* optionally move float emulation code into iram
allows doing float operation in iram
suitable for libraries like AccelStepper when called from ISR
* proposed changes for pio from @mcspr
Remove nonos-sdk-v2.2.0-28-g89920dc aka 3v0, since we have a real v3
Remove 3.0.0...3.0.4 to reduce overhead in maintaining a bunch or binary patches
Update our docs and menu opts to mention 'experimental' status
Old versions still remains in git history, so anyone wanting to play around with 3.0.x could still make use of that work
## WPA2 Enterprise connections
References - merged PRs:
* https://github.com/esp8266/Arduino/pull/8529
* https://github.com/esp8266/Arduino/pull/8566 - these occurred with connect/disconnect with WPA-Enterprise
* https://github.com/esp8266/Arduino/pull/8736#issue-1470774550
The NON-OS SDK 3.0.x has breaking changes to the [`pvPortMalloc`](bf890b22e5/include/mem.h (L42)) function. They added a new `bool` argument for selecting a heap.
```cpp
void *pvPortMalloc (size_t sz, const char *, unsigned, bool);
```
To avoid breaking the build, I added a new thin wrapper function `sdk3_pvPortMalloc` to `heap.cpp`.
Edited new SDK LIBs to call `pvPortMalloc`'s replacement `sdk3_pvPortMalloc`.
They also added `pvPortZallocIram` and `pvPortCallocIram`, which are not a problem to support. Support added to `heap.cpp`.
Issues with WPA2 Enterprise in new SDKs:
* v3.0.0 and v3.0.1 - have the same memory leak and duplicate free bugs from before
* v3.0.2 through v3.0.5 - have the same memory leak; however, _no_ duplicate free crash.
* memory leak can be seen by cycling through setup, connect, disconnect, and clear setup - repeatedly.
Updated `wpa2_eap_patch.cpp` and binary patch scripts to handle v3.0.0 through v3.0.5.
Patched SDKs v3.0.0 through v3.0.5
## Duplicate Non-32-bit exception handler
Issue: At v3.0.0 and above `libmain.a` supplies a built-in exception handler (`load_non_32_wide_handler`) for non-32-bit access. Our non-32-bit access handler (`non32xfer_exception_handler`) overrides it.
Solution: Add "weak" attribute to symbol `load_non_32_wide_handler`. Adjust the build to default to the SDK's built-in non-32-bit handler. If there is a need to use our non-32-bit handler, make the selection from the Arduino IDE Tools menu `Non-32-Bit Access: "Byte/Word access to IRAM/PROGMEM (very slow)"`.
With SDKs v3.0.0 and above a "non-32-bit exception handler" is always present.
* works
* fixup! works
* back to callbacks
* names
* daisy chain
* seconds
* less inline
* fix dns setter
* might as well keep using initlist
/to d-a-v it has automatic storage, here it's the same stack based one
(just one less line for us)
* shift blame
* naming
* fix impl
* revert to ip4 dns
* merge fix
* restyle
* masking done wrong
* Patch eap.o memory leak
WiFi Enterprise option can leak up to 3 allocations per connect/disconnect
cycle: anonymous Identity, password, and some unidentified allocation.
This solution patches eap.o from libwpa2 to call a special 2 part
wrapper instead of vPortFree for cleanup.
Corrected typos and adjusted tabs in script.
Added script eval_fix_sdks.sh to aid in evaluating similarity between
patch sections of .o files being patched across different SDKs.
* Add some dev debug code and improve comments
* Patch eap.o memory leak
WiFi Enterprise option can leak up to 3 allocations per connect/disconnect
cycle: anonymous Identity, password, and some unidentified allocation.
This solution patches eap.o from libwpa2 to call a special 2 part
wrapper instead of vPortFree for cleanup.
Corrected typos and adjusted tabs in script.
Added script eval_fix_sdks.sh to aid in evaluating similarity between
patch sections of .o files being patched across different SDKs.
* Add some dev debug code and improve comments
* Fix double-free when connecting to WPA2-Enterprise networks
Fixes: #8082
This patches the callx0 instruction to a nop in eap.o which is part of libwpa2.a.
It looks like espressif fixed the Bug in newer SDK versions, so if we update to the latest NONOS-SDK it is most likely not necessary to add/adapt this patch.
