Aarch64 SVE pseudo register support

Add the functionality for reading/writing pseudo registers.

On SVE the V registers are pseudo registers. This is supported
by adding AARCH64_SVE_V0_REGNUM.

	* aarch64-tdep.c (AARCH64_SVE_V0_REGNUM): Add define.
	(aarch64_vnv_type): Add function.
	(aarch64_pseudo_register_name): Add V regs for SVE.
	(aarch64_pseudo_register_type): Likewise.
	(aarch64_pseudo_register_reggroup_p): Likewise.
	(aarch64_pseudo_read_value_2): Use V0 offset for SVE
	(aarch64_pseudo_read_value): Add V regs for SVE.
	(aarch64_pseudo_write_2): Use V0 offset for SVE
	(aarch64_pseudo_write): Add V regs for SVE.
	* aarch64-tdep.h (struct gdbarch_tdep): Add vnv_type.

gdb/ChangeLog

@@ -1,3 +1,16 @@
+2018-06-07  Alan Hayward  <alan.hayward@arm.com>
+
+        * aarch64-tdep.c (AARCH64_SVE_V0_REGNUM): Add define.
+        (aarch64_vnv_type): Add function.
+        (aarch64_pseudo_register_name): Add V regs for SVE.
+        (aarch64_pseudo_register_type): Likewise.
+        (aarch64_pseudo_register_reggroup_p): Likewise.
+        (aarch64_pseudo_read_value_2): Use V0 offset for SVE
+        (aarch64_pseudo_read_value): Add V regs for SVE.
+        (aarch64_pseudo_write_2): Use V0 offset for SVE
+        (aarch64_pseudo_write): Add V regs for SVE.
+        * aarch64-tdep.h (struct gdbarch_tdep): Add vnv_type.
+
 2018-06-05  Tom Tromey  <tom@tromey.com>
 
 	* cli/cli-cmds.c (show_version): Update.

gdb/aarch64-tdep.c

@@ -69,6 +69,7 @@
 #define AARCH64_S0_REGNUM (AARCH64_D0_REGNUM + 32)
 #define AARCH64_H0_REGNUM (AARCH64_S0_REGNUM + 32)
 #define AARCH64_B0_REGNUM (AARCH64_H0_REGNUM + 32)
+#define AARCH64_SVE_V0_REGNUM (AARCH64_B0_REGNUM + 32)
 
 /* All possible aarch64 target descriptors.  */
 struct target_desc *tdesc_aarch64_list[AARCH64_MAX_SVE_VQ + 1];
@@ -1766,6 +1767,30 @@ aarch64_vnb_type (struct gdbarch *gdbarch)
   return tdep->vnb_type;
 }
 
+/* Return the type for an AdvSISD V register.  */
+
+static struct type *
+aarch64_vnv_type (struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  if (tdep->vnv_type == NULL)
+    {
+      struct type *t = arch_composite_type (gdbarch, "__gdb_builtin_type_vnv",
+					    TYPE_CODE_UNION);
+
+      append_composite_type_field (t, "d", aarch64_vnd_type (gdbarch));
+      append_composite_type_field (t, "s", aarch64_vns_type (gdbarch));
+      append_composite_type_field (t, "h", aarch64_vnh_type (gdbarch));
+      append_composite_type_field (t, "b", aarch64_vnb_type (gdbarch));
+      append_composite_type_field (t, "q", aarch64_vnq_type (gdbarch));
+
+      tdep->vnv_type = t;
+    }
+
+  return tdep->vnv_type;
+}
+
 /* Implement the "dwarf2_reg_to_regnum" gdbarch method.  */
 
 static int
@@ -2114,6 +2139,8 @@ aarch64_gen_return_address (struct gdbarch *gdbarch,
 static const char *
 aarch64_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
   static const char *const q_name[] =
     {
       "q0", "q1", "q2", "q3",
@@ -2191,6 +2218,25 @@ aarch64_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
     return b_name[regnum - AARCH64_B0_REGNUM];
 
