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Handle local IFUNC symbols in shared object

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Increment PLT reference count for locally defined local IFUNC symbols
in shared object since STT_GNU_IFUNC symbol must go through PLT even
if it is locally defined and undefined symbol may turn out to be a
STT_GNU_IFUNC symbol later.

bfd/

	PR ld/19784
	* elf32-i386.c (elf_i386_check_relocs): Increment PLT reference
	count for locally defined local IFUNC symbols in shared object.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.

ld/

	PR ld/19784
	* testsuite/ld-i386/i386.exp: Remove pr19636-2e-nacl test.
	* testsuite/ld-i386/pr19636-2e-nacl.d: Moved to ...
	* testsuite/ld-i386/pr19636-2e.d: Here.  Remove notarget.
	* testsuite/ld-ifunc/ifunc.exp: Run PR ld/19784 tests.
	* testsuite/ld-ifunc/pass.out: New file.
	* testsuite/ld-ifunc/pr19784a.c: Likewise.
	* testsuite/ld-ifunc/pr19784b.c: Likewise.
	* testsuite/ld-ifunc/pr19784c.c: Likewise.
This commit is contained in:
H.J. Lu
2016-03-08 09:42:01 -08:00
parent 205ac18577
commit d1ed1c7d69
12 changed files with 110 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
2016-03-08 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19784
* elf32-i386.c (elf_i386_check_relocs): Increment PLT reference
count for locally defined local IFUNC symbols in shared object.
* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.
2016-03-08 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19579

10
bfd/elf32-i386.c
View File

@ -1808,7 +1808,15 @@ elf_i386_check_relocs (bfd *abfd,
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
do_relocation:
if (h != NULL && bfd_link_executable (info))
/* STT_GNU_IFUNC symbol must go through PLT even if it is
locally defined and undefined symbol may turn out to be
a STT_GNU_IFUNC symbol later. */
if (h != NULL
&& (bfd_link_executable (info)
|| ((h->type == STT_GNU_IFUNC
|| h->root.type == bfd_link_hash_undefweak
|| h->root.type == bfd_link_hash_undefined)
&& SYMBOLIC_BIND (info, h))))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this

10
bfd/elf64-x86-64.c
View File

@ -1999,7 +1999,15 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
pointer:
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
if (h != NULL && bfd_link_executable (info))
/* STT_GNU_IFUNC symbol must go through PLT even if it is
locally defined and undefined symbol may turn out to be
a STT_GNU_IFUNC symbol later. */
if (h != NULL
&& (bfd_link_executable (info)
|| ((h->type == STT_GNU_IFUNC
|| h->root.type == bfd_link_hash_undefweak
|| h->root.type == bfd_link_hash_undefined)
&& SYMBOLIC_BIND (info, h))))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this

12
ld/ChangeLog
View File

@ -1,3 +1,15 @@
2016-03-08 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19784
* testsuite/ld-i386/i386.exp: Remove pr19636-2e-nacl test.
* testsuite/ld-i386/pr19636-2e-nacl.d: Moved to ...
* testsuite/ld-i386/pr19636-2e.d: Here. Remove notarget.
* testsuite/ld-ifunc/ifunc.exp: Run PR ld/19784 tests.
* testsuite/ld-ifunc/pass.out: New file.
* testsuite/ld-ifunc/pr19784a.c: Likewise.
* testsuite/ld-ifunc/pr19784b.c: Likewise.
* testsuite/ld-ifunc/pr19784c.c: Likewise.
2016-03-08 H.J. Lu <hongjiu.lu@intel.com>
PR ld/19774

1
ld/testsuite/ld-i386/i386.exp
View File

@ -337,7 +337,6 @@ run_dump_test "pr19636-2c-nacl"
run_dump_test "pr19636-2d"
run_dump_test "pr19636-2d-nacl"
run_dump_test "pr19636-2e"
run_dump_test "pr19636-2e-nacl"
run_dump_test "pr19636-3a"
run_dump_test "pr19636-3b"
run_dump_test "pr19636-3c"

