diff options
| author | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-05-19 13:52:10 -0500 |
|---|---|---|
| committer | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-05-19 13:52:10 -0500 |
| commit | c96ba2b2678e4b92e7969c683d4cb3f1648af813 (patch) | |
| tree | 38d8eef4cdc62a3ab508b4884a44657b22b9fbf7 /assembler/notes | |
| parent | a63eba62ae9faffea51ba618b0d20f132c23c452 (diff) | |
Rework assembler for simplified instruction set
- Remove commas and brackets from syntax
- Rename opcodes for unambiguous instruction encodings
- Redesign parse instruction encoding
- Implement opcode parser
- Add bit-width restriction to octal parser
Diffstat (limited to 'assembler/notes')
| -rw-r--r-- | assembler/notes | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/assembler/notes b/assembler/notes deleted file mode 100644 index 6206eff..0000000 --- a/assembler/notes +++ /dev/null @@ -1,35 +0,0 @@ -Clobber -R0: arg1, uart result -R1: arg2 -R2: -R3: shift_amount -------------- -Save -R4: octal result, register result -R5: word under construction -R6: parse instructions -R8: -R9: end_char - -1yyyxxxx Imm yyy = shift amount xxxx = bit-width -00000001 Brackets -0011yyyy Reg yyyy = shift amount -0100yyyy Reg - -MOVS 0x 00 00 88 38 -ADDS 0x 00 00 88 38 -SUBS 0x 00 00 88 38 -CMP 0x 00 00 33 30 -ANDS 0x 00 00 33 30 -ORRS 0x 00 00 33 30 -TST 0x 00 00 33 30 -LSLS 0x 00 E5 33 30 -LSRS 0x 00 E5 33 30 -RORS 0x 00 00 33 30 -LDR 0x E5 33 01 30 -LDRB 0x 36 33 01 30 -STR 0x E5 33 01 30 -STRB 0x 36 33 01 30 -B<c> 0x 00 00 00 88 -B 0x 00 00 00 8B -BX 0x 00 00 00 43 |