linux-toradex.git/arch/powerpc/kernel/module_64.c, branch v4.3-rc2

powerpc: Use pr_fmt in module loader code

2014-10-02T07:33:54+00:00

Use pr_fmt to give some context to the error messages in the
module code, and convert open coded debug printk to pr_debug.

Use pr_err for error messages.

Signed-off-by: Anton Blanchard 
Signed-off-by: Michael Ellerman

powerpc/module: Fix TOC symbol CRC

2014-06-25T03:10:48+00:00

The commit 71ec7c55ed91 introduced the magic symbol ".TOC." for ELFv2 ABI.
This symbol is built manually and has no CRC value computed. A zero value
is put in the CRC section to avoid modpost complaining about a missing CRC.
Unfortunately, this breaks the kernel module loading when the kernel is
relocated (kdump case for instance) because of the relocation applied to
the kcrctab values.

This patch compute a CRC value for the TOC symbol which will match the one
compute by the kernel when it is relocated - aka '0 - relocate_start' done in
maybe_relocated called by check_version (module.c).

Signed-off-by: Laurent Dufour 
Cc: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

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