Some APs are configured to hide the SSID, the length field of the SSID element
in the Beacon frame is set to 0. This can cause incorrect parsing of the Beacon
by the Wi-Fi MAC hardware.
Some APs send two beacon frames with different BSSID in a TBTT cycle. After
correctly parsing the beacon of the associated AP, it continue to receive the
other beacon frame, which will cause the MAC to remain in a wait RX/TXING
state, blocking the Wi-Fi go to sleep.
Used esp-rom tag esp32s3-20210327 and did manual cleanup.
Rename s_usb_osglue to rom_usb_osglue like it was done for esp32s2.
Some comments in esp32s2 headers are synced from esp32s3.
- Move {target}/rom/miniz.h to common miniz.h
- Add ESP_ROM_HAS_MZ_CRC32 for ESP32/S2/S3/C3/H2
- Alias mz_crc32 to crc32_le if chips not support ESP_ROM_HAS_MZ_CRC32
sizeof(time_t) was previously switched from 4 to 8, ROM functions that use
time_t or dependent types (such as "struct stat") are no longer called due as
they still treat sizeof(time_t) as 4 (see commit
24c20d18).
However, there is a ROM callpath that was left out. If putchar is the first
stdio print related call, the call path will result in cantwrite() ->
__swsetup_r() -> __smakebuf_r() -> __swhatbuf_r() using the ROM "struct stat"
(where sizeof(time_t)==4).
Instead of removing all printf related ROM newlib functions (which will result
in increased binary size), this commit adds a workaround to setup the stdio
files before any print related calls occur.
This results in cantwrite() always returning false, thus the callpath described
above never being reached.
Closes https://github.com/espressif/esp-idf/issues/9269
...and all their callers.
With the upcoming switch from sizeof(time_t)==4 to sizeof(time_t)==8,
sizeof(struct stat) is also increasing.
A few newlib functions present in ROM allocate 'struct stat' on the
stack and call _fstat_r on this structure. The implementation of
fstat is provided in ESP-IDF. This implementation will often do
memset(st, 0, sizeof(*st)), where st is 'struct stat*', before setting
some fields of this structure. If IDF is built with sizeof(st)
different from sizeof(st) which ROM was built with, this will lead
to an out-of-bounds write and a stack corruption.
This commit removes problematic ROM functions from the linker script.
Here are the functions which allocate 'struct stat':
* _isatty_r (in ROM)
* __swhatbuf_r, called by __smakebuf_r, called by __swsetup_r and
__srefill_r (in ROM)
* _fseeko_r (not in ROM)
* glob2 (not in ROM)
* _gettemp (not in ROM)
As a result, these functions are used from libc.a, and use correct
size of 'stat' structure.
Closes https://github.com/espressif/esp-idf/issues/7980
