// SPDX-License-Identifier: GPL-2.0 #include <linux/static_call.h> #include <linux/memory.h> #include <asm/text-patching.h> #include <asm/insn.h> void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) { u64 literal; int ret; if (!func) func = __static_call_return0; /* decode the instructions to discover the literal address */ literal = ALIGN_DOWN((u64)tramp + 4, SZ_4K) + aarch64_insn_adrp_get_offset(le32_to_cpup(tramp + 4)) + 8 * aarch64_insn_decode_immediate(AARCH64_INSN_IMM_12, le32_to_cpup(tramp + 8)); ret = aarch64_insn_write_literal_u64((void *)literal, (u64)func); WARN_ON_ONCE(ret); } EXPORT_SYMBOL_GPL(arch_static_call_transform);