ARM Compiler toolchain Using the Linker - ARM Information Center

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10.26 About embedded symbols 10.26.1 See also BPABI and SysV shared libraries and executables You can add specially-named symbols to input objects that cause the linker to create symbol versions. These symbols are of the form: • name@version for a non-default version of a symbol • name@@version for a default version of a symbol. You must define these symbols, at the address of the function or data, as that you want to export. The symbol name is divided into two parts, a symbol name name and a version definition version. The name is added to the dynamic symbol table and becomes part of the interface to the shared object. Version creates a version called ver if it does not already exist and associates name with the version called ver. The following example places the symbols foo@ver1, foo@@ver2, and bar@@ver1 into the object symbol table: int old_function(void) __asm__("foo@ver1"); int new_function(void) __asm__("foo@@ver2"); int other_function(void) __asm__("bar@@ver1"); Example 10-3 Creating versioned symbols, embedded symbols The linker reads these symbols and creates version definitions ver1 and ver2. The symbol foo is associated with a non-default version of ver1, and with a default version of ver2. The symbol bar is associated with a default version of ver1. There is no way to create associations between versions with this method. Reference Using the Compiler: • Using compiler and linker support for symbol versions on page 5-34. Using the Assembler: • Chapter 5 Writing ARM Assembly Language. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-30 ID080411 Non-Confidential
10.27 Linker options for enabling implicit symbol versioning 10.27.1 See also BPABI and SysV shared libraries and executables If you have to version your symbols to force static binding, but you do not care about the version number that they are given, you can use implicit symbol versioning. Use the command-line option --symver_soname to turn on implicit symbol versioning. Where a symbol has no defined version, the linker uses the SONAME of the file being linked. This option cannot be combined with embedded symbols or a script file. Reference • About symbol versioning on page 10-27 • Symbol versioning script file on page 10-28 • About embedded symbols on page 10-30. Linker Reference: • --symver_soname on page 2-168. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-31 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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8.35 Expression evaluation in scatt
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8.37 Equivalent scatter-loading des
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Using scatter files Example 8-23 Po
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Page 239 and 240: 10.23 About symbol versioning 10.23
Page 241: 10.25 Example of creating versioned
Page 245 and 246: Chapter 11 Features of the Base Pla
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Page 249 and 250: 11.2 Example scatter file for the B
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