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// SPDX-License-Identifier: GPL-2.0
#include <linux/static_call.h>
#include <linux/memory.h>
#include <linux/bug.h>
#include <asm/text-patching.h>
static void __static_call_transform(void *insn, u8 opcode, void *func)
{
const void *code = text_gen_insn(opcode, insn, func);
if (WARN_ONCE(*(u8 *)insn != opcode,
"unexpected static call insn opcode 0x%x at %pS\n",
opcode, insn))
return;
if (memcmp(insn, code, CALL_INSN_SIZE) == 0)
return;
text_poke_bp(insn, code, CALL_INSN_SIZE, NULL);
}
void arch_static_call_transform(void *site, void *tramp, void *func)
{
mutex_lock(&text_mutex);
if (tramp)
__static_call_transform(tramp, JMP32_INSN_OPCODE, func);
if (IS_ENABLED(CONFIG_HAVE_STATIC_CALL_INLINE) && site)
__static_call_transform(site, CALL_INSN_OPCODE, func);
mutex_unlock(&text_mutex);
}
EXPORT_SYMBOL_GPL(arch_static_call_transform);
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