamic_link
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PARAMS ((bfd *, struct bfd_link_info *));
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/* Routine to create an entry in an Linux link hash table. */
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static struct bfd_hash_entry *
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linux_link_hash_newfunc (entry, table, string)
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struct bfd_hash_entry *entry;
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struct bfd_hash_table *table;
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const char *string;
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{
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struct linux_link_hash_entry *ret = (struct linux_link_hash_entry *) entry;
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/* Allocate the structure if it has not already been allocated by a
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subclass. */
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if (ret == (struct linux_link_hash_entry *) NULL)
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ret = ((struct linux_link_hash_entry *)
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bfd_hash_allocate (table, sizeof (struct linux_link_hash_entry)));
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if (ret == NULL)
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return (struct bfd_hash_entry *) ret;
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/* Call the allocation method of the superclass. */
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ret = ((struct linux_link_hash_entry *)
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NAME(aout,link_hash_newfunc) ((struct bfd_hash_entry *) ret,
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table, string));
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if (ret != NULL)
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{
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/* Set local fields; there aren't any. */
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}
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return (struct bfd_hash_entry *) ret;
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}
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/* Create a Linux link hash table. */
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static struct bfd_link_hash_table *
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linux_link_hash_table_create (abfd)
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bfd *abfd;
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{
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struct linux_link_hash_table *ret;
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ret = ((struct linux_link_hash_table *)
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malloc (sizeof (struct linux_link_hash_table)));
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if (ret == (struct linux_link_hash_table *) NULL)
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{
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bfd_set_error (bfd_error_no_memory);
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return (struct bfd_link_hash_table *) NULL;
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}
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if (! NAME(aout,link_hash_table_init) (&ret->root, abfd,
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linux_link_hash_newfunc))
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{
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free (ret);
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return (struct bfd_link_hash_table *) NULL;
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}
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ret->dynobj = NULL;
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ret->fixup_count = 0;
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ret->local_builtins = 0;
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ret->fixup_list = NULL;
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return &ret->root.root;
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}
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/* Look up an entry in a Linux link hash table. */
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#define linux_link_hash_lookup(table, string, create, copy, follow) \
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((struct linux_link_hash_entry *) \
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aout_link_hash_lookup (&(table)->root, (string), (create), (copy),\
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(follow)))
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/* Traverse a Linux link hash table. */
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#define linux_link_hash_traverse(table, func, info) \
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(aout_link_hash_traverse \
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(&(table)->root, \
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(boolean (*) PARAMS ((struct aout_link_hash_entry *, PTR))) (func), \
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(info)))
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/* Get the Linux link hash table from the info structure. This is
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just a cast. */
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#define linux_hash_table(p) ((struct linux_link_hash_table *) ((p)->hash))
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/* Store the information for a new fixup. */
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static struct fixup *
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new_fixup (info, h, value, builtin)
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struct bfd_link_info *info;
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struct linux_link_hash_entry *h;
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bfd_vma value;
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int builtin;
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{
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struct fixup *f;
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f = (struct fixup *) bfd_hash_allocate (&info->hash->table,
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sizeof (struct fixup));
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if (f == NULL)
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return f;
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f->next = linux_hash_table (info)->fixup_list;
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linux_hash_table (info)->fixup_list = f;
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f->h = h;
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f->value = value;
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f->builtin = builtin;
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f->jump = 0;
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++linux_hash_table (info)->fixup_count;
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return f;
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}
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/* We come here once we realize that we are going to link to a shared
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library. We need to create a special section that contains the
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fixup table, and we ultimately need to add a pointer to this into
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the set vector for SHARABLE_CONFLICTS. At this point we do not
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know the size of the section, but that's OK - we just need to
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create it for now. */
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static boolean
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linux_link_create_dynamic_sections (abfd, info)
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bfd *abfd;
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struct bfd_link_info *info;
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{
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flagword flags;
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register asection *s;
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/* Note that we set the SEC_IN_MEMORY flag. */
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flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
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/* We choose to use the name ".dynamic" for the fixup table. Why
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not? */
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s = bfd_make_section (abfd, ".dynamic");
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if (s == NULL
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|| ! bfd_set_section_flags (abfd, s, flags)
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|| ! bfd_set_section_alignment (abfd, s, 2))
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return false;
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s->_raw_size = 0;
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s->contents = 0;
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return true;
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}
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/* Function to add a single symbol to the linker hash table. This is
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a wrapper around _bfd_generic_link_add_one_symbol which handles the
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tweaking needed for dynamic linking support. */
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static boolean
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linux_add_one_symbol (info, abfd, name, flags, section, value, string,
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copy, collect, hashp)
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struct bfd_link_info *info;
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bfd *abfd;
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const char *name;
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flagword flags;
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asection *section;
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bfd_vma value;
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const char *string;
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boolean copy;
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boolean collect;
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struct bfd_link_hash_entry **hashp;
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{
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struct linux_link_hash_entry *h;
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boolean insert;
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/* Look up and see if we already have this symbol in the hash table.
