[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

hydrabus wrote:1) A way to Count Leading Zeros of a 32bits unsigned integer
Does such feature exist on ESP32 CPU ?

ESP_igrr wrote: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...

hydrabus wrote:2) In a near future write an IDA Pro Processor Module for ESP32 (as only ESP8266 is supported ...)

ESP_igrr wrote: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

hydrabus wrote: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 ...)

ESP_igrr wrote: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

hydrabus wrote:Could you share your plugin ?
My email is bvernoux at hydrabus.com


I've sent you an email.

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

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

ESP_igrr wrote:
hydrabus wrote: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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