gem5/util/statetrace/arch/sparc/tracechild.cc
2011-04-15 10:44:06 -07:00

473 lines
17 KiB
C++

/*
* Copyright (c) 2006-2007 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
*/
#include <sys/ptrace.h>
#include <stdint.h>
#include <cerrno>
#include <iostream>
#include "arch/sparc/tracechild.hh"
using namespace std;
bool
SparcTraceChild::sendState(int socket)
{
uint64_t regVal = 0;
for (int x = 0; x <= I7; x++) {
regVal = getRegVal(x);
if (write(socket, &regVal, sizeof(regVal)) == -1) {
cerr << "Write failed! " << strerror(errno) << endl;
tracing = false;
return false;
}
}
regVal = getRegVal(PC);
if (write(socket, &regVal, sizeof(regVal)) == -1) {
cerr << "Write failed! " << strerror(errno) << endl;
tracing = false;
return false;
}
regVal = getRegVal(NPC);
if (write(socket, &regVal, sizeof(regVal)) == -1) {
cerr << "Write failed! " << strerror(errno) << endl;
tracing = false;
return false;
}
regVal = getRegVal(CCR);
if (write(socket, &regVal, sizeof(regVal)) == -1) {
cerr << "Write failed! " << strerror(errno) << endl;
tracing = false;
return false;
}
return true;
}
int64_t
getRegs(regs & myregs, fpu & myfpu, uint64_t * locals,
uint64_t * inputs, int num)
{
assert(num < SparcTraceChild::numregs && num >= 0);
switch (num) {
//Global registers
case SparcTraceChild::G0: return 0;
case SparcTraceChild::G1: return myregs.r_g1;
case SparcTraceChild::G2: return myregs.r_g2;
case SparcTraceChild::G3: return myregs.r_g3;
case SparcTraceChild::G4: return myregs.r_g4;
case SparcTraceChild::G5: return myregs.r_g5;
case SparcTraceChild::G6: return myregs.r_g6;
case SparcTraceChild::G7: return myregs.r_g7;
//Output registers
case SparcTraceChild::O0: return myregs.r_o0;
case SparcTraceChild::O1: return myregs.r_o1;
case SparcTraceChild::O2: return myregs.r_o2;
case SparcTraceChild::O3: return myregs.r_o3;
case SparcTraceChild::O4: return myregs.r_o4;
case SparcTraceChild::O5: return myregs.r_o5;
case SparcTraceChild::O6: return myregs.r_o6;
case SparcTraceChild::O7: return myregs.r_o7;
//Local registers
case SparcTraceChild::L0: return locals[0];
case SparcTraceChild::L1: return locals[1];
case SparcTraceChild::L2: return locals[2];
case SparcTraceChild::L3: return locals[3];
case SparcTraceChild::L4: return locals[4];
case SparcTraceChild::L5: return locals[5];
case SparcTraceChild::L6: return locals[6];
case SparcTraceChild::L7: return locals[7];
//Input registers
case SparcTraceChild::I0: return inputs[0];
case SparcTraceChild::I1: return inputs[1];
case SparcTraceChild::I2: return inputs[2];
case SparcTraceChild::I3: return inputs[3];
case SparcTraceChild::I4: return inputs[4];
case SparcTraceChild::I5: return inputs[5];
case SparcTraceChild::I6: return inputs[6];
case SparcTraceChild::I7: return inputs[7];
//Floating point
case SparcTraceChild::F0: return myfpu.f_fpstatus.fpu_fr[0];
case SparcTraceChild::F2: return myfpu.f_fpstatus.fpu_fr[1];
case SparcTraceChild::F4: return myfpu.f_fpstatus.fpu_fr[2];
case SparcTraceChild::F6: return myfpu.f_fpstatus.fpu_fr[3];
case SparcTraceChild::F8: return myfpu.f_fpstatus.fpu_fr[4];
case SparcTraceChild::F10: return myfpu.f_fpstatus.fpu_fr[5];
case SparcTraceChild::F12: return myfpu.f_fpstatus.fpu_fr[6];
case SparcTraceChild::F14: return myfpu.f_fpstatus.fpu_fr[7];
case SparcTraceChild::F16: return myfpu.f_fpstatus.fpu_fr[8];
case SparcTraceChild::F18: return myfpu.f_fpstatus.fpu_fr[9];
