1117169980
Due to the use of gperf to generate hash table for kobjects, the addresses of these kobjects cannot change during the last few phases of linking (especially between zephyr_prebuilt.elf and zephyr.elf). Because of this, the gperf generated data needs to be placed at the end of memory to avoid pushing symbols around in memory. This prevents moving these generated blocks to earlier sections, for example, pinned data section needed for demand paging. So create placeholders for use in intermediate linking to reserve space for these generated blocks. Due to uncertainty on the size of these blocks, more space is being reserved which could result in wasted space. Though, this retains the use of hash table for faster lookup. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
76 lines
1.9 KiB
Plaintext
76 lines
1.9 KiB
Plaintext
/*
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* Copyright (c) 2017,2021 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifdef CONFIG_USERSPACE
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z_kobject_data_begin = .;
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SECTION_DATA_PROLOGUE(kobject_data,,)
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{
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#if !defined(LINKER_ZEPHYR_PREBUILT) && \
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!defined(LINKER_ZEPHYR_FINAL)
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#ifdef CONFIG_DYNAMIC_OBJECTS
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PROVIDE(_thread_idx_map = .);
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. += CONFIG_MAX_THREAD_BYTES;
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#endif
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#endif /* !LINKER_ZEPHYR_PREBUILT && !LINKER_ZEPHYR_FINAL */
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/* During LINKER_KOBJECT_PREBUILT and LINKER_ZEPHYR_PREBUILT,
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* space needs to be reserved for the rodata that will be
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* produced by gperf during the final stages of linking.
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* The alignment and size are produced by
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* scripts/gen_kobject_placeholders.py. These are here
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* so the addresses to kobjects would remain the same
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* during the final stages of linking (LINKER_ZEPHYR_FINAL).
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*/
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#if defined(LINKER_ZEPHYR_PREBUILT)
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#include <linker-kobject-prebuilt-data.h>
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#ifdef CONFIG_DYNAMIC_OBJECTS
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/* This is produced by gperf. Put a place holder here
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* to avoid compilation error.
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*/
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PROVIDE(_thread_idx_map = .);
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#endif
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#ifdef KOBJECT_DATA_ALIGN
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. = ALIGN(KOBJECT_DATA_ALIGN);
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. += KOBJECT_DATA_SZ;
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#endif
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#endif /* LINKER_ZEPHYR_PREBUILT */
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#if defined(LINKER_ZEPHYR_FINAL)
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#include <linker-kobject-prebuilt-data.h>
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#ifdef KOBJECT_DATA_ALIGN
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. = ALIGN(KOBJECT_DATA_ALIGN);
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_kobject_data_area_start = .;
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#endif
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*(".kobject_data.data*")
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#ifdef KOBJECT_DATA_ALIGN
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_kobject_data_area_end = .;
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_kobject_data_area_used = _kobject_data_area_end - _kobject_data_area_start;
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ASSERT(_kobject_data_area_used <= KOBJECT_DATA_SZ,
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"scripts/gen_kobject_placeholders.py did not reserve enough space \
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for kobject data."
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);
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/* Padding is needed to preserve kobject addresses
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* if we have reserved more space than needed.
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*/
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. = MAX(., _kobject_data_area_start + KOBJECT_DATA_SZ);
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#endif /* KOBJECT_DATA_ALIGN */
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#endif /* LINKER_ZEPHYR_FINAL */
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} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
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#endif /* CONFIG_USERSPACE */
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