assemblyaddressing-modeinfineon

Tricore Disassembling "Constants"

Can someone here explain me, how the TC17** assembler works out the "movh.a and lea" addressing (hex), and how i can calculate them for myself if i have an configuration value like shown in my picture, which is defined as a "constant" or a "global".

What i want to do is, creating/assemble this 32-bit instruction for myself, but i do not make any proccess the last days. Sure, i know how to assemble with Eclipse Toolchain, but i cant use this toolchain in my programm. I am programming with PHP but this doesnt really matter, if i know how to work out this.

As example, here is a picture with the IDApro View of the commands i have to assembly:

screenshot of IDA-Pro

As 32-Bit Hex instruction it looks like this: 

ASM: movh.a    a15, #@HIS(configuration_value_1)
HEX: 91 70 01 F8

ASM: lea   a15, [a15]@LOS(configuration_value_1)
HEX: D9 FF E4 67

What i want to do now is to work out that HEX-assembler instructions, with the right addressing to my variable. In this case its located at: "0x80177DA4".

In the instruction set, its explained like this:

Screenshot: movh.a command
Screenshot: lea + long offset addressing mode

Solution

  • What's causing you problem? Everything is shown in your pictures, it's just a simple matter of extracting bits.

    It's easier if you reassemble the words from the little endian form. Thus:

    movh.a = F8017091. You can see the constant is actually 8017 (no surprise there). lea = 67E4FFD9 This is a little bit trickier due to the silly encoding, so let's convert the top 16 bits to binary: 0110 0111 1110 0100. Now rearrange them to get 011111 0110 100100, then back to hex: 7DA4

    So the full address is 80177DA4.