gem5/util/statetrace/arch/tracechild_amd64.hh
Gabe Black b4087e0e44 Statetrace: Make statetrace patch amd64 executables for true single stepping after system calls.
Because of peculiarities in how system calls are returned from, single stepping executes some system calls and the instruction following them in a single step. Statetrace now patches the executable image when it detects a system call to force "correct" behavior, aka the appearance of stepping one instruction every single time.

--HG--
extra : convert_revision : ac6243a2e00ff98f827b005efd27b4dc5be4f774
2007-07-29 12:37:35 -07:00

110 lines
3.1 KiB
C++

/*
* Copyright (c) 2007 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: Gabe Black
*/
#ifndef REGSTATE_AMD64_HH
#define REGSTATE_AMD64_HH
#include <sys/user.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <assert.h>
#include <string>
#include "tracechild.hh"
class AMD64TraceChild : public TraceChild
{
public:
enum RegNum
{
//GPRs
RAX, RCX, RDX, RBX,
//Base pointer and stack pointer
RSP, RBP,
//Index registers
RSI, RDI,
//New 64 bit mode registers
R8, R9, R10, R11, R12, R13, R14, R15,
//Segmentation registers
CS, DS, ES, FS, GS, SS, FS_BASE, GS_BASE,
//PC
RIP,
//Flags
EFLAGS,
numregs
};
private:
char printBuffer [256];
static char * regNames[numregs];
int64_t getRegs(user_regs_struct & myregs, int num);
user_regs_struct regs;
user_regs_struct oldregs;
bool regDiffSinceUpdate[numregs];
uint64_t findSyscall();
protected:
bool update(int pid);
public:
AMD64TraceChild();
bool sendState(int socket);
int getNumRegs()
{
return numregs;
}
bool diffSinceUpdate(int num)
{
assert(num < numregs && num >= 0);
return regDiffSinceUpdate[num];
}
std::string getRegName(int num)
{
assert(num < numregs && num >= 0);
return regNames[num];
}
int64_t getRegVal(int num);
int64_t getOldRegVal(int num);
uint64_t getPC() {return getRegVal(RIP);}
uint64_t getSP() {return getRegVal(RSP);}
std::ostream & outputStartState(std::ostream & output);
char * printReg(int num);
bool step();
};
#endif