Provide emulated atomic load & store libcalls for u8, u16 & u32 integer
types. This is required when building with Clang as llvm does not lower
these operations to native load / stores, where as gcc does.
Provide `sync_lock_test_and_set` atomic implementations for all
supported integer types.
Closes https://github.com/espressif/esp-idf/issues/7591.
Closes https://github.com/espressif/esp-idf/issues/7592.
Since these functions receive the pointer to reent structure, they
should set errno in it rather than using thread-local errno.
This didn't cause practical issues because console functions in IDF
are only called from threads, and in that case 'r' is a pointer to
the thread-local structure, so &errno is the same thing as
&__errno_r(r). Still, fixing this for consistency.
When CONFIG_VFS_SUPPORT_IO is disabled, _read_r and _write_r
implementations in syscalls.c are used to provide console I/O via
esp_rom_uart_tx_one_char/esp_rom_uart_rx_one_char.
When newlib opens a (FILE*) stream, it calls fstat to check if the
underlying file is character-oriented. In this case, it configures the
stream to use line buffering. Otherwise (or if fstat fails) the stream
is opened as block buffered.
Since fstat wasn't provided, stdin/stdout/stderr streams got opened in
block buffered mode. For console, we need line buffered output so that
the stream buffer is flushed each time a complete line (ending with
'\n') is sent to stdout or stderr.
Fix by implementing _fstat_r stub, setting st->st_mdoe=S_IFCHR.
Before newlib 3.3.0, <dirent.h> bundled in newlib did not include any
function declarations. Instead, the file included the platform-
specific <sys/dirent.h>. This inclusion was inside a C++ guard block.
ESP-IDF provided sys/dirent.h inside newlib component, and this file
contained all the necessary function and structure declarations.
Since da418955f5,
common function declarations have been added to <dirent.h> in newlib.
However, the inclusion of sys/dirent.h has been moved out of the C++
guard block. However we didn't notice this change and did not update
sys/dirent.h in ESP-IDF newlib component to and the now-required
C++ guards there.
This commit adds the missing C++ guards to the platform-specific
sys/dirent.h.
The declarations of common dirent.h functions are now present both in
<dirent.h> (provided by newlib) and in sys/dirent.h (provided by IDF).
We keep the declarations in sys/dirent.h for compatibility, since some
ESP-IDF files and applications may include <sys/dirent.h> directly,
rather than <dirent.h>.
Closes https://github.com/espressif/esp-idf/issues/7204
Workaround libc can be moved to flash thanks to KConfig macros.
However, the following functions: `itoa`, `memcmp`, `memcpy`, `memset`, `strcat`, `strcmp`, and `strlen` are always kept it in IRAM.
Enable shared stack watchpoint for overflow detection
Enable unit tests:
* "test printf using shared buffer stack" for C3
* "Test vTaskDelayUntil" for S2
* "UART can do poll()" for C3
