ARM Compiler toolchain Using the Linker - ARM Information Center

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10.2 Platforms supported by the BPABI 10.2.1 Linker support for the BPABI 10.2.2 Linker support for ARM Linux 10.2.3 See also BPABI and SysV shared libraries and executables The Base Platform Application Binary Interface (BPABI) defines three platform models based on the type of shared library: Bare metal The bare metal model is designed for an offline dynamic loader or a simple module loader. References between modules are resolved by the loader directly without any additional support structures. DLL-like The dynamically linked library (DLL) like model sacrifices transparency between the dynamic and static library in return for better load and run-time efficiency. SysV The System V (SysV) model masks the differences between dynamic and static libraries. ARM Linux uses this format. The ARM linker supports all three BPABI models enabling you to link a collection of objects and libraries into a: • bare metal executable image • BPABI DLL or SysV shared object • BPABI or SysV executable file. The linker can generate SysV executables and shared libraries with all required data for ARM Linux. However, you must specify other command-line options and libraries in addition to the --shared or --sysv options. If all the correct input options and libraries are specified, you can use the ELF file without any post-processing. Tasks Building Linux Applications with the ARM ® Compiler toolchain and GNU Libraries: • Chapter 3 Using the ARM Compiler toolchain to build a Linux application or library. Concepts • About the Base Platform Application Binary Interface (BPABI) on page 10-3 • Concepts common to all BPABI models on page 10-5. Reference Linker Reference: • --dll on page 2-49 • --shared on page 2-146 • --sysv on page 2-170. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-4 ID080411 Non-Confidential
10.3 Concepts common to all BPABI models 10.3.1 See also BPABI and SysV shared libraries and executables The linker enables you to build Base Platform Application Binary Interface (BPABI) shared libraries and to link objects against shared libraries. The following concepts are common to all BPABI models: • symbol importing • symbol exporting • versioning • visibility of symbols. Concepts • About importing and exporting symbols for BPABI models on page 10-6 • Symbol visibility for BPABI models on page 10-7 • Automatic import and export for BPABI models on page 10-9 • Manual import and export for BPABI models on page 10-10 • Symbol versioning for BPABI models on page 10-11 • RW compression for BPABI models on page 10-12. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-5 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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Compiler Reference: • __attribute
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