X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=opcodes%2Fcgen-asm.c;h=b1675045d9d1139cb850b54657796f375d05a84d;hb=423054beadf317757d43aefb9eddfe711a42e3e1;hp=6ed096b3346a9c4e7fa7bb97ae3e5e1e67d65691;hpb=9b201bb5e5daa9b4f783e6ece9cbfbdbf9f1d6f4;p=deliverable%2Fbinutils-gdb.git

diff --git a/opcodes/cgen-asm.c b/opcodes/cgen-asm.c
index 6ed096b334..b1675045d9 100644
--- a/opcodes/cgen-asm.c
+++ b/opcodes/cgen-asm.c
@@ -1,6 +1,5 @@
 /* CGEN generic assembler support code.
-   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007
-   Free Software Foundation, Inc.
+   Copyright (C) 1996-2020 Free Software Foundation, Inc.
 
    This file is part of libopcodes.
 
@@ -213,7 +212,7 @@ cgen_parse_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
      character of the suffix ('.') is special.  */
   if (*p)
     ++p;
-  
+
   /* Allow letters, digits, and any special characters.  */
   while (((p - start) < (int) sizeof (buf))
 	 && *p
@@ -268,7 +267,23 @@ 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 |= ((bfd_vma) -1) << 31;
+
+      *valuep = value;
+    }
   return errmsg;
 }