188 lines
3.4 KiB
C
188 lines
3.4 KiB
C
/**
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*****************************************************************************
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**
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** File : syscalls.c
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**
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** Abstract : Atollic TrueSTUDIO Minimal System calls file
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**
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** For more information about which c-functions
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** need which of these lowlevel functions
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** please consult the Newlib libc-manual
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**
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** Environment : Atollic TrueSTUDIO
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**
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** Distribution: The file is distributed <20>as is,<2C> without any warranty
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** of any kind.
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**
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** (c)Copyright Atollic AB.
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** You may use this file as-is or modify it according to the needs of your
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** project. Distribution of this file (unmodified or modified) is not
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** permitted. Atollic AB permit registered Atollic TrueSTUDIO(R) users the
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** rights to distribute the assembled, compiled & linked contents of this
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** file as part of an application binary file, provided that it is built
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** using the Atollic TrueSTUDIO(R) Pro toolchain.
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**
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*****************************************************************************
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*/
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/* Includes */
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdio.h>
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#include <signal.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include "stm32f4xx_usart.h"
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/* Variables */
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#undef errno
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extern int errno;
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extern int __io_putchar(int ch) __attribute__((weak));
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extern int __io_getchar(void) __attribute__((weak));
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register char * stack_ptr asm("sp");
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char *__env[1] = { 0 };
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char **environ = __env;
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/* Functions */
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void initialise_monitor_handles()
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{
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}
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int _getpid(void)
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{
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return 1;
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}
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int _kill(int pid, int sig)
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{
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// errno = EINVAL;
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return -1;
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}
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void _exit (int status)
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{
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_kill(status, -1);
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while (1) {} /* Make sure we hang here */
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}
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int _read (int file, char *ptr, int len)
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{
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int DataIdx;
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for (DataIdx = 0; DataIdx < len; DataIdx++)
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{
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*ptr++ = __io_getchar();
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}
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return len;
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}
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int _write(int file, char *ptr, int len)
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{
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int i= 0;
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while(i < len) {
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while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
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USART_SendData(USART2, *ptr++);
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i++;
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}
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return len;
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}
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caddr_t _sbrk(int incr)
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{
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extern char end asm("end");
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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heap_end = &end;
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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// write(1, "Heap and stack collision\n", 25);
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// abort();
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// errno = ENOMEM;
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return (caddr_t) -1;
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}
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heap_end += incr;
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return (caddr_t) prev_heap_end;
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}
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int _close(int file)
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{
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return -1;
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}
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int _fstat(int file, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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int _isatty(int file)
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{
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return 1;
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}
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int _lseek(int file, int ptr, int dir)
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{
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return 0;
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}
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int _open(char *path, int flags, ...)
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{
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/* Pretend like we always fail */
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return -1;
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}
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int _wait(int *status)
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{
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// errno = ECHILD;
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return -1;
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}
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int _unlink(char *name)
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{
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// errno = ENOENT;
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return -1;
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}
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int _times(struct tms *buf)
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{
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return -1;
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}
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int _stat(char *file, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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int _link(char *old, char *new)
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{
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// errno = EMLINK;
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return -1;
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}
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int _fork(void)
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{
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// errno = EAGAIN;
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return -1;
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}
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int _execve(char *name, char **argv, char **env)
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{
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// errno = ENOMEM;
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return -1;
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}
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