Arm assembly programming

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In arm assembly code, I am seeing the below line where "=" is used. what exactly this operator is used in arm.

ldr r0, =CONSTANT

what constant we can use, like any address or a variable which holds the address or a value?

shall i use it like

ldr r0, =0x5 (5 is a value)

or

ldr r0, =0x400000 (where 0x400000 is an address)

or

ldr r0, =ADDR_PTR (where ADDR_PTR is a variable hoding a address)

Is all the above things correct or i am understanding something wrong here.

Posted 2-Sep-15 6:11am

chandrAN2&

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Richard MacCutchan · Answer 1 · 2015-09-02T06:58:00

Solution 1

Assuming from your question you do not have a copy of a reference manual, you can find the answers quite easily by following: https://www.google.com/search?q=arm+assembly[^].

Posted 2-Sep-15 6:58am

Richard MacCutchan

Comments

Sergey Alexandrovich Kryukov 2-Sep-15 13:06pm

Fair enough, a 5.
Note that there are different compilers for the same instruction set architecture; they can have different syntax.
—SA

Richard MacCutchan 2-Sep-15 14:01pm

Really? I would never have guessed.

Sergey Alexandrovich Kryukov 2-Sep-15 15:51pm

:-)

chandrAN2& 3-Sep-15 0:46am

Any link for Arm reference Manual.

Richard MacCutchan 3-Sep-15 3:01am

Have you tried any of the links I gave you?

chandrAN2& 3-Sep-15 0:46am

particularly talking about syntax and semantics..

chandrAN2& 4-Sep-15 6:28am

I have tried few links , in most of the article mainly they are talking about basics of arm programming like registers and operating modes and all those stuffs.
But not about the arm syntax like characters used in arm assembly like =, ! etc..

Richard MacCutchan 4-Sep-15 6:38am

Then you need to widen your search.

Arm assembly programming

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