commit a170576856fedfcdd7d8602cb5650a33d13d38f5
author Peter Maydell <peter.maydell@linaro.org> Fri Jan 14 20:39:18 2011 +0100
committer Aurelien Jarno <aurelien@aurel32.net> Fri Jan 14 20:39:18 2011 +0100
tree 9dfa5bdc9fc3d968d55e27789160cbdcbddd6145
parent 39ea3d4eaf1ff300ee55946108394729bc053dfa

target-arm: Add symbolic constants for bitfields in TB flags

Add symbolic constants for the bitfields we use in the TB flags.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

target-arm/cpu.h

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index e501cf5..07b92d6 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -453,17 +453,50 @@
 
 #include "cpu-all.h"
 
+/* Bit usage in the TB flags field: */
+#define ARM_TBFLAG_THUMB_SHIFT      0
+#define ARM_TBFLAG_THUMB_MASK       (1 << ARM_TBFLAG_THUMB_SHIFT)
+#define ARM_TBFLAG_VECLEN_SHIFT     1
+#define ARM_TBFLAG_VECLEN_MASK      (0x7 << ARM_TBFLAG_VECLEN_SHIFT)
+#define ARM_TBFLAG_VECSTRIDE_SHIFT  4
+#define ARM_TBFLAG_VECSTRIDE_MASK   (0x3 << ARM_TBFLAG_VECSTRIDE_SHIFT)
+#define ARM_TBFLAG_PRIV_SHIFT       6
+#define ARM_TBFLAG_PRIV_MASK        (1 << ARM_TBFLAG_PRIV_SHIFT)
+#define ARM_TBFLAG_VFPEN_SHIFT      7
+#define ARM_TBFLAG_VFPEN_MASK       (1 << ARM_TBFLAG_VFPEN_SHIFT)
+#define ARM_TBFLAG_CONDEXEC_SHIFT   8
+#define ARM_TBFLAG_CONDEXEC_MASK    (0xff << ARM_TBFLAG_CONDEXEC_SHIFT)
+/* Bits 31..16 are currently unused. */
+
+/* some convenience accessor macros */
+#define ARM_TBFLAG_THUMB(F) \
+    (((F) & ARM_TBFLAG_THUMB_MASK) >> ARM_TBFLAG_THUMB_SHIFT)
+#define ARM_TBFLAG_VECLEN(F) \
+    (((F) & ARM_TBFLAG_VECLEN_MASK) >> ARM_TBFLAG_VECLEN_SHIFT)
+#define ARM_TBFLAG_VECSTRIDE(F) \
+    (((F) & ARM_TBFLAG_VECSTRIDE_MASK) >> ARM_TBFLAG_VECSTRIDE_SHIFT)
+#define ARM_TBFLAG_PRIV(F) \
+    (((F) & ARM_TBFLAG_PRIV_MASK) >> ARM_TBFLAG_PRIV_SHIFT)
+#define ARM_TBFLAG_VFPEN(F) \
+    (((F) & ARM_TBFLAG_VFPEN_MASK) >> ARM_TBFLAG_VFPEN_SHIFT)
+#define ARM_TBFLAG_CONDEXEC(F) \
+    (((F) & ARM_TBFLAG_CONDEXEC_MASK) >> ARM_TBFLAG_CONDEXEC_SHIFT)
+
 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
                                         target_ulong *cs_base, int *flags)
 {
     *pc = env->regs[15];
     *cs_base = 0;
-    *flags = env->thumb | (env->vfp.vec_len << 1)
-            | (env->vfp.vec_stride << 4) | (env->condexec_bits << 8);
-    if ((env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR)
-        *flags |= (1 << 6);
-    if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30))
-        *flags |= (1 << 7);
+    *flags = (env->thumb << ARM_TBFLAG_THUMB_SHIFT)
+        | (env->vfp.vec_len << ARM_TBFLAG_VECLEN_SHIFT)
+        | (env->vfp.vec_stride << ARM_TBFLAG_VECSTRIDE_SHIFT)
+        | (env->condexec_bits << ARM_TBFLAG_CONDEXEC_SHIFT);
+    if ((env->uncached_cpsr & CPSR_M) != ARM_CPU_MODE_USR) {
+        *flags |= ARM_TBFLAG_PRIV_MASK;
+    }
+    if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30)) {
+        *flags |= ARM_TBFLAG_VFPEN_MASK;
+    }
 }
 
 #endif