diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2008-06-24 11:32:21 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-07-01 11:28:18 +1000 |
| commit | aaddd3eacaeaef3503035750b3f21ac2bfe97cbf (patch) | |
| tree | 2bac0bedc2185edec916679d218e1c8b89276453 /arch/powerpc/lib | |
| parent | 73f38fe1b563a9d23ffacbda7b51decf41b0c49c (diff) | |
| download | kernel_samsung_crespo-aaddd3eacaeaef3503035750b3f21ac2bfe97cbf.zip kernel_samsung_crespo-aaddd3eacaeaef3503035750b3f21ac2bfe97cbf.tar.gz kernel_samsung_crespo-aaddd3eacaeaef3503035750b3f21ac2bfe97cbf.tar.bz2 | |
powerpc: Move code patching code into arch/powerpc/lib/code-patching.c
We currently have a few routines for patching code in asm/system.h, because
they didn't fit anywhere else. I'd like to clean them up a little and add
some more, so first move them into a dedicated C file - they don't need to
be inlined.
While we're moving the code, drop create_function_call(), it's intended
caller never got merged and will be replaced in future with something
different.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/lib')
| -rw-r--r-- | arch/powerpc/lib/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index e522b06..e7f7042 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -24,3 +24,5 @@ obj-$(CONFIG_SMP) += locks.o endif obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o + +obj-y += code-patching.o diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c new file mode 100644 index 0000000..7afae88 --- /dev/null +++ b/arch/powerpc/lib/code-patching.c @@ -0,0 +1,33 @@ +/* + * Copyright 2008 Michael Ellerman, IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <asm/code-patching.h> + + +void create_instruction(unsigned long addr, unsigned int instr) +{ + unsigned int *p; + p = (unsigned int *)addr; + *p = instr; + asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p)); +} + +void create_branch(unsigned long addr, unsigned long target, int flags) +{ + unsigned int instruction; + + if (! (flags & BRANCH_ABSOLUTE)) + target = target - addr; + + /* Mask out the flags and target, so they don't step on each other. */ + instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC); + + create_instruction(addr, instruction); +} |