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Morello instruction tracing nops #257

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Morello instruction tracing nops #257

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Commits on Jul 8, 2024

  1. Fix mismerge that breaks instruction tracing. 

    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.
    @qwattash
    qwattash committed Jul 8, 2024
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  2. Introduce tracing nops for aarch64. 

    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 committed Jul 8, 2024
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