This section explains using the following extended specifications.

#pragma section [<section type>] [D<new section name>]

<section type>: { P | C | D | B }

This extension changes the section name to be output by the compiler.

When both a section type and a new section name are specified, the section names for all functions written after the #pragma declaration are changed if the specified section type is P. If the section type is C, D, or B, the names of all sections defined after the #pragma declaration are changed.

When only a new section name is specified, the section names for the program, constant, initialized data, and uninitialized data areas after the #pragma declaration are changed. In this case, the default section name postfixed with the string specified by <new section name> is used as the new section name.

When neither a section type nor a new section name is specified, the section names for the program, constant, initialized data, and uninitialized data areas after the #pragma declaration are restored to the default section names.

The default section name for each section type is determined by the section option when specified. If the default section name is not specified by the section option, the section type name is used instead.

[Earlier than V3.02.00] #pragma section must be specified outside function definitions.

[V3.02.00 or later] #pragma section can be specified within function definitions. The opening and closing parentheses of a function do not affect the valid range of #pragma.

[V3.02.00 or later] #pragma section has effect on the name of the section containing static variables within the function, static data members, and their initial values. However, there is no effect on the names of the following sections:

#pragma section B Ba

int i; 	// Allocated to the Ba section

void func(void)

{

(omitted)

}

#pragma section B Bb

int j;	// Allocated to the Bb section

void sub(void)

{

(omitted)

}

#pragma section abc

int a; 	// Allocated to the Babc section

const int c=1; 	// Allocated to the Cabc section

void f(void)	// Allocated to the Pabc section

{

    a=c;

}

#pragma section

int b;	// Allocated to the B section

void g(void)	// Allocated to the P section

{

    b=c;

}

/*

** Class member declaration

*/

class A {

  private:

    // No initial value specified

#pragma section DATA

    static int data_;

#pragma section

    // Initial value specified

#pragma section TABLE

    static int table_[2];

#pragma section

};

/*

** Class member definition

*/

// No initial value specified

#pragma  section  DATA

int A::data_;

#pragma section

// Initial value specified

#pragma section TABLE

int A::table_[2] = { 0,  1 };

#pragma section

oid test1(void) {

#pragma section B B1

  static int b1;  // B1

#pragma section B B2

  static int b2;  // B2

}

// The valid range is not affected by the parentheses of the function definition.

int b3;  // B2

void test2(void) {

  static int b4;  // B2

#pragma section

  static int b5;  // B

}

The section name of the following items cannot be changed by this extension. The section option needs to be used.

(1) String literal and initializers for use in the dynamic initialization of aggregates
(2) Branch table of switch statement

Up to 2045 sections can be specified by #pragma section in one file.

When specifying the section for static class member variables, be sure to specify #pragma section for both the class member declaration and definition.

/*

 ** Class member declaration

 */

	class A

	{

		private:

		// No initial value specified

		#pragma section DATA

static int data_;

#pragma section

// Initial value specified

#pragma section TABLE

static int table_[2];

#pragma section

	};

	/*

	** Class member definition 

	*/

	// No initial value specified

	#pragma section DATA

	int A::data_;

	#pragma section

	// Initial value specified

	#pragma section TABLE

	int A::table_[2]={0, 1};

	#pragma section

#pragma stacksize { si=<constant> | su=<constant> }

When si=<constant> is specified, a data section is created to be used as the stack of size <constant> with section name SI.

When su=<constant> is specified, a data section is created to be used as the stack of size <constant> with section name SU.

C source description:

#pragma stacksize si=100

#pragma stacksize su=200

Example of expanded code:

.SECTION    SI,DATA,ALIGN=4 

.BLKB       100

.SECTION    SU,DATA,ALIGN=4 

.BLKB       200

si and su can each be specified only once in a file.

<constant> must always be specified as a multiple of four.

A value from 4 to 2147483644(0x7ffffffc) is specifiable for <constant>.

#pragma interrupt [(]<function name>[(<interrupt specification>[,...])][,...][)]

This extension declares an interrupt function.

