55 строки
1.3 KiB
C
55 строки
1.3 KiB
C
|
/*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*
|
||
|
|
* Copyright (c) 2010 Cavium Networks, Inc.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/jump_label.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/memory.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/cpu.h>
|
||
|
|
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
#include <asm/inst.h>
|
||
|
|
|
||
|
|
#ifdef HAVE_JUMP_LABEL
|
||
|
|
|
||
|
|
#define J_RANGE_MASK ((1ul << 28) - 1)
|
||
|
|
|
||
|
|
void arch_jump_label_transform(struct jump_entry *e,
|
||
|
|
enum jump_label_type type)
|
||
|
|
{
|
||
|
|
union mips_instruction insn;
|
||
|
|
union mips_instruction *insn_p =
|
||
|
|
(union mips_instruction *)(unsigned long)e->code;
|
||
|
|
|
||
|
|
/* Jump only works within a 256MB aligned region. */
|
||
|
|
BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK));
|
||
|
|
|
||
|
|
/* Target must have 4 byte alignment. */
|
||
|
|
BUG_ON((e->target & 3) != 0);
|
||
|
|
|
||
|
|
if (type == JUMP_LABEL_ENABLE) {
|
||
|
|
insn.j_format.opcode = j_op;
|
||
|
|
insn.j_format.target = (e->target & J_RANGE_MASK) >> 2;
|
||
|
|
} else {
|
||
|
|
insn.word = 0; /* nop */
|
||
|
|
}
|
||
|
|
|
||
|
|
get_online_cpus();
|
||
|
|
mutex_lock(&text_mutex);
|
||
|
|
*insn_p = insn;
|
||
|
|
|
||
|
|
flush_icache_range((unsigned long)insn_p,
|
||
|
|
(unsigned long)insn_p + sizeof(*insn_p));
|
||
|
|
|
||
|
|
mutex_unlock(&text_mutex);
|
||
|
|
put_online_cpus();
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAVE_JUMP_LABEL */
|