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// SPDX-License-Identifier: BSD-3-Clause
/******************************************************************************
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
*
******************************************************************************/
#include <stdint.h>
/******************************************************************************
*
* The entry point for the application startup code.
*
******************************************************************************/
extern int main(void);
/******************************************************************************
*
* Reserve space for the system stack.
*
******************************************************************************/
__attribute__ ((section(".stack")))
static uint32_t stack[100];
const uint32_t stack_pntr = (uint32_t)stack + sizeof(stack);
/******************************************************************************
*
* The following are constructs created by the linker indicating where
* the "bss" and "ebss" segments reside in memory.
*
******************************************************************************/
extern uint32_t _bss;
extern uint32_t _ebss;
/******************************************************************************
*
* This is the entry point that handles setting the stack within the allowed
* workspace, initializing the .bss segment, and then jumping to main.
*
******************************************************************************/
__attribute__ ((section(".entry")))
void entry(void)
{
/* Workaround for ITT instructions. */
__asm(" NOP");
__asm(" NOP");
__asm(" NOP");
__asm(" NOP");
/* Initialize stack pointer */
__asm(" ldr sp, =stack_pntr");
/* Zero fill the bss segment. */
__asm(" ldr r0, =_bss\n"
" ldr r1, =_ebss\n"
" mov r2, #0\n"
" .thumb_func\n"
" zero_loop:\n"
" cmp r0, r1\n"
" it lt\n"
" strlt r2, [r0], #4\n"
" blt zero_loop");
/* Call the application's entry point. */
main();
/* If we ever return, enter an infinite loop */
while (1)
;
}
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