asm.s

this is the ADD routine for the prime field and large numbers for ECC or RSA algorithms. with IAR v

        NAME    main
        
        PUBLIC  __iar_program_start
        
        SECTION .intvec : CODE (2)
        CODE32
        
__iar_program_start
        B       main

        PUBLIC  __iar_zero_init
        PUBLIC  __iar_copy_init
        
        EXTERN  acl_p_mod_add32
        EXTERN  acl_p_mod_add
        SECTION .text : CODE (2)
        CODE32
        
#define         dest    r0      
#define         src1    r1      
#define         src2    r2      
#define         emm     r3      
#define         len     r4      
#define         temp    r5      

main   
        ldr     dest,= result_buf
        ldr     src1,= source1_buf
        ldr     src2,= source2_buf
        ldr     emm,= mode_buf
        ldr     len,= 3

        ldr     temp,= 12345
        str      temp, [src1]
     
        ldr     temp,= 67890
        str      temp, [src2]

        ldr     temp,= 13
        str      temp, [emm]

        BL      acl_p_mod_add

        B       main

__iar_zero_init:
__iar_copy_init:

        SECTION .data : DATA (2)
        DATA

result_buf    DS32    16
source1_buf   DS32    16
source2_buf   DS32    16
mode_buf      DS32    16
        
        END