code-patching.c (aaddd3eacaeaef3503035750b3f21ac2bfe97cbf) code-patching.c (e7a57273c6407bb6903fbaddec8c2119bf318617)
1/*
2 * Copyright 2008 Michael Ellerman, IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <asm/code-patching.h>
12
13
1/*
2 * Copyright 2008 Michael Ellerman, IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <asm/code-patching.h>
12
13
14void create_instruction(unsigned long addr, unsigned int instr)
14void patch_instruction(unsigned int *addr, unsigned int instr)
15{
15{
16 unsigned int *p;
17 p = (unsigned int *)addr;
18 *p = instr;
19 asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p));
16 *addr = instr;
17 asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (addr));
20}
21
18}
19
22void create_branch(unsigned long addr, unsigned long target, int flags)
20void patch_branch(unsigned int *addr, unsigned long target, int flags)
23{
21{
22 patch_instruction(addr, create_branch(addr, target, flags));
23}
24
25unsigned int create_branch(const unsigned int *addr,
26 unsigned long target, int flags)
27{
24 unsigned int instruction;
25
26 if (! (flags & BRANCH_ABSOLUTE))
28 unsigned int instruction;
29
30 if (! (flags & BRANCH_ABSOLUTE))
27 target = target - addr;
31 target = target - (unsigned long)addr;
28
29 /* Mask out the flags and target, so they don't step on each other. */
30 instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
31
32
33 /* Mask out the flags and target, so they don't step on each other. */
34 instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC);
35
32 create_instruction(addr, instruction);
36 return instruction;
33}
37}