contains invalid call from '~PRES8 (The user did n......

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按照提示，可以将原来的代码作一些修改，主要是STMFD的寄存器个数改为偶数个，还要对代码段加上PRESERVE 8的限定。

把ARM资料提供的更改方法列在下面：

There are two possible solutions to work-around this issue:

1) Rebuild all your objects/libraries using RVCT 2.x.
If you have any assembler files, you will need to:

i) check that all instructions preserve 8-byte stack alignment, and if necessary, correct them. （保留8字节堆栈对齐）
e.g. change: 将进栈寄存器数由奇数个改为偶数个
           STMFD sp!, {r0-r3, lr} ; push an odd number of registers
to
           STMFD sp!, {r0-r3, r12, lr} ; push an even number of registers
and:

ii) add the PRESERVE8 directive to the top of each assembler file. 将PRESERVE8保留字加在每个汇编文件前
e.g. change:
         AREA Init, CODE, READONLY
to:
         PRESERVE8
         AREA Init, CODE, READONLY

(the PRES8 attribute applies to the whole object, not just the code section).

PRESERVE8 这是字节对齐关键词，以前用ADS编译器的时候可以不用，但是后来的keil编译器时需要加上

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