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https://github.com/tobast/libunwind-eh_elf.git
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201 lines
6.3 KiB
Text
201 lines
6.3 KiB
Text
-*- mode: Outline -*-
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This is version 0.99 of the unwind library. This library supports
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several architecture/operating-system combinations:
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Linux/IA-64: Fully tested and supported.
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Linux/x86-64: Works well.
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Linux/x86: Works well, but C library is missing some unwind-info.
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Linux/PARISC: Works well, but C library missing unwind-info.
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HP-UX/IA-64: Mostly works but known to have some serious limitations.
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Linux/PPC64: Newly added.
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* General Build Instructions
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In general, this library can be built and installed with the following
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commands:
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$ autoreconf -i # Needed only for building from git. Depends on libtool.
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$ ./configure
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$ make
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$ make install prefix=PREFIX
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where PREFIX is the installation prefix. By default, a prefix of
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/usr/local is used, such that libunwind.a is installed in
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/usr/local/lib and unwind.h is installed in /usr/local/include. For
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testing, you may want to use a prefix of /usr/local instead.
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* Building with Intel compiler
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** Version 8 and later
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Starting with version 8, the preferred name for the IA-64 Intel
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compiler is "icc" (same name as on x86). Thus, the configure-line
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should look like this:
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$ ./configure CC=icc CFLAGS="-g -O3 -ip" CXX=icc CCAS=gcc CCASFLAGS=-g \
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LDFLAGS="-L$PWD/src/.libs"
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* Building on HP-UX
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For the time being, libunwind must be built with GCC on HP-UX.
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libunwind should be configured and installed on HP-UX like this:
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$ ./configure CFLAGS="-g -O2 -mlp64" CXXFLAGS="-g -O2 -mlp64"
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Caveat: Unwinding of 32-bit (ILP32) binaries is not supported
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at the moment.
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** Workaround for older versions of GCC
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GCC v3.0 and GCC v3.2 ship with a bad version of sys/types.h. The
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workaround is to issue the following commands before running
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"configure":
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$ mkdir $top_dir/include/sys
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$ cp /usr/include/sys/types.h $top_dir/include/sys
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GCC v3.3.2 or later have been fixed and do not require this
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workaround.
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* Building for PowerPC64 / Linux
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For building for power64 you should use:
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$ ./configure CFLAGS="-g -O2 -m64" CXXFLAGS="-g -O2 -m64"
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If your power support altivec registers:
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$ ./configure CFLAGS="-g -O2 -m64 -maltivec" CXXFLAGS="-g -O2 -m64 -maltivec"
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To check if your processor has support for vector registers (altivec):
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cat /proc/cpuinfo | grep altivec
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and should have something like this:
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cpu : PPC970, altivec supported
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If libunwind seems to not work (backtracing failing), try to compile
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it with -O0, without optimizations. There are some compiler problems
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depending on the version of your gcc.
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* Regression Testing
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After building the library, you can run a set of regression tests with:
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$ make check
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** Expected results on IA-64 Linux
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Unless you have a very recent C library and compiler installed, it is
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currently expected to have the following tests fail on IA-64 Linux:
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Gtest-init (should pass starting with glibc-2.3.x/gcc-3.4)
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Ltest-init (should pass starting with glibc-2.3.x/gcc-3.4)
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test-ptrace (should pass starting with glibc-2.3.x/gcc-3.4)
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run-ia64-test-dyn1 (should pass starting with glibc-2.3.x)
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This does not mean that libunwind cannot be used with older compilers
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or C libraries, it just means that for certain corner cases, unwinding
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will fail. Since they're corner cases, it is not likely for
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applications to trigger them.
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Note: If you get lots of errors in Gia64-test-nat and Lia64-test-nat, it's
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almost certainly a sign of an old assembler. The GNU assembler used
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to encode previous-stack-pointer-relative offsets incorrectly.
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This bug was fixed on 21-Sep-2004 so any later assembler will be
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fine.
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** Expected results on x86 Linux
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The following tests are expected to fail on x86 Linux:
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Gtest-resume-sig (fails to get SIGUSR2)
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Ltest-resume-sig (likewise)
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Gtest-dyn1 (no dynamic unwind info support yet)
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Ltest-dyn1 (no dynamic unwind info support yet)
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test-setjmp (longjmp() not implemented yet)
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run-check-namespace (no _Ux86_getcontext yet)
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test-ptrace
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** Expected results on x86-64 Linux
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The following tests are expected to fail on x86-64 Linux:
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Gtest-dyn1 (no dynamic unwind info support yet)
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Ltest-dyn1 (no dynamic unwind info support yet)
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Gtest-init (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18743)
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Ltest-init (likewise)
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test-async-sig (crashes due to bad unwind-info?)
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test-setjmp (longjmp() not implemented yet)
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run-check-namespace (no _Ux86_64_getcontext yet)
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run-ptrace-mapper (??? investigate)
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run-ptrace-misc (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18748
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and http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18749)
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** Expected results on PARISC Linux
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Caveat: GCC v3.4 or newer is needed on PA-RISC Linux. Earlier
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versions of the compiler failed to generate the exception-handling
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program header (GNU_EH_FRAME) needed for unwinding.
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The following tests are expected to fail on x86-64 Linux:
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Gtest-bt (backtrace truncated at kill() due to lack of unwind-info)
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Ltest-bt (likewise)
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Gtest-resume-sig (Gresume.c:my_rt_sigreturn() is wrong somehow)
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Ltest-resume-sig (likewise)
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Gtest-init (likewise)
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Ltest-init (likewise)
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Gtest-dyn1 (no dynamic unwind info support yet)
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Ltest-dyn1 (no dynamic unwind info support yet)
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test-setjmp (longjmp() not implemented yet)
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run-check-namespace (toolchain doesn't support HIDDEN yet)
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** Expected results on HP-UX
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"make check" is currently unsupported for HP-UX. You can try to run
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it, but most tests will fail (and some may fail to terminate). The
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only test programs that are known to work at this time are:
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tests/bt
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tests/Gperf-simple
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tests/test-proc-info
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tests/test-static-link
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tests/Gtest-init
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tests/Ltest-init
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tests/Gtest-resume-sig
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tests/Ltest-resume-sig
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** Expected results on PPC64 Linux
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"make check" should run with no more than 10 out of 24 tests failed.
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* Performance Testing
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This distribution includes a few simple performance tests which give
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some idea of the basic cost of various libunwind operations. After
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building the library, you can run these tests with the following
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commands:
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$ cd tests
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$ make perf
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* Contacting the Developers
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Please direct all questions regarding this library to:
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libunwind-devel@nongnu.org
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You can do this by sending a mail to libunwind-request@nongnu.org with
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a body of:
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subscribe libunwind-devel
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or you can subscribe and manage your subscription via the
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web-interface at:
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https://savannah.nongnu.org/mail/?group=libunwind
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