ARM Compiler toolchain Using the Linker - ARM Information Center

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BPABI and SysV shared libraries and executables 10.16 Changes to command-line defaults with the SysV memory model 10.16.1 See also The ARM Compiler toolchain does not provide shared libraries containing the C and C++ system libraries. The intended usage model of the System V (SysV) support is to use the system libraries that come with the platform. For example, in ARM Linux this is libc.so. To use libc.so, the linker applies the following changes to the default behavior: • --arm_linux sets the default options required for ARM Linux • --no_ref_cpp_init is set to prevent the inclusion of the ARM C++ initialization code • the linker defines the required symbols to ensure compatibility with libc.so • --force_so_throw is set which forces the linker to keep exception tables. Reference Linker Reference: • --arm_linux on page 2-13 • --force_so_throw, --no_force_so_throw on page 2-73 • --ref_cpp_init, --no_ref_cpp_init on page 2-130 • --sysv on page 2-170. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-20 ID080411 Non-Confidential
10.17 Linker options for bare metal and DLL-like models 10.17.1 See also BPABI and SysV shared libraries and executables Use the following command-line options to build bare metal executables and dynamically linked library (DLL) like models for a platform OS: Command-line options Description If you are developing applications or DLL for a specific platform OS, based around the Base Platform Application Binary Interface (BPABI), you must use the following information in conjunction with the platform documentation: • bare metal and DLL-like memory model • mandatory symbol versioning in the BPABI DLL-like model • automatic dynamic symbol table rules in the BPABI DLL-like model • addressing modes in the BPABI DLL-like model • C++ initialization in the BPABI DLL-like model. If you are implementing a platform OS, you must use this information in conjunction with the BPABI specification. Concepts • 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 • C++ initialization in the BPABI DLL-like model on page 10-26 • Related linker command-line options for the BPABI DLL-like model on page 10-32. Reference • --base_platform on page 2-18 • --bpabi on page 2-24 • --dll on page 2-49. Table 10-3 Turning on BPABI support --base_platform to use scatter-loading with Base Platform ABI (BPABI) --bpabi to produce a BPABI executable --bpabi --dll to produce a BPABI DLL Other information • Base Platform ABI for the ARM Architecture, http://infocenter.arm.com/help/topic/com.arm.doc.ihi0037-/index.html ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 10-21 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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