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If we do, and the defining entry is from a shared library, we
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need to create the dynamic sections.
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FIXME: What if abfd->xvec != info->hash->creator? We may want to
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be able to link Linux a.out and ELF objects together, but serious
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confusion is possible. */
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insert = false;
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if (! info->relocateable
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&& linux_hash_table (info)->dynobj == NULL
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&& strcmp (name, SHARABLE_CONFLICTS) == 0)
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{
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if (! linux_link_create_dynamic_sections (abfd, info))
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return false;
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linux_hash_table (info)->dynobj = abfd;
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insert = true;
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}
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if (section == &bfd_abs_section
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&& (IS_GOT_SYM (name) || IS_PLT_SYM (name)))
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{
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h = linux_link_hash_lookup (linux_hash_table (info), name, false,
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false, false);
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if (h != NULL
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&& h->root.root.type == bfd_link_hash_defined)
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{
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if (new_fixup (info, h, value, ! IS_PLT_SYM(name)) == NULL)
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return false;
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return true;
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}
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if (hashp != NULL)
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*hashp = (struct bfd_link_hash_entry *) h;
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}
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/* Do the usual procedure for adding a symbol. */
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if (! _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section,
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value, string, copy, collect,
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hashp))
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return false;
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/* Insert a pointer to our table in the set vector. The dynamic
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linker requires this information */
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if (insert)
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{
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asection *s;
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/* Here we do our special thing to add the pointer to the
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dynamic section in the SHARABLE_CONFLICTS set vector. */
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s = bfd_get_section_by_name (linux_hash_table (info)->dynobj,
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".dynamic");
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BFD_ASSERT (s != NULL);
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if (! (_bfd_generic_link_add_one_symbol
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(info, linux_hash_table (info)->dynobj, SHARABLE_CONFLICTS,
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BSF_GLOBAL | BSF_CONSTRUCTOR, s, 0, NULL, false, false, NULL)))
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return false;
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}
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return true;
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}
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/* We will crawl the hash table and come here for every global symbol.
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We will examine each entry and see if there are indications that we
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need to add a fixup. There are two possible cases - one is where
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you have duplicate definitions of PLT or GOT symbols - these will
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have already been caught and added as "builtin" fixups. If we find
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that the corresponding non PLT/GOT symbol is also present, we
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convert it to a regular fixup instead.
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This function is called via linux_link_hash_traverse. */
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static boolean
