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arm: Placing the functions which holds __ramfunc into '.ramfunc'

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Using __ramfunc to places a function in RAM instead of Flash.
Code that for example reprograms flash at runtime can't execute
from flash, in that case must placing code into RAM.

This commit create a new section named '.ramfunc' in link scripts,
all functions has __ramfunc keyword saved in thats sections and
will load from flash to sram after the system booted.

Fixes: #10253

Signed-off-by: qianfan Zhao <qianfanguijin@163.com>
This commit is contained in:
qianfan Zhao 2018-09-27 14:14:17 +08:00 • committed by Andrew Boie
commit e1cc657941
6 changed files with 53 additions and 1 deletions
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10
include/linker/linker-defs.h
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@ -239,6 +239,16 @@ extern char _nocache_ram_end[];
extern char _nocache_ram_size[];
#endif /* CONFIG_NOCACHE_MEMORY */
/* Memory owned by the kernel. Start and end will be aligned for memory
* management/protection hardware for the target architecture.
*
* All the functions with '__ramfunc' keyword will be placed into this
* sections.
*/
extern char _ramfunc_ram_start[];
extern char _ramfunc_ram_end[];
extern char _ramfunc_rom_start[];
#endif /* ! _ASMLANGUAGE */
#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_ */