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Commit b3c3025b authored by Markos Chandras's avatar Markos Chandras Committed by Ralf Baechle
Browse files

MIPS: lib: strncpy_user: Add EVA support 



In non-EVA mode, strncpy_from_user* aliases are used for the
strncpy_from_kernel* symbols since the code is identical. In EVA
mode, new strcpy_from_user* symbols are used which use the EVA
specific instructions to load values from userspace.

Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent cc59fe5b

arch/mips/kernel/mips_ksyms.c

+6 −0
Original line number Diff line number Diff line
@@ -16,6 +16,10 @@ 
#include <asm/ftrace.h>



extern void *__bzero(void *__s, size_t __count);

extern long __strncpy_from_kernel_nocheck_asm(char *__to,

					      const char *__from, long __len);

extern long __strncpy_from_kernel_asm(char *__to, const char *__from,

				      long __len);

extern long __strncpy_from_user_nocheck_asm(char *__to,

					    const char *__from, long __len);

extern long __strncpy_from_user_asm(char *__to, const char *__from,
@@ -48,6 +52,8 @@ EXPORT_SYMBOL(copy_page); 
EXPORT_SYMBOL(__copy_user);

EXPORT_SYMBOL(__copy_user_inatomic);

EXPORT_SYMBOL(__bzero);

EXPORT_SYMBOL(__strncpy_from_kernel_nocheck_asm);

EXPORT_SYMBOL(__strncpy_from_kernel_asm);

EXPORT_SYMBOL(__strncpy_from_user_nocheck_asm);

EXPORT_SYMBOL(__strncpy_from_user_asm);

EXPORT_SYMBOL(__strlen_kernel_nocheck_asm);

arch/mips/lib/strncpy_user.S

+19 −0
Original line number Diff line number Diff line
@@ -38,7 +38,11 @@ FEXPORT(__strncpy_from_\func\()_nocheck_asm) 
	.set		noreorder

	move		t0, zero

	move		v1, a1

.ifeqs "\func","kernel"

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

.else

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

.endif

	PTR_ADDIU	v1, 1

	R10KCBARRIER(0(ra))

	beqz		v0, 2f
@@ -63,4 +67,19 @@ FEXPORT(__strncpy_from_\func\()_nocheck_asm) 


	.endm



#ifndef CONFIG_EVA

	/* Set aliases */

	.global __strncpy_from_user_asm

	.global __strncpy_from_user_nocheck_asm

	.set __strncpy_from_user_asm, __strncpy_from_kernel_asm

	.set __strncpy_from_user_nocheck_asm, __strncpy_from_kernel_nocheck_asm

#endif



__BUILD_STRNCPY_ASM kernel



#ifdef CONFIG_EVA

	.set push

	.set eva

__BUILD_STRNCPY_ASM user

	.set pop

#endif