ARM Compiler toolchain Using the Linker - ARM Information Center

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10.22 C++ initialization in the BPABI DLL-like model 10.22.1 See also BPABI and SysV shared libraries and executables A dynamically linked library (DLL) supports the initialization of static constructors with a table that contains references to initializer functions that perform the initialization. The table is stored in an ELF section with a special section type of SHT_INIT_ARRAY. For each of these initializers there is a relocation of type R_ARM_TARGET1 to a function that performs the initialization. The ELF Application Binary Interface (ABI) specification describes R_ARM_TARGET1 as either a relative form, or an absolute form. The ARM C libraries use the relative form. For example, if the linker detects a definition of the ARM C library __cpp_initialize__aeabi, it uses the relative form of R_ARM_TARGET1 otherwise it uses the absolute form. Concepts • Linker options for bare metal and DLL-like models on page 10-21 • Bare metal and DLL-like memory model on page 10-22 • Mandatory symbol versioning in the BPABI DLL-like model on page 10-23 • Automatic dynamic symbol table rules in the BPABI DLL-like model on page 10-24 • Addressing modes in the BPABI DLL-like model on page 10-25 • Related linker command-line options for the BPABI DLL-like model on page 10-32. Using ARM ® C and C++ Libraries and Floating-Point Support: • Initialization of the execution environment and execution of the application on page 2-55 • C++ initialization, construction and destruction on page 2-56. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-26 ID080411 Non-Confidential
10.23 About symbol versioning 10.23.1 Version 10.23.2 Default version 10.23.3 Creating versioned symbols 10.23.4 See also BPABI and SysV shared libraries and executables Symbol versioning records extra information about symbols imported from, and exported by, a dynamic shared object. The dynamic loader uses this extra information to ensure that all the symbols required by an image are available at load time. Symbol versioning enables shared object creators to produce new versions of symbols for use by all new clients, while maintaining compatibility with clients linked against old versions of the shared object. Symbol versioning adds the concept of a version to the dynamic symbol table. A version is a name that symbols are associated with. When a dynamic loader tries to resolve a symbol reference associated with a version name, it can only match against a symbol definition with the same version name. Note A version might be associated with previous version names to show the revision history of the shared object. While a shared object might have multiple versions of the same symbol, a client of the shared object can only bind against the latest version. This is called the default version of the symbol. By default, the linker does not create versioned symbols for a non Base Platform Application Binary Interface (BPABI) shared object. Reference • Symbol versioning script file on page 10-28. Using the fromelf Image Converter: • --symbolversions, --no_symbolversions on page 4-72. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-27 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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Page 249 and 250: 11.2 Example scatter file for the B
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