Commodore PC - Page 262

190 MS-DOS User's Reference
The Map File
The map file lists the names, load addresses, and lengths of all seg
ments in a program. It also lists the names and load addresses of
any groups in the program, the program start address, and mes
sages about any errors it may have encountered. If the /map
option is used in the link command line, the map file lists the i j
names and load addresses of all public symbols.
Segment information has the general form shown in this example:
Start Stop Length Name Class
00000H 0172CH 0172DH TEXT CODE
01730H 01E19H 006EAH DATA DATA
The Start and Stop columns show the 20-bit addresses (in hex
adecimal) of the first and last byte in each segment. These
addresses are relative to the beginning of the load module, which
is assumed to be address 0000H. The operating system chooses
its own starting address once the program is actually loaded. The
Length column gives the length of the segment in bytes; the Name
column gives the name of the segment; and the Class column
gives the segment's class name. , }
Group information has the following general form:
Origin Group
0000:0 IGROUP
0173:0 DGROUP
In this example, IGROUP is the name of the code (instruction)
group and DGROUP is the name of the data group.
At the end of the listing file, the linker gives you the address of
the program entry point.
If you specify the /map option in the link command line, the
linker adds a public-symbol list to the map file. The symbols are
presented twice: once in alphabetical order, then in the order of
their load addresses. The list has the general form shown in the
following example: t j
Address Publics by Name
0000:1567 BRK
0000:1696 CHMOD
0000:01DB CHKSTK
0000:131C CLEARERR , .
0173:0035 FAC w