alpha: switch __copy_user() and __do_clean_user() to normal calling conventions
They used to need odd calling conventions due to old exception handling mechanism, the last remnants of which had disappeared back in 2002. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
d597580d37
commit
8525023121
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@ -334,45 +334,17 @@ __asm__ __volatile__("1: stb %r2,%1\n" \
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* Complex access routines
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*/
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/* This little bit of silliness is to get the GP loaded for a function
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that ordinarily wouldn't. Otherwise we could have it done by the macro
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directly, which can be optimized the linker. */
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#ifdef MODULE
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#define __module_address(sym) "r"(sym),
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#define __module_call(ra, arg, sym) "jsr $" #ra ",(%" #arg ")," #sym
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#else
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#define __module_address(sym)
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#define __module_call(ra, arg, sym) "bsr $" #ra "," #sym " !samegp"
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#endif
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extern void __copy_user(void);
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extern inline long
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__copy_tofrom_user_nocheck(void *to, const void *from, long len)
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{
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register void * __cu_to __asm__("$6") = to;
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register const void * __cu_from __asm__("$7") = from;
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register long __cu_len __asm__("$0") = len;
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__asm__ __volatile__(
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__module_call(28, 3, __copy_user)
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: "=r" (__cu_len), "=r" (__cu_from), "=r" (__cu_to)
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: __module_address(__copy_user)
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"0" (__cu_len), "1" (__cu_from), "2" (__cu_to)
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: "$1", "$2", "$3", "$4", "$5", "$28", "memory");
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return __cu_len;
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}
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extern long __copy_user(void *to, const void *from, long len);
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#define __copy_to_user(to, from, n) \
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({ \
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__chk_user_ptr(to); \
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__copy_tofrom_user_nocheck((__force void *)(to), (from), (n)); \
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__copy_user((__force void *)(to), (from), (n)); \
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})
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#define __copy_from_user(to, from, n) \
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({ \
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__chk_user_ptr(from); \
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__copy_tofrom_user_nocheck((to), (__force void *)(from), (n)); \
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__copy_user((to), (__force void *)(from), (n)); \
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})
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#define __copy_to_user_inatomic __copy_to_user
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@ -382,7 +354,7 @@ extern inline long
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copy_to_user(void __user *to, const void *from, long n)
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{
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if (likely(__access_ok((unsigned long)to, n, get_fs())))
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n = __copy_tofrom_user_nocheck((__force void *)to, from, n);
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n = __copy_user((__force void *)to, from, n);
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return n;
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}
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@ -397,21 +369,7 @@ copy_from_user(void *to, const void __user *from, long n)
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return res;
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}
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extern void __do_clear_user(void);
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extern inline long
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__clear_user(void __user *to, long len)
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{
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register void __user * __cl_to __asm__("$6") = to;
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register long __cl_len __asm__("$0") = len;
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__asm__ __volatile__(
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__module_call(28, 2, __do_clear_user)
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: "=r"(__cl_len), "=r"(__cl_to)
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: __module_address(__do_clear_user)
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"0"(__cl_len), "1"(__cl_to)
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: "$1", "$2", "$3", "$4", "$5", "$28", "memory");
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return __cl_len;
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}
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extern long __clear_user(void __user *to, long len);
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extern inline long
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clear_user(void __user *to, long len)
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@ -421,9 +379,6 @@ clear_user(void __user *to, long len)
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return len;
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}
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#undef __module_address
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#undef __module_call
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#define user_addr_max() \
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(uaccess_kernel() ? ~0UL : TASK_SIZE)
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@ -8,21 +8,6 @@
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* right "bytes left to zero" value (and that it is updated only _after_
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* a successful copy). There is also some rather minor exception setup
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* stuff.
