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[AArch64] Optimize .gnu.hash table size for executable

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bfd/
	* elfnn-aarch64.c (elf_aarch64_hash_symbol): New function.
	(elf_backend_hash_symbol): Define.

ld/
	* testsuite/ld-aarch64/aarch64-elf.exp (aarch64elflinktests): New tests.
	* testsuite/ld-aarch64/func-in-so.s: New test source file.
	* testsuite/ld-aarch64/func-sym-hash-opt.s: Likewise.
	* testsuite/ld-aarch64/func-sym-hash-opt.d: New expected test result.
This commit is contained in:
Jiong Wang 2017-01-20 13:30:32 +00:00
parent add3afb219
commit 7f784814df
7 changed files with 53 additions and 0 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2017-01-20 Jiong Wang <jiong.wang@arm.com>
* elfnn-aarch64.c (elf_aarch64_hash_symbol): New function.
(elf_backend_hash_symbol): Define.
2017-01-18 Maciej W. Rozycki <macro@imgtec.com>
PR ld/20828

17
bfd/elfnn-aarch64.c
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@ -2708,6 +2708,22 @@ elfNN_aarch64_stub_name (const asection *input_section,
return stub_name;
}
/* Return TRUE if symbol H should be hashed in the `.gnu.hash' section. For
executable PLT slots where the executable never takes the address of those
functions, the function symbols are not added to the hash table. */
static bfd_boolean
elf_aarch64_hash_symbol (struct elf_link_hash_entry *h)
{
if (h->plt.offset != (bfd_vma) -1
&& !h->def_regular
&& !h->pointer_equality_needed)
return FALSE;
return _bfd_elf_hash_symbol (h);
}
/* Look up an entry in the stub hash. Stub entries are cached because
creating the stub name takes a bit of time. */
@ -9412,6 +9428,7 @@ const struct elf_size_info elfNN_aarch64_size_info =
#define elf_backend_got_header_size (GOT_ENTRY_SIZE * 3)
#define elf_backend_default_execstack 0
#define elf_backend_extern_protected_data 1
#define elf_backend_hash_symbol elf_aarch64_hash_symbol
#undef elf_backend_obj_attrs_section
#define elf_backend_obj_attrs_section ".ARM.attributes"

7
ld/ChangeLog
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@ -1,3 +1,10 @@
2017-01-20 Jiong Wang <jiong.wang@arm.com>
* testsuite/ld-aarch64/aarch64-elf.exp (aarch64elflinktests): New tests.
* testsuite/ld-aarch64/func-in-so.s: New test source file.
* testsuite/ld-aarch64/func-sym-hash-opt.s: Likewise.
* testsuite/ld-aarch64/func-sym-hash-opt.d: New expected test result.
2017-01-20 Andrew Burgess <andrew.burgess@embecosm.com>
* testsuite/ld-elf/eh-frame-hdr.d: Update expected results.

5
ld/testsuite/ld-aarch64/aarch64-elf.exp
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@ -323,6 +323,11 @@ set aarch64elflinktests {
{} "copy-reloc-so.so"}
{"ld-aarch64/exe with copy relocation" "-e0 tmpdir/copy-reloc-so.so" "" ""
{copy-reloc-exe.s} {{objdump -R copy-reloc.d}} "copy-reloc"}
{"ld-aarch64/so with global func" "-shared" "" "" {func-in-so.s}
{} "func-in-so.so"}
{"ld-aarch64/func sym hash opt for exe"
"-e0 --hash-style=gnu tmpdir/func-in-so.so" "" ""
{func-sym-hash-opt.s} {{readelf --dyn-sym func-sym-hash-opt.d}} "hash-opt"}
}
run_ld_link_tests $aarch64elflinktests

6
ld/testsuite/ld-aarch64/func-in-so.s Normal file
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@ -0,0 +1,6 @@
.text
.align 2
.global dec
.type dec, %function
dec:
ret

6
ld/testsuite/ld-aarch64/func-sym-hash-opt.d Normal file
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@ -0,0 +1,6 @@
Symbol table '.dynsym' contains .* entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 FUNC GLOBAL DEFAULT UND dec
#...

7
ld/testsuite/ld-aarch64/func-sym-hash-opt.s Normal file
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@ -0,0 +1,7 @@
.text
.align 2
.global main
.type main, %function
main:
bl dec
ret