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Morello instruction tracing nops #257

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@qwattash qwattash commented Jul 8, 2024

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@qwattash qwattash requested review from jrtc27 and arichardson July 8, 2024 16:57
qwattash added 2 commits July 8, 2024 17:59
A previous merge moved the tcg cflags logic to the tcg_cpu_init_cflags
function. This is only called when a vcpu is started to precompute
cflags. In order to ensure that TB cflags are compared correctly,
curr_cflags must set CF_LOG_INSTR dynamically.
Use the hlt instruction with a custom set of immediates to issue
tracing commands. This mirrors the behaviour of the ARM FVP Tarmac
trace plugin, which uses the hlt instruction with configurable
immediate values to start and stop tracing.

Introduce the following hlt immediates:
 - 0xff00: start instruction tracing
 - 0xff01: stop instruction tracing
 - 0xff02: start user-mode instruction tracing
@qwattash qwattash force-pushed the morello-instr-tracing-nops branch from 4dae948 to 6f6f935 Compare July 8, 2024 17:00
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Not checked whether these conflict with anything but change LGTM.

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