Compiler/DRA829V: Tool reports error on MCR and MRC instructions

Rizwan Ahmad

Part Number: DRA829V

Tool/software: TI C/C++ Compiler

Hi,

Code that I am trying to build is:

MCR     15, 0, r3, c6, c2, 0
...
MRC     15, 0, r3, c6, c1, 4

I am getting these errors:

[E0004] First operand must be a valid coprocessor number
            MCR     15, 0, r3, c6, c2, 0
[E0004] Coprocessor operation code must be an absolute constant
            MCR     15, 0, r3, c6, c2, 0
[E0004] Coprocessor information field must be an absolute constant
            MCR     15, 0, r3, c6, c2, 0
[E0004] First operand must be a valid coprocessor number
            MRC     15, 0, r3, c6, c1, 4
[E0004] Coprocessor operation code must be an absolute constant
            MRC     15, 0, r3, c6, c1, 4
[E0004] Coprocessor information field must be an absolute constant
            MRC     15, 0, r3, c6, c1, 4

Please point to ARM instruction reference document for ti-arm 18.12.1.lts

Much appreciated!
Rizwan

over 5 years ago

0 George Mock over 5 years ago

TI__Guru**** 251300 points

Those instructions must be written ...

        MCR     p15, #0, r3, c6, c2, #0
        MRC     p15, #0, r3, c6, c1, #4

I hate to admit that, at this moment, I'm not sure why. I'll get back to you on that.

Thanks and regards,

-George

0 George Mock over 5 years ago in reply to George Mock

TI__Guru**** 251300 points

The ARM Instruction Set Reference Guide describes the MCR and MRC instructions in detail. It states that the first operand must begin with p, and the second and last operands must use the # prefix.

Thanks and regards,

-George

0 Rizwan Ahmad over 5 years ago in reply to George Mock

Intellectual 676 points

thanks George!

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Compiler/DRA829V: Tool reports error on MCR and MRC instructions