bfd/ChangeLog:

[deliverable/binutils-gdb.git] / opcodes / cgen-asm.c

diff --git a/opcodes/cgen-asm.c b/opcodes/cgen-asm.c
index 6ed096b3346a9c4e7fa7bb97ae3e5e1e67d65691..901a578f54588d8e52396a0c8d951eddf22b2081 100644 (file)
--- a/opcodes/cgen-asm.c
+++ b/opcodes/cgen-asm.c
@@ -1,6 +1,6 @@
 /* CGEN generic assembler support code.
-   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007
-   Free Software Foundation, Inc.
+   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2007,
+   2011  Free Software Foundation, Inc.
 
    This file is part of libopcodes.
 
@@ -268,7 +268,23 @@ cgen_parse_signed_integer (CGEN_CPU_DESC cd,
      &result, &value);
   /* FIXME: Examine `result'.  */
   if (!errmsg)
-    *valuep = value;
+    {
+      /* Handle the case where a hex value is parsed on a 64-bit host.
+        A value like 0xffffe000 is clearly intended to be a negative
+        16-bit value, but on a 64-bit host it will be parsed by gas
+        as 0x00000000ffffe000.
+
+        The shifts below are designed not to produce compile time
+        warnings on a 32-bit host.  */
+      if (sizeof (value) > 4
+         && result == CGEN_PARSE_OPERAND_RESULT_NUMBER
+         && value > 0
+         && (value & 0x80000000)
+         && ((value >> 31) == 1))
+       value |= -1 << 31;
+
+      *valuep = value;
+    }
   return errmsg;
 }