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23 Commits

Author SHA1 Message Date
George Rimar 0f5ac9f571 [ELF2] .shstrtab section implemented 
The section header table index of the entry that is associated with the section name string table.

Differential Revision: http://reviews.llvm.org/D13904

llvm-svn: 250836
 2015-10-20 17:21:35 +00:00
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
Rui Ueyama 60fe7fcc6b ELF2: Use ld.lld2 instead of lld -flavor gnu2. 
llvm-svn: 249573
 2015-10-07 17:31:39 +00:00
Michael J. Spencer 52bf0ebfdf [lld][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: 249071
 2015-10-01 21:15:02 +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 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
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
Michael J. Spencer 546c64c733 [lld][elf2] Fix hard coded entry address. 
llvm-svn: 247089
 2015-09-08 22:34:57 +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
Rafael Espindola 62b81b875a Start populating the symbol table. 
With this patch only the name is set. I will set the other fields shortly.

For now the table doesn't include local symbols. This is equivalent to using
--discard-all with gnu ld. This is OK for now since the symbols are not
needed for execution and for testing symbol resolution we only need the
global symbols.

llvm-svn: 245044
 2015-08-14 13:07:05 +00:00
Rafael Espindola f763ca3c9c ELF: Create a symbol table. 
For now it is empty. I will add the symbols in a followup patch.

llvm-svn: 245008
 2015-08-14 02:42:20 +00:00
Rafael Espindola 2db634d8f1 Correctly align output sections. 
They don't need to be aligned to page boundaries. Only segments need that.

llvm-svn: 244942
 2015-08-13 20:24:18 +00:00
Rafael Espindola 0160a281c2 Record the alignment of the output sections. 
llvm-svn: 244941
 2015-08-13 20:13:39 +00:00
Rafael Espindola 64e888ba5f Set the file offset of zero sized sections. 
There is no reason not to do it and this matches what gold and bfd ld do.

llvm-svn: 244929
 2015-08-13 18:23:43 +00:00
Rafael Espindola 91009b3856 Fix the alignment of the section headers. 
Thanks a lot to Rui for noticing it.

llvm-svn: 244711
 2015-08-12 01:45:28 +00:00
Rafael Espindola 6b83b90b6a ELF: Create a string table. 
For now only the sections are in it, but it already makes the output easier
to read and test.

llvm-svn: 244702
 2015-08-12 00:00:24 +00:00
Rafael Espindola 4b7c2fc64e Add bare minimum to get a working i386 linux program. 
llvm-svn: 244050
 2015-08-05 15:08:40 +00:00