powerpc: Make kernel module helper endian-safe.

Signed-off-by: Eugene Surovegin <surovegin@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 6ee59a0eb268..a102f4412392 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -62,6 +62,16 @@ struct ppc64_stub_entry
    r2) into the stub. */
 static struct ppc64_stub_entry ppc64_stub =
 { .jump = {
+#ifdef __LITTLE_ENDIAN__
+        0x00, 0x00, 0x82, 0x3d, /* addis   r12,r2, <high> */
+        0x00, 0x00, 0x8c, 0x39, /* addi    r12,r12, <low> */
+        /* Save current r2 value in magic place on the stack. */
+        0x28, 0x00, 0x41, 0xf8, /* std     r2,40(r1) */
+        0x20, 0x00, 0x6c, 0xe9, /* ld      r11,32(r12) */
+        0x28, 0x00, 0x4c, 0xe8, /* ld      r2,40(r12) */
+        0xa6, 0x03, 0x69, 0x7d, /* mtctr   r11 */
+        0x20, 0x04, 0x80, 0x4e  /* bctr */
+#else
         0x3d, 0x82, 0x00, 0x00, /* addis   r12,r2, <high> */
         0x39, 0x8c, 0x00, 0x00, /* addi    r12,r12, <low> */
         /* Save current r2 value in magic place on the stack. */
@@ -70,6 +80,7 @@ static struct ppc64_stub_entry ppc64_stub =
         0xe8, 0x4c, 0x00, 0x28, /* ld      r2,40(r12) */
         0x7d, 0x69, 0x03, 0xa6, /* mtctr   r11 */
         0x4e, 0x80, 0x04, 0x20  /* bctr */
+#endif
 } };
 
 /* Count how many different 24-bit relocations (different symbol,
@@ -269,8 +280,13 @@ static inline int create_stub(Elf64_Shdr *sechdrs,
 
         *entry = ppc64_stub;
 
+#ifdef __LITTLE_ENDIAN__
+        loc1 = (Elf64_Half *)&entry->jump[0];
+        loc2 = (Elf64_Half *)&entry->jump[4];
+#else
         loc1 = (Elf64_Half *)&entry->jump[2];
         loc2 = (Elf64_Half *)&entry->jump[6];
+#endif
 
         /* Stub uses address relative to r2. */
         reladdr = (unsigned long)entry - my_r2(sechdrs, me);