I need to debug a program that is being run on Gem5 (*NOT TO DEBUG GEM5 ITSELF*). For this goal, I was forced to use gdb remote. The code I want to debug was compiled using arm-linux cross compiler. In my host machine I installed all cross-tools required (gcc, g++ and gdb) to work with the ARM simulated machine in Gem5. From the host machine I started the gdb and typed the following commands:
gdb-multiarch file arm_test // a sample code compiled using arm-gcc cross compiler set architecture arm set b main target remote localhost:7000 c when I hit enter after typing c (cont) the program at Gem5 does not stop at main (as I set a breakpoint there) and it finishes its work, prints hello world and exits. At the Gem5 I saw a warn message says: warn: Invalid breakpoint length Strictly speaking, I think there is no harmony between the gdb running on my host and the program being executed on Gem5. Another thing... *Is the memory address offset for the code being debugged at host machine differ from the one being executed at gem5?* assume I want to modify the content of the code (binary instrumentation using gdb trap)... when I modify something (some byte) in the code and then type (cont) I get an error at gem5 (*even I rewrite the same byte*) panic: panic condition !handled occurred: Page table fault when accessing virtual address 0 Memory Usage: 703788 KBytes Program aborted at tick 4262000 --- BEGIN LIBC BACKTRACE --- ./build/ARM/gem5.opt(_Z15print_backtracev+0x2c)[0x55d827ea2d4c] ./build/ARM/gem5.opt(_Z12abortHandleri+0x4a)[0x55d827eb54ba] /lib/x86_64-linux-gnu/libpthread.so.0(+0x12980)[0x7fc89f802980] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7fc89e010fb7] /lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7fc89e012921] ./build/ARM/gem5.opt(+0xb5514f)[0x55d82672114f] ./build/ARM/gem5.opt(_ZN21GenericPageTableFault6invokeEP13ThreadContextRK14RefCountingPtrI10StaticInstE+0xc1)[0x55d827ef9831] ./build/ARM/gem5.opt(_ZN13BaseSimpleCPU9advancePCERKSt10shared_ptrI9FaultBaseE+0x173)[0x55d827fd5143] ./build/ARM/gem5.opt(_ZN15AtomicSimpleCPU4tickEv+0x465)[0x55d827fc78b5] ./build/ARM/gem5.opt(_ZN10EventQueue10serviceOneEv+0xa5)[0x55d827eab225] ./build/ARM/gem5.opt(_Z9doSimLoopP10EventQueue+0x87)[0x55d827ecff47] ./build/ARM/gem5.opt(_Z8simulatem+0xcba)[0x55d827ed0f9a] ./build/ARM/gem5.opt(+0x11982d1)[0x55d826d642d1] ./build/ARM/gem5.opt(+0xcfe011)[0x55d8268ca011] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x64d7)[0x7fc89faafc47] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fc89faaf366] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fc89faaf366] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fc89faaf366] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x19)[0x7fc89faa95d9] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x6ac0)[0x7fc89fab0230] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalFrameEx+0x5bf6)[0x7fc89faaf366] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCodeEx+0x7d8)[0x7fc89fbee908] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyEval_EvalCode+0x19)[0x7fc89faa95d9] /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0(PyRun_StringFlags+0x76)[0x7fc89fb596f6] ./build/ARM/gem5.opt(_Z6m5MainiPPc+0x83)[0x55d827eb3fb3] ./build/ARM/gem5.opt(main+0x38)[0x55d82669a0b8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7fc89dff3bf7] --- END LIBC BACKTRACE --- Aborted (core dumped) Any help or suggestions Thanks
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