It is a bit more convinent and helps to simplify logic
of program headers allocation a little.
Differential revision: https://reviews.llvm.org/D34956
llvm-svn: 312711
Previously LLD did not calculate LMAOffset correctly when
AT and MEMORY were used together.
Patch fixes PR34407.
Differential revision: https://reviews.llvm.org/D37469
llvm-svn: 312625
linker script SECTION rules. This patch extends it to use a fully specified
file name as it appears in --trace output to match agains, i.e,
"<path>/<objname>.o" or "<path>/<libname>.a(<objname>.o)".
Differential Revision: https://reviews.llvm.org/D37031
llvm-svn: 311713
Currently, LLD checks whether there's enough space for headers by
checking if headers fit below the address of the first allocated
section. However, that's always thue if the binary doesn't start
at zero which means that LLD always emits a segment for headers,
even if no other sections belong to that segment.
This is a problem in cases when linker script is being used with a
non-zero start address when we don't want to make the headers visible
by not leaving enough space for them. This pattern is common in
embedded programming but doesn't work in LLD.
This patch changes the behavior of LLD in case when linker script
is being to match the behavior of BFD ld and gold, which is to only
place headers into a segment when they're covered by some output
section.
Differential Revision: https://reviews.llvm.org/D36256
llvm-svn: 311586
Previously we would crash on samples from testcase,
because were trying to access zero pointer to output section.
Differential revision: https://reviews.llvm.org/D36145
llvm-svn: 311311
We would previously crash on next script:
MEMORY { name : ORIGIN = .; }
Patch fixes that.
Differential revision: https://reviews.llvm.org/D36138
llvm-svn: 311073
With this Symbol has the same size as before, but DefinedRegular goes
from 72 to 64 bytes.
I also find this a bit easier to read. There are fewer places
initializing File for example.
This has a small but measurable speed improvement on all tests (1%
max).
llvm-svn: 310142
This is PR33889,
Patch adds support of combination of linkerscript and
-symbol-ordering-file option.
If no sorting commands are present in script inside section declaration
and no --sort-section option specified, code uses sorting from ordering
file if any exist.
Differential revision: https://reviews.llvm.org/D35843
llvm-svn: 310045
This is a bit of a hack, but it is *so* convenient.
Now that we create synthetic linker scripts when none is provided, we
always have to handle paired OutputSection and OutputsectionCommand and
keep a mapping from one to the other.
This patch simplifies things by merging them and creating what used to
be OutputSectionCommands really early.
llvm-svn: 309311
That is slightly more convinent as allows to store pointer on
program header entry in a more safe way.
Change was used in 2 patches currently on review.
Differential revision: https://reviews.llvm.org/D35832
llvm-svn: 309253
This is PR33714.
Previously for each input section offset of memory region
was incremented on a size of output section.
That resulted in a wrong error message saying about
overflow. Patch fixes that.
Differential revision: https://reviews.llvm.org/D35803
llvm-svn: 308955
The comment at the top of compareByFilePosition indicates that it relies
on stable_sort to preserve the order of synthetic sections. We were
using sort instead of stable_sort, however, leading to incorrect
synthetic section ordering.
Differential Revision: https://reviews.llvm.org/D35473
llvm-svn: 308207
Functions declared in Strings.h should provide generic string operations
for the linker, but some of them are too specific to some features. This
patch moves them to the location where they are used.
llvm-svn: 307949
Patch removes restriction about moving location counter
backwards outside of output sections declarations.
That may be useful for some apps relying on such scripts,
known example is linux kernel.
Differential revision: https://reviews.llvm.org/D34977
llvm-svn: 307794
r307367 via D34345 split out the temporary address state used within
processCommands() and assignAddresses(). Due to the way that getSymbolValue
is used by the ScriptParser there is no way of giving the current
OutputSection to getSymbolValue() without somehow accessing the created
addressState. The suggestion was that by making a pointer that would go out
of scope we would find out by ASAN/MSAN or a crash if someone had misused
currentAddressState.
Differential Revision: https://reviews.llvm.org/D34345
llvm-svn: 307637
The assignAddresses() function accumulates state in the LinkerScript that
prevents it from being called multiple times. This change moves the state
into a separate structure AddressState that is created at the start of the
function and disposed of at the end.
