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MIPS: Unify memcpy.S and memcpy-inatomic.S

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We can save the 451 lines of code that comprise memcpy-inatomic.S at the
expense of a single instruction in the memcpy prolog.  We also use an
additional register (t6), so this may cause increased register pressure in
some places as well.  But I think the reduced maintenance burden, of not
having two nearly identical implementations, makes it worth it.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
2012-06-06 23:00:31 +01:00
committed by Ralf Baechle
parent 914f848077
commit bb0757ebb9
4 changed files with 15 additions and 455 deletions
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6
arch/mips/include/asm/uaccess.h
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@@ -687,7 +687,7 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
__MODULE_JAL(__copy_user) \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
DADDI_SCRATCH, "memory"); \
__cu_len_r; \
})
@@ -797,7 +797,7 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
".set\treorder" \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
DADDI_SCRATCH, "memory"); \
__cu_len_r; \
})
@@ -820,7 +820,7 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
".set\treorder" \
: "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
: \
: "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
: "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
DADDI_SCRATCH, "memory"); \
__cu_len_r; \
})