billraser
Posts: 2
Joined: Wed Nov 21, 2018 6:03 pm

Access to ARM documentation

Wed Nov 21, 2018 6:23 pm

I am familiar with assembly language on other computers but I am new to ARM assembly language. I have started reading "Raspberry Pi Assembly Language" by Bruce Smith. That book provides an intro to the ARMv8 A32 and T32 instruction sets, but nothing about the A64 instructions on my Pi 3. I went to infocenter.arm.com to download the ARMv8-A Reference Manual as a PDF and that site said "This document is only available in a PDF version to registered ARM customers."

I posted a question to ARM support: How much does it cost for a home hobbyist programmer to become an ARM customer in order to download this one manual? Do they have a discount for non-corporate developers?

I realize the manual is big (5,000+ pages) but I am only interested in the "A" chapters.

Where to others go for the complete descriptions of the ARMv8 instructions?

jahboater
Posts: 4193
Joined: Wed Feb 04, 2015 6:38 pm

Re: Access to ARM documentation

Wed Nov 21, 2018 6:52 pm

This is a good document. Its easy to read but with enough information to program with:

https://www.element14.com/community/ser ... Manual.pdf

The ARMv8 ARM is a huge document available here. Just download the PDF.

https://developer.arm.com/docs/ddi0487/ ... re-profile

jahboater
Posts: 4193
Joined: Wed Feb 04, 2015 6:38 pm

Re: Access to ARM documentation

Wed Nov 21, 2018 7:12 pm

Of course another source of information is the output from the compiler.

gcc -Os -S -fverbose-asm hello.c -o hello.s

If you use GCC version 7 or later, it will intersperse the assembler with the C source lines.
That makes it very easy to find your way around and work out whats going on.

billraser
Posts: 2
Joined: Wed Nov 21, 2018 6:03 pm

Re: Access to ARM documentation

Wed Nov 21, 2018 9:24 pm

Thank you. I was looking for the pseudo-code and the instruction bit encoding for A32 and A64 instructions, and found them here:

https://static.docs.arm.com/ddi0487/da/ ... 1542810092

Thanks for your assistance.

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