CurAddressState is used rather than passing a reference to the state as a
parameter to the functions used by assignAddresses(). This is because the
getSymbolValue function needs to be executed in the context of AddressState
but it is stored in ScriptParser when AddressState is not available.
The AddressState is also used in a limited context by processCommands()
Differential Revision: https://reviews.llvm.org/D34345
llvm-svn: 307367
The allocateHeaders() function is called at the end of assignAddresses(), it
decides whether the ELF header and program header table can be allocated to
a PT_LOAD program header. As the function alters state, it prevents
assignAddresses() from being called multiple times.
This change splits out the call to allocateHeaders() from assignAddresses()
this will permit assignAddresses() to be called while processing range
extension thunks without trying to allocateHeaders().
Differential Revision: https://reviews.llvm.org/D34344
llvm-svn: 307131
This patch makes changes to allow sections without the SHF_ALLOC bit to be
assigned to segments in a linker script.
The assignment of output sections to segments is performed in
LinkerScript::createPhdrs. Previously, this function would bail as soon as it
encountered an output section which did not have the SHF_ALLOC bit set, thus
preventing any output section without SHF_ALLOC from being assigned to a
segment.
This restriction has now been removed from LinkerScript::createPhdrs and instead
a check for SHF_ALLOC has been added to LinkerScript::adjustSectionsAfterSorting
to not propagate program headers to sections without SHF_ALLOC which matches the
behaviour of bfd linker scripts.
Differential Revision: https://reviews.llvm.org/D34204
llvm-svn: 307013
I found this while trying to build u-boot. It uses -Ttext in
combination with linker scripts.
My first reaction was to change the linker scripts to have the correct
value, but I found that it is actually quite convenient to have -Ttext
take precedence.
By having just
.text : { *(.text) }
In the script, they can define the text address in a single Makefile
and pass it to ld with -Ttext and for the C code with
-DFoo=value. Doing the same with linker scripts would require them to
be generated during the build.
llvm-svn: 305766
This patch adds support for segment NONE in linker scripts which enables the
specification that a section should not be assigned to any segment.
Note that GNU ld does not disallow the definition of a segment named NONE, which
if defined, effectively overrides the behaviour described above. This feature
has been copied.
Differential Revision: https://reviews.llvm.org/D34203
llvm-svn: 305700
This is probably the main patch left in unifying our intermediary
representation.
It moves the creation of default commands before section sorting. This
has the nice effect that we now have one location where we decide
where an orphan section should be placed.
Before this patch sortSections would decide the relative location of
orphan sections to other sections, but it was up to placeOrphanSection
to decide on the exact location.
We now only sort sections we created since the linker script is
already in the correct order.
llvm-svn: 305512
Currently we do layout as if non alloc sections had an actual address
and then set it to zero. This produces a few odd results where a
symbol has an address that is inconsistent with the section address.
The simplest way to fix it is probably to just set the address earlier.
The behavior of bfd seems to be similar, but it only sets the non
alloc section address is missing from the linker script or if the
script has an explicit " : 0" setting the address of the output
section (which the default script does).
llvm-svn: 305323
Thunks are now generated per InputSectionDescription instead of per
OutputSection. This allows created ThunkSections to be inserted directly
into InputSectionDescription.
Changes in this patch:
- Loop over InputSectionDescriptions to find relocations to Thunks
- Generate a ThunkSection per InputSectionDescription
- Remove synchronize() as we no longer need it
- Move fabricateDefaultCommands() before createThunks
Differential Revision: https://reviews.llvm.org/D33835
llvm-svn: 304887
When linking linux kernel LLD currently reports next errors:
ld: error: unable to evaluate expression: input section .head.text has no output section assigned
ld: error: At least one side of the expression must be absolute
ld: error: At least one side of the expression must be absolute
That does not provide file/line information and overall looks unclear.
Patch adds location information to ExprValue and that allows
to provide more clear error messages.
Differential revision: https://reviews.llvm.org/D33943
llvm-svn: 304881
George Rimar