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Properly check symbol defined by assignment in linker script 

Symbol defined by a linker assignment may have type bfd_link_hash_new
or bfd_link_hash_undefined.  And h->def_regular is always set.
elf_i386_convert_load and elf_x86_64_convert_load should check
h->def_regular as well as bfd_link_hash_undefined and bfd_link_hash_new
to see if a symbol is defined by a linker script.

bfd/

	PR ld/19319
	* elf32-i386.c (elf_i386_convert_load): Check h->def_regular
	instead of bfd_link_hash_new.
	* elf64-x86-64.c (elf_x86_64_convert_load): Likewise.  Skip
	relocation overflow for bfd_link_hash_undefined and
	bfd_link_hash_new if h->def_regular is set.

ld/testsuite/

	PR ld/19319
	* ld-i386/i386.exp: Run pr19319 test.
	* ld-x86-64/x86-64.exp: Likewise.
	* ld-i386/pr19319.dd: New file.
	* ld-i386/pr19319a.S: Likewise.
	* ld-i386/pr19319b.S: Likewise.
	* ld-x86-64/pr19319.dd: Likewise.
	* ld-x86-64/pr19319a.S: Likewise.
	* ld-x86-64/pr19319b.S: Likewise.
This commit is contained in:
H.J. Lu 2015-12-01 14:45:51 -08:00
parent 974eac9d76
commit ead3d5427a
12 changed files with 121 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
bfd/ChangeLog
View File

@ -1,3 +1,12 @@
2015-12-01 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19319
* elf32-i386.c (elf_i386_convert_load): Check h->def_regular
instead of bfd_link_hash_new.
* elf64-x86-64.c (elf_x86_64_convert_load): Likewise. Skip
relocation overflow for bfd_link_hash_undefined and
bfd_link_hash_new if h->def_regular is set.
2015-12-01 Alan Modra <amodra@gmail.com>
* aoutx.h (adjust_sizes_and_vmas): Remove unused text_size and

10
bfd/elf32-i386.c
View File

@ -2976,11 +2976,11 @@ convert_branch:
if (h == htab->elf.hdynamic)
continue;
/* bfd_link_hash_new is set by an assignment in a linker
script in bfd_elf_record_link_assignment. */
if ((h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak
|| h->root.type == bfd_link_hash_new)
/* def_regular is set by an assignment in a linker script in
bfd_elf_record_link_assignment. */
if ((h->def_regular
|| h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
&& SYMBOL_REFERENCES_LOCAL (link_info, h))
{
convert_load:

19
bfd/elf64-x86-64.c
View File

@ -3127,18 +3127,21 @@ elf_x86_64_convert_load (bfd *abfd, asection *sec,
/* STT_GNU_IFUNC must keep GOTPCREL relocations. We also
avoid optimizing GOTPCREL relocations againt _DYNAMIC
since ld.so may use its link-time address. */
if ((h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak
|| h->root.type == bfd_link_hash_new)
if ((h->def_regular
|| h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
&& h->type != STT_GNU_IFUNC
&& h != htab->elf.hdynamic
&& SYMBOL_REFERENCES_LOCAL (link_info, h))
{
/* bfd_link_hash_new is set by an assignment in a linker
script in bfd_elf_record_link_assignment. FIXME: If
we ever get a linker error due relocation overflow, we
will skip this optimization. */
if (h->root.type == bfd_link_hash_new)
/* bfd_link_hash_new or bfd_link_hash_undefined is
set by an assignment in a linker script in
bfd_elf_record_link_assignment. FIXME: If we
ever get a linker error due relocation overflow,
we will skip this optimization. */
if (h->def_regular
&& (h->root.type == bfd_link_hash_new
|| h->root.type == bfd_link_hash_undefined))
goto convert;
tsec = h->root.u.def.section;
toff = h->root.u.def.value;

