Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * arch/alpha/lib/copy_user.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copy to/from user space, handling exceptions as we go..  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * isn't exactly pretty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * This is essentially the same as "memcpy()", but with a few twists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Notably, we have to make sure that $0 is always up-to-date and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * contains the right "bytes left to copy" value (and that it is updated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * only _after_ a successful copy). There is also some rather minor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * exception setup stuff..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /* Allow an exception for an insn; exit if we get one.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define EXI(x,y...)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	99: x,##y;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	.section __ex_table,"a";	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	.long 99b - .;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	lda $31, $exitin-99b($31);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	.previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define EXO(x,y...)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	99: x,##y;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	.section __ex_table,"a";	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	.long 99b - .;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	lda $31, $exitout-99b($31);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	.previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	.set noat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	.globl __copy_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	.ent __copy_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) __copy_user:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	.prologue 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	mov $18,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	and $16,7,$3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	beq $0,$35
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	beq $3,$36
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	subq $3,8,$3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) $37:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	EXI( ldq_u $1,0($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	EXO( ldq_u $2,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	extbl $1,$17,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	mskbl $2,$16,$2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	insbl $1,$16,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	addq $3,1,$3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	bis $1,$2,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	EXO( stq_u $1,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	subq $0,1,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	addq $16,1,$16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	addq $17,1,$17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	beq $0,$41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	bne $3,$37
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) $36:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	and $17,7,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	bic $0,7,$4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	beq $1,$43
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	beq $4,$48
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	EXI( ldq_u $3,0($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) $50:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	EXI( ldq_u $2,8($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	subq $4,8,$4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	extql $3,$17,$3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	extqh $2,$17,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	bis $3,$1,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	EXO( stq $1,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	addq $17,8,$17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	subq $0,8,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	addq $16,8,$16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	bis $2,$2,$3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	bne $4,$50
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) $48:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	beq $0,$41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) $57:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	EXI( ldq_u $1,0($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	EXO( ldq_u $2,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	extbl $1,$17,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	mskbl $2,$16,$2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	insbl $1,$16,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	bis $1,$2,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	EXO( stq_u $1,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	subq $0,1,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	addq $16,1,$16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	addq $17,1,$17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	bne $0,$57
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	br $31,$41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) $43:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	beq $4,$65
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	.align 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) $66:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	EXI( ldq $1,0($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	subq $4,8,$4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	EXO( stq $1,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	addq $17,8,$17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	subq $0,8,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	addq $16,8,$16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	bne $4,$66
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) $65:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	beq $0,$41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	EXI( ldq $2,0($17) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	EXO( ldq $1,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	mskql $2,$0,$2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	mskqh $1,$0,$1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	bis $2,$1,$2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	EXO( stq $2,0($16) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	bis $31,$31,$0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) $41:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) $35:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) $exitin:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) $exitout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ret $31,($26),1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	.end __copy_user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) EXPORT_SYMBOL(__copy_user)