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powerpc: Add PPC_NOP_INSTR, a hash define for the preferred nop instruction 

A bunch of code has hard-coded the value for a "nop" instruction, it
would be nice to have a #define for it.

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>
This commit is contained in:
Michael Ellerman 2008-06-24 11:32:35 +10:00 committed by Paul Mackerras
parent ae0dc73625
commit b7bcda631e
4 changed files with 7 additions and 3 deletions
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3
arch/powerpc/kernel/cputable.c
View File

@ -17,6 +17,7 @@
#include <linux/module.h>
#include <asm/oprofile_impl.h>
#include <asm/code-patching.h>
#include <asm/cputable.h>
#include <asm/prom.h> /* for PTRRELOC on ARCH=ppc */
@ -1663,7 +1664,7 @@ void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
pend = ((unsigned int *)fcur) + (fcur->end_off / 4);
for (p = pstart; p < pend; p++) {
*p = 0x60000000u;
*p = PPC_NOP_INSTR;
asm volatile ("dcbst 0, %0" : : "r" (p));
}
asm volatile ("sync" : : : "memory");

2
arch/powerpc/kernel/crash_dump.c
View File

@ -44,7 +44,7 @@ static void __init create_trampoline(unsigned long addr)
* branch to "addr" we jump to ("addr" + 32 MB). Although it requires
* two instructions it doesn't require any registers.
*/
patch_instruction(p, 0x60000000); /* nop */
patch_instruction(p, PPC_NOP_INSTR);
patch_branch(++p, addr + PHYSICAL_START, 0);
}

3
arch/powerpc/kernel/module_64.c
View File

@ -24,6 +24,7 @@
#include <asm/module.h>
#include <asm/uaccess.h>
#include <asm/firmware.h>
#include <asm/code-patching.h>
#include <linux/sort.h>
#include "setup.h"
@ -330,7 +331,7 @@ static unsigned long stub_for_addr(Elf64_Shdr *sechdrs,
restore r2. */
static int restore_r2(u32 *instruction, struct module *me)
{
if (*instruction != 0x60000000) {
if (*instruction != PPC_NOP_INSTR) {
printk("%s: Expect noop after relocate, got %08x\n",
me->name, *instruction);
return 0;

2
include/asm-powerpc/code-patching.h
View File

@ -12,6 +12,8 @@
#include <asm/types.h>
#define PPC_NOP_INSTR 0x60000000
/* Flags for create_branch:
* "b" == create_branch(addr, target, 0);
* "ba" == create_branch(addr, target, BRANCH_ABSOLUTE);