dtrace/amd64: Make invop providers usable with KMSAN enabled

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

MFC after: 2 w

dtrace/amd64: Make invop providers usable with KMSAN enabled

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

MFC after: 2 weeks

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dtrace/amd64: Remove the dtrace_invop_callsite symbol

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

Reviewed by: avg
MFC after: 2 weeks
Differential Revision: https://

dtrace/amd64: Remove the dtrace_invop_callsite symbol

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

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

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

dtrace/amd64: Implement emulation of call instructions

Here, the provider is responsible for updating the trapframe to redirect
control flow and for computing the return address. Once software-save

dtrace/amd64: Implement emulation of call instructions

Here, the provider is responsible for updating the trapframe to redirect
control flow and for computing the return address. Once software-saved
registers are restored, the emulation shifts the remaining context down
on the stack to make space for the return address, then copies the
address provided by the invop handler. dtrace_invop() is modified to
allocate temporary storage space on the stack for use by the provider to
return the return address.

This is to support a new provider for amd64 which can instrument
arbitrary instructions, not just function entry and exit instructions as
FBT does.

In collaboration with: christos
Sponsored by: Google, Inc. (GSoC 2022)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

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x86: remove gcov kernel support

Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D29529

Merge ^/head r352587 through r352763.

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

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

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

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

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dtrace: fix userspace access on boxes with SMAP

dtrace has its own routines which were not updated after SMAP support got
implemented. Use ifunc just like for other routines.

This in particular fix

dtrace: fix userspace access on boxes with SMAP

dtrace has its own routines which were not updated after SMAP support got
implemented. Use ifunc just like for other routines.

This in particular fixes ustack().

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D18542

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Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundati

Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14180

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Make the second argument of dtrace_invop() a trapframe pointer.

Currently this argument is a pointer into the stack which is used by FBT
to fetch the first five probe arguments. On all non-x86 archi

Make the second argument of dtrace_invop() a trapframe pointer.

Currently this argument is a pointer into the stack which is used by FBT
to fetch the first five probe arguments. On all non-x86 architectures it's
simply the trapframe address, so this change has no functional impact. On
amd64 it's a pointer into the trapframe such that stack[1 .. 5] gives the
first five argument registers, which are deliberately grouped together in
the amd64 trapframe definition.

A trapframe argument simplifies the invop handlers on !x86 and makes the
x86 FBT invop handler easier to understand. Moreover, it allows for invop
handlers that may want to modify the register set of the interrupted thread.

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Catch up with HEAD (r280229-r284686).

MFH: r282615-r283655

Sponsored by: The FreeBSD Foundation

Merge sync of head

Remove unused references to calltrap.

MFC after: 3 days

Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation

Fix DTrace's panic() action.

It would previously call into some unfinished Solaris compatibility code and
return without actually calling panic(9). The compatibility code is
unneeded, however, so ju

Fix DTrace's panic() action.

It would previously call into some unfinished Solaris compatibility code and
return without actually calling panic(9). The compatibility code is
unneeded, however, so just remove it and have dtrace_panic() call vpanic(9)
directly.

Differential Revision: https://reviews.freebsd.org/D2349
Reviewed by: avg
MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

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Custom DTrace kernel module files plus FreeBSD-specific DTrace providers.

Custom DTrace kernel module files plus FreeBSD-specific DTrace providers.