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160 Commits

Author SHA1 Message Date
Rafael Espindola
3ef3a4c9ff Start adding support for static programs using dynamic libraries. 
This is just enough for a hello world using a dynamic glibc.

llvm-svn: 248854
 2015-09-29 23:22:16 +00:00
Rafael Espindola
6a78fd5f41 This reverts commit r248845 and r248848. 
They broke elf2/basic-mips.s.

Revert "[elf2] Sort output sections."
Revert "[elf2] Fix build."

llvm-svn: 248851
 2015-09-29 23:19:25 +00:00
Michael J. Spencer
fe07bd67fd [elf2] Sort output sections. 
Sort by:
ALLOC
ALLOC && NOBITS
ALLOC & EXEC
ALLOC & EXEC && NOBITS
ALLOC & WRITE
ALLOC & WRITE && NOBITS
<nothing> (ignoring NOBITS)

The dynamic section is finalized early because it adds strings to the dynamic string table, which comes before the dynamic table.

llvm-svn: 248845
 2015-09-29 23:05:40 +00:00
Rafael Espindola
085a8f5ea7 Don't include fully resolved relocations in the dynamic relocation table. 
llvm-svn: 248731
 2015-09-28 20:18:40 +00:00
Rafael Espindola
46e01554b1 Add support for got/ptl referring to symbols defined in .o files. 
llvm-svn: 248730
 2015-09-28 19:48:34 +00:00
Rafael Espindola
551dfd8818 Implement --noinhibit-exec. 
Patch by George Rimar!

llvm-svn: 248605
 2015-09-25 19:24:57 +00:00
Rafael Espindola
0e604f913a Add support for creating the symbols __init_array_start and __init_array_end. 
llvm-svn: 248604
 2015-09-25 18:56:53 +00:00
Rafael Espindola
cd076f0113 Move more logic to getSymVA to avoid code duplication. 
llvm-svn: 248599
 2015-09-25 18:19:03 +00:00
Rafael Espindola
d13d9606fb Inline function into only use. 
llvm-svn: 248572
 2015-09-25 15:08:44 +00:00
Davide Italiano
85121bbf24 [ELF2] Use static non-member function when it suffices. 
Pointed out by Rui Ueyama.

llvm-svn: 248559
 2015-09-25 03:56:11 +00:00
Rui Ueyama
3f4ec66624 ELF2: Use lambdas instead of named functions. 
They are short and used only once, so writing them where they are used
is better.

llvm-svn: 248558
 2015-09-25 03:48:25 +00:00
Rui Ueyama
4c4993bba6 Remove dead code. 
llvm-svn: 248557
 2015-09-25 03:38:56 +00:00
Davide Italiano
aa7c533ec3 [ELF2] Fix binaries so they actually run on FreeBSD. 
Since FreeBSD 4.1, the kernel expects binaries to be marked with
ELFOSABI_FREEBSD in the ELF header to exec() them. LLD unconditionally 
sets OSABI to ELF_OSABINONE, and everything linked with it won't run 
on FreeBSD (unless explicitly rebranded).

Example:
% ./aarch64-hello
ELF binary type "0" not known.
zsh: exec format error: ./aarch64-hello

FreeBSD could be modified to accept ELF_OSABINONE, but that would break all
existing binaries, so the kernel needs to support both ABINONE and ABIFREEBSD.
I plan to push this change in FreeBSD one day, which, unfortunately, is 
not today. This code patches lld so it sets the header field correctly.

For completeness, the rationale of this change is explained in the FreeBSD 
commit message, and it's apparently to pleasee binutils maintainers at the time.
https://svnweb.freebsd.org/base?view=revision&revision=59342

Differential Revision:	 http://reviews.llvm.org/D13140

llvm-svn: 248554
 2015-09-25 01:59:13 +00:00
Rafael Espindola
e1901cc33d Simplify memory management by having ELFData contain a ELFObj. 
llvm-svn: 248502
 2015-09-24 15:11:50 +00:00
Davide Italiano
d75d3b94fd [ELF2] Add support for -discard-none. 
Differential Revision:	http://reviews.llvm.org/D13083

llvm-svn: 248499
 2015-09-24 15:08:23 +00:00
Rafael Espindola
cdfecffd80 Add support for relocating R_X86_64_GOTPCREL. 
llvm-svn: 248425
 2015-09-23 20:08:25 +00:00
Rafael Espindola
c2d211994d Create the .bss section early so that we don't have to set it after the fact. 
llvm-svn: 248412
 2015-09-23 18:25:05 +00:00
Michael J. Spencer
2812aa82d0 [elf2] Pass BSSSec to the relocation handling code differently. Don't store it in the symbol. 
llvm-svn: 248393
 2015-09-23 16:57:31 +00:00
Rafael Espindola
6173f848b9 Print more information about undefined symbols. 
llvm-svn: 248382
 2015-09-23 14:37:01 +00:00
Rafael Espindola
05a3dd2cba Implement --export-dynamic. 
llvm-svn: 248347
 2015-09-22 23:38:23 +00:00
Rafael Espindola
01205f79a4 Start adding target abstractions. 
This is just enough to get PLT working on 32 bit x86.