21
ld/testsuite/ld-i386/pr19636-2e-nacl.d
View File

@ -1,21 +0,0 @@
#source: pr19636-2.s
#as: --32 -mrelax-relocations=no
#ld: -shared -Bsymbolic -m elf_i386
#readelf : -r --wide --dyn-syms
#target: i?86-*-nacl* x86_64-*-nacl*
Relocation section '\.rel\.dyn' at offset [0x0-9a-f]+ contains 3 entries:
+Offset +Info +Type +Sym. Value +Symbol's Name
[0-9a-f]+ +[0-9a-f]+ +R_386_32 +0+ +func
[0-9a-f]+ +[0-9a-f]+ +R_386_PC32 +0+ +func
[0-9a-f]+ +[0-9a-f]+ +R_386_GLOB_DAT +0+ +func
Relocation section '\.rel\.plt' at offset [0x0-9a-f]+ contains 1 entries:
+Offset +Info +Type +Sym. Value +Symbol's Name
[0-9a-f]+ +[0-9a-f]+ +R_386_JUMP_SLOT +0+ +func
Symbol table '\.dynsym' contains [0-9]+ entries:
+Num: +Value +Size Type +Bind +Vis +Ndx Name
#...
+[0-9]+: +[a-f0-9]+ +0 +NOTYPE +WEAK +DEFAULT +UND +func
#pass

5
ld/testsuite/ld-i386/pr19636-2e.d
View File

@ -2,7 +2,6 @@
#as: --32 -mrelax-relocations=no
#ld: -shared -Bsymbolic -m elf_i386
#readelf : -r --wide --dyn-syms
#notarget: i?86-*-nacl* x86_64-*-nacl*
Relocation section '\.rel\.dyn' at offset [0x0-9a-f]+ contains 3 entries:
+Offset +Info +Type +Sym. Value +Symbol's Name
@ -10,6 +9,10 @@ Relocation section '\.rel\.dyn' at offset [0x0-9a-f]+ contains 3 entries:
[0-9a-f]+ +[0-9a-f]+ +R_386_PC32 +0+ +func
[0-9a-f]+ +[0-9a-f]+ +R_386_GLOB_DAT +0+ +func
Relocation section '\.rel\.plt' at offset [0x0-9a-f]+ contains 1 entries:
+Offset +Info +Type +Sym. Value +Symbol's Name
[0-9a-f]+ +[0-9a-f]+ +R_386_JUMP_SLOT +0+ +func
Symbol table '\.dynsym' contains [0-9]+ entries:
+Num: +Value +Size Type +Bind +Vis +Ndx Name
#...

40
ld/testsuite/ld-ifunc/ifunc.exp
View File

@ -505,6 +505,30 @@ run_cc_link_tests [list \
{} \
"libpr18841c.so" \
] \
[list \
"Build libpr19784a.so" \
"-shared -Wl,-Bsymbolic-functions" \
"-fPIC -O2 -g" \
{ pr19784b.c pr19784c.c } \
{} \
"libpr19784a.so" \
] \
[list \
"Build libpr19784b.so" \
"-shared -Wl,-Bsymbolic-functions" \
"-fPIC -O2 -g" \
{ pr19784c.c pr19784b.c } \
{} \
"libpr19784b.so" \
] \
[list \
"Build pr19784a.o" \
"" \
"" \
{ pr19784a.c } \
"" \
"" \
] \
]
run_ld_link_exec_tests [] [list \
@ -532,4 +556,20 @@ run_ld_link_exec_tests [] [list \
"pr18841c" \
"pr18841.out" \
] \
[list \
"Run pr19784a" \
"tmpdir/pr19784a.o tmpdir/libpr19784a.so" \
"" \
{ dummy.c } \
"pr19784a" \
"pass.out" \
] \
[list \
"Run pr19784b" \
"--as-needed tmpdir/pr19784a.o tmpdir/libpr19784b.so" \
"" \
{ dummy.c } \
"pr19784b" \
"pass.out" \
] \
]

1
ld/testsuite/ld-ifunc/pass.out Normal file
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@ -0,0 +1 @@
PASS

6
ld/testsuite/ld-ifunc/pr19784a.c Normal file
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@ -0,0 +1,6 @@
void bar(void);
int main(void)
{
bar();
return 0;
}

11
ld/testsuite/ld-ifunc/pr19784b.c Normal file
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@ -0,0 +1,11 @@
int foo (int x) __attribute__ ((ifunc ("resolve_foo")));
static int foo_impl(int x)
{
return x;
}
void *resolve_foo (void)
{
return (void *) foo_impl;
}

11
ld/testsuite/ld-ifunc/pr19784c.c Normal file
View File

@ -0,0 +1,11 @@
#include <stdio.h>
extern void abort (void);
extern int foo (int) __attribute__ ((visibility("hidden")));
int bar()
{
if (foo (5) != 5)
abort ();
printf("PASS\n");
}