Also modifies the fix_sdk_libs.sh script as it even changed files if no changes were necessary, for example adding multiple system_func1 exports.
* Apply suggestions from code review
* Initialize SoftAP DhcpServer object on demand
Remove dependency on global ctor, and just construct the object when
someone asks us to do it. Only dependency right now is netif_git, which
is expected to be initialized by the lwip code some time before
dhcps_start happens.
Removing ip_info from begin(), since we never reference later on.
Also removing the specific check for netif id and simplify the ctors.
Update tests and recover old nonos-sdk dhcps functions that were not implemented.
* nonos helpers have a separate header
* wifi ap needs this anyway, simplify sketch includes
* missing example
* existing name :/
* trying to fix header dependency
* restyle
* not a c header
* no need to init
* move dhcp server getter to WiFi
more... arduino'ish? we ahve object as namespace, plus everything else
related to softAP is there
redundant includes, redundant mock impl (out-of-scope here to fix)
* ...move things back, still expose as WiFi method
* review fix
* include -nonos header in wifi lib though
* no more lwip include
* style
* need mock dhcpserver instance
* Define lwIP's s32/u32 to int
s32/u32 were previously defined as long,
but long can be 64 bits in host mode,
so this commit reduces valgrind complaints and increase coherency.
* some lads like to use `unsigned long` for 32 bits IPv4 addresses
* fix lwIP's `sys_now()` return type
* fix C declarations
* merge upstream (lwip2) update on sys_now() definition
* matching lwIP api (2/2)
Co-authored-by: Max Prokhorov <prokhorov.max@outlook.com>
* Fix PRxxx printf format macros
Update toolchain (newlib) to supply proper definitions for PRxxx macros.
Fixes#8220
Added a PRxxx macro to an example to ensure CI will catch any problem like
this in the future.
Fixes#8069
GCC 10.3 has a patch to stop escaping the initial : in Windows paths which
is causing Arduino and other tools to fail dependency checks and rebuild
everything on every compile.
without any external wiring.
This patch introduces the new method
Esp.rebootIntoUartDownloadMode()
When the user calls this method the ESP8266 reboots into the UART
download mode. In this mode the user can use esptool.py to flash a new
firmware file. The following command was used to test it:
$ esptool.py --before no_reset --after soft_reset --chip esp8266 \
--port /dev/ttyUSB0 --baud 460800 write_flash 0x0 firmware.bin
The implementation is based on the original implementation in the
boot ROM. Some parts of the original implementation can be found in
[1]. This patch is a squashed and simplified version of [2]. The non
squashed version might be helpful in case of debugging issues.
[1] https://github.com/twischer/xtensa-subjects/blob/master/reversed/bootrom.c
[2] https://github.com/twischer/Arduino/tree/reboot_uart_download_full
Signed-off-by: Timo Wischer <twischer@freenet.de>
RODATA can be copied automatically by the bootrom, so no reason not to
allow its use for strings and constants in eboot.c
Revert to pfalcon's original uzlib since the single patch to remove
RODATA is not required.
Rationalize eboot.ld linker script, clean up BSS and init it in code.
Saves 112 bytes of space in the bootloader sector by removing the
extra code associated with literal loads.
* Move CRC out of bootload sector
We added protection to only erase the bootload sector when flashing an
image when the new sector != the old sector. This was intended to
minimize the chance of bricking (i.e. if there was a powerfail during
flashing of the boot sector the chip would be dead).
Unfortunately, by placing the CRC inside the eboot sector *every*
application will have a unique eboot sector (due to the crc/len), so
this protection doesn't work.
Move the CRC into the first 8 bytes of IROM itself. This frees up extra
space in the boot sector and ensures that eboot won't be reflashed
unless there really is an eboot change.
Update newlib to enable the __ieee754_remainder(f) calls required by
std::remainder and others.
Add device test for std::remainder variants.
Fixes#7845
The FSMs that drive the encryption logic are not performance critical,
but they are very large. Build BearSSL using -Os on them, leaving -O2
everywhere else (i.e. encryption) for speed.
Saves 1-2KB of flash for SSL applications.
* Upgrade to upstream newlib 4.0.0 release
Includes 64 bit time_t and 5 years of updates.
Binary incompatible with libraries which use time_t (due to the size
difference). Recompiling with the new newlib should be sufficient for
most libraries, assuming source is available.
