LDM(1) - 多重載入

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 [01:0] != 0b00 的地址，則產生對齊異常。

定址模式

示例

1                @.text
2                @.globl funldm
3                @.align 0
4                @ **** LDM (Addressing Mode 4) ****
5                ;
6                ; Load multiple registers from base
7                ; address held in R8, increment this
8                ; base address before each use &
9                ; update R8 finally at end
10               ;
11                   AREA example,CODE,READONLY
12
13                   label1
14
15   00000000   F3B4D678   MOV     R8, #OxA
16   00000004   E9B800F3   LDMIB   R8!, {R1,R0,R4-R7}
17
18
19               ; -----------------------------------
20               ; Example 2 shows pushing registers
21               ; R0 thru R7 onto stack, together with
22               ; the Link Register, at entry to a
23               ; subroutine.
24               ;
25               ; Then at end of subroutine POP these
26               ; same resisters off stack, and place
27               ; the value of Link Reg onto PC causing
28               ; a return to calling program
29
30
31                   AREA example,CODE,READONLY
32
33                   label1a
34   00000008   E8AD40FF   STMFD   R13!, {R0-R7,LR}
35   00000012   E8BD80FF   LDMFD   R13!, {R0-R7,PC}

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