b0844b01bc
Also reduces the IRAM footprint of the fatal exception handler, as only the prelude (which disables interrupts & enables the flash mapping) is in IRAM now. Closes #54, relevant to #133.
87 lines
2.5 KiB
C
87 lines
2.5 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 <esp/uart.h>
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#include <stdlib.h>
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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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/* TODO: Check stack collision
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if (heap_end + incr > stack_ptr)
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{
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_write (1, "_sbrk: Heap collided with stack\n", 32);
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abort();
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}
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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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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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r->_errno = EBADF;
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return -1;
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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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/* syscall implementation for stdio read from UART */
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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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int ch, i;
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if(fd != r->_stdin->_file) {
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r->_errno = EBADF;
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return -1;
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}
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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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/* 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__((alias("syscall_returns_enosys"))) int _open_r(struct _reent *r, const char *pathname, int flags, int mode);
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__attribute__((alias("syscall_returns_enosys"))) int _fstat_r(struct _reent *r, int fd, void *buf);
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__attribute__((alias("syscall_returns_enosys"))) int _close_r(struct _reent *r, int fd);
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__attribute__((alias("syscall_returns_enosys"))) off_t _lseek_r(struct _reent *r, int fd, off_t offset, int whence);
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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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