microcontroller - ELF Relocation Types on MSP430 -

i have take relocatable elf file , fix addresses in msp430-f5529 red hat compiler (not ti). however, don't understand how relocations have made don't notation used.

here types , details.

let's take 1 example.

• name : r_msp430x_abs20_adr_dst
• signedness : unsigned
• containersize : 32
• field : [0,4]+[16,16]

and following generated asm :

0c60 0000 : mova r12, &0x00000

if search mova opcode in wikipedia see structure of opcode follows:

offset : [7] [6] [5] [4] [3] [2] [1] [0]

hex value : [0] [dst] [6] [src] [src] [src] [src] [src]

we know dst c stands r12 , last 20 bits address replaced (last 4 bits plus 16 bits - last 4 0s-).

i know need understand how interpret [0,4]+[16,16]. looks [0,4] references last 4 bits on first 2 bytes (0060 0000), how work ? , how should read [16,16] ?

here quote of explanation on pdf in case understands.

the field specified using tuple [cs, o, fs], cs container size, o starting offset lsb of container lsb of field, , fs size of field. values in bits. notation [x,y]+[z,w] indicates relocation occupies discontiguous bit ranges, should concatenated form field.

thanks.

your "offset" values wrong.

"containersize: 32" means have view instruction single, little-endian, 32-bit value. 32-bit value, written 00000c60. 4 bytes are, in order, 60, 0c, 00, , 00. bits follows:

31302928272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0  a a a a a a a a 0 0 0 0 s s s s 0 1 1 0 a a