Zilog Z8F0130 - Manual (Page 370)

Using the Linker/Locator UM013037-1212
346
Zilog Developer Studio II – Z8 Encore!
User Manual
A group is a collection of logical address spaces. They are typically used for conve-
nience of locating a set of address spaces.
•
Segments
Each address space consists of various segments. Segments are named logical parti-
tions 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 seg-
ments can be randomly allocated by the linker; absolute segments are assigned a phys-
ical address within its address space. See the
Segments section on page 279 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 26).
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 of the
Project Settings dialog box (see the Linker: Objects and Libraries Page sec-
tion on page 98).The linker uses the linker command file to control how these object mod-
ules 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 95). You can add additional linker commands by selecting the
Additional Directives checkbox and clicking Edit (see the Additional Directives section
on page 96). If you want to override the automatically generated linker command file,
select the
Use Existing button (see the Use Existing section on page 97).
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 the
Appendix C. Running ZDS II from the Command Line section on page 479.
To invoke the linker through the ZDS II Command Processor, see Appendix D. Using the
Command Processor on page 489.