Puzzle:Is addend ok when handling relocations in linking mips32-elf
Mon Mar 9 11:11:00 GMT 2009
I'm studying mips-elf relocation process in gnu ld and puzzled about
In mips-elf relocation function for ld which is
the addend is calculated some kind like:
STEP 1 : addend = mips_elf_obtain_contents (howto, rel, input_bfd,
STEP 2 : addend &= howto->src_mask;
STEP 3 : addend <<= howto->rightshift;
STEP 4 : mips_elf_calculate_relocation (output_bfd, input_bfd,
input_section, info, rel,
addend, howto, local_syms,
It seems that above code doesn't take howto->bitpos into consider.
For now most howto structs in elf32-mips.c set howto->bitpos to 0,
except R_MIPS_SHIFT5 and R_MIPS_SHIFT6.
I searched source codes and found that R_MIPS_SHIFT5 and R_MIPS_SHIFT6
are not used currently.
here comes the problem, If i have a howto structure with nonzero bitpos,
I think addend will be wrong and should be right shift with howto->bitpos.
Right or I just missed something important?
Thanks and any tips will be appreciated.
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