l4/pkg/plr/server/src/fault_handlers/observer.cc

   1 /*
   2  * observer.cc --
   3  *
   4  *    General fault observer functions
   5  *
   6  * (c) 2011-2012 Björn Döbel <doebel@os.inf.tu-dresden.de>,
   7  *     economic rights: Technische Universität Dresden (Germany)
   8  * This file is part of TUD:OS and distributed under the terms of the
   9  * GNU General Public License 2.
  10  * Please see the COPYING-GPL-2 file for details.
  11  */
  12
  13 #include "observers.h"
  14 #include "../configuration"
  15
  16 Romain::Observer*
  17 Romain::ObserverFactory::CreateObserver(char const *name)
  18 {
  19 #define CASE(string, object) \
  20         do { \
  21                 if (strcmp(name, string) == 0) { \
  22                         return object; \
  23                 } \
  24         } while (0)
  25
  26         CASE("simple",     new SimpleDebugObserver());
  27         CASE("trap",       new TrapObserver());
  28         CASE("vcpu_state", new PrintVCPUStateObserver());
  29         CASE("pagefaults", new PageFaultObserver());
  30         CASE("syscalls",   new SyscallObserver());
  31         CASE("swifi",      SWIFIObserver::Create());
  32         CASE("kip-time",   KIPTimeObserver::Create());
  33         CASE("trap_limit", TrapLimitObserver::Create());
  34         CASE("threads",    PThreadLockObserver::Create());
  35
  36 #if 0
  37         if (strcmp(name, "gdb") == 0) {
  38                 int port = ConfigIntValue("gdbstub:port");
  39                 if (port > 0) { // want TCP connection
  40                         return new Romain::GDBServerObserver(new Romain::TCPConnection(port));
  41                 } else { // want serial line
  42                         return new Romain::GDBServerObserver(new Romain::SerialConnection());
  43                 }
  44         }
  45 #endif
  46
  47         enter_kdebug("no observer found.");
  48         return NULL;
  49
  50 #undef CASE
  51 }
  52
  53
  54 bool Romain::Observer::entry_reason_is_int3(L4vcpu::Vcpu* vcpu,
  55                                             Romain::App_instance *,
  56                                             Romain::App_model *am)
  57 {
  58         /*
  59          * Some other debugger component might already have
  60          * replaced the opcode with sth. different (e.g., for emulating
  61          * a breakpoint. In this case everything has become invalid
  62          * right now and we skip, too.
  63          */
  64         l4_addr_t remote = vcpu->r()->ip - 1;
  65         unsigned char op = *(unsigned char*)am->rm()->remote_to_local(remote, 0);
  66         return (vcpu->r()->trapno == 3) && (op == 0xCC);
  67 }
  68
  69