xtensa/kernel/entry.S

94  * Save some special registers, extra states and all registers in the AR
161 	s32i	a2, a1, PT_WMASK	# needed for restoring registers
170 	/* Save only live registers. */
193 	/* Save the remaining registers.
194 	 * We have to save all registers up to the first '1' from
215 	extui	a2, a2, 0, 4		# mask for the first 16 registers
219 	/* Save 4 registers at a time */
250  * Save special registers and the live window frame.
346  * Save the remaining special registers, switch to kernel mode, and jump
353 	/* Save some registers, disable loops and clear the syscall flag. */
447 	/* Save optional registers. */
504 	 * and have to restore WB and WS, extra states, and all registers
569 	 * Restore optional registers.
570 	 * abi_arg* are used as temporary registers here.
603 	/* The working registers are a0 and a3.  We are restoring to
606 	 *       Y: number of registers saved in groups of 4
607 	 *       M: 4 bit mask of first 16 registers
622 	/* Clear unrestored registers (don't leak anything to user-land */
721 	/* Restore address registers. */
989  * active AR registers it won't cause an exception.
1309 	 * we have to save 4,8. or 12 registers.
1393 	/* Advance PC, restore registers and SAR, and return from exception. */
1400 	/* Restore clobbered registers. */
1415 	 * registers, so set up a dummy frame and kill the user application.
1471 	/* We need to make sure the current registers (a0-a3) are preserved.
1540 	/* When we return here, all registers have been restored (a2: DEPC) */
1697 	/* Restore the working registers, and return. */
1873 	/* Restore the working registers, and return. */
2000  * Spill live registers on the kernel stack macro.