From: Alan Modra <amodra@gmail.com>
Date: Tue, 10 Dec 2019 07:27:14 +0000 (+1030)
Subject: ubsan: ia64: left shift of negative value
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=8ff23dba80b80a9f47d75dd43812e041f6674763;p=deliverable%2Fbinutils-gdb.git

ubsan: ia64: left shift of negative value

Here, since val is signed:
   *valuep = (val << scale);

	* cpu-ia64-opc.c (ext_imms_scaled): Avoid undefined left shift
	of negative values by using unsigned vars.
---

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 50c878b29d..17ad44160a 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-11  Alan Modra  <amodra@gmail.com>
+
+	* cpu-ia64-opc.c (ext_imms_scaled): Avoid undefined left shift
+	of negative values by using unsigned vars.
+
 2019-12-07  Alan Modra  <amodra@gmail.com>
 
 	PR 25236
diff --git a/bfd/cpu-ia64-opc.c b/bfd/cpu-ia64-opc.c
index 84ee0e2e4a..8df90befe3 100644
--- a/bfd/cpu-ia64-opc.c
+++ b/bfd/cpu-ia64-opc.c
@@ -186,7 +186,7 @@ ext_imms_scaled (const struct ia64_operand *self, ia64_insn code,
 		 ia64_insn *valuep, int scale)
 {
   int i, bits = 0, total = 0;
-  BFD_HOST_64_BIT val = 0, sign;
+  BFD_HOST_U_64_BIT val = 0, sign;
 
   for (i = 0; i < NELEMS (self->field) && self->field[i].bits; ++i)
     {
@@ -196,10 +196,10 @@ ext_imms_scaled (const struct ia64_operand *self, ia64_insn code,
       total += bits;
     }
   /* sign extend: */
-  sign = (BFD_HOST_64_BIT) 1 << (total - 1);
+  sign = (BFD_HOST_U_64_BIT) 1 << (total - 1);
   val = (val ^ sign) - sign;
 
-  *valuep = (val << scale);
+  *valuep = val << scale;
   return 0;
 }