The integrity_walker now calls the integrity check hook to control
free AND used blocks of memory in the TLSF pool. This integrity walker
function is called from tlsf_check_pool.
This commit creates a patch of integrity_walker function to update the
outdated implementation in the ROM.
The tlsf implementation in the ROM does not provide a mechanism
to register a callback to be called in by tlsf_check().
This commit is creating a patch of the tlsf implementation to provide
a definition of the function allowing to register the callback called
in tlsf_check() and add the call of this callback in tlsf_check().
This patch is only compiled for target(s) with ESP_ROM_HAS_HEAP_TLSF
set and ESP_ROM_TLSF_CHECK_PATCH set. For all the other configurations
the environment remains unchanged by those modifications.
This fixes passing -Wimplicit-fallthrough=0 flag to Clang, which it
doesn't recognize, and is not necessary for this file.
Also the flag is changed from PUBLIC to PRIVATE since it is necessary
when compiling this component only.
To make the transition from 32-bit time_t to 64-bit time_t smoother,
detect the size of this type in CMake and remove the manual option in
Kconfig.
The information about 64-bit time_t support is moved from Kconfig help
string into the "system time" section of the API reference.
...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
