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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ARM_JUMP_LABEL_H
#define _ASM_ARM_JUMP_LABEL_H
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <asm/unified.h>
#define JUMP_LABEL_NOP_SIZE 4
/* This macro is also expanded on the Rust side. */
#define ARCH_STATIC_BRANCH_ASM(key, label) \
"1:\n\t" \
WASM(nop) "\n\t" \
".pushsection __jump_table, \"aw\"\n\t" \
".word 1b, " label ", " key "\n\t" \
".popsection\n\t" \
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
: : "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 goto("1:\n\t"
WASM(b) " %l[l_yes]\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".word 1b, %l[l_yes], %c0\n\t"
".popsection\n\t"
: : "i" (&((char *)key)[branch]) : : l_yes);
return false;
l_yes:
return true;
}
typedef u32 jump_label_t;
struct jump_entry {
jump_label_t code;
jump_label_t target;
jump_label_t key;
};
#endif /* __ASSEMBLY__ */
#endif
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