AArch64: Refactor verifiers to make more general.

The current verifiers only take an instruction description and encoded value as
arguments.  This was enough when the verifiers only needed to do simple checking
but it's insufficient for the purposes of validating instruction sequences.

This patch adds the required arguments and also a flag to allow a verifier to
distinguish between whether it's being run during encoding or decoding.  It also
allows for errors and warnings to be returned by a verifier instead of a simple
pass/fail.

include/

	* opcode/aarch64.h (struct aarch64_opcode): Expand verifiers to take
	more arguments.

opcodes/

	* aarch64-dis.c (aarch64_opcode_decode): Update verifier call.
	* aarch64-opc.c (verify_ldpsw): Update arguments.

5 files changed, 24 insertions, 8 deletions

diff --git a/include/ChangeLog b/include/ChangeLog
index 97f36ed..dc200a1 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,5 +1,10 @@
 2018-10-03  Tamar Christina  <tamar.christina@arm.com>
 
+	* opcode/aarch64.h (struct aarch64_opcode): Expand verifiers to take
+	more arguments.
+
+2018-10-03  Tamar Christina  <tamar.christina@arm.com>
+
 	* opcode/aarch64.h (enum err_type): New.
 	(aarch64_decode_insn): Use it.
 
diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index 40de440..751d7bb 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -727,7 +727,9 @@ struct aarch64_opcode
   unsigned char tied_operand;
 
   /* If non-NULL, a function to verify that a given instruction is valid.  */
-  bfd_boolean (* verifier) (const struct aarch64_opcode *, const aarch64_insn);
+  enum err_type (* verifier) (const struct aarch64_inst *, const aarch64_insn,
+			      bfd_vma, bfd_boolean, aarch64_operand_error *,
+			      struct aarch64_instr_sequence *);
 };
 
 typedef struct aarch64_opcode aarch64_opcode;
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 1da4e80..aae5459 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,5 +1,10 @@
 2018-10-03  Tamar Christina  <tamar.christina@arm.com>
 
+	* aarch64-dis.c (aarch64_opcode_decode): Update verifier call.
+	* aarch64-opc.c (verify_ldpsw): Update arguments.
+
+2018-10-03  Tamar Christina  <tamar.christina@arm.com>
+
 	* aarch64-dis.c (ERR_OK, ERR_UND, ERR_UNP, ERR_NYI): Remove.
 	(aarch64_decode_insn, print_insn_aarch64_word): Use err_type.
 
diff --git a/opcodes/aarch64-dis.c b/opcodes/aarch64-dis.c
index c08c82f..373ddae 100644
--- a/opcodes/aarch64-dis.c
+++ b/opcodes/aarch64-dis.c
@@ -2885,7 +2885,8 @@ aarch64_opcode_decode (const aarch64_opcode *opcode, const aarch64_insn code,
     }
 
   /* If the opcode has a verifier, then check it now.  */
-  if (opcode->verifier && ! opcode->verifier (opcode, code))
+  if (opcode->verifier
+      && opcode->verifier (inst, code, 0, FALSE, errors, NULL) != ERR_OK)
     {
       DEBUG_TRACE ("operand verifier FAIL");
       goto decode_fail;
diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index ba2af7b..f35f0d6 100644
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -4486,9 +4486,12 @@ aarch64_sys_ins_reg_supported_p (const aarch64_feature_set features,
 #define BIT(INSN,BT)     (((INSN) >> (BT)) & 1)
 #define BITS(INSN,HI,LO) (((INSN) >> (LO)) & ((1 << (((HI) - (LO)) + 1)) - 1))
 
-static bfd_boolean
-verify_ldpsw (const struct aarch64_opcode * opcode ATTRIBUTE_UNUSED,
-	      const aarch64_insn insn)
+static enum err_type
+verify_ldpsw (const struct aarch64_inst *inst ATTRIBUTE_UNUSED,
+	      const aarch64_insn insn, bfd_vma pc ATTRIBUTE_UNUSED,
+	      bfd_boolean encoding ATTRIBUTE_UNUSED,
+	      aarch64_operand_error *mismatch_detail ATTRIBUTE_UNUSED,
+	      aarch64_instr_sequence *insn_block ATTRIBUTE_UNUSED)
 {
   int t  = BITS (insn, 4, 0);
   int n  = BITS (insn, 9, 5);
@@ -4498,17 +4501,17 @@ verify_ldpsw (const struct aarch64_opcode * opcode ATTRIBUTE_UNUSED,
     {
       /* Write back enabled.  */
       if ((t == n || t2 == n) && n != 31)
-	return FALSE;
+	return ERR_UND;
     }
 
   if (BIT (insn, 22))
     {
       /* Load */
       if (t == t2)
-	return FALSE;
+	return ERR_UND;
     }
 
-  return TRUE;
+  return ERR_OK;
 }
 
 /* Return true if VALUE cannot be moved into an SVE register using DUP