syscalls.h

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#include "stm32f4xx.h"
#include <reent.h>
#include <stdbool.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <hal_types.h>

#ifdef __cplusplus
 extern "C" {
#endif

int _kill(int pid, int sig);

void _exit(int status);
int _getpid(void);

static inline caddr_t get_stack_top(void)
{
//     return (char*) __get_MSP(); -- let use current stack
    uint32_t sp;
    asm volatile ("mov %0, sp\n\t"  : "=rm" (sp) );
    return (caddr_t)sp;
}

caddr_t _sbrk(int nbytes);
caddr_t sbrk_ccm(int nbytes);

int _open(const char *path, int flags, ...);
int _close(int fd);
int _fstat(int fd, struct stat *st);
int _isatty(int fd);
int isatty(int fd);
int _lseek(int fd, off_t pos, int whence);
unsigned char getch(void);
int _read(int fd, char *buf, size_t cnt);
void putch(unsigned char c);

void cgets(char *s, int bufsize);
int _write(int fd, const char *buf, size_t cnt);
//char *fgets(char *s, int bufsize, void *f);
void clock_gettime(uint32_t a1, void *a2);


#pragma pack(push, 1)
union udid {
        uint32_t serial[3];
        uint8_t  data[12];
};
#pragma pack(pop)

void get_board_serial(uint8_t *serialid);
int val_read(void *dest, volatile const void *src, int bytes);

#ifdef __cplusplus
 }
#endif