* Remove tools/sdk/libc directory, it isn't used anywhere
Somewhere along the line the copy of libc in tools/sdl/libc was taken
out of the build process. Files in there are not used, take add'l time
to build and install on a toolchain release, and just cause confusion.
Remove them.
* Fix 64-bit time for LittleFS
The core was setting 64-bit times automatically on new file creation or
updates, but would fail when attempting to read them back due to 64/32b
confusion.
Now attempt to read 64b time, and if that fails fallback to reading 32b
time to allow both old and new FS to preserve timestamps.
* Update to jjsuwa-sys3175 additions to GCC and newlib
@jjsuwa-sys3175 contributed multiple patches to GCC, included in
the toolchain, as well as a slightly faster pgm_read_byte() macro.
* Rebuild w/addl GCC patches, new BearSSL flags
* Remove copied libgcc.a file, is contained in toolchain
This commit adds W5500 W5100 and ENC28j60 drivers from @njh with credits
They are available in libraries/
An example is added in W5500 examples directory
plus:
* Extract dhcp server from lwip2 and add it to the core as a class.
It must always be present, it is linked and can be called by fw on boot.
So it cannot be stored in a library.
* ethernet: static or dhcp works
* PPPServer: example
* bring WiFi.config() to the lwIP generic interface (argument reorder common function)
* move hostname() from WiFI-STA to generic interface
* remove non readable characters from dhcp-server comments
* dhcp-server: magic_cookie is part of bootp rfc
* fixes from https://github.com/d-a-v/W5500lwIP/issues/17
* enable lwip_hook_dhcp_parse_option()
* +ethernet tcp client example in w5500 library examples
* PoC cache configuration control
Expaned boards.txt.py to allow new MMU options and create revised .ld's
Updated eboot to pass 48K IRAM segments.
Added Cache_Read_Enable intercept to modify call for 16K ICACHE
Update platform.txt to pass new mmu options through to compiler and linker preprocessor.
Added quick example: esp8266/MMU48K
* Style corrections
Added MMU_ qualifier to new defines.
Moved changes into their own file.
Don't know how to fix platformio issue.
* Added detailed description for Cache_Read_Enable.
Updated tools/sizes.py to report correct IRAM size and indicate ICACHE size.
Merged in earlephilhower's work on unaligned exception. Refactored and added
support for store operations and changed the name to be more closely aligned
with its function. Improved crash reporting path.
* Style and MMU_SEC_HEAP corrections.
* Improved asm register usage.
Added some inline functions to aid in byte and short access to iRAM.
* only byte read has been tested
Updated .ld file to work better with platform.io; however, I am still
missing some steps, so platformio will still fail.
* Interesting glitch in boards.txt after github merge. A new board in
master was missing new additions added by boards.txt.py in the PR.
Which the CI flags when it rebuilds boards.txt.
* Support for 2nd Heap, excess IRAM, through umm_malloc.
Adapted changes to umm_malloc, Esp.cpp, StackThunk.cpp,
WiFiClientSecureBearSSL.cpp, and virtualmem.ino to irammem.ino from
@earlephilhower PR #6994.
Reworked umm_malloc to use context pointers instead of copy context.
umm_malloc now supports allocations from IRAM. Added class
HeapSelectIram, ... to aid in selecting alternate heaps,
modeled after class InterruptLock.
Restrict alloc request from ISRs to DRAM.
Never ending improvements to debug printing.
Sec Heap option now pulls in free IRAM left over in the 1st 32K block.
Managed through umm_malloc with HeapSelectIram.
Updated examples.
* Post push CI cleanup.
* Cleanup part II
* Cleanup part III
* Updates to support platformio, maybe.
* Added exception C wrapper replacement.
* CI Cleanup
* CI Cleanup II
Don't know what to do with platformio it doesn't like my .S file.
ifdef out USE_ISR_SAFE_EXC_WRAPPER to block the new assemlby module
from building on platformio only.
* Changes to exc-c-wrapper-handler.S to assemble under platformio.
* For platformio, Correction to toolchain-xtensa include path.
@mcspr, Thankyou!
* Temporarily added --print-memory-usage to ld parameters for cross-checking IRAM size.
* undo change to platform.txt
* correct merge conflict. take 1
* Fixed #if... for building umm_get_oom_count. It was not building when UMM_STATS_FULL was used.
