riscv/kernel/entry.S

1 /* SPDX-License-Identifier: GPL-2.0-only */
14 #include <asm/asm-offsets.h>
35 	addi sp, sp, -(PT_SIZE_ON_STACK)
67 	 * Disable user-mode memory access as it should only be set in the
89 	 * Set the scratch register to 0, so that if a recursive exception
90 	 * occurs, the exception vector knows it came from the kernel
150 	/* Check if exception code lies within bounds */
159 	/* Recover a0 - a7 for system calls */
191 	 * Check if syscall is rejected by tracer, i.e., a7 == -1.
194 	li t1, -1
236 	REG_L s0, TASK_TI_FLAGS(tp) /* current_thread_info->flags */
270 	 * reservation, so instead here we clear any existing reservation --
277 	 * forward branch around an SC -- which is how we implement CAS.  As a
345 	/* Handle pending signals and notify-resume requests */
348 	move a1, s0 /* current_thread_info->flags */
391  * The callee-saved registers must be saved and restored.
400 	/* Save context into prev->thread */
418 	/* Restore context from next->thread */
436 	sw a3, TASK_TI_CPU(a1)
437 	sw a4, TASK_TI_CPU(a0)
448 	/* Exception vector table */