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176 Commits

Author SHA1 Message Date
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
Rafael Espindola 37ecff14f4 Remove redundant "protected:". 
llvm-svn: 247797
 2015-09-16 13:47:45 +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
Rafael Espindola 7d4038dc5a Use the same typedef style for all Elf_* types. 
llvm-svn: 247680
 2015-09-15 12:43:09 +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 92b6c15cce Fix a copy and paste error. Sorry about that. 
llvm-svn: 247478
 2015-09-11 21:26:42 +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
Rui Ueyama d5004e1c69 Fix indentation. 
llvm-svn: 247169
 2015-09-09 18:02:23 +00:00
Rui Ueyama 6666f6ad73 ELF2: Reduce nesting by returning early. NFC. 
llvm-svn: 247168
 2015-09-09 17:55:09 +00:00
Rui Ueyama 7da94a58a0 ELF2: Return early. NFC. 
llvm-svn: 247165
 2015-09-09 17:40:51 +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
Michael J. Spencer 8be15899b4 [lld][elf2] Fix hard coded entry address. 
llvm-svn: 247073
 2015-09-08 21:11:25 +00:00
Michael J. Spencer 88f0d63bea [lld][elf2] Fix style. 
llvm-svn: 247064
 2015-09-08 20:36:20 +00:00
Rafael Espindola 740fafe54d Start creating the .dynamic section. 
For now it is always empty.

llvm-svn: 247056
 2015-09-08 19:43:27 +00:00
Rafael Espindola 57b2592ace Don't treat the string table index specially. NFC. 
We assign the string table section an index like every other section, we can
use it from there.

llvm-svn: 247051
 2015-09-08 19:23:30 +00:00
Rafael Espindola b01b57486d Bug fix: Assign output section indexes *after* sorting them. 
llvm-svn: 247037
 2015-09-08 18:08:57 +00:00
Rafael Espindola 5f55387251 Every output section should be added to the OutputSecitons vector. 
Simplify.

llvm-svn: 247032
 2015-09-08 17:39:39 +00:00