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Assembly Language (彙編語言) Back
- 這裡著重討論ARM處理器彙編指令集
1. Overview
| Code | Description |
|---|---|
| MOV R0, #15 | 立即數15放入寄存器R0 |
| MOV R0, R1, R2 | R0 <= R1 + R2 |
| LDR R0, [R4] | 從R4取出地址然後在那個地址上取出數據放入R0, R0 <= [R4] |
| ADD R0, R1, R2, LSL #1 | R2左移一位後與R1相加並放入R0 |
| LDR R0, [R1, #4] | R0 <= [R1 + 4] |
| LDR R0, [R1, #4]! | R0 <= [R1 + 4], R1 <= R1 + 4 |
| LDR R0, [R1], #4 | R0 <= [R1], R1 <= R1 + 4 |
| LDR R0, [R1, R2] | R0 <= [R1 + R2] |
| BL proc | 跳轉到子程序proc執行, 執行完返回(L標誌: 帶返回的跳轉) |
| STMFD R13! {R0 - R4} | 把R0到R4壓入到頭指針為R13的堆棧中, FD標誌滿棧遞減, 即每次壓入地址減少 |
| LDMFD R13!, {R0 - R4} | 把R0到R4彈出棧 |
2. Shift
| Code | Description |
|---|---|
| MOV R0, R1, LSL #1 | R1左移一位並放入R0 |
| MOVS R0, R1, LSL #1 | R1左移一位並放入R0後, 更新狀態標誌位 |
| MOVS R0, R1, LSR #1 | R1右移一位並放入R0後, 更新狀態標誌位 |
| MOVS R0, R1, ASR #1 | R1算術右移一位並放入R0後, 更新狀態標誌位 |
| MOVS R0, R1, ROR #1 | R1循環右移一位並放入R0後, 更新狀態標誌位 |
| MOVS R0, R1, RRX | R1循環右移一位並放入R0後, 更新狀態標誌位 |
3. Arithmetic
| Code | Description |
|---|---|
| ADDS R0, R2, R4 | (64位相加) R2加上R4後, 把低32位放入R0. |
| ADC R1, R3, R5 | (64位相加) R3加上R5後, 把高32位放入R1, 且加上低位的進位 |
| SUBS R0, R2, R4 | (64位相減) R2減去R4後, 把低32位放入R0. |
| SBC R1, R3, R5 | (64位相加) R3減去R5後, 把高32位放入R1, 且減去低位的借位 |
| RSB R0, R1, R2 | R2減去R1後, 值放入R0 |
| RSB R0, R1, #6 | 6減去R1後, 值放入R0 |
| RSC R0, R1, R2 | R2減去R1再減去借位後, 值放入R0 |
4. Logic
| Code | Description |
|---|---|
| AND R0, R0, #0xF | R0與0xF相與後放入R0 |
| ORR R0, R0, #9 | R0與9相或後放入R0 |
| EOR R0, R0, #0xF | R0與0xF相異或後放入R0 |
| BIC R0, R0, #9 | R0第0位和第3位清零後放入R0 |
5. Compare
| Code | Description |
|---|---|
| CMP R1, #10 | R1減去10後影響CPSR標誌位 |
| ADDGT R0, R0, #5 | 若R1>10, 則R0加上5 |
| CMN R0, R1 | R0-(-R1), 影響CPSR標誌位 |
| CMN R0, #10 | R0-(-10), 影響CPSR標誌位 |
| TST R1, #3 | 檢查第0位和第1位是否為1, 影響條件標誌位 |
| TEQ R1, R2 | R1與R2按位異或, 影響CPSR標誌位 |
6. Multiply
| Code | Description |
|---|---|
| MUL R0, R1, R2 | R1乘以R2後, 值放入R0 |
| MULS R0, R1, R2 | R1乘以R2後, 值放入R0並更新狀態標誌位 |
| MLA R0, R1, R2, R3 | R1乘以R2再加上R3後, 值放入R0 |
| MLAS R0, R1, R2, R3 | R1乘以R2再加上R3後, 值放入R0並更新狀態標誌位 |
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