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| author | Max Filippov <jcmvbkbc@gmail.com> | 2020-04-25 00:40:25 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2020-04-29 18:34:23 -0700 |
| commit | d548f47df4d2e3d117d504a4c9977982c78a0556 (patch) | |
| tree | e1dee17e4e4ef7333271c7b216105d2e146d9351 /bfd/elf32-xtensa.c | |
| parent | 935f1f4ba35dc018ec6adbc1ba5f0787c84f273b (diff) | |
| download | gdb-d548f47df4d2e3d117d504a4c9977982c78a0556.zip gdb-d548f47df4d2e3d117d504a4c9977982c78a0556.tar.gz gdb-d548f47df4d2e3d117d504a4c9977982c78a0556.tar.bz2 | |
xtensa: fix XTENSA_NDIFF handling for PR ld/25861
Fields marked with XTENSA_NDIFF relocations are not negated, they only
have sign bits removed. Don't negate their values when relaxation is
performed. Don't add sign bits when the value is zero. Report overflow
when the result has negative sign but all significant bits are zero.
2020-04-29 Max Filippov <jcmvbkbc@gmail.com>
bfd/
* elf32-xtensa.c (relax_section): Don't negate diff_value for
XTENSA_NDIFF relocations. Don't add sign bits whe diff_value
equals 0. Report overflow when the result has negative sign but
all significant bits are zero.
ld/
* testsuite/ld-xtensa/relax-diff1.d: New test definition.
* testsuite/ld-xtensa/relax-diff1.s: New test source.
* testsuite/ld-xtensa/relax-ndiff.d: New test definition.
* testsuite/ld-xtensa/relax-ndiff.s: New test source.
* testsuite/ld-xtensa/xtensa.exp: (relax-diff1)
(relax-ndiff): New tests.
Diffstat (limited to 'bfd/elf32-xtensa.c')
| -rw-r--r-- | bfd/elf32-xtensa.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/bfd/elf32-xtensa.c b/bfd/elf32-xtensa.c index fded42d..4327b02 100644 --- a/bfd/elf32-xtensa.c +++ b/bfd/elf32-xtensa.c @@ -9670,37 +9670,44 @@ relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info) switch (r_type) { case R_XTENSA_DIFF8: + diff_mask = 0x7f; diff_value = bfd_get_signed_8 (abfd, &contents[old_source_offset]); break; case R_XTENSA_DIFF16: + diff_mask = 0x7fff; diff_value = bfd_get_signed_16 (abfd, &contents[old_source_offset]); break; case R_XTENSA_DIFF32: + diff_mask = 0x7fffffff; diff_value = bfd_get_signed_32 (abfd, &contents[old_source_offset]); break; case R_XTENSA_PDIFF8: case R_XTENSA_NDIFF8: + diff_mask = 0xff; diff_value = bfd_get_8 (abfd, &contents[old_source_offset]); break; case R_XTENSA_PDIFF16: case R_XTENSA_NDIFF16: + diff_mask = 0xffff; diff_value = bfd_get_16 (abfd, &contents[old_source_offset]); break; case R_XTENSA_PDIFF32: case R_XTENSA_NDIFF32: + diff_mask = 0xffffffff; diff_value = bfd_get_32 (abfd, &contents[old_source_offset]); break; } if (r_type >= R_XTENSA_NDIFF8 - && r_type <= R_XTENSA_NDIFF32) - diff_value = -diff_value; + && r_type <= R_XTENSA_NDIFF32 + && diff_value) + diff_value |= ~diff_mask; new_end_offset = offset_with_removed_text_map (&target_relax_info->action_list, @@ -9710,43 +9717,40 @@ relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info) switch (r_type) { case R_XTENSA_DIFF8: - diff_mask = 0x7f; bfd_put_signed_8 (abfd, diff_value, &contents[old_source_offset]); break; case R_XTENSA_DIFF16: - diff_mask = 0x7fff; bfd_put_signed_16 (abfd, diff_value, &contents[old_source_offset]); break; case R_XTENSA_DIFF32: - diff_mask = 0x7fffffff; bfd_put_signed_32 (abfd, diff_value, &contents[old_source_offset]); break; case R_XTENSA_PDIFF8: case R_XTENSA_NDIFF8: - diff_mask = 0xff; bfd_put_8 (abfd, diff_value, &contents[old_source_offset]); break; case R_XTENSA_PDIFF16: case R_XTENSA_NDIFF16: - diff_mask = 0xffff; bfd_put_16 (abfd, diff_value, &contents[old_source_offset]); break; case R_XTENSA_PDIFF32: case R_XTENSA_NDIFF32: - diff_mask = 0xffffffff; bfd_put_32 (abfd, diff_value, &contents[old_source_offset]); break; } - /* Check for overflow. Sign bits must be all zeroes or all ones */ - if ((diff_value & ~diff_mask) != 0 && - (diff_value & ~diff_mask) != (-1 & ~diff_mask)) + /* Check for overflow. Sign bits must be all zeroes or + all ones. When sign bits are all ones diff_value + may not be zero. */ + if (((diff_value & ~diff_mask) != 0 + && (diff_value & ~diff_mask) != ~diff_mask) + || (diff_value && (bfd_vma) diff_value == ~diff_mask)) { (*link_info->callbacks->reloc_dangerous) (link_info, _("overflow after relaxation"), |