diff options
| author | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-08-24 01:14:04 -0500 |
|---|---|---|
| committer | Jacques Comeaux <jacquesrcomeaux@protonmail.com> | 2024-08-24 01:14:04 -0500 |
| commit | ee01f1a7f1e10be78bcceb4f0f42aa352a6a588f (patch) | |
| tree | 271e7034ee94e4447784db5b31bf8e332b30fbba /newasm/optable.s | |
| parent | 80d8f3ae48255f786bd4d52a1819ea0c339f6946 (diff) | |
Diffstat (limited to 'newasm/optable.s')
| -rw-r--r-- | newasm/optable.s | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/newasm/optable.s b/newasm/optable.s index a063f02..fb80ab4 100644 --- a/newasm/optable.s +++ b/newasm/optable.s @@ -5,9 +5,6 @@ .type lookup, %function .global lookup -// 1 unexpected char -// 2 unexpected end of input - // input: // R0 input string (unboxed) @@ -25,7 +22,7 @@ loop: CMP R5, R6 // if begin == end then range = 0 BEQ error ADDS R2, R5, R6 // get sum LSRS R2, 1 // divide by two -no_jiggle:LSLS R3, R2, 3 // times 8 (index to offset) + LSLS R3, R2, 3 // times 8 (index to offset) LDR R1, [R4, R3]// read opcode from optable CMP R0, R1 // compare opcode to input BLO lower // if lower @@ -42,7 +39,7 @@ lower: MOVS R6, R2 // update end pointer B loop higher: ADDS R5, R2, 1 // update begin pointer B loop -error: MOVS R0, 1 // return code 1 (not found) +error: MOVS R0, 4 // return code 4 (opcode not found) POP {R4, R5, R6} BX LR @@ -53,5 +50,5 @@ op_table: .ascii "ASPI"; .hword 0xB000; .byte 0x04, 0x07 // instr type 4, special code 7 .ascii "ASRI"; .hword 0x1000; .byte 0x01, 0x05 // instr type 1, special code 5 (imm width) .ascii "ADCS"; .hword 0x4140; .byte 0x00, 0x00 // instr type 0, special code 0 - .ascii "ADDS"; .hword 0x1400; .byte 0x03, 0x00 // instr type 3, special code 0 + .ascii "ADDS"; .hword 0x1800; .byte 0x03, 0x00 // instr type 3, special code 0 .ascii "BKPT"; .hword 0xBE00; .byte 0x04, 0x08 // instr type 4, special code 8 |