ARM Compiler toolchain Using the Linker - ARM Information Center

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3.3 Partial linking model 3.3.1 See also Linking models supported by armlink Partial linking: • eliminates duplicate copies of debug sections • merges the symbol tables into one • leaves unresolved references unresolved • merges common data (COMDAT) groups • generates an object that can be used as input to a subsequent link step. A single output file is produced that can be used as input to a subsequent link step. If the linker finds multiple entry points in the input files it generates an error because the output file can have only one entry point. To link with this model, use the --partial command-line option. Other linker command-line options supported by this model are: • --edit=file_list • --exceptions_tables=action. Note If you use partial linking, you cannot refer to the component objects by name in a scatter file. Therefore, you might have to update your scatter file. Concepts • What is a steering file? on page 7-23. Reference • Steering file format on page 7-26. Linker Reference: • --edit=file_list on page 2-53 • --exceptions_tables=action on page 2-62 • --partial on page 2-119 • Chapter 3 Linker steering file command reference. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 3-4 ID080411 Non-Confidential
Linking models supported by armlink 3.4 Base Platform Application Binary Interface (BPABI) linking model 3.4.1 See also The Base Platform Application Binary Interface (BPABI) is a meta-standard for third parties to generate their own platform-specific image formats. This means that the BPABI model produces as much information as possible without focusing on any specific platform. Be aware of the following: • You cannot use scatter-loading. However, the Base Platform linking model is an extension to the BPABI model that supports scatter-loading. • The model assumes that shared objects cannot throw a C++ exception. • The default value of the --pltgot option is direct. • Symbol versioning must be used to ensure that all the required symbols are available at load time. To link with this model, use the --bpabi command-line option. Other linker command-line options supported by this model are: • --dll • --force_so_throw, --no_force_so_throw • --pltgot=type • --ro_base=address • --rosplit • --rw_base=address • --rwpi. Concepts • Base Platform linking model on page 3-6 • Concepts common to both BPABI and SysV linking models on page 3-9 • About symbol versioning on page 10-27. Reference Linker Reference: • --bpabi on page 2-24 • --dll on page 2-49 • --force_so_throw, --no_force_so_throw on page 2-73 • --pltgot=type on page 2-121 • --ro_base=address on page 2-135 • --rosplit on page 2-137 • --rw_base=address on page 2-139 • --rwpi on page 2-140. 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. 3-5 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 and 10: Chapter 2 Overview of the linker Th
Page 11 and 12: Concepts • Demand paging on page
Page 13 and 14: 2.3 Linker command-line options lis
Page 15 and 16: • --keep_protected_symbols on pag
Page 17 and 18: • --eager_load_debug, --no_eager_
Page 19 and 20: 2.5 What the linker outputs 2.5.1 S
Page 21 and 22: Chapter 3 Linking models supported
Page 23: 3.2 Bare-metal linking model 3.2.1
Page 27 and 28: 3.5.1 See also • There are restri
Page 29 and 30: 3.7 Concepts common to both BPABI a
Page 31 and 32: Image structure and generation •
Page 33 and 34: 4.1.1 See also Image structure and
Page 35 and 36: 4.3 Load view and execution view of
Page 37 and 38: 4.4 Methods of specifying an image
Page 39 and 40: 4.5 Types of simple image 4.5.1 See
Page 47 and 48: 4.10 About specifying an initial en
Page 49 and 50: 4.11.2 Example 4.11.3 See also The
Page 51 and 52: 4.13 Section alignment with the lin
Page 53 and 54: Reference Linker Reference: • --a
Page 55 and 56: 4.16 Overview of veneers 4.16.1 See
Page 57 and 58: 4.18 Veneer types 4.18.1 See also I
Page 59 and 60: 4.20 Reuse of veneers when scatter-
Page 61 and 62: 4.22 About weak references and defi
Page 63 and 64: BL init_foo ;Rest of code END 4.22.
Page 65 and 66: Image structure and generation 4.24
Page 67 and 68: 4.25 Specifying user libraries when
Page 69 and 70: 4.27 Use of the strict family of op
Page 71 and 72: 5.1 Elimination of common debug sec
Page 73 and 74: 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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