case SparcTraceChild::F20: return myfpu.f_fpstatus.fpu_fr[10];
case SparcTraceChild::F22: return myfpu.f_fpstatus.fpu_fr[11];
case SparcTraceChild::F24: return myfpu.f_fpstatus.fpu_fr[12];
case SparcTraceChild::F26: return myfpu.f_fpstatus.fpu_fr[13];
case SparcTraceChild::F28: return myfpu.f_fpstatus.fpu_fr[14];
case SparcTraceChild::F30: return myfpu.f_fpstatus.fpu_fr[15];
case SparcTraceChild::F32: return myfpu.f_fpstatus.fpu_fr[16];
case SparcTraceChild::F34: return myfpu.f_fpstatus.fpu_fr[17];
case SparcTraceChild::F36: return myfpu.f_fpstatus.fpu_fr[18];
case SparcTraceChild::F38: return myfpu.f_fpstatus.fpu_fr[19];
case SparcTraceChild::F40: return myfpu.f_fpstatus.fpu_fr[20];
case SparcTraceChild::F42: return myfpu.f_fpstatus.fpu_fr[21];
case SparcTraceChild::F44: return myfpu.f_fpstatus.fpu_fr[22];
case SparcTraceChild::F46: return myfpu.f_fpstatus.fpu_fr[23];
case SparcTraceChild::F48: return myfpu.f_fpstatus.fpu_fr[24];
case SparcTraceChild::F50: return myfpu.f_fpstatus.fpu_fr[25];
case SparcTraceChild::F52: return myfpu.f_fpstatus.fpu_fr[26];
case SparcTraceChild::F54: return myfpu.f_fpstatus.fpu_fr[27];
case SparcTraceChild::F56: return myfpu.f_fpstatus.fpu_fr[28];
case SparcTraceChild::F58: return myfpu.f_fpstatus.fpu_fr[29];
case SparcTraceChild::F60: return myfpu.f_fpstatus.fpu_fr[30];
case SparcTraceChild::F62: return myfpu.f_fpstatus.fpu_fr[31];
//Miscelaneous
case SparcTraceChild::FSR: return myfpu.f_fpstatus.Fpu_fsr;
case SparcTraceChild::FPRS: return myregs.r_fprs;
case SparcTraceChild::PC: return myregs.r_tpc;
case SparcTraceChild::NPC: return myregs.r_tnpc;
case SparcTraceChild::Y: return myregs.r_y;
case SparcTraceChild::CWP:
return (myregs.r_tstate >> 0) & ((1 << 5) - 1);
case SparcTraceChild::PSTATE:
return (myregs.r_tstate >> 8) & ((1 << 13) - 1);
case SparcTraceChild::ASI:
return (myregs.r_tstate >> 24) & ((1 << 8) - 1);
case SparcTraceChild::CCR:
return (myregs.r_tstate >> 32) & ((1 << 8) - 1);
default:
assert(0);
return 0;
}
}
bool
SparcTraceChild::update(int pid)
{
memcpy(&oldregs, &theregs, sizeof(regs));
memcpy(&oldfpregs, &thefpregs, sizeof(fpu));
memcpy(oldLocals, locals, 8 * sizeof(uint64_t));
memcpy(oldInputs, inputs, 8 * sizeof(uint64_t));
if (ptrace(PTRACE_GETREGS, pid, &theregs, 0) != 0) {
cerr << "Update failed" << endl;
return false;
}
uint64_t stackPointer = getSP();
uint64_t stackBias = 2047;
bool v9 = stackPointer % 2;
for (unsigned int x = 0; x < 8; x++) {
uint64_t localAddr = stackPointer +
(v9 ? (stackBias + x * 8) : (x * 4));
locals[x] = ptrace(PTRACE_PEEKTEXT, pid, localAddr, 0);
if (!v9) locals[x] >>= 32;
uint64_t inputAddr = stackPointer +
(v9 ? (stackBias + x * 8 + (8 * 8)) : (x * 4 + 8 * 4));
inputs[x] = ptrace(PTRACE_PEEKTEXT, pid, inputAddr, 0);
if (!v9) inputs[x] >>= 32;
}
if (ptrace(PTRACE_GETFPREGS, pid, &thefpregs, 0) != 0)
return false;
for (unsigned int x = 0; x < numregs; x++)
regDiffSinceUpdate[x] = (getRegVal(x) != getOldRegVal(x));
return true;
}
SparcTraceChild::SparcTraceChild()
{
for (unsigned int x = 0; x < numregs; x++)
regDiffSinceUpdate[x] = false;
}
int
SparcTraceChild::getTargets(uint32_t inst, uint64_t pc, uint64_t npc,
uint64_t &target1, uint64_t &target2)
{
//We can identify the instruction categories we care about using the top
//10 bits of the instruction, excluding the annul bit in the 3rd most
//significant bit position and the condition field. We'll call these
//bits the "sig" for signature.
