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arch: arm: update function documentation for __svc

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Fixing the documentation for ARM core __svc function, which was
outdated and present only for the ARMv7-M version.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2019-02-11 11:07:58 +01:00 • committed by Kumar Gala
commit 533cfa18fa
2 changed files with 17 additions and 4 deletions
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19
arch/arm/core/swap_helper.S
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@ -258,6 +258,17 @@ _thread_irq_disabled:
bx lr
#if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE)
/**
*
* @brief Service call handler
*
* The service call (svc) is used in the following occasions:
* - IRQ offloading
* - Kernel run-time exceptions
*
* @return N/A
*/
SECTION_FUNC(TEXT, __svc)
/* Use EXC_RETURN state to find out if stack frame is on the
* MSP or PSP
@ -305,16 +316,18 @@ _oops:
pop {r0, pc}
#elif defined(CONFIG_ARMV7_M_ARMV8_M_MAINLINE)
/**
*
* @brief Service call handler
*
* The service call (svc) is only used in __swap() to enter handler mode so we
* can go through the PendSV exception to perform a context switch.
* The service call (svc) is used in the following occasions:
* - IRQ offloading
* - Kernel run-time exceptions
* - System Calls (User mode)
*
* @return N/A
*/
SECTION_FUNC(TEXT, __svc)
tst lr, #0x4 /* did we come from thread mode ? */
ite eq /* if zero (equal), came from handler mode */