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, 1999 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 2011 MIPS Technologies, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/asm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/regdef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define EX(insn,reg,addr,handler)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 9:	insn	reg, addr;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	.section __ex_table,"a";			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	PTR	9b, handler;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	.previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * Returns: -EFAULT if exception before terminator, N if the entire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * buffer filled, else strlen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * Ugly special case have to check: we might get passed a user space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * pointer which wraps into the kernel space.  We don't deal with that.	 If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * it happens at most some bytes of the exceptions handlers will be copied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	.macro __BUILD_STRNCPY_ASM func
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) LEAF(__strncpy_from_\func\()_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	LONG_L		v0, TI_ADDR_LIMIT($28)	# pointer ok?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	and		v0, a1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	bnez		v0, .Lfault\@
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	move		t0, zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	move		v1, a1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) .ifeqs "\func","kernel"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 1:	EX(lbu, v0, (v1), .Lfault\@)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) .else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 1:	EX(lbue, v0, (v1), .Lfault\@)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	PTR_ADDIU	v1, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	R10KCBARRIER(0(ra))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	sb		v0, (a0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	beqz		v0, 2f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	PTR_ADDIU	t0, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	PTR_ADDIU	a0, 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	bne		t0, a2, 1b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 2:	PTR_ADDU	v0, a1, t0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	xor		v0, a1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	bltz		v0, .Lfault\@
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	move		v0, t0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	jr		ra			# return n
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	END(__strncpy_from_\func\()_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) .Lfault\@:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	li		v0, -EFAULT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	jr		ra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.section	__ex_table,"a"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	PTR		1b, .Lfault\@
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.previous
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	.endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #ifndef CONFIG_EVA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	/* Set aliases */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	.global __strncpy_from_user_asm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	.set __strncpy_from_user_asm, __strncpy_from_kernel_asm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) EXPORT_SYMBOL(__strncpy_from_user_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) __BUILD_STRNCPY_ASM kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) EXPORT_SYMBOL(__strncpy_from_kernel_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #ifdef CONFIG_EVA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	.set push
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	.set eva
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __BUILD_STRNCPY_ASM user
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	.set pop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) EXPORT_SYMBOL(__strncpy_from_user_asm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #endif