Which folder contains the source code for Nios II built in function

[Chris039]

Hi, 

In the bsp generated using Nios II, there is one file <bsp folder>/HAL/inc/io.h. You may easily find this in the hello world design. 

In line below,

#define IORD(BASE, REGNUM) \
__builtin_ldwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)))

the IORD is defined as __builtin_ldwio function. I found the list of the built in function available in 

https://splichal.eu/gccsphinx-final/html/gcc/extensions-to-the-c-language-family/target-builtins/altera-nios-ii-built-in-functions.html

Can you point me to the file that define the function of __builtin_ldwio?

Thanks

[Chris039]

I am not compiling my source code using Nios Eclipse. I am compiling using gcc. I guess there is missing .c or .h file that define the function which gives me error below

[KellyJialin_Goh]

Greetings,

Is it possible for you to send your design files so that we can compile and have a look further on our side? Which version of NIOS are you using?

Thank you.

Regards,

Kelly

[Chris039]

Quartus Pro 22.2

you may find the design in Hello world example design

[KellyJialin_Goh]

Hi,

I will get back to you soon as it needs more time for investigation. May we know the version of GCC compiler that you are using?

Thank you,

Regards,

Kelly

[Chris039]

I think it doesn’t matter which gcc compiler version. It is the source file for nios built in function. 
Sure, do let me know when you found the code 

[KellyJialin_Goh]

Hi Chris,

Could you kindly check out this link:https://www.intel.com/content/www/us/en/support/programmable/support-resources/devices/ips-nios2-ide-tutorial.html and download the source files(any version works fine) and unzip them. Unzip once with command tar -xf on linux environement or unzip twice on Windows environment.

Regards,

Kelly

[Chris039]

Thank you for the link, Kelly

Could you point me to the files that contain the functions like __builtin_ldwio?

[KellyJialin_Goh]

Hi,

After you download the link and unzip the files, the directory to find _builtin_ldwio is : Downloads\acds-16.0.tar\acds-16.0\acds-16.0\gcc-5.2\gcc\testsuite\gcc.target\nios2 and locate to nios2-builtin-io.c .You should be able to see the source code in the file.

Thank you.

Regards,

Kelly

[KellyJialin_Goh]

Hi,

Any updates from your side?

Thank you.

Regards,

Kelly

[KellyJialin_Goh]

Hi,

Any updates from your side? Did you managed to find the file from your side?

Thank you.

Regards,

Kelly

[Chris039]

Hi Kelly,

This file use the built-in function but not defining the function. I am looking for the file that is defining the function.

[KellyJialin_Goh]

Hi,

You may check out this link https://www.intel.com/content/www/us/en/docs/programmable/683242/current/nios-ii-custom-instruction-overview.html and download the pdf, check out chapter 3.2 Built in Function and User defined Macros. I believe the file you refer to is the system.h for custom instructions.

Regards,

Kelly

[Chris039]

 The below define IORD as __builtin_ldwio but how do I know what is this function __builtin_ldwio doing? I would like to know the source code for the built in function

#define IORD(BASE, REGNUM) \
__builtin_ldwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)))

The document that you have shared chapter 3.2.X lists out all the built in function available but there is no source code for each function.

[KellyJialin_Goh · Accepted solution]

Hi Chris,

Sorry about the bad news. Unfortunately after consulting the engineering team, we are unable to provide the definition on how to use the built in function and the source code as it is private and confidential. However, do feel free to use the macros which is the IORD or IOWR that calls the built in function.

I will set your case to close-pending if I do not hear from you the next few days. Thank you.

Regards,

Kelly

[KellyJialin_Goh]

Hi,

I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, Please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.

p/s: If any answer from the community or Intel Support are helpful, please feel free to give best answer or rate 9/10 survey.

Thank you.

Regards,

Kelly Jialin, GOH