ARM Compiler toolchain Using the Linker - ARM Information Center

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Using scatter files 8.40 Type 3 image, two load regions and non-contiguous execution regions Type 3 images consist of two load regions in load view and three execution regions in execution view. They are similar to images of type 2 except that the single load region in type 2 is now split into two load regions. Relocate and split load regions using the following linker options: --reloc The combination --reloc --split makes an image similar to simple type 3, but the two load regions now have the RELOC attribute. --ro_base=address1 --rw_base=address2 Specifies the load and execution address of the region containing the RO output section. Specifies the load and execution address for the region containing the RW output section. --split Splits the default single load region (that contains the RO and RW output sections) into two load regions. One load region contains the RO output section and one contains the RW output section. The following example shows the scatter-loading description equivalent to using --ro_base=0x010000 --rw_base=0x040000 --split: Example 8-26 Multiple load regions LR_1 0x010000 ; The first load region is at 0x010000. { ER_RO +0 ; The address is 0x010000. { * (+RO) } } LR_2 0x040000 ; The second load region is at 0x040000. { ER_RW +0 ; The address is 0x040000. { * (+RW) ; All RW sections are placed consecutively into this region. } ER_ZI +0 ; The address is 0x040000 + size of ER_RW region. { * (+ZI) ; All ZI sections are placed consecutively into this region. } } In this example: • This description creates an image with two load regions, named LR_1 and LR_2, that have load addresses 0x010000 and 0x040000. • The image has three execution regions, named ER_RO, ER_RW and ER_ZI, that contain the RO, RW, and ZI output sections respectively. The execution address of ER_RO is 0x010000. • The ER_RW execution region is not contiguous with ER_RO, because its execution address is 0x040000. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-65 ID080411 Non-Confidential
Using scatter files • The ER_ZI execution region is placed immediately following the end of the preceding execution region, ER_RW. 8.40.1 Relocatable load regions example variant 8.40.2 See also This type 3 image also consists of two load regions in load view and three execution regions in execution view. However, --reloc is used to specify that the two load regions now have the RELOC attribute. The following example shows the scatter-loading description equivalent to using --ro_base 0x010000 --rw_base 0x040000 --reloc --split: LR_1 0x010000 RELOC { ER_RO + 0 { * (+RO) } } LR2 0x040000 RELOC { ER_RW + 0 { * (+RW) } } ER_ZI +0 { * (+ZI) } Example 8-27 Relocatable load regions Concepts Linker Reference: • About load region descriptions on page 4-5 • 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 Linker Reference: • --reloc on page 2-132 • --ro_base=address on page 2-135 • --rw_base=address on page 2-139 • --split on page 2-154 • Load region attributes on page 4-7 • Address attributes for load and execution regions on page 4-14. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-66 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
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 and 172: 8.25 Placement of sections with ove
Page 173 and 174: 8.25.1 See also Using scatter files
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: Using scatter files Example 8-25 Po
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
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Page 209 and 210: 9.7.1 See also } .dynamic : { *(.dy
Page 211 and 212: 9.8.1 See also { *(.bss .bss.*) . =
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Page 217 and 218: 10.3 Concepts common to all BPABI m
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Page 237 and 238: 10.21 Addressing modes in the BPABI
Page 239 and 240: 10.23 About symbol versioning 10.23
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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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