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zephyr/arch/arm/include/offsets_short_arch.h

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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>
2016-11-08 23:36:50 +08:00
/*
* Copyright (c) 2016 Wind River Systems, Inc.
*
license: Replace Apache boilerplate with SPDX tag Replace the existing Apache 2.0 boilerplate header with an SPDX tag throughout the zephyr code tree. This patch was generated via a script run over the master branch. Also updated doc/porting/application.rst that had a dependency on line numbers in a literal include. Manually updated subsys/logging/sys_log.c that had a malformed header in the original file. Also cleanup several cases that already had a SPDX tag and we either got a duplicate or missed updating. Jira: ZEP-1457 Change-Id: I6131a1d4ee0e58f5b938300c2d2fc77d2e69572c Signed-off-by: David B. Kinder <david.b.kinder@intel.com> Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
2017-01-19 09:01:01 +08:00
* SPDX-License-Identifier: Apache-2.0
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>
2016-11-08 23:36:50 +08:00
*/
#ifndef _offsets_short_arch__h_
#define _offsets_short_arch__h_
#include <offsets.h>
/* kernel */
/* nothing for now */
/* end - kernel */
/* threads */
#define _thread_offset_to_basepri \
(___thread_t_arch_OFFSET + ___thread_arch_t_basepri_OFFSET)
kernel/arm: fix race condition when setting _Swap() return value There was a possible race condition when setting the return value of a thread that is pending, from an ISR. A kernel function causes a thread to pend, with the following series of steps: - disable interrupts - move current thread to wait_q - call _Swap Depending if running on M3/4 or M0+, _Swap will either issue a svc #0, or pend PendSV directly. The same problem exists in both cases. M3/4: __svc will: - enable interrupts - trigger __pendsv M0+: _Swap() will enable interrupts. __pendsv will: - save register context including PSP into the thread struct If an interrupt occurs between interrupts being enabled them and __pendsv saving PSP, and the ISR sets the pending thread's return value, this will happen: - sees the thread in a wait_q - removes it - makes it ready - calls _set_thread_return_value - _set_thread_return_value looks at the thread's saved PSP to poke the value In this scenario, PSP hasn't yet been updated by __pendsv so it's a stale value from the previous context switch, resulting in unpredictable word on the stack getting set to the return value. There is no way to fix this issue and still have the return value being delivered directly in the pending thread's exception stack frame, in the M0+ case. There will always be a window between the unlocking of interrupts and PendSV being handled. On M3/4, it could be possible with the mix of SVC and PendSV, since the exception stack frame is created in the __svc handler. However, because we want to keep the two implementations as close as possible, and there were talks of moving M3/4 to using PendSV only, to save an exception, the approach taken solves both cases. The approach taken is similar to the ARC and Nios2 ports, where there is a field in the thread structure that holds the return value. _Swap() then loads r0/a1 with that value just before returning. Fixes ZEP-1289. Change-Id: Iee7e06fe3f8ded84aff918fd43408c7f589344d9 Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
2016-11-16 07:45:43 +08:00
#define _thread_offset_to_swap_return_value \
(___thread_t_arch_OFFSET + ___thread_arch_t_swap_return_value_OFFSET)
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>
2016-11-08 23:36:50 +08:00
#define _thread_offset_to_preempt_float \
(___thread_t_arch_OFFSET + ___thread_arch_t_preempt_float_OFFSET)
/* end - threads */
#endif /* _offsets_short_arch__h_ */