powerpc/sstep: Add support for divde[.] and divdeu[.] instructions
This patch adds emulation support for divde, divdeu instructions,
- Divide Doubleword Extended (divde[.])
- Divide Doubleword Extended Unsigned (divdeu[.])
Signed-off-by: Balamuruhan S <bala24@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200728130308.1790982-3-bala24@linux.ibm.com
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index c58ea9e..caee8cc 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1806,7 +1806,18 @@ 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[.] */
+ asm volatile(PPC_DIVDE(%0, %1, %2) :
+ "=r" (op->val) : "r" (regs->gpr[ra]),
+ "r" (regs->gpr[rb]));
+ goto arith_done;
+ case 393: /* divdeu[.] */
+ asm volatile(PPC_DIVDEU(%0, %1, %2) :
+ "=r" (op->val) : "r" (regs->gpr[ra]),
+ "r" (regs->gpr[rb]));
+ goto arith_done;
+#endif
case 755: /* darn */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -1;