A global function or a static function member can be specified for the function name.

Table 4.8 lists the interrupt specifications.

An interrupt function declared by #pragma interrupt guarantees register values before and after processing (all registers used by the function are pushed onto and popped from the stack when entering and exiting the function). The RTE instruction directs execution to return from the function in most cases.

An interrupt function with no interrupt specifications is processed as a simple interrupt function.

When use of the vector table is specified (vect=), the interrupt function address is stored in the specified vector table number location in the C$VECT section.

[V3.00.00 or later] When the -split_vect option is specified in the optimizing linkage editor, the C$VECT section is split by vector table number and each section has the name of "C$VECT<vector table number>".

When use of fast interrupt processing is specified (fint), the RTFI instruction is used to return from the function. When the fint_register option is also specified, the registers specified through the option are used by the interrupt function without being saved or restored.

When a limitation on registers in interrupt function is specified (save), the registers that can be used in the interrupt function are limited to R1 to R5 and R14 to R15. R6 to R13 are not used and the instructions for saving and restoring them are not generated.

When enable is specified, the I flag in PSW is set to 1 at the beginning of the function to enable nested interrupts.

When Accumulator saving (acc) is specified, if another function is called from a function specified with #pragma interrupt or the function uses an instruction that modifies the ACC, an instruction to save and restore the ACC is generated. When RXv1 is selected as ISA*1, the ACC is saved and restored. When a value other than RXv1 is selected as ISA*1, ACC0 and ACC1 are saved and restored.

When Accumulator non-saving is specified (no_acc), an instruction to save and restore the ACC is not generated.

If neither acc nor no_acc is specified, the result depends on the setting of the compiler option -save_acc.

[V3.01.00 or later] When bank = <bank number> is specified, the CC-RX enables the use of the register bank save function (for which the SAVE and RSTR instructions are provided) in cases where it is considered necessary. The destination for saving data is the save register bank with the number specified in <bank number>. Refer to the User's Manual: Hardware for the target MCU and specify a bank number that is actually available.

When this facility is enabled, the values of ACC0 and ACC1 are also saved and restored even if the -save_acc option is not specified or no_acc (not saving accumulator values) is specified. Specifying bank = <bank number> when RXv1 or RXv2 is selected as ISA*1 will lead to an error. When you specify bank = <bank number>, also specify the assembler option -bank. If you are using an integrated development environment from Renesas, -bank is specified automatically upon selection of an MCU that has save register banks.

[V3.05.00 or later] When tfu (saving output of the trigonometric function unit) is specified, if another function is called from a function specified with #pragma interrupt or the function uses the trigonometric function unit, instructions to save and restore the output (DTSR0, DTSR1) of the trigonometric function unit are generated.

When no_tfu (not saving output of the trigonometric function unit) is specified, instructions to save and restore output of the trigonometric function unit are not generated.

Interrupt specifications tfu and no_tfu can be specified only when tfu_version=v2 is specified. If neither tfu nor no_tfu is specified, the result depends on the setting of the -nosave_tfu compile option.

The function must return only void data. No return value can be specified for the return statement. If attempted, an error will be output.

#pragma interrupt (f1, f2)

void f1(){...}	// Correct declaration.

int f2(){...}	// An error will be output 

	// because the return value is not 

	// void data.

C source description:

#pragma interrupt func

void func(){ .... }

Output code:

_func:

	PUSHM	 R1-R3	; Saves the registers used in the function.

	....

	(R1, R2, and R3 are used in the function)

	....

	POPM 	R1-R3	; Restores the registers saved at the entry.

	RTE

C source description:

#pragma interrupt func

void func(){

  ...

  sub();

  ...

}

Output code:

_func:

    PUSHM R14-R15

    PUSHM R1-R5

    ...

    BSR _sub

    ...

    POPM R1-R5

    POPM R14-R15

    RTE

C source description: Compiles with the fint_register=2 option specified

#pragma interrupt func1(fint) 

void func1(){ a=1; }    //  Interrupt function 

void func2(){ a=2; }    //  General function

Output code:

_func1:

    PUSHM R1-R3 ;  Saves the registers used in the function.

