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Merge branch 'refactor/move_from_xtensa' into 'master'

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Movements from xtensa

Closes IDF-2164

See merge request espressif/esp-idf!10556
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Angus Gratton
2021-03-11 00:24:25 +00:00
parent 429ea0a1c1 d920aa52be
commit fd164b82b6
52 changed files with 510 additions and 731 deletions
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docs/en/api-reference/system/heap_debug.rst
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@@ -80,7 +80,7 @@ Memory corruption can be one of the hardest classes of bugs to find and fix, as
- Increasing the Heap memory debugging `Configuration`_ level to "Light impact" or "Comprehensive" can give you a more accurate message with the first corrupt memory address.
- Adding regular calls to :cpp:func:`heap_caps_check_integrity_all` or :cpp:func:`heap_caps_check_integrity_addr` in your code will help you pin down the exact time that the corruption happened. You can move these checks around to "close in on" the section of code that corrupted the heap.
- Based on the memory address which is being corrupted, you can use :ref:`JTAG debugging <jtag-debugging-introduction>` to set a watchpoint on this address and have the CPU halt when it is written to.
- If you don't have JTAG, but you do know roughly when the corruption happens, then you can set a watchpoint in software just beforehand via :cpp:func:`esp_set_watchpoint`. A fatal exception will occur when the watchpoint triggers. For example ``esp_set_watchpoint(0, (void *)addr, 4, ESP_WATCHPOINT_STORE``. Note that watchpoints are per-CPU and are set on the current running CPU only, so if you don't know which CPU is corrupting memory then you will need to call this function on both CPUs.
- If you don't have JTAG, but you do know roughly when the corruption happens, then you can set a watchpoint in software just beforehand via :cpp:func:`esp_cpu_set_watchpoint`. A fatal exception will occur when the watchpoint triggers. For example ``esp_cpu_set_watchpoint(0, (void *)addr, 4, ESP_WATCHPOINT_STORE``. Note that watchpoints are per-CPU and are set on the current running CPU only, so if you don't know which CPU is corrupting memory then you will need to call this function on both CPUs.
- For buffer overflows, `heap tracing`_ in ``HEAP_TRACE_ALL`` mode lets you see which callers are allocating which addresses from the heap. See `Heap Tracing To Find Heap Corruption`_ for more details. If you can find the function which allocates memory with an address immediately before the address which is corrupted, this will probably be the function which overflows the buffer.
- Calling :cpp:func:`heap_caps_dump` or :cpp:func:`heap_caps_dump_all` can give an indication of what heap blocks are surrounding the corrupted region and may have overflowed/underflowed/etc.