Texas Instruments TMS320C2x, User Manual

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Pragma Directives
5-7 TMS320C2x/C2xx/C5x C Language
5.4 Pragma Directives
Pragma directives tell the compiler’s preprocessor how to treat functions. The
TMS320C2x/C2xx/C5x C compiler supports the following pragmas:
-
CODE_SECTION
-
DATA_SECTION
-
FUNC_EXT_CALLED
Two of these pragmas use the arguments func and symbol . These arguments
must have file scope; that is, you cannot define or declare them inside the body
of a function. You must specify the pragma outside the body of a function, and
it must occur before any declaration, definition, or reference to the
func or sym-
bol argument. If you do not follow these rules, the compiler issues a warning.
5.4.1 The CODE_SECTION Pragma
The CODE_SECTION pragma allocates space for the symbol in a section
named section name . The syntax of the pragma is:
#pragma CODE_SECTION ( symbol , ”section name” );
The CODE_SECTION pragma is useful if you have code objects that you want
to link into an area separate from the .text section.
Example 5 − 1 demonstrates the use of the CODE_SECTION pragma.
Example 5 − 1. Using the CODE_SECTION Pragma
(a) C source file
#pragma CODE_SECTION(fn, ”my_sect”)
int fn(int x)
{
return c;
}
(b) Assembly source file
.file ”CODEN.c”
.sect ”my_sect”
.global _fn
.sym
_fn,_fn,36,2,0
.func 3