[PATCH] kbuild: fix modpost segfault for 64bit mipsel kernel

Here is an updated r_info layout fix.  Please apply "check SHT_REL
sections" patch before this.

64bit mips has different r_info layout.  This patch fixes modpost
segfault for 64bit little endian mips kernel.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 19 insertions, 2 deletions

diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 086fa466504c..861d866fcd83 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -41,6 +41,25 @@
 #define ELF_R_TYPE  ELF64_R_TYPE
 #endif
 
+/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
+typedef struct
+{
+        Elf32_Word    r_sym;    /* Symbol index */
+        unsigned char r_ssym;   /* Special symbol for 2nd relocation */
+        unsigned char r_type3;  /* 3rd relocation type */
+        unsigned char r_type2;  /* 2nd relocation type */
+        unsigned char r_type1;  /* 1st relocation type */
+} _Elf64_Mips_R_Info;
+
+typedef union
+{
+        Elf64_Xword             r_info_number;
+        _Elf64_Mips_R_Info      r_info_fields;
+} _Elf64_Mips_R_Info_union;
+
+#define ELF64_MIPS_R_SYM(i) \
+  ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
+
 #if KERNEL_ELFDATA != HOST_ELFDATA
 
 static inline void __endian(const void *src, void *dest, unsigned int size)
@@ -50,8 +69,6 @@ static inline void __endian(const void *src, void *dest, unsigned int size)
                 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
 }
 
-
-
 #define TO_NATIVE(x)                                            \
 ({                                                              \
         typeof(x) __x;                                          \