162 lines
4.6 KiB
C
162 lines
4.6 KiB
C
/* swap_macros.h - helper macros for context switch */
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/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef _SWAP_MACROS__H_
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#define _SWAP_MACROS__H_
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#include <kernel_structs.h>
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#include <offsets_short.h>
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#include <toolchain.h>
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#include <arch/cpu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef _ASMLANGUAGE
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/* entering this macro, current is in r2 */
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.macro _save_callee_saved_regs
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sub_s sp, sp, ___callee_saved_stack_t_SIZEOF
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/* save regs on stack */
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st_s r13, [sp, ___callee_saved_stack_t_r13_OFFSET]
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st_s r14, [sp, ___callee_saved_stack_t_r14_OFFSET]
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st_s r15, [sp, ___callee_saved_stack_t_r15_OFFSET]
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st r16, [sp, ___callee_saved_stack_t_r16_OFFSET]
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st r17, [sp, ___callee_saved_stack_t_r17_OFFSET]
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st r18, [sp, ___callee_saved_stack_t_r18_OFFSET]
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st r19, [sp, ___callee_saved_stack_t_r19_OFFSET]
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st r20, [sp, ___callee_saved_stack_t_r20_OFFSET]
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st r21, [sp, ___callee_saved_stack_t_r21_OFFSET]
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st r22, [sp, ___callee_saved_stack_t_r22_OFFSET]
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st r23, [sp, ___callee_saved_stack_t_r23_OFFSET]
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st r24, [sp, ___callee_saved_stack_t_r24_OFFSET]
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st r25, [sp, ___callee_saved_stack_t_r25_OFFSET]
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st r26, [sp, ___callee_saved_stack_t_r26_OFFSET]
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st fp, [sp, ___callee_saved_stack_t_fp_OFFSET]
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st r30, [sp, ___callee_saved_stack_t_r30_OFFSET]
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/* save stack pointer in struct tcs */
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st sp, [r2, _thread_offset_to_sp]
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.endm
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/* entering this macro, current is in r2 */
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.macro _load_callee_saved_regs
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/* restore stack pointer from struct tcs */
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ld sp, [r2, _thread_offset_to_sp]
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ld_s r13, [sp, ___callee_saved_stack_t_r13_OFFSET]
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ld_s r14, [sp, ___callee_saved_stack_t_r14_OFFSET]
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ld_s r15, [sp, ___callee_saved_stack_t_r15_OFFSET]
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ld r16, [sp, ___callee_saved_stack_t_r16_OFFSET]
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ld r17, [sp, ___callee_saved_stack_t_r17_OFFSET]
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ld r18, [sp, ___callee_saved_stack_t_r18_OFFSET]
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ld r19, [sp, ___callee_saved_stack_t_r19_OFFSET]
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ld r20, [sp, ___callee_saved_stack_t_r20_OFFSET]
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ld r21, [sp, ___callee_saved_stack_t_r21_OFFSET]
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ld r22, [sp, ___callee_saved_stack_t_r22_OFFSET]
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ld r23, [sp, ___callee_saved_stack_t_r23_OFFSET]
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ld r24, [sp, ___callee_saved_stack_t_r24_OFFSET]
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ld r25, [sp, ___callee_saved_stack_t_r25_OFFSET]
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ld r26, [sp, ___callee_saved_stack_t_r26_OFFSET]
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ld fp, [sp, ___callee_saved_stack_t_fp_OFFSET]
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ld r30, [sp, ___callee_saved_stack_t_r30_OFFSET]
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add_s sp, sp, ___callee_saved_stack_t_SIZEOF
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.endm
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/*
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* Must be called with interrupts locked or in P0.
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* Upon exit, sp will be pointing to the stack frame.
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*/
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.macro _create_irq_stack_frame
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sub_s sp, sp, ___isf_t_SIZEOF
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st blink, [sp, ___isf_t_blink_OFFSET]
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/* store these right away so we can use them if needed */
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st_s r13, [sp, ___isf_t_r13_OFFSET]
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st_s r12, [sp, ___isf_t_r12_OFFSET]
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st r11, [sp, ___isf_t_r11_OFFSET]
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st r10, [sp, ___isf_t_r10_OFFSET]
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st r9, [sp, ___isf_t_r9_OFFSET]
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st r8, [sp, ___isf_t_r8_OFFSET]
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st r7, [sp, ___isf_t_r7_OFFSET]
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st r6, [sp, ___isf_t_r6_OFFSET]
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st r5, [sp, ___isf_t_r5_OFFSET]
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st r4, [sp, ___isf_t_r4_OFFSET]
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st_s r3, [sp, ___isf_t_r3_OFFSET]
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st_s r2, [sp, ___isf_t_r2_OFFSET]
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st_s r1, [sp, ___isf_t_r1_OFFSET]
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st_s r0, [sp, ___isf_t_r0_OFFSET]
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mov r0, lp_count
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st_s r0, [sp, ___isf_t_lp_count_OFFSET]
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lr r1, [_ARC_V2_LP_START]
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lr r0, [_ARC_V2_LP_END]
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st_s r1, [sp, ___isf_t_lp_start_OFFSET]
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st_s r0, [sp, ___isf_t_lp_end_OFFSET]
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.endm
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/*
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* Must be called with interrupts locked or in P0.
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* sp must be pointing the to stack frame.
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*/
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.macro _pop_irq_stack_frame
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ld blink, [sp, ___isf_t_blink_OFFSET]
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ld_s r0, [sp, ___isf_t_lp_count_OFFSET]
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mov lp_count, r0
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ld_s r1, [sp, ___isf_t_lp_start_OFFSET]
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ld_s r0, [sp, ___isf_t_lp_end_OFFSET]
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sr r1, [_ARC_V2_LP_START]
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sr r0, [_ARC_V2_LP_END]
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ld_s r13, [sp, ___isf_t_r13_OFFSET]
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ld_s r12, [sp, ___isf_t_r12_OFFSET]
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ld r11, [sp, ___isf_t_r11_OFFSET]
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ld r10, [sp, ___isf_t_r10_OFFSET]
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ld r9, [sp, ___isf_t_r9_OFFSET]
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ld r8, [sp, ___isf_t_r8_OFFSET]
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ld r7, [sp, ___isf_t_r7_OFFSET]
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ld r6, [sp, ___isf_t_r6_OFFSET]
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ld r5, [sp, ___isf_t_r5_OFFSET]
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ld r4, [sp, ___isf_t_r4_OFFSET]
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ld_s r3, [sp, ___isf_t_r3_OFFSET]
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ld_s r2, [sp, ___isf_t_r2_OFFSET]
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ld_s r1, [sp, ___isf_t_r1_OFFSET]
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ld_s r0, [sp, ___isf_t_r0_OFFSET]
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/*
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* All gprs have been reloaded, the only one that is still usable is
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* ilink.
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*
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* The pc and status32 values will still be on the stack. We cannot
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* pop them yet because the callers of _pop_irq_stack_frame must reload
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* status32 differently depending on the execution context they are
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* running in (_Swap(), firq or exception).
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*/
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add_s sp, sp, ___isf_t_SIZEOF
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.endm
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#endif /* _ASMLANGUAGE */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SWAP_MACROS__H_ */
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