ARM Compiler toolchain Using the Linker - ARM Information Center

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Using scatter files The following table shows the effect of +offset when used with the OVERLAY attribute. REGION1 appears immediately before REGION2 in the scatter file: The following example shows the use of relative offsets with overlays and the effect on execution region addresses: EMB_APP 0x8000{ CODE 0x8000 { *(+RO) } } REGION1 is set with OVERLAY # REGION1 Base = CODE limit REGION1 +0 OVERLAY { module1.o(*) } # REGION2 Base = REGION1 Base REGION2 +0 OVERLAY { module2.o(*) } # REGION3 Base = REGION2 Base = REGION1 Base REGION3 +0 OVERLAY { module3.o(*) } # REGION4 Base = REGION3 Limit + 4 Region4 +4 OVERLAY { module4.o(*) } Table 8-7 Using relative offset in overlays +offset REGION2 Base Address NO REGION1 Limit + YES +0 REGION1 Base Address YES REGION1 Limit + Example 8-17 Example of relative offset in overlays If the length of the non-overlay area is unknown, a zero relative offset can be used to specify the start address of an overlay so that it is placed immediately after the end of the static section. You can use the following command-line options to add extra debug information to the image: • --emit_debug_overlay_relocs • --emit_debug_overlay_section. These permit an overlay-aware debugger to track which overlay is currently active. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-45 ID080411 Non-Confidential
8.25.1 See also Using scatter files Concepts • Using __at sections to place sections at a specific address on page 8-37. Linker Reference: • About load region descriptions on page 4-5 • About execution region descriptions on page 4-8 • Considerations when using a relative address +offset for load regions on page 4-16 • Considerations when using a relative address +offset for execution regions on page 4-17. Reference • Accessing linker-defined symbols on page 7-4. Linker Reference: • --emit_debug_overlay_relocs on page 2-54 • --emit_debug_overlay_section on page 2-55 • Load region attributes on page 4-7 • Execution region attributes on page 4-11 • Address attributes for load and execution regions on page 4-14. Compiler Reference: • __attribute__((section("name"))) variable attribute on page 5-72. Other information • ABI for the ARM Architecture: Support for Debugging Overlaid Programs, http://infocenter.arm.com/help/topic/com.arm.doc.ihi0049-/index.html ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-46 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$$ execution region symbol
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7.5.1 See also Accessing and managi
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7.7 Region name values when not sca
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7.9 Importing linker-defined symbol
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7.11 Section-related symbols 7.11.1
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7.13 Input section symbols 7.13.1 S
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7.15 Creating a symdefs file 7.15.1
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7.17 Reading a symdefs file 7.17.1
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Page 123 and 124: 7.20 Specifying steering files on t
Page 125 and 126: 7.22 Steering file format 7.22.1 Se
Page 127 and 128: 7.24 Using $Super$$ 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
Page 165 and 166: 8.20 Restrictions on placing __at s
Page 167 and 168: 8.21.1 See also Using scatter files
Page 169 and 170: 8.23 Placing a key in flash memory
Page 171: 8.25 Placement of sections with ove
Page 175 and 176: 8.27 Example of placing code in a r
Page 177 and 178: 8.29 Example of placing ARM C++ lib
Page 179 and 180: 8.31 Reserving an empty region Usin
Page 181 and 182: 8.32 About creating regions on page
Page 183 and 184: 8.33 Overalignment of execution reg
Page 185 and 186: 8.35 Expression evaluation in scatt
Page 187 and 188: 8.37 Equivalent scatter-loading des
Page 189 and 190: Using scatter files Example 8-23 Po
Page 191 and 192: Using scatter files Example 8-25 Po
Page 193 and 194: Using scatter files • The ER_ZI e
Page 195 and 196: Using scatter files Example 8-29 Sc
Page 197 and 198: Chapter 9 GNU ld script support in
Page 199 and 200: 9.2 Typical use cases for using ld
Page 201 and 202: Reference Linker Reference: • --l
Page 203 and 204: 9.5 Recommendations for using ld sc
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Page 207 and 208: 9.6.4 See also .got 0 : { *(.got.pl
Page 209 and 210: 9.7.1 See also } .dynamic : { *(.dy
Page 211 and 212: 9.8.1 See also { *(.bss .bss.*) . =
Page 213 and 214: Chapter 10 BPABI and SysV shared li
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Page 217 and 218: 10.3 Concepts common to all BPABI m
Page 219 and 220: 10.5 Symbol visibility for BPABI mo
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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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BPABI and SysV shared libraries and
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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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