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/*
* Arm SCP/MCP Software
* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdbool.h>
#include <fwk_arch.h>
#include <fwk_assert.h>
#include <fwk_errno.h>
#include <fwk_macros.h>
#include <cmsis_compiler.h>
#define SCB_CCR ((FWK_RW uint32_t *)(0xE000ED14))
#define SCB_CCR_UNALIGN_TRP_MASK (1U << 3)
#define SCB_CCR_DIV_0_TRP_MASK (1U << 4)
#define SCB_CCR_STKALIGN_MASK (1U << 9)
extern int arm_nvic_init(struct fwk_arch_interrupt_driver **driver);
extern int arm_mm_init(struct fwk_arch_mm_data *data);
#if defined(__ARMCC_VERSION)
/*
* Standard library backend functions required by Arm Compiler 6.
*/
/* Platform-dependent backend for the assert() macro */
void __aeabi_assert(const char *expr, const char *file, int line)
{
fwk_trap();
}
#elif defined(__NEWLIB__)
/*
* Standard library backend functions required by newlib[-nano].
*/
/* Platform-dependent backend for the assert() macro */
void __assert_func(
const char *file,
int line,
const char *function,
const char *assertion)
{
fwk_trap();
}
/* Platform-dependent backend for the _Exit() function */
void _exit(int status)
{
while (true)
__WFI();
}
#endif
static struct fwk_arch_init_driver arch_init_driver = {
.mm = arm_mm_init,
.interrupt = arm_nvic_init,
};
static void arm_init_ccr(void)
{
/*
* Set up the Configuration Control Register (CCR) in the System Control
* Block (1) by setting the following flag bits:
*
* UNALIGN_TRP [3]: Enable trapping on unaligned word or halfword accesses.
* DIV_0_TRP [4]: Enable trapping on division by zero.
* STKALIGN [9]: Enable automatic DWORD stack-alignment on exception
* entry (2).
*
* All other bits are left in their default state.
*
* (1) ARM® v7-M Architecture Reference Manual, section B3.2.8.
* (2) ARM® v7-M Architecture Reference Manual, section B1.5.7.
*/
*SCB_CCR |= SCB_CCR_UNALIGN_TRP_MASK;
*SCB_CCR |= SCB_CCR_DIV_0_TRP_MASK;
*SCB_CCR |= SCB_CCR_STKALIGN_MASK;
}
int main(void)
{
arm_init_ccr();
return fwk_arch_init(&arch_init_driver);
}
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