linux-kernel - Re: [PATCH v9] kallsyms: Add self-test facility

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Date:   Fri, 16 Dec 2022 12:57:03 +0100
From:   Andreas Schwab <schwab@...ux-m68k.org>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        <linux-modules@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        David Laight <David.Laight@...lab.com>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH v9] kallsyms: Add self-test facility

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