aboutsummaryrefslogtreecommitdiff
path: root/newasm/opcode.s
diff options
context:
space:
mode:
authorJacques Comeaux <jacquesrcomeaux@protonmail.com>2024-08-23 19:46:17 -0500
committerJacques Comeaux <jacquesrcomeaux@protonmail.com>2024-08-23 19:46:17 -0500
commit80d8f3ae48255f786bd4d52a1819ea0c339f6946 (patch)
tree70126a16181caf459cfcf79fce983655a7a704e5 /newasm/opcode.s
parentb08def431c09449b5ad2ff4379fb403b2e1bf67b (diff)
Add register parser and binary search for opcodes
Diffstat (limited to 'newasm/opcode.s')
-rw-r--r--newasm/opcode.s40
1 files changed, 0 insertions, 40 deletions
diff --git a/newasm/opcode.s b/newasm/opcode.s
deleted file mode 100644
index 71a5201..0000000
--- a/newasm/opcode.s
+++ /dev/null
@@ -1,40 +0,0 @@
-.syntax unified
-.cpu cortex-m0plus
-.thumb
-
-.type opcode, %function
-.global opcode
-
-// 1 unexpected first char
-
-// R1 input buffer
-// R2 output buffer
-
-opcode: PUSH {LR}
- LDRB R0, [R1] // get a char
- CMP R0, 0x41 // A
- BLO 1f
- CMP R0, 0x5A // Z
- BLS 2f
-1: MOVS R0, #1 // unexpected char
- POP {PC}
-2: ADDS R1, 1 // consume the character
- STRB R0, [R2] // store in temp buffer
- ADDS R2, 1 // advance temp buffer pointer
- LDRB R0, [R1] // get another character
- BL goodchar // check if valid symbol char
- BEQ 2b // if so keep getting chars
- MOVS R0, #0 // return code success
- STRB R0, [R2] // write null byte
- POP {PC}
-
-goodchar: CMP R0, '0
- BLO bad
- CMP R0, '9
- BLS good
- CMP R0, 'A
- BLO bad
- CMP R0, 'Z
- BHI bad
-good: CMP R0, R0
-bad: BX LR