From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
To: linux-sh@vger.kernel.org
Cc: Rich Felker <dalias@libc.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de>,
linux-kernel@vger.kernel.org,
John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Subject: [PATCH] sh: Implement __get_user_u64() required for 64-bit get_user()
Date: Fri, 29 May 2020 17:45:41 +0000 [thread overview]
Message-ID: <20200529174540.4189874-2-glaubitz@physik.fu-berlin.de> (raw)
In-Reply-To: <20200529174540.4189874-1-glaubitz@physik.fu-berlin.de>
Trying to build the kernel with CONFIG_INFINIBAND_USER_ACCESS enabled fails
ERROR: "__get_user_unknown" [drivers/infiniband/core/ib_uverbs.ko] undefined!
with on SH since the kernel misses a 64-bit implementation of get_user().
Implement the missing 64-bit get_user() as __get_user_u64(), matching the
already existing __put_user_u64() which implements the 64-bit put_user().
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
---
arch/sh/include/asm/uaccess_32.h | 49 ++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/arch/sh/include/asm/uaccess_32.h b/arch/sh/include/asm/uaccess_32.h
index 624cf55acc27..8bc1cb50f8bf 100644
--- a/arch/sh/include/asm/uaccess_32.h
+++ b/arch/sh/include/asm/uaccess_32.h
@@ -26,6 +26,9 @@ do { \
case 4: \
__get_user_asm(x, ptr, retval, "l"); \
break; \
+ case 8: \
+ __get_user_u64(x, ptr, retval); \
+ break; \
default: \
__get_user_unknown(); \
break; \
@@ -66,6 +69,52 @@ do { \
extern void __get_user_unknown(void);
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+#define __get_user_u64(x, addr, err) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %2,%R1\n\t" \
+ "mov.l %T2,%S1\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov #0, %1\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3, %0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ :"=&r" (err), "=&r" (x) \
+ :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#else
+#define __get_user_u64(x, addr, err) \
+({ \
+__asm__ __volatile__( \
+ "1:\n\t" \
+ "mov.l %2,%S1\n\t" \
+ "mov.l %T2,%R1\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3:\n\t" \
+ "mov #0, %1\n\t" \
+ "mov.l 4f, %0\n\t" \
+ "jmp @%0\n\t" \
+ " mov %3, %0\n\t" \
+ ".balign 4\n" \
+ "4: .long 2b\n\t" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n\t" \
+ ".long 1b, 3b\n\t" \
+ ".previous" \
+ :"=&r" (err), "=&r" (x) \
+ :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#endif
+
#define __put_user_size(x,ptr,size,retval) \
do { \
retval = 0; \
--
2.27.0.rc2
next prev parent reply other threads:[~2020-05-29 17:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-29 17:45 [RESEND] sh: Implement __get_user_u64() required for 64-bit get_user() John Paul Adrian Glaubitz
2020-05-29 17:45 ` John Paul Adrian Glaubitz [this message]
2020-05-31 9:52 ` [PATCH] " Geert Uytterhoeven
2020-05-31 9:54 ` John Paul Adrian Glaubitz
2020-05-31 9:59 ` John Paul Adrian Glaubitz
2020-05-31 10:43 ` Geert Uytterhoeven
2020-05-31 10:52 ` John Paul Adrian Glaubitz
2020-06-01 3:03 ` Rich Felker
2020-06-01 9:02 ` Geert Uytterhoeven
2020-06-01 9:13 ` John Paul Adrian Glaubitz
2020-06-01 16:57 ` Rich Felker
2020-06-01 20:26 ` Michael Karcher
2020-06-01 20:50 ` Rich Felker
2020-06-02 10:19 ` Michael Karcher
-- strict thread matches above, loose matches on Subject: below --
2020-06-11 7:58 [PATCH v3] " John Paul Adrian Glaubitz
2020-06-11 7:58 ` [PATCH] " John Paul Adrian Glaubitz
2020-06-27 15:26 ` Yoshinori Sato
2020-05-29 17:34 John Paul Adrian Glaubitz
2020-05-29 17:34 ` [PATCH] sh: Implement __get_user_u64() required for 64-bit get_user() John Paul Adrian Glaubitz
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