+  if (tdep->has_sve ())
+    {
+      static const char *const sve_v_name[] =
+	{
+	  "v0", "v1", "v2", "v3",
+	  "v4", "v5", "v6", "v7",
+	  "v8", "v9", "v10", "v11",
+	  "v12", "v13", "v14", "v15",
+	  "v16", "v17", "v18", "v19",
+	  "v20", "v21", "v22", "v23",
+	  "v24", "v25", "v26", "v27",
+	  "v28", "v29", "v30", "v31",
+	};
+
+      if (regnum >= AARCH64_SVE_V0_REGNUM
+	  && regnum < AARCH64_SVE_V0_REGNUM + AARCH64_V_REGS_NUM)
+	return sve_v_name[regnum - AARCH64_SVE_V0_REGNUM];
+    }
+
   internal_error (__FILE__, __LINE__,
 		  _("aarch64_pseudo_register_name: bad register number %d"),
 		  regnum);
@@ -2201,6 +2247,8 @@ aarch64_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
 static struct type *
 aarch64_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
@@ -2218,6 +2266,10 @@ aarch64_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
     return aarch64_vnb_type (gdbarch);
 
+  if (tdep->has_sve () && regnum >= AARCH64_SVE_V0_REGNUM
+      && regnum < AARCH64_SVE_V0_REGNUM + AARCH64_V_REGS_NUM)
+    return aarch64_vnv_type (gdbarch);
+
   internal_error (__FILE__, __LINE__,
 		  _("aarch64_pseudo_register_type: bad register number %d"),
 		  regnum);
@@ -2229,6 +2281,8 @@ static int
 aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 				    struct reggroup *group)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
@@ -2243,6 +2297,9 @@ aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
     return group == all_reggroup || group == vector_reggroup;
   else if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
     return group == all_reggroup || group == vector_reggroup;
+  else if (tdep->has_sve () && regnum >= AARCH64_SVE_V0_REGNUM
+	   && regnum < AARCH64_SVE_V0_REGNUM + AARCH64_V_REGS_NUM)
+    return group == all_reggroup || group == vector_reggroup;
 
   return group == all_reggroup;
 }
@@ -2250,17 +2307,22 @@ aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 /* Helper for aarch64_pseudo_read_value.  */
 
 static struct value *
-aarch64_pseudo_read_value_1 (readable_regcache *regcache, int regnum_offset,
+aarch64_pseudo_read_value_1 (struct gdbarch *gdbarch,
+			     readable_regcache *regcache, int regnum_offset,
 			     int regsize, struct value *result_value)
 {
-  gdb_byte reg_buf[V_REGISTER_SIZE];
   unsigned v_regnum = AARCH64_V0_REGNUM + regnum_offset;
 
+  /* Enough space for a full vector register.  */
+  gdb_byte reg_buf[register_size (gdbarch, AARCH64_V0_REGNUM)];
+  gdb_static_assert (AARCH64_V0_REGNUM == AARCH64_SVE_Z0_REGNUM);
+
   if (regcache->raw_read (v_regnum, reg_buf) != REG_VALID)
     mark_value_bytes_unavailable (result_value, 0,
 				  TYPE_LENGTH (value_type (result_value)));
   else
     memcpy (value_contents_raw (result_value), reg_buf, regsize);
+
   return result_value;
  }
 
@@ -2270,6 +2332,7 @@ static struct value *
 aarch64_pseudo_read_value (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int regnum)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   struct value *result_value = allocate_value (register_type (gdbarch, regnum));
 
   VALUE_LVAL (result_value) = lval_register;
@@ -2278,42 +2341,56 @@ aarch64_pseudo_read_value (struct gdbarch *gdbarch, readable_regcache *regcache,
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
-    return aarch64_pseudo_read_value_1 (regcache, regnum - AARCH64_Q0_REGNUM,
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_Q0_REGNUM,
 					Q_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32)
-    return aarch64_pseudo_read_value_1 (regcache, regnum - AARCH64_D0_REGNUM,
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_D0_REGNUM,
 					D_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32)
-    return aarch64_pseudo_read_value_1 (regcache, regnum - AARCH64_S0_REGNUM,
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_S0_REGNUM,
 					S_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32)
-    return aarch64_pseudo_read_value_1 (regcache, regnum - AARCH64_H0_REGNUM,
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_H0_REGNUM,
 					H_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
-    return aarch64_pseudo_read_value_1 (regcache, regnum - AARCH64_B0_REGNUM,
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_B0_REGNUM,
 					B_REGISTER_SIZE, result_value);
 
