Commit Graph

31 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 69960baad5 ELF2: Write .interp section on the first page in the exectuable.
Previously, we reserved the first page for the program header, so no
sections would be written to very beginning of the output file.
FreeBSD requires .interp section be exist on the first page, so that
was not good.

This patch calculates the size of the program header and then assign
addresses to the sections. Now the first section is located next to
the program header. Because the first section is .interp, it's very
likely to be on the first page.

llvm-svn: 249957
2015-10-10 23:25:39 +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
Rui Ueyama 2dfd74f758 ELF2: Add DT_REL{,A}ENT and DT_SYMENT.
According to the ELF specification, these dynamic array entries are mandatory.

http://reviews.llvm.org/D13303

llvm-svn: 248952
2015-09-30 21:57:53 +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 8e5560d894 Don't complain about symbols showing up in multible shared libraries.
llvm-svn: 248381
2015-09-23 14:23:59 +00:00
Rafael Espindola 1ab429bf49 Fix a last minuted edit that should not have been committed.
Sorry about that.

llvm-svn: 248349
2015-09-22 23:42:55 +00:00
Rafael Espindola 05a3dd2cba Implement --export-dynamic.
llvm-svn: 248347
2015-09-22 23:38:23 +00:00
Rafael Espindola 50534c2b6f Fix the creation of Elf_Rel sections.
We were always incrementing the output buffer pointer by sizeof(Elf_Rela).

llvm-svn: 248303
2015-09-22 17:49:38 +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 67a5da60ed Add support of Elf_Rel dynamic relocations.
llvm-svn: 247888
2015-09-17 14:02:10 +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
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 2e9eac13c7 Implement -rpath.
llvm-svn: 247475
2015-09-11 21:18:56 +00:00
Rafael Espindola 7174dcfb0f Don't make assumptions about the size of the dynamic string table.
It contains pathnames, so it can be different in each machine.

llvm-svn: 247453
2015-09-11 19:12:37 +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 5723fcd015 Make this test a bit more resistant to section number changes.
llvm-svn: 247439
2015-09-11 17:53:01 +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 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
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
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 18173d420e Start adding support for symbols in shared libraries.
llvm-svn: 247019
2015-09-08 15:50:05 +00:00