Hi,
[Ideally this is the binutils part of it. But I am continuing anyway hoping to
get some immediate help in AVR target.]
I am trying to understand relocation types in AVR. To start with, can someone
illustrate how R_AVR_16 works in the following case?
long i;
int main()
{
return i++;
}
The corresponding HOWTO macro in bfd/elf32-avr.c is defined as:
/* A 16 bit absolute relocation. */
HOWTO (R_AVR_16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_AVR_16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
As I see it, since the address is 16-bit, 'size' is 1. How do we arrive at
'rightshift' and 'bitsize' entries? And how assembler knows to emit R_AVR_16
type? I would really appreciate any explanation on this...
As additional information -
When I just compile (no linking done) and dump the relocation entries,
following output shows up:
RELOCATION RECORDS FOR [.text]:
OFFSET TYPE VALUE
0000000a R_AVR_16 i
0000000e R_AVR_16 i+0x00000001
00000012 R_AVR_16 i+0x00000002
00000016 R_AVR_16 i+0x00000003
00000022 R_AVR_16 i
00000026 R_AVR_16 i+0x00000001
0000002a R_AVR_16 i+0x00000002
0000002e R_AVR_16 i+0x00000003
(I understand that relocations are applied at given offsets)
Thanks
Anitha
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