+++ /dev/null
-/*
- * 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 <iostream>
-#include <errno.h>
-#include <sys/ptrace.h>
-#include <stdint.h>
-
-#include "tracechild_sparc.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, ®Val, sizeof(regVal)) == -1) {
- cerr << "Write failed! " << strerror(errno) << endl;
- tracing = false;
- return false;
- }
- }
- regVal = getRegVal(PC);
- if (write(socket, ®Val, sizeof(regVal)) == -1) {
- cerr << "Write failed! " << strerror(errno) << endl;
- tracing = false;
- return false;
- }
- regVal = getRegVal(NPC);
- if (write(socket, ®Val, sizeof(regVal)) == -1) {
- cerr << "Write failed! " << strerror(errno) << endl;
- tracing = false;
- return false;
- }
- regVal = getRegVal(CCR);
- if (write(socket, ®Val, 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;
-}
-
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