diff options
| author | dim <dim@FreeBSD.org> | 2016-12-26 20:36:37 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2016-12-26 20:36:37 +0000 |
| commit | 06210ae42d418d50d8d9365d5c9419308ae9e7ee (patch) | |
| tree | ab60b4cdd6e430dda1f292a46a77ddb744723f31 /contrib/compiler-rt/lib/esan/working_set_posix.cpp | |
| parent | 2dd166267f53df1c3748b4325d294b9b839de74b (diff) | |
| download | FreeBSD-src-06210ae42d418d50d8d9365d5c9419308ae9e7ee.zip FreeBSD-src-06210ae42d418d50d8d9365d5c9419308ae9e7ee.tar.gz | |
MFC r309124:
Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0. Also completely revamp the build system for
clang, llvm, lldb and their related tools.
Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.
Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>
Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.
Relnotes: yes
MFC r309147:
Pull in r282174 from upstream llvm trunk (by Krzysztof Parzyszek):
[PPC] Set SP after loading data from stack frame, if no red zone is
present
Follow-up to r280705: Make sure that the SP is only restored after
all data is loaded from the stack frame, if there is no red zone.
This completes the fix for
https://llvm.org/bugs/show_bug.cgi?id=26519.
Differential Revision: https://reviews.llvm.org/D24466
Reported by: Mark Millard
PR: 214433
MFC r309149:
Pull in r283060 from upstream llvm trunk (by Hal Finkel):
[PowerPC] Refactor soft-float support, and enable PPC64 soft float
This change enables soft-float for PowerPC64, and also makes
soft-float disable all vector instruction sets for both 32-bit and
64-bit modes. This latter part is necessary because the PPC backend
canonicalizes many Altivec vector types to floating-point types, and
so soft-float breaks scalarization support for many operations. Both
for embedded targets and for operating-system kernels desiring
soft-float support, it seems reasonable that disabling hardware
floating-point also disables vector instructions (embedded targets
without hardware floating point support are unlikely to have Altivec,
etc. and operating system kernels desiring not to use floating-point
registers to lower syscall cost are unlikely to want to use vector
registers either). If someone needs this to work, we'll need to
change the fact that we promote many Altivec operations to act on
v4f32. To make it possible to disable Altivec when soft-float is
enabled, hardware floating-point support needs to be expressed as a
positive feature, like the others, and not a negative feature,
because target features cannot have dependencies on the disabling of
some other feature. So +soft-float has now become -hard-float.
Fixes PR26970.
Pull in r283061 from upstream clang trunk (by Hal Finkel):
[PowerPC] Enable soft-float for PPC64, and +soft-float -> -hard-float
Enable soft-float support on PPC64, as the backend now supports it.
Also, the backend now uses -hard-float instead of +soft-float, so set
the target features accordingly.
Fixes PR26970.
Reported by: Mark Millard
PR: 214433
MFC r309212:
Add a few missed clang 3.9.0 files to OptionalObsoleteFiles.
MFC r309262:
Fix packaging for clang, lldb and lld 3.9.0
During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.
Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package
Reviewed by: gjb, jmallett
Differential Revision: https://reviews.freebsd.org/D8666
MFC r309656:
During the bootstrap phase, when building the minimal llvm library on
PowerPC, add lib/Support/Atomic.cpp. This is needed because upstream
llvm revision r271821 disabled the use of std::call_once, which causes
some fallback functions from Atomic.cpp to be used instead.
Reported by: Mark Millard
PR: 214902
MFC r309835:
Tentatively apply https://reviews.llvm.org/D18730 to work around gcc PR
70528 (bogus error: constructor required before non-static data member).
This should fix buildworld with the external gcc package.
Reported by: https://jenkins.freebsd.org/job/FreeBSD_HEAD_amd64_gcc/
MFC r310194:
Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
3.9.1 release.
Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.
Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/3.9.1/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/lld/docs/ReleaseNotes.html>
Relnotes: yes
Diffstat (limited to 'contrib/compiler-rt/lib/esan/working_set_posix.cpp')
| -rw-r--r-- | contrib/compiler-rt/lib/esan/working_set_posix.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/contrib/compiler-rt/lib/esan/working_set_posix.cpp b/contrib/compiler-rt/lib/esan/working_set_posix.cpp new file mode 100644 index 0000000..fcfa871 --- /dev/null +++ b/contrib/compiler-rt/lib/esan/working_set_posix.cpp @@ -0,0 +1,133 @@ +//===-- working_set_posix.cpp -----------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file is a part of EfficiencySanitizer, a family of performance tuners. +// +// POSIX-specific working set tool code. +//===----------------------------------------------------------------------===// + +#include "working_set.h" +#include "esan_flags.h" +#include "esan_shadow.h" +#include "sanitizer_common/sanitizer_common.h" +#include "sanitizer_common/sanitizer_linux.h" +#include <signal.h> +#include <sys/mman.h> + +namespace __esan { + +// We only support regular POSIX threads with a single signal handler +// for the whole process == thread group. +// Thus we only need to store one app signal handler. +// FIXME: Store and use any alternate stack and signal flags set by +// the app. For now we just call the app handler from our handler. +static __sanitizer_sigaction AppSigAct; + +bool processWorkingSetSignal(int SigNum, void (*Handler)(int), + void (**Result)(int)) { + VPrintf(2, "%s: %d\n", __FUNCTION__, SigNum); + if (SigNum == SIGSEGV) { + *Result = AppSigAct.handler; + AppSigAct.sigaction = (void (*)(int, void*, void*))Handler; + return false; // Skip real call. + } + return true; +} + +bool processWorkingSetSigaction(int SigNum, const void *ActVoid, + void *OldActVoid) { + VPrintf(2, "%s: %d\n", __FUNCTION__, SigNum); + if (SigNum == SIGSEGV) { + const struct sigaction *Act = (const struct sigaction *) ActVoid; + struct sigaction *OldAct = (struct sigaction *) OldActVoid; + if (OldAct) + internal_memcpy(OldAct, &AppSigAct, sizeof(OldAct)); + if (Act) + internal_memcpy(&AppSigAct, Act, sizeof(AppSigAct)); + return false; // Skip real call. + } + return true; +} + +bool processWorkingSetSigprocmask(int How, void *Set, void *OldSet) { + VPrintf(2, "%s\n", __FUNCTION__); + // All we need to do is ensure that SIGSEGV is not blocked. + // FIXME: we are not fully transparent as we do not pretend that + // SIGSEGV is still blocked on app queries: that would require + // per-thread mask tracking. + if (Set && (How == SIG_BLOCK || How == SIG_SETMASK)) { + if (internal_sigismember((__sanitizer_sigset_t *)Set, SIGSEGV)) { + VPrintf(1, "%s: removing SIGSEGV from the blocked set\n", __FUNCTION__); + internal_sigdelset((__sanitizer_sigset_t *)Set, SIGSEGV); + } + } + return true; +} + +static void reinstateDefaultHandler(int SigNum) { + __sanitizer_sigaction SigAct; + internal_memset(&SigAct, 0, sizeof(SigAct)); + SigAct.sigaction = (void (*)(int, void*, void*)) SIG_DFL; + int Res = internal_sigaction(SigNum, &SigAct, nullptr); + CHECK(Res == 0); + VPrintf(1, "Unregistered for %d handler\n", SigNum); +} + +// If this is a shadow fault, we handle it here; otherwise, we pass it to the +// app to handle it just as the app would do without our tool in place. +static void handleMemoryFault(int SigNum, void *Info, void *Ctx) { + if (SigNum == SIGSEGV) { + // We rely on si_addr being filled in (thus we do not support old kernels). + siginfo_t *SigInfo = (siginfo_t *)Info; + uptr Addr = (uptr)SigInfo->si_addr; + if (isShadowMem(Addr)) { + VPrintf(3, "Shadow fault @%p\n", Addr); + uptr PageSize = GetPageSizeCached(); + int Res = internal_mprotect((void *)RoundDownTo(Addr, PageSize), + PageSize, PROT_READ|PROT_WRITE); + CHECK(Res == 0); + } else if (AppSigAct.sigaction) { + // FIXME: For simplicity we ignore app options including its signal stack + // (we just use ours) and all the delivery flags. + AppSigAct.sigaction(SigNum, Info, Ctx); + } else { + // Crash instead of spinning with infinite faults. + reinstateDefaultHandler(SigNum); + } + } else + UNREACHABLE("signal not registered"); +} + +void registerMemoryFaultHandler() { + // We do not use an alternate signal stack, as doing so would require + // setting it up for each app thread. + // FIXME: This could result in problems with emulating the app's signal + // handling if the app relies on an alternate stack for SIGSEGV. + + // We require that SIGSEGV is not blocked. We use a sigprocmask + // interceptor to ensure that in the future. Here we ensure it for + // the current thread. We assume there are no other threads at this + // point during initialization, or that at least they do not block + // SIGSEGV. + __sanitizer_sigset_t SigSet; + internal_sigemptyset(&SigSet); + internal_sigprocmask(SIG_BLOCK, &SigSet, nullptr); + + __sanitizer_sigaction SigAct; + internal_memset(&SigAct, 0, sizeof(SigAct)); + SigAct.sigaction = handleMemoryFault; + // We want to handle nested signals b/c we need to handle a + // shadow fault in an app signal handler. + SigAct.sa_flags = SA_SIGINFO | SA_NODEFER; + int Res = internal_sigaction(SIGSEGV, &SigAct, &AppSigAct); + CHECK(Res == 0); + VPrintf(1, "Registered for SIGSEGV handler\n"); +} + +} // namespace __esan |
