system_events.cc revision 720 
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
37void
38SkipFuncEvent::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
55FnEvent::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
62void
63FnEvent::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}
110