ARM Compiler toolchain Using the Linker - ARM Information Center

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10.24 Symbol versioning script file 10.24.1 See also BPABI and SysV shared libraries and executables You can embed the commands to produce symbol versions in a script file that is specified by the command-line option --symver_script=file. Using this option automatically enables symbol versioning. The script file supports the same syntax as the GNU ld linker. Using a script file enables you to associate a version with an earlier version. A steering file can be provided in addition to the embedded symbol method. If you choose to do this then your script file must match your embedded symbols and use the Backus-Naur Form (BNF) notation: version_definition ::= version_name "{" symbol_association* "}" [depend_version] ";" The version_name is a string containing the name of the version. depend_version is a string containing the name of a version that this version_name depends on. This version must have already been defined in the script file. Version names are not significant, but it helps to choose readable names, for example: symbol_association ::= "local:" | "global:" | symbol_name ";" where: • "local:" indicates that all subsequent symbol_names in this version definition are local to the shared object and are not versioned. • "global:" indicates that all subsequent symbol_names belong to this version definition. There is an implicit "global:" at the start of every version definition. • symbol_name is the name of a global symbol in the static symbol table. Note If you use a script file then the version definitions and symbols associated with them must match. The linker warns you if it detects any mismatch. Concepts • About symbol versioning on page 10-27 • Example of creating versioned symbols on page 10-29 • Linker options for enabling implicit symbol versioning on page 10-31. Reference Linker Reference: • --symver_script=file on page 2-167. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-28 ID080411 Non-Confidential
10.25 Example of creating versioned symbols 10.25.1 See also BPABI and SysV shared libraries and executables 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 10-1 Creating versioned symbols, embedded symbols The corresponding script file, which includes the addition of dependency information so that ver2 depends on ver1 is: ver1 { global: foo; bar; local: *; }; ver2 { global: foo; } ver1; Example 10-2 Creating versioned symbols script file Concepts • About symbol versioning on page 10-27 • Linker options for enabling implicit symbol versioning on page 10-31. Reference Linker Reference: • --symver_script=file on page 2-167. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-29 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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