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| <div class="titlepage"><div><div><h1 class="title"> |
| <a name="dist.readme-solaris"></a>12. README.solaris</h1></div></div></div> |
| <div class="literallayout"><p><br> |
| Requirements<br> |
| ------------<br> |
| - You need a recent Solaris-like OS to compile this port. Solaris 11 or<br> |
| any illumos-based distribution should work, Solaris 10 is not supported.<br> |
| Running `uname -r` has to print '5.11'.<br> |
| - Recent GCC tools are required, GCC 3 will probably not work. GCC version<br> |
| 4.5 (or higher) is recommended.<br> |
| - Solaris ld has to be the first linker in the PATH. GNU ld cannot be used.<br> |
| There is currently no linker check in the configure script but the linking<br> |
| phase fails if GNU ld is used. Recent Solaris/illumos distributions are ok.<br> |
| - A working combination of autotools is required: aclocal, autoheader,<br> |
| automake and autoconf have to be found in the PATH. You should be able to<br> |
| install pkg:/developer/build/automake and pkg:/developer/build/autoconf<br> |
| packages to fulfil this requirement.<br> |
| - System header files are required. On Solaris, these can be installed with:<br> |
| # pkg install system/header<br> |
| - GNU make is also required. On Solaris, this can be quickly achieved with:<br> |
| $ PATH=/usr/gnu/bin:$PATH; export PATH<br> |
| - For remote debugging support, working GDB is required (see below).<br> |
| - For running regression tests, GNU sed, grep, awk, diff are required.<br> |
| This can be quickly achieved on Solaris by prepending /usr/gnu/bin to PATH.<br> |
| <br> |
| <br> |
| Compilation<br> |
| -----------<br> |
| Please follow the generic instructions in the README file.<br> |
| <br> |
| The configure script detects a canonical host to determine which version of<br> |
| Valgrind should be built. If the system compiler by default produces 32-bit<br> |
| binaries then only a 32-bit version of Valgrind will be built. To enable<br> |
| compilation of both 64-bit and 32-bit versions on such a system, issue the<br> |
| configure script as follows:<br> |
| ./configure CC='gcc -m64' CXX='g++ -m64'<br> |
| <br> |
| <br> |
| Oracle Solaris and illumos support<br> |
| ----------------------------------<br> |
| One of the main goal of this port is to support both Oracle Solaris and<br> |
| illumos kernels. This is a very hard task because Solaris kernel traditionally<br> |
| does not provide a stable syscall interface and because Valgrind contains<br> |
| several parts that are closely tied to the underlying kernel. For these<br> |
| reasons, the port needs to detect which syscall interfaces are present. This<br> |
| detection cannot be done easily at run time and is currently implemented as<br> |
| a set of configure tests. This means that a binary version of this port can be<br> |
| executed only on a kernel that is compatible with a kernel that was used<br> |
| during the configure and compilation time.<br> |
| <br> |
| Main currently-known incompatibilities:<br> |
| - Solaris 11 (released in November 2011) removed a large set of syscalls where<br> |
| *at variant of the syscall was also present, for example, open() versus<br> |
| openat(AT_FDCWD) [1]<br> |
| - syscall number for unlinkat() is 76 on Solaris 11, but 65 on illumos [2]<br> |
| - illumos (in April 2013) changed interface of the accept() and pipe()<br> |
| syscalls [3]<br> |
| - posix_spawn() functionality is backed up by true spawn() syscall on Solaris 12<br> |
| whereas illumos and Solaris 11 leverage vfork()<br> |
| - illumos and older Solaris use utimesys() syscall whereas newer Solaris<br> |
| uses utimensat()<br> |
| <br> |
| [1] http://docs.oracle.com/cd/E26502_01/html/E28556/gkzlf.html#gkzip<br> |
| [2] https://www.illumos.org/issues/521<br> |
| [3] https://github.com/illumos/illumos-gate/commit/5dbfd19ad5fcc2b779f40f80fa05c1bd28fd0b4e<br> |
| <br> |
| <br> |
| Limitations<br> |
| -----------<br> |
| - The port is Work-In-Progress, many things may not work or they can be subtly<br> |
| broken.<br> |
| - Coredumps produced by Valgrind do not contain all information available,<br> |
| especially microstate accounting and processor bindings.<br> |
| - Accessing contents of /proc/self/psinfo is not thread-safe. That is because<br> |
| Valgrind emulates this file on behalf of the client programs. Entire<br> |
