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[ARM] 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
	* elf32-arm.c (elf_backend_extern_protected_data): Define.

ld/testsuite:
	PR ld/18705
	* ld-arm/protected-data.d: New.
	* ld-arm/protected-data.s: New.
	* ld-arm/arm-elf.exp: Add new test.
This commit is contained in:
Szabolcs Nagy 2015-07-27 11:45:27 +01:00
parent 0c096ed760
commit b68a20d667
6 changed files with 47 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
* elf32-arm.c (elf_backend_extern_protected_data): Define.
2015-07-25 H.J. Lu <hongjiu.lu@intel.com>
PR ld/18718

1
bfd/elf32-arm.c
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@ -16236,6 +16236,7 @@ elf32_arm_get_synthetic_symtab (bfd *abfd,
#define elf_backend_default_use_rela_p 0
#define elf_backend_got_header_size 12
#define elf_backend_extern_protected_data 1
#undef elf_backend_obj_attrs_vendor
#define elf_backend_obj_attrs_vendor "aeabi"

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-arm/protected-data.d: New.
* ld-arm/protected-data.s: New.
* ld-arm/arm-elf.exp: Add new test.
2015-07-26 H.J. Lu <hongjiu.lu@intel.com>
PR ld/18718

1
ld/testsuite/ld-arm/arm-elf.exp
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@ -904,3 +904,4 @@ if { ![istarget "arm*-*-nacl*"] } {
}
run_dump_test "unresolved-2"
run_dump_test "gc-hidden-1"
run_dump_test "protected-data"

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

29
ld/testsuite/ld-arm/protected-data.s Normal file
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@ -0,0 +1,29 @@
.syntax unified
.data
.protected var
.global var
.align 2
.type var, %object
.size var, 4
var:
.word 1
.text
.align 2
.global getaddr
.thumb
.thumb_func
.type getaddr, %function
getaddr:
ldr r3, 2f
ldr r2, 2f+4
1:
add r3, pc
ldr r0, [r3, r2]
bx lr
.align 2
2:
.word _GLOBAL_OFFSET_TABLE_-(1b+4)
.word var(GOT)
.size getaddr, .-getaddr