/*
 * Copyright © Matthew Wozniak <me@woz.blue>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * This startup.c file is for the STM32F103C8T6 used on the bluepill boards, and
 * while it may work for others I provide no guarntees.
 */

#include "intdefs.h"

#define SRAM_START (0x20000000U)
#define SRAM_SIZE (20U * 1024U)
#define SRAM_END (SRAM_START + SRAM_SIZE)
#define STACK_POINTER_INIT_ADDRESS (SRAM_END)

#include <string.h>

#define ISR_VECTOR_SIZE 76

void reset_handler();
void default_handler();
void nmi_handler() __attribute__((weak, alias("default_handler")));
void hardfault_handler() __attribute__((weak, alias("default_handler")));
void memory_management_handler() __attribute__((weak, alias("default_handler")));
void bus_fault_handler() __attribute__((weak, alias("default_handler")));
void usage_fault_handler() __attribute__((weak, alias("default_handler")));
void svcall_handler() __attribute__((weak, alias("default_handler")));
void debug_monitor_handler() __attribute__((weak, alias("default_handler")));
void pendsv_handler() __attribute__((weak, alias("default_handler")));
void systick_handler() __attribute__((weak, alias("default_handler")));
void wwdg_handler() __attribute__((weak, alias("default_handler")));
void pvd_handler() __attribute__((weak, alias("default_handler")));
void tamper_handler() __attribute__((weak, alias("default_handler")));
void rtc_handler() __attribute__((weak, alias("default_handler")));
void flash_handler() __attribute__((weak, alias("default_handler")));
void rcc_handler() __attribute__((weak, alias("default_handler")));
void exti0_handler() __attribute__((weak, alias("default_handler")));
void exti1_handler() __attribute__((weak, alias("default_handler")));
void exti2_handler() __attribute__((weak, alias("default_handler")));
void exti3_handler() __attribute__((weak, alias("default_handler")));
void exti4_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel1_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel2_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel3_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel4_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel5_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel6_handler() __attribute__((weak, alias("default_handler")));
void dma1_channel7_handler() __attribute__((weak, alias("default_handler")));
void adc_handler() __attribute__((weak, alias("default_handler")));
void usbhp_cantx_handler() __attribute__((weak, alias("default_handler")));
void usblp_canrx0_handler() __attribute__((weak, alias("default_handler")));
void canrx1_handler() __attribute__((weak, alias("default_handler")));
void cansce_handler() __attribute__((weak, alias("default_handler")));
void exti9_5_handler() __attribute__((weak, alias("default_handler")));
void tim1brk_handler() __attribute__((weak, alias("default_handler")));
void tim1up_handler() __attribute__((weak, alias("default_handler")));
void tim1trgcom_handler() __attribute__((weak, alias("default_handler")));
void tim1cc_handler() __attribute__((weak, alias("default_handler")));
void tim2_handler() __attribute__((weak, alias("default_handler")));
void tim3_handler() __attribute__((weak, alias("default_handler")));
void tim4_handler() __attribute__((weak, alias("default_handler")));
void i2c1_ev_handler() __attribute__((weak, alias("default_handler")));
void i2c1_er_handler() __attribute__((weak, alias("default_handler")));
void i2c2_ev_handler() __attribute__((weak, alias("default_handler")));
void i2c2_er_handler() __attribute__((weak, alias("default_handler")));
void spi1_handler() __attribute__((weak, alias("default_handler")));
void spi2_handler() __attribute__((weak, alias("default_handler")));
void usart1_handler() __attribute__((weak, alias("default_handler")));
void usart2_handler() __attribute__((weak, alias("default_handler")));
void usart3_handler() __attribute__((weak, alias("default_handler")));
void exti15_10_handler() __attribute__((weak, alias("default_handler")));
void rtcalarm_handler() __attribute__((weak, alias("default_handler")));
void usbwakeup_handler() __attribute__((weak, alias("default_handler")));
void tim8brk_handler() __attribute__((weak, alias("default_handler")));
void tim8up_handler() __attribute__((weak, alias("default_handler")));
void tim8trgcom_handler() __attribute__((weak, alias("default_handler")));
void tim8cc_handler() __attribute__((weak, alias("default_handler")));
void adc3_handler() __attribute__((weak, alias("default_handler")));
void fsmc_handler() __attribute__((weak, alias("default_handler")));
void sdio_handler() __attribute__((weak, alias("default_handler")));
void tim5_handler() __attribute__((weak, alias("default_handler")));
void spi3_handler() __attribute__((weak, alias("default_handler")));
void uart4_handler() __attribute__((weak, alias("default_handler")));
void uart5_handler() __attribute__((weak, alias("default_handler")));
void tim6_handler() __attribute__((weak, alias("default_handler")));
void tim7_handler() __attribute__((weak, alias("default_handler")));
void dma2_channel1_handler() __attribute__((weak, alias("default_handler")));
void dma2_channel2_handler() __attribute__((weak, alias("default_handler")));
void dma2_channel3_handler() __attribute__((weak, alias("default_handler")));
void dma2_channel4_5_handler() __attribute__((weak, alias("default_handler")));

