kern/system_events.cc

   1 /*
   2  * Copyright (c) 2003 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "cpu/exec_context.hh"
  30 #include "cpu/base_cpu.hh"
  31 #include "cpu/full_cpu/bpred.hh"
  32 #include "cpu/full_cpu/full_cpu.hh"
  33 #include "kern/system_events.hh"
  34 #include "sim/system.hh"
  35 #include "sim/sw_context.hh"
  36
  37 void
  38 SkipFuncEvent::process(ExecContext *xc)
  39 {
  40     Addr newpc = xc->regs.intRegFile[ReturnAddressReg];
  41
  42     DPRINTF(PCEvent, "skipping %s: pc=%x, newpc=%x\n", description,
  43             xc->regs.pc, newpc);
  44
  45     xc->regs.pc = newpc;
  46     xc->regs.npc = xc->regs.pc + sizeof(MachInst);
  47
  48     BranchPred *bp = xc->cpu->getBranchPred();
  49     if (bp != NULL) {
  50         bp->popRAS(xc->thread_num);
  51     }
  52 }
  53
  54
  55 FnEvent::FnEvent(PCEventQueue *q, const std::string & desc, System *system)
  56     : PCEvent(q, desc), _name(desc)
  57 {
  58     myBin = system->getBin(desc);
  59     assert(myBin);
  60 }
  61
  62 void
  63 FnEvent::process(ExecContext *xc)
  64 {
  65     if (xc->misspeculating())
  66         return;
  67     assert(xc->system->bin && "FnEvent must be in a binned system");
  68     SWContext *ctx = xc->swCtx;
  69     DPRINTF(TCPIP, "%s: %s Event!!!\n", xc->system->name(), description);
  70
  71     if (ctx && !ctx->callStack.empty()) {
  72         DPRINTF(TCPIP, "already a callstack!\n");
  73         fnCall *last = ctx->callStack.top();
  74
  75         if (last->name == "idle_thread")
  76             ctx->calls++;
  77
  78         if (!xc->system->findCaller(myname(), "" ) &&
  79             !xc->system->findCaller(myname(), last->name)) {
  80
  81             DPRINTF(TCPIP, "but can't find parent %s\n", last->name);
  82             return;
  83         }
  84         ctx->calls--;
  85
  86         //assert(!ctx->calls && "on a binned fn, calls should == 0 (but can happen in boot)");
  87     } else {
  88         DPRINTF(TCPIP, "no callstack yet\n");
  89         if (!xc->system->findCaller(myname(), "")) {
  90             DPRINTF(TCPIP, "not the right function, returning\n");
  91             return;
  92         }
  93         if (!ctx)  {
  94             DPRINTF(TCPIP, "creating new context for %s\n", myname());
  95             ctx = new SWContext;
  96             xc->swCtx = ctx;
  97         }
  98     }
  99     DPRINTF(TCPIP, "adding fn %s to context\n", myname());
 100     fnCall *call = new fnCall;
 101     call->myBin = myBin;
 102     call->name = myname();
 103     ctx->callStack.push(call);
 104     myBin->activate();
 105     xc->system->fnCalls++;
 106     DPRINTF(TCPIP, "fnCalls for %s is %d\n", description,
 107             xc->system->fnCalls.value());
 108     xc->system->dumpState(xc);
 109 }