>>>>> "Segher" == Segher Boessenkool <seg...@kernel.crashing.org> writes:

Segher> Yes.  On most architectures you can get multiple machine instructions of
Segher> course (for long calls for example), but on rs6000 (with some ABIs, in
Segher> some circumstances) we generate a nop insn after calls, so that the
Segher> linker has a spot to insert fixup code after calls (typically to restore
Segher> the r2 contents, but it could be anything).

FWIW I sent a gdb patch to work around this bug.  However, in my
examples, I only ever saw a nop following the call instruction -- so I
had gdb check for this.

Patch is here:

https://sourceware.org/pipermail/gdb-patches/2023-March/197951.html

... but I suppose I should change it to drop the nop check?

It would of course be better not to have to have gdb work around this
problem.

Tom

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