X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=opcodes%2Faarch64-dis.c;h=7bd2c49aee39e724f3cce375cd2fa965f9c06718;hb=5496abe1c5c31aa6648e8fdb15e4122025bcabfe;hp=930056981385987d0428eed2b3022cf65bdde6b7;hpb=df6780137dc9d832db8c5525ecc760acdbcde5c9;p=deliverable%2Fbinutils-gdb.git

diff --git a/opcodes/aarch64-dis.c b/opcodes/aarch64-dis.c
index 9300569813..7bd2c49aee 100644
--- a/opcodes/aarch64-dis.c
+++ b/opcodes/aarch64-dis.c
@@ -1,5 +1,5 @@
 /* aarch64-dis.c -- AArch64 disassembler.
-   Copyright (C) 2009-2019 Free Software Foundation, Inc.
+   Copyright (C) 2009-2020 Free Software Foundation, Inc.
    Contributed by ARM Ltd.
 
    This file is part of the GNU opcodes library.
@@ -178,18 +178,15 @@ extract_all_fields (const aarch64_operand *self, aarch64_insn code)
 }
 
 /* Sign-extend bit I of VALUE.  */
-static inline int32_t
+static inline uint64_t
 sign_extend (aarch64_insn value, unsigned i)
 {
-  uint32_t ret = value;
+  uint64_t ret, sign;
 
   assert (i < 32);
-  if ((value >> i) & 0x1)
-    {
-      uint32_t val = (uint32_t)(-1) << i;
-      ret = ret | val;
-    }
-  return (int32_t) ret;
+  ret = value;
+  sign = (uint64_t) 1 << i;
+  return ((ret & (sign + sign - 1)) ^ sign) - sign;
 }
 
 /* N.B. the following inline helpfer functions create a dependency on the
@@ -658,7 +655,7 @@ aarch64_ext_imm (const aarch64_operand *self, aarch64_opnd_info *info,
 		 const aarch64_inst *inst ATTRIBUTE_UNUSED,
 		 aarch64_operand_error *errors ATTRIBUTE_UNUSED)
 {
-  int64_t imm;
+  uint64_t imm;
 
   imm = extract_all_fields (self, code);
 
@@ -2843,6 +2840,8 @@ aarch64_decode_variant_using_iclass (aarch64_inst *inst)
 
     case sve_size_tsz_bhs:
       i = extract_fields (inst->value, 0, 2, FLD_SVE_sz, FLD_SVE_tszl_19);
+      if (i == 0)
+	return FALSE;
       while (i != 1)
 	{
 	  if (i & 1)