Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (c) 1996, 1998, 1999, 2004 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (c) 1999 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <asm/asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/regdef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define EX(insn,reg,addr,handler)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 9:	insn	reg, addr;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	.section __ex_table,"a";			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	PTR	9b, handler;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	.previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * Return the size of a string including the ending NUL character up to a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * maximum of a1 or 0 in case of error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * Note: for performance reasons we deliberately accept that a user may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  *	 make strlen_user and strnlen_user access the first few KSEG0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  *	 bytes.	 There's nothing secret there.	On 64-bit accessing beyond
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  *	 the maximum is a tad hairier ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	.macro __BUILD_STRNLEN_ASM func
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) LEAF(__strnlen_\func\()_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	LONG_L		v0, TI_ADDR_LIMIT($28)	# pointer ok?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	and		v0, a0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	bnez		v0, .Lfault\@
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	move		v0, a0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	PTR_ADDU	a1, a0			# stop pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #ifdef CONFIG_CPU_DADDI_WORKAROUNDS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	.set		noat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	li		AT, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	beq		v0, a1, 1f		# limit reached?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .ifeqs "\func", "kernel"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	EX(lb, t0, (v0), .Lfault\@)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	EX(lbe, t0, (v0), .Lfault\@)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	.set		noreorder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	bnez		t0, 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #ifndef CONFIG_CPU_DADDI_WORKAROUNDS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	 PTR_ADDIU	v0, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	 PTR_ADDU	v0, AT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	.set		at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	.set		reorder
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	PTR_SUBU	v0, a0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	jr		ra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	END(__strnlen_\func\()_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) .Lfault\@:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	move		v0, zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	jr		ra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #ifndef CONFIG_EVA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	/* Set aliases */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	.global __strnlen_user_asm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	.set __strnlen_user_asm, __strnlen_kernel_asm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) EXPORT_SYMBOL(__strnlen_user_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) __BUILD_STRNLEN_ASM kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) EXPORT_SYMBOL(__strnlen_kernel_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #ifdef CONFIG_EVA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	.set push
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	.set eva
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) __BUILD_STRNLEN_ASM user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	.set pop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) EXPORT_SYMBOL(__strnlen_user_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #endif