Commit Graph

1516 Commits

Author SHA1 Message Date
Rui Ueyama bf3fd7c9a0 ELF2: Emit a PT_PHDR header as the first entry of the program header.
PT_PHDR entry points to the program header itself.

llvm-svn: 249839
2015-10-09 15:31:49 +00:00
Rafael Espindola d540919ff1 Revert "[ELF2] - Implemented rel[a].plt sections"
This reverts commit r249816.

It broke building llvm with lld:

$ ./bin/FileCheck
./bin/FileCheck: error while loading shared libraries: unexpected PLT reloc type 0x06

I think the only thing that is wrong with this patch is that it is too soon.

The plt we create (and its relocs) don't support lazy loading, so they have
to be relocated as ordinary dynamic relocations.

llvm-svn: 249835
2015-10-09 14:25:49 +00:00
Igor Kudrin 65bddeaacf [ELF2] Check for TLS mismatch in symbol resolution.
The linker should generate an error if a TLS symbol is resolved
for a non-TLS reference and vice versa.

The patch addresses PR24244 (https://llvm.org/bugs/show_bug.cgi?id=24244)

Differential Revision: http://reviews.llvm.org/D13550

llvm-svn: 249817
2015-10-09 09:58:39 +00:00
George Rimar b352b9ce69 [ELF2] - Implemented rel[a].plt sections
.rela.plt contains list of elements in the PLT, which are liable to the relocation during the dynamic linking.

Differential Revision: http://reviews.llvm.org/D13569

llvm-svn: 249816
2015-10-09 09:58:08 +00:00
Hal Finkel e3c2626aa4 [ELF2] Make the system page size a target-dependent property
The required page alignment is different on different targets. On PowerPC, for
example, we need 64K pages (the loader won't set different permissions on a
finer granularity than that). I've set the existing targets to what I believe
to be the correct values, and have updated the regression tests accordingly.

llvm-svn: 249760
2015-10-08 22:23:54 +00:00
Hal Finkel 4729064a1c Revert: r249728 - Roll back r249726 and r249723 because they broke buildbots.
Reapply r249726 (and r249723), hopefully with the correct test fixups this time.

Original commit message:

Address a FIXME in ELF/Writer.cpp: Make VAStart a target-dependent property.
I've set the values for the existing targets to what I believe to be the
correct values, and updated the regression tests accordingly.

llvm-svn: 249752
2015-10-08 21:25:04 +00:00
Rui Ueyama 1890799f0c Re-apply r249630: ELF2: Use `-flavor gnu2` after `not` to fix Windows buildbot.
Thanks to George Rimar's r249696, `not` is now able to find ld.lld2
executable correctly.

llvm-svn: 249746
2015-10-08 20:57:29 +00:00
Rui Ueyama 7114f0597b Roll back r249726 and r249723 because they broke buildbots.
llvm-svn: 249728
2015-10-08 20:00:02 +00:00
Hal Finkel 1cbf51a41b [ELF2] Add missing test fixup after r249723
llvm-svn: 249726
2015-10-08 19:53:12 +00:00
Hal Finkel eb84ce8bd1 [ELF2] Make VAStart a target-dependent property
Address a FIXME in ELF/Writer.cpp: Make VAStart a target-dependent property.
I've set the values for the existing targets to what I believe to be the
correct values, and updated the regression tests accordingly.

llvm-svn: 249723
2015-10-08 19:36:39 +00:00
George Rimar 48570f1f4b [ELF2] Test for i686 relocations updated with comments.
Reviewed by Rafael. 

llvm-svn: 249719
2015-10-08 18:58:10 +00:00
Rafael Espindola 79e4452535 Test that we handle empty archives.
This was failing before 249709.

llvm-svn: 249710
2015-10-08 18:10:53 +00:00
Davide Italiano 68a39a6565 [ELF2] Implement linker script SEARCH_DIR() directive.
llvm-svn: 249707
2015-10-08 17:51:41 +00:00
Simon Atanasyan 456bd05d97 [ELF2][mips] Support elf32ltsmip/elf32btsmip target emulation as the -m arguments
llvm-svn: 249683
2015-10-08 12:13:38 +00:00
Denis Protivensky 90c5099e8a [ELF2] Add ENTRY command to the linker script
Set ENTRY as an entry point if -e is not specified.