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*
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* NOTE! This is not directly C-callable, because the calling semantics
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* are different:
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*
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* Inputs:
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* length in $0
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* destination address in $6
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* exception pointer in $7
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* return address in $28 (exceptions expect it there)
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*
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* Outputs:
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* bytes left to copy in $0
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*
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* Clobbers:
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* $1,$2,$3,$4,$5,$6
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*/
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#include <asm/export.h>
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@ -38,62 +23,63 @@
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.set noreorder
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.align 4
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.globl __do_clear_user
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.ent __do_clear_user
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.frame $30, 0, $28
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.globl __clear_user
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.ent __clear_user
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.frame $30, 0, $26
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.prologue 0
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$loop:
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and $1, 3, $4 # e0 :
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beq $4, 1f # .. e1 :
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0: EX( stq_u $31, 0($6) ) # e0 : zero one word
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0: EX( stq_u $31, 0($16) ) # e0 : zero one word
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subq $0, 8, $0 # .. e1 :
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subq $4, 1, $4 # e0 :
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addq $6, 8, $6 # .. e1 :
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addq $16, 8, $16 # .. e1 :
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bne $4, 0b # e1 :
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unop # :
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1: bic $1, 3, $1 # e0 :
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beq $1, $tail # .. e1 :
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2: EX( stq_u $31, 0($6) ) # e0 : zero four words
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2: EX( stq_u $31, 0($16) ) # e0 : zero four words
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subq $0, 8, $0 # .. e1 :
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EX( stq_u $31, 8($6) ) # e0 :
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EX( stq_u $31, 8($16) ) # e0 :
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subq $0, 8, $0 # .. e1 :
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EX( stq_u $31, 16($6) ) # e0 :
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EX( stq_u $31, 16($16) ) # e0 :
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subq $0, 8, $0 # .. e1 :
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EX( stq_u $31, 24($6) ) # e0 :
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EX( stq_u $31, 24($16) ) # e0 :
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subq $0, 8, $0 # .. e1 :
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subq $1, 4, $1 # e0 :
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addq $6, 32, $6 # .. e1 :
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addq $16, 32, $16 # .. e1 :
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bne $1, 2b # e1 :
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$tail:
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bne $2, 1f # e1 : is there a tail to do?
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ret $31, ($28), 1 # .. e1 :
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ret $31, ($26), 1 # .. e1 :
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1: EX( ldq_u $5, 0($6) ) # e0 :
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1: EX( ldq_u $5, 0($16) ) # e0 :
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clr $0 # .. e1 :
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nop # e1 :
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mskqh $5, $0, $5 # e0 :
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EX( stq_u $5, 0($6) ) # e0 :
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ret $31, ($28), 1 # .. e1 :
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EX( stq_u $5, 0($16) ) # e0 :
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ret $31, ($26), 1 # .. e1 :
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__do_clear_user:
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and $6, 7, $4 # e0 : find dest misalignment
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__clear_user:
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and $17, $17, $0
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and $16, 7, $4 # e0 : find dest misalignment
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beq $0, $zerolength # .. e1 :
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addq $0, $4, $1 # e0 : bias counter
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and $1, 7, $2 # e1 : number of bytes in tail
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srl $1, 3, $1 # e0 :
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beq $4, $loop # .. e1 :
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EX( ldq_u $5, 0($6) ) # e0 : load dst word to mask back in
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EX( ldq_u $5, 0($16) ) # e0 : load dst word to mask back in
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beq $1, $oneword # .. e1 : sub-word store?
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mskql $5, $6, $5 # e0 : take care of misaligned head
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addq $6, 8, $6 # .. e1 :
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EX( stq_u $5, -8($6) ) # e0 :
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mskql $5, $16, $5 # e0 : take care of misaligned head
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addq $16, 8, $16 # .. e1 :
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EX( stq_u $5, -8($16) ) # e0 :
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addq $0, $4, $0 # .. e1 : bytes left -= 8 - misalignment
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subq $1, 1, $1 # e0 :
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subq $0, 8, $0 # .. e1 :
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@ -101,15 +87,15 @@ __do_clear_user:
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unop # :
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$oneword:
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mskql $5, $6, $4 # e0 :
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mskql $5, $16, $4 # e0 :
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mskqh $5, $2, $5 # e0 :
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or $5, $4, $5 # e1 :
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EX( stq_u $5, 0($6) ) # e0 :
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EX( stq_u $5, 0($16) ) # e0 :
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clr $0 # .. e1 :
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$zerolength:
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$exception:
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ret $31, ($28), 1 # .. e1 :
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ret $31, ($26), 1 # .. e1 :
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.end __do_clear_user
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EXPORT_SYMBOL(__do_clear_user)
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.end __clear_user
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EXPORT_SYMBOL(__clear_user)
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@ -9,21 +9,6 @@
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* contains the right "bytes left to copy" value (and that it is updated
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* only _after_ a successful copy). There is also some rather minor
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* exception setup stuff..
