Some analysis greatly benefits, or depends on, information about interrupts. For example, we may need to handle the execution of a new translation block differently if it is not the result of normal program flow but of an interrupt.
Even with the existing interfaces, it is more or less possible to discern these situations, e.g. as done by the cflow plugin. However, this process poses a considerable overhead to the core analysis one may intend to perform. These changes introduce a generic and easy-to-use interface for plugin authors in the form of callbacks for different types of traps. Patch 1 defines the callback registration functions and supplies a somewhat narrow definition of the event the callbacks are called. Patch 2 adds some hooks for triggering the callbacks. Patch 3 adds an example plugin showcasing the new API. The remaining patches call the hooks for a selection of architectures, mapping architecture specific events to the three categories defined in patch 1. Future non-RFC patchsets will call these hooks for all architectures (that have some concept of trap or interrupt). Sidenote: I'm likely doing something wrong for one architecture or the other. For example, with the old version Alex Bennée suggested registering a helper function with arm_register_el_change_hook() for arm, which is not what I ended up doing. And for AVR my approach to just assume only (asynchroneous) interrupts exist is also likely too naïve. Since v1: - Split the one callback into multiple callbacks - Added a target-agnostic definition of the relevant event(s) - Call hooks from architecture-code rather than accel/tcg/cpu-exec.c - Added a plugin showcasing API usage Julian Ganz (7): plugins: add API for registering trap related callbacks plugins: add hooks for new trap related callbacks contrib/plugins: add plugin showcasing new trap related API target/arm: call plugin trap callbacks target/avr: call plugin trap callbacks target/riscv: call plugin trap callbacks target/sparc: call plugin trap callbacks contrib/plugins/Makefile | 1 + contrib/plugins/traps.c | 89 ++++++++++++++++++++++++++++++++++++ include/qemu/plugin-event.h | 3 ++ include/qemu/plugin.h | 12 +++++ include/qemu/qemu-plugin.h | 45 ++++++++++++++++++ plugins/core.c | 42 +++++++++++++++++ plugins/qemu-plugins.symbols | 3 ++ target/arm/helper.c | 23 ++++++++++ target/avr/helper.c | 3 ++ target/riscv/cpu_helper.c | 8 ++++ target/sparc/int32_helper.c | 7 +++ target/sparc/int64_helper.c | 10 ++++ 12 files changed, 246 insertions(+) create mode 100644 contrib/plugins/traps.c -- 2.45.2
