Commit 5620eb31 authored by James Hogan's avatar James Hogan Committed by Greg Kroah-Hartman

metag/usercopy: Set flags before ADDZ

commit fd40eee1 upstream.

The fixup code for the copy_to_user rapf loops reads TXStatus.LSM_STEP
to decide how far to rewind the source pointer. There is a special case
for the last execution of an MGETL/MGETD, since it leaves LSM_STEP=0
even though the number of MGETLs/MGETDs attempted was 4. This uses ADDZ
which is conditional upon the Z condition flag, but the AND instruction
which masked the TXStatus.LSM_STEP field didn't set the condition flags
based on the result.

Fix that now by using ANDS which does set the flags, and also marking
the condition codes as clobbered by the inline assembly.

Fixes: 373cd784 ("metag: Memory handling")
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c02ee85c
......@@ -315,7 +315,7 @@
" .previous\n" \
: "=r" (to), "=r" (from), "=r" (ret), "=d" (n) \
: "0" (to), "1" (from), "2" (ret), "3" (n) \
: "D1Ar1", "D0Ar2", "memory")
: "D1Ar1", "D0Ar2", "cc", "memory")
/* rewind 'to' and 'from' pointers when a fault occurs
*
......@@ -341,7 +341,7 @@
#define __asm_copy_to_user_64bit_rapf_loop(to, from, ret, n, id)\
__asm_copy_user_64bit_rapf_loop(to, from, ret, n, id, \
"LSR D0Ar2, D0Ar2, #8\n" \
"AND D0Ar2, D0Ar2, #0x7\n" \
"ANDS D0Ar2, D0Ar2, #0x7\n" \
"ADDZ D0Ar2, D0Ar2, #4\n" \
"SUB D0Ar2, D0Ar2, #1\n" \
"MOV D1Ar1, #4\n" \
......@@ -486,7 +486,7 @@
" .previous\n" \
: "=r" (to), "=r" (from), "=r" (ret), "=d" (n) \
: "0" (to), "1" (from), "2" (ret), "3" (n) \
: "D1Ar1", "D0Ar2", "memory")
: "D1Ar1", "D0Ar2", "cc", "memory")
/* rewind 'to' and 'from' pointers when a fault occurs
*
......@@ -512,7 +512,7 @@
#define __asm_copy_to_user_32bit_rapf_loop(to, from, ret, n, id)\
__asm_copy_user_32bit_rapf_loop(to, from, ret, n, id, \
"LSR D0Ar2, D0Ar2, #8\n" \
"AND D0Ar2, D0Ar2, #0x7\n" \
"ANDS D0Ar2, D0Ar2, #0x7\n" \
"ADDZ D0Ar2, D0Ar2, #4\n" \
"SUB D0Ar2, D0Ar2, #1\n" \
"MOV D1Ar1, #4\n" \
......
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