在C中嵌套汇编代码难吗？

#if   defined ( __CC_ARM )  #define __ASM            __asm                                      /*!< asm keyword for ARM Compiler          */  #define __INLINE         __inline                                   /*!< inline keyword for ARM Compiler       */  #define __STATIC_INLINE  static __inline
#elif defined ( __GNUC__ )  #define __ASM            __asm                                      /*!< asm keyword for GNU Compiler          */  #define __INLINE         inline                                     /*!< inline keyword for GNU Compiler       */  #define __STATIC_INLINE  static inline
#elif defined ( __ICCARM__ )  #define __ASM            __asm                                      /*!< asm keyword for IAR Compiler          */  #define __INLINE         inline                                     /*!< inline keyword for IAR Compiler. Only available in High optimization mode! */  #define __STATIC_INLINE  static inline
#elif defined ( __TMS470__ )  #define __ASM            __asm                                      /*!< asm keyword for TI CCS Compiler       */  #define __STATIC_INLINE  static inline
#elif defined ( __TASKING__ )  #define __ASM            __asm                                      /*!< asm keyword for TASKING Compiler      */  #define __INLINE         inline                                     /*!< inline keyword for TASKING Compiler   */  #define __STATIC_INLINE  static inline
#elif defined ( __CSMC__ )  #define __packed  #define __ASM            _asm                                      /*!< asm keyword for COSMIC Compiler      */  #define __INLINE         inline                                    /*use -pc99 on compile line !< inline keyword for COSMIC Compiler   */  #define __STATIC_INLINE  static inline#endif

#pragma asm
; Assembler Code Here
#pragma endasm

__ASM uint32_t __get_PSP(void){  mrs r0, psp  bx lr}

uint32_t __get_PSP(void){  __ASM("mrs r0, psp");  __ASM("bx lr");}

static portFORCE_INLINE void vPortRaiseBASEPRI( void ){uint32_t ulNewBASEPRI = configMAX_SYSCALL_INTERRUPT_PRIORITY;
  __asm  {    /* Set BASEPRI to the max syscall priority to effect a critical section. */    msr basepri, ulNewBASEPRI    dsb    isb  }}

__asm void xPortPendSVHandler( void ){  extern uxCriticalNesting;  extern pxCurrentTCB;  extern vTaskSwitchContext;
  PRESERVE8
  mrs r0, psp  isb
  ldr  r3, =pxCurrentTCB    /* Get the location of the current TCB. */  ldr  r2, [r3]
  stmdb r0!, {r4-r11}      /* Save the remaining registers. */  str r0, [r2]        /* Save the new top of stack into the first member of the TCB. */
  stmdb sp!, {r3, r14}  mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY  msr basepri, r0  dsb  isb  bl vTaskSwitchContext  mov r0, #0  msr basepri, r0  ldmia sp!, {r3, r14}
  ldr r1, [r3]  ldr r0, [r1]        /* The first item in pxCurrentTCB is the task top of stack. */  ldmia r0!, {r4-r11}      /* Pop the registers and the critical nesting count. */  msr psp, r0  isb  bx r14  nop}

__asm void NVIC_CoreReset_a(void){  LDR R0, =0xE000ED0C  LDR R1, =0x05FA0001  STR R1, [R0]deadloop_Core  B deadloop_Core}