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linux_tally_symbols (h, data)
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struct linux_link_hash_entry *h;
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PTR data;
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{
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struct bfd_link_info *info = (struct bfd_link_info *) data;
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struct fixup *f, *f1;
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int is_plt;
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struct linux_link_hash_entry *h1, *h2;
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/* If this symbol is not a PLT/GOT, we do not even need to look at it */
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is_plt = IS_PLT_SYM (h->root.root.root.string);
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if (is_plt || IS_GOT_SYM (h->root.root.root.string))
|
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{
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/* Look up this symbol twice. Once just as a regular lookup,
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and then again following all of the indirect links until we
|
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reach a real symbol. */
|
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h1 = linux_link_hash_lookup (linux_hash_table (info),
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(h->root.root.root.string
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+ sizeof PLT_REF_PREFIX - 1),
|
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false, false, true);
|
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/* h2 does not follow indirect symbols. */
|
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h2 = linux_link_hash_lookup (linux_hash_table (info),
|
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(h->root.root.root.string
|
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+ sizeof PLT_REF_PREFIX - 1),
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false, false, false);
|
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|
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/* The real symbol must exist but if it is also an ABS symbol,
|
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there is no need to have a fixup. This is because they both
|
||||
came from the same library. If on the other hand, we had to
|
||||
use an indirect symbol to get to the real symbol, we add the
|
||||
fixup anyway, since there are cases where these symbols come
|
||||
from different shared libraries */
|
||||
if (h1 != NULL
|
||||
&& ((h1->root.root.type == bfd_link_hash_defined
|
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&& h1->root.root.u.def.section != &bfd_abs_section)
|
||||
|| h2->root.root.type == bfd_link_hash_indirect))
|
||||
{
|
||||
f = new_fixup (info, h1, h->root.root.u.def.value, 0);
|
||||
if (f == NULL)
|
||||
{
|
||||
/* FIXME: No way to return error. */
|
||||
abort ();
|
||||
}
|
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f->jump = is_plt;
|
||||
|
||||
/* See if there is a "builtin" fixup already present
|
||||
involving this symbol. If so, convert it to a regular
|
||||
fixup. In the end, this relaxes some of the requirements
|
||||
about the order of performing fixups. */
|
||||
for (f1 = linux_hash_table (info)->fixup_list;
|
||||
f1 != NULL;
|
||||
f1 = f1->next)
|
||||
{
|
||||
if (f1 == f)
|
||||
continue;
|
||||
if (f1->h != h)
|
||||
continue;
|
||||
f1->h = h1;
|
||||
f1->jump = is_plt;
|
||||
f1->builtin = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Quick and dirty way of stripping these symbols from the
|
||||
symtab. */
|
||||
h->root.written = true;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/* This is called to set the size of the .dynamic section is. It is
|
||||
called by the Linux linker emulation before_allocation routine. We
|
||||
have finished reading all of the input files, and now we just scan
|
||||
the hash tables to find out how many additional fixups are
|
||||
required. */
|
||||
|
||||
boolean
|
||||
bfd_linux_size_dynamic_sections (output_bfd, info)
|
||||
bfd *output_bfd;
|
||||
struct bfd_link_info *info;
|
||||
{
|
||||
struct fixup *f;
|
||||
asection *s;
|
||||
|
||||
/* First find the fixups... */
|
||||
linux_link_hash_traverse (linux_hash_table (info),
|
||||
linux_tally_symbols,
|
||||
(PTR) info);
|
||||
|
||||
/* If there are builtin fixups, leave room for a marker. This is
|
||||
used by the dynamic linker so that it knows that all that follow
|
||||
are builtin fixups instead of regular fixups. */
|
||||
for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
|
||||
{
|
||||
if (f->builtin)
|
||||
{
|
||||
++linux_hash_table (info)->fixup_count;
|
||||
++linux_hash_table (info)->local_builtins;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (linux_hash_table (info)->dynobj == NULL)
|
||||
{
|
||||
if (linux_hash_table (info)->fixup_count > 0)
|
||||
abort ();
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Allocate memory for our fixup table. We will fill it in later. */
|
||||
s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, ".dynamic");
|
||||
if (s != NULL)
|
||||
{
|
||||
s->_raw_size = 8 + linux_hash_table (info)->fixup_count * 8;
|
||||
s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