| open() - read() - close() sequence on this file needs to be performed<br> |
| atomically.<br> |
| - Fork limitations: vfork() is translated to fork(), forkall() is not<br> |
| supported.<br> |
| - Valgrind does not track definedness of some eflags (OF, SF, ZF, AF, CF, PF)<br> |
| individually for each flag. After a syscall is finished, when a carry flag<br> |
| is set and defined, all other mentioned flags will be also defined even<br> |
| though they might be undefined before making the syscall.<br> |
| - System call "execve" with a file descriptor which points to a hardlink<br> |
| is currently not supported. That is because from the opened file descriptor<br> |
| itself it is not possible to reverse map the intended pathname.<br> |
| Examples are fexecve(3C) and isaexec(3C).<br> |
| - Program headers PT_SUNW_SYSSTAT and PT_SUNW_SYSSTAT_ZONE are not supported.<br> |
| That is, programs linked with mapfile directive RESERVE_SEGMENT and attribute<br> |
| TYPE equal to SYSSTAT or SYSSTAT_ZONE will cause Valgrind exit. It is not<br> |
| possible for Valgrind to arrange mapping of a kernel shared page at the<br> |
| address specified in the mapfile for the guest application. There is currently<br> |
| no such mechanism in Solaris. Hacky workarounds are possible, though.<br> |
| - When a thread has no stack then all system calls will result in Valgrind<br> |
| crash, even though such system calls use just parameters passed in registers.<br> |
| This should happen only in pathological situations when a thread is created<br> |
| with custom mmap'ed stack and this stack is then unmap'ed during thread<br> |
| execution.<br> |
| <br> |
| <br> |
| Remote debugging support<br> |
| ------------------------<br> |
| Solaris port of GDB has a major flaw which prevents remote debugging from<br> |
| working correctly. Fortunately this flaw has an easy fix [4]. Unfortunately<br> |
| it is not present in the current GDB 7.6.2. This boils down to several<br> |
| options:<br> |
| - Use GDB shipped with Solaris 11.2 which has this flaw fixed.<br> |
| - Wait until GDB 7.7 becomes available (there won't be other 7.6.x releases).<br> |
| - Build GDB 7.6.2 with the fix by yourself using the following steps:<br> |
| # pkg install developer/gnu-binutils<br> |
| $ wget http://ftp.gnu.org/gnu/gdb/gdb-7.6.2.tar.gz<br> |
| $ gzip -dc gdb-7.6.2.tar.gz | tar xf -<br> |
| $ cd gdb-7.6.2<br> |
| $ patch -p1 -i /path/to/valgrind-solaris/solaris/gdb-sol-thread.patch<br> |
| $ export LIBS="-lncurses"<br> |
| $ export CC="gcc -m64"<br> |
| $ ./configure --with-x=no --with-curses --with-libexpat-prefix=/usr/lib<br> |
| $ gmake && gmake install<br> |
| <br> |
| [4] https://sourceware.org/ml/gdb-patches/2013-12/msg00573.html<br> |
| <br> |
| <br> |
| TODO list<br> |
| ---------<br> |
| - Fix few remaining failing tests.<br> |
| - Add more Solaris-specific tests (especially for the door and spawn<br> |
| syscalls).<br> |
| - Provide better error reporting for various subsyscalls.<br> |
| - Implement storing of extra register state in signal frame.<br> |
| - Performance comparison against other platforms.<br> |
| - Prevent SIGPIPE when writing to a socket (coregrind/m_libcfile.c).<br> |
| - Implement ticket locking for fair scheduling (--fair-sched=yes).<br> |
| - Implement support in DRD and Helgrind tools for thr_join() with thread == 0.<br> |
| - Add support for accessing thread-local variables via gdb (auxprogs/getoff.c).<br> |
| Requires research on internal libc TLS representation.<br> |
| - VEX supports AVX, BMI and AVX2. Investigate if they can be enabled on<br> |
| Solaris/illumos.<br> |
| - Investigate support for more flags in AT_SUN_AUXFLAGS.<br> |
| - Fix Valgrind crash when a thread has no stack and syswrap-main.c accesses<br> |
| all possible syscall parameters. Enable helgrind/tests/stackteardown.c<br> |
| to see this in effect. Would require awareness of syscall parameter semantics.<br> |
| - Correctly print arguments of DW_CFA_ORCL_arg_loc in show_CF_instruction() when<br> |
| it is implemented in libdwarf.<br> |
| - Handle a situation when guest program sets SC_CANCEL_FLG in schedctl and<br> |
| Valgrind needs to invoke a syscall on its own.<br> |
| <br> |
| <br> |
| Contacts<br> |
| --------<br> |
| Please send bug reports and any questions about the port to:<br> |
| Ivo Raisr <ivosh@ivosh.net><br> |
| Petr Pavlu <setup@dagobah.cz><br> |
| <br> |
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