While porting libunwind over to CloudABI for ARMv6, I observed that this
source file doesn't build, as it depends on dl_unwind_find_exidx(),
which CloudABI's C library was lacking. After I added that function, I
still needed to patch up libunwind to define _Unwind_Ptr.
Taking a step back, I wonder why we need to make use of this function
anyway. The unwinder already has some nice code to use dl_iterate_phdr()
to scan for a PT_GNU_EH_FRAME header. The dl_unwind_find_exidx() does
the same thing, except matching PT_ARM_EXIDX instead. We could also do
that ourselves.
This change gets rid of the dl_unwind_find_exidx() call and extends the
dl_iterate_phdr() loop. This approach has the advantage of getting rid
of some of those OS-specific #ifdefs. This now means that if an
operating system only provides dl_iterate_phdr(), it gets support for
unwinding on all architectures. There is no need to add more stuff, just
to get ARMv6 support.
This change is identical to r295944, except that it now adds the
necessary code to do bounds checking on PT_LOAD. The previous version of
this change lacked this, which didn't cause any problems on CloudABI,
but did break the Linux build bots. This is why I reverted it in
r295948.
Differential Revision: https://reviews.llvm.org/D30306
llvm-svn: 296991
When libunwind was spinned off libcxxabi, most file were copied from
libcxxabi to libunwind. However, libc++abi's toplevel LICENSE.TXT was
forgotten in the copying. It's considered a good practice to have the
license file at the root of the project, and making linunwind a separate
project was not supposed to change its licensing. Besides, several
header files refer to the LICENSE.TXT, so copy the one from libc++abi.
llvm-svn: 296358
We've been having issues with using libcxxabi and libunwind for baremetal
targets because fprintf is dependent on io functions, this patch disables calls
to fprintf when building for baremetal in release mode.
Differential Revision: https://reviews.llvm.org/D30340
llvm-svn: 296135
Even though the change works perfectly fine on CloudABI, it fails to
work on the libcxx-libcxxabi-libunwind-arm-linux-noexceptions build bot.
Looking at the code, this may be attributed to the fact that the code
doesn't take the PT_LOAD addresses into consideration.
I will rework this change to fix that and send out an updated version
for review in the nearby future.
llvm-svn: 295948
While porting libunwind over to CloudABI for ARMv6, I observed that this
source file doesn't build, as it depends on dl_unwind_find_exidx(),
which CloudABI's C library was lacking. After I added that function,
I still needed to patch up libunwind to define _Unwind_Ptr.
Taking a step back, I wonder why we need to make use of this function
anyway. The unwinder already has some nice code to use dl_iterate_phdr()
to scan for a PT_GNU_EH_FRAME header. The dl_unwind_find_exidx() does
the same thing, except matching PT_ARM_EXIDX instead. We could also do
that ourselves.
This change gets rid of the dl_unwind_find_exidx() call and extends the
dl_iterate_phdr() loop. In addition to making the code a bit shorter, it
has the advantage of getting rid of some of those OS-specific #ifdefs.
This now means that if an operating system only provides
dl_iterate_phdr(), it gets support for unwinding on all architectures.
There is no need to add more stuff, just to get ARMv6 support.
Differential Revision: https://reviews.llvm.org/D28082
llvm-svn: 295944
libunwind depends on C++ library headers. When building libunwind
as part of LLVM and libc++ is available, use its headers.
Differential Revision: https://reviews.llvm.org/D29997
llvm-svn: 295285
This causing build failure on sanitizer bots because of the unused
argument '-nostdinc++' during linking of libunwind.
This reverts commit 0e14fd1a1d37b9c6d55a2d3bc7649e5b39ce74d3.
llvm-svn: 295202
libunwind depends on C++ library headers. When building libunwind
as part of LLVM and libc++ is available, use its headers.
Differential Revision: https://reviews.llvm.org/D29800
llvm-svn: 295153
libunwind depends on C++ library headers. When building libunwind
as part of LLVM and libc++ is available, use its headers.
Differential Revision: https://reviews.llvm.org/D29573
llvm-svn: 294554
This reverts SVN r292721. Avoid the use of the GNU extension as the
preprocessor in C++11 mode requires at least one argument, and this
warning cannot be disabled, resulting in failing -Werror builds.
llvm-svn: 293257
Restore the `libunwind.h` enumeration values back to the inverted
values. This diverges from the DWARF definition of the register values.
However, this allows our header to be compatible with other unwind
implementations (e.g. HP, GNU Savannah, GCC).
The register IDs are only swapped in the header and need to be unswapped
when accessing the unwind register file. The flipped EBP and ESP only
applies on non-Apple x86 targets.
When optimizations were enabled, EBP and ESP would no longer be
equivalent. As a result, the incorrect access on Linux would manifest
as a failure to unwind the stack. We can now unwind the stack with and
without FPO on Linux x86.
