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Diffstat (limited to 'Documentation/trace/coresight/coresight-etm4x-reference.rst')
| -rw-r--r-- | Documentation/trace/coresight/coresight-etm4x-reference.rst | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/Documentation/trace/coresight/coresight-etm4x-reference.rst b/Documentation/trace/coresight/coresight-etm4x-reference.rst index d25dfe86af9b..89ac4e6fc96f 100644 --- a/Documentation/trace/coresight/coresight-etm4x-reference.rst +++ b/Documentation/trace/coresight/coresight-etm4x-reference.rst @@ -71,6 +71,20 @@ the ‘TRC’ prefix. ---- +:File: ``ts_source`` (ro) +:Trace Registers: None. +:Notes: + When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace session. Otherwise -1 + indicates an unknown time source. Check trcidr0.tssize to see if a global timestamp is + available. + +:Example: + ``$> cat ts_source`` + + ``$> 1`` + +---- + :File: ``addr_idx`` (rw) :Trace Registers: None. :Notes: @@ -650,13 +664,26 @@ Bit assignments shown below:- parameter is set this value is applied to the currently indexed address range. +.. _coresight-branch-broadcast: **bit (4):** ETM_MODE_BB **description:** - Set to enable branch broadcast if supported in hardware [IDR0]. + Set to enable branch broadcast if supported in hardware [IDR0]. The primary use for this feature + is when code is patched dynamically at run time and the full program flow may not be able to be + reconstructed using only conditional branches. + + There is currently no support in Perf for supplying modified binaries to the decoder, so this + feature is only intended to be used for debugging purposes or with a 3rd party tool. + + Choosing this option will result in a significant increase in the amount of trace generated - + possible danger of overflows, or fewer instructions covered. Note, that this option also + overrides any setting of :ref:`ETM_MODE_RETURNSTACK <coresight-return-stack>`, so where a branch + broadcast range overlaps a return stack range, return stacks will not be available for that + range. +.. _coresight-cycle-accurate: **bit (5):** ETMv4_MODE_CYCACC @@ -678,6 +705,7 @@ Bit assignments shown below:- **description:** Set to enable virtual machine ID tracing if supported [IDR2]. +.. _coresight-timestamp: **bit (11):** ETMv4_MODE_TIMESTAMP @@ -685,6 +713,7 @@ Bit assignments shown below:- **description:** Set to enable timestamp generation if supported [IDR0]. +.. _coresight-return-stack: **bit (12):** ETM_MODE_RETURNSTACK |