LDMIA (Thumb*) - 多重載入之後遞增
語法
LDMIA startreg!, reg {, reglist }
其中：
|
startreg |
包含起始地址的暫存器 |
|
! |
啟用基址暫存器寫回； |
|
reg |
要載入的有效暫存器 |
說明
LDMIA 指令載入 reg 指定的部分、甚至全部通用暫存器。reg 指定的暫存器按照升序從自低到高的記憶體地址進行載入。startreg 按載入的暫存器數的四倍遞增。必須在暫存器列表中指定至少一個暫存器，否則結果將會“無法預知”。
備註
如果試圖進行無效的載入或儲存數據訪問，則產生數據終止異常。如果實現系統控制協處理器時啟用對齊檢查，並且存在位 0..1 != 0b00 的地址，則產生對齊異常。
定址模式
無運算元。影響的標誌
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N |
Z |
C |
V |
Q |
S |
I |
F |
T |
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15 |
14 |
13 |
12 |
11 |
10 |
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8 |
7 |
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0 |
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1 |
1 |
0 |
0 |
1 |
startreg |
reglist |
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示例
1 @.text
2 @.globl funldm
3 @.align 0
4 ;
5 AREA example,CODE,READONLY
6 CODE16
7
8 label1
9 ; Load a block of registers R1, R2,
10 ; R4, R5, R6 and R7 from memory
11 ; starting at address held in R3.
12 ; R3 is incremented by 4*6 bytes.
13 ; Note: Registers loaded in their
14 ; numeric order, not as specified.
15 ; That is, R1 is loaded first from
16 ; lowest memory address i.e. [R3]
17 00000000 CBF6 LDMIA R3!, {R2,R4-R7,R1}
18
19
20
21 ; Load a block of registers R1, R2,
22 ; R3 and R7 from memory, starting
23 ; at address held in R3.
24 ; Since R3 is in reg list to be
25 ; loaded, it retains its loaded value
26 ; and is not updated
27 00000002 CB8E LDMIA R3!, {R1-R3,R7}