src/sys/cddl/contrib/opensolaris/uts/intel, branch main

vm: Remove kernel stack swapping support, part 3

2024-07-29T01:39:49+00:00

- Modify PHOLD() to no longer fault in the process.
- Remove _PHOLD_LITE(), which is now the same as _PHOLD(), fix up
  consumers.
- Remove faultin() and its callees.

Tested by:	pho
Reviewed by:	imp, kib
Differential Revision:	https://reviews.freebsd.org/D46114

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

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

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

fasttrap: Avoid creating WX mappings

2022-03-01T17:40:35+00:00

fasttrap instruments certain instructions by overwriting them and
copying the original instruction to some per-thread scratch space which
is executed after the probe fires.  This trampoline jumps back to the
tracepoint after executing the original instruction.

The created mapping has both write and execute permissions, and so this
mechanism doesn't work when allow_wx is disabled.  Work around the
restriction by using proc_rwmem() to write to the trampoline.

Reviewed by:	vangyzen
Tested by:	Amit 
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34304

Create sys/reg.h for the common code previously in machine/reg.h

2021-08-30T11:50:53+00:00

Move the common kernel function signatures from machine/reg.h to a new
sys/reg.h. This is in preperation for adding PT_GETREGSET to ptrace(2).

Reviewed by:	imp, markj
Sponsored by:	DARPA, AFRL (original work)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19830

amd64: move GDT into PCPU area.

2019-11-12T15:51:47+00:00

Reviewed by:	jhb, markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D22302

Fix fasttrap_sig{trap,segv}().

2019-02-26T18:20:41+00:00

- Don't leak the ksiginfo structure.
- Hold the proc lock when sending a signal in fasttrap_sigsegv().

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

Remove illumos-specific code from the x86 fasttrap_isa.c.

2019-02-26T16:34:43+00:00

The file has not been touched upstream in over a decade, and the nature
of the code means that a lot of FreeBSD-specific bits are required.  Remove
the dead code to improve readability.  No functional change intended.

Discussed with:	cem
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

Commit a missing piece of r344452.

2019-02-21T22:56:54+00:00

MFC with:	r344452

Fix a tracepoint lookup race in fasttrap_pid_probe().

2019-02-21T22:54:17+00:00

fasttrap hooks the userspace breakpoint handler; the hook looks up the
breakpoint address in a hash table of tracepoints.  It is possible for
the tracepoint to be removed by a different thread in between the
breakpoint trap and the hash table lookup, in which case SIGTRAP gets
delivered to the target process.  Fix the problem by adding a
per-process generation counter that gets incremented when a tracepoint
belonging to that process is removed.  Then, when a lookup fails, the
trapping instruction is restarted if the thread's counter doesn't match
that of the process.

Reviewed by:	cem
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19273

Remove very old and unused signal information codes.

2018-03-27T20:57:51+00:00

These have been supplanted by the MI signal information codes in
 since 7.0.  The FPE_*_TRAP ones were deprecated even
earlier in 1999.

PR:		226579 (exp-run)
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D14637