ARM Compiler toolchain Using the Linker - ARM Information Center

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BPABI and SysV shared libraries and executables 10.20 Automatic dynamic symbol table rules in the BPABI DLL-like model 10.20.1 See also The following rules apply to the Base Platform Application Binary Interface (BPABI) DLL-like model: Executable An undefined symbol reference is an undefined symbol error. Global symbols with STV_HIDDEN or STV_INTERNAL visibility are never exported to the dynamic symbol table. Global symbols with STV_PROTECTED or STV_DEFAULT visibility are not exported to the dynamic symbol table unless --export_all or --export_dynamic is set. DLL An undefined symbol reference is an undefined symbol error. Global symbols with STV_HIDDEN or STV_INTERNAL visibility are never exported to the dynamic symbol table. Note STV_HIDDEN or STV_INTERNAL global symbols that are required for relocation can be placed in the dynamic symbol table, however the linker changes them into local symbols to prevent them from being accessed from outside the shared library. Global symbols with STV_PROTECTED or STV_DEFAULT visibility are always exported to the dynamic symbol table. You can manually export and import symbols using the EXPORT and IMPORT steering file commands. Use the --edit command-line option to specify a steering file command. Concepts • What is a steering file? on page 7-23 Reference • Steering file command summary on page 7-25 • Steering file format on page 7-26. Linker Reference: • --edit=file_list on page 2-53 • --export_all, --no_export_all on page 2-64 • --export_dynamic, --no_export_dynamic on page 2-65 • --keep_protected_symbols on page 2-91 • EXPORT on page 3-2 • IMPORT on page 3-4. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-24 ID080411 Non-Confidential
10.21 Addressing modes in the BPABI DLL-like model 10.21.1 See also BPABI and SysV shared libraries and executables The main difference between the bare metal and Base Platform Application Binary Interface (BPABI) DLL-like models is the addressing mode used to access imported and own-program code and data. There are four options available that correspond to categories in the BPABI specification: • None • Direct references • Indirect references • Relative static base address references. Selection of the required addressing mode is controlled by the following command-line options: • --pltgot • --pltgot_opts. Reference Linker Reference: • --pltgot=type on page 2-121 • --pltgot_opts=mode on page 2-122. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-25 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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8.20 Restrictions on placing __at s
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8.21.1 See also Using scatter files
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8.23 Placing a key in flash memory
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8.25 Placement of sections with ove
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8.25.1 See also Using scatter files
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8.27 Example of placing code in a r
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8.29 Example of placing ARM C++ lib
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8.31 Reserving an empty region Usin
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8.32 About creating regions on page
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8.33 Overalignment of execution reg
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Page 249 and 250: 11.2 Example scatter file for the B
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