From: "Maciej W. Rozycki" <macro@orcam.me.uk>
To: Andrew Burgess <aburgess@redhat.com>
Cc: binutils@sourceware.org
Subject: Re: [PATCH 1/2] opcodes/mips: use .word/.short for undefined instructions
Date: Fri, 6 Jan 2023 15:58:08 +0000 (GMT) [thread overview]
Message-ID: <alpine.DEB.2.21.2301061545130.54090@angie.orcam.me.uk> (raw)
In-Reply-To: <e53fbf5025e59fe6a3481b9c1fe37e4f6cf6e03d.1667483581.git.aburgess@redhat.com>
Hi Andrew,
In the course of reviewing outstanding upstream mailing list traffic I
came across this change of yours.
On Thu, 3 Nov 2022, Andrew Burgess via Binutils wrote:
> diff --git a/opcodes/mips-dis.c b/opcodes/mips-dis.c
> index faeebccfc3b..1d9875f2bb0 100644
> --- a/opcodes/mips-dis.c
> +++ b/opcodes/mips-dis.c
> @@ -2515,7 +2515,10 @@ print_insn_micromips (bfd_vma memaddr, struct disassemble_info *info)
> }
> }
>
> - infprintf (is, "0x%x", insn);
> + if (length == 2)
> + infprintf (is, ".short\t0x%x", insn);
> + else
> + infprintf (is, ".word\t0x%x", insn);
FYI, I find this questionable as `.word' (at least with the MIPS target)
implies natural alignment while 32-bit microMIPS encodings, valid or not,
are not. Also, given the endianness peculiarity (analogous to the MIPS16
extended encodings), I think this needs to be ".short\t0x%x, 0x%x" really,
with the instruction word split into halfwords for any reasonable meaning.
This is already reflected in the raw hex dump of instruction streams; the
numbers printed need to match it.
With the naked number previously used this obviously didn't matter as it
stood out without any attempt to pretend to have a meaning. This is also
the reason why I chose to keep it as it used to be since forever.
FWIW,
Maciej
next prev parent reply other threads:[~2023-01-06 15:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-03 13:58 [PATCH 0/2] MIPS disassembler styling Andrew Burgess
2022-11-03 13:58 ` [PATCH 1/2] opcodes/mips: use .word/.short for undefined instructions Andrew Burgess
2023-01-06 15:58 ` Maciej W. Rozycki [this message]
2023-01-06 16:40 ` Andrew Burgess
2023-01-08 16:05 ` Maciej W. Rozycki
2023-01-17 10:28 ` Andrew Burgess
2023-01-27 11:57 ` Maciej W. Rozycki
2023-01-30 9:34 ` Andrew Burgess
2023-02-01 10:40 ` Maciej W. Rozycki
2023-02-01 15:32 ` Andrew Burgess
2023-02-02 9:48 ` Maciej W. Rozycki
2023-02-03 9:31 ` Andrew Burgess
2023-02-13 12:07 ` Andrew Burgess
2023-02-14 4:43 ` Maciej W. Rozycki
2022-11-03 13:58 ` [PATCH 2/2] libopcodes/mips: add support for disassembler styling Andrew Burgess
2022-11-28 17:15 ` [PATCH 0/2] MIPS " Andrew Burgess
2022-11-30 16:50 ` Nick Clifton
2022-12-05 10:08 ` Andrew Burgess
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