dynamic: Refactor logic to perform multiple updates #1702
Commits on Mar 11, 2024
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dynamic: Load dynamic info only once
This is in preparation of runtime dynamic patching. This commit guarantees that dynamic info is read only once for the target binary and for each module. Co-authored-by: Gabriel-Andrew Pollo-Guilbert <gabrielpolloguilbert@gmail.com> Signed-off-by: Clément Guidi <cguidi@ciena.com> Signed-off-by: Seyed-Vahid Azhari <vazhari@ciena.com>
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dynamic: Initialize size filter only once
If 'mcount_dynamic_update' is called multiple times (e.g. at runtime), it initializes the size filter only once. Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: arch: Initialize disassembly engine once
Skip the initialization of the disassembly engine with it has already been performed. Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: Archive pattern list after update
After patching, clear the pattern list for reuse. However, archive its content in a separate aggregated list. This list contains all applied patterns and is used applied again when when opening a dynamic library. Co-authored-by: Gabriel-Andrew Pollo-Guilbert <gabrielpolloguilbert@gmail.com> Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: Refactor 'mcount_dynamic_update'
The 'mcount_dynamic_update' is now safe to call multiple times, including at runtime. On each call, it will perform patching and unpatching of the target (not implemented yet). Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: Streamline trampoline life cycle
Install a trampoline for each loaded module map, on initialization. Keep the trampolines in memory to allow for dynamic patching at runtime. Clear the trampolines on libmcount exit. Co-authored-by: Gabriel-Andrew Pollo-Guilbert <gabrielpolloguilbert@gmail.com> Signed-off-by: Clément Guidi <cguidi@ciena.com>
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mcount: Use flag to indicate if target is running
Use a global flag to indicate the state of the target. When the target is not running, tasks such as dynamic patching can be performed with less constraints. If libmcount.so is dynamically injected (not implemented yet), the 'mcount_target_running' flag indicates that libmcount has to be initialized in a running target. Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: Init arch-specific structures
Trigger architecture specific dynamic initialization when initializing the dynamic instrumentation mechanics. Co-authored-by: Gabriel-Andrew Pollo-Guilbert <gabrielpolloguilbert@gmail.com> Signed-off-by: Clément Guidi <cguidi@ciena.com>
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dynamic: Save original instructions only once
Don't save instructions if they are already present in the code hmap. Signed-off-by: Clément Guidi <cguidi@ciena.com>
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