Differential Revision: http://reviews.llvm.org/D13509

llvm-svn: 249661
2015-10-08 06:48:38 +00:00
Davide Italiano 8d9ace60ca [ELF/AArch64] Add tests to verify we handle overflow correctly for relocs.
llvm-svn: 249634
2015-10-07 23:15:22 +00:00
Rui Ueyama f82a0eef13 ELF2: Use `-flavor gnu2` after `not` to fix Windows buildbot.
`not` command on Windows is not able to find an executable from PATH
if a given command already has an extension even if the extension is
not ".exe".

llvm-svn: 249630
2015-10-07 22:20:43 +00:00
George Rimar 730c27894a [ELF2] - fix to use PLT/GOT for DSO function calls (X86TargetInfo)
Differential Revision: http://reviews.llvm.org/D13522

llvm-svn: 249588
2015-10-07 18:46:13 +00:00
Rafael Espindola 87c647aee1 Remove remaining uses of "-flavor gnu2".
llvm-svn: 249582
2015-10-07 18:20:07 +00:00
Rui Ueyama 60fe7fcc6b ELF2: Use ld.lld2 instead of lld -flavor gnu2.
llvm-svn: 249573
2015-10-07 17:31:39 +00:00
George Rimar 97aad172b8 [ELF2] -z now option implemented
When generating an executable or shared library, mark it to tell the dynamic linker to resolve all symbols when the program is started, or when the shared library is linked to using dlopen, instead of deferring function call resolution to the point when the function is first called.

Differential Revision: http://reviews.llvm.org/D13468

llvm-svn: 249551
2015-10-07 15:00:21 +00:00
Denis Protivensky 1ef7b3ff55 [ELF2] Handle -m option
Parse and apply emulation given with -m option.
Check input files to match ELF type and machine architecture provided with -m.

Differential Revision: http://reviews.llvm.org/D13055

llvm-svn: 249529
2015-10-07 09:13:03 +00:00
Rafael Espindola cea0b3b45d Don't create dynamic relocations for weak undefined symbols.
llvm-svn: 249520
2015-10-07 04:22:55 +00:00
Rafael Espindola e782f673a8 Skip entries handled by the dynamic linker.
We were writing got entries in the first positions, not in the positions
corresponding to locally defined symbols.

llvm-svn: 249518
2015-10-07 03:56:05 +00:00
Rafael Espindola c05ad3dedb Create linker generated symbols earlier.
We were incorrectly deciding that a dynamic relocation was needed for them.

llvm-svn: 249512
2015-10-07 02:51:44 +00:00
Rafael Espindola cbffa8cc97 Add missing % to t2.so.
llvm-svn: 249505
2015-10-07 02:01:47 +00:00
Rafael Espindola 52dca345db Create simpler dynamic relocations for local symbols in got.
If the symbol is not preemptable, we can use a R_X86_64_RELATIVE.

llvm-svn: 249496
2015-10-07 00:58:20 +00:00
Rui Ueyama ee59282bfd ELF2: Implement OUTPUT() linker script directive.
llvm-svn: 249491
2015-10-07 00:25:09 +00:00
Rafael Espindola a662738e02 Don't create dynamic relocations when its known what the got points to.
llvm-svn: 249485
2015-10-06 23:56:53 +00:00
Rafael Espindola 4b81795c2a Update tests for upcoming change.
I am about to change lld to avoid creating unnecessary got entries for locally
defined symbols when creating executables.

Update tests that were depending on the current behavior.

llvm-svn: 249474
2015-10-06 21:52:48 +00:00
Michael J. Spencer f32446fb65 [elf2] Correctly determine if we should ignore missing __tls_get_addr.
llvm-svn: 249462
2015-10-06 20:39:09 +00:00
Davide Italiano aad4402097 [ELF2] Address r249428 post comit review. Style + test trim.
llvm-svn: 249451
2015-10-06 20:02:15 +00:00
Davide Italiano c39c75dee4 [ELF2] Implement --{enable, disable}-new-dtags options.
llvm-svn: 249428
2015-10-06 16:20:00 +00:00
Rafael Espindola 85a6e0f870 Never fetch members for weak undefined symbols.
We were still fetching them when the archive was seen first.