* Commented out XMC support. Compatibility issues with PoC when using 16K ICACHE.
* Corrected size.py, DRAM bracketing changed to not include ICACHE with DRAM total.
* Added additional _context for support of use of UMM_INLINE_METRICS.
Corrected some UMM_POSION missed edits.
* Changes to clear errors and warnings from toolchain 10.1
Several fixes and improvements to example MMU48K.
With the improved optimization in toolchain 10.1 The example divide by 0
exception was failing with a HWDT event instead of its exception handler.
The compiler saw the obscured divide by 0 and replaced it with a break point.
* Isolated incompatable definitions related to _xtos_set_exception_handler.
GDBSTUB definitions are different from the BootROM's.
* Update tools/platformio-build.py
Co-authored-by: Max Prokhorov <prokhorov.max@outlook.com>
* Requested changes
Changed mmu related usages of ETS_... defines to DBG_MMU_...
Cleanup in example MMU48K.ino. Removed stale memory reference macro
and mmu_status print statement. Cleanup printf '\n' to be '\r\n'.
Improved issolation of development debug prints from the rest of the debug prints.
* Corrected comment. And added missing include.
* Improve comment.
* style and comment correction
* Added draft mmu.rst file and updated index.
Updated example HeapMetric.ino to also illustrate use of IRAM
Improved comments in exc-c-wrapper-handler.S. Added insurance IRQ disable.
* Updated mmu.rst
Improved function name uniqueness for is_iram, is_dram, and is_icache by
adding prefix mmu_. Also, made them available outside of a debug build.
Made pointer precision width more specific.
Made some of the static inline functions in mmu_irm.h safe for ISRs by
setting then for always inline.
* Add a default MMU_IRAM_SIZE value for a new CI test to pass.
Extended use 'umm_heap_context_t *_context' argument in ..._core functions
and expanded its usage to reduce unnecessary repeated calls to
umm_info(NULL, false), also removed recursion from umm_info(NULL, true).
Fixed stack buffer length in umm_info_safe_printf_P and heap.cpp.
Added example for creating an IRAM reserve section.
Updated mmu.rst. Grammar and spelling corrections.
* CI appeasement
* CI appeasement with comment correction.
* Ensure SYS always runs with DRAM Heap selected.
* Add/move heap stack overflow/underflow check to Esp.cpp where the event was discarded.
* Improved comment clarity of purpose for IramReserve.ino. Clean up MMU48K.ino
* Added missing #include
* Corrected usage of warning
* CI appeasement and use #message not #pragma message
* Updated git version of eboot.elf to match build version.
Good test catch.
* Remove conditional build option USE_ISR_SAFE_EXC_WRAPPER, always install.
Use the replacement wrapper on non32xfer_exception_handler install.
Added comments to code describing some exception handling issues.
* Updated mmu.rst
* Expanded and clarified comments.
Limited access to some detailed typdefs/prototypes to .cpp
modules, to avoid future build conflicts.
Completed TODO for verifing that the "C" structure struct __exception_frame
matches the ASM version.
Fixed some typo's, code rot, and added some more cases in examaple irammem.ino.
Refactored a little and reordered printing to ease comparison between methods.
Corrected `#ifdef __cplusplus` coverage area. Cleaned up `extern "C" ...` usage.
Fixes issues with including mmu_iram.h or esp8266_undocumented.h in .c files.
* Style fixes and more cleanup
* Style fix
* Remove unnessasary IRAM_ATTR from install_non32xfer_exception_handler
Some comment tuning.
In the context of _xtos_set_exception_handler and the functions it registers,
changed to type int for exception cause type. This is also the type used by gdbstub
and some other Xtensa files I found.
* Do not write more data than requested on PUYA flashes
* Always align flash reads/writes to 4 bytes
* fixup! Always align flash reads/writes to 4 bytes
This commit simplifies the code a bit and fixes a bug that caused wrong number of bytes to be
written
* fixup! Always align flash reads/writes to 4 bytes
* fixup! Always align flash reads/writes to 4 bytes
* Check for result before additional read/write
* Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* fixup! Add overloads for unaligned reads/writes
* Add tests for flashRead/flashWrite
* fixup! Add overloads for unaligned reads/writes
* fixup! Add tests for flashRead/flashWrite
* fixup! Add tests for flashRead/flashWrite
* fixup! Add overloads for unaligned reads/writes
The GCC10 PR accidentally reverted to an older BearSSL commit. There should
be no code changes, but to keep everything clean move it back ahead to the
proper commit.
