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[AArch64] Fix extern protected data handling

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Emit *GLOB_DAT instead of *RELATIVE relocs for protected data
in shared objects.

This is needed for the fix of glibc bug 17711:
https://sourceware.org/bugzilla/show_bug.cgi?id=17711

bfd:
	PR ld/18705
	* elfnn-aarch64.c (elf_backend_extern_protected_data): Define.

ld/testsuite:
	PR ld/18705
	* ld-aarch64/protected-data.d: New.
	* ld-aarch64/protected-data.s: New.
	* ld-aarch64/aarch64-elf.exp: Add new test.
This commit is contained in:
Szabolcs Nagy
2015-07-27 11:48:48 +01:00
parent b68a20d667
commit 32f573bcb3
6 changed files with 36 additions and 0 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com>
PR ld/18705
* elfnn-aarch64.c (elf_backend_extern_protected_data): Define.
2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com> 2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com>
PR ld/18705 PR ld/18705

1
bfd/elfnn-aarch64.c
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@ -8655,6 +8655,7 @@ const struct elf_size_info elfNN_aarch64_size_info =
#define elf_backend_rela_normal 1 #define elf_backend_rela_normal 1
#define elf_backend_got_header_size (GOT_ENTRY_SIZE * 3) #define elf_backend_got_header_size (GOT_ENTRY_SIZE * 3)
#define elf_backend_default_execstack 0 #define elf_backend_default_execstack 0
#define elf_backend_extern_protected_data 1
#undef elf_backend_obj_attrs_section #undef elf_backend_obj_attrs_section
#define elf_backend_obj_attrs_section ".ARM.attributes" #define elf_backend_obj_attrs_section ".ARM.attributes"

7
ld/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com>
PR ld/18705
* ld-aarch64/protected-data.d: New.
* ld-aarch64/protected-data.s: New.
* ld-aarch64/aarch64-elf.exp: Add new test.
2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com> 2015-07-27 Szabolcs Nagy <szabolcs.nagy@arm.com>
PR ld/18705 PR ld/18705

1
ld/testsuite/ld-aarch64/aarch64-elf.exp
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@ -157,6 +157,7 @@ run_dump_test "gc-relocs-257"
run_dump_test "pr17415" run_dump_test "pr17415"
run_dump_test "tprel_g2_overflow" run_dump_test "tprel_g2_overflow"
run_dump_test "tprel_add_lo12_overflow" run_dump_test "tprel_add_lo12_overflow"
run_dump_test "protected-data"
# ifunc tests # ifunc tests
run_dump_test "ifunc-1" run_dump_test "ifunc-1"

4
ld/testsuite/ld-aarch64/protected-data.d Normal file
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@ -0,0 +1,4 @@
#ld: -shared
#readelf: -r -W
#...
.* R_AARCH64_GLOB_DAT .* var.*

18
ld/testsuite/ld-aarch64/protected-data.s Normal file
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@ -0,0 +1,18 @@
.data
.protected var
.global var
.align 2
.type var, %object
.size var, 4
var:
.word 1
.text
.align 2
.global getaddr
.type getaddr, %function
getaddr:
adrp x0, :got:var
ldr x0, [x0, #:got_lo12:var]
ret
.size getaddr, .-getaddr