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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * Vineetg: Aug 2009
- * -Moved core context switch macro out of entry.S into this file.
- * -This is the more "natural" hand written assembler
- */
- #include <linux/linkage.h>
- #include <asm/entry.h> /* For the SAVE_* macros */
- #include <asm/asm-offsets.h>
- ; IN
- ; - r0: prev task (also current)
- ; - r1: next task
- ; OUT
- ; - r0: prev task (so r0 not touched)
- .section .sched.text,"ax",@progbits
- ENTRY_CFI(__switch_to)
- /* save kernel stack frame regs of @prev task */
- push blink
- CFI_DEF_CFA_OFFSET 4
- CFI_OFFSET r31, -4
- push fp
- CFI_DEF_CFA_OFFSET 8
- CFI_OFFSET r27, -8
- mov fp, sp
- CFI_DEF_CFA_REGISTER r27
- /* kernel mode callee regs of @prev */
- SAVE_CALLEE_SAVED_KERNEL
- /*
- * save final SP to @prev->thread_info.ksp
- * @prev is "current" so thread_info derived from SP
- */
- GET_CURR_THR_INFO_FROM_SP r10
- st sp, [r10, THREAD_INFO_KSP]
- /* update @next in _current_task[] and GP register caching it */
- SET_CURR_TASK_ON_CPU r1, r10
- /* load SP from @next->thread_info.ksp */
- ld r10, [r1, TASK_THREAD_INFO]
- ld sp, [r10, THREAD_INFO_KSP]
- /* restore callee regs, stack frame regs of @next */
- RESTORE_CALLEE_SAVED_KERNEL
- pop fp
- CFI_RESTORE r27
- CFI_DEF_CFA r28, 4
- pop blink
- CFI_RESTORE r31
- CFI_DEF_CFA_OFFSET 0
- j [blink]
- END_CFI(__switch_to)
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