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authorRusty Russell <rusty@rustcorp.com.au>2014-03-18 08:05:28 +0100
committerAnton Blanchard <anton@samba.org>2014-04-23 02:05:27 +0200
commit0e60e46e2aa318c92bb224de29b68b6296bb0fde (patch)
tree1926de7c2f97e1ec77b5abefee9a21c1948dcb20 /arch/powerpc/kernel/module_64.c
parentpowerpc: Fix ABIv2 issue with dereference_function_descriptor (diff)
downloadlinux-0e60e46e2aa318c92bb224de29b68b6296bb0fde.tar.xz
linux-0e60e46e2aa318c92bb224de29b68b6296bb0fde.zip
powerpc: make module stub code endian independent
By representing them as words, rather than chars, we can avoid endian ifdefs. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'arch/powerpc/kernel/module_64.c')
-rw-r--r--arch/powerpc/kernel/module_64.c42
1 files changed, 11 insertions, 31 deletions
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 12664c130d73..7c16b2eefd95 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -47,8 +47,8 @@
struct ppc64_stub_entry
{
/* 28 byte jump instruction sequence (7 instructions) */
- unsigned char jump[28];
- unsigned char unused[4];
+ u32 jump[7];
+ u32 unused;
/* Data for the above code */
struct ppc64_opd_entry opd;
};
@@ -61,25 +61,14 @@ 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> */
+ 0x3d820000, /* addis r12,r2, <high> */
+ 0x398c0000, /* 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. */
- 0xf8, 0x41, 0x00, 0x28, /* std r2,40(r1) */
- 0xe9, 0x6c, 0x00, 0x20, /* ld r11,32(r12) */
- 0xe8, 0x4c, 0x00, 0x28, /* ld r2,40(r12) */
- 0x7d, 0x69, 0x03, 0xa6, /* mtctr r11 */
- 0x4e, 0x80, 0x04, 0x20 /* bctr */
-#endif
+ 0xf8410028, /* std r2,40(r1) */
+ 0xe96c0020, /* ld r11,32(r12) */
+ 0xe84c0028, /* ld r2,40(r12) */
+ 0x7d6903a6, /* mtctr r11 */
+ 0x4e800420 /* bctr */
} };
/* Count how many different 24-bit relocations (different symbol,
@@ -274,19 +263,10 @@ static inline int create_stub(Elf64_Shdr *sechdrs,
struct ppc64_opd_entry *opd,
struct module *me)
{
- Elf64_Half *loc1, *loc2;
long reladdr;
*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);
if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
@@ -296,8 +276,8 @@ static inline int create_stub(Elf64_Shdr *sechdrs,
}
DEBUGP("Stub %p get data from reladdr %li\n", entry, reladdr);
- *loc1 = PPC_HA(reladdr);
- *loc2 = PPC_LO(reladdr);
+ entry->jump[0] |= PPC_HA(reladdr);
+ entry->jump[1] |= PPC_LO(reladdr);
entry->opd.funcaddr = opd->funcaddr;
entry->opd.r2 = opd->r2;
return 1;