linux.git/arch/powerpc/kernel/module_64.c, branch v3.16-rc2

powerpc/module: Fix stubs for BE

2014-05-20T00:56:01+00:00

A simple patch which was supposed to swap r12 and r11 also
inexplicably changed the offset by two bytes.  This instruction
(to load r2) isn't used in LE, so it wasn't noticed.

Fixes: b1ce369e82 ("powerpc: modules: use r12 for stub jump address.)
Reported-by: Alistair Popple 
Signed-off-by: Rusty Russell 
Tested-by: Alistair Popple 
Signed-off-by: Benjamin Herrenschmidt

powerpc/modules: Create module_trampoline_target()

2014-04-23T00:05:34+00:00

ftrace has way too much knowledge of our kernel module trampoline
layout hidden inside it. Create module_trampoline_target() that gives
the target address of a kernel module trampoline.

Signed-off-by: Anton Blanchard

powerpc/modules: Create is_module_trampoline()

2014-04-23T00:05:34+00:00

ftrace has way too much knowledge of our kernel module trampoline
layout hidden inside it. Create is_module_trampoline() that can
abstract this away inside the module loader code.

Signed-off-by: Anton Blanchard

powerpc: modules: implement stubs for ELFv2 ABI.

2014-04-23T00:05:32+00:00

ELFv2 doesn't use function descriptors, because it doesn't need to
load a new r2 when calling into a function.  On the other hand, you're
supposed to use a local entry point for R_PPC_REL24 branches.

Signed-off-by: Rusty Russell

powerpc: modules: skip r2 setup for ELFv2

2014-04-23T00:05:31+00:00

ELFv2 doesn't need to set up r2 when calling a function.

Signed-off-by: Rusty Russell

powerpc: modules: use r12 for stub jump address.

2014-04-23T00:05:31+00:00

In ELFv2, r12 is supposed to equal to PC on entry to a function.
Our stubs use r11, so change swap that with r12.

Signed-off-by: Rusty Russell

powerpc: modules: change r2 save/restore offset for ELFv2 ABI.

2014-04-23T00:05:30+00:00

ELFv2 uses a different stack offset (24 vs 40) to save r2.

Signed-off-by: Rusty Russell

powerpc: modules: comment about de-dotifying symbols when using the ELFv2 ABI.

2014-04-23T00:05:30+00:00

ELFv2 doesn't use function descriptors, so we don't expect symbols to
start with ".".  But because depmod and modpost strip ".", and we have
the special symbol ".TOC.", we still need to do it.

Signed-off-by: Rusty Russell

powerpc: Handle new ELFv2 module relocations

2014-04-23T00:05:29+00:00

The new ELF ABI tends to use R_PPC64_REL16_LO and R_PPC64_REL16_HA
relocations (PC-relative), so implement them.

Signed-off-by: Rusty Russell

powerpc: Fix up TOC. for modules.

2014-04-23T00:05:29+00:00

The kernel resolved the '.TOC.' to a fake symbol, so we need to fix it up
to point to our .toc section plus 0x8000.

Signed-off-by: Rusty Russell