add newlib stubs
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Makefile
1
Makefile
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@ -42,6 +42,7 @@ BIN_DIR = $(ROOT)/obj
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# Source files common to all targets
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COMMON_SRC = startup_stm32f10x_md_gcc.S \
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newlib_stubs.c \
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buzzer.c \
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cli.c \
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config.c \
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@ -0,0 +1,278 @@
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/*
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* newlib_stubs.c
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*
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* Created on: 2 Nov 2010
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* Author: nanoage.co.uk
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*/
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/times.h>
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#include <sys/unistd.h>
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#include "stm32f10x_usart.h"
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#ifndef STDOUT_USART
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#define STDOUT_USART 2
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#endif
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#ifndef STDERR_USART
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#define STDERR_USART 2
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#endif
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#ifndef STDIN_USART
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#define STDIN_USART 2
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#endif
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#undef errno
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extern int errno;
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/*
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environ
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A pointer to a list of environment variables and their values.
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For a minimal environment, this empty list is adequate:
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*/
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char *__env[1] = { 0 };
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char **environ = __env;
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int _write(int file, char *ptr, int len);
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void _exit(int status) {
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_write(1, "exit", 4);
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while (1) {
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;
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}
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}
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int _close(int file) {
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return -1;
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}
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/*
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execve
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Transfer control to a new process. Minimal implementation (for a system without processes):
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*/
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int _execve(char *name, char **argv, char **env) {
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errno = ENOMEM;
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return -1;
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}
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/*
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fork
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Create a new process. Minimal implementation (for a system without processes):
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*/
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int _fork() {
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errno = EAGAIN;
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return -1;
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}
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/*
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fstat
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Status of an open file. For consistency with other minimal implementations in these examples,
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all files are regarded as character special devices.
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The `sys/stat.h' header file required is distributed in the `include' subdirectory for this C library.
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*/
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int _fstat(int file, struct stat *st) {
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st->st_mode = S_IFCHR;
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return 0;
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}
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/*
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getpid
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Process-ID; this is sometimes used to generate strings unlikely to conflict with other processes. Minimal implementation, for a system without processes:
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*/
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int _getpid() {
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return 1;
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}
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/*
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isatty
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Query whether output stream is a terminal. For consistency with the other minimal implementations,
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*/
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int _isatty(int file) {
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switch (file){
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case STDOUT_FILENO:
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case STDERR_FILENO:
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case STDIN_FILENO:
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return 1;
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default:
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//errno = ENOTTY;
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errno = EBADF;
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return 0;
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}
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}
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/*
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kill
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Send a signal. Minimal implementation:
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*/
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int _kill(int pid, int sig) {
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errno = EINVAL;
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return (-1);
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}
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/*
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link
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Establish a new name for an existing file. Minimal implementation:
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*/
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int _link(char *old, char *new) {
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errno = EMLINK;
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return -1;
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}
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/*
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lseek
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Set position in a file. Minimal implementation:
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*/
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int _lseek(int file, int ptr, int dir) {
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return 0;
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}
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/*
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sbrk
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Increase program data space.
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Malloc and related functions depend on this
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*/
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caddr_t _sbrk(int incr) {
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extern char _ebss; // Defined by the linker
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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 = &_ebss;
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}
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prev_heap_end = heap_end;
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char * stack = (char*) __get_MSP();
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if (heap_end + incr > stack)
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{
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_write (STDERR_FILENO, "Heap and stack collision\n", 25);
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errno = ENOMEM;
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return (caddr_t) -1;
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//abort ();
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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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/*
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read
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Read a character to a file. `libc' subroutines will use this system routine for input from all files, including stdin
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Returns -1 on error or blocks until the number of characters have been read.
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*/
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int _read(int file, char *ptr, int len) {
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int n;
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int num = 0;
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switch (file) {
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case STDIN_FILENO:
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for (n = 0; n < len; n++) {
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#if STDIN_USART == 1
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while ((USART1->SR & USART_FLAG_RXNE) == (uint16_t)RESET) {}
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char c = (char)(USART1->DR & (uint16_t)0x01FF);
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#elif STDIN_USART == 2
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while ((USART2->SR & USART_FLAG_RXNE) == (uint16_t) RESET) {}
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char c = (char) (USART2->DR & (uint16_t) 0x01FF);
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#elif STDIN_USART == 3
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while ((USART3->SR & USART_FLAG_RXNE) == (uint16_t)RESET) {}
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char c = (char)(USART3->DR & (uint16_t)0x01FF);
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#endif
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*ptr++ = c;
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num++;
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}
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break;
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default:
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errno = EBADF;
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return -1;
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}
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return num;
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}
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/*
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stat
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Status of a file (by name). Minimal implementation:
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int _EXFUN(stat,( const char *__path, struct stat *__sbuf ));
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*/
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int _stat(const char *filepath, struct stat *st) {
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st->st_mode = S_IFCHR;
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return 0;
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}
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/*
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times
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Timing information for current process. Minimal implementation:
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*/
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clock_t _times(struct tms *buf) {
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return -1;
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}
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/*
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unlink
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Remove a file's directory entry. Minimal implementation:
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*/
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int _unlink(char *name) {
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errno = ENOENT;
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return -1;
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}
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/*
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wait
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Wait for a child process. Minimal implementation:
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*/
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int _wait(int *status) {
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errno = ECHILD;
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return -1;
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}
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/*
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write
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Write a character to a file. `libc' subroutines will use this system routine for output to all files, including stdout
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Returns -1 on error or number of bytes sent
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*/
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int _write(int file, char *ptr, int len) {
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int n;
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switch (file) {
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case STDOUT_FILENO: /*stdout*/
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for (n = 0; n < len; n++) {
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#if STDOUT_USART == 1
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while ((USART1->SR & USART_FLAG_TC) == (uint16_t)RESET) {}
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USART1->DR = (*ptr++ & (uint16_t)0x01FF);
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#elif STDOUT_USART == 2
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while ((USART2->SR & USART_FLAG_TC) == (uint16_t) RESET) {
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}
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USART2->DR = (*ptr++ & (uint16_t) 0x01FF);
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#elif STDOUT_USART == 3
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while ((USART3->SR & USART_FLAG_TC) == (uint16_t)RESET) {}
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USART3->DR = (*ptr++ & (uint16_t)0x01FF);
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#endif
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}
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break;
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case STDERR_FILENO: /* stderr */
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for (n = 0; n < len; n++) {
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#if STDERR_USART == 1
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while ((USART1->SR & USART_FLAG_TC) == (uint16_t)RESET) {}
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USART1->DR = (*ptr++ & (uint16_t)0x01FF);
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#elif STDERR_USART == 2
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while ((USART2->SR & USART_FLAG_TC) == (uint16_t) RESET) {
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}
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USART2->DR = (*ptr++ & (uint16_t) 0x01FF);
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#elif STDERR_USART == 3
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while ((USART3->SR & USART_FLAG_TC) == (uint16_t)RESET) {}
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USART3->DR = (*ptr++ & (uint16_t)0x01FF);
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#endif
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}
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break;
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default:
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errno = EBADF;
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return -1;
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}
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return len;
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}
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