Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming cc: C Compiler
Many options (or equivalent forms of these options) are passed to the link editor as the
last phase of compilation. The s, m, and 1 configuration options are passed to specify
memory requirements. The -i, -F, and -p are passed to specify other characteristics of
the final program.
The -D and -1 options may be used several times on the command line. The -D option
must not define the same name twice. These options affect subsequent source files
only.
Memory Models
Table 2-2 defines the number of text and data segments for the different program
memory models. This table also lists the segment register values.
*
Table 2-2. Segments in Program Memory Models
Model Text Data
Small 1* 1*
Middle 1 per module 1
Large 1 per module 1 per module
Huge 1 per module 1 per module
In impure-text small model programs, text and data occupy the same segment. In
pure-text programs, they occupy different segments.
Pointer and Integer Sizes
Table 2-3 defines the sizes (in bits) of text and data pointers, in each program memory
model. The integer (int type) size for compilers that run on the 80286 is 16 bits.
Table 2-3. Pointer and Integer Sizes in Program Memory Models
Model Data Pointer Text Pointer
Small 16 16
Middle 16 32
Large 32 32
Huge 32 32
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