void (*isr_vector[ISR_VECTOR_SIZE])() __attribute__((section(".isr_vector"))) = {
	(void (*)())STACK_POINTER_INIT_ADDRESS,
	reset_handler,
	nmi_handler,
	hardfault_handler,
	memory_management_handler,
	bus_fault_handler,
	usage_fault_handler,
	nullptr, /* reserved */
	svcall_handler,
	debug_monitor_handler,
	nullptr, /* reserved */
	nullptr,
	nullptr,
	nullptr,
	pendsv_handler,
	systick_handler,
	wwdg_handler,
	pvd_handler,
	tamper_handler,
	rtc_handler,
	flash_handler,
	rcc_handler,
	exti0_handler,
	exti1_handler,
	exti2_handler,
	exti3_handler,
	exti4_handler,
	dma1_channel1_handler,
	dma1_channel2_handler,
	dma1_channel3_handler,
	dma1_channel4_handler,
	dma1_channel5_handler,
	dma1_channel6_handler,
	dma1_channel7_handler,
	adc_handler,
	usbhp_cantx_handler,
	usblp_canrx0_handler,
	canrx1_handler,
	cansce_handler,
	exti9_5_handler,
	tim1brk_handler,
	tim1up_handler,
	tim1trgcom_handler,
	tim1cc_handler,
	tim2_handler,
	tim3_handler,
	tim4_handler,
	i2c1_ev_handler,
	i2c1_er_handler,
	i2c2_ev_handler,
	i2c2_er_handler,
	spi1_handler,
	spi2_handler,
	usart1_handler,
	usart2_handler,
	usart3_handler,
	exti15_10_handler,
	rtcalarm_handler,
	usbwakeup_handler,
	tim8brk_handler,
	tim8up_handler,
	tim8trgcom_handler,
	tim8cc_handler,
	adc3_handler,
	fsmc_handler,
	sdio_handler,
	tim5_handler,
	spi3_handler,
	uart4_handler,
	uart5_handler,
	tim6_handler,
	tim7_handler,
	dma2_channel1_handler,
	dma2_channel2_handler,
	dma2_channel3_handler,
	dma2_channel4_5_handler,
};

void default_handler() {
	while (1) {}
}

extern u32 _etext, _sdata, _sidata, _edata, _sbss, _ebss;
int main();

void reset_handler() {
	// copy .data from FLASH to SRAM
	u32 data_sz = (u32)&_edata - (u32)&_sdata;
	memcpy(&_sdata, &_sidata, data_sz);

	// zero-fill .bss
	memset(&_sbss, 0, (u32)&_ebss - (u32)&_sbss);

	// run our program
	main();
}

// vi: sw=4 ts=4 noet tw=80 cc=80