|
||||
if (s->contents == NULL)
|
||||
{
|
||||
bfd_set_error (bfd_error_no_memory);
|
||||
return false;
|
||||
}
|
||||
memset (s->contents, 0, s->_raw_size);
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/* We come here once we are ready to actually write the fixup table to
|
||||
the output file. Scan the fixup tables and so forth and generate
|
||||
the stuff we need. */
|
||||
|
||||
static boolean
|
||||
linux_finish_dynamic_link (output_bfd, info)
|
||||
bfd *output_bfd;
|
||||
struct bfd_link_info *info;
|
||||
{
|
||||
asection *s, *os, *is;
|
||||
bfd_byte *fixup_table;
|
||||
struct linux_link_hash_entry *h;
|
||||
struct fixup *f;
|
||||
unsigned int new_addr;
|
||||
int section_offset;
|
||||
int fixups_written;
|
||||
|
||||
if (linux_hash_table (info)->dynobj == NULL)
|
||||
return true;
|
||||
|
||||
s = bfd_get_section_by_name (linux_hash_table (info)->dynobj, ".dynamic");
|
||||
BFD_ASSERT (s != NULL);
|
||||
os = s->output_section;
|
||||
fixups_written = 0;
|
||||
|
||||
#ifdef LINUX_LINK_DEBUG
|
||||
printf ("Fixup table file offset: %x VMA: %x\n",
|
||||
os->filepos + s->output_offset,
|
||||
os->vma + s->output_offset);
|
||||
#endif
|
||||
|
||||
fixup_table = s->contents;
|
||||
bfd_put_32 (output_bfd, linux_hash_table (info)->fixup_count, fixup_table);
|
||||
fixup_table += 4;
|
||||
|
||||
/* Fill in fixup table. */
|
||||
for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
|
||||
{
|
||||
if (f->builtin)
|
||||
continue;
|
||||
|
||||
if (f->h->root.root.type != bfd_link_hash_defined)
|
||||
{
|
||||
/* FIXME! */
|
||||
fprintf (stderr,
|
||||
"Symbol %s not defined for fixups\n",
|
||||
f->h->root.root.root.string);
|
||||
continue;
|
||||
}
|
||||
|
||||
is = f->h->root.root.u.def.section;
|
||||
section_offset = is->output_section->vma + is->output_offset;
|
||||
new_addr = f->h->root.root.u.def.value + section_offset;
|
||||
|
||||
#ifdef LINUX_LINK_DEBUG
|
||||
printf ("Fixup(%d) %s: %x %x\n",f->jump, f->h->root.root.string,
|
||||
new_addr, f->value);
|
||||
#endif
|
||||
|
||||
if (f->jump)
|
||||
{
|
||||
/* Relative address */
|
||||
new_addr = new_addr - (f->value + 5);
|
||||
bfd_put_32 (output_bfd, new_addr, fixup_table);
|
||||
fixup_table += 4;
|
||||
bfd_put_32 (output_bfd, f->value + 1, fixup_table);
|
||||
fixup_table += 4;
|
||||
}
|
||||
else
|
||||
{
|
||||
bfd_put_32 (output_bfd, new_addr, fixup_table);
|
||||
fixup_table += 4;
|
||||
bfd_put_32 (output_bfd, f->value, fixup_table);
|
||||
fixup_table += 4;
|
||||
}
|
||||
++fixups_written;
|
||||
}
|
||||
|
||||
if (linux_hash_table (info)->local_builtins != 0)
|
||||
{
|
||||
/* Special marker so we know to switch to the other type of fixup */
|
||||
bfd_put_32 (output_bfd, 0, fixup_table);
|
||||
fixup_table += 4;
|
||||
bfd_put_32 (output_bfd, 0, fixup_table);
|
||||
fixup_table += 4;
|
||||
++fixups_written;
|
||||
for (f = linux_hash_table (info)->fixup_list; f != NULL; f = f->next)
|
||||
{
|
||||
if (! f->builtin)
|
||||
continue;
|
||||
|
||||
if (f->h->root.root.type != bfd_link_hash_defined)
|
||||
{
|
||||
/* FIXME! */
|
||||
fprintf (stderr,
|
||||
"Symbol %s not defined for fixups\n",
|
||||
f->h->root.root.root.string);
|
||||
continue;
|
||||
}
|
||||
|
||||
is = f->h->root.root.u.def.section;
|
||||
section_offset = is->output_section->vma + is->output_offset;
|
||||
new_addr = f->h->root.root.u.def.value + section_offset;
|
||||
|
||||
#ifdef LINUX_LINK_DEBUG
|
||||
printf ("Fixup(B) %s: %x %x\n", f->h->root.root.string,
|
||||
new_addr, f->value);
|
||||
#endif
|
||||
|
||||
bfd_put_32 (output_bfd, new_addr, fixup_table);
|
||||
fixup_table += 4;
|
||||
bfd_put_32 (output_bfd, f->value, fixup_table);
|
||||
fixup_table += 4;
|
||||
++fixups_written;
|
||||
}
|
||||
}
|
||||
|
||||
if (linux_hash_table (info)->fixup_count != fixups_written)
|
||||
{
|
||||
/* FIXME! */
|
||||
fprintf (stderr, "Warning: fixup count mismatch\n");
|
||||
while (linux_hash_table (info)->fixup_count > fixups_written)
|
||||
{
|
||||
bfd_put_32 (output_bfd, 0, fixup_table);
|
||||
fixup_table += 4;
|
||||
bfd_put_32 (output_bfd, 0, fixup_table);
|
||||
fixup_table += 4;
|
||||
++fixups_written;
|
||||
}
|
||||
}
|
||||
|
||||
h = linux_link_hash_lookup (linux_hash_table (info),
|
||||
"__BUILTIN_FIXUPS__",
|
||||
false, false, false);
|
||||
|
||||
if (h != NULL && h->root.root.type == bfd_link_hash_defined)
|
||||
{
|
||||
is = h->root.root.u.def.section;
|
||||
section_offset = is->output_section->vma + is->output_offset;
|
||||
new_addr = h->root.root.u.def.value + section_offset;
|
||||
|
||||
#ifdef LINUX_LINK_DEBUG
|
||||
printf ("Builtin fixup table at %x\n", new_addr);
|
||||
#endif
|
||||
|
||||
bfd_put_32 (output_bfd, new_addr, fixup_table);
|
||||
}
|
||||
else
|
||||
bfd_put_32 (output_bfd, 0, fixup_table);
|
||||
|
||||
if (bfd_seek (output_bfd, os->filepos + s->output_offset, SEEK_SET) != 0)
|
||||
return false;
|
||||
|
||||
if (bfd_write ((PTR) s->contents, 1, s->_raw_size, output_bfd)
|
||||
!= s->_raw_size)
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
#define MY_bfd_link_hash_table_create linux_link_hash_table_create
|
||||
#define MY_add_one_symbol linux_add_one_symbol
|
||||
#define MY_finish_dynamic_link linux_finish_dynamic_link
|
||||
|
||||
#include "aout-target.h"
|
||||
|
|
|
|||
Loading…
Reference in a new issue