我注意到一些不正确的事情。当调用例程 (SWI) 时，可以更改寄存器，因此您应该将值保存在您正在使用的寄存器中 (push {r1, r2, r6, lr}) 并在例程 (pop {r1, r2, r6, lr}) 之后恢复它们，期望 r1 和 r2。 AND 指令不是一个好的加法器，请使用 add。在_loop: 中有一个额外的SWI 0 指令。在_write:中需要有character的地址在寄存器r1中，并且要写入的数据需要在内存中标记为character作为可打印字符（0x00000001不是可打印字符，添加0x30或十进制48 将使其成为可打印字符）。
我对您的程序的修改是小写的。如果您希望使用gdb，我将main 添加到顶部。我跳过/绕过了输入并对输入进行了硬编码。
.global _start
main:
_start:
@MOV R7, #3 @ Syscall read from keyboard
@MOV R0, #0 @ Input stream keyboard
@MOV R2, #1 @ Read 1 characters
@LDR R1, =character @ Put number in R1
@MOV R6,R1 @Holding value of R1 i.e. the input number 'n'
@MOV R1,#0 @initialiing value
@MOV R2, #1 @counter
@SWI 0
mov r6, #5
mov r1, #0
mov r2, #1
_loop:
@AND R1, R1, R2 @Add one to each value of R1
add r1, r1, r2
B _write @print the value
@SWI 0
_write:
push {r1, r2, r6, lr}
add r3, r1, #48
ldr r0, =character
str r3, [r0]
MOV R7,#4 @ Syscall for output
MOV R0,#1 @ Output stream for R1
ldr r1, =character
MOV R2,#1
SWI 0
pop {r1, r2, r6, lr}
CMP R1,R6 @Compare if the value is equal to 'n'
BNE _loop @if less than, then add again and print
end:
MOV R7,#1
SWI 0
.data
character:
.word 0
组装、链接和输出
as -o count2.o count2.s
ld -o count2 count2.o
./count2
12345
补充：
我没有使用过 QEMU，但是查看https://azeria-labs.com/load-and-store-multiple-part-5/ 我认为问题可能是访问内存存储。试试这个，看看它是否有所作为。我还更改了push 和pop 指令。
.global _start
_start:
@MOV R7, #3 @ Syscall read from keyboard
@MOV R0, #0 @ Input stream keyboard
@MOV R2, #1 @ Read 1 characters
@LDR R1, =character @ Put number in R1
@MOV R6,R1 @Holding value of R1 i.e. the input number 'n'
@MOV R1,#0 @initialiing value
@MOV R2, #1 @counter
@SWI 0
mov r6, #5
mov r1, #0
mov r2, #1
_loop:
@AND R1, R1, R2 @Add one to each value of R1
add r1, r1, r2
B _write @print the value
@SWI 0
_write:
@push {r1, r2, r6, lr}
stmdb sp!, {r1, r2, r6, lr}
add r3, r1, #48
@ldr r0, =character
ldr r0, character_address
str r3, [r0]
MOV R7,#4 @ Syscall for output
MOV R0,#1 @ Output stream for R1
@ldr r1, =character
ldr r1, character_address
MOV R2,#1
SWI 0
@pop {r1, r2, r6, lr}
ldmia sp!, {r1, r2, r6, lr}
CMP R1,R6 @Compare if the value is equal to 'n'
BNE _loop @if less than, then add again and print
end:
MOV R7,#1
SWI 0
character_address:
.word character
.data
character:
.word 0