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The llvm::sys::AddSignalHandler function (as well as related routines) in lib/Support/Unix/Signals.inc currently registers a signal handler routine via "sigaction". When this handler is called due to a SIGSEGV, SIGILL or similar signal, it will show a stack backtrace, deactivate the handler, and then simply return to the operating system. The intent is that the OS will now retry execution at the same location as before, which ought to again trigger the same error condition and cause the same signal to be delivered again. Since the hander is now deactivated, the OS will take its default action (usually, terminate the program and possibly create a core dump). However, this method doesn't work reliably on System Z: With certain signals (namely SIGILL, SIGFPE, and SIGTRAP), the program counter stored by the kernel on the signal stack frame (which is the location where execution will resume) is not the instruction that triggered the fault, but then instruction *after it*. When the LLVM signal handler simply returns to the kernel, execution will then resume at *that* address, which will not trigger the problem again, but simply go on and execute potentially unrelated code leading to random errors afterwards. To fix this, the patch simply goes and re-raises the signal in question directly from the handler instead of returning from it. This is done only on System Z and only for those signals that have this particular problem. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181010 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| Host.inc | ||
| Memory.inc | ||
| Mutex.inc | ||
| Path.inc | ||
| PathV2.inc | ||
| Process.inc | ||
| Program.inc | ||
| README.txt | ||
| RWMutex.inc | ||
| Signals.inc | ||
| system_error.inc | ||
| ThreadLocal.inc | ||
| TimeValue.inc | ||
| Unix.h | ||
| Watchdog.inc | ||
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.