[PATCH, moxie, sim] Add mul.x and umul.x instruction support

[Anthony Green <green@moxielogic.com>]

This patch adds support for the new mul.x and umul.x instructions for
the moxie simulator.  I'm checking this in.

Thanks,

AG


From sim/moxie/ChangeLog

2014-12-24  Anthony Green  <green@moxielogic.com>

	* interp.c (sim_resume): Add mul.x and umul.x instructions.


diff --git a/sim/moxie/interp.c b/sim/moxie/interp.c
index fdb6528..f57d166 100644
--- a/sim/moxie/interp.c
+++ b/sim/moxie/interp.c
@@ -622,8 +622,30 @@ sim_resume (sd, step, siggnal)
 		cpu.asregs.regs[a] = (int) bv & 0xffff;
 	      }
 	      break;
-	    case 0x14: /* bad */
-	    case 0x15: /* bad */
+	    case 0x14: /* mul.x */
+	      {
+		int a = (inst >> 4) & 0xf;
+		int b = inst & 0xf;
+		unsigned av = cpu.asregs.regs[a];
+		unsigned bv = cpu.asregs.regs[b];
+		TRACE("mul.x");
+		signed long long r = 
+		  (signed long long) av * (signed long long) bv;
+		cpu.asregs.regs[a] = r >> 32;
+	      }
+	      break;
+	    case 0x15: /* umul.x */
+	      {
+		int a = (inst >> 4) & 0xf;
+		int b = inst & 0xf;
+		unsigned av = cpu.asregs.regs[a];
+		unsigned bv = cpu.asregs.regs[b];
+		TRACE("umul.x");
+		unsigned long long r = 
+		  (unsigned long long) av * (unsigned long long) bv;
+		cpu.asregs.regs[a] = r >> 32;
+	      }
+	      break;
 	    case 0x16: /* bad */
 	    case 0x17: /* bad */
 	    case 0x18: /* bad */