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opnsense-src/sys/arm64/include
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Andrew Turner e340882d3e arm64: Add BTI landing pads to assembly functions 
When we enable BTI iboth the first instruction in a function that could
be called indirectly, and a branch within a function need a valid
landing pad instruction.

There are three options for these instructions:
 1. A breakpoint instruction
 2. A pointer authentication PACIASP/PACIBSP
 3. A BTI instruction

Option 1 will raise a breakpoint exception so isn't useable in either
cases. Option 2 could be used in some function entry cases, but needs
to be paired with an authentication instruction, and is normally only
used in non-leaf functions we can't use it in this case. This leaves
option 3.

There are four variants of the instruction, the C variant is used on
function entry and the J variant is for jumping within a function.
There is also a JC that works with both and one with no target that
works with neither.

Reviewed by:	markj
Sponsored by:	Arm Ltd
Sponsored by:	The FreeBSD Foundation (earlier version)
Differential Revision:	https://reviews.freebsd.org/D42078
2023-10-10 10:52:16 +01:00
..
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armreg.h Add BTI exceptions 2023-09-22 18:15:14 +01:00
asan.h spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD 2023-05-12 10:44:03 -06:00
asm.h arm64: Add BTI landing pads to assembly functions 2023-10-10 10:52:16 +01:00
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pmap.h add pmap_active_cpus() 2023-08-23 03:02:21 +03:00
pmc_mdep.h pmc: better distinguish pmu-events allocation path 2023-09-03 13:27:21 -07:00
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