[Lldb-commits] [PATCH] D54221: Add setting to require hardware breakpoints.

Kamil Rytarowski via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Wed Nov 7 13:17:08 PST 2018

krytarowski added a comment.

On NetBSD one has to check PaX MPROTECT property of a traced process.

Something like:

  bool IsMPROTECT(pid_t pid) {
  #if defined(__NetBSD__)
    int mib[3];
    int paxflags;
    size_t len = sizeof(paxflags);
    mib[0] = CTL_PROC;
    mib[1] = pid;
    mib[2] = PROC_PID_PAXFLAGS;
    if (sysctl(mib, 3, &paxflags, &len, NULL, 0) != 0)
      err(EXIT_FAILURE, "sysctl"); /* or return true */
    return !!(paxflags & CTL_PROC_PAXFLAGS_MPROTECT);
    return false;

If IsMPROTECT is true, then we must use hardware assisted/emulated breakpoints.



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