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136 Commits

Author SHA1 Message Date
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
Rafael Espindola
80faee82e6 Add content to the .hash section. 
This also sets DT_HASH.

With this simple shared libraries created by lld can be loaded by the dynamic
linker.

llvm-svn: 247625
 2015-09-14 22:08:55 +00:00
Rui Ueyama
9078f73fa0 Use C++11 member initializers. NFC. 
llvm-svn: 247613
 2015-09-14 20:32:41 +00:00
Rafael Espindola
601771ebc0 Start adding the .hash output section. 
It is still empty. Content will be added in the next patch.

llvm-svn: 247609
 2015-09-14 20:20:34 +00:00
Rafael Espindola
bfcdfb32af Correctly align sections. 
We have to align the start, not the end.

This should fix crashes on systems where memcpy enforces the expected
alignment.

llvm-svn: 247599
 2015-09-14 19:00:35 +00:00
Rafael Espindola
4340aad144 Start adding support for creating shared libraries. 
They are not fully functional yet, but this implements enough support for lld
itself to read them.

With that, delete the .so binary we were using for tests and start eating our
own dog food.

llvm-svn: 247487
 2015-09-11 22:42:45 +00:00
Rafael Espindola
1d12ab3db1 Fix handling of _start being undefined. 
We were crashing before.

llvm-svn: 247481
 2015-09-11 21:44:55 +00:00
Rafael Espindola
2e9eac13c7 Implement -rpath. 
llvm-svn: 247475
 2015-09-11 21:18:56 +00:00
Rafael Espindola
7010776db7 Implement the -dynamic-linker option. 
With this dynamic executables can be executed with just ./t instead of
/lib64/ld-2.20.so ./t

llvm-svn: 247446
 2015-09-11 18:49:42 +00:00
Rafael Espindola
d67bb26642 Add more information to a comment. 
llvm-svn: 247408
 2015-09-11 13:20:07 +00:00
Rafael Espindola
243d90f549 Add a DT_SYMTAB entry in the dynamic section. 
With this a trivial shared binary runs with the glibc dynamic linker:

LD_LIBRARY_PATH=.  /lib64/ld-2.20.so ./t

llvm-svn: 247370
 2015-09-11 01:14:39 +00:00
Rafael Espindola
fb815282d5 Create a dynamic symbol table. 
For now it includes every symbol in the regular table. Since we don't
create dynamic relocations yet, we don't have a good way of knowing which
symbols are actually needed.

llvm-svn: 247365
 2015-09-11 00:30:13 +00:00
Rafael Espindola
24d07fdd27 Cache the bss output section in the writer, not in the symbol table. 
There is soon going to be two symbol tables, but there will still be only one
output bss.

llvm-svn: 247363
 2015-09-11 00:10:11 +00:00
Rafael Espindola
dd34a4d3c5 Make a few details of the string and symbol table private. 
This is in preparation to adding a dynamic string table.

llvm-svn: 247355
 2015-09-10 22:49:06 +00:00
Rafael Espindola
65db630fe7 Fix a warning when building with gcc. 
It was

/Writer.cpp:119:45: warning: enumeral and non-enumeral type in conditional expression

llvm-svn: 247330
 2015-09-10 20:02:22 +00:00
Rafael Espindola
0a2e211ace Create a PT_LOAD program header for the start of the file. 
With this a trivial dynamic program works with the musl dynamic linker:

LD_LIBRARY_PATH=.  ~/musl/lib/libc.so ./t

llvm-svn: 247290
 2015-09-10 15:41:34 +00:00
Rafael Espindola
60252d8feb Change the load addr into something that works on linux x86_64. 
With this simple static programs run again.

llvm-svn: 247205
 2015-09-09 22:53:55 +00:00
Michael J. Spencer
1d299a8a9d [elf2] Assign output sections to PHDRs. 
This is a minimal implementation to produce legal output. Future patches will combine multiple compatible PT_LOADs.

llvm-svn: 247185
 2015-09-09 20:48:09 +00:00
Rafael Espindola
778562fc78 Add the DT_NEEDED entries to the dynamic table. 
llvm-svn: 247181
 2015-09-09 20:26:23 +00:00
Rafael Espindola
3f4228f613 Start adding content to the dynamic section. 
With this patch we create a dynamic string table (it is allocated, unlike
the regular one) and the dynamic section has a DT_STRTAB pointing to it.

llvm-svn: 247155
 2015-09-09 15:33:08 +00:00
Rafael Espindola
e438e07856 Create a dynamic segment. 
It is still empty. I will add content next.

llvm-svn: 247097
 2015-09-08 22:55:28 +00:00
Michael J. Spencer
ac5f048e09 [lld][elf2] Address review comments. 
llvm-svn: 247096
 2015-09-08 22:51:46 +00:00
Michael J. Spencer
546c64c733 [lld][elf2] Fix hard coded entry address. 
llvm-svn: 247089
 2015-09-08 22:34:57 +00:00
Rafael Espindola
18608a0a55 Simplify using namespaces and typedefs. NFC. 
llvm-svn: 247079
 2015-09-08 21:57:31 +00:00
Rafael Espindola
b9fe03d4a9 Revert "[lld][elf2] Fix hard coded entry address." 
This reverts commit r247073.

It broke

    lld :: elf2/basic32be.s
    lld :: elf2/basic64be.s

llvm-svn: 247077
 2015-09-08 21:32:44 +00:00