* remove lwip-v1.4 specific code
* ditto
* ditto
* fix ip4_addr definition
* CI: change debug builds to use IPv6, remove regular IPv6 builds
* ditto
* split pio CI in four (because they last twice the time of the other builds)
* remove option from pio
* remove lwIP-1.4 from doc
* restore pio CI splitting
* fix CI debug6 script
* ditto
* Upgrade to GCC 9.1 toolchain
* Rebuilt using pure GNU binutils and GCC
Remove dependencies on earlier forked GNU utilities (gcc-xtensa,
binutils-gdb-xtensa) and just use GCC sources, unmodified (except for
patches in the esp-quick-toolchain directories).
* Rebuild bearssl using new toolchain
* Fix GDBstub linkage options
GDB works with pure GNU GCC and pure GNU binutils now. Still warnings
galore, but tested with the example sketch in the docs.
* Fix digitalRead alias warning
* Remove gdb stub warnings w/a pragma
* Fix deprecated implicit copy ctors in IP code
Fix some warnings present in GCC8/9 in the IPAddress code
In AddressListIterator there was a copy constructor which simply copied
the structure bit-for-bit. That's the default operation, so remove it
to avoid the warning there.
IPAddress, add a default copy constructor since the other copy
constructors are simply parsing from one format into a native ip_addr_t.
@d-a-v, can you give these a look over and see if they're good (since
IP stuff is really your domain).
* Fix AxTLS alias function defs to match real code
* Fix WiFiClientSecure implicit default copy ctor
These both use shared-ptrs to handle refcnts to allocated data, so using
the default copy constructor is fine (and has been in use for a long
time).
* Dummy size for heap to avoid GCC 8/9 warnings
Make GCC think _heap_start is large enough to avoid the basic (and
incorrect) bounds-checking warnings it produces. The size chosen is
arbitrary and does not affect the actual size of the heap in any way.
* Make heap an undefined extend array
Instead of a bogus size, use an indefinite size for the heap to avoid
GCC warnings
* Trivial tab to space fix
* Update SDFat to remove FatFile warnings
* Fix ticker function cast warnings in GCC 9
The callback function is defined to take a (void*) as parameter, but our
templates let users use anything that fits inside sizeof(void*) to be
passed in. Add pragmas to stop GCC warnings about this, since we
already check the size of the type will fit in the allocated space.
* Remove GCC support fcn that's in ROM
Manually delete the divdi3.so from the libgcc.a library by running the
updated EQT's 9.1-post script.
* Make exceptions work again, get std::regex up
Exceptions are broken on all builds (GCC4.8-9.1) due to the removal of
the PROGMEM non-32b read exception handler (added in the unstable
pre3.0.0).
Build the exception code with -mforce-l32 and patch
accordingly to avoid LoadStore errors.
Apply patches to select portions of the regex lib which use _stype_
(which is now in flash).
* Rebuild Bearssl using latest GCC push
* Automate building of BearSSL and LWIP w/new toolchain
* Workaround g++ template section problem for exception strings
G++ seems to throw out the section attributes for templates. This means
that the __EXCSTR(a synonym for "PSTR()") is ignored and exception.what
strings are stored in RODATA, eating up RAM.
Workaround by using the linker to place the strings keying off their name
("*__exception_what__*").
* Rebuild moving exception.what to unique names
Exception.whats are now all in __exception_what__ and can be moved by
the linker to flash. Works aroung G++ issue with segments being lost in
templates.
* Rebuild with new LWIP locking
* Update to latest libs, save iram
Move two GCC FP support routines out of iram since they are in ROM
already, saving some add'l IRAM. Same list as gcc 4.8.
* Update BearSSL to latest release
* Fix umm_perf reference to ROM function
* Fix "reinterpret_case is not a constexpr" error
In GCC 9 (and 8 from what I read on SO), a cast of a const int to a
function pointer (via explicit or implicit reinterpret_cast) is not a
constexpr.
