On 9/14/23 06:48, Xin Li wrote:
+ /* + * Don't check the FRED stack level, the call stack leading to this + * helper is effectively constant and shallow (relatively speaking).
It's more that we don't need to protect from reentrancy. The external interrupt uses stack level 0 so no adjustment would be needed anyway, and NMI does not use an IST even in the non-FRED case.
+ * Emulate the FRED-defined redzone and stack alignment. + */ + sub $(FRED_CONFIG_REDZONE_AMOUNT << 6), %rsp + and $FRED_STACK_FRAME_RSP_MASK, %rsp
