Type 3, two load regions and non contiguous execution regions

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5.4.3. Type 3, 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: Specifies the load and execution address of the region containing the RO output section.
‑‑rw‑base address2: 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.

Example 5.27 shows the scatter-loading description equivalent to using ‑‑ro‑base 0x010000 ‑‑rw‑base 0x040000 ‑‑split.

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. Its execution address is 0x040000.
The ER_ZI execution region is placed immediately following the end of the preceding execution region, ER_RW.

Example 5.27. 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	.
    }
}

Relocatable load regions example variant

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.

Example 5.28 shows the scatter-loading description equivalent to using ‑‑ro‑base 0x010000 ‑‑rw‑base 0x040000 ‑‑reloc ‑‑split .

Example 5.28. Relocatable load regions

LR_1 0x010000 RELOC
{
     ER_RO + 0
     {
         * (+RO)
     }
}

LR2 0x040000 RELOC
{
     ER_RW + 0
     {
         * (+RW)
     }

     ER_ZI +0
     {
         * (+ZI)
     }
}

Copyright © 2007 ARM Limited. All rights reserved.	ARM DUI 0377A
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