1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/memory.h> 3 #include <linux/static_call.h> 4 5 #include <asm/code-patching.h> 6 7 void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) 8 { 9 int err; 10 bool is_ret0 = (func == __static_call_return0); 11 unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func); 12 bool is_short = is_offset_in_branch_range((long)target - (long)tramp); 13 14 if (!tramp) 15 return; 16 17 mutex_lock(&text_mutex); 18 19 if (func && !is_short) { 20 err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target)); 21 if (err) 22 goto out; 23 } 24 25 if (!func) 26 err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR())); 27 else if (is_short) 28 err = patch_branch(tramp, target, 0); 29 else 30 err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP())); 31 out: 32 mutex_unlock(&text_mutex); 33 34 if (err) 35 panic("%s: patching failed %pS at %pS\n", __func__, func, tramp); 36 } 37 EXPORT_SYMBOL_GPL(arch_static_call_transform); 38