On Tue, 14 Dec 2021 at 10:58, Pavel Labath via lldb-dev
<lldb-dev@lists.llvm.org> wrote:
>
> So how would this be represented in lldb? Would there be any threads,
> registers? Just a process with a bunch of modules ?
Using GDB (kgdb) as an example - it lists a thread for every
kernel/userspace thread. For example,
...
593 Thread 100691 (PID=20798: sleep)
sched_switch (td=0xfffffe0118579100, flags=<optimized out>)
at /usr/home/emaste/src/freebsd-git/laptop/sys/kern/sched_ule.c:2147
...
and it can fetch per-thread register state:
(kgdb) thread 593
[Switching to thread 593 (Thread 100691)]
#0 sched_switch (td=0xfffffe0118579100, flags=<optimized out>) at
/usr/home/emaste/src/freebsd-git/laptop/sys/kern/sched_ule.c:2147
2147 cpuid = td->td_oncpu = PCPU_GET(cpuid);
(kgdb) info reg
rax <unavailable>
rbx 0x882c545e 2284606558
rcx <unavailable>
rdx <unavailable>
rsi <unavailable>
rdi <unavailable>
rbp 0xfffffe01172617d0 0xfffffe01172617d0
rsp 0xfffffe0117261708 0xfffffe0117261708
....
(kgdb) bt
#0 sched_switch (td=0xfffffe0118579100, flags=<optimized out>) at
/usr/home/emaste/src/freebsd-git/laptop/sys/kern/sched_ule.c:2147
#1 0xffffffff80ba4261 in mi_switch (flags=flags@entry=260) at
/usr/home/emaste/src/freebsd-git/laptop/sys/kern/kern_synch.c:542
#2 0xffffffff80bf428e in sleepq_switch
(wchan=wchan@entry=0xffffffff81c8db21 <nanowait+1>, pri=pri@entry=108)
at /usr/home/emaste/src/freebsd-git/laptop/sys/kern/subr_sleepqueue.c:608
...
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