riscv/kernel/entry.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
16 #include <asm/asm-offsets.h>
36 	addi sp, sp, -(PT_SIZE_ON_STACK)
46 	addi sp, sp, -(PT_SIZE_ON_STACK)
53 	 * Disable user-mode memory access as it should only be set in the
118  *  - handle_exception
119  *  - ret_from_fork
153 	 * different hart contexts.  We can't actually save and restore a load
154 	 * reservation, so instead here we clear any existing reservation --
161 	 * forward branch around an SC -- which is how we implement CAS.  As a
199 	addi sp, sp, -(PT_SIZE_ON_STACK)
241  * Calls func(regs) using the per-CPU IRQ stack.
245 	addi	sp, sp, -STACKFRAME_SIZE_ON_STACK
250 	/* Switch to the per-CPU shadow call stack */
254 	/* Switch to the per-CPU IRQ stack and call the handler */
264 	addi	sp, s0, -STACKFRAME_SIZE_ON_STACK
275  * The callee-saved registers must be saved and restored.
284 	/* Save context into prev->thread */
304 	/* Restore context from next->thread */