From eab89a09d26fd39cdbb3ddd826465c8661403b89 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Wed, 2 Mar 2011 22:53:11 -0800 Subject: Statetrace: Accomodate cross compiling statetrace with scons. --HG-- rename : util/statetrace/arch/tracechild_amd64.cc => util/statetrace/arch/amd64/tracechild.cc rename : util/statetrace/arch/tracechild_amd64.hh => util/statetrace/arch/amd64/tracechild.hh rename : util/statetrace/arch/tracechild_arm.cc => util/statetrace/arch/arm/tracechild.cc rename : util/statetrace/arch/tracechild_arm.hh => util/statetrace/arch/arm/tracechild.hh rename : util/statetrace/arch/tracechild_i386.cc => util/statetrace/arch/i386/tracechild.cc rename : util/statetrace/arch/tracechild_i386.hh => util/statetrace/arch/i386/tracechild.hh rename : util/statetrace/arch/tracechild_sparc.cc => util/statetrace/arch/sparc/tracechild.cc rename : util/statetrace/arch/tracechild_sparc.hh => util/statetrace/arch/sparc/tracechild.hh rename : util/statetrace/tracechild_arch.cc => util/statetrace/base/arch_check.h rename : util/statetrace/regstate.hh => util/statetrace/base/regstate.hh rename : util/statetrace/statetrace.cc => util/statetrace/base/statetrace.cc rename : util/statetrace/tracechild.cc => util/statetrace/base/tracechild.cc rename : util/statetrace/tracechild.hh => util/statetrace/base/tracechild.hh --- util/statetrace/base/tracechild.cc | 147 +++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 util/statetrace/base/tracechild.cc (limited to 'util/statetrace/base/tracechild.cc') diff --git a/util/statetrace/base/tracechild.cc b/util/statetrace/base/tracechild.cc new file mode 100644 index 000000000..b5665ff37 --- /dev/null +++ b/util/statetrace/base/tracechild.cc @@ -0,0 +1,147 @@ +/* + * 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 "tracechild.hh" +#include +#include +#include +#include +#include + +using namespace std; + +bool +TraceChild::startTracing(const char * pathToFile, char * const argv[]) +{ + instructions = 0; + pid = fork(); + if (pid == -1) { + cout << "fork failed" << endl; + return false; + } else if (pid == 0) { + //We're the child. Get things ready and then exec the program to trace. + //Let our parent trace us + if (ptrace(PTRACE_TRACEME, 0, 0, 0) == -1) { + cout << "Failure calling TRACEME\n" << strerror(errno) << endl; + return false; + } + + //Set up an empty environment for the child... We would want to + //specify this somehow at some point + char * env[] = {NULL}; + + //Start the program to trace + execve(pathToFile, argv, env); + + //We should never get here, so this is an error! + cout << "Exec failed\n" << strerror(errno) << endl; + return false; + } + + //From this point forward, we know we're in the parent process. + if (!doWait()) { + cout << "Didn't wait successfully" << endl; + return false; + } + tracing = true; + return true; +} + +bool +TraceChild::stopTracing() +{ + if (ptrace(PTRACE_KILL, pid, 0, 0) != 0) + return false; + tracing = false; + return true; +} + +bool +TraceChild::step() +{ + ptraceSingleStep(); +} + +bool +TraceChild::ptraceSingleStep() +{ + if (!tracing) { + cout << "Not tracing!" << endl; + return false; + } + if (ptrace(PTRACE_SINGLESTEP, pid, 0, 0) != 0) { + switch (errno) { + case EBUSY: cout << "EBUSY" << endl; break; + case EFAULT: cout << "EFAULT" << endl; break; + case EIO: cout << "EIO" << endl; break; + case EPERM: cout << "EPERM" << endl; break; + case ESRCH: cout << "ESRCH" << endl; break; + default: cout << "Unknown error" << endl; break; + } + cout << "Not able to single step!" << endl; + tracing == false; + return false; + } + doWait(); + update(pid); +} + +bool +TraceChild::doWait() +{ + int wait_val; + wait(&wait_val); + if (WIFEXITED(wait_val)) { + cerr << "Program exited! Exit status is " + << WEXITSTATUS(wait_val) << endl; + cerr << "Executed " << instructions + << " instructions." << endl; + tracing = false; + return false; + } + if (WIFSIGNALED(wait_val)) { + if (WTERMSIG(wait_val)) + cerr << "Program terminated by signal " + << WTERMSIG(wait_val) << endl; + if (WCOREDUMP(wait_val)) + cerr << "Program core dumped!" << endl; + tracing = false; + cerr << "Executed " << instructions + << " instructions." << endl; + return false; + } + if (WIFSTOPPED(wait_val) && WSTOPSIG(wait_val) != SIGTRAP) { + cerr << "Program stopped by signal " << WSTOPSIG(wait_val) << endl; + tracing = false; + cerr << "Executed " << instructions << " instructions." << endl; + return false; + } + return true; +} -- cgit v1.2.3