[PATCH v2 2/6] powerpc: sstep: Add support for darn instruction

[Sandipan Das]

This adds emulation support for the following integer instructions:
  * Deliver A Random Number (darn)

As suggested by Michael, this uses a raw .long for specifying the
instruction word when using inline assembly to retain compatibility
with older binutils.

Signed-off-by: Sandipan Das <sandipan at linux.ibm.com>
---
 arch/powerpc/lib/sstep.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 67e69ebd6c00..ab575e02f9b8 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1728,6 +1728,28 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 				(int) regs->gpr[rb];
 			goto arith_done;
 
+		case 755:	/* darn */
+			if (!cpu_has_feature(CPU_FTR_ARCH_300))
+				return -1;
+			switch (ra & 0x3) {
+			case 0:
+				/* 32-bit conditioned */
+				asm volatile(PPC_DARN(%0, 0) : "=r" (op->val));
+				goto compute_done;
+
+			case 1:
+				/* 64-bit conditioned */
+				asm volatile(PPC_DARN(%0, 1) : "=r" (op->val));
+				goto compute_done;
+
+			case 2:
+				/* 64-bit raw */
+				asm volatile(PPC_DARN(%0, 2) : "=r" (op->val));
+				goto compute_done;
+			}
+
+			return -1;
+
 
 /*
  * Logical instructions
-- 
2.19.2