ARM Compiler toolchain Using the Linker - ARM Information Center

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Image structure and generation 4.7 Type 2 image, one load region and non-contiguous execution regions 4.7.1 Load view RAM ROM 4.7.2 Execution view A Type 2 image consists of a single load region, and three execution regions in execution view. The RW execution region is not contiguous with the RO execution region. This approach is used, for example, for ROM-based embedded systems, where RW data is copied from ROM to RAM at startup: RW output section RO output section Load view 0xA000 Copy/ decompress Single load region 0x0000 Use the following command for images of this type: armlink --ro_base 0x0 --rw_base 0xA000 ZI output section RW output section RO output section Execution view ZI execution region RW execution region --rw-base value RO execution region --ro-base value Figure 4-4 Simple type 2 image In the load view, the single load region consists of the RO and RW output sections placed consecutively, for example, in ROM. Here, the RO region is a root region, and the RW region is non-root. The ZI output section does not exist at load time. It is created at runtime. In the execution view, the first execution region contains the RO output section and the second execution region contains the RW and ZI output sections. The execution address of the region containing the RO output section is the same as its load address, so the RO output section does not have to be moved. That is, it is a root region. The execution address of the region containing the RW output section is different from its load address, so the RW output section is moved from its load address (from the single load region) to its execution address (into the second execution region). The ZI execution region, and its output section, is placed contiguously with the RW execution region. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 4-13 ID080411 Non-Confidential
4.7.3 See also Image structure and generation Use armlink options --ro_base address to specify the load and execution address for the RO output section, and --rw_base exec_address to specify the execution address of the RW output section. If you do not use the --ro_base option to specify the address, the default value of 0x8000 is used by armlink. For an embedded system, 0x0 is typical for the --ro_base value. If you do not use the --rw_base option to specify the address, the default is to place RW directly above RO (as in a Type 1 image). Use the --zi_base command-line option to specify the base address of a ZI execution region. Note The execution region for the RW and ZI output sections cannot overlap any of the load regions. Concepts • The image structure on page 4-3 • Input sections, output sections, regions, and Program Segments on page 4-5 • Load view and execution view of an image on page 4-6 • Type 1 image, one load region and contiguous execution regions on page 4-11. Reference Linker Reference: • --ro_base=address on page 2-135 • --rw_base=address on page 2-139 • --zi_base=address on page 2-193. ARM DUI 0474C Copyright © 2010-2011 ARM. All rights reserved. 4-14 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 and 24: 3.2 Bare-metal linking model 3.2.1
Page 25 and 26: Linking models supported by armlink
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 41: 4.6.3 See also Image structure and
Page 45 and 46: 4.8.3 See also Image structure and
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
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
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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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