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*
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* NOTE! This is not directly C-callable, because the calling semantics are
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* different:
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*
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* Inputs:
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* length in $0
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* destination address in $6
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* source address in $7
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* return address in $28
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*
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* Outputs:
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* bytes left to copy in $0
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*
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* Clobbers:
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* $1,$2,$3,$4,$5,$6,$7
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*/
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#include <asm/export.h>
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@ -49,58 +34,59 @@
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.ent __copy_user
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__copy_user:
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.prologue 0
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and $6,7,$3
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and $18,$18,$0
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and $16,7,$3
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beq $0,$35
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beq $3,$36
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subq $3,8,$3
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.align 4
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$37:
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EXI( ldq_u $1,0($7) )
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EXO( ldq_u $2,0($6) )
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extbl $1,$7,$1
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mskbl $2,$6,$2
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insbl $1,$6,$1
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EXI( ldq_u $1,0($17) )
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EXO( ldq_u $2,0($16) )
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extbl $1,$17,$1
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mskbl $2,$16,$2
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insbl $1,$16,$1
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addq $3,1,$3
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bis $1,$2,$1
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EXO( stq_u $1,0($6) )
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EXO( stq_u $1,0($16) )
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subq $0,1,$0
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addq $6,1,$6
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addq $7,1,$7
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addq $16,1,$16
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addq $17,1,$17
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beq $0,$41
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bne $3,$37
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$36:
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and $7,7,$1
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and $17,7,$1
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bic $0,7,$4
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beq $1,$43
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beq $4,$48
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EXI( ldq_u $3,0($7) )
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EXI( ldq_u $3,0($17) )
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.align 4
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$50:
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EXI( ldq_u $2,8($7) )
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EXI( ldq_u $2,8($17) )
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subq $4,8,$4
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extql $3,$7,$3
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extqh $2,$7,$1
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extql $3,$17,$3
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extqh $2,$17,$1
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bis $3,$1,$1
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EXO( stq $1,0($6) )
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addq $7,8,$7
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EXO( stq $1,0($16) )
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addq $17,8,$17
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subq $0,8,$0
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addq $6,8,$6
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addq $16,8,$16
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bis $2,$2,$3
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bne $4,$50
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$48:
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beq $0,$41
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.align 4
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$57:
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EXI( ldq_u $1,0($7) )
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EXO( ldq_u $2,0($6) )
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extbl $1,$7,$1
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mskbl $2,$6,$2
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insbl $1,$6,$1
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EXI( ldq_u $1,0($17) )
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EXO( ldq_u $2,0($16) )
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extbl $1,$17,$1
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mskbl $2,$16,$2
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insbl $1,$16,$1
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bis $1,$2,$1
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EXO( stq_u $1,0($6) )
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EXO( stq_u $1,0($16) )
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subq $0,1,$0
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addq $6,1,$6
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addq $7,1,$7
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addq $16,1,$16
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addq $17,1,$17
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bne $0,$57
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br $31,$41
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.align 4
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@ -108,27 +94,27 @@ $43:
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beq $4,$65
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.align 4
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$66:
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EXI( ldq $1,0($7) )
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EXI( ldq $1,0($17) )
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subq $4,8,$4
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EXO( stq $1,0($6) )
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addq $7,8,$7
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EXO( stq $1,0($16) )
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addq $17,8,$17
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subq $0,8,$0
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addq $6,8,$6
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addq $16,8,$16
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bne $4,$66
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$65:
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beq $0,$41
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EXI( ldq $2,0($7) )
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EXO( ldq $1,0($6) )
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EXI( ldq $2,0($17) )
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EXO( ldq $1,0($16) )
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mskql $2,$0,$2
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mskqh $1,$0,$1
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bis $2,$1,$2
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EXO( stq $2,0($6) )
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EXO( stq $2,0($16) )
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bis $31,$31,$0
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$41:
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$35:
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$exitin:
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$exitout:
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ret $31,($28),1
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ret $31,($26),1
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.end __copy_user
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EXPORT_SYMBOL(__copy_user)
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@ -9,21 +9,6 @@
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* a successful copy). There is also some rather minor exception setup
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* stuff.
