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MIPS: Octeon: Implement Octeon specific __copy_user_inatomic
The generic version seems to prefetch past the end of memory. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3929/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -163,6 +163,14 @@
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.set noreorder
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.set noat
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/*
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* t7 is used as a flag to note inatomic mode.
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*/
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LEAF(__copy_user_inatomic)
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b __copy_user_common
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li t7, 1
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END(__copy_user_inatomic)
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/*
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* A combined memcpy/__copy_user
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* __copy_user sets len to 0 for success; else to an upper bound of
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@ -174,6 +182,8 @@ LEAF(memcpy) /* a0=dst a1=src a2=len */
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move v0, dst /* return value */
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__memcpy:
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FEXPORT(__copy_user)
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li t7, 0 /* not inatomic */
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__copy_user_common:
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/*
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* Note: dst & src may be unaligned, len may be 0
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* Temps
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@ -412,7 +422,6 @@ l_exc_copy:
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* Assumes src < THREAD_BUADDR($28)
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*/
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LOAD t0, TI_TASK($28)
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nop
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LOAD t0, THREAD_BUADDR(t0)
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1:
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EXC( lb t1, 0(src), l_exc)
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@ -422,10 +431,9 @@ EXC( lb t1, 0(src), l_exc)
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ADD dst, dst, 1
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l_exc:
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LOAD t0, TI_TASK($28)
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nop
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LOAD t0, THREAD_BUADDR(t0) # t0 is just past last good address
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nop
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SUB len, AT, t0 # len number of uncopied bytes
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bnez t7, 2f /* Skip the zeroing out part if inatomic */
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/*
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* Here's where we rely on src and dst being incremented in tandem,
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* See (3) above.
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@ -443,7 +451,7 @@ l_exc:
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ADD dst, dst, 1
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bnez src, 1b
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SUB src, src, 1
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jr ra
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2: jr ra
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nop
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