www.ceva-dsp.com

Visual Linker

Finalpresentation

Visual Linker

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Background and Vision

Problem Domain

System Design

Challenges, Problems and Conclusions

So What Next?

Outline

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What is DSP?

Who is Ceva?

What is a Linker anyway?

Background

Source code• *.c, *.h

Compiler• *.asm

Assembler• *.o , *.lib

Linker• *.a - executable

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What is SmartNcode?

Why linking in DSP environment is difficult?

What is linker script file?

Background Background (cont.)

SmartNcode™Software Development Tools

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Background Background (cont.) ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; CEVA' s SmartNcode IDE generated Li nker scri pt fi l e. ; ; V9. 2, CEVA- XC. ; ; Copyri ght (C) CEVA Inc. Al l ri ghts reserved. ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;

obj ects: Obj ect_fi l e1. o Obj ect_fi l e2. o l i brari es: l i brary1. l i b

l i brary2. l i b cl asses: myCodeInt [C: 1000 , 0x200 ] i nternal ; defi nes a cl ass i n i nternal code memory myDataExt [D: 20000, 0x1000] external ; defi nes a cl ass i n external data memory myUni fi ed [U: 50000, 0x5000] external ; defi nes a cl ass i n external uni fi ed memory code: segment 0 i nttbl cal l _saved_store_restore_sect l o . text l o ctor_sect data: segment 0 dummy_sect l o si ze 0x8 . data l o al i gn 0x8 const_data l o al i gn 0x8 ARG_SECT_END at next nol oad __MALLOC_SECT l o al i gn 0x8 nol oad si ze 0x4000 __STACK_SECT l o al i gn 0x8 si ze 0x4000 data_cl one l o al i gn 0x4 cl one . data const_data_cl one l o al i gn 0x4 cl one const_data

User Define Classes

Compiled Libraries Compiled user source files

Default Code class

Default Data class

Sections

Sections

Directives

Our Solution : Visual Linker

Our solution will give the user the tools to write her linking script visually. The user will be able to:

Create memory classes on a visualized memory layout drawing canvas.

Locate Code and Data section in the memory classes by simple drag and drop operations.

Configure the linker directives by editing sections and class properties.

load and generate linking script files

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Our Solution : Visual Linker (cont.)

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Problem Domain

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The Visual Linker will provide an easy, user friendly visual linking configuration tool.

The Visual Linker will ease the linker usage and reduce scripting mistakes.

The Visual Linker will minimize the time and effort one need to invest in the linking script writing.

Vision

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System Design

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Visual Linker, what?Lets have a look!

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Challenges, Problems and Conclusions

Challenges:

Re-implementing GUI views and models in Qt C++.|

Developing and implementing linker algorithms with multiple constrains.

Interfacing with Ceva-DSP IDE platform.

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Challenges, Problems and Conclusions

Problems:

Parsing post-complied files wasn’t enough – required additional processing.

Zoom-In and Zoom-Out support was complicated both algorithmically and visually.

The linker complexity was hard to grasp when implementing the linker script parser

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Challenges, Problems and Conclusions

Conclusions:

The project was much bigger than a standard project for two team members.

As a result, implementation for some features were suspended.

The core components of the initial design were successfully implemented.

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So What Next? Full integration with the (CEVA) Linker

Full directives and core types support

Delivering the visual linker to CEVA

Distributing the Visual linker to CEVA’s clients along side with the rest of the binary tools

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Questions?

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THANK YOU!