assembly - 了解 ARM 汇编代码

Question

谁能向我解释一下这个短程序是做什么的？

ORIGIN 0x1000
one DEFW 13
two DEFW 29
three DEFW 0
ORIGIN 0x1010
ENTRY
ADR R0, one
LDR R1, [R0]
LDR R2, [R0, #4]
ADD R1, R2, R1
STR R1, [R0, #8]
SWI 2

如果我的想法正确，它会将“一”添加到“二”并将结果放在“三”中。我对么？

Answer 1

是的。

ORIGIN 0x1000          # Start at address 0x1000
one DEFW 13            # Allocate 4-bytes of space for a variable called one and set it to 13
two DEFW 29            # Allocate 4-bytes of space for a variable called two and set it to 29
three DEFW 0           # Allocate 4-bytes of space for a variable called three and set it to 0
ORIGIN 0x1010          # Skip ahead to address 0x1010 (this really leaves a 4-byte gap)
ENTRY                  # Mark next instruction as the begining of program
ADR R0, one            # Load address of one into R0
LDR R1, [R0]           # Load contents of one (pointed to but R0) into R1
LDR R2, [R0, #4]       # Load contents of two (pointed to but R0 + 4) into R2
ADD R1, R2, R1         # R1 = R2 + R1
STR R1, [R0, #8]       # Store R1 into three  (pointed to but R0 + 8)
SWI 2                  # Execute a software interrupt

或者

three = one + two

不确定“SWI 2”可能是特定于您的平台的。也许只是程序调用的通用结束。