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From:   Andreas Schwab <schwab@linux-m68k.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Petr Mladek <pmladek@suse.com>,
        Joe Lawrence <joe.lawrence@redhat.com>,
        <live-patching@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        <linux-modules@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        David Laight <David.Laight@aculab.com>,
        linux-m68k <linux-m68k@lists.linux-m68k.org>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>
Subject: Re: [PATCH v9] kallsyms: Add self-test facility
References: <20221115083349.1662-1-thunder.leizhen@huawei.com>
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        <CAMuHMdW=KXfYc3Rqz6LizJcDxRX3BzUFTPpdTpDB68sw+QPJ=A@mail.gmail.com>
        <b00bcc04-0633-bac9-76ab-572f9470901c@huawei.com>
        <CAMuHMdWPSeieR-sGuozd3kWGjVw85EV40irqM9aErXufifzFNA@mail.gmail.com>
        <49070ac3-02bb-a3b3-b929-ede07e3b2c95@huawei.com>
        <e81710a9-2c45-0724-ec5f-727977202858@huawei.com>
        <CAMuHMdWAAQNJd21fhodDONb40LFMae3V_517iT22FykCqG90Og@mail.gmail.com>
        <4aaede14-8bd3-6071-f17b-7efcb5f0de42@huawei.com>
        <66ec4021-b633-09ba-73ee-b24cdb3fa25a@huawei.com>
Date:   Fri, 16 Dec 2022 12:57:03 +0100
In-Reply-To: <66ec4021-b633-09ba-73ee-b24cdb3fa25a@huawei.com> (Leizhen's
        message of "Fri, 16 Dec 2022 17:36:30 +0800")
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On Dez 16 2022, Leizhen (ThunderTown) wrote:

> It seems that the problem is still strcmp(). After I commented strcmp() in
> arch/m68k/include/asm/string.h, and force it to use the one in lib/string.c,
> it works well.

Does that help?

diff --git a/arch/m68k/include/asm/string.h b/arch/m68k/include/asm/string.h
index f759d944c449..cdafd67774e0 100644
--- a/arch/m68k/include/asm/string.h
+++ b/arch/m68k/include/asm/string.h
@@ -42,18 +42,19 @@ static inline char *strncpy(char *dest, const char *src, size_t n)
 #define __HAVE_ARCH_STRCMP
 static inline int strcmp(const char *cs, const char *ct)
 {
-	char res;
+	int res = 0, tmp = 0;
 
 	asm ("\n"
 		"1:	move.b	(%0)+,%2\n"	/* get *cs */
-		"	cmp.b	(%1)+,%2\n"	/* compare a byte */
+		"	move.b	(%1)+,%3\n"	/* get *ct */
+		"	cmp.b	%3,%2\n"	/* compare a byte */
 		"	jne	2f\n"		/* not equal, break out */
 		"	tst.b	%2\n"		/* at end of cs? */
 		"	jne	1b\n"		/* no, keep going */
 		"	jra	3f\n"		/* strings are equal */
-		"2:	sub.b	-(%1),%2\n"	/* *cs - *ct */
+		"2:	sub.l	%3,%2\n"	/* *cs - *ct */
 		"3:"
-		: "+a" (cs), "+a" (ct), "=d" (res));
+		: "+a" (cs), "+a" (ct), "+d" (res), "+d" (tmp));
 	return res;
 }
 #endif /* CONFIG_COLDFIRE */

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."