+  if (tdep->has_sve () && regnum >= AARCH64_SVE_V0_REGNUM
+      && regnum < AARCH64_SVE_V0_REGNUM + 32)
+    return aarch64_pseudo_read_value_1 (gdbarch, regcache,
+					regnum - AARCH64_SVE_V0_REGNUM,
+					V_REGISTER_SIZE, result_value);
+
   gdb_assert_not_reached ("regnum out of bound");
 }
 
 /* Helper for aarch64_pseudo_write.  */
 
 static void
-aarch64_pseudo_write_1 (struct regcache *regcache, int regnum_offset,
+aarch64_pseudo_write_1 (struct gdbarch *gdbarch, struct regcache *regcache,
-			int regsize, const gdb_byte *buf)
+			int regnum_offset, int regsize, const gdb_byte *buf)
 {
-  gdb_byte reg_buf[V_REGISTER_SIZE];
   unsigned v_regnum = AARCH64_V0_REGNUM + regnum_offset;
 
+  /* Enough space for a full vector register.  */
+  gdb_byte reg_buf[register_size (gdbarch, AARCH64_V0_REGNUM)];
+  gdb_static_assert (AARCH64_V0_REGNUM == AARCH64_SVE_Z0_REGNUM);
+
   /* Ensure the register buffer is zero, we want gdb writes of the
      various 'scalar' pseudo registers to behavior like architectural
      writes, register width bytes are written the remainder are set to
      zero.  */
-  memset (reg_buf, 0, sizeof (reg_buf));
+  memset (reg_buf, 0, register_size (gdbarch, AARCH64_V0_REGNUM));
 
   memcpy (reg_buf, buf, regsize);
   regcache->raw_write (v_regnum, reg_buf);
@@ -2325,27 +2402,39 @@ static void
 aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
 		      int regnum, const gdb_byte *buf)
 {
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
-    return aarch64_pseudo_write_1 (regcache, regnum - AARCH64_Q0_REGNUM,
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
-				   Q_REGISTER_SIZE, buf);
+				   regnum - AARCH64_Q0_REGNUM, Q_REGISTER_SIZE,
+				   buf);
 
   if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32)
-    return aarch64_pseudo_write_1 (regcache, regnum - AARCH64_D0_REGNUM,
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
-				   D_REGISTER_SIZE, buf);
+				   regnum - AARCH64_D0_REGNUM, D_REGISTER_SIZE,
+				   buf);
 
   if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32)
-    return aarch64_pseudo_write_1 (regcache, regnum - AARCH64_S0_REGNUM,
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
-				   S_REGISTER_SIZE, buf);
+				   regnum - AARCH64_S0_REGNUM, S_REGISTER_SIZE,
+				   buf);
 
   if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32)
-    return aarch64_pseudo_write_1 (regcache, regnum - AARCH64_H0_REGNUM,
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
-				   H_REGISTER_SIZE, buf);
+				   regnum - AARCH64_H0_REGNUM, H_REGISTER_SIZE,
+				   buf);
 
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
-    return aarch64_pseudo_write_1 (regcache, regnum - AARCH64_B0_REGNUM,
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
-				   B_REGISTER_SIZE, buf);
+				   regnum - AARCH64_B0_REGNUM, B_REGISTER_SIZE,
+				   buf);
+
+  if (tdep->has_sve () && regnum >= AARCH64_SVE_V0_REGNUM
+      && regnum < AARCH64_SVE_V0_REGNUM + 32)
+    return aarch64_pseudo_write_1 (gdbarch, regcache,
+				   regnum - AARCH64_SVE_V0_REGNUM,
+				   V_REGISTER_SIZE, buf);
 
   gdb_assert_not_reached ("regnum out of bound");
 }

gdb/aarch64-tdep.h

@@ -70,6 +70,7 @@ struct gdbarch_tdep
   struct type *vns_type;
   struct type *vnh_type;
   struct type *vnb_type;
+  struct type *vnv_type;
 
   /* syscall record.  */
   int (*aarch64_syscall_record) (struct regcache *regcache, unsigned long svc_number);