src/sys/cddl/dev/dtrace/amd64, branch main

dtrace: Deduplicate dtrace_sync() and dtrace_xcall() implementations

2025-09-18T22:09:49+00:00

dtrace_xcall() is just a thin wrapper around smp_rendezvous_cpus().
There's no need for six identical implementations to live in MD layers.

No functional change intended.

MFC after:	2 weeks

dtrace: Add some more annotations for KMSAN

2024-11-23T02:36:08+00:00

- Don't allow FBT and kinst to instrument the KMSAN runtime.
- When fetching data from the traced thread's stack, mark it as
  initialized.  It may well be uninitialized, but as dtrace permits
  arbitrary inspection of kernel memory, it isn't very useful to raise
  KMSAN reports.
- Mark data copied in from userspace as initialized, as we do for
  copyin() etc. using interceptors.

MFC after:	2 weeks

dtrace/amd64: Make invop providers usable with KMSAN enabled

2024-11-22T14:03:40+00:00

- Use a fresh context when entering dtrace_invop() via a breakpoint
  exception.
- Mark the #BP trapframe as initialized.

MFC after:	2 weeks

dtrace/amd64: Remove the dtrace_invop_callsite symbol

2024-09-19T09:22:13+00:00

It is not needed after commit 7e80fd5ef397.  No functional change
intended.

Reviewed by:	avg
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D46675

dtrace/amd64: Fix probe argument fetching

2024-09-19T09:21:38+00:00

dtrace_getarg() previously walked the call stack looking for a frame
matching the dtrace_invop_callsite symbol, in order to look for a
trapframe corresponding to an invop (i.e., FBT or kinst) probe.  Commit
3ba8e9dc4a0e broke this in some cases by breaking the expected alignment
of the dtrace_invop_callsite symbol.

Rather than groveling around the stack to find invop probe arguments,
simply use the trapframe reference saved by dtrace_invop().  This is
simpler and less fragile.

Reported by:	avg
Reviewed by:	avg
MFC after:	2 weeks
Fixes:	3ba8e9dc4a0e ("dtrace/amd64: Implement emulation of call instructions")
Differential Revision:	https://reviews.freebsd.org/D46672

dtrace: Avoid including dtrace_isa.c directly into dtrace.c

2024-07-24T21:24:46+00:00

This was done in the original DTrace import, presumably because that
made it a bit easier to handle includes.  However, this can cause
dtrace_getpcstack() to be inlined into dtrace_probe(), resulting in a
missing frame in stack traces since dtrace_getpcstack() takes care to
bump "aframes" to account for its own stack frame.

To avoid this, compile dtrace_isa.c separately on all platforms.  Add
requisite includes.

MFC after:	2 weeks
Sponsored by:	Innovate UK

dtrace: remove x86 non-EARLY_AP_STARTUP support

2023-10-10T15:03:27+00:00

After 792655abd64c EARLY_AP_STARTUP is mandatory for x86.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D42139

sys: Remove $FreeBSD$: two-line .h pattern

2023-08-16T17:54:11+00:00

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

dtrace: rename rp to frame in dtrace_getreg()

2023-05-23T14:44:47+00:00

Reviewed by:	mhorne, markj
Approved by:	markj (mentor)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D40231

dtrace: get rid of uchar_t types

2023-04-20T17:35:56+00:00

Callers are specifying uint8_t anyway and this slightly reduces
dependencies on compatibility typedefs.  No functional change intended.

Reviewed by:	markj, mhorne
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D39490