Listens on a configurable SUT's global variable.
On read access a signal pattern value is calculated and sent back
to the SUT.
Currently, only a superimposable sine wave signal form is implemented.
Further signal forms can be implemented by inheriting from the
abstract SignalForm class.
Change-Id: I2e6cf49cd44797999691c9e9cf0c54dd3c96875e
Logs access to a given global variable of the SUT, given by
a symbol name, and outputs value when variable is written to file.
Format:
<Simulation time>;<Value of variable>
Change-Id: I81b581e571be4255a1a2200c41e7c16657ddfd3d
Add two new breakpoints to L4Sys experiment that allow detecting that
execution terminated with an error: vga_console_blink() is called by the
kernel if JDB was entered (meaning we are hanging, e.g., due to an
assertion); also longjmp() is only used by PF handling code after no
valid page fault handling could be performed
Change-Id: Ice61039c4bd07815a316bbc0bdb39f3483d9a1da
* after injecting a fault, track how many instructions it takes until
execution deviates from original execution
* also track what the first deviating EIP value is
Change-Id: I18a9250517ca90214728c2c4b036b412f5dbf224
When a register in the extended trace was dereferenced and the value
was smaller than the memory pool size, but the address was not mapped
an assertion occured and the tracing plugin terminated the
simulator. Now the dereferenced memory address is checked for being
mapped and not being smaller than the memory pool.
Change-Id: I9ac954988ef860969679f9f360814c5e4b66f473
The ElfImporter is not a real trace importer, but we locate it
into the import-trace utility, since here the infrastructure is
already in place to import things related to an elf binary into
the database.
The ElfImporter calls objdump and dissassembles an elf binary
and imports the results into the database.
Change-Id: I6e35673c8dbee3b7e8dfc7549d10e5dca9b55935
* introduce L4SYS_ADDRESS_SPACE_TRACE to indicate that we want
to trace instructions in a different AS from the one we are starting
the experiment in
* add CR3Run() to determine address space ID
Change-Id: I7bdaf1e858a6dd369af5175bd56e1b4e2d5f05ef
The internal m_iponly / m_memonly bools are a bit hackish; especially it's
unclear what should happen if both are set. The m_tracetype enum now
encompasses all possible configurations, while the plugin's user interface
remains unchanged.
Change-Id: Ibdd872b5cc5781836428b27bfb2db3825700e671
This change implements what the source-code comment already promised but
didn't keep: As we only record time deltas instead of absolute time values,
prevtime must not be overwritten unless the current delta was really added
to the trace. This has caused timing information to be stored incorrectly
if certain events were skipped (e.g., because they didn't match the memory
map configured by the user).
Change-Id: Id40271d117dd91b1122136c62329d64174f304b0
Richard noticed that instr2 values are off by one when done with the
MemoryImporter vs. with his own importer. The core problem is that
the dynamic instruction counter in the Importer base class
(Importer::copy_to_database, instruction_count_t instr) gets increased
*after* reporting an IP event to the importer implementation; this has
the side-effect that memory access events have a +1 dynamic
instruction count offset with regard to the IP event of the
instruction they belong to.
Bottom line: IP events and all memory events belonging to that
instruction should have the same dynamic instruction number.
Christian argued for the numbers starting with 0, which, as a side
effect, relativizes the repercussions of the change introduced in the
previous commit, as the new "first" event gets the sequence number 0
now.
- All experiments and importers only dealing with memory accesses
(MemoryImporter) are affected by this change: The dynamic
instruction count now starts with 0 instead of 1. Together with
the previous commit, the only change is one additional dynamic
instruction at position 0. Note that existing trace files do not
have this additional instruction, which shifts all trace positions
by 1.
- All importers that process *only* IP events (InstructionImporter,
RandomJumpImporter, RegisterImporter) won't see any difference.
Commit 036e340, though, introduced a +1 offset.
- Experiments that use these instruction counts for navigating to
the target instruction must be checked to properly deal with the
dynamic instruction #0 (no forwarding necessary). All dynamic
instruction offsetting should now work uniformly for both memory
accesses and all other fault models. To be sure everything works
in order, sanity-check the current absolute instruction pointer
right before fault injection.
Change-Id: I3f509f1b47836fa78fd029a7bb7c36c878912d97
When starting the tracing plugin (simulator.addFlow()), at the moment
the *current* dynamic instruction (e.g., the one the start symbol
points to) is skipped, and tracing commences with the second
instruction. This change records an additional instruction event at
the trace begin.
Note that this change affects all tracing-plugin users. The first
event gets recorded when starting the plugin (simulator.addFlow()).
This avoids compatibility/off-by-one issues when recording traces with
the generic-tracing experiment vs. with custom experiments.
Change-Id: Ic24e17a68b8a44edad3be994e9edd6d6712bfda1
This reverts commit 036e340bd9.
Problems with this one were:
- Broken event timings. m_prevtime wasn't reset to m_curtime in
TracingPlugin::handleSingleIP(), resulting in a large deltatime
being recorded for the second event, too. This effectively
doubled the experiment's start time.
- Code repetition (copy/pasted for special handling of first event),
making planned changes (advanced tracing for IP events) more
difficult.
- Unnecessary additional tracing-plugin interface method.
Change-Id: I4b74d1a3f4563aabe6626399f9b30a2171b4c285
Without this change, import-trace won't recognize, e.g., the -e and -t
parameters if they come after a parameter that was added by the Importer:
import-trace -i objdump --objdump arm-none-eabi-objdump -e B.elf -t C.tc
[...]
[import-trace 14:37:32] couldn't open trace.pb
Change-Id: I9532b01e432055479c79d801b1ca2736a8fd21cc
When using the generic-tracing experiment for generating a trace, the
first event, after the tracing is started (the start-symbol) is lost
in the trace. This patch handles this special case seperately.
Change-Id: Ia131a8559d67161532504160826fdb100247ed75
Call this script from a build directory to setup
a build environment for FailBochs pruning.
Usage:
<path to fail>/configurations/x86_pruning.sh <Experiment name>
Change-Id: I778a20c258dcd5349c3da9e1c5a8542af43f61d5
* Fowler's Law of Refactoring: Have test cases available.
* BjoernD's Corollary to Fowler's Law: Use these tests!
Change-Id: I3d3e48ffe08209891c6204655323cd26a0eaaebd
The experiment does support
- 1 bit faults in registers/memory/IP
- 2 bit faults in registers (all)
- n bit faults monte-carlo in registers
Change-Id: Ifdd7df6ec4bc88cfc75391b5e19e0d648fd0d087
The RegisterImporter splits each register into 1 byte chunks. The
--do-not-split flag prohibits this splitting. Be aware, that def/use
pruning won't work correctly in mixed-width cases (EAX/AX/AH/AL).
Change-Id: Ifa1930bdd9f317a6fd3ae50c4ff3cffc97504640
During the prune step the data_width of the injected location was not
propagated before. It is now stored in fsppilot (database layout change!) and
sent in the fsppilot protobuf message.
Change-Id: I0562f6fc8957adea0f8a9fb63469ca5e3f4b7b2d
