From: Andreas Schwab <schwab@linux-m68k.org>
To: opensbi@lists.infradead.org
Subject: [PATCH] lib: sbi_illegal_insn: Emulate 'MZ'/c.li s4,-13 instruction
Date: Wed, 08 Nov 2023 22:55:18 +0100 [thread overview]
Message-ID: <874jhvc3ll.fsf@igel.home> (raw)
In-Reply-To: <20231108191310.49950-1-bjorn@kernel.org> ("Björn Töpel"'s message of "Wed, 8 Nov 2023 20:13:10 +0100")
On Nov 08 2023, Bj?rn T?pel wrote:
> +static int compressed_insn(ulong insn, struct sbi_trap_regs *regs)
> +{
> + /* Only handle 'MZ'/c.li s4,-13/0x5a3d */
> + if (!misa_extension('C') && (insn & 0xffff) == 0x5a4d) {
> + regs->s4 = -13;
> + regs->mepc += 4;
By skipping 4 bytes execution will resume in the middle of the next insn
(the jump around the header).
--
Andreas Schwab, schwab at linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
next prev parent reply other threads:[~2023-11-08 21:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-08 19:13 [PATCH] lib: sbi_illegal_insn: Emulate 'MZ'/c.li s4,-13 instruction Björn Töpel
2023-11-08 21:55 ` Andreas Schwab [this message]
2023-11-09 0:02 ` Björn Töpel
2023-11-09 0:11 ` Jessica Clarke
2023-11-09 0:22 ` Björn Töpel
2023-11-09 4:04 ` Xiang W
2023-11-09 6:24 ` Jessica Clarke
2023-11-09 6:55 ` Xiang W
2023-11-09 7:00 ` Jessica Clarke
2023-11-09 7:10 ` Xiang W
2023-11-09 7:19 ` Jessica Clarke
2023-11-09 7:54 ` Inochi Amaoto
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