CODE_SECTION pragma

安_然

CODE_SECTION pragma [复制链接]

The CODE_SECTION pragma allocates space for the func in a section named 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.
The syntax of the pragma in C is:

#pragma CODE_SECTION (func, "section name")

The syntax of the pragma in C++ is:

#pragma CODE_SECTION ("section name")

The following example demonstrates the use of the CODE_SECTION pragma.

Using the CODE_SECTION Pragma

a)  C source file
char bufferA[80];
char bufferB[80];

#pragma CODE_SECTION(funcA, "codeA")

char funcA(int i);
char funcB(int i);

void main()
{
 char c;
 c = funcA(1);
 c = funcB(2);
}

char funcA (int i)
{
 return bufferA;
}

char funcB (int j)
{
 return bufferB[j];
}
b)  Assembly source file

.sect   ".text"
        .global _main

;***************************************************************
;* FNAME: _main                         FR SIZE:   2           *
;*                                                             *
;* FUNCTION ENVIRONMENT                                        *
;*                                                             *
;* FUNCTION PROPERTIES                                         *
;*                            0 Parameter,  1 Auto,  0 SOE     *
;***************************************************************

_main:

        ADDB      SP,#2
        MOVB      AL,#1                 ; |12|
        LCR       #_funcA               ; |12|
        ; call occurs [#_funcA] ; |12|
        MOV       *-SP[1],AL            ; |12|
        MOVB      AL,#1                 ; |13|
        LCR       #_funcB               ; |13|
        ; call occurs [#_funcB] ; |13|
        MOV       *-SP[1],AL            ; |13|
        SUBB      SP,#2
        LRETR
       ; return occurs

.sect   "codeA"
        .global _funcA
;***************************************************************
;* FNAME: _funcA                        FR SIZE:   1           *
;*                                                             *
;* FUNCTION ENVIRONMENT                                        *
;*                                                             *
;* FUNCTION PROPERTIES                                         *
;*                            0 Parameter,  1 Auto,  0 SOE     *
;***************************************************************

_funcA:
        ADDB      SP,#1
        MOV       *-SP[1],AL            ; |17|
        MOVZ      AR6,*-SP[1]           ; |18|
        ADD       AR6,#_bufferA         ; |18|
        SUBB      SP,#1                 ; |18|
        MOV       AL,*+XAR6[0]          ; |18|
        LRETR
        ;return occurs

         .sect   ".text"
         .global _funcB

;***************************************************************
;* FNAME: _funcB                        FR SIZE:   1           *
;*                                                             *
;* FUNCTION ENVIRONMENT                                        *
;*                                                             *
;* FUNCTION PROPERTIES                                         *
;*                            0 Parameter,  1 Auto,  0 SOE     *
;***************************************************************

_funcB:
        ADDB      SP,#1
        MOV       *-SP[1],AL            ; |22|
        MOVZ      AR6,*-SP[1]           ; |23|
        ADD       AR6,#_bufferB         ; |23|
        SUBB      SP,#1                 ; |23|
        MOV       AL,*+XAR6[0]          ; |23|
        LRETR
        ;return occurs