esp-idf/components/esp32/syscalls.c

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2016-08-17 11:08:22 -04:00
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <sys/reent.h>
#include <stdlib.h>
#include "rom/libc_stubs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/portmacro.h"
#include "freertos/task.h"
int uart_tx_one_char(uint8_t c);
void abort() {
do
{
__asm__ ("break 0,0");
*((int*) 0) = 0;
} while(true);
}
void* _malloc_r(struct _reent *r, size_t size) {
return pvPortMalloc(size);
}
void _free_r(struct _reent *r, void* ptr) {
return vPortFree(ptr);
}
// TODO: improve realloc to grow buffer in place if possible
void* _realloc_r(struct _reent *r, void* ptr, size_t size) {
void* new_chunk = pvPortMalloc(size);
if (new_chunk) {
memcpy(new_chunk, ptr, size);
vPortFree(ptr);
}
// realloc behaviour: don't free original chunk if alloc failed
return new_chunk;
}
void* _calloc_r(struct _reent *r, size_t count, size_t size) {
void* result = pvPortMalloc(count * size);
if (result)
{
memset(result, 0, count * size);
}
return result;
}
int _system_r(struct _reent *r, const char *str) {
abort();
return 0;
}
int _rename_r(struct _reent *r, const char *src, const char *dst) {
abort();
return 0;
}
clock_t _times_r(struct _reent *r, struct tms *ptms) {
abort();
return 0;
}
// TODO: read time from RTC
int _gettimeofday_r(struct _reent *r, struct timeval *tv, void *tz) {
abort();
return 0;
}
void _raise_r(struct _reent *r) {
abort();
}
int _unlink_r(struct _reent *r, const char *path) {
abort();
return 0;
}
int _link_r(struct _reent *r, const char* n1, const char* n2) {
abort();
return 0;
}
int _stat_r(struct _reent *r, const char * path, struct stat * st) {
return 0;
}
int _fstat_r(struct _reent *r, int fd, struct stat * st) {
st->st_mode = S_IFCHR;
return 0;
}
void* _sbrk_r(struct _reent *r, ptrdiff_t sz) {
abort();
return 0;
}
int _getpid_r(struct _reent *r) {
abort();
return 0;
}
int _kill_r(struct _reent *r, int pid, int sig) {
abort();
return 0;
}
void _exit_r(struct _reent *r, int e) {
abort();
}
int _close_r(struct _reent *r, int fd) {
return 0;
}
int _open_r(struct _reent *r, const char * path, int flags, int mode) {
return 0;
}
ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size) {
const char* p = (const char*) data;
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if (fd == STDOUT_FILENO) {
while(size--) {
#if CONFIG_NEWLIB_STDOUT_ADDCR
if (*p=='\n') {
uart_tx_one_char('\r');
}
#endif
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uart_tx_one_char(*p);
++p;
}
}
return size;
}
_off_t _lseek_r(struct _reent *r, int fd, _off_t size, int mode) {
return 0;
}
// TODO: implement reading from UART
ssize_t _read_r(struct _reent *r, int fd, void * dst, size_t size) {
return 0;
}
// TODO: implement locks via FreeRTOS mutexes
void _lock_init(_lock_t *lock) {
}
void _lock_init_recursive(_lock_t *lock) {
}
void _lock_close(_lock_t *lock) {
}
void _lock_close_recursive(_lock_t *lock) {
}
void _lock_acquire(_lock_t *lock) {
}
void _lock_acquire_recursive(_lock_t *lock) {
}
int _lock_try_acquire(_lock_t *lock) {
return 0;
}
int _lock_try_acquire_recursive(_lock_t *lock) {
return 0;
}
void _lock_release(_lock_t *lock) {
}
void _lock_release_recursive(_lock_t *lock) {
}
static struct _reent s_reent;
/*
General ToDo that the Xtensa newlib support code did but we do not: Close every open fd a running task had when the task
is killed. Do we want that too? - JD
*/
extern int _printf_float(struct _reent *rptr,
void *pdata,
FILE * fp,
int (*pfunc) (struct _reent *, FILE *, _CONST char *, size_t len),
va_list * ap);
extern int _scanf_float(struct _reent *rptr,
void *pdata,
FILE *fp,
va_list *ap);
static struct syscall_stub_table s_stub_table = {
.__getreent = &__getreent,
._malloc_r = &_malloc_r,
._free_r = &_free_r,
._realloc_r = &_realloc_r,
._calloc_r = &_calloc_r,
._abort = &abort,
._system_r = &_system_r,
._rename_r = &_rename_r,
._times_r = &_times_r,
._gettimeofday_r = &_gettimeofday_r,
._raise_r = &_raise_r,
._unlink_r = &_unlink_r,
._link_r = &_link_r,
._stat_r = &_stat_r,
._fstat_r = &_fstat_r,
._sbrk_r = &_sbrk_r,
._getpid_r = &_getpid_r,
._kill_r = &_kill_r,
._exit_r = &_exit_r,
._close_r = &_close_r,
._open_r = &_open_r,
._write_r = (int (*)(struct _reent *r, int, const void *, int)) &_write_r,
._lseek_r = (int (*)(struct _reent *r, int, int, int)) &_lseek_r,
._read_r = (int (*)(struct _reent *r, int, void *, int)) &_read_r,
._lock_init = &_lock_init,
._lock_init_recursive = &_lock_init_recursive,
._lock_close = &_lock_close,
._lock_close_recursive = &_lock_close_recursive,
._lock_acquire = &_lock_acquire,
._lock_acquire_recursive = &_lock_acquire_recursive,
._lock_try_acquire = &_lock_try_acquire,
._lock_try_acquire_recursive = &_lock_try_acquire_recursive,
._lock_release = &_lock_release,
._lock_release_recursive = &_lock_release_recursive,
._printf_float = &_printf_float,
._scanf_float = &_scanf_float,
};
void ets_setup_syscalls() {
syscall_table_ptr_pro = &s_stub_table;
syscall_table_ptr_app = &s_stub_table;
_GLOBAL_REENT = &s_reent;
environ = malloc(sizeof(char*));
environ[0] = NULL;
}