Commit Graph

8 Commits

Author SHA1 Message Date
Rafael Espindola 61362ce876 Handle 0 sized sections like any other section.
This is a case where there is inconsistency among ELF linkers:

* The spec says nothing special about empty sections.
* BFD ld removes them.
* Gold handles them like regular sections.

We were outputting them but sometimes ignoring them. This would create
odd looking outputs where a rw section could be in a ro segment for example.

The bfd way of doing things is also strange for the case where a symbol
points to the empty section.

Now we match gold and what seems to be the intention of the spec.

llvm-svn: 251988
2015-11-03 22:08:08 +00:00
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 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
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