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cgccmakefile

Eroror compiling builtin asm

I recently switched from Keil µVision to my own Makefile. I have an issue compiling a file port.c,

The function in the file:

__asm void vPortSVCHandler( void )
{
    PRESERVE8

    /* Get the location of the current TCB. */
    ldr r3, =pxCurrentTCB
    ldr r1, [r3]
    ldr r0, [r1]
    /* Pop the core registers. */
    ldmia r0!, {r4-r11, r14}
    msr psp, r0
    isb
    mov r0, #0
    msr basepri, r0
    bx r14
}

When compiling I get these errors:

../port.c:52:7: error: expected '(' before 'void'
   52 | __asm void vPortSVCHandler( void )
      |       ^~~~
      |       (
../port.c:64:13: error: stray '#' in program
   64 |     mov r0, #0

Am I missing an include or a compiler option?

Solution

  • You use gcc and gcc does not have "asm" functions.

    You need to write it in the assembler or write the inline assembly. __asm is also not valid gcc keyword.

    https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html