ARM Compiler toolchain Using the Linker - ARM Information Center

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2.1 About the linker 2.1.1 See also Overview of the linker The linker, armlink, combines the contents of one or more object files with selected parts of one or more object libraries to produce: • an ARM ELF image • a partially linked ELF object that can be used as input in a subsequent link step • ELF files that can be demand-paged efficiently • a shared object, compatible with the Base Platform Application Binary Interface (BPABI) or System V release 4 (SysV) specification, or a BPABI or SysV executable file. The linker can: • link ARM code and Thumb ® and Thumb-2 code • generate interworking veneers to switch processor state when required • generate inline veneers or long branch veneers, where required, to extend the range of branch instructions • perform link-time code generation (LTCG) • pass a profiling data file to the compiler to perform Profiler-guided optimizations • automatically select the appropriate standard C or C++ library variants to link with, based on the build attributes of the objects it is linking • enable you to specify the locations of code and data within the system memory map, using either a command-line option or a scatter file • perform Read/Write data compression to minimize ROM size • perform unused section elimination to reduce the size of your output image • control the generation of debug information in the output file • generate a static callgraph and list the stack usage • control the contents of the symbol table in output images • show the sizes of code and data in the output • use linker feedback to remove individual unused functions • accept GNU ld scripts, with restrictions. Note A 64-bit version of armlink is provided that can utilize the greater amount of memory available to processes on 64-bit operating systems. It supports all the features that are supported by the 32-bit version of armlink in this release. Tasks Introducing the ARM Compiler toolchain: • Changing to the 64-bit linker on page 2-7. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 2-2 ID080411 Non-Confidential
Concepts • Demand paging on page 4-23 • About linker feedback on page 5-7 • About link-time code generation on page 5-11 • Chapter 3 Linking models supported by armlink • Chapter 4 Image structure and generation • Chapter 5 Using linker optimizations • Chapter 6 Getting information about images • Chapter 7 Accessing and managing symbols with armlink • Chapter 8 Using scatter files • Chapter 9 GNU ld script support in armlink • Chapter 10 BPABI and SysV shared libraries and executables • Chapter 11 Features of the Base Platform linking model. Using the Compiler: • About Profiler-guided optimization on page 5-3. Other information Overview of the linker 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. 2-3 ID080411 Non-Confidential
Page 1 and 2: ® ARM Copyright © 2010-2011 ARM.
Page 3 and 4: Contents ARM Compiler toolchain Usi
Page 5 and 6: Contents 7.15 Creating a symdefs fi
Page 7 and 8: Chapter 1 Conventions and feedback
Page 9: Chapter 2 Overview of the linker Th
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Page 15 and 16: • --keep_protected_symbols on pag
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Page 21 and 22: Chapter 3 Linking models supported
Page 23 and 24: 3.2 Bare-metal linking model 3.2.1
Page 25 and 26: Linking models supported by armlink
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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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Using scatter files Example 8-25 Po
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Using scatter files • The ER_ZI e
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Using scatter files Example 8-29 Sc
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Chapter 9 GNU ld script support in
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9.2 Typical use cases for using ld
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Reference Linker Reference: • --l
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9.5 Recommendations for using ld sc
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.data : { __data_start = .; *(.data
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9.6.4 See also .got 0 : { *(.got.pl
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9.7.1 See also } .dynamic : { *(.dy
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9.8.1 See also { *(.bss .bss.*) . =
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Chapter 10 BPABI and SysV shared li
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BPABI and SysV shared libraries and
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10.3 Concepts common to all BPABI m
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10.5 Symbol visibility for BPABI mo
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10.6 Automatic import and export fo
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10.8 Symbol versioning for BPABI mo
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10.10 Linker options for SysV model
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10.13 Addressing modes in the SysV
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10.17 Linker options for bare metal
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10.21 Addressing modes in the BPABI
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10.23 About symbol versioning 10.23
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10.25 Example of creating versioned
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10.27 Linker options for enabling i
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Chapter 11 Features of the Base Pla
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Features of the Base Platform linki
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11.2 Example scatter file for the B
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Features of the Base Platform linki
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