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| author | John Darrington <john@darrington.wattle.id.au> | 2018-06-17 07:04:11 +0200 |
|---|---|---|
| committer | John Darrington <john@darrington.wattle.id.au> | 2018-08-21 19:24:21 +0200 |
| commit | 4e57b456393946cb4f90131b78e162cdec903c8a (patch) | |
| tree | 6b8f7d53baca08f0ca190dda3f41371e038720b4 /bfd/elf32-s12z.c | |
| parent | 4895f384b47628c8c354dccbb0bfab45b8c33984 (diff) | |
| download | gdb-4e57b456393946cb4f90131b78e162cdec903c8a.zip gdb-4e57b456393946cb4f90131b78e162cdec903c8a.tar.gz gdb-4e57b456393946cb4f90131b78e162cdec903c8a.tar.bz2 | |
S12Z: Rename reloc R_S12Z_UKNWN_3 to R_S12Z_EXT18 and implement according to recently inferred information about this reloc.
* bfd/elf32-s12z.c: (opru18_reloc): New function.
* bfd/elf32-s12z.c: (elf_s12z_howto_table): Adjust Howto according to new knowledge.
* include/elf/s12z.h: Rename R_S12Z_UKNWN_3 to R_S12Z_EXT18.
Diffstat (limited to 'bfd/elf32-s12z.c')
| -rw-r--r-- | bfd/elf32-s12z.c | 50 |
1 files changed, 41 insertions, 9 deletions
diff --git a/bfd/elf32-s12z.c b/bfd/elf32-s12z.c index 400555d..cab54c4 100644 --- a/bfd/elf32-s12z.c +++ b/bfd/elf32-s12z.c @@ -34,6 +34,38 @@ static bfd_boolean s12z_info_to_howto_rel (bfd *, arelent *, Elf_Internal_Rela *); static bfd_reloc_status_type +opru18_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol, + void *data, asection *input_section ATTRIBUTE_UNUSED, + bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) +{ + /* This reloc is used for 18 bit General Operand Addressing Postbyte in the + INST opru18 form. This is an 18 bit reloc, but the most significant bit + is shifted one place to the left of where it would normally be. See + Appendix A.4 of the S12Z reference manual. */ + + bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); + bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets); + bfd_vma val = bfd_asymbol_value (symbol); + + /* Keep the wanted bits and discard the rest. */ + result &= 0xFA0000; + + val += symbol->section->output_section->vma; + val += symbol->section->output_offset; + + /* The lowest 17 bits are copied verbatim. */ + result |= val & 0x1FFFF; + + /* The 18th bit is put into the 19th position. */ + result |= (val & 0x020000) << 1; + + bfd_put_24 (abfd, result, (unsigned char *) data + octets); + + return bfd_reloc_ok; +} + + +static bfd_reloc_status_type shift_addend_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED, void *data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED, bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) @@ -136,19 +168,19 @@ static reloc_howto_type elf_s12z_howto_table[] = 0x00ffffff, /* dst_mask */ FALSE), /* pcrel_offset */ - /* The purpose of this reloc is not known */ - HOWTO (R_S12Z_UKNWN_3, /* type */ + /* An 18 bit absolute relocation */ + HOWTO (R_S12Z_EXT18, /* type */ 0, /* rightshift */ - 3, /* size (0 = byte, 1 = short, 2 = long) */ - 0, /* bitsize */ + 5, /* size (0 = byte, 1 = short, 2 = long) */ + 18, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ - complain_overflow_dont,/* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_S12Z_UKNWN_3", /* name */ + complain_overflow_bitfield, /* complain_on_overflow */ + opru18_reloc, /* special_function */ + "R_S12Z_EXT18", /* name */ FALSE, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ + 0x0005ffff, /* src_mask */ + 0x0005ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit absolute relocation */ |