_pt_metadata_t Struct Reference

#include <drpttracer_shared.h>

Data Fields
uint16_t	cpu_family
uint8_t	cpu_model
uint8_t	cpu_stepping
uint16_t	time_shift
uint32_t	time_mult
uint64_t	time_zero

Detailed Description

The type of PT trace's metadata.

Note

drpttracer uses the cpuid instruction to get the cpu_family, cpu_model and cpu_stepping. The cpu_family, cpu_model and cpu_stepping are used to initialize the PT config of pt2ir_t when decoding a PT trace.

drpttracer gets the time_shift, time_mult and time_zero from the opened perf event file's head. The time_shift, time_mult and time_zero are used to initialize the PT sideband config of pt2ir_t when decoding a PT trace.

All fields are little-endian.

Field Documentation

cpu_family

uint16_t _pt_metadata_t::cpu_family

The CPU family.

cpu_model

uint8_t _pt_metadata_t::cpu_model

The CPU mode.

cpu_stepping

uint8_t _pt_metadata_t::cpu_stepping

The CPU stepping.

time_mult

uint32_t _pt_metadata_t::time_mult

The time multiplier. pt2ir_t uses it to synchronize the time of the PT trace and sideband data.

Note

time_mult = perf_event_mmap_page.time_mult

time_shift

uint16_t _pt_metadata_t::time_shift

The time shift. pt2ir_t uses it to synchronize the time of the PT trace and sideband data.

Note

time_shift = perf_event_mmap_page.time_shift

time_zero

uint64_t _pt_metadata_t::time_zero

The time zero. pt2ir_t uses it to synchronize the time of the PT trace and sideband data.

Note

time_zero = perf_event_mmap_page.time_zero

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The documentation for this struct was generated from the following file:

• /home/runner/work/dynamorio/dynamorio/ext/drpttracer/drpttracer_shared.h