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*
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* NOTE! This is not directly C-callable, because the calling semantics
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* are different:
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*
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* Inputs:
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* length in $0
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* destination address in $6
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* exception pointer in $7
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* return address in $28 (exceptions expect it there)
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*
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* Outputs:
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* bytes left to copy in $0
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*
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* Clobbers:
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* $1,$2,$3,$4,$5,$6
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*
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* Much of the information about 21264 scheduling/coding comes from:
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* Compiler Writer's Guide for the Alpha 21264
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* abbreviated as 'CWG' in other comments here
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@ -56,14 +41,15 @@
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.set noreorder
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.align 4
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.globl __do_clear_user
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.ent __do_clear_user
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.frame $30, 0, $28
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.globl __clear_user
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.ent __clear_user
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.frame $30, 0, $26
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.prologue 0
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# Pipeline info : Slotting & Comments
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__do_clear_user:
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and $6, 7, $4 # .. E .. .. : find dest head misalignment
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__clear_user:
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and $17, $17, $0
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and $16, 7, $4 # .. E .. .. : find dest head misalignment
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beq $0, $zerolength # U .. .. .. : U L U L
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addq $0, $4, $1 # .. .. .. E : bias counter
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@ -75,14 +61,14 @@ __do_clear_user:
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/*
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* Head is not aligned. Write (8 - $4) bytes to head of destination
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* This means $6 is known to be misaligned
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* This means $16 is known to be misaligned
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*/
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EX( ldq_u $5, 0($6) ) # .. .. .. L : load dst word to mask back in
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EX( ldq_u $5, 0($16) ) # .. .. .. L : load dst word to mask back in
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beq $1, $onebyte # .. .. U .. : sub-word store?
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mskql $5, $6, $5 # .. U .. .. : take care of misaligned head
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addq $6, 8, $6 # E .. .. .. : L U U L
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mskql $5, $16, $5 # .. U .. .. : take care of misaligned head
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addq $16, 8, $16 # E .. .. .. : L U U L
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EX( stq_u $5, -8($6) ) # .. .. .. L :
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EX( stq_u $5, -8($16) ) # .. .. .. L :
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subq $1, 1, $1 # .. .. E .. :
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addq $0, $4, $0 # .. E .. .. : bytes left -= 8 - misalignment
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subq $0, 8, $0 # E .. .. .. : U L U L
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@ -93,11 +79,11 @@ __do_clear_user:
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* values upon initial entry to the loop
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* $1 is number of quadwords to clear (zero is a valid value)
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* $2 is number of trailing bytes (0..7) ($2 never used...)
|
||||
* $6 is known to be aligned 0mod8
|
||||
* $16 is known to be aligned 0mod8
|
||||
*/
|
||||
$headalign:
|
||||
subq $1, 16, $4 # .. .. .. E : If < 16, we can not use the huge loop
|
||||
and $6, 0x3f, $2 # .. .. E .. : Forward work for huge loop
|
||||
and $16, 0x3f, $2 # .. .. E .. : Forward work for huge loop
|
||||
subq $2, 0x40, $3 # .. E .. .. : bias counter (huge loop)
|
||||
blt $4, $trailquad # U .. .. .. : U L U L
|
||||
|
||||
|
|
@ -114,21 +100,21 @@ $headalign:
|
|||
beq $3, $bigalign # U .. .. .. : U L U L : Aligned 0mod64
|
||||
|
||||
$alignmod64:
|
||||
EX( stq_u $31, 0($6) ) # .. .. .. L
|
||||
EX( stq_u $31, 0($16) ) # .. .. .. L
|
||||
addq $3, 8, $3 # .. .. E ..
|
||||
subq $0, 8, $0 # .. E .. ..
|
||||
nop # E .. .. .. : U L U L
|
||||
|
||||
nop # .. .. .. E
|
||||
subq $1, 1, $1 # .. .. E ..
|
||||
addq $6, 8, $6 # .. E .. ..
|
||||
addq $16, 8, $16 # .. E .. ..
|
||||
blt $3, $alignmod64 # U .. .. .. : U L U L
|
||||
|
||||
$bigalign:
|
||||
/*
|
||||
* $0 is the number of bytes left
|
||||
* $1 is the number of quads left
|
||||
* $6 is aligned 0mod64
|
||||
* $16 is aligned 0mod64
|
||||
* we know that we'll be taking a minimum of one trip through
|
||||
* CWG Section 3.7.6: do not expect a sustained store rate of > 1/cycle
|
||||
* We are _not_ going to update $0 after every single store. That
|
||||
|
|
@ -145,39 +131,39 @@ $bigalign:
|
|||
nop # E :
|
||||
nop # E :
|
||||
nop # E :
|
||||
bis $6,$6,$3 # E : U L U L : Initial wh64 address is dest
|
||||
bis $16,$16,$3 # E : U L U L : Initial wh64 address is dest
|
||||
/* This might actually help for the current trip... */
|
||||
|
||||
$do_wh64:
|
||||
wh64 ($3) # .. .. .. L1 : memory subsystem hint
|
||||
subq $1, 16, $4 # .. .. E .. : Forward calculation - repeat the loop?
