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Michael Ellerman
authored and
Paul Mackerras
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Jul 1, 2008
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@@ -1,2 +1,2 @@ | ||
--- | ||
refs/heads/master: 73f38fe1b563a9d23ffacbda7b51decf41b0c49c | ||
refs/heads/master: aaddd3eacaeaef3503035750b3f21ac2bfe97cbf |
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@@ -24,3 +24,5 @@ obj-$(CONFIG_SMP) += locks.o | |
endif | ||
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obj-$(CONFIG_PPC_LIB_RHEAP) += rheap.o | ||
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obj-y += code-patching.o |
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/* | ||
* 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. | ||
*/ | ||
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#include <linux/kernel.h> | ||
#include <asm/code-patching.h> | ||
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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)); | ||
} | ||
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void create_branch(unsigned long addr, unsigned long target, int flags) | ||
{ | ||
unsigned int instruction; | ||
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if (! (flags & BRANCH_ABSOLUTE)) | ||
target = target - addr; | ||
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/* Mask out the flags and target, so they don't step on each other. */ | ||
instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC); | ||
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create_instruction(addr, instruction); | ||
} |
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#ifndef _ASM_POWERPC_CODE_PATCHING_H | ||
#define _ASM_POWERPC_CODE_PATCHING_H | ||
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/* | ||
* 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. | ||
*/ | ||
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/* Flags for create_branch: | ||
* "b" == create_branch(addr, target, 0); | ||
* "ba" == create_branch(addr, target, BRANCH_ABSOLUTE); | ||
* "bl" == create_branch(addr, target, BRANCH_SET_LINK); | ||
* "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK); | ||
*/ | ||
#define BRANCH_SET_LINK 0x1 | ||
#define BRANCH_ABSOLUTE 0x2 | ||
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extern void create_branch(unsigned long addr, unsigned long target, int flags); | ||
extern void create_instruction(unsigned long addr, unsigned int instr); | ||
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#endif /* _ASM_POWERPC_CODE_PATCHING_H */ |
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