ChibiOS Free Embedded RTOS

__port_switch:
push {r4, r5, r6, r7, r8, r9, r10, r11, lr}
#if CORTEX_USE_FPU
/* Saving FPU context.*/
vpush {s16-s31}
#endif

str sp, [r1, #CONTEXT_OFFSET]
#if (CORTEX_SIMPLIFIED_PRIORITY == FALSE) && \
((CORTEX_MODEL == 3) || (CORTEX_MODEL == 4))
/* Workaround for ARM ...

Hi,

In that port the context switch is performed synchronously and without entering an exception state, look at the asm implementation of port_switch(). It just stacks/unstacks all the EABI function-preserved registers and swap stacks.

Note that there are 2 distinct ARMv7-M ports, the alternate ...

hi, I'm new to ChibiOS and learning about the magic kernel core of ChibiOS, we know the very important part is about context switch mechanism.


But when I study into the API for chSemWait , I have some doubts and get confused, as I see the calling archetecture:
chSemWait-->chSemWaitS ...