I'm using freeRTOS CMSIS v1 in a STM32 with a cortex-M7 architecture. My goal in the moment is to study it and understand the "behind the curtain" mechanism (I'm using the debugger for this purpose).

I'm trying to reach the "context-switch" function, but I've not been able to get there. Is it possible to reach it? To see the source code?.

thanks!!

CodePudding user response：

It is an exception handler routine (supervisior call handler):

void xPortPendSVHandler( void )
{
    /* This is a naked function. */

    __asm volatile
    (
    "   mrs r0, psp                         \n"
    "   isb                                 \n"
    "                                       \n"
    "   ldr r3, pxCurrentTCBConst           \n" /* Get the location of the current TCB. */
    "   ldr r2, [r3]                        \n"
    "                                       \n"
    "   tst r14, #0x10                      \n" /* Is the task using the FPU context?  If so, push high vfp registers. */
    "   it eq                               \n"
    "   vstmdbeq r0!, {s16-s31}             \n"
    "                                       \n"
    "   stmdb r0!, {r4-r11, r14}            \n" /* Save the core registers. */
    "   str r0, [r2]                        \n" /* Save the new top of stack into the first member of the TCB. */
    "                                       \n"
    "   stmdb sp!, {r0, r3}                 \n"
    "   mov r0, %0                          \n"
    "   msr basepri, r0                     \n"
    "   dsb                                 \n"
    "   isb                                 \n"
    "   bl vTaskSwitchContext               \n"
    "   mov r0, #0                          \n"
    "   msr basepri, r0                     \n"
    "   ldmia sp!, {r0, r3}                 \n"
    "                                       \n"
    "   ldr r1, [r3]                        \n" /* The first item in pxCurrentTCB is the task top of stack. */
    "   ldr r0, [r1]                        \n"
    "                                       \n"
    "   ldmia r0!, {r4-r11, r14}            \n" /* Pop the core registers. */
    "                                       \n"
    "   tst r14, #0x10                      \n" /* Is the task using the FPU context?  If so, pop the high vfp registers too. */
    "   it eq                               \n"
    "   vldmiaeq r0!, {s16-s31}             \n"
    "                                       \n"
    "   msr psp, r0                         \n"
    "   isb                                 \n"
    "                                       \n"
    #ifdef WORKAROUND_PMU_CM001 /* XMC4000 specific errata workaround. */
        #if WORKAROUND_PMU_CM001 == 1
    "           push { r14 }                \n"
    "           pop { pc }                  \n"
        #endif
    #endif
    "                                       \n"
    "   bx r14                              \n"
    "                                       \n"
    "   .align 4                            \n"
    "pxCurrentTCBConst: .word pxCurrentTCB  \n"
    ::"i"(configMAX_SYSCALL_INTERRUPT_PRIORITY)
    );
}