]> git.baikalelectronics.ru Git - kernel.git/commit
arm64: BTI: Decode BYTPE bits when printing PSTATE
authorDave Martin <Dave.Martin@arm.com>
Mon, 16 Mar 2020 16:50:48 +0000 (16:50 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Mon, 16 Mar 2020 17:19:49 +0000 (17:19 +0000)
commit91f748593787d9c2f947977a02f553be7a036b60
treeb3bc62ff2f4ac7d790d2aa49351795765d86e441
parent7f670c8b6a0a85daac09dfad5dbfff2bf3f260a0
arm64: BTI: Decode BYTPE bits when printing PSTATE

The current code to print PSTATE symbolically when generating
backtraces etc., does not include the BYTPE field used by Branch
Target Identification.

So, decode BYTPE and print it too.

In the interests of human-readability, print the classes of BTI
matched.  The symbolic notation, BYTPE (PSTATE[11:10]) and
permitted classes of subsequent instruction are:

    -- (BTYPE=0b00): any insn
    jc (BTYPE=0b01): BTI jc, BTI j, BTI c, PACIxSP
    -c (BYTPE=0b10): BTI jc, BTI c, PACIxSP
    j- (BTYPE=0b11): BTI jc, BTI j

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/kernel/process.c