ARM Compiler toolchain Using the Linker - ARM Information Center

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7.12 Image symbols 7.12.1 See also Accessing and managing symbols with armlink Image symbols are generated by the linker when you use a command-line option to create a simple image. The following table shows the image symbols: Symbol Section type Description If you are using a scatter file, the image symbols are undefined. If your code accesses any of these symbols, you must treat them as a weak reference. The standard implementation of __user_setup_stackheap() uses the value in Image$$ZI$$Limit. Therefore, if you are using a scatter file you must manually place the stack and heap. You can do this either: • in a scatter file using one of the following methods: — define separate stack and heap regions called ARM_LIB_STACK and ARM_LIB_HEAP — define a combined region containing both stack and heap called ARM_LIB_STACKHEAP. • by re-implementing __user_setup_stackheap() to set the heap and stack boundaries. Tasks • Linker-defined symbols that are not defined when scatter-loading on page 8-11 • Specifying stack and heap using the scatter file on page 8-12. Concepts • Types of simple image on page 4-10 • About weak references and definitions on page 4-32. Migration and Compatibility: • C and C++ library changes between RVCT v2.2 and RVCT v3.0 on page 9-5. Reference Using ARM ® C and C++ Libraries and Floating-Point Support: • __user_setup_stackheap() on page 2-60. Table 7-4 Image symbols Image$$RO$$Base Output Address of the start of the RO output section. Image$$RO$$Limit Output Address of the first byte beyond the end of the RO output section. Image$$RW$$Base Output Address of the start of the RW output section. Image$$RW$$Limit Output Address of the byte beyond the end of the ZI output section. (The choice of the end of the ZI region rather than the end of the RW region is to maintain compatibility with legacy code.) Image$$ZI$$Base Output Address of the start of the ZI output section. Image$$ZI$$Limit Output Address of the byte beyond the end of the ZI output section. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 7-15 ID080411 Non-Confidential
7.13 Input section symbols 7.13.1 See also Accessing and managing symbols with armlink Input section symbols are generated by the linker for every input section present in the image. The following table shows the input section symbols: Symbol Section type Description If your code refers to the input-section symbols, it is assumed that you expect all the input sections in the image with the same name to be placed contiguously in the image memory map. If your scatter file places input sections non-contiguously, the linker issues an error. This is because the use of the base and limit symbols over non-contiguous memory usually produces unpredictable and undesirable effects. Tasks • Chapter 8 Using scatter files. Table 7-5 Section-related symbols SectionName$$Base Input Address of the start of the consolidated section called SectionName. SectionName$$Length Input Length of the consolidated section called SectionName (in bytes). SectionName$$Limit Input Address of the byte beyond the end of the consolidated section called SectionName. Concepts • Input sections, output sections, regions, and Program Segments on page 4-5. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 7-16 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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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
Page 75 and 76: 5.4 Elimination of unused virtual f
Page 77 and 78: • --scatter=file on page 2-142. C
Page 79 and 80: 5.6.1 See also Using linker optimiz
Page 81 and 82: 3. Creates the output image. 5.7.3
Page 83 and 84: 5.9 How the linker chooses a compre
Page 85 and 86: 5.11 How compression is applied 5.1
Page 87 and 88: 5.13 Inlining functions with the li
Page 89 and 90: Reference Assembler Reference: •
Page 91 and 92: 5.16 About reordering of tail calli
Page 93 and 94: 5.18 About merging comment sections
Page 95 and 96: 6.1 Linker options for getting info
Page 97 and 98: 6.3 Example of using the --info lin
Page 99 and 100: 6.4 How to find where a symbol is p
Page 101 and 102: • Load$$LR$$ load region symbols
Page 103 and 104: 7.2 Accessing linker-defined symbol
Page 105 and 106: 7.4 Image$$ execution region symbol
Page 107 and 108: 7.5.1 See also Accessing and managi
Page 109 and 110: 7.7 Region name values when not sca
Page 111 and 112: 7.9 Importing linker-defined symbol
Page 113: 7.11 Section-related symbols 7.11.1
Page 117 and 118: 7.15 Creating a symdefs file 7.15.1
Page 119 and 120: 7.17 Reading a symdefs file 7.17.1
Page 121 and 122: 7.18.2 See also 0x0000814D T __argv
Page 123 and 124: 7.20 Specifying steering files on t
Page 125 and 126: 7.22 Steering file format 7.22.1 Se
Page 127 and 128: 7.24 Using $Super$$ and $Sub$$ to p
Page 129 and 130: Using scatter files • Images with
Page 131 and 132: 8.2 When to use scatter-loading 8.2
Page 133 and 134: • --startup=symbol, --no_startup
Page 135 and 136: 8.4.1 See also Concepts • About s
Page 137 and 138: 8.5.1 See also } SRAM 0x8000 0x8000
Page 139 and 140: 8.7 Specifying stack and heap using
Page 141 and 142: 8.9 Creating root execution regions
Page 143 and 144: 8.9.2 See also Tasks • Using the
Page 145 and 146: 8.11 Placing functions and data at
Page 147 and 148: Using scatter files RAM 0x200000 (0
Page 149 and 150: Using scatter files • Using __at
Page 151 and 152: Developing Software for ARM ® Proc
Page 153 and 154: } } .ANY1(+RO) ; evenly distributed
Page 155 and 156: 8.14 Examples of using placement al
Page 157 and 158: Using scatter files 8.15 Example of
Page 159 and 160: 8.16 Examples of using sorting algo
Page 161 and 162: 8.17 Selecting veneer input section
Page 163 and 164: 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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Change Topics affected Revisions fo
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