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microwatt/scripts
Paul Mackerras 49a4d9f67a Add core logging
This logs 256 bits of data per cycle to a ring buffer in BRAM.  The
data collected can be read out through 2 new SPRs or through the
debug interface.

The new SPRs are LOG_ADDR (724) and LOG_DATA (725).  LOG_ADDR contains
the buffer write pointer in the upper 32 bits (in units of entries,
i.e. 32 bytes) and the read pointer in the lower 32 bits (in units of
doublewords, i.e. 8 bytes).  Reading LOG_DATA gives the doubleword
from the buffer at the read pointer and increments the read pointer.
Setting bit 31 of LOG_ADDR inhibits the trace log system from writing
to the log buffer, so the contents are stable and can be read.

There are two new debug addresses which function similarly to the
LOG_ADDR and LOG_DATA SPRs.  The log is frozen while either or both of
the LOG_ADDR SPR bit 31 or the debug LOG_ADDR register bit 31 are set.

The buffer defaults to 2048 entries, i.e. 64kB.  The size is set by
the LOG_LENGTH generic on the core_debug module.  Software can
determine the length of the buffer because the length is ORed into the
buffer write pointer in the upper 32 bits of LOG_ADDR.  Hence the
length of the buffer can be calculated as 1 << (31 - clz(LOG_ADDR)).

There is a program to format the log entries in a somewhat readable
fashion in scripts/fmt_log/fmt_log.c.  The log_entry struct in that
file describes the layout of the bits in the log entries.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
4 years ago
..
fmt_log Add core logging 4 years ago
mw_debug Add core logging 4 years ago
bin2hex.py bin2hex: Make sure to generate little endian files 4 years ago
dependencies.py Improve dependencies.py and add a --synth option 5 years ago
gen_icache_tb.py icache_tb: Improve test and include test file 5 years ago
run_test.sh Dump CTR, LR and CR on sim termination, and update our tests 5 years ago
run_test_console.sh Add test cases for new exceptions and supervisor state 5 years ago
test_micropython.py Update micropython 5 years ago
test_micropython_long.py Update micropython 5 years ago
vhdltags Add VHDL TAGS 5 years ago