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[PATCH 5/8] Add aarch64 psuedo help functions

From: Alan Hayward <alan dot hayward at arm dot com>
To: gdb-patches at sourceware dot org
Cc: nd at arm dot com, Alan Hayward <alan dot hayward at arm dot com>
Date: Fri, 11 May 2018 11:52:53 +0100
Subject: [PATCH 5/8] Add aarch64 psuedo help functions
Nodisclaimer: True
References: <20180511105256.27388-1-alan.hayward@arm.com>
Spamdiagnosticmetadata: NSPM
Spamdiagnosticoutput: 1:99

Reduce code copy/paste by adding two helper functions for
aarch64_pseudo_read_value and aarch64_pseudo_write
The patch does not change any functionality.

2018-05-11  Alan Hayward  <alan.hayward@arm.com>

	* aarch64-tdep.c (aarch64_pseudo_read_value_2): New helper func.
	(aarch64_pseudo_write_2): Likewise.
	(aarch64_pseudo_read_value): Use helper.
	(aarch64_pseudo_write): Likewise.
---
 gdb/aarch64-tdep.c | 173 +++++++++++++++++------------------------------------
 1 file changed, 54 insertions(+), 119 deletions(-)

diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 7893579d58..003fefb3c9 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2247,109 +2247,67 @@ aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
   return group == all_reggroup;
 }
 
+/* Inner version of aarch64_pseudo_read_value.  */
+
+static struct value *
+aarch64_pseudo_read_value_2 (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;
+
+  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;
+ }
+
 /* Implement the "pseudo_register_read_value" gdbarch method.  */
 
 static struct value *
-aarch64_pseudo_read_value (struct gdbarch *gdbarch,
-			   readable_regcache *regcache,
+aarch64_pseudo_read_value (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int regnum)
 {
-  gdb_byte reg_buf[V_REGISTER_SIZE];
-  struct value *result_value;
-  gdb_byte *buf;
+  struct value *result_value = allocate_value (register_type (gdbarch, regnum));
 
-  result_value = allocate_value (register_type (gdbarch, regnum));
   VALUE_LVAL (result_value) = lval_register;
   VALUE_REGNUM (result_value) = regnum;
-  buf = value_contents_raw (result_value);
 
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
-    {
-      enum register_status status;
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_Q0_REGNUM;
-      status = regcache->raw_read (v_regnum, reg_buf);
-      if (status != REG_VALID)
-	mark_value_bytes_unavailable (result_value, 0,
-				      TYPE_LENGTH (value_type (result_value)));
-      else
-	memcpy (buf, reg_buf, Q_REGISTER_SIZE);
-      return result_value;
-    }
+    return aarch64_pseudo_read_value_2 (regcache, regnum - AARCH64_Q0_REGNUM,
+					Q_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32)
-    {
-      enum register_status status;
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_D0_REGNUM;
-      status = regcache->raw_read (v_regnum, reg_buf);
-      if (status != REG_VALID)
-	mark_value_bytes_unavailable (result_value, 0,
-				      TYPE_LENGTH (value_type (result_value)));
-      else
-	memcpy (buf, reg_buf, D_REGISTER_SIZE);
-      return result_value;
-    }
+    return aarch64_pseudo_read_value_2 (regcache, regnum - AARCH64_D0_REGNUM,
+					D_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32)
-    {
-      enum register_status status;
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_S0_REGNUM;
-      status = regcache->raw_read (v_regnum, reg_buf);
-      if (status != REG_VALID)
-	mark_value_bytes_unavailable (result_value, 0,
-				      TYPE_LENGTH (value_type (result_value)));
-      else
-	memcpy (buf, reg_buf, S_REGISTER_SIZE);
-      return result_value;
-    }
+    return aarch64_pseudo_read_value_2 (regcache, regnum - AARCH64_S0_REGNUM,
+					S_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32)
-    {
-      enum register_status status;
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_H0_REGNUM;
-      status = regcache->raw_read (v_regnum, reg_buf);
-      if (status != REG_VALID)
-	mark_value_bytes_unavailable (result_value, 0,
-				      TYPE_LENGTH (value_type (result_value)));
-      else
-	memcpy (buf, reg_buf, H_REGISTER_SIZE);
-      return result_value;
-    }
+    return aarch64_pseudo_read_value_2 (regcache, regnum - AARCH64_H0_REGNUM,
+					H_REGISTER_SIZE, result_value);
 
