mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-31 23:23:43 +01:00
8d5b1aeeff
Add support for the 32bit SuperH architecture running Linux. Specifically, support is added for SH4, and support for earlier SH versions and to the 64bit SH5 are left out. This was tested in qemu with a little-endian SH4 debian image & GCC 4.7 cross compiler.
213 lines
6.7 KiB
Text
213 lines
6.7 KiB
Text
-*- mode: Outline -*-
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This is version 1.0 of the unwind library. This library supports
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several architecture/operating-system combinations:
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Linux/x86-64: Works well.
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Linux/x86: Works well.
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Linux/ARM: Works well.
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Linux/IA-64: Fully tested and supported.
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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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Linux/SuperH: Newly added.
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FreeBSD/i386: Newly added.
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FreeBSD/x86-64: Newly added (FreeBSD architecture is known as amd64).
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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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* Building on FreeBSD
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General building instructions apply. To build and execute several tests,
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you need libexecinfo library available in ports as devel/libexecinfo.
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Development of the port was done of FreeBSD 8.0-STABLE. The library
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was build with the system compiler that is modified version of gcc 4.2.1,
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as well as the gcc 4.4.3.
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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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