MIPS: lib: strlen_user: Add EVA support

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

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c
index a322db072c3c..742ed7d790a0 100644
--- a/arch/mips/kernel/mips_ksyms.c
+++ b/arch/mips/kernel/mips_ksyms.c
@@ -20,6 +20,8 @@ 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,
                                     long __len);
+extern long __strlen_kernel_nocheck_asm(const char *s);
+extern long __strlen_kernel_asm(const char *s);
 extern long __strlen_user_nocheck_asm(const char *s);
 extern long __strlen_user_asm(const char *s);
 extern long __strnlen_kernel_nocheck_asm(const char *s);
@@ -48,6 +50,8 @@ EXPORT_SYMBOL(__copy_user_inatomic);
 EXPORT_SYMBOL(__bzero);
 EXPORT_SYMBOL(__strncpy_from_user_nocheck_asm);
 EXPORT_SYMBOL(__strncpy_from_user_asm);
+EXPORT_SYMBOL(__strlen_kernel_nocheck_asm);
+EXPORT_SYMBOL(__strlen_kernel_asm);
 EXPORT_SYMBOL(__strlen_user_nocheck_asm);
 EXPORT_SYMBOL(__strlen_user_asm);
 EXPORT_SYMBOL(__strnlen_kernel_nocheck_asm);
diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S
index 6e8bdb373213..bef65c98df59 100644
--- a/arch/mips/lib/strlen_user.S
+++ b/arch/mips/lib/strlen_user.S
@@ -30,7 +30,11 @@ LEAF(__strlen_\func\()_asm)
 
 FEXPORT(__strlen_\func\()_nocheck_asm)
         move            v0, a0
+.ifeqs "\func", "kernel"
 1:      EX(lbu, v1, (v0), .Lfault\@)
+.else
+1:      EX(lbue, v1, (v0), .Lfault\@)
+.endif
         PTR_ADDIU       v0, 1
         bnez            v1, 1b
         PTR_SUBU        v0, a0
@@ -41,4 +45,20 @@ FEXPORT(__strlen_\func\()_nocheck_asm)
         jr              ra
         .endm
 
+#ifndef CONFIG_EVA
+        /* Set aliases */
+        .global __strlen_user_asm
+        .global __strlen_user_nocheck_asm
+        .set __strlen_user_asm, __strlen_kernel_asm
+        .set __strlen_user_nocheck_asm, __strlen_kernel_nocheck_asm
+#endif
+
+__BUILD_STRLEN_ASM kernel
+
+#ifdef CONFIG_EVA
+
+        .set push
+        .set eva
 __BUILD_STRLEN_ASM user
+        .set pop
+#endif