commit | 9de4dfbe245781ed20a34fc7327320f1f358e599 | [log] [tgz] |
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author | Abhinav Anil Sharma <sharmaabhinav@google.com> | Thu May 13 15:25:00 2021 |
committer | GitHub <noreply@github.com> | Thu May 13 15:25:00 2021 |
tree | 25855c0ce9cff1c143b96effd5ea431f657087c1 | |
parent | 9cb7aaf662781bfb36de77be4288ac6cd65ca947 [diff] |
i#2985 scatter-gather: Fix scratch mask restoration on fault during scatter (#4909) Adds a missing state transition in drx_avx512_scatter_sequence_state_machine used in drx_event_restore_state. This was causing restoration of the wrong value to scratch mask k0, resulting in a "ERROR: expected k0 == 0xffff, but is 0xd360" error in the drx-scattergather app. Postpones updating trace buffer ptr in the memval_simple sample client to post-write. This is to mitigate cases when the write buffer doesn't get written to due to the app write segfaulting, which results in no matching entry in the write buffer for the trace buffer entry. This causes an assert failure later for "write_base <= write_ptr" in trace_fault. A more efficient solution would be to handle this rare app-write-fail corner case in a fault handler instead. But we skip adding additional complexity in this sample client. Added an XXX comment for now. Adds a test that runs the drx-scattergather app under the memval_simple client to verify the above two fixes. Enables client.memval-test on 64-bit Linux. Issue: #2985
DynamoRIO is a runtime code manipulation system that supports code transformations on any part of a program, while it executes. DynamoRIO exports an interface for building dynamic tools for a wide variety of uses: program analysis and understanding, profiling, instrumentation, optimization, translation, etc. Unlike many dynamic tool systems, DynamoRIO is not limited to insertion of callouts/trampolines and allows arbitrary modifications to application instructions via a powerful IA-32/AMD64/ARM/AArch64 instruction manipulation library. DynamoRIO provides efficient, transparent, and comprehensive manipulation of unmodified applications running on stock operating systems (Windows, Linux, or Android) and commodity IA-32, AMD64, ARM, and AArch64 hardware. Mac OSX support is in progress.
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