bnd: Show warning when bnd prefix is dropped

When bnd prefix is dropped as jmp is encoded as jmp short,
nasm shows a warning message, which can be suppressed with a new
command line option, -w-bnd.

Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/assemble.c b/assemble.c
index bf1490d..f06cee8 100644
--- a/assemble.c
+++ b/assemble.c
@@ -385,6 +385,8 @@ static bool jmp_match(int32_t segment, int64_t offset, int bits,
     if (is_byte && c == 0371 && ins->prefixes[PPS_REP] == P_BND) {
         /* jmp short (opcode eb) cannot be used with bnd prefix. */
         ins->prefixes[PPS_REP] = P_none;
+        errfunc(ERR_WARNING | ERR_WARN_BND | ERR_PASS2 ,
+                "jmp short does not init bnd regs - bnd prefix dropped.");
     }
 
     return is_byte;