MIPS: microMIPS: Fix decoding of swsp16 instruction

When the immediate encoded in the instruction is accessed, it is sign
extended due to being a signed value being assigned to a signed integer.
The ISA specifies that this operation is an unsigned operation.
The sign extension leads us to incorrectly decode:

801e9c8e:       cbf1            sw      ra,68(sp)

As having an immediate of 1073741809.

Since the instruction format does not specify signed/unsigned, and this
is currently the only location to use this instuction format, change it
to an unsigned immediate.

Fixes: bb9bc4689b9c ("MIPS: Calculate microMIPS ra properly when unwinding the stack")
Suggested-by: Paul Burton <[email protected]>
Signed-off-by: Matt Redfearn <[email protected]>
Reviewed-by: James Hogan <[email protected]>
Cc: Marcin Nowakowski <[email protected]>
Cc: Miodrag Dinic <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: David Daney <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/16957/
Signed-off-by: Ralf Baechle <[email protected]>

0 files changed, 0 insertions, 0 deletions