米6体育平台手机版

SLAU131V October 2004 – February 2020

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8.5.5.2.6 Alignment With Padding

As with align, you can tell the linker to place an output section at an address that falls on an n-byte boundary, where n is a power of 2, by using the palign keyword. In addition, palign ensures that the size of the section is a multiple of its placement alignment restrictions, padding the section size up to such a boundary, as needed.

For example, the following code lines allocate .text on a 2-byte boundary within the PMEM area. The .text section size is guaranteed to be a multiple of 2 bytes. Both statements are equivalent:

   .text: palign(2) {} > PMEM

   .text: palign = 2 {} > PMEM

If the linker adds padding to an initialized output section then the padding space is also initialized. By default, padding space is filled with a value of 0 (zero). However, if a fill value is specified for the output section then any padding for the section is also filled with that fill value. For example, consider the following section specification:

.mytext: palign(8), fill = 0xffff {} > PMEM

In this example, the length of the .mytext section is 6 bytes before the palign operator is applied. The contents of .mytext are as follows:

addr content
---- -------
0000 0x1234
0002 0x1234
0004 0x1234

After the palign operator is applied, the length of .mytext is 8 bytes, and its contents are as follows:

addr content
---- -------
0000 0x1234
0002 0x1234
0004 0x1234
0006 0xffff

The size of .mytext has been bumped to a multiple of 8 bytes and the padding created by the linker has been filled with 0xff.

The fill value specified in the linker command file is interpreted as a 16-bit constant. If you specify this code:

.mytext: palign(8), fill = 0xff {} > PMEM

The fill value assumed by the linker is 0x00ff, and .mytext will then have the following contents:

addr content
---- -------
0000 0x1234
0002 0x1234
0004 0x1234
0006 0x00ff

If the palign operator is applied to an uninitialized section, then the size of the section is bumped to the appropriate boundary, as needed, but any padding created is not initialized.

The palign operator can also take a parameter of power2. This parameter tells the linker to add padding to increase the section's size to the next power of two boundary. In addition, the section is aligned on that power of 2 as well. For example, consider the following section specification:

.mytext: palign(power2) {} > PMEM

Assume that the size of the .mytext section is 120 bytes and PMEM starts at address 0x10020. After applying the palign(power2) operator, the .mytext output section will have the following properties:

  name     addr          size     align
-------    ----------    -----    -----
.mytext    0x00010080    0x80     128