AN3350 datasheet(85/185 Pages) STMICROELECTRONICS

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AN3350

Working with the ELF linker

Doc ID 018512 Rev 2

85/185

where memory_spec is one or more lines in this format:

segmentName (flags) : ORIGIN = address, LENGTH = length [> fileName]

Parameters

segmentName

The name of the segment. This name must be a consecutive string of alphanumeric and/or

underscore (_) characters.

flags

Access flags for the output file (Phdr.p_flags). Flags can be any combination of:

●

R -

read

●

W -

write

●

X -

executable code

address

One of the following:

●

A memory address (optionally including the memory space name), in hexadecimal

format, such as 0x800400.

●

An AFTER command — If you do not want to compute the addresses using offsets, you

can use the AFTER(name [,name]) command to tell the linker to place the memory

segment after the specified segment.

Note:

If you specify multiple memory segments as parameters for AFTER, the linker uses the

segment with the highest memory address. This is useful when you do not know which

overlay takes up the most memory space.

length

One of the following:

●

A value greater than zero indicating the size (in bytes) of the segment. If you try to put

more code and data into a memory segment than your specified length allows, the

linker generates an error at link time.

●

Zero (linker automatically calculates the segment size)

Note:

The linker does not perform overflow checking when you specify zero. If you do not leave

enough memory free to hold the entire segment, you will get unexpected results. For this

reason, we recommend that whenever you specify zero, you also use the AFTER keyword to

specify the start address.

> fileName

An optional argument to have the linker write the segment to a binary file on disk instead of

an ELF program header. The linker places this file into the same folder as the ELF output

file. This option has two variants:

• > fileName — writes the segment to a new file

• >> fileName — appends the segment to an existing file

In Example 20, the linker places overlay1 and overlay2 immediately after the code

segment. The linker places data immediately after the overlay segments.

Example 20 MEMORY example

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