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linker: add iterable section macros

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For iterable areas defined with Z_STRUCT_SECTION_ITERABLE(),
the corresponding output section in the linker script is just
boilerplate. Add macros to make these definitions simpler.

Unfortunately, we have a fair number of iterable sections not
defined with Z_STRUCT_SECTION_ITERABLE(), this patch does not
address this.

The output sections are all named <struct name>_area, update
sanitylib.py with this.

sys_sem with no userspace, and k_lifo/k_fifo are special cases
where different data types that are all equivalent need to be
put in the same iterable area. Add
Z_STRUCT_SECTION_ITERABLE_ALTERNATE() for this special case.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-05-23 14:38:39 -07:00 • committed by Anas Nashif
commit 45979dafb4
7 changed files with 84 additions and 154 deletions
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30
include/linker/linker-defs.h
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@ -20,6 +20,7 @@
#define ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_
#include <toolchain.h>
#include <toolchain/common.h>
#include <linker/sections.h>
#include <sys/util.h>
#include <offsets.h>
@ -36,6 +37,35 @@
#endif
#ifdef _LINKER
#define Z_LINK_ITERABLE(struct_type) \
_CONCAT(_##struct_type, _list_start) = .; \
KEEP(*(SORT_BY_NAME(._##struct_type##.static.*))); \
_CONCAT(_##struct_type, _list_end) = .
/* Define an output section which will set up an iterable area
* of equally-sized data structures. For use with Z_STRUCT_SECTION_ITERABLE.
* Input sections will be sorted by name, per ld's SORT_BY_NAME.
*
* This macro should be used for read-only data.
*/
#define Z_ITERABLE_SECTION_ROM(struct_type, subalign) \
SECTION_PROLOGUE(struct_type##_area,,SUBALIGN(subalign)) \
{ \
Z_LINK_ITERABLE(struct_type); \
} GROUP_LINK_IN(ROMABLE_REGION)
/* Define an output section which will set up an iterable area
* of equally-sized data structures. For use with Z_STRUCT_SECTION_ITERABLE.
* Input sections will be sorted by name, per ld's SORT_BY_NAME.
*
* This macro should be used for read-write data that is modified at runtime.
*/
#define Z_ITERABLE_SECTION_RAM(struct_type, subalign) \
SECTION_DATA_PROLOGUE(struct_type##_area,,SUBALIGN(subalign)) \
{ \
Z_LINK_ITERABLE(struct_type); \
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
/*
* generate a symbol to mark the start of the objects array for
* the specified object and level, then link all of those objects