|
||||
EX( stq_u $31, 0($6) ) # .. L .. ..
|
||||
EX( stq_u $31, 0($16) ) # .. L .. ..
|
||||
subq $0, 8, $0 # E .. .. .. : U L U L
|
||||
|
||||
addq $6, 128, $3 # E : Target address of wh64
|
||||
EX( stq_u $31, 8($6) ) # L :
|
||||
EX( stq_u $31, 16($6) ) # L :
|
||||
addq $16, 128, $3 # E : Target address of wh64
|
||||
EX( stq_u $31, 8($16) ) # L :
|
||||
EX( stq_u $31, 16($16) ) # L :
|
||||
subq $0, 16, $0 # E : U L L U
|
||||
|
||||
nop # E :
|
||||
EX( stq_u $31, 24($6) ) # L :
|
||||
EX( stq_u $31, 32($6) ) # L :
|
||||
EX( stq_u $31, 24($16) ) # L :
|
||||
EX( stq_u $31, 32($16) ) # L :
|
||||
subq $0, 168, $5 # E : U L L U : two trips through the loop left?
|
||||
/* 168 = 192 - 24, since we've already completed some stores */
|
||||
|
||||
subq $0, 16, $0 # E :
|
||||
EX( stq_u $31, 40($6) ) # L :
|
||||
EX( stq_u $31, 48($6) ) # L :
|
||||
cmovlt $5, $6, $3 # E : U L L U : Latency 2, extra mapping cycle
|
||||
EX( stq_u $31, 40($16) ) # L :
|
||||
EX( stq_u $31, 48($16) ) # L :
|
||||
cmovlt $5, $16, $3 # E : U L L U : Latency 2, extra mapping cycle
|
||||
|
||||
subq $1, 8, $1 # E :
|
||||
subq $0, 16, $0 # E :
|
||||
EX( stq_u $31, 56($6) ) # L :
|
||||
EX( stq_u $31, 56($16) ) # L :
|
||||
nop # E : U L U L
|
||||
|
||||
nop # E :
|
||||
subq $0, 8, $0 # E :
|
||||
addq $6, 64, $6 # E :
|
||||
addq $16, 64, $16 # E :
|
||||
bge $4, $do_wh64 # U : U L U L
|
||||
|
||||
$trailquad:
|
||||
|
|
@ -190,14 +176,14 @@ $trailquad:
|
|||
beq $1, $trailbytes # U .. .. .. : U L U L : Only 0..7 bytes to go
|
||||
|
||||
$onequad:
|
||||
EX( stq_u $31, 0($6) ) # .. .. .. L
|
||||
EX( stq_u $31, 0($16) ) # .. .. .. L
|
||||
subq $1, 1, $1 # .. .. E ..
|
||||
subq $0, 8, $0 # .. E .. ..
|
||||
nop # E .. .. .. : U L U L
|
||||
|
||||
nop # .. .. .. E
|
||||
nop # .. .. E ..
|
||||
addq $6, 8, $6 # .. E .. ..
|
||||
addq $16, 8, $16 # .. E .. ..
|
||||
bgt $1, $onequad # U .. .. .. : U L U L
|
||||
|
||||
# We have an unknown number of bytes left to go.
|
||||
|
|
@ -211,9 +197,9 @@ $trailbytes:
|
|||
# so we will use $0 as the loop counter
|
||||
# We know for a fact that $0 > 0 zero due to previous context
|
||||
$onebyte:
|
||||
EX( stb $31, 0($6) ) # .. .. .. L
|
||||
EX( stb $31, 0($16) ) # .. .. .. L
|
||||
subq $0, 1, $0 # .. .. E .. :
|
||||
addq $6, 1, $6 # .. E .. .. :
|
||||
addq $16, 1, $16 # .. E .. .. :
|
||||
bgt $0, $onebyte # U .. .. .. : U L U L
|
||||
|
||||
$zerolength:
|
||||
|
|
@ -221,6 +207,6 @@ $exception: # Destination for exception recovery(?)
