oasm: Add encoding for BR instruction

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

1 files changed, 21 insertions, 0 deletions

diff --git a/usr.bin/oasm/lex.c b/usr.bin/oasm/lex.c
index 7b78d54..3ca9e8d 100644
--- a/usr.bin/oasm/lex.c
+++ b/usr.bin/oasm/lex.c
@@ -47,6 +47,7 @@ static char putback = '\0';
 #define S_IMN_INC  "inc"
 #define S_IMN_DEC  "dec"
 #define S_IMN_HLT  "hlt"
+#define S_IMN_BR   "br"
 
 /*
  * Returns 0 if a char is counted as a
@@ -190,6 +191,19 @@ token_arith(char *p)
     return TT_UNKNOWN;
 }
 
+/*
+ * Control flow instructions
+ */
+static tt_t
+token_cfi(char *p)
+{
+    if (strcmp(p, S_IMN_BR) == 0) {
+        return TT_BR;
+    }
+
+    return TT_UNKNOWN;
+}
+
 static tt_t
 token_xreg(char *p)
 {
@@ -293,6 +307,13 @@ lex_tok(struct oasm_state *state, struct oasm_token *ttp)
             return 0;
         }
 
+        /* Control flow instruction? */
+        if ((tok = token_cfi(p)) != TT_UNKNOWN) {
+            ttp->type = tok;
+            ttp->raw = p;
+            return 0;
+        }
+
         /* Register? */
         if ((tok = token_reg(p)) != TT_UNKNOWN) {
             ttp->is_reg = 1;