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zephyr/arch/arc/core/swap_macros.h
Benjamin Walsh f6ca7de09c kernel/arch: consolidate tTCS and TNANO definitions 
There was a lot of duplication between architectures for the definition
of threads and the "nanokernel" guts. These have been consolidated.

Now, a common file kernel/unified/include/kernel_structs.h holds the
common definitions. Architectures provide two files to complement it:
kernel_arch_data.h and kernel_arch_func.h. The first one contains at
least the struct _thread_arch and struct _kernel_arch data structures,
as well as the struct _callee_saved and struct _caller_saved register
layouts. The second file contains anything that needs what is provided
by the common stuff in kernel_structs.h. Those two files are only meant
to be included in kernel_structs.h in very specific locations.

The thread data structure has been separated into three major parts:
common struct _thread_base and struct k_thread, and arch-specific struct
_thread_arch. The first and third ones are included in the second.

The struct s_NANO data structure has been split into two: common struct
_kernel and arch-specific struct _kernel_arch. The latter is included in
the former.

Offsets files have also changed: nano_offsets.h has been renamed
kernel_offsets.h and is still included by the arch-specific offsets.c.
Also, since the thread and kernel data structures are now made of
sub-structures, offsets have to be added to make up the full offset.
Some of these additions have been consolidated in shorter symbols,
available from kernel/unified/include/offsets_short.h, which includes an
arch-specific offsets_arch_short.h. Most of the code include
offsets_short.h now instead of offsets.h.

Change-Id: I084645cb7e6db8db69aeaaf162963fe157045d5a
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-11-12 07:04:52 -05:00