Resolves PR30879!
llvm-svn: 292723
Unify the definition of `_LIBUNWIND_LOG_NON_ZERO` to make it clear what
it is defined to and make the definition unconditional. Reorder the
debug and tracing macros to be defined in the same order. NFC.
llvm-svn: 292720
This patch adjusts the out-of-tree CMake configuration so that
the stderr output is ignored when an old llvm-config is found
that doesn't support --cmakedir.
llvm-svn: 291992
Use the new --cmakedir option to obtain LLVM_CMAKE_PATH straight from
llvm-config. Fallback to local reconstruction if llvm-config does not
support this option.
llvm-svn: 291505
These are part of the EHABI specification and are exported to be available to
users. Mark them as `_LIBUNWIND_EXPORT` like the rest of the unwind interfaces.
llvm-svn: 287283
The new LLVM runtimes directory requires the same conventions to be
followed across the runtime projects. These changes make libunwind
build under the runtimes subdirectory.
This patch contains the following changes:
* Rename LLVM_CONFIG to LLVM_CONFIG_PATH
* Check if compiler supports C++11 (required by libunwind)
Differential Revision: https://reviews.llvm.org/D26360
llvm-svn: 286308
This missing include seems to cause compilation failures on older MacOS
versions (< 10.9). This is because r270692 has introduced uint64_t into
config.h without including this header.
Patch from: Jeremy Huddleston Sequoia (jeremyhu@apple.com)
llvm-svn: 284125
The EHABI unwinder is thread-agnostic, SJLJ unwinder and the DWARF unwinder have
a couple of pthread dependencies.
This patch makes it possible to build the whole of libunwind for a
single-threaded environment.
Reviewers: compnerd
Differential revision: https://reviews.llvm.org/D24984
llvm-svn: 282575
Summary:
During building of recent compiler-rt sources on FreeBSD for arm, I
noticed that our unwind.h (which originates in libunwind) was missing
the `_US_ACTION_MASK` constant:
compiler-rt/lib/builtins/gcc_personality_v0.c:187:18: error: use of undeclared identifier '_US_ACTION_MASK'
if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING)
^
It appears that both clang's internal unwind.h, and libgcc's unwind.h
define this constant as 3, so let's add this to libunwind's version too.
Reviewers: logan, kledzik, davide, emaste
Subscribers: joerg, davide, aemerson, emaste, llvm-commits
Differential Revision: https://reviews.llvm.org/D24222
llvm-svn: 280669
Previously most messages included a newline in the string, but a few of
them were missing. Fix these and simplify by just adding the newline in
the _LIBUNWIND_LOG macro itself.
Differential Revision: https://reviews.llvm.org/D24026
llvm-svn: 280103
For historical reasons i386 has ebp and esp swapped in the eh_frame
register numbering on at least Darwin. That is:
Darwin FreeBSD
Reg # eh_frame eh_frame DWARF
===== ======== ======== =====
4 ebp esp esp
5 esp ebp ebp
Although the UNW_X86_* constants are not intended to be coupled with
DWARF / eh_frame numbering they are currently conflated in libunwind.
Differential Revision: https://reviews.llvm.org/D22508
llvm-svn: 280099
When the unwinder is built without WMMX support, if we encounter a WMMX register
virtual operation, early rather than attempting to continue as we would not have
saved the register set anyways. This should never come down this path, but,
just in case, help it abort more explicitly.
llvm-svn: 279941
Some unwind code is purposedly old enough to work on previous architecutres
and they're guaranteed to never trigger in newer architectures, so we need
to add .arch directives to tell the compiler/assembler that it's fine and we
know what we're doing.
Fixes PR29149.
llvm-svn: 279871
When making WMMX support optional, we uncovered the switch. Add the missing
entries. Since the entry is a break leading to a dead path, it should get
optimized out yet retain the switch overage.
llvm-svn: 279180
This change allows building both shared and static version of libunwind
in a single build, sharing object files between both versions.
Differential Revision: https://reviews.llvm.org/D23233
llvm-svn: 278067
The Thumb1 version of the code for saving and restoring the unwind
context has a few bugs which prevent it from working:
* It uses the STM instruction without writeback, which is not valid for Thumb1
(It was introduced in Thumb2).
* It only saves/restores the low 8 registers, the sp and the lr, so if a
program uses r8-r12 they will not be correctly restored when throwing an
exception.
There aren't currently any Thumb1 build-bots to test this, but we have
been successfully running the libc++abi and libc++ test suites on
Cortex-M0 models, as well as some other test suites that use C++
exceptions on a downstream version of libunwind with this patch applied.
Differential Revision: https://reviews.llvm.org/D22292
llvm-svn: 276625
Summary: _Unwind_Exception is required to be double word aligned. Currently the struct is under aligned.
Reviewers: mclow.lists, compnerd, kledzik, emaste
Subscribers: emaste, cfe-commits
Differential Revision: https://reviews.llvm.org/D22543
llvm-svn: 276215
NetBSD's system unwinder is a modified version of LLVM's libunwind.
Slightly reduce diffs by updating comments to match theirs where
appropriate.
llvm-svn: 275997
Ed Schouten