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Commit cc59fe5b authored by Markos Chandras's avatar Markos Chandras Committed by Ralf Baechle
Browse files

MIPS: lib: strncpy_user: Use macro to build the strncpy_from_user symbol 



Build the __strncpy_from_user symbol using a macro. In EVA mode we will
need to use similar code to do the userspace load operations so
it is better if we use a macro to avoid code duplications.

Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent 05397054

arch/mips/lib/strncpy_user.S

+13 −8
Original line number Diff line number Diff line
@@ -28,16 +28,17 @@ 
 * it happens at most some bytes of the exceptions handlers will be copied.

 */



LEAF(__strncpy_from_user_asm)

	.macro __BUILD_STRNCPY_ASM func

LEAF(__strncpy_from_\func\()_asm)

	LONG_L		v0, TI_ADDR_LIMIT($28)	# pointer ok?

	and		v0, a1

	bnez		v0, .Lfault

	bnez		v0, .Lfault\@



FEXPORT(__strncpy_from_user_nocheck_asm)

FEXPORT(__strncpy_from_\func\()_nocheck_asm)

	.set		noreorder

	move		t0, zero

	move		v1, a1

1:	EX(lbu, v0, (v1), .Lfault)

1:	EX(lbu, v0, (v1), .Lfault\@)

	PTR_ADDIU	v1, 1

	R10KCBARRIER(0(ra))

	beqz		v0, 2f
@@ -47,15 +48,19 @@ FEXPORT(__strncpy_from_user_nocheck_asm) 
	 PTR_ADDIU	a0, 1

2:	PTR_ADDU	v0, a1, t0

	xor		v0, a1

	bltz		v0, .Lfault

	bltz		v0, .Lfault\@

	 nop

	jr		ra			# return n

	 move		v0, t0

	END(__strncpy_from_user_asm)

	END(__strncpy_from_\func\()_asm)



.Lfault: jr		ra

.Lfault\@: jr		ra

	  li		v0, -EFAULT



	.section	__ex_table,"a"

	PTR		1b, .Lfault

	PTR		1b, .Lfault\@

	.previous



	.endm



__BUILD_STRNCPY_ASM user