ARM: net: bpf: avoid 'bx' instruction on non-Thumb capable CPUs

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commit e906248182 upstream.

Avoid the 'bx' instruction on CPUs that have no support for Thumb and
thus do not implement this instruction by moving the generation of this
opcode to a separate function that selects between:

	bx	reg

and

	mov	pc, reg

according to the capabilities of the CPU.

Fixes: 39c13c204b ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Russell King 2018-01-13 11:35:15 +00:00 • committed by Greg Kroah-Hartman

parent 326efb49e1

commit 124047a81e

1 changed files with 11 additions and 7 deletions

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arch/arm/net/bpf_jit_32.c

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