diff options
| author | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-07-07 17:13:53 -0500 |
|---|---|---|
| committer | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-07-07 17:13:53 -0500 |
| commit | 17d59ac15b87588de2228aa768e99b5bbca4561c (patch) | |
| tree | c0e1f52fed4e77620fd3f8599b6ba9870e310143 /assembler/assemble.s | |
| parent | 420bc15ae16b736fbce1a4846126cd983dd3b75b (diff) | |
Add assembler (stage 2) top-level
Diffstat (limited to 'assembler/assemble.s')
| -rw-r--r-- | assembler/assemble.s | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/assembler/assemble.s b/assembler/assemble.s index 9517864..9f5c022 100644 --- a/assembler/assemble.s +++ b/assembler/assemble.s @@ -14,15 +14,12 @@ assemble: PUSH {LR} LDR R0, =uart_send LDR R1, =get_char - // ADDS R0, 1 - // ADDS R1, 1 MOV R9, R0 MOV R10, R1 MOVS R6, 0 MOVS R0, ' MOV R8, R0 LDR R1, =opcode - // ADDS R1, 1 BLX R1 MOV R0, R8 BLX R9 @@ -41,7 +38,6 @@ handle_reg: MOVS R1, (1<<4) // bit 4 mask // if 111xyyyy ANDS R0, R1 // get bit 4 ADDS R0, 3 // add 3 to it (now 3 or 4) LDR R1, =register - // ADDS R1, 1 BLX R1 MOVS R0, 0x0F // lower nibble mask ANDS R0, R7 // store shift amount in R0 @@ -65,7 +61,6 @@ fin: LSLS R0, R2 handle_imm: MOVS R1, 0x0F // lower nibble mask ANDS R0, R1 // store immediate width in R0 LDR R1, =octal - // ADDS R1, 1 BLX R1 // result is put in R4 LSLS R0, R7, 27 LSRS R0, 31 @@ -77,6 +72,4 @@ done_stuff: MOV R0, R8 // copy the end_char into R0 BLX R9 // echo the space (or carriage return) here: LSRS R7, 0x8 // get next parse instruction BNE main_loop // if it's nonzero there are more things to parse -done: MOVS R0, '\n // send newline - BLX R9 POP {PC} |