    ...         ; (Note that R12 and R13 are not saved.) 

    ...

    (R1, R2, R3, R12, and R13 are used in the function.) 

    ...

    POPM R1-R3  ;  Restores the registers saved at the entry.

    RTFI

_func2: 

    ...         ; In the functions without #pragma interrupt fint

    ...         ; specification, do not use R12 and R13.

    RTE

C source description:

void func5(void);

#pragma interrupt accsaved_ih(acc)      /* Specifies acc */

void accsaved_ih(void)

{

     func5();

}

Output code:

_accsaved_ih:

     PUSHM R14-R15

     PUSHM R1-R5

     MVFACMI R4

     SHLL #10H, R4

     MVFACHI R5

     PUSHM R4-R5

     BSR _func5

     POPM R4-R5

     MVTACLO R4

     MVTACHI R5

     POPM R1-R5

     POPM R14-R15

     RTE

[Remarks]

Due to the specifications of the RX instruction set, if rxv1 is specified for ISA*1, only the upper 48 bits of ACC can be saved and restored with the acc flag. The lower 16 bits of ACC are not saved or restored.

Each interrupt specification can be specified only with alphabetical lowercase letters. When specified with uppercase letters, an error will occur.

When vect is used as an interrupt specification, the address of empty vectors for which there is no specification is 0. You can specify a desired address value or symbol for an address with the optimizing linkage editor. For details, refer to the descriptions on the VECT and VECTN options.

Parameters are not definable for #pragma interrupt functions. Although defining parameters for such functions does not lead to an error, values read out from the parameters are undefined.

Purpose of acc and no_acc:
acc and no_acc take into account the following purposes:

C source description:

#pragma interrupt func(bank=3)      /* Specifies "bank=3" */

void func(void)

{

     ...

}

Output code:

_func:

     SAVE #03H ;  Instruction for saving values in save register bank 3

     ...

     RSTR #03H ;  Instruction for restoring values from save register bank 3

     RTE

C source description:

#pragma interrupt func(vect=64, bank=4) /* Specifies "vect=64" and "bank=4" */

void func(void)

{

     ...

}

Output code:

_func:

     .RVECTOR      64,_func ;  Vector table number registration

     SAVE #04H ;  Instruction for saving values in save register bank 4

     ...

     RSTR #04H ;  Instruction for restoring values from save register bank 4

     RTE

#pragma inline [(]<function name>[,...][)

#pragma noinline [(]<function name>[,...][)]

#pragma inline declares a function for which inline expansion is performed.

Even when the noinline option is specified, inline expansion is done for the function specified by #pragma inline.

#pragma noinline declares a function for which the inline option effect is canceled.

A global function or a static function member can be specified as a function name.

When inline expansion is performed for a function specified by #pragma inline or a function with the inline function specifier (C++ and C (C99), the body of the function is expanded where the function is called.

#pragma inline(func)

static int func (int a, int b)

{

    return (a+b)/2;

}

int x;

main()

{

    x=func(10,20);

}

Inline expansion image:

int x;

main()

{

    int func_result;

    {

        int a_1=10, b_1=20;

        func_result=(a_1+b_1)/2;

    }

    x=func_result;

}

Inline expansion will not be applied in the following functions even when #pragma inline is specified.

#pragma inline does not guarantee inline expansion; inline expansion might not be applied due to restrictions on increasing compilation time or memory size. If inline expansion is canceled, try specifying the noscope option; inline expansion may be applied in some cases.

Specify #pragma inline before defining a function.

An external definition is generated for a function specified by #pragma inline.

When #pragma inline is specified for a static function, the function definition is deleted after inline expansion.

The C++ compiler does not create external definitions for inline-specified functions.

The C (C99) does not create external definitions for inline-specified functions unless they include extern declarations.

#pragma inline_asm[(]<function name>[,...][)]

This extension declares an assembly-language function for which inline expansion is performed.

The general function calling rules are also applied to the calls of assembly-language inline functions.

