gem5/util/statetrace/arch/tracechild_arm.cc
2009-07-27 00:53:39 -07:00

215 lines
6 KiB
C++

/*
* Copyright (c) 2006-2009 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
* Gabe Black
*/
#include <iostream>
#include <errno.h>
#include <stdint.h>
#include <cstring>
#include "tracechild_arm.hh"
using namespace std;
const char* ARMTraceChild::regNames[numregs] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "fp", "r12", "sp", "lr", "pc",
"cpsr" };
ARMTraceChild::ARMTraceChild()
{
for (int x = 0; x < numregs; x++)
regDiffSinceUpdate[x] = false;
}
bool ARMTraceChild::sendState(int socket)
{
uint32_t regVal = 0;
for(int x = 0; x < numregs; x++)
{
regVal = getRegVal(x);
if(write(socket, &regVal, sizeof(regVal)) == -1)
{
cerr << "Write failed! " << strerror(errno) << endl;
tracing = false;
return false;
}
}
return true;
}
uint32_t ARMTraceChild::getRegs(user_regs &myregs, int num)
{
assert(num < numregs && num >= 0);
return myregs.uregs[num];
}
bool ARMTraceChild::update(int pid)
{
oldregs = regs;
if(ptrace(PTRACE_GETREGS, pid, 0, &regs) != 0)
{
cerr << "update: " << strerror(errno) << endl;
return false;
}
for(unsigned int x = 0; x < numregs; x++)
regDiffSinceUpdate[x] = (getRegVal(x) != getOldRegVal(x));
return true;
}
int64_t ARMTraceChild::getRegVal(int num)
{
return getRegs(regs, num);
}
int64_t ARMTraceChild::getOldRegVal(int num)
{
return getRegs(oldregs, num);
}
char * ARMTraceChild::printReg(int num)
{
sprintf(printBuffer, "0x%08X", (uint32_t)getRegVal(num));
return printBuffer;
}
ostream & ARMTraceChild::outputStartState(ostream & os)
{
uint32_t sp = getSP();
uint32_t pc = getPC();
uint32_t highestInfo = 0;
char obuf[1024];
sprintf(obuf, "Initial stack pointer = 0x%08x\n", sp);
os << obuf;
sprintf(obuf, "Initial program counter = 0x%08x\n", pc);
os << obuf;
//Output the argument count
int32_t cargc = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
sprintf(obuf, "0x%08x: Argc = 0x%08x\n", sp, cargc);
os << obuf;
sp += 4;
//Output argv pointers
int argCount = 0;
int32_t cargv;
do
{
cargv = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
sprintf(obuf, "0x%08x: argv[%d] = 0x%08x\n",
sp, argCount++, cargv);
if(cargv)
if(highestInfo < cargv)
highestInfo = cargv;
os << obuf;
sp += 4;
} while(cargv);
//Output the envp pointers
int envCount = 0;
uint32_t cenvp;
do
{
cenvp = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
sprintf(obuf, "0x%08x: envp[%d] = 0x%08x\n",
sp, envCount++, cenvp);
os << obuf;
sp += 4;
} while(cenvp);
uint32_t auxType, auxVal;
do
{
auxType = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
sp += 4;
auxVal = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
sp += 4;
sprintf(obuf, "0x%08x: Auxiliary vector = {0x%08x, 0x%08x}\n",
sp - 8, auxType, auxVal);
os << obuf;
} while(auxType != 0 || auxVal != 0);
//Print out the argument strings, environment strings, and file name.
string current;
uint32_t buf;
uint32_t currentStart = sp;
bool clearedInitialPadding = false;
do
{
buf = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
char * cbuf = (char *)&buf;
for(int x = 0; x < sizeof(uint32_t); x++)
{
if(cbuf[x])
current += cbuf[x];
else
{
sprintf(obuf, "0x%08x: \"%s\"\n",
currentStart, current.c_str());
os << obuf;
current = "";
currentStart = sp + x + 1;
}
}
sp += 4;
clearedInitialPadding = clearedInitialPadding || buf != 0;
} while(!clearedInitialPadding || buf != 0 || sp <= highestInfo);
return os;
}
bool ARMTraceChild::step()
{
const uint32_t bkpt_inst = 0xE1200070;
const uint32_t bkpt_mask = 0xFFF000F0;
const uint32_t swi_inst = 0x0F0000000;
const uint32_t swi_mask = 0x0F0000000;
uint32_t next_op = ptrace(PTRACE_PEEKDATA, pid, getPC(), 0);
if ((next_op & swi_mask) == swi_inst) {
ptrace(PTRACE_POKEDATA, pid, next_op + sizeof(uint32_t), bkpt_inst);
ptraceSingleStep();
ptrace(PTRACE_POKEDATA, pid, next_op + sizeof(uint32_t), next_op);
}
else
{
ptraceSingleStep();
}
}
TraceChild * genTraceChild()
{
return new ARMTraceChild;
}