12
ld/testsuite/ChangeLog
View File

@ -1,3 +1,15 @@
2015-12-01 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19319
* ld-i386/i386.exp: Run pr19319 test.
* ld-x86-64/x86-64.exp: Likewise.
* ld-i386/pr19319.dd: New file.
* ld-i386/pr19319a.S: Likewise.
* ld-i386/pr19319b.S: Likewise.
* ld-x86-64/pr19319.dd: Likewise.
* ld-x86-64/pr19319a.S: Likewise.
* ld-x86-64/pr19319b.S: Likewise.
2015-11-11 Alan Modra <amodra@gmail.com>
Peter Bergner <bergner@vnet.ibm.com>

16
ld/testsuite/ld-i386/i386.exp
View File

@ -537,6 +537,22 @@ if { [isnative]
{{objdump {-dw} got1.dd}} \
"got1" \
] \
[list \
"Build pr19319.so" \
"-shared" \
"" \
{ pr19319a.S } \
"" \
"pr19319.so" \
] \
[list \
"Build pr19319" \
"-pie -nostdlib -nostartfiles tmpdir/pr19319.so" \
"" \
{ pr19319b.S } \
{{objdump {-dw} pr19319.dd}} \
"pr19319" \
] \
]
run_ld_link_exec_tests [] [list \

4
ld/testsuite/ld-i386/pr19319.dd Normal file
View File

@ -0,0 +1,4 @@
#...
[a-f0-9]+ <_start>:
[ ]*[a-f0-9]+: 8d 81 ([0-9a-f]{2} ){4} * lea 0x[a-f0-9]+\(%ecx\),%eax
#pass

11
ld/testsuite/ld-i386/pr19319a.S Normal file
View File

@ -0,0 +1,11 @@
.text
.globl foo
.type foo, @function
foo:
movl __start_my_section@GOT(%ecx), %eax
ret
.size foo, .-foo
.section my_section,"aw",@progbits
.align 8
.long 4660
.long 22136

11
ld/testsuite/ld-i386/pr19319b.S Normal file
View File

@ -0,0 +1,11 @@
.text
.globl _start
.type _start, @function
_start:
movl __start_my_section@GOT(%ecx), %eax
ret
.size _start, .-_start
.section my_section,"aw",@progbits
.align 8
.long 4660
.long 22136

4
ld/testsuite/ld-x86-64/pr19319.dd Normal file
View File

@ -0,0 +1,4 @@
#...
[a-f0-9]+ <_start>:
[ ]*[a-f0-9]+: 48 8d 05 ([0-9a-f]{2} ){4} * lea 0x[a-f0-9]+\(%rip\),%rax # [a-f0-9]+ <__start_my_section>
#pass

11
ld/testsuite/ld-x86-64/pr19319a.S Normal file
View File

@ -0,0 +1,11 @@
.text
.globl foo
.type foo, @function
foo:
movq __start_my_section@GOTPCREL(%rip), %rax
ret
.size foo, .-foo
.section my_section,"aw",@progbits
.align 8
.long 4660
.long 22136

11
ld/testsuite/ld-x86-64/pr19319b.S Normal file
View File

@ -0,0 +1,11 @@
.text
.globl _start
.type _start, @function
_start:
movq __start_my_section@GOTPCREL(%rip), %rax
ret
.size _start, .-_start
.section my_section,"aw",@progbits
.align 8
.long 4660
.long 22136

16
ld/testsuite/ld-x86-64/x86-64.exp
View File

@ -546,6 +546,22 @@ if { [isnative] && [which $CC] != 0 } {
{{objdump {-dw} gotpcrel1.dd}} \
"gotpcrel1" \
] \
[list \
"Build pr19319.so" \
"-shared" \
"" \
{ pr19319a.S } \
"" \
"pr19319.so" \
] \
[list \
"Build pr19319" \
"-pie -nostdlib -nostartfiles tmpdir/pr19319.so" \
"" \
{ pr19319b.S } \
{{objdump {-dw} pr19319.dd}} \
"pr19319" \
] \
]
run_ld_link_exec_tests [] [list \