Keil MDK 编译出现的警告和错误解决

warning: A1876W: Use of '|' as a synonym for the :OR: operator is deprecated.
部分源代码：
MSR CPSR_c, #(NoInt|IRQ32Mode) ;进入IRQ模式。

解决方法：把"|"修改为 ":OR:", 如下

MSR CPSR_c, #NoInt:OR:IRQ32Mode ;进入IRQ模式。

warning: A1608W: MOV pc,<rn> instruction used, but BX <rn> is preferred

解决方法：把MOV pc, <rn> 替换为 BX <rn>

Error: L6238E: os_cpu_a.o(subr) contains invalid call from '~PRES8 (The user did not require code to preserve 8-byte aligment of 8-byte data objects)' function to 'REQ8 (Code was permitted to depend on the 8-byte aligment
of 8-byte data items)' function OSIntExit.

解决方法：在汇编程序前面加上 PRESERVE8
PRESERVE8

AREA |subr|, CODE, READONLY

IMPORT OSIntNesting

IMPORT OSTCBCur

IMPORT IsrIRQ
…………

warning: A1085W: Forced user-mode LDM/STM must not be followed by use of banked R8-R14

部分源代码:

STMFD SP,{R3,SP,LR}^ ;系统模式SP→|R0 |

SUB SP,SP,#12 ;系统模式SP→|SPSR|

解决方法：在两行语句中间加nop，即可解决warning
STMFD SP,{R3,SP,LR}^ ;系统模式SP→|R0 |

nop

SUB SP,SP,#12 ;系统模式SP→|SPSR|

error: L6236E: No section matches selector - no section to be FIRST/LAST.

部分源代码：

RuninFlash.sct

LR_ROM1 0x00000000

{ ; load region

ER_ROM1 0x00000000 0x0200000

{ ; load address = execution address

*.o (RESET, +First) ;报错的地方

*(InRoot$$Sections)

.ANY (+RO)

}

RW_RAM1 0x0C000000 0x800000

{ ; RW data

.ANY (+RW +ZI)

}

}

解决方法：

在启动文件，我的是44binit.s 中找到

AREA Init,CODE,READONLY

改为

AREA RESET,CODE,READONLY