diff options
Diffstat (limited to 'util/statetrace')
| -rw-r--r-- | util/statetrace/arch/tracechild_arm.cc | 49 | ||||
| -rw-r--r-- | util/statetrace/arch/tracechild_arm.hh | 21 | ||||
| -rw-r--r-- | util/statetrace/statetrace.cc | 13 |
3 files changed, 68 insertions, 15 deletions
diff --git a/util/statetrace/arch/tracechild_arm.cc b/util/statetrace/arch/tracechild_arm.cc index b52c0694a..b03cb208b 100644 --- a/util/statetrace/arch/tracechild_arm.cc +++ b/util/statetrace/arch/tracechild_arm.cc @@ -1,4 +1,16 @@ /* + * Copyright (c) 2010 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * * Copyright (c) 2006-2009 The Regents of The University of Michigan * All rights reserved. * @@ -33,6 +45,7 @@ #include <errno.h> #include <stdint.h> #include <cstring> +#include <cstdio> #include "tracechild_arm.hh" @@ -46,6 +59,8 @@ const char* ARMTraceChild::regNames[numregs] = { ARMTraceChild::ARMTraceChild() { + foundMvn = false; + for (int x = 0; x < numregs; x++) { memset(®s, 0, sizeof(regs)); memset(&oldregs, 0, sizeof(regs)); @@ -79,7 +94,7 @@ bool ARMTraceChild::sendState(int socket) toSend -= sent; messagePtr += sent; } - + return true; } @@ -97,7 +112,7 @@ bool ARMTraceChild::update(int pid) cerr << "update: " << strerror(errno) << endl; return false; } - + for(unsigned int x = 0; x < numregs; x++) regDiffSinceUpdate[x] = (getRegVal(x) != getOldRegVal(x)); return true; @@ -207,25 +222,39 @@ bool ARMTraceChild::step() uint32_t lr = getRegVal(14); uint32_t pc = getPC(); - uint32_t lrOp; + uint32_t lrOp, subsOp; + char obuf[128]; + bool patch = false; // Since ARM uses software breakpoints behind the scenes, they don't work // in read only areas like the page of routines provided by the kernel. The // link register generally holds the address the process wants to the // kernel to return to after it's done, so we'll install a software - // breakpoint there. If the lr happens to point to the next instruction - // we'll leave out our breakpoint to avoid an infinite loop. This isn't a - // fool proof strategy, but it should work well in all the reasonable - // scenarios I can think of right now. + // breakpoint there. + // + // Calls into the kernel user page always follow the form: + // MVN ... + // <possible MOV lr,...> + // SUB PC, ... + // + // So we look for this pattern and set a breakpoint on the LR at the SUB + // instruction. - if (pc != lr) { + + subsOp = ptrace(PTRACE_PEEKDATA, pid, pc, 0); + if ((subsOp & 0xFFFF0FFF) == 0xe3e00a0f) + foundMvn = true; + + if (foundMvn && ((subsOp & 0xFFF0F000) == 0xe240f000)) { + foundMvn = false; lrOp = ptrace(PTRACE_PEEKDATA, pid, lr, 0); ptrace(PTRACE_POKEDATA, pid, lr, bkpt_inst); + patch = true; } ptraceSingleStep(); - if (pc != lr) { + + if (patch) ptrace(PTRACE_POKEDATA, pid, lr, lrOp); - } } diff --git a/util/statetrace/arch/tracechild_arm.hh b/util/statetrace/arch/tracechild_arm.hh index 9e1af6a8d..79eccd891 100644 --- a/util/statetrace/arch/tracechild_arm.hh +++ b/util/statetrace/arch/tracechild_arm.hh @@ -1,4 +1,16 @@ /* + * Copyright (c) 2010 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * * Copyright (c) 2009 The Regents of The University of Michigan * All rights reserved. * @@ -63,15 +75,16 @@ class ARMTraceChild : public TraceChild user_regs regs; user_regs oldregs; bool regDiffSinceUpdate[numregs]; - + bool foundMvn; + protected: bool update(int pid); - + public: ARMTraceChild(); bool sendState(int socket); - int getNumRegs() + int getNumRegs() { return numregs; } @@ -90,7 +103,7 @@ class ARMTraceChild : public TraceChild int64_t getRegVal(int num); int64_t getOldRegVal(int num); - + bool step(); uint64_t getPC() diff --git a/util/statetrace/statetrace.cc b/util/statetrace/statetrace.cc index e2762ac2c..d50c24f59 100644 --- a/util/statetrace/statetrace.cc +++ b/util/statetrace/statetrace.cc @@ -49,7 +49,13 @@ using namespace std; void printUsage(const char * execName) { - cout << execName << " -h | -r -- <command> <arguments>" << endl; + cout << execName << " <options> -- <command> <arguments>" << endl; + cout << "options:" << endl; + cout << " -h print this help" << endl; + cout << " --host remote m5 host to connect to" << endl; + cout << " -r print register names" << endl; + cout << " -i print initial stack state" << endl; + cout << " -nt don't print an instruction trace" << endl; } int main(int argc, char * argv[], char * envp[]) @@ -62,6 +68,11 @@ int main(int argc, char * argv[], char * envp[]) bool printInitial = false; bool printTrace = true; string host = "localhost"; + + if (argc == 1) { + printUsage(argv[0]); + return 0; + } for(int x = 1; x < argc; x++) { if(!strcmp(argv[x], "-h")) |