Release 4.14 arch/s390/include/asm/jump_label.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_JUMP_LABEL_H

#define _ASM_S390_JUMP_LABEL_H

#ifndef __ASSEMBLY__

#include <linux/types.h>
#include <linux/stringify.h>


#define JUMP_LABEL_NOP_SIZE 6

#define JUMP_LABEL_NOP_OFFSET 2

/*
 * We use a brcl 0,2 instruction for jump labels at compile time so it
 * can be easily distinguished from a hotpatch generated instruction.
 */


static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("0:     brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
		".pushsection __jump_table, \"aw\"\n"
		".balign 8\n"
		".quad 0b, %l[label], %0\n"
		".popsection\n"
		: : "X" (&((char *)key)[branch]) : : label);

	return false;
label:
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peter Zijlstra
27
48.21%
1
16.67%
Jan Glauber
11
19.64%
1
16.67%
Ingo Molnar
10
17.86%
2
33.33%
Heiko Carstens
8
14.29%
2
33.33%
Total
56
100.00%
6
100.00%



static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
	asm_volatile_goto("0:     brcl 15, %l[label]\n"
		".pushsection __jump_table, \"aw\"\n"
		".balign 8\n"
		".quad 0b, %l[label], %0\n"
		".popsection\n"
		: : "X" (&((char *)key)[branch]) : : label);

	return false;
label:
	return true;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Peter Zijlstra
37
72.55%
1
33.33%
Jan Glauber
8
15.69%
1
33.33%
Ingo Molnar
6
11.76%
1
33.33%
Total
51
100.00%
3
100.00%


typedef unsigned long jump_label_t;


struct jump_entry {
	
jump_label_t code;
	
jump_label_t target;
	
jump_label_t key;
};

#endif  /* __ASSEMBLY__ */
#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Peter Zijlstra
64
41.03%
1
11.11%
Jan Glauber
51
32.69%
1
11.11%
Ingo Molnar
18
11.54%
2
22.22%
Heiko Carstens
13
8.33%
2
22.22%
Anton Blanchard
6
3.85%
1
11.11%
Jason Baron
3
1.92%
1
11.11%
Greg Kroah-Hartman
1
0.64%
1
11.11%
Total
156
100.00%
9
100.00%
Directory: arch/s390/include/asm

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