From 6365d29c21d474ddca551eb66b162e39e035f42c Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Wed, 2 Jun 2010 12:58:11 -0500
Subject: ARM: Decode the VMRS instruction.

---
 src/arch/arm/isa/formats/fp.isa | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

(limited to 'src/arch/arm')

diff --git a/src/arch/arm/isa/formats/fp.isa b/src/arch/arm/isa/formats/fp.isa
index a51960641..7079631c7 100644
--- a/src/arch/arm/isa/formats/fp.isa
+++ b/src/arch/arm/isa/formats/fp.isa
@@ -255,9 +255,29 @@ def format ShortFpTransfer() {{
                 // A8-648
                 return new WarnUnimplemented("vmov", machInst);
             } else if (a == 7) {
-                // A8-658
-                // B6-27
-                return new WarnUnimplemented("vmrs", machInst);
+                const IntRegIndex rt =
+                    (IntRegIndex)(uint32_t)bits(machInst, 15, 12);
+                uint32_t specReg = bits(machInst, 19, 16);
+                switch (specReg) {
+                  case 0:
+                    specReg = MISCREG_FPSID;
+                    break;
+                  case 1:
+                    specReg = MISCREG_FPSCR;
+                    break;
+                  case 6:
+                    specReg = MISCREG_MVFR1;
+                    break;
+                  case 7:
+                    specReg = MISCREG_MVFR0;
+                    break;
+                  case 8:
+                    specReg = MISCREG_FPEXC;
+                    break;
+                  default:
+                    return new Unknown(machInst);
+                }
+                return new Vmrs(machInst, rt, (IntRegIndex)specReg);
             }
         } else {
             // A8-646
-- 
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