csky: Add EM_CSKY for ldso

Support EM_CSKY 252 elf format.

Changelog:
Increase EM_NUM to 253

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Signed-off-by: Mao Han <han_mao@c-sky.com>

include/elf.h

@@ -271,9 +271,10 @@ typedef struct
 #define EM_AARCH64	183		/* ARM AARCH64 */
 #define EM_MICROBLAZE	189		/* Xilinx Microblaze */
 #define EM_ARCV2	195		/* ARCv2 Cores */
+#define EM_CSKY		252		/* C-SKY Cores */
 
 /* NEXT FREE NUMBER: Increment this after adding your official arch number */
-#define EM_NUM		196
+#define EM_NUM		253
 
 /* If it is necessary to assign new unofficial EM_* values, please pick large
    random numbers (0x8523, 0xa7f2, etc.) to minimize the chances of collision

ldso/ldso/csky/dl-sysdep.h

@@ -18,7 +18,7 @@ do {                                                        \
 
 /* Here we define the magic numbers that this dynamic loader should accept */
 #define MAGIC1 EM_MCORE
-#undef  MAGIC2
+#define MAGIC2 EM_CSKY
 
 /* Used for error messages */
 #define ELF_TARGET "csky"