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: Markos Chandras <markos.chandras@imgtec.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/arch/mips/kernel/mips_ksyms.c b/arch/mips/kernel/mips_ksyms.c
index 742ed7d790a0..675bd0578d3f 100644
--- a/arch/mips/kernel/mips_ksyms.c
+++ b/arch/mips/kernel/mips_ksyms.c
@@ -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);
diff --git a/arch/mips/lib/strncpy_user.S b/arch/mips/lib/strncpy_user.S
index 51b38ab1478a..d3301cd1e9a5 100644
--- a/arch/mips/lib/strncpy_user.S
+++ b/arch/mips/lib/strncpy_user.S
@@ -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