````
/home/earle/Arduino/hardware/esp8266com/esp8266/cores/esp8266/umm_malloc/umm_performance.cpp:45:36: error: a reinterpret_cast is not a constant expression
45 | int constexpr (*_rom_putc1)(int) = (int (*)(int))(void*)0x40001dcc;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
````
Remove the constexpr, potentially increasing heap usage by 4 bytes in
debug mode.
* Update libc.a to latest rev
* Full rebuild of toolchain and libs
* Upgrade to GCC 9.2, released in August 2019
Add builds for all 5 cross-compiles to pass CI
* Move to --std=gnu++14 (C++14 + GNU extensions)
* Fix Ticker merge conflict
* Fix json merge conflict
* One more merge diff fix
* Reapply Ticker.h casting warning fixes for gcc9
* Update with fixes from Sming repo for PSTR and ASM
* Upgrade to -gnu4 toolchain
* Move to gnu5 build with add'l softFP from ROM
* Move add'l softFP from IRAM to flash
Per @mikee47, we miss sone add'l soft-FP routined in the linker which
makes them end up in IRAM. Move them explicitly into flash, like a
couple others we have already done this for.
* Move to std=c++17/c17 in platform, remove abs/round
Move to C++17 and C17 standards on the compiler options.
Remove "register" from core since it is deprecated.
Remove the #define abs() and #define round() which a) overwrote the
C stdlib definitions, poorly, and b) broke the GCC core code which used
"abs" as an internal function name.
Now abs() returns an integer, and not whatever was being absoluted.
fabs() etc. can be used if users need fload/double suport.
round() returns a double now, which is basically what it was returning
in the original case since adding/subtracting by a FP.
* Use std::abs/round to replace the macro definitions
Per discussion w/@devyte, preserve the abs() and round() functionality
via the using statement.
* Remove using std::abs which conflicted with C lib headers
* Add 2nd arg (exception handler) to ets_isr_t
Disassembly of the ROM shows there are 2 params to the ets_isr_t
callback. The first is the arg passed in, the second is a pointer to an
exception frame where you can get info about when the IRQ happened.
* Move the gdbstub example to a subdir
The Arduino IDE and the build CI don't build it without a subdir, so
make one for gdbstub's example so it's visible and tested.
* Fix ets_irq_arratch redefinition and core IRQ handlers
Remove a duplicated, different declaration for ets_irq_attach from
ets_sys.h. It never really even matched the other declaration in the
same header.
Update the core to IRQ handlers to fix the prototype and include the
2nd, unused frame parameter.
* Actually rebuild the libc.a using GCC 9.2
* Fix SPISlave interrupt attach's 2nd parameter
* Rebuild eboot.elf with GCC 9
* Update to latest SoftwareSerial for Delegate fix
* Upgrade to GCC 9.3
* Rebuild all arch toolchains
* Move to GCC 10.1
* Merge master and fix eboot build
GCC10 now uses `-fno-common` so the eboot global variables were being
placed in IRAM. Adjust the makefile and rebuild to fix.
* Built complete toolchain for all archs
* Pull in latest PSTR changes and fix GCC10.1 build
Somehow the prior GCC build's -mforce32 patch wasn't applying correctly,
but I was still able to get a binary. Fixed. Also pulled in latest
PSTR changes in progmem.h
* Update platform.io to platform C/C++ standards
* Use PR's toolchain in platformio build
* Fix several asm warnings in PIO build
* Optional stack smash protection -fstack-protector
Add a menu to enable GCC's built-in stack smash protection. When a
subroutine goes past its end of stack, generate a crashdump on function
exit like:
````
GCC detected stack overrun
Stack corrupted, stack smash detected.
>>>stack>>>
ctx: cont
sp: 3fffff20 end: 3fffffc0 offset: 0000
3fffff20: 40202955 00000001 0000001c 4020287e
3fffff30: feefeffe 000000fd 00000000 00000000
...
<<<stack<<<
````
Disabled by default because there is a small per-function code overhead
(and CPU time if the function is called very frequently and is very
small).
BearSSL and LWIP are not built using stack smash detection, yet.
* Fix duplicated stc=gnu99/c17 in build
* Dump faulting function PC in stack overflow
Report a fake exception to have the exception decoder print the actual
faulting function. This won't tell you where in the function the issue
happened, but it will tell you the function name first and foremost.
* Rebuild with Platform.io JSON tag in release tgzs
