We only support assignments inside SECTIONS, but this does not match
the behavior of GNU linker which also allows them outside SECTIONS.
The only restriction on assignments outside SECTIONS is that they
cannot reference . (they have to be absolute expressions).
Differential Revision: https://reviews.llvm.org/D23598
llvm-svn: 279033
The linker will normally set the LMA equal to the VMA.
You can change that by using the AT keyword.
The expression lma that follows the AT keyword specifies
the load address of the section.
Patch implements this keyword.
Differential revision: https://reviews.llvm.org/D19272
llvm-svn: 278911
This add support for HIDDEN command which can be used to define
a symbol that will be hidden and won't be exported.
Differential Revision: https://reviews.llvm.org/D23534
llvm-svn: 278770
Previously we searched output section by name to assign VA. That did not
work in the case when multiple output sections with different constraints were defined in script.
Testcase shows the possible issue scenario, patch fixes the issue.
Differential revision: https://reviews.llvm.org/D23451
llvm-svn: 278561
After latest changes we combine input sections with
different attributes into single output section.
Problem here is that regular output sections does not
support adding mergeable input sections (and vise versa).
Patch just temporarily disables merging for now at
the same way we do for -O0 for example.
This change helps for linking FreeBSD kernel.
Differential revision: https://reviews.llvm.org/D23447
llvm-svn: 278555
After 278461 "Create only one section for a name in LinkerScript."
this loop is excessive.
Patch also reorders code slightly to use early return.
Differential revision: https://reviews.llvm.org/D23442
llvm-svn: 278554
We found that GNU assembler 2.17.50 [FreeBSD] 2007-07-03
could generate broken objects. STT_SECTION symbols can be
associated with SHT_REL[A]/SHT_SYMTAB/SHT_STRTAB sections.
This is PR28868, patch fixes handling of such files.
Differential revision: https://reviews.llvm.org/D23201
llvm-svn: 278550
Previously filtering that was used worked incorrectly.
For example for next script it would just remove both sections completely:
SECTIONS {
. = 0x1000;
.aaa : ONLY_IF_RW { *(.aaa.*) }
. = 0x2000;
.aaa : ONLY_IF_RO { *(.aaa.*) }
}
Patch fixes above issues and adds testcase showing the issue. Testcase is a subset of
FreeBSD script which has:
.eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) }
...
.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) }
Differential revision: https://reviews.llvm.org/D23326
llvm-svn: 278486
This section supersedes .reginfo and .MIPS.options sections. But for now
we have to support all three sections for ABI transition period.
llvm-svn: 278482
Previously, we were setting LayoutInputSection's OutputSection member
in createSections. Because when we create LayoutInputSectinos, we
don't know the output section for them, so we backfilled the member
in the function. This patch moves the code to backfill it to assignOffsets.
llvm-svn: 278464
Previously, we created two or more output sections if there are
input sections with the same name but with different attributes.
That is a wrong behavior. This patch fixes the issue.
One thing we need to do is to merge output section attributes.
Currently, we create an output section based on the first input
section's attributes. This may make a wrong output section
attributes. What we need to do is to bitwise-OR attributes.
We'll do it in a follow-up patch.
llvm-svn: 278461
One reason why we are (ab)using OutputSectionFactory class is
because it owns output sections. Technically there's no need
to have it own sections. So, this patch transfers the ownership
to Out<ELFT>.
llvm-svn: 278452
The reason why we had to assign offsets only to sections that
don't contain layout sections were unclear. It turned out that
we can live without it.
llvm-svn: 278449
MIPS ISA encoded using two ELF flags: general architecture flag like
EF_MIPS_ARCH_32, EF_MIPS_ARCH_64R6 etc and optional machine variant flag
like EF_MIPS_MACH_4111, EF_MIPS_MACH_OCTEON3 etc. When we check
compatibility between two input files and deduce ELF flags for generated
output we need to take into account both of these flags.
llvm-svn: 278230
SIZEOF_HEADERS - Return the size in bytes of the output file’s headers.
It is is a feature used in FreeBsd script, for example.
There is a discussion on PR28688 page about it.
Differential revision: https://reviews.llvm.org/D23165
llvm-svn: 278204
Simon Atanasyan