In the arm system, words, half words, and bytes are aligned with half words.

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Word: In the ARM architecture, the word length is 32 characters, while in the 8-bit/16-bit processor architecture, the word length is generally 16 characters.

Half-word: In the ARM architecture, the length of the half-word is 16 bits, which is consistent with the length of the word in the 8-bit/16-bit processor architecture. Byte: In the ARM architecture and 8-bit/16-bit processor architecture, the length of the byte is 8 bits.

Arm command line alignment: The address space corresponding to the 32-bit address is 2

32

8-bit bytes. If the initial address is 0x00000000, the next address should be 0x00000004. 0x00000000 ~ The four eight-byte corresponding to 0x00000003 is a word, 0x00000004 ~ 0x00000007 corresponds to the next word. Therefore, the bits of the address [1:0] = 0b00. That is, the address must be divisible by 4.

Semi-Word Alignment: The address bits [0] = 0b0.

In the arm system, words, half words, and bytes are aligned with half words.