|
|||
nop # .. .. .. E :
|
||||
nop # .. .. E .. :
|
||||
nop # .. E .. .. :
|
||||
ret $31, ($28), 1 # L0 .. .. .. : L U L U
|
||||
.end __do_clear_user
|
||||
EXPORT_SYMBOL(__do_clear_user)
|
||||
ret $31, ($26), 1 # L0 .. .. .. : L U L U
|
||||
.end __clear_user
|
||||
EXPORT_SYMBOL(__clear_user)
|
||||
|
|
|
|||
|
|
@ -12,21 +12,6 @@
|
|||
* only _after_ a successful copy). There is also some rather minor
|
||||
* exception setup stuff..
|
||||
*
|
||||
* NOTE! This is not directly C-callable, because the calling semantics are
|
||||
* different:
|
||||
*
|
||||
* Inputs:
|
||||
* length in $0
|
||||
* destination address in $6
|
||||
* source address in $7
|
||||
* return address in $28
|
||||
*
|
||||
* Outputs:
|
||||
* bytes left to copy in $0
|
||||
*
|
||||
* Clobbers:
|
||||
* $1,$2,$3,$4,$5,$6,$7
|
||||
*
|
||||
* Much of the information about 21264 scheduling/coding comes from:
|
||||
* Compiler Writer's Guide for the Alpha 21264
|
||||
* abbreviated as 'CWG' in other comments here
|
||||
|
|
@ -60,10 +45,11 @@
|
|||
# Pipeline info: Slotting & Comments
|
||||
__copy_user:
|
||||
.prologue 0
|
||||
subq $0, 32, $1 # .. E .. .. : Is this going to be a small copy?
|
||||
andq $18, $18, $0
|
||||
subq $18, 32, $1 # .. E .. .. : Is this going to be a small copy?
|
||||
beq $0, $zerolength # U .. .. .. : U L U L
|
||||
|
||||
and $6,7,$3 # .. .. .. E : is leading dest misalignment
|
||||
and $16,7,$3 # .. .. .. E : is leading dest misalignment
|
||||
ble $1, $onebyteloop # .. .. U .. : 1st branch : small amount of data
|
||||
beq $3, $destaligned # .. U .. .. : 2nd (one cycle fetcher stall)
|
||||
subq $3, 8, $3 # E .. .. .. : L U U L : trip counter
|
||||
|
|
@ -73,17 +59,17 @@ __copy_user:
|
|||
* We know we have at least one trip through this loop
|
||||
*/
|
||||
$aligndest:
|
||||
EXI( ldbu $1,0($7) ) # .. .. .. L : Keep loads separate from stores
|
||||
addq $6,1,$6 # .. .. E .. : Section 3.8 in the CWG
|
||||
EXI( ldbu $1,0($17) ) # .. .. .. L : Keep loads separate from stores
|
||||
addq $16,1,$16 # .. .. E .. : Section 3.8 in the CWG
|
||||
addq $3,1,$3 # .. E .. .. :
|
||||
nop # E .. .. .. : U L U L
|
||||
|
||||
/*
|
||||
* the -1 is to compensate for the inc($6) done in a previous quadpack
|
||||
* the -1 is to compensate for the inc($16) done in a previous quadpack
|
||||
* which allows us zero dependencies within either quadpack in the loop
|
||||
*/
|
||||
EXO( stb $1,-1($6) ) # .. .. .. L :
|
||||
addq $7,1,$7 # .. .. E .. : Section 3.8 in the CWG
|
||||
EXO( stb $1,-1($16) ) # .. .. .. L :
|
||||
addq $17,1,$17 # .. .. E .. : Section 3.8 in the CWG
|
||||
subq $0,1,$0 # .. E .. .. :
|
||||
bne $3, $aligndest # U .. .. .. : U L U L
|
||||
|
||||
|
|
@ -92,29 +78,29 @@ $aligndest:
|
|||
* If we arrived via branch, we have a minimum of 32 bytes
|
||||
*/
|
||||
$destaligned:
|
||||
and $7,7,$1 # .. .. .. E : Check _current_ source alignment
|
||||
and $17,7,$1 # .. .. .. E : Check _current_ source alignment
|
||||
bic $0,7,$4 # .. .. E .. : number bytes as a quadword loop
