[PATCH 2/3] powerpc sstep: add support for divde[.] and divdeu[.] instructions

[Balamuruhan S]

This patch adds emulation support for divde, divdeu instructions,
        * Divide Doubleword Extended (divde[.])
        * Divide Doubleword Extended Unsigned (divdeu[.])

Signed-off-by: Balamuruhan S <bal...@linux.ibm.com>
---
 arch/powerpc/lib/sstep.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index c077acb983a1..4b4119729e59 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1736,7 +1736,32 @@ int analyse_instr(struct instruction_op *op, const 
struct pt_regs *regs,
                        op->val = (int) regs->gpr[ra] /
                                (int) regs->gpr[rb];
                        goto arith_done;
-
+#ifdef __powerpc64__
+               case 425:       /* divde[.] */
+                       if (instr & 1) {
+                               asm volatile(PPC_DIVDE_DOT(%0, %1, %2) :
+                                       "=r" (op->val) : "r" (regs->gpr[ra]),
+                                       "r" (regs->gpr[rb]));
+                               set_cr0(regs, op);
+                       } else {
+                               asm volatile(PPC_DIVDE(%0, %1, %2) :
+                                       "=r" (op->val) : "r" (regs->gpr[ra]),
+                                       "r" (regs->gpr[rb]));
+                       }
+                       goto compute_done;
+               case 393:       /* divdeu[.] */
+                       if (instr & 1) {
+                               asm volatile(PPC_DIVDEU_DOT(%0, %1, %2) :
+                                       "=r" (op->val) : "r" (regs->gpr[ra]),
+                                       "r" (regs->gpr[rb]));
+                               set_cr0(regs, op);
+                       } else {
+                               asm volatile(PPC_DIVDEU(%0, %1, %2) :
+                                       "=r" (op->val) : "r" (regs->gpr[ra]),
+                                       "r" (regs->gpr[rb]));
+                       }
+                       goto compute_done;
+#endif
                case 755:       /* darn */
                        if (!cpu_has_feature(CPU_FTR_ARCH_300))
                                return -1;
-- 
2.14.5