src/sys/cddl/dev/dtrace/i386, 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: 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

dtrace: Add a "regs" variable

2022-10-04T17:05:54+00:00

This allows invop-based providers (i.e., fbt and kinst) to expose the
register file of the CPU at the point where the probe fired.  It does
not work for SDT providers because their probes are implemented as plain
function calls and so don't save registers.  It's not clear what
semantics "regs" should have for them anyway.

This is akin to "uregs", which nominally provides access to the
userspace registers.  In fact, DIF already had a DIF_VAR_REGS variable
defined, it was simply unimplemented.

Usage example: print the contents of %rdi upon each call to
amd64_syscall():

    fbt::amd64_syscall:entry {printf("%x", regs[R_RDI]);}

Note that the R_* constants are defined in /usr/lib/dtrace/regs_x86.d.
Currently there are no similar definitions for non-x86 platforms.

Reviewed by:	christos
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D36799

Fix syntax

2020-12-01T23:51:48+00:00

Add a kstack_contains() helper function.

2020-12-01T17:04:46+00:00

This is useful for stack unwinders which need to avoid out-of-bounds
reads of a kernel stack which can trigger kernel faults.

Reviewed by:	kib, markj
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D27356

Implement x86 dtrace_invop_(un)init() in C.

2019-09-23T15:08:17+00:00

There is no reason for these routines to be written in assembly.  In
the ports of DTrace to other platforms, they are already written in C.
No functional change intended.

MFC after:	1 week
Sponsored by:	Netflix