ARM Compiler toolchain Using the Linker - ARM Information Center

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8.31.1 See also In this example, the linker generates the symbols: Image$$STACK$$ZI$$Base = 0x7f0000 Image$$STACK$$ZI$$Limit = 0x800000 Image$$STACK$$ZI$$Length = 0x10000 Image$$HEAP$$ZI$$Base = 0x800000 Image$$HEAP$$ZI$$Limit = 0x810000 Image$$HEAP$$ZI$$Length = 0x10000 Using scatter files Figure 8-4 Reserving a region for the stack Note The EMPTY attribute applies only to an execution region. The linker generates a warning and ignores an EMPTY attribute used in a load region definition. The linker checks that the address space used for the EMPTY region does not coincide with any other execution region. Concepts Linker Reference: • About execution region descriptions on page 4-8. Reference • Image$$ execution region symbols on page 7-6. Linker Reference: • Execution region attributes on page 4-11. 0x810000 0x800000 0x7F0000 ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-53 ID080411 Non-Confidential Heap Stack Limit Base Limit Base
8.32 About creating regions on page boundaries 8.32.1 See also Using scatter files You can produce an ELF file that can be loaded directly to a target with each execution region starting at a page boundary. The linker provides the following built-in functions to help create load and execution regions on page boundaries: • AlignExpr • GetPageSize. Note Alignment on an execution region causes both the load address and execution address to be aligned. The following example produces an ELF file with each execution region starting on a new page: LR1 GetPageSize() + SizeOfHeaders() { ER_RO +0 { *(+RO) } ER_RW +GetPageSize() { *(+RW) } ER_ZI +0 { *(+ZI) } } Example 8-21 Creating regions on page boundaries The default page size 0x8000, is used. You can change the page size with the --pagesize command-line option. Concepts • Demand paging on page 4-23 • Overalignment of execution regions and input sections on page 8-56 • Expression evaluation in scatter files on page 8-58 • Using expression evaluation in a scatter file to avoid padding on page 8-59. Reference Linker Reference: • --pagesize=pagesize on page 2-118 • Load region attributes on page 4-7 • Execution region attributes on page 4-11 • Example of aligning a base address in execution space but still tightly packed in load space on page 4-41 • AlignExpr(expr, align) function on page 4-42 ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 8-54 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
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
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Page 137 and 138: 8.5.1 See also } SRAM 0x8000 0x8000
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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: 8.31 Reserving an empty region Usin
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
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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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BPABI and SysV shared libraries and
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10.17 Linker options for bare metal
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BPABI and SysV shared libraries and
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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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