|
||||
EXI( ldq_u $3,0($7) ) # .. L .. .. : Forward fetch for fallthrough code
|
||||
EXI( ldq_u $3,0($17) ) # .. L .. .. : Forward fetch for fallthrough code
|
||||
beq $1,$quadaligned # U .. .. .. : U L U L
|
||||
|
||||
/*
|
||||
* In the worst case, we've just executed an ldq_u here from 0($7)
|
||||
* In the worst case, we've just executed an ldq_u here from 0($17)
|
||||
* and we'll repeat it once if we take the branch
|
||||
*/
|
||||
|
||||
/* Misaligned quadword loop - not unrolled. Leave it that way. */
|
||||
$misquad:
|
||||
EXI( ldq_u $2,8($7) ) # .. .. .. L :
|
||||
EXI( ldq_u $2,8($17) ) # .. .. .. L :
|
||||
subq $4,8,$4 # .. .. E .. :
|
||||
extql $3,$7,$3 # .. U .. .. :
|
||||
extqh $2,$7,$1 # U .. .. .. : U U L L
|
||||
extql $3,$17,$3 # .. U .. .. :
|
||||
extqh $2,$17,$1 # U .. .. .. : U U L L
|
||||
|
||||
bis $3,$1,$1 # .. .. .. E :
|
||||
EXO( stq $1,0($6) ) # .. .. L .. :
|
||||
addq $7,8,$7 # .. E .. .. :
|
||||
EXO( stq $1,0($16) ) # .. .. L .. :
|
||||
addq $17,8,$17 # .. E .. .. :
|
||||
subq $0,8,$0 # E .. .. .. : U L L U
|
||||
|
||||
addq $6,8,$6 # .. .. .. E :
|
||||
addq $16,8,$16 # .. .. .. E :
|
||||
bis $2,$2,$3 # .. .. E .. :
|
||||
nop # .. E .. .. :
|
||||
bne $4,$misquad # U .. .. .. : U L U L
|
||||
|
|
@ -125,8 +111,8 @@ $misquad:
|
|||
beq $0,$zerolength # U .. .. .. : U L U L
|
||||
|
||||
/* We know we have at least one trip through the byte loop */
|
||||
EXI ( ldbu $2,0($7) ) # .. .. .. L : No loads in the same quad
|
||||
addq $6,1,$6 # .. .. E .. : as the store (Section 3.8 in CWG)
|
||||
EXI ( ldbu $2,0($17) ) # .. .. .. L : No loads in the same quad
|
||||
addq $16,1,$16 # .. .. E .. : as the store (Section 3.8 in CWG)
|
||||
nop # .. E .. .. :
|
||||
br $31, $dirtyentry # L0 .. .. .. : L U U L
|
||||
/* Do the trailing byte loop load, then hop into the store part of the loop */
|
||||
|
|
@ -136,8 +122,8 @@ $misquad:
|
|||
* Based upon the usage context, it's worth the effort to unroll this loop
|
||||
* $0 - number of bytes to be moved
|
||||
* $4 - number of bytes to move as quadwords
|
||||
* $6 is current destination address
|
||||
* $7 is current source address
|
||||
* $16 is current destination address
|
||||
* $17 is current source address
|
||||
*/
|
||||
$quadaligned:
|
||||
subq $4, 32, $2 # .. .. .. E : do not unroll for small stuff
|
||||
|
|
@ -155,29 +141,29 @@ $quadaligned:
|
|||
* instruction memory hint instruction).
|
||||
*/
|
||||
$unroll4:
|
||||
EXI( ldq $1,0($7) ) # .. .. .. L
|
||||
EXI( ldq $2,8($7) ) # .. .. L ..
|
||||
EXI( ldq $1,0($17) ) # .. .. .. L
|
||||
EXI( ldq $2,8($17) ) # .. .. L ..
|
||||
subq $4,32,$4 # .. E .. ..
|
||||
nop # E .. .. .. : U U L L
|
||||
|
||||
addq $7,16,$7 # .. .. .. E
|
||||
EXO( stq $1,0($6) ) # .. .. L ..
|
||||
EXO( stq $2,8($6) ) # .. L .. ..
|
||||
addq $17,16,$17 # .. .. .. E
|
||||
EXO( stq $1,0($16) ) # .. .. L ..
|
||||
EXO( stq $2,8($16) ) # .. L .. ..
|
||||
subq $0,16,$0 # E .. .. .. : U L L U
|
||||
|
||||
addq $6,16,$6 # .. .. .. E
|
||||
EXI( ldq $1,0($7) ) # .. .. L ..
