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s390/uaccess: add missing EX_TABLE entries to __clear_user() 

For some exception types the instruction address points behind the
instruction that caused the exception. Take that into account and add
the missing exception table entries.

Cc: <stable@vger.kernel.org>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-10-18 13:39:43 +02:00 committed by Vasily Gorbik
parent d6d9875e22
commit 4e1b5a86a5
1 changed files with 3 additions and 3 deletions
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6
arch/s390/lib/uaccess.c
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@ -157,7 +157,7 @@ unsigned long __clear_user(void __user *to, unsigned long size)
asm volatile(
" lr 0,%[spec]\n"
"0: mvcos 0(%1),0(%4),%0\n"
" jz 4f\n"
"6: jz 4f\n"
"1: algr %0,%2\n"
" slgr %1,%2\n"
" j 0b\n"
@ -167,11 +167,11 @@ unsigned long __clear_user(void __user *to, unsigned long size)
" clgr %0,%3\n" /* copy crosses next page boundary? */
" jnh 5f\n"
"3: mvcos 0(%1),0(%4),%3\n"
" slgr %0,%3\n"
"7: slgr %0,%3\n"
" j 5f\n"
"4: slgr %0,%0\n"
"5:\n"
EX_TABLE(0b,2b) EX_TABLE(3b,5b)
EX_TABLE(0b,2b) EX_TABLE(6b,2b) EX_TABLE(3b,5b) EX_TABLE(7b,5b)
: "+a" (size), "+a" (to), "+a" (tmp1), "=a" (tmp2)
: "a" (empty_zero_page), [spec] "d" (spec.val)
: "cc", "memory", "0");