ARM Compiler toolchain Using the Linker - ARM Information Center

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BPABI and SysV shared libraries and executables • C++ initialization in the BPABI DLL-like model on page 10-26 • About symbol versioning on page 10-27 • Symbol versioning script file on page 10-28 • Example of creating versioned symbols on page 10-29 • About embedded symbols on page 10-30 • Linker options for enabling implicit symbol versioning on page 10-31. Reference • Related linker command-line options for the SysV memory model on page 10-19 • Related linker command-line options for the BPABI DLL-like model on page 10-32. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-2 ID080411 Non-Confidential
BPABI and SysV shared libraries and executables 10.1 About the Base Platform Application Binary Interface (BPABI) 10.1.1 See also Many embedded systems use an operating system to manage the resources on a device. In many cases this is a large, single executable with a Real-Time Operating System (RTOS) that tightly integrates with the applications. Other more complex Operating Systems (OS) are referred to as a platform OS, for example, ARM Linux. These have the ability to load applications and shared libraries on demand. To run an application or use a shared library on a platform OS, you must conform to the Application Binary Interface (ABI) for the platform and also the ABI for the ARM architecture. This can involve substantial changes to the linker output, for example, a custom file format. To support such a wide variety of platforms, the ABI for the ARM architecture provides the Base Platform Application Binary Interface (BPABI). The BPABI provides a base standard from which a platform ABI can be derived. The linker produces a BPABI conforming ELF image or shared library. A platform specific tool called a post-linker translates this ELF output file into a platform-specific file format. Post linker tools are provided by the platform OS vendor. The following figure shows the BPABI tool flow. Tool: compiler linker postlinker Format: .c .o .axf bin/exe Language ABI BPABI Concepts • Platforms supported by the BPABI on page 10-4 • Concepts common to all BPABI models on page 10-5. Figure 10-1 BPABI tool flow Other information • Base Platform ABI for the ARM Architecture, http://infocenter.arm.com/help/topic/com.arm.doc.ihi0037-/index.html. Platform binary ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-3 ID080411 Non-Confidential
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® ARM Copyright © 2010-2011 ARM.
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Contents ARM Compiler toolchain Usi
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Contents 7.15 Creating a symdefs fi
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Chapter 1 Conventions and feedback
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Chapter 2 Overview of the linker Th
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Concepts • Demand paging on page
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2.3 Linker command-line options lis
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• --keep_protected_symbols on pag
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• --eager_load_debug, --no_eager_
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2.5 What the linker outputs 2.5.1 S
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Chapter 3 Linking models supported
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3.2 Bare-metal linking model 3.2.1
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Linking models supported by armlink
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3.5.1 See also • There are restri
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3.7 Concepts common to both BPABI a
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Image structure and generation •
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4.1.1 See also Image structure and
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4.3 Load view and execution view of
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4.4 Methods of specifying an image
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4.5 Types of simple image 4.5.1 See
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4.10 About specifying an initial en
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4.11.2 Example 4.11.3 See also The
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4.13 Section alignment with the lin
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Reference Linker Reference: • --a
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4.16 Overview of veneers 4.16.1 See
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4.18 Veneer types 4.18.1 See also I
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4.20 Reuse of veneers when scatter-
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4.22 About weak references and defi
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BL init_foo ;Rest of code END 4.22.
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Image structure and generation 4.24
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4.25 Specifying user libraries when
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4.27 Use of the strict family of op
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5.1 Elimination of common debug sec
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5.3 Elimination of unused sections
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5.4 Elimination of unused virtual f
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• --scatter=file on page 2-142. C
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5.6.1 See also Using linker optimiz
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3. Creates the output image. 5.7.3
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5.9 How the linker chooses a compre
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5.11 How compression is applied 5.1
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5.13 Inlining functions with the li
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Reference Assembler Reference: •
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5.16 About reordering of tail calli
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5.18 About merging comment sections
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6.1 Linker options for getting info
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6.3 Example of using the --info lin
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6.4 How to find where a symbol is p
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• Load$$LR$$ load region symbols
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7.2 Accessing linker-defined symbol
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7.4 Image$$ execution region symbol
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7.5.1 See also Accessing and managi
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7.7 Region name values when not sca
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7.9 Importing linker-defined symbol
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7.11 Section-related symbols 7.11.1
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7.13 Input section symbols 7.13.1 S
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7.15 Creating a symdefs file 7.15.1
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7.17 Reading a symdefs file 7.17.1
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7.18.2 See also 0x0000814D T __argv
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7.20 Specifying steering files on t
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7.22 Steering file format 7.22.1 Se
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7.24 Using $Super$$ and $Sub$$ to p
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Using scatter files • Images with
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8.2 When to use scatter-loading 8.2
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• --startup=symbol, --no_startup
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8.4.1 See also Concepts • About s
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8.5.1 See also } SRAM 0x8000 0x8000
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8.7 Specifying stack and heap using
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8.9 Creating root execution regions
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8.9.2 See also Tasks • Using the
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8.11 Placing functions and data at
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Using scatter files RAM 0x200000 (0
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Using scatter files • Using __at
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Developing Software for ARM ® Proc
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} } .ANY1(+RO) ; evenly distributed
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8.14 Examples of using placement al
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Using scatter files 8.15 Example of
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8.16 Examples of using sorting algo
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8.17 Selecting veneer input section
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