Question

我想在uVision中使用STM32F进行简单的内联汇编实验，如以下代码所示。

但是当我编译它时，我遇到了一些错误信息。

unsigned int bar(unsigned int r0)

{
  unsigned int r1;
  unsigned int r4 = 1234;
__asm
{


    MOVS  r0,#0
    LDR   r1,[r0]     ; Get initial MSP value
    MOV   SP, r1
    LDR   r1,[r0, #4] ; Get initial PC value
    BX    r1
}

  return(r1);

}

我在编译时遇到以下错误消息。

*** Using Compiler 'V5.06 update 5 (build 528)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'STM32F429_439xx'
compiling main.c...
../main.c(79): error:  #3061: unrecognized instruction opcode
                                LDR   r1,[r0]     ; Get initial MSP value
../main.c(80): error:  #20: identifier "SP" is undefined
                                MOV   SP, r1
../main.c(81): error:  #3061: unrecognized instruction opcode
                                LDR   r1,[r0, #4] ; Get initial PC value
../main.c(82): error:  #1084: This instruction not permitted in inline assembler
                                BX    r1
../main.c(71): warning:  #177-D: variable "r4"  was declared but never referenced
    unsigned int r4 = 1234;
../main.c(82): error:  #114: label "r1"  was referenced but not defined
                                BX    r1
../main.c: 1 warning, 5 errors
"STM32F429_439xx\STM32F429_439xx.axf" - 5 Error(s), 1 Warning(s).
Target not created.
Build Time Elapsed:  00:00:01

我该怎么做才能解决这个问题？

我们如何在c中检查inline-assembly中的寄存器值？

0 个答案: