powerpc sstep: Add support for extswsli instruction

This adds emulation support for the following integer instructions:
  * Extend-Sign Word and Shift Left Immediate (extswsli[.])

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 94189da4c159..742298bdf30b 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1935,6 +1935,20 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
                                 op->xerval &= ~XER_CA;
                         set_ca32(op, op->xerval & XER_CA);
                         goto logical_done;
+
+                case 890:       /* extswsli with sh_5 = 0 */
+                case 891:       /* extswsli with sh_5 = 1 */
+                        if (!cpu_has_feature(CPU_FTR_ARCH_300))
+                                return -1;
+                        op->type = COMPUTE + SETREG;
+                        sh = rb | ((instr & 2) << 4);
+                        val = (signed int) regs->gpr[rd];
+                        if (sh)
+                                op->val = ROTATE(val, sh) & MASK64(0, 63 - sh);
+                        else
+                                op->val = val;
+                        goto logical_done;
+
 #endif /* __powerpc64__ */
 
 /*