[Answered] Assembler language reference manual ...

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hydrabus
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Re: Assembler language reference manual ...

Postby hydrabus » Sat Oct 22, 2016 8:57 pm

1) A way to Count Leading Zeros of a 32bits unsigned integer
Does such feature exist on ESP32 CPU ?
Yes, using NSAU instruction. Compiler will generate it if you use GCC __builtin_clz() intrinsic.
Thanks for the hint and the fact it support asm instruction for that I will test it later to check it generate the right asm code...
2) In a near future write an IDA Pro Processor Module for ESP32 (as only ESP8266 is supported ...)
I have extended the 8266 ida-python plugin with some of the ESP32 instructions (not added FP yet) and am using it personally in day-to-day debugging using ScratchABit disassembler. I can share what i have if you want to work on this.
Could you share your plugin ?
My email is bvernoux at hydrabus.com
4) A way to retrieve number of cycles executed (with accuracy of CPU clock so 240MHz) on 64bits if possible (but I can survive with 32bits), CPU cycle counter (like on ARM CM3... => DWTBase->CYCCNT) is perfect for that (even if timer can be also used ...)
32-bit CPU cycle counter can be queried by reading CCOUNT special register, or equivalently, using xthal_get_ccount function defined in Xtensa HAL.
Thanks for the hint I will check that

ESP_igrr
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Re: Assembler language reference manual ...

Postby ESP_igrr » Mon Oct 24, 2016 3:45 am

Could you share your plugin ?
My email is bvernoux at hydrabus.com
I've sent you an email.

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hydrabus
Posts: 29
Joined: Wed Nov 25, 2015 11:45 pm
Location: France
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Re: Assembler language reference manual ...

Postby hydrabus » Mon Oct 24, 2016 9:08 pm

Could you share your plugin ?
My email is bvernoux at hydrabus.com
I've sent you an email.
Thanks for all I have replied to your Email

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kolban
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Re: [Answered] Assembler language reference manual ...

Postby kolban » Fri Jan 12, 2018 4:58 am

Has there been an update on the assembler language reference manual availability?
Free book on ESP32 available here: https://leanpub.com/kolban-ESP32

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