We should experiment with just letting lazy symbols get to compare, it
might be cleaner for ELF.

llvm-svn: 249417
2015-10-06 15:18:50 +00:00
Rafael Espindola b90582dbbd Avoid recursive calls to init (we would crash).
llvm-svn: 249412
2015-10-06 15:03:52 +00:00
Rafael Espindola 8614c566e2 Handle strong undefined symbols fetching members after a weak undefined.
This is a case that requires --start-group --end-group with regular ELF
linkers. Fortunately it is still possible to handle it with lazy symbols without
taking a second look at archives.

Thanks to Michael Spencer for the bug report.

llvm-svn: 249406
2015-10-06 14:33:58 +00:00
Rafael Espindola 03ab3368a0 External symbols need a full dynamic reloc, not R_X86_64_RELATIVE.
We were already doing the right thing if the symbol was seen in a shared
library, but not if it was completely missing.

llvm-svn: 249397
2015-10-06 12:39:58 +00:00
Michael J. Spencer 95538ca99a [elf2] Add __preinit_array, and __fini_array start and end symbols.
llvm-svn: 249367
2015-10-06 01:16:17 +00:00
Michael J. Spencer 4c46f57a49 [elf2] Ignore __tls_get_addr when static linking.
llvm-svn: 249365
2015-10-06 00:45:42 +00:00
Rafael Espindola 41127ad7af Fix R_X86_64_RELATIVE for local symbols that refer to other sections.
We were mixing up the relocated and target sections.

llvm-svn: 249360
2015-10-05 22:49:16 +00:00
Rafael Espindola 9c3e4d2af5 Handle a common symbol needing a R_X86_64_RELATIVE.
llvm-svn: 249357
2015-10-05 21:23:08 +00:00
Rafael Espindola 3c83e2bbfb Include existing addend when computing R_X86_64_RELATIVE.
llvm-svn: 249353
2015-10-05 21:09:37 +00:00
Rafael Espindola d75fbd221d Make this test a bit more strict.
Before the ADDR variables could match the empty string.

llvm-svn: 249350
2015-10-05 20:54:39 +00:00
Rafael Espindola ae24400424 Create R_X86_64_RELATIVE when needed.
The dynamic relocation code needs refactoring, but it is probably better
to do it with this test passing.

llvm-svn: 249340
2015-10-05 19:30:12 +00:00
Rafael Espindola d1cf421bd5 Don't copy STT_SECTION from the inputs.
This matches the behavior of gold and bfd ld.

llvm-svn: 249326
2015-10-05 16:25:43 +00:00
Rafael Espindola 4f674ed138 Include hidden and internal symbols in the regular symbol table.
This matches the behavior of bfd ld and gold. It is also convenient for
testing other changes.

llvm-svn: 249323
2015-10-05 15:24:04 +00:00
Igor Kudrin b1f2b51a89 [ELF2] Add DT_INIT and DT_FINI dynamic table entries
The entries are added if there are "_init" or "_fini" entries in
the symbol table respectively. According to the behavior of ld,
entries are inserted even for undefined symbols.

Symbol names can be overridden by using -init and -fini command
line switches. If used, these switches neither add new symbol table
entries nor require those symbols to be resolved.

Differential Revision: http://reviews.llvm.org/D13385

llvm-svn: 249297
2015-10-05 10:29:46 +00:00
Denis Protivensky 22220d5d5f [ELF2] Add --undefined option
Add symbol specified with -u as undefined which may cause additional
object files from archives to be linked into the resulting binary.

Differential Revision: http://reviews.llvm.org/D13345

llvm-svn: 249295
2015-10-05 09:43:57 +00:00
Davide Italiano b00e523d00 [ELF2/AArch64] R_AARCH64_ABS{16,32} can fail.
Add tests to ensure we handle this case this case gracefully.

llvm-svn: 249255
2015-10-04 01:08:58 +00:00
Davide Italiano df88f968e3 [ELF2/AArch64] Add support for AARCH64_ABS{16,32,64} relocations.
I saw these in the wild while trying to link shared libraries.

llvm-svn: 249254
2015-10-04 00:59:16 +00:00