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arch: arc: bug fixes and optimization in exception handling

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The original exception handling has space to optimize and
and some bugs need to be fixed.

* define NANO_ESF
   * add the definition of NANO_ESF which is an irq_stack_frame
   * add the corresponding codes in exception entry and handler
   * remove _default_esf
* implement the _ARCH_EXCEPT
   * use trap exception to raise exception by kernel
   * add corresponding trap exception entry
   * add _do_kernel_oops to handle the exception raised by
     _ARCH_EXCEPT.
* add the thread context switch in exception return
   * case: kernel oops may raise thread context switch
   * case: some tests will re-implement SysFatalHandler to raise
     thread context switch.
   * as the exception and isr are handled in kernel isr stack, so
     the thread context switch must be in the return of exception/isr
     , and the exception handler must return, should not be decorated
     with FUNC_NORETURN
* for arc, _is_in_isr should consider the case of exception

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2018-04-12 13:13:08 +08:00 • committed by Andrew Boie
commit 3d9ba10b5c
8 changed files with 132 additions and 110 deletions
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7
arch/arc/core/fault.c
View file

@ -29,7 +29,7 @@
*
* @return This function does not return.
*/
void _Fault(void)
void _Fault(const NANO_ESF *esf)
{
u32_t vector, code, parameter;
u32_t exc_addr = _arc_v2_aux_reg_read(_ARC_V2_EFA);
@ -47,8 +47,9 @@ void _Fault(void)
* check violation
*/
if (vector == 6 && parameter == 2) {
_NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, &_default_esf);
_NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, esf);
return;
}
#endif
_NanoFatalErrorHandler(_NANO_ERR_HW_EXCEPTION, &_default_esf);
_NanoFatalErrorHandler(_NANO_ERR_HW_EXCEPTION, esf);
}