asm, __asm
The asm and __asm extended keywords both insert an assembler instruction. However, when compiling C source code, the asm keyword is not available when the option --strict_ansi is used. The __asm keyword is always available.
Note: Not all assembler directives and operators can be inserted using this keyword.
Syntax
asm ("string");
The string can be a valid assembler instruction or an assembler directive, but not a comment. You can write several consecutive inline assembler instructions, for example:

asm ("Label:  nop\n"
     "        b Label");
where \n (new line) separates each new assembler instruction. Note that you can define and use local labels in inline assembler instructions.

For more information about inline assembler, see the ARM® IAR C/C++ Compiler Reference Guide.

__eeprom unsigned char ee_char_buf[CHAR_BSIZE];
unsigned char __eeprom *ee_ch_ptr;  // rigth

int main( void )
{
    volatile char temp;
    
    ee_ch_ptr = ee_char_buf;

    while (1)
    {

        asm("nop\n"
        "label: \n"
            "nop\n"
            "rjmp label");
        
        
        if(temp != 0)
            *FIRST_PARAM=0x10;

        if (temp == 0)
            temp = *FIRST_PARAM;

    }
}