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/* swap_macros.h - helper macros for context switch */
/*
* Copyright (c) 2014 Wind River Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _SWAP_MACROS__H_
#define _SWAP_MACROS__H_
#include <kernel_structs.h>
#include <offsets_short.h>
#include <toolchain.h>
#include <arch/cpu.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _ASMLANGUAGE
/* entering this macro, current is in r2 */
.macro _save_callee_saved_regs
sub_s sp, sp, ___callee_saved_stack_t_SIZEOF
/* save regs on stack */
st_s r13, [sp, ___callee_saved_stack_t_r13_OFFSET]
st_s r14, [sp, ___callee_saved_stack_t_r14_OFFSET]
st_s r15, [sp, ___callee_saved_stack_t_r15_OFFSET]
st r16, [sp, ___callee_saved_stack_t_r16_OFFSET]
st r17, [sp, ___callee_saved_stack_t_r17_OFFSET]
st r18, [sp, ___callee_saved_stack_t_r18_OFFSET]
st r19, [sp, ___callee_saved_stack_t_r19_OFFSET]
st r20, [sp, ___callee_saved_stack_t_r20_OFFSET]
st r21, [sp, ___callee_saved_stack_t_r21_OFFSET]
st r22, [sp, ___callee_saved_stack_t_r22_OFFSET]
st r23, [sp, ___callee_saved_stack_t_r23_OFFSET]
st r24, [sp, ___callee_saved_stack_t_r24_OFFSET]
st r25, [sp, ___callee_saved_stack_t_r25_OFFSET]
st r26, [sp, ___callee_saved_stack_t_r26_OFFSET]
st fp, [sp, ___callee_saved_stack_t_fp_OFFSET]
st r30, [sp, ___callee_saved_stack_t_r30_OFFSET]
/* save stack pointer in struct tcs */
st sp, [r2, _thread_offset_to_sp]
.endm
/* entering this macro, current is in r2 */
.macro _load_callee_saved_regs
/* restore stack pointer from struct tcs */
ld sp, [r2, _thread_offset_to_sp]
ld_s r13, [sp, ___callee_saved_stack_t_r13_OFFSET]
ld_s r14, [sp, ___callee_saved_stack_t_r14_OFFSET]
ld_s r15, [sp, ___callee_saved_stack_t_r15_OFFSET]
ld r16, [sp, ___callee_saved_stack_t_r16_OFFSET]
ld r17, [sp, ___callee_saved_stack_t_r17_OFFSET]
ld r18, [sp, ___callee_saved_stack_t_r18_OFFSET]
ld r19, [sp, ___callee_saved_stack_t_r19_OFFSET]
ld r20, [sp, ___callee_saved_stack_t_r20_OFFSET]
ld r21, [sp, ___callee_saved_stack_t_r21_OFFSET]
ld r22, [sp, ___callee_saved_stack_t_r22_OFFSET]
ld r23, [sp, ___callee_saved_stack_t_r23_OFFSET]
ld r24, [sp, ___callee_saved_stack_t_r24_OFFSET]
ld r25, [sp, ___callee_saved_stack_t_r25_OFFSET]
ld r26, [sp, ___callee_saved_stack_t_r26_OFFSET]
ld fp, [sp, ___callee_saved_stack_t_fp_OFFSET]
ld r30, [sp, ___callee_saved_stack_t_r30_OFFSET]
add_s sp, sp, ___callee_saved_stack_t_SIZEOF
.endm
/*
* Must be called with interrupts locked or in P0.
* Upon exit, sp will be pointing to the stack frame.
*/
.macro _create_irq_stack_frame
sub_s sp, sp, ___isf_t_SIZEOF
st blink, [sp, ___isf_t_blink_OFFSET]
/* store these right away so we can use them if needed */
st_s r13, [sp, ___isf_t_r13_OFFSET]
st_s r12, [sp, ___isf_t_r12_OFFSET]
st r11, [sp, ___isf_t_r11_OFFSET]
st r10, [sp, ___isf_t_r10_OFFSET]
st r9, [sp, ___isf_t_r9_OFFSET]
st r8, [sp, ___isf_t_r8_OFFSET]
st r7, [sp, ___isf_t_r7_OFFSET]
st r6, [sp, ___isf_t_r6_OFFSET]
st r5, [sp, ___isf_t_r5_OFFSET]
st r4, [sp, ___isf_t_r4_OFFSET]
st_s r3, [sp, ___isf_t_r3_OFFSET]
st_s r2, [sp, ___isf_t_r2_OFFSET]
st_s r1, [sp, ___isf_t_r1_OFFSET]
st_s r0, [sp, ___isf_t_r0_OFFSET]
mov r0, lp_count
st_s r0, [sp, ___isf_t_lp_count_OFFSET]
lr r1, [_ARC_V2_LP_START]
lr r0, [_ARC_V2_LP_END]
st_s r1, [sp, ___isf_t_lp_start_OFFSET]
st_s r0, [sp, ___isf_t_lp_end_OFFSET]
.endm
/*
* Must be called with interrupts locked or in P0.
* sp must be pointing the to stack frame.
*/
.macro _pop_irq_stack_frame
ld blink, [sp, ___isf_t_blink_OFFSET]
ld_s r0, [sp, ___isf_t_lp_count_OFFSET]
mov lp_count, r0
ld_s r1, [sp, ___isf_t_lp_start_OFFSET]
ld_s r0, [sp, ___isf_t_lp_end_OFFSET]
sr r1, [_ARC_V2_LP_START]
sr r0, [_ARC_V2_LP_END]
ld_s r13, [sp, ___isf_t_r13_OFFSET]
ld_s r12, [sp, ___isf_t_r12_OFFSET]
ld r11, [sp, ___isf_t_r11_OFFSET]
ld r10, [sp, ___isf_t_r10_OFFSET]
ld r9, [sp, ___isf_t_r9_OFFSET]
ld r8, [sp, ___isf_t_r8_OFFSET]
ld r7, [sp, ___isf_t_r7_OFFSET]
ld r6, [sp, ___isf_t_r6_OFFSET]
ld r5, [sp, ___isf_t_r5_OFFSET]
ld r4, [sp, ___isf_t_r4_OFFSET]
ld_s r3, [sp, ___isf_t_r3_OFFSET]
ld_s r2, [sp, ___isf_t_r2_OFFSET]
ld_s r1, [sp, ___isf_t_r1_OFFSET]
ld_s r0, [sp, ___isf_t_r0_OFFSET]
/*
* All gprs have been reloaded, the only one that is still usable is
* ilink.
*
* The pc and status32 values will still be on the stack. We cannot
* pop them yet because the callers of _pop_irq_stack_frame must reload
* status32 differently depending on the execution context they are running
* in (_Swap(), firq or exception).
*/
add_s sp, sp, ___isf_t_SIZEOF
.endm
#endif /* _ASMLANGUAGE */
#ifdef __cplusplus
}
#endif
#endif /* _SWAP_MACROS__H_ */
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