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
-    {
-      enum register_status status;
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_B0_REGNUM;
-      status = regcache->raw_read (v_regnum, reg_buf);
-      if (status != REG_VALID)
-	mark_value_bytes_unavailable (result_value, 0,
-				      TYPE_LENGTH (value_type (result_value)));
-      else
-	memcpy (buf, reg_buf, B_REGISTER_SIZE);
-      return result_value;
-    }
+    return aarch64_pseudo_read_value_2 (regcache, regnum - AARCH64_B0_REGNUM,
+					B_REGISTER_SIZE, result_value);
 
   gdb_assert_not_reached ("regnum out of bound");
 }
 
-/* Implement the "pseudo_register_write" gdbarch method.  */
+/* Inner version of aarch64_pseudo_write.  */
 
 static void
-aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
-		      int regnum, const gdb_byte *buf)
+aarch64_pseudo_write_2 (struct regcache *regcache, int regnum_offset,
+			int regsize, const gdb_byte *buf)
 {
   gdb_byte reg_buf[V_REGISTER_SIZE];
+  unsigned v_regnum = AARCH64_V0_REGNUM + regnum_offset;
 
   /* Ensure the register buffer is zero, we want gdb writes of the
      various 'scalar' pseudo registers to behavior like architectural
@@ -2357,61 +2315,38 @@ aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
      zero.  */
   memset (reg_buf, 0, sizeof (reg_buf));
 
+  memcpy (reg_buf, buf, regsize);
+  regcache->raw_write (v_regnum, reg_buf);
+}
+
+/* Implement the "pseudo_register_write" gdbarch method.  */
+
+static void
+aarch64_pseudo_write (struct gdbarch *gdbarch, struct regcache *regcache,
+		      int regnum, const gdb_byte *buf)
+{
+
   regnum -= gdbarch_num_regs (gdbarch);
 
   if (regnum >= AARCH64_Q0_REGNUM && regnum < AARCH64_Q0_REGNUM + 32)
-    {
-      /* pseudo Q registers */
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_Q0_REGNUM;
-      memcpy (reg_buf, buf, Q_REGISTER_SIZE);
-      regcache_raw_write (regcache, v_regnum, reg_buf);
-      return;
-    }
+    return aarch64_pseudo_write_2 (regcache, regnum - AARCH64_Q0_REGNUM,
+				   Q_REGISTER_SIZE, buf);
 
   if (regnum >= AARCH64_D0_REGNUM && regnum < AARCH64_D0_REGNUM + 32)
-    {
-      /* pseudo D registers */
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_D0_REGNUM;
-      memcpy (reg_buf, buf, D_REGISTER_SIZE);
-      regcache_raw_write (regcache, v_regnum, reg_buf);
-      return;
-    }
+    return aarch64_pseudo_write_2 (regcache, regnum - AARCH64_D0_REGNUM,
+				   D_REGISTER_SIZE, buf);
 
   if (regnum >= AARCH64_S0_REGNUM && regnum < AARCH64_S0_REGNUM + 32)
-    {
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_S0_REGNUM;
-      memcpy (reg_buf, buf, S_REGISTER_SIZE);
-      regcache_raw_write (regcache, v_regnum, reg_buf);
-      return;
-    }
+    return aarch64_pseudo_write_2 (regcache, regnum - AARCH64_S0_REGNUM,
+				   S_REGISTER_SIZE, buf);
 
   if (regnum >= AARCH64_H0_REGNUM && regnum < AARCH64_H0_REGNUM + 32)
-    {
-      /* pseudo H registers */
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_H0_REGNUM;
-      memcpy (reg_buf, buf, H_REGISTER_SIZE);
-      regcache_raw_write (regcache, v_regnum, reg_buf);
-      return;
-    }
+    return aarch64_pseudo_write_2 (regcache, regnum - AARCH64_H0_REGNUM,
+				   H_REGISTER_SIZE, buf);
 
   if (regnum >= AARCH64_B0_REGNUM && regnum < AARCH64_B0_REGNUM + 32)
-    {
-      /* pseudo B registers */
-      unsigned v_regnum;
-
-      v_regnum = AARCH64_V0_REGNUM + regnum - AARCH64_B0_REGNUM;
-      memcpy (reg_buf, buf, B_REGISTER_SIZE);
-      regcache_raw_write (regcache, v_regnum, reg_buf);
-      return;
-    }
+    return aarch64_pseudo_write_2 (regcache, regnum - AARCH64_B0_REGNUM,
+				   B_REGISTER_SIZE, buf);
 
   gdb_assert_not_reached ("regnum out of bound");
 }
-- 
2.15.1 (Apple Git-101)

Follow-Ups:
- Re: [PATCH 5/8] Add aarch64 psuedo help functions
  - From: Simon Marchi

References:
- [PATCH 0/8] Add SVE support for Aarch64 GDB
  - From: Alan Hayward

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