|
||||
EXI( ldq $2,8($7) ) # .. L .. ..
|
||||
addq $16,16,$16 # .. .. .. E
|
||||
EXI( ldq $1,0($17) ) # .. .. L ..
|
||||
EXI( ldq $2,8($17) ) # .. L .. ..
|
||||
subq $4, 32, $3 # E .. .. .. : U U L L : is there enough for another trip?
|
||||
|
||||
EXO( stq $1,0($6) ) # .. .. .. L
|
||||
EXO( stq $2,8($6) ) # .. .. L ..
|
||||
EXO( stq $1,0($16) ) # .. .. .. L
|
||||
EXO( stq $2,8($16) ) # .. .. L ..
|
||||
subq $0,16,$0 # .. E .. ..
|
||||
addq $7,16,$7 # E .. .. .. : U L L U
|
||||
addq $17,16,$17 # E .. .. .. : U L L U
|
||||
|
||||
nop # .. .. .. E
|
||||
nop # .. .. E ..
|
||||
addq $6,16,$6 # .. E .. ..
|
||||
addq $16,16,$16 # .. E .. ..
|
||||
bgt $3,$unroll4 # U .. .. .. : U L U L
|
||||
|
||||
nop
|
||||
|
|
@ -186,14 +172,14 @@ $unroll4:
|
|||
beq $4, $noquads
|
||||
|
||||
$onequad:
|
||||
EXI( ldq $1,0($7) )
|
||||
EXI( ldq $1,0($17) )
|
||||
subq $4,8,$4
|
||||
addq $7,8,$7
|
||||
addq $17,8,$17
|
||||
nop
|
||||
|
||||
EXO( stq $1,0($6) )
|
||||
EXO( stq $1,0($16) )
|
||||
subq $0,8,$0
|
||||
addq $6,8,$6
|
||||
addq $16,8,$16
|
||||
bne $4,$onequad
|
||||
|
||||
$noquads:
|
||||
|
|
@ -207,23 +193,23 @@ $noquads:
|
|||
* There's no point in doing a lot of complex alignment calculations to try to
|
||||
* to quadword stuff for a small amount of data.
|
||||
* $0 - remaining number of bytes left to copy
|
||||
* $6 - current dest addr
|
||||
* $7 - current source addr
|
||||
* $16 - current dest addr
|
||||
* $17 - current source addr
|
||||
*/
|
||||
|
||||
$onebyteloop:
|
||||
EXI ( ldbu $2,0($7) ) # .. .. .. L : No loads in the same quad
|
||||
addq $6,1,$6 # .. .. E .. : as the store (Section 3.8 in CWG)
|
||||
EXI ( ldbu $2,0($17) ) # .. .. .. L : No loads in the same quad
|
||||
addq $16,1,$16 # .. .. E .. : as the store (Section 3.8 in CWG)
|
||||
nop # .. E .. .. :
|
||||
nop # E .. .. .. : U L U L
|
||||
|
||||
$dirtyentry:
|
||||
/*
|
||||
* the -1 is to compensate for the inc($6) done in a previous quadpack
|
||||
* the -1 is to compensate for the inc($16) done in a previous quadpack
|
||||
* which allows us zero dependencies within either quadpack in the loop
|
||||
*/
|
||||
EXO ( stb $2,-1($6) ) # .. .. .. L :
|
||||
addq $7,1,$7 # .. .. E .. : quadpack as the load
|
||||
EXO ( stb $2,-1($16) ) # .. .. .. L :
|
||||
addq $17,1,$17 # .. .. E .. : quadpack as the load
|
||||
subq $0,1,$0 # .. E .. .. : change count _after_ copy
|
||||
bgt $0,$onebyteloop # U .. .. .. : U L U L
|
||||
|
||||
|
|
@ -233,7 +219,7 @@ $exitout: # Destination for exception recovery(?)
|
|||
nop # .. .. .. E
|
||||
nop # .. .. E ..
|
||||
nop # .. E .. ..
|
||||
ret $31,($28),1 # L0 .. .. .. : L U L U
|
||||
ret $31,($26),1 # L0 .. .. .. : L U L U
|
||||
|
||||
.end __copy_user
|
||||
EXPORT_SYMBOL(__copy_user)
|
||||
|
|
|
|||
Loading…
Reference in New Issue