review of blackfin syntax moves and adds 1) what we already know and have to remember to apply 2)...

Review of Blackfin Review of Blackfin SyntaxSyntaxMoves and AddsMoves and Adds

1)1) What we already know and What we already know and have to remember to applyhave to remember to apply

2)2) What we need to learn What we need to learn

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Assembly code “stub”Assembly code “stub”

Each function written in assembly code has Each function written in assembly code has the same general lookthe same general look

1.1. The necessary #include files and Section nameThe necessary #include files and Section name2.2. Declaration of the function as “global” combined Declaration of the function as “global” combined

with labels for start and end of functionwith labels for start and end of function3.3. Setting size of link operation and using LINK Setting size of link operation and using LINK

instruction to save the return addressinstruction to save the return address4.4. Unlink used with JUMP(P0) instruction to cause Unlink used with JUMP(P0) instruction to cause

the function to return “to calling program”the function to return “to calling program”5.5. R0 used for return parameterR0 used for return parameter6.6. Required code with Documentation of codeRequired code with Documentation of code

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Example 1 -- stub code Example 1 -- stub code

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Store/Write codeStore/Write code

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LoadLoad/read/read

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Move Move RegisterRegister

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Conditional move Conditional move registerregister

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Half register movesHalf register moves

Zero extendedZero extended

Sign extendedSign extended

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What does zero What does zero extendedextendedand sign extended and sign extended mean?mean? 1 1 0 0 1 1 1 0 1 1 0 1 1 1 1 1

0 1 0 0 1 1 1 0 1 1 0 1 1 1 1 1

1 1 0 0 1 1 1 0 1 1 0 1 1 1 1 1

0 1 0 0 1 1 1 0 1 1 0 1 1 1 1 1

0 In all bits

0 In all bits

“sign bit” In all bits

1 In all bits

0 In all bits

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32 bit adds32 bit adds

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16 bit adds16 bit adds

VIDEOtwo

16-bitAdds

At same time

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Some assign Some assign statementstatementLoad immediateLoad immediate

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Some assign Some assign statementstatementLoad immediateLoad immediate

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Safe way of doing Safe way of doing immediate loadsimmediate loads