The idea behind using a virtual interface is that it should be easy to
convert any of the functions to template parameters if any turns out to be
performance critical.

llvm-svn: 248308
 2015-09-22 18:19:46 +00:00
Rafael Espindola
7167585c94 Remove the Chunk terminology from ELF. 
llvm-svn: 248229
 2015-09-22 00:16:19 +00:00
Rafael Espindola
5805c4f509 Move OutputSectionBase and derived classes out of Writer.cpp. 
The file was getting a bit too big and OutputSection is a central enough
concept in ELF linking to justify its own file.

llvm-svn: 248214
 2015-09-21 21:38:08 +00:00
Davide Italiano
8ca741d51d [ELF2] Support relocs for local symbols 
Differential Revision:	 http://reviews.llvm.org/D12978

llvm-svn: 248196
 2015-09-21 19:30:11 +00:00
Rafael Espindola
53d5cea648 Rename SectionChunk to InputSection. 
This is more consistent with OutputSection. This is also part of removing
the "Chunk" term from the ELF linker, since we just have input/output sections
and program headers.

llvm-svn: 248183
 2015-09-21 17:47:00 +00:00
Rafael Espindola
eb79273158 Start adding support for PLT. 
For now this doesn't support lazy symbol resolution, but is enough to link
and run a program with

jmp foo@PLT

llvm-svn: 248165
 2015-09-21 15:11:29 +00:00
Davide Italiano
5445b2de50 [ELF2] Implement support for -discard-locals. 
This is not on by default, but it may make sense to change it in future.

llvm-svn: 248133
 2015-09-20 21:58:12 +00:00
Michael J. Spencer
9779535c5d [elf2] Relocate against undefined weak symbols. 
llvm-svn: 248056
 2015-09-18 22:26:13 +00:00
Michael J. Spencer
658dccd1c8 [elf2] Relocate against common symbols. 
llvm-svn: 248054
 2015-09-18 22:13:25 +00:00
Michael J. Spencer
9567495154 [elf2] Convert if/else cascade into a covered switch. NFC. 
llvm-svn: 248049
 2015-09-18 21:48:38 +00:00
Rafael Espindola
5c2310c30c Start adding support for creating the GOT. 
With this a program can call into a shared library with

  jmp *foo@GOTPCREL(%rip)

llvm-svn: 247992
 2015-09-18 14:40:19 +00:00
Davide Italiano
b5b47b432b [ELF2] Fill up local symbols fields correctly. 
Differential Revision:	http://reviews.llvm.org/D12944

llvm-svn: 247960
 2015-09-18 01:08:17 +00:00
Rafael Espindola
8315b1c995 Remove dead member variable. 
llvm-svn: 247949
 2015-09-17 21:34:32 +00:00
Michael J. Spencer
2f0082424f [elf2] Combine adjacent compatible OutputSections in PT_LOADs. 
llvm-svn: 247925
 2015-09-17 19:58:07 +00:00
Rafael Espindola
40102eb27f Use a MapVector to output symbols in a deterministic order. 
We used to sort the symbols at the very end, but we need to know the order
earlier so that we can create reference to them in the dynamic relocations.

Thanks to Igor Kudrin for pointing out the problem.

llvm-svn: 247911
 2015-09-17 18:26:25 +00:00
Rafael Espindola
67a5da60ed Add support of Elf_Rel dynamic relocations. 
llvm-svn: 247888
 2015-09-17 14:02:10 +00:00
Denis Protivensky
18add764f0 [ELF2] Fix typo in RelocationSection::hasRelocs method 
llvm-svn: 247878
 2015-09-17 09:54:29 +00:00
Rafael Espindola
eade07ba59 Start adding support for Elf_Rel. 
I don't intend to add full i686 support right now, just make sure we have all
the infrastructure in place for it.

llvm-svn: 247858
 2015-09-16 21:57:07 +00:00
Davide Italiano
6d328d3841 [ELF2] Initial support for local symbols. 
Symbol table is now populated correctly, but some fields are missing,
they'll be added in the future. This patch also adds --discard-all
flag, which was the default behavior until now.

Differential Revision:   http://reviews.llvm.org/D12874

llvm-svn: 247849
 2015-09-16 20:45:57 +00:00
Rafael Espindola
2b92d8f184 Move code computing NumEntries to finalize. 
When DynamicSection is constructed we still don't know if there will be
any dynamic relocations or not.

llvm-svn: 247838
 2015-09-16 19:26:31 +00:00
Rafael Espindola
3887ebfc21 Add DT_RELA and DT_RELASZ to the dynamic table. 
llvm-svn: 247837
 2015-09-16 18:52:42 +00:00
Rafael Espindola
19e3889dba Start creating dynamic relocations. 
For now we don't create got/plt and only Elf_Rela is supported.

llvm-svn: 247811
 2015-09-16 15:54:15 +00:00
Michael J. Spencer
141dd91ac5 [elf2] Simplify overflow checks. 
llvm-svn: 247768
 2015-09-16 02:02:04 +00:00
Michael J. Spencer
75e5fda3de [elf2] Add R_X86_64_32S. 
llvm-svn: 247758
 2015-09-16 00:24:19 +00:00
Michael J. Spencer
dff84070da [elf2] Add error checking for the R_X86_64_32 relocation. 
llvm-svn: 247745
 2015-09-15 23:36:30 +00:00
Michael J. Spencer
3c1ac0a17a [elf2] Relocate absolute symbols. 
llvm-svn: 247738
 2015-09-15 23:12:02 +00:00
Rafael Espindola
e6451d9e74 Replace isa+cast with dyn_cast. NFC. 
llvm-svn: 247691
 2015-09-15 14:08:11 +00:00
Rafael Espindola
a5c97d9025 Add support for R_X86_64_64. 
llvm-svn: 247688
 2015-09-15 13:52:06 +00:00
Rui Ueyama
b73002fb4e ELF2: Simplify by removing temporary variables. 
llvm-svn: 247652
 2015-09-15 01:03:58 +00:00
Rafael Espindola
c92d28d427 Simplify, NFC. 
Thanks to Rui for the suggestion.

llvm-svn: 247637
 2015-09-14 23:28:02 +00:00