Add register parser and binary search for opcodes

1 files changed, 23 insertions, 0 deletions

diff --git a/newasm/parsers/whitespace.s b/newasm/parsers/whitespace.s
new file mode 100644
index 0000000..708cab3
--- /dev/null
+++ b/newasm/parsers/whitespace.s
@@ -0,0 +1,23 @@
+.syntax unified
+.cpu cortex-m0plus
+.thumb
+
+.type whitespace, %function
+.global whitespace
+
+// 1 unexpected char
+
+// R4 input buffer
+
+whitespace:
+          LDRB    R0, [R4]    // get a char
+          CMP     R0, '       // space
+          BEQ     1f
+          MOVS    R0, #1      // return code 1 (unexpected char)
+          BX      LR
+1:        ADDS    R4, 1       // consume the character
+          LDRB    R0, [R4]    // get another character
+          CMP     R0, '       // check if space
+          BEQ     1b          // if so keep getting chars
+          MOVS    R0, #0      // return code 0 (success)
+          BX      LR