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对于 ARM 大小端模式和 CPU 无关还是编译器无关
论断，ARM 大小端模式和 CPU 无关也和编译器有关系。
ARM 默认状态配置为小端模式，编译器不指定编译模式也默认是小端模式。但有些 ARM 是能够配置为大端模式的。例如：
- ARMv7-R: SCTLR.IE, bit[31], that indicates the instruction endianness configuration.
- ARMv7-A: In ARMv7-A, the mapping of instruction memory is always little-endian.
- ARMv8: This data endianness is controlled independently for each Execution level. For EL3, EL2 and EL1, the relevant register of SCTLR_ELn
如果在 ARM 下面配置了大端模式，gcc 编译器则须要减少参数 -mbig-endian
-mlittle-endian
Generate code for a processor running in little-endian mode. This is the default for all standard configurations.
-mbig-endian
Generate code for a processor running in big-endian mode; the default is to compile code for a little-endian processor.与 CPU 配置保持一致。
参考文献：
https://gcc.gnu.org/onlinedoc…
https://developer.arm.com/doc…
https://developer.arm.com/doc…
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