#pragma inline_asm func

static int func(int a, int b){

	ADD	 R2,R1	; Assembly-language description

}

main(int *p){

*p = func(10,20);

}

Output code:

_main:

   PUSH.L R6

   MOV.L R1, R6

   MOV.L #20, R2

   MOV.L #10, R1

   ADD  R2,R1; Assembly-language description

   MOV.L R1, [R6]

   MOV.L #0, R1

   RTSD #04H, R6-R6

Specify #pragma inline_asm before defining a function.

An external definition is generated for a function which is not a static function but for which #pragma inline_asm is specified.

When the registers whose values are saved and restored at the entry and exit of a function (see Table 9.1 Rules to Use Registers) are used in an assembly-language inline function, these registers must be saved and restored at the start and end of the function.

[Remarks]

#pragma entry[(]<function name>[)]

This specifies that the function specified as <function name> is handled as an entry function.

The entry function is created without any code to save and restore the contents of registers.

When #pragma stacksize is declared, the code that makes the initial setting of the stack pointer will be output at the beginning of the function.

When the base option is specified, the base register specified by the option is set up.

#pragma stacksize su=100

#pragma entry INIT

void INIT() {

:

}

Output code:

.SECTION    SU,DATA,ALIGN=4

.BLKB       100

.SECTION    P,CODE

_INIT:

MVTC        (TOPOF SU + SIZEOF SU),USP

MOV.L       #__ROM_TOP,R13

Be sure to specify #pragma entry before declaring a function.

Do not specify more than one entry function in a load module.

#pragma bit_order [{left | right}]

This extension switches the order of bit field assignment.

When left is specified, bit field members are assigned from the upper-bit side. When right is specified, members are assigned from the lower-bit side.

The default is right.

If left or right is omitted, the order is determined by the option specification.

#pragma pack

#pragma unpack

#pragma packoption

This changes the alignment values for members of the structure type, union type, and class type declared after the location where #pragma is specified in the source program. If neither #pragma pack nor #pragma unpack is specified or if a structure type, union type, or class type is declared after the location where #pragma packoption is specified, the alignment value for members is determined by the pack option. Table 4.9 shows the #pragma specification and the corresponding alignment values.

#pragma pack

struct S1 {

   char a;	/* Byte offset = 0	*/

   int b;	/* Byte offset = 1	*/

   char c;	/* Byte offset = 5	*/

} ST1;	/* Total size: 6 bytes	*/

#pragma unpack

struct S2 {

   char a;	/* Byte offset = 0	*/

	/* 3-byte empty area	*/

   int b;	/* Byte offset = 4	*/

   char c;	/* Byte offset = 8	*/

	/* 3-byte empty area	*/

} ST2;	/* Total size: 12 bytes	*/

The boundary alignment value for structure and class members can also be specified by the pack option. When both the option and #pragma extension specifier are specified together, the #pragma specification takes priority.

#pragma address [(]<variable name>=<absolute address>[,...][)]

This extension allocates the specified variable to the specified address. The compiler assigns a section for each specified variable, and the variable is allocated to the specified absolute address during linkage. If variables are specified for contiguous addresses, these variables are assigned to a single section.

#pragma address X=0x7f00

int X;

main(){

    X=0;

}

Output code:

_main:

	MOV.L       #0,R5

	MOV.L       #7F00H,R14	; 

	MOV.L       R5,[R14]

	RTS

	.SECTION    $ADDR_B_7F00

	.ORG        7F00H

	.glb        _X

_X:		; static: X

	.blkl       1

[Remarks]

#pragma endian [{big | little}]

This extension specifies the endian for the area that stores static objects.

The specification of this extension is applied from the line containing #pragma endian to the end of the file or up to the line immediately before the line containing the next #pragma endian.

big specifies big endian. When the endian=little option is specified, data is assigned to the section with the section name postfixed with _B.

little specifies little endian. When the endian=big option is specified, data is assigned to the section with the section name postfixed with _L.

When big or little is omitted, endian is determined by the option specification.

