Commit a72a70a4 authored by Mao Minkai's avatar Mao Minkai Committed by guzitao
Browse files

sw64: add jump_label support 

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8Y8CY



--------------------------------

Add jump_label support for SW64.

Signed-off-by: default avatarMao Minkai <maominkai@wxiat.com>
Reviewed-by: default avatarHe Sheng <hesheng@wxiat.com>
Signed-off-by: default avatarGu Zitao <guzitao@wxiat.com>
parent 4b0906fc

arch/sw_64/include/asm/jump_label.h

0 → 100644
+50 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */



#ifndef _ASM_SW64_JUMP_LABEL_H

#define _ASM_SW64_JUMP_LABEL_H



#ifndef __ASSEMBLY__



#include <linux/types.h>

#include <asm/insn.h>



#define JUMP_LABEL_NOP_SIZE		SW64_INSN_SIZE



static __always_inline bool arch_static_branch(struct static_key *key, bool branch)

{

	asm_volatile_goto("1: nop\n\t"

			".pushsection __jump_table,  \"aw\"\n\t"

			".align 3\n\t"

			".quad 1b, %l[l_yes], %0\n\t"

			".popsection\n\t"

			:  :  "i"(&((char *)key)[branch]) :  : l_yes);



	return false;

l_yes:

	return true;

}



static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)

{

	asm_volatile_goto("1: br %l[l_yes]\n\t"

			".pushsection __jump_table,  \"aw\"\n\t"

			".align 3\n\t"

			".quad 1b, %l[l_yes], %0\n\t"

			".popsection\n\t"

			:  :  "i"(&((char *)key)[branch]) :  : l_yes);



	return false;

l_yes:

	return true;

}



typedef u64 jump_label_t;



struct jump_entry {

	jump_label_t code;

	jump_label_t target;

	jump_label_t key;

};



#endif /* __ASSEMBLY__ */

#endif /* _ASM_SW64_JUMP_LABEL_H */

arch/sw_64/kernel/jump_label.c

0 → 100644
+32 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#include <linux/jump_label.h>



#include <asm/bug.h>

#include <asm/cacheflush.h>



void arch_jump_label_transform(struct jump_entry *entry,

			       enum jump_label_type type)

{

	u32 *insnp = (u32 *)entry->code;

	u32 insn;



	if (type == JUMP_LABEL_JMP) {

		insn = sw64_insn_br(R31, (entry->code), entry->target);

		BUG_ON(insn == -1);

	} else {

		insn = sw64_insn_nop();

	}



	*insnp = insn;



	flush_icache_range(entry->code, entry->code + SW64_INSN_SIZE);

}



void arch_jump_label_transform_static(struct jump_entry *entry,

				      enum jump_label_type type)

{

	/*

	 * no need to rewrite NOP

	 */

}