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authorMaciej W. Rozycki <macro@imgtec.com>2017-02-02 22:05:46 +0000
committerMaciej W. Rozycki <macro@imgtec.com>2017-02-02 22:38:23 +0000
commite17b0c351f0b22fb42edf34e5a6e486d72e9ee05 (patch)
treec2529cdc261f4d726942acaf85b86e049cd35646 /bfd
parent55f8b9d243dbd879ffa585f7e0c7d8b6b819302d (diff)
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MIPS/BFD: Respect the ELF gABI dynamic symbol table sort requirement
Ensure all local symbols precede external symbols in the dynamic symbol table. No local symbols are expected to make it to the dynamic symbol table except for section symbols already taken care of, so this is really a safeguard only against a potential BFD bug otherwise not so harmful, which may become a grave one due to a symbol table sorting requirement violation (see PR ld/20828 for an example). This means however that no test suite coverage is possible for this change as code introduced here is not normally expected to trigger. Logically split then the part of the dynamic symbol table which is not global offset table mapped, into a local area at the beginning and an external area following. By the time `mips_elf_sort_hash_table' is called we have the number of local dynamic symbol table entries (section and non-section) already counted in `local_dynsymcount', so use it to offset the external area from the beginning. bfd/ * elfxx-mips.c (mips_elf_hash_sort_data): Add `max_local_dynindx'. (mips_elf_sort_hash_table): Handle it. (mips_elf_sort_hash_table_f) <GGA_NONE>: For forced local symbols bump up `max_local_dynindx' rather than `max_non_got_dynindx'.
Diffstat (limited to 'bfd')
-rw-r--r--bfd/ChangeLog9
-rw-r--r--bfd/elfxx-mips.c16
2 files changed, 22 insertions, 3 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index c351eb1..bbd1200 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,14 @@
2017-02-02 Maciej W. Rozycki <macro@imgtec.com>
+ * elfxx-mips.c (mips_elf_hash_sort_data): Add
+ `max_local_dynindx'.
+ (mips_elf_sort_hash_table): Handle it.
+ (mips_elf_sort_hash_table_f) <GGA_NONE>: For forced local
+ symbols bump up `max_local_dynindx' rather than
+ `max_non_got_dynindx'.
+
+2017-02-02 Maciej W. Rozycki <macro@imgtec.com>
+
* elfxx-mips.c (mips_elf_hash_sort_data): Convert the
`min_got_dynindx', `max_unref_got_dynindx' and
`max_non_got_dynindx' members to the `bfd_size_type' data type.
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index 1b93a95..c184d2e 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -315,7 +315,10 @@ struct mips_elf_hash_sort_data
with a GOT entry that is not referenced (e.g., a dynamic symbol
with dynamic relocations pointing to it from non-primary GOTs). */
bfd_size_type max_unref_got_dynindx;
- /* The greatest dynamic symbol table index not corresponding to a
+ /* The greatest dynamic symbol table index corresponding to a local
+ symbol. */
+ bfd_size_type max_local_dynindx;
+ /* The greatest dynamic symbol table index corresponding to an external
symbol without a GOT entry. */
bfd_size_type max_non_got_dynindx;
};
@@ -3846,11 +3849,15 @@ mips_elf_sort_hash_table (bfd *abfd, struct bfd_link_info *info)
hsd.max_unref_got_dynindx
= hsd.min_got_dynindx
= (htab->root.dynsymcount - g->reloc_only_gotno);
- hsd.max_non_got_dynindx = count_section_dynsyms (abfd, info) + 1;
+ /* Add 1 to local symbol indices to account for the mandatory NULL entry
+ at the head of the table; see `_bfd_elf_link_renumber_dynsyms'. */
+ hsd.max_local_dynindx = count_section_dynsyms (abfd, info) + 1;
+ hsd.max_non_got_dynindx = htab->root.local_dynsymcount + 1;
mips_elf_link_hash_traverse (htab, mips_elf_sort_hash_table_f, &hsd);
/* There should have been enough room in the symbol table to
accommodate both the GOT and non-GOT symbols. */
+ BFD_ASSERT (hsd.max_local_dynindx <= htab->root.local_dynsymcount + 1);
BFD_ASSERT (hsd.max_non_got_dynindx <= hsd.min_got_dynindx);
BFD_ASSERT (hsd.max_unref_got_dynindx == htab->root.dynsymcount);
BFD_ASSERT (htab->root.dynsymcount - hsd.min_got_dynindx == g->global_gotno);
@@ -3879,7 +3886,10 @@ mips_elf_sort_hash_table_f (struct mips_elf_link_hash_entry *h, void *data)
switch (h->global_got_area)
{
case GGA_NONE:
- h->root.dynindx = hsd->max_non_got_dynindx++;
+ if (h->root.forced_local)
+ h->root.dynindx = hsd->max_local_dynindx++;
+ else
+ h->root.dynindx = hsd->max_non_got_dynindx++;
break;
case GGA_NORMAL: