ubsan: tc-z80.c:3656 shift exponent 32 is too large

	* config/tc-z80.c (is_overflow): Avoid too large shift.

diff --git a/gas/ChangeLog b/gas/ChangeLog
index d6b58b485273992abc7bdbbfcd5f8ba70ced5776..641b68de66afc67be53c275569540f504189c26f 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,7 @@
+2020-09-02  Alan Modra  <amodra@gmail.com>
+
+       * config/tc-z80.c (is_overflow): Avoid too large shift.
+
 2020-09-02  Alan Modra  <amodra@gmail.com>
 
        * config/tc-sparc.c (in_signed_range): Use an unsigned type for

diff --git a/gas/config/tc-z80.c b/gas/config/tc-z80.c
index 45fcd6fbf74b5fb86e238401cfbe79c18e301407..2e17d00552271a6f16189fe9adf697f53b7e384f 100644 (file)
--- a/gas/config/tc-z80.c
+++ b/gas/config/tc-z80.c
@@ -3653,7 +3653,7 @@ md_assemble (char *str)
 static int
 is_overflow (long value, unsigned bitsize)
 {
-  long fieldmask = (1UL << bitsize) - 1;
+  long fieldmask = (2UL << (bitsize - 1)) - 1;
   long signmask = ~fieldmask;
   long a = value & fieldmask;
   long ss = a & signmask;