154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/* newlib_syscalls.c - newlib syscalls for ESP8266
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*
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* Part of esp-open-rtos
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* Copyright (C) 2105 Superhouse Automation Pty Ltd
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* BSD Licensed as described in the file LICENSE
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*/
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#include <sys/reent.h>
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <espressif/sdk_private.h>
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#include <common_macros.h>
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#include <xtensa_ops.h>
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#include <esp/uart.h>
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#include <stdlib.h>
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#include <stdout_redirect.h>
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#include <sys/time.h>
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extern void *xPortSupervisorStackPointer;
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IRAM caddr_t _sbrk_r (struct _reent *r, int incr)
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{
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extern char _heap_start; /* linker script defined */
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static char * heap_end;
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char * prev_heap_end;
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if (heap_end == NULL)
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heap_end = &_heap_start;
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prev_heap_end = heap_end;
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intptr_t sp = (intptr_t)xPortSupervisorStackPointer;
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if(sp == 0) /* scheduler not started */
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SP(sp);
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if ((intptr_t)heap_end + incr >= sp)
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{
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r->_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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/* syscall implementation for stdio write to UART */
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__attribute__((weak)) long _write_stdout_r(struct _reent *r, int fd, const char *ptr, int len )
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{
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for(int i = 0; i < len; i++) {
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/* Auto convert CR to CRLF, ignore other LFs (compatible with Espressif SDK behaviour) */
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if(ptr[i] == '\r')
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continue;
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if(ptr[i] == '\n')
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uart_putc(0, '\r');
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uart_putc(0, ptr[i]);
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}
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return len;
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}
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static _WriteFunction *current_stdout_write_r = &_write_stdout_r;
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void set_write_stdout(_WriteFunction *f)
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{
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if (f != NULL) {
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current_stdout_write_r = f;
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} else {
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current_stdout_write_r = &_write_stdout_r;
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}
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}
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_WriteFunction *get_write_stdout()
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{
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return current_stdout_write_r;
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}
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/* default implementation, replace in a filesystem */
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__attribute__((weak)) long _write_filesystem_r(struct _reent *r, int fd, const char *ptr, int len )
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{
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r->_errno = EBADF;
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return -1;
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}
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__attribute__((weak)) long _write_r(struct _reent *r, int fd, const char *ptr, int len )
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{
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if(fd != r->_stdout->_file) {
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return _write_filesystem_r(r, fd, ptr, len);
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}
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return current_stdout_write_r(r, fd, ptr, len);
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}
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/* syscall implementation for stdio read from UART */
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__attribute__((weak)) long _read_stdin_r(struct _reent *r, int fd, char *ptr, int len)
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{
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int ch, i;
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uart_rxfifo_wait(0, 1);
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for(i = 0; i < len; i++) {
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ch = uart_getc_nowait(0);
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if (ch < 0) break;
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ptr[i] = ch;
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}
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return i;
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}
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/* default implementation, replace in a filesystem */
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__attribute__((weak)) long _read_filesystem_r( struct _reent *r, int fd, char *ptr, int len )
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{
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r->_errno = EBADF;
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return -1;
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}
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__attribute__((weak)) long _read_r( struct _reent *r, int fd, char *ptr, int len )
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{
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if(fd != r->_stdin->_file) {
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return _read_filesystem_r(r, fd, ptr, len);
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}
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return _read_stdin_r(r, fd, ptr, len);
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}
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/* Stub syscall implementations follow, to allow compiling newlib functions that
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pull these in via various codepaths
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*/
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__attribute__((weak, alias("syscall_returns_enosys")))
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int _open_r(struct _reent *r, const char *pathname, int flags, int mode);
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__attribute__((weak, alias("syscall_returns_enosys")))
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int _close_r(struct _reent *r, int fd);
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__attribute__((weak, alias("syscall_returns_enosys")))
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int _unlink_r(struct _reent *r, const char *path);
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__attribute__((weak, alias("syscall_returns_enosys")))
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int _fstat_r(struct _reent *r, int fd, void *buf);
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__attribute__((weak, alias("syscall_returns_enosys")))
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int _stat_r(struct _reent *r, const char *pathname, void *buf);
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__attribute__((weak, alias("syscall_returns_enosys")))
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off_t _lseek_r(struct _reent *r, int fd, off_t offset, int whence);
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__attribute__((weak, alias("_gettimeofday_r")))
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int _gettimeofday_r _PARAMS ((struct _reent *r, struct timeval *now, void *p)) {
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now->tv_sec = 0;
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now->tv_usec = 0;
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errno = ENOSYS;
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return -1;
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}
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/* Generic stub for any newlib syscall that fails with errno ENOSYS
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("Function not implemented") and a return value equivalent to
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(int)-1. */
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static int syscall_returns_enosys(struct _reent *r)
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{
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r->_errno=ENOSYS;
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return -1;
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}
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