From 0160d2e127f506bb36625861e2dd91e009583e24 Mon Sep 17 00:00:00 2001
From: andromeda <andromeda@lenovo>
Date: Sun, 15 Mar 2026 22:02:36 +0100
Subject: add binary

---
 twasm/asm/main.asm | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

(limited to 'twasm/asm/main.asm')

diff --git a/twasm/asm/main.asm b/twasm/asm/main.asm
index 069e3f3..c792eb9 100644
--- a/twasm/asm/main.asm
+++ b/twasm/asm/main.asm
@@ -730,7 +730,8 @@ tokenise:
 ; | type | p. | description  |
 ; |------|----|--------------|
 ; | 0x00 | 0x | hexidecimal  |
-; | 0x01 | 0b | octal        |
+; | 0x01 | 0q | octal        |
+; | 0x02 | 0b | binary       |
 ; | 0xFF |    | unrecognised |
 ;
 ; where `p.` is the prefix
@@ -774,6 +775,13 @@ evaluate_constant:
   je .oct_loop
   pop rcx
 
+  ; binary case
+  mov rcx, 0x02
+  push rcx
+  cmp dl, 'b'
+  je .bin_loop
+  pop rcx
+
   jmp .unrecognised
 
   .hex_loop:
@@ -822,6 +830,25 @@ evaluate_constant:
     inc rdi       ; point to next byte
     jmp .oct_loop ; and loop
 
+  .bin_loop:
+    cmp rsi, 0 ; range check
+    je .break
+
+    shl rax, 1
+
+    mov dl, [rdi]
+
+    sub dl, '0'
+    cmp dl, 1
+    jg .unrecognised
+
+    and dl, 1 ; mask
+    or al, dl ; and newest bit
+
+    dec rsi
+    inc rdi
+    jmp .bin_loop
+
   .break:
     pop rdx
     ret
-- 
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