From: Alan Modra <amodra@gmail.com>
Date: Tue, 10 Dec 2019 22:23:50 +0000 (+1030)
Subject: ubsan: v850: left shift cannot be represented in type 'long'
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;ds=sidebyside;h=2a81ccbbbf81ab9c66ba366a0c1da7abb6460423;p=deliverable%2Fbinutils-gdb.git

ubsan: v850: left shift cannot be represented in type 'long'

	* v850-dis.c (get_operand_value): Use unsigned arithmetic.  Don't
	sign extend using shifts.
---

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 3ba885c48b..2ad26cb5d6 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-11  Alan Modra  <amodra@gmail.com>
+
+	* v850-dis.c (get_operand_value): Use unsigned arithmetic.  Don't
+	sign extend using shifts.
+
 2019-12-11  Alan Modra  <amodra@gmail.com>
 
 	* tic6x-dis.c (tic6x_extract_32): Avoid signed overflow.
diff --git a/opcodes/v850-dis.c b/opcodes/v850-dis.c
index f8b5d1c93f..45e6c65d83 100644
--- a/opcodes/v850-dis.c
+++ b/opcodes/v850-dis.c
@@ -88,7 +88,7 @@ get_operand_value (const struct v850_operand *operand,
 		   bfd_boolean noerror,
 		   int *invalid)
 {
-  long value;
+  unsigned long value;
   bfd_byte buffer[4];
 
   if ((operand->flags & V850E_IMMEDIATE16)
@@ -158,11 +158,13 @@ get_operand_value (const struct v850_operand *operand,
       if (operand->bits == -1)
 	value = (insn & operand->shift);
       else
-	value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
+	value = (insn >> operand->shift) & ((1ul << operand->bits) - 1);
 
       if (operand->flags & V850_OPERAND_SIGNED)
-	value = ((long)(value << (sizeof (long)*8 - operand->bits))
-		 >> (sizeof (long)*8 - operand->bits));
+	{
+	  unsigned long sign = 1ul << (operand->bits - 1);
+	  value = (value ^ sign) - sign;
+	}
     }
 
   return value;