https://sourceware.org/bugzilla/show_bug.cgi?id=34357
SRINATH PARVATHANENI <srinath.parvathaneni at arm dot com> changed:
What |Removed |Added
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CC| |srinath.parvathaneni at arm
dot co
| |m
--- Comment #1 from SRINATH PARVATHANENI <srinath.parvathaneni at arm dot com>
---
I believe the ICE is caused by the `%dtprel(...)` handling in
`gas/config/tc-aarch64.c:s_aarch64_cons()`:
```c
addressT where = frag_now_fix ();
fix_new_exp (frag_now, where, nbytes, &exp, 0,
BFD_RELOC_AARCH64_TLS_DTPREL);
char *dest = frag_more (nbytes);
memset (dest, 0, nbytes);
```
The DTPREL fixup is created before the storage for the `.xword` is reserved.
With some instrumentation, the failing case shows:
```text
where = 3921
size = 8
fr_fix = 3921
loc = 3929 (where + size)
```
Later, in `write_relocs()`, the following check triggers:
```c
if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("internal error: fixup not contained within frag"));
```
Since `loc` (3929) is greater than `fr_fix` (3921), GAS reports:
```text
internal error: fixup not contained within frag
```
Locally, changing the ordering so that the storage is reserved before creating
the fixup appears to avoid the ICE.
I was not able to produce a small standalone reproducer. The failure seems to
depend on the particular DWARF layout: not every `%dtprel` relocation triggers
it. In this case, the DTPREL fixup is created at a frag boundary, which appears
to expose this corner case.
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