C source description:

#pragma endian big

int A=100;	/* D_B section */

#pragma endian

int B=200;	/* D section */

Output code:

   .glb   _A

   .glb   _B

   .SECTION   D,ROMDATA,ALIGN=4

_B:

   .lword   200

   .SECTION  D_B,ROMDATA,ALIGN=4

   .ENDIAN  BIG

_A:

   .lword   100

If areas of the long long type, double type (when the dbl_size=8 option is specified), and long double type (when the dbl_size=8 option is specified) are included in objects to which #pragma endian (differed from the endian option) is applied, do not make indirect accesses to these areas using addresses or pointers. In such a case, correct operation will not be guaranteed. If a code that acquires an address in such an area is included, a warning message is displayed.

If bit fields of the long long type are included in objects to which #pragma endian (differed from the endian option) is applied, do not make writes to these areas. In such a case, correct operation will not be guaranteed.

The endian of the following items cannot be changed by this extension. The endian option needs to be used.

(1) String literal and initializers for use in the dynamic initialization of aggregates
(2) Branch table of switch statement
(3) Objects declared as external references (objects declared through extern without initialization expression)

(4) Objects specified as #pragma address

#pragma instalign4 [(]<function name>[(<branch destination type>)][,...][)]

#pragma instalign8 [(]<function name>[(<branch destination type>)][,...][)]

#pragma noinstalign [(]<function name>[,...][)]

Specifies the function in which instructions at branch destinations are aligned for execution.

Instruction allocation addresses in the specified function are adjusted to be aligned to 4-byte boundaries when #pragma instalign4 is specified or to 8-byte boundaries when #pragma instalign8 is specified.

In the function specified with #pragma noinstalign, alignment of allocation addresses is not adjusted.

The branch destination type should be selected from the following*:

No specification: Head of function and case and default labels of switch statement

inmostloop: Head of each inmost loop, head of function, and case and default labels of switch statement

loop: Head of each loop, head of function, and case and default labels of switch statement

Except that each #pragma extension specification is valid only in the specified function, these specifiers work in the same way as the instalign4, instalign8, and noinstalign options. When both the options and #pragma extension specifiers are specified together, the #pragma specifications take priority.
In the code section that contains a function specified with instalign4 or instalign8, the alignment value is changed to 4 (instalign4 is specified) or 8 (instalign8 is specified). If a single code section contains both a function specified with instalign4 and that specified with instalign8, the alignment value in the code section is set to 8.
The other detailed functions of these #pragma extension specifiers are the same as those of the instalign4, instalign8, and noinstalign options; refer to the description of each option.

#pragma stack_protector [(] function name [(num=<integer value>)] [,...] [)]

#pragma no_stack_protector [(] function name [,...] [)]

Generates a code for detection of stack smashing at the entry and the end of a function. A code for detection of stack smashing consists of instructions executing the three processes shown below.

(1) A 4-byte area is allocated just before (in the direction towards address 0xFFFFFFFF) the local variable area at the entry to a function, and the value specified by <number> is stored in the allocated area.

(2) At the end of the function, whether the 4-byte area in which <number> was stored has been rewritten is checked.

(3) If the 4-byte area has been rewritten in (2), the __stack_chk_fail function is called as the stack has been smashed.

A decimal number from 0 to 4294967295 should be specified in <number>. If the specification of <number> is omitted, the compiler automatically selects the number.

The __stack_chk_fail function needs to be defined by the user. It should contain postprocesses for the detected stack smashing.

Note the following items when defining the __stack_chk_fail function.

A code for detection of stack smashing is not generated for a function for which #pragma no_stack_protector has been specified regardless of the -stack_protector option and -stack_protector_all option.

If these options are used simultaneously with #pragma stack_protector, the -stack_protector option, or the -stack_protector_all option, the specification by #pragma becomes valid.

An error will occur when #pragma stack_protector and #pragma no_stack_protector are specified simultaneously for the same function within a single translation unit.

When the function specified by #pragma stack_protector is specified as any one of the following functions, an error message is output.

#pragma inline

#pragma inline_asm

#pragma entry