my__main.c

/*
MIT License

Copyright (c) 2021 Oscar Huang

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all 
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
SOFTWARE.
*/


/*
 */
#include "config.h"
#include <stdlib.h>
#include <stdint.h>
#include <string.h>


extern int appmain(void);

#define INIT_RW_REGION(regionName) 						\
{														\
	extern int Load$$##regionName##$$Base; 				\
	extern int Image$$##regionName##$$Base; 			\
	extern int Image$$##regionName##$$Length; 			\
	size_t i, len;										\
	char  *rw_ld_base, *rw_ex_base;						\
	rw_ld_base = (char*)&Load$$##regionName##$$Base;	\
	rw_ex_base = (char*)&Image$$##regionName##$$Base;	\
	len = (size_t)&Image$$##regionName##$$Length;		\
	memcpy(rw_ex_base, rw_ld_base, len);				\
}

#define INIT_ZI_REGION(regionName)						\
{ 														\
	extern int Image$$##regionName##$$ZI$$Base;			\
	extern int Image$$##regionName##$$ZI$$Length;		\
	size_t i, len;										\
	char *bss;											\
	len = (size_t)&Image$$##regionName##$$ZI$$Length;	\
	bss = (char*)&Image$$##regionName##$$ZI$$Base;		\
	memset(bss, 0, len);								\
}


#ifndef USE_ARM_LIB_STARTUP
//This function needs to be called to do scatter loading if ARM library's __main is not used:
//This function does scatter loading and then call applications main function as ARM's __main does:
void my__main()
{
	INIT_RW_REGION(RW_DATA)
	INIT_RW_REGION(configData)

	INIT_ZI_REGION(ZI_DATA);

	//Now call application's main function:
	appmain();
}
#endif