uint32_t sig = (inst >> 22) & 0x307;
uint32_t cond = (inst >> 25) & 0xf;
bool annul = (inst & (1 << 29));
//Check if it's a ba...
bool ba = (cond == 0x8) &&
(sig == 0x1 || sig == 0x2 || sig == 0x5 || sig == 0x6);
//or a bn...
bool bn = (cond == 0x0) &&
(sig == 0x1 || sig == 0x2 || sig == 0x5 || sig == 0x6);
//or a bcc
bool bcc = (cond & 0x7) &&
(sig == 0x1 || sig == 0x2 || sig == 0x3 || sig == 0x5 || sig == 0x6);
if (annul) {
if (bcc) {
target1 = npc;
target2 = npc + 4;
return 2;
} else if(ba) {
//This branches immediately to the effective address of the branch
//which we'll have to calculate.
uint64_t disp = 0;
int64_t extender = 0;
//Figure out how big the displacement field is, and grab the bits
if (sig == 0x1 || sig == 0x5) {
disp = inst & ((1 << 19) - 1);
extender = 1 << 18;
} else {
disp = inst & ((1 << 22) - 1);
extender = 1 << 21;
}
//This does sign extension, believe it or not.
disp = (disp ^ extender) - extender;
//Multiply the displacement by 4. I'm assuming the compiler is
//smart enough to turn this into a shift.
disp *= 4;
target1 = pc + disp;
} else if(bn)
target1 = npc + 4;
else
target1 = npc;
return 1;
} else {
target1 = npc;
return 1;
}
}
bool
SparcTraceChild::step()
{
//Increment the count of the number of instructions executed
instructions++;
//Two important considerations are that the address of the instruction
//being breakpointed should be word (64bit) aligned, and that both the
//next instruction and the instruction after that need to be breakpointed
//so that annulled branches will still stop as well.
/*
* Useful constants
*/
const static uint64_t breakInst = 0x91d02001;
const static uint64_t lowBreakInst = breakInst;
const static uint64_t highBreakInst = breakInst << 32;
const static uint64_t breakWord = breakInst | (breakInst << 32);
const static uint64_t lowMask = 0xFFFFFFFFULL;
const static uint64_t highMask = lowMask << 32;
/*
* storage for the original contents of the child process's memory
*/
uint64_t originalInst, originalAnnulInst;
/*
* Get information about where the process is and is headed next.
*/
uint64_t currentPC = getRegVal(PC);
bool unalignedPC = currentPC & 7;
uint64_t alignedPC = currentPC & (~7);
uint64_t nextPC = getRegVal(NPC);
bool unalignedNPC = nextPC & 7;
uint64_t alignedNPC = nextPC & (~7);
//Get the current instruction
uint64_t curInst = ptrace(PTRACE_PEEKTEXT, pid, alignedPC);
curInst = unalignedPC ? (curInst & 0xffffffffULL) : (curInst >> 32);
uint64_t bp1, bp2;
int numTargets = getTargets(curInst, currentPC, nextPC, bp1, bp2);
assert(numTargets == 1 || numTargets == 2);
bool unalignedBp1 = bp1 & 7;
uint64_t alignedBp1 = bp1 & (~7);
bool unalignedBp2 = bp2 & 7;
uint64_t alignedBp2 = bp2 & (~7);
uint64_t origBp1, origBp2;
/*
* Set the first breakpoint
*/
origBp1 = ptrace(PTRACE_PEEKTEXT, pid, alignedBp1, 0);
uint64_t newBp1 = origBp1;
newBp1 &= unalignedBp1 ? highMask : lowMask;
newBp1 |= unalignedBp1 ? lowBreakInst : highBreakInst;
if (ptrace(PTRACE_POKETEXT, pid, alignedBp1, newBp1) != 0)
cerr << "Poke failed" << endl;
/*
* Set the second breakpoint if necessary
*/
if (numTargets == 2) {
origBp2 = ptrace(PTRACE_PEEKTEXT, pid, alignedBp2, 0);
uint64_t newBp2 = origBp2;
newBp2 &= unalignedBp2 ? highMask : lowMask;
newBp2 |= unalignedBp2 ? lowBreakInst : highBreakInst;
if (ptrace(PTRACE_POKETEXT, pid, alignedBp2, newBp2) != 0)
cerr << "Poke failed" << endl;
}
/*
* Restart the child process
*/
//Note that the "addr" parameter is supposed to be ignored, but in at
//least one version of the kernel, it must be 1 or it will set what
//pc to continue from
if (ptrace(PTRACE_CONT, pid, 1, 0) != 0)
cerr << "Cont failed" << endl;
doWait();
/*
* Update our record of the child's state
*/
update(pid);
/*
* Put back the original contents of the childs address space in the
* reverse order.
