Zilog ZUSBOPTS - Manual (Page 288)

Invoking the Linker UM017105-0511
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Zilog Developer Studio II – ZNEO™
User Manual
Segments. Each address space consists of various segments. Segments are named logical
partitions of data or code that form a continuous block of memory. Segments with the
same name residing in different modules are concatenated together at link time. Segments
are assigned to an address space and can be relocatable or absolute. Relocatable segments
can be randomly allocated by the linker; absolute segments are assigned a physical address
within its address space. See
Segments – see page 213 for more information about using
predefined segments, defining new segments, and attaching code and data to segments.
The linker performs the following functions:
•
Reads in relocatable object modules and library files and linker commands.
•
Resolves external references.
•
Assigns absolute addresses to relocatable segments of each address space and group.
•
Generates a single executable module to download into the target system.
•
Generates a map file.
Invoking the Linker
The linker is automatically invoked when your project is open and you click the Build but-
ton or
Rebuild All button on the Build toolbar (see the Build Toolbar section on page 18).
The linker then links the corresponding object modules of the various source files in your
project and any additional object/library modules specified in the
Objects and Libraries
page in the Project Settings dialog box (discussed on page 64 ).The linker uses the linker
command file to control how these object modules and libraries are linked. The linker
command file is automatically generated by ZDS II if the Always Generate from Settings
button is selected (see the
Always Generate from Settings section on page 61). You can
add additional linker commands with the Additional Linker Directives dialog box (dis-
cussed on page 62 ). If you want to override the automatically generated linker command
file, select the Use Existing button (see the Use Existing section on page 63).
The linker can also be invoked from the DOS command line or through the ZDS II Com-
mand Processor. For more information about invoking the linker from the DOS command
line, see
Running ZDS II from the Command Line – see page 349. To invoke the linker
through the ZDS II Command Processor, see Using the Command Processor – see
page 359.
Linker Commands
This section describes the commands of a linker command file:
•
= – see page 262