src/sys/cddl/dev/dtrace/powerpc, 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

sys: Remove ancient SCCS tags.

2023-11-27T05:23:30+00:00

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by:		Netflix

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

2023-08-16T17:54:18+00:00

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

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/powerpc: Remove accidental commented out line

2023-03-13T15:37:40+00:00

Fixes:	3e1155ade1b

dtrace/powerpc: "Fix" stack traces across trap frames

2023-03-11T16:35:27+00:00

In function boundary tracing the link register is not yet saved to the
save stack location, so the save point contains whatever the previous
'lr' save was, or even garbage, at the time the trap is taken.  Address
this by explicitly loading the link register from the trap frame instead
of the stack, and propagate that out.

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

Adjust function definition in powerpc's dtrace_subr.c to avoid clang 15 warning

2022-08-14T19:27:34+00:00

With clang 15, the following -Werror warning is produced:

    sys/cddl/dev/dtrace/powerpc/dtrace_subr.c:237:17: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
    dtrace_gethrtime()
                    ^
                     void

This is because dtrace_gethrtime() is declared with a (void) argument
list, but defined with an empty argument list. Make the definition match
the declaration.

MFC after:	3 days