oasm: Introduce logical shift operations

This commit introduces LSR/LSL which are used as bitwise shift
operations.

--
lsr x1, #1   !! x1 >>= 1
lsl x1, #1   !! x1 <<= 1
--

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/usr.bin/oasm/lex.c b/usr.bin/oasm/lex.c
index ce97400..1f58d07 100644
--- a/usr.bin/oasm/lex.c
+++ b/usr.bin/oasm/lex.c
@@ -57,6 +57,8 @@ static char putback = '\0';
 #define S_IMN_AND  "and"
 #define S_IMN_OR   "or"
 #define S_IMN_XOR  "xor"
+#define S_IMN_LSL  "lsl"
+#define S_IMN_LSR  "lsr"
 
 /* Instruction length */
 #define OSMX64_INST_LEN 4
@@ -269,6 +271,12 @@ token_bitw(char *p)
         return token;
     }
 
+    if (strcmp(p, S_IMN_LSL) == 0) {
+        return TT_LSL;
+    } else if (strcmp(p, S_IMN_LSR) == 0) {
+        return TT_LSR;
+    }
+
     return TT_UNKNOWN;
 }