AN3350 datasheet(82/185 Pages) STMICROELECTRONICS

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Working with the ELF linker

AN3350

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Doc ID 018512 Rev 2

Hexadecimal (base 16) integers start with 0x or 0X (a zero followed by an X), followed by

numerals in the range of zero through nine, and/or characters A through F. Here are some

examples of valid hexadecimal integers you could put in your linker command file:

●

_somenumber = 0x999999FF;

●

_fudgefactorspace = 0X123245EE;

●

_hexonyou = 0xFFEE;

To create a negative decimal integer, use the minus sign (-) in front of the number, as in:

●

_decimal_number = -123456;

11.3.6

File selection

When defining the contents of a SECTION block, you must specify the source files that are

contributing their sections. The standard way of doing this is to simply list the files, as shown

in Example 17.

Example 17 Source files listing

SECTIONS {

.example_section :

{

main.o

(.text)

file2.o (.text)

file3.o (.text)

}

In a large project, the list can become very long. For this reason, the * keyword can be used

to represent the filenames of every file in your project. Note that since we have already

added the .text sections from the files main.o, file2.o, and file3.o, the '*' keyword

will not add the .text sections from those files again.

* (.text)

11.3.7

Writing data to memory

You can write data directly to memory using the WRITEx commands in the linker command

file.

●

WRITEB

writes a byte

●

WRITEH

writes a two-byte half word

●

WRITEW

writes a four-byte word.

●

WRITES

writes a string. The data is inserted at the section’s current address.

The example in Example 18 shows examples of the WRITEx commands.

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