1*5c810cedSChristophe Leroy // SPDX-License-Identifier: GPL-2.0 2*5c810cedSChristophe Leroy #include <linux/memory.h> 3*5c810cedSChristophe Leroy #include <linux/static_call.h> 4*5c810cedSChristophe Leroy 5*5c810cedSChristophe Leroy #include <asm/code-patching.h> 6*5c810cedSChristophe Leroy 7*5c810cedSChristophe Leroy void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) 8*5c810cedSChristophe Leroy { 9*5c810cedSChristophe Leroy int err; 10*5c810cedSChristophe Leroy bool is_ret0 = (func == __static_call_return0); 11*5c810cedSChristophe Leroy unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func); 12*5c810cedSChristophe Leroy bool is_short = is_offset_in_branch_range((long)target - (long)tramp); 13*5c810cedSChristophe Leroy 14*5c810cedSChristophe Leroy if (!tramp) 15*5c810cedSChristophe Leroy return; 16*5c810cedSChristophe Leroy 17*5c810cedSChristophe Leroy mutex_lock(&text_mutex); 18*5c810cedSChristophe Leroy 19*5c810cedSChristophe Leroy if (func && !is_short) { 20*5c810cedSChristophe Leroy err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target)); 21*5c810cedSChristophe Leroy if (err) 22*5c810cedSChristophe Leroy goto out; 23*5c810cedSChristophe Leroy } 24*5c810cedSChristophe Leroy 25*5c810cedSChristophe Leroy if (!func) 26*5c810cedSChristophe Leroy err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR())); 27*5c810cedSChristophe Leroy else if (is_short) 28*5c810cedSChristophe Leroy err = patch_branch(tramp, target, 0); 29*5c810cedSChristophe Leroy else 30*5c810cedSChristophe Leroy err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP())); 31*5c810cedSChristophe Leroy out: 32*5c810cedSChristophe Leroy mutex_unlock(&text_mutex); 33*5c810cedSChristophe Leroy 34*5c810cedSChristophe Leroy if (err) 35*5c810cedSChristophe Leroy panic("%s: patching failed %pS at %pS\n", __func__, func, tramp); 36*5c810cedSChristophe Leroy } 37*5c810cedSChristophe Leroy EXPORT_SYMBOL_GPL(arch_static_call_transform); 38