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H A Dverifier.cb14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
b14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
H A Dmain.hb14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
b14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
H A Djit.cb14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
b14157ee Mon Oct 23 13:58:13 CDT 2017 Jakub Kicinski <jakub.kicinski@netronome.com> nfp: bpf: support stack accesses via non-constant pointers

If stack pointer has a different value on different paths
but the alignment to words (4B) remains the same, we can
set a new LMEM access pointer to the calculated value and
access whichever word it's pointing to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>