*/
if (numTargets == 2) {
if (ptrace(PTRACE_POKETEXT, pid, alignedBp2, origBp2) != 0)
cerr << "Poke failed" << endl;
}
if (ptrace(PTRACE_POKETEXT, pid, alignedBp1, origBp1) != 0)
cerr << "Poke failed" << endl;
}
int64_t
SparcTraceChild::getRegVal(int num)
{
return getRegs(theregs, thefpregs, locals, inputs, num);
}
int64_t
SparcTraceChild::getOldRegVal(int num)
{
return getRegs(oldregs, oldfpregs, oldLocals, oldInputs, num);
}
ostream &
SparcTraceChild::outputStartState(ostream & os)
{
bool v8 = false;
uint64_t sp = getSP();
if (sp % 2) {
os << "Detected a 64 bit executable.\n";
v8 = false;
} else {
os << "Detected a 32 bit executable.\n";
v8 = true;
}
uint64_t pc = getPC();
char obuf[1024];
sprintf(obuf, "Initial stack pointer = 0x%016llx\n", sp);
os << obuf;
sprintf(obuf, "Initial program counter = 0x%016llx\n", pc);
os << obuf;
if (!v8) {
//Take out the stack bias
sp += 2047;
}
//Output the window save area
for (unsigned int x = 0; x < 16; x++) {
uint64_t regspot = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) regspot = regspot >> 32;
sprintf(obuf, "0x%016llx: Window save %d = 0x%016llx\n",
sp, x+1, regspot);
os << obuf;
sp += v8 ? 4 : 8;
}
//Output the argument count
uint64_t cargc = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) cargc = cargc >> 32;
sprintf(obuf, "0x%016llx: Argc = 0x%016llx\n", sp, cargc);
os << obuf;
sp += v8 ? 4 : 8;
//Output argv pointers
int argCount = 0;
uint64_t cargv;
do {
cargv = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) cargv = cargv >> 32;
sprintf(obuf, "0x%016llx: argv[%d] = 0x%016llx\n",
sp, argCount++, cargv);
os << obuf;
sp += v8 ? 4 : 8;
} while(cargv);
//Output the envp pointers
int envCount = 0;
uint64_t cenvp;
do {
cenvp = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) cenvp = cenvp >> 32;
sprintf(obuf, "0x%016llx: envp[%d] = 0x%016llx\n",
sp, envCount++, cenvp);
os << obuf;
sp += v8 ? 4 : 8;
} while (cenvp);
uint64_t auxType, auxVal;
do {
auxType = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) auxType = auxType >> 32;
sp += (v8 ? 4 : 8);
auxVal = ptrace(PTRACE_PEEKDATA, pid, sp, 0);
if (v8) auxVal = auxVal >> 32;
sp += (v8 ? 4 : 8);
sprintf(obuf, "0x%016llx: Auxiliary vector = {0x%016llx, 0x%016llx}\n",
sp - 8, auxType, auxVal);
os << obuf;
} while (auxType != 0 || auxVal != 0);
//Print out the argument strings, environment strings, and file name.
string current;
uint64_t buf;
uint64_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%016llx: \"%s\"\n",
currentStart, current.c_str());
os << obuf;
current = "";
currentStart = sp + x + 1;
}
}
sp += (v8 ? 4 : 8);
clearedInitialPadding = clearedInitialPadding || buf != 0;
} while (!clearedInitialPadding || buf != 0);
return os;
}
TraceChild *
genTraceChild()
{
return new SparcTraceChild;
}