kernel/trace/ftrace_64_pg.c

32  * We generally only have a single long_branch tramp and at most 2 or 3 plt
123 	unsigned long entry, ptr, tramp;
140 	tramp = find_bl_target(ip, op);
142 	pr_devel("ip:%lx jumps to %lx", ip, tramp);
144 	if (module_trampoline_target(mod, tramp, &ptr)) {
193 	 * bl <tramp>
239 static int add_ftrace_tramp(unsigned long tramp)
245 			ftrace_tramps[i] = tramp;
258 static int setup_mcount_compiler_tramp(unsigned long tramp)
264 	/* Is this a known long jump tramp? */
266 		if (ftrace_tramps[i] == tramp)
270 	if (copy_inst_from_kernel_nofault(&op, (void *)tramp)) {
277 		pr_debug("Trampoline is not a long branch tramp.\n");
282 	ptr = find_bl_target(tramp, op);
289 	/* Let's re-write the tramp to go to ftrace_[regs_]caller */
295 	if (patch_branch((u32 *)tramp, ptr, 0)) {
300 	if (add_ftrace_tramp(tramp)) {
301 		pr_debug("No tramp locations left\n");
310 	unsigned long tramp, ip = rec->ip;
326 	tramp = find_bl_target(ip, op);
328 	pr_devel("ip:%lx jumps to %lx", ip, tramp);
330 	if (setup_mcount_compiler_tramp(tramp)) {
413 	unsigned long entry, ptr, tramp;
431 	if (!mod->arch.tramp ||
438 		tramp = mod->arch.tramp_regs;
440 		tramp = mod->arch.tramp;
442 	if (module_trampoline_target(mod, tramp, &ptr)) {
456 	if (patch_branch(ip, tramp, BRANCH_SET_LINK)) {
474 	unsigned long tramp, entry, ptr;
500 	tramp = find_ftrace_tramp((unsigned long)ip);
501 	if (!tramp) {
506 	if (patch_branch(ip, tramp, BRANCH_SET_LINK)) {
507 		pr_err("Error patching branch to ftrace tramp!\n");
557 	unsigned long entry, ptr, tramp;
561 	if (!mod->arch.tramp || !mod->arch.tramp_regs) {
579 	tramp = find_bl_target(ip, op);
582 	pr_devel("ip:%lx jumps to %lx", ip, tramp);
584 	if (tramp != entry) {
586 		if (module_trampoline_target(mod, tramp, &ptr)) {
612 		tramp = mod->arch.tramp_regs;
614 		tramp = mod->arch.tramp;
616 	if (module_trampoline_target(mod, tramp, &ptr)) {
630 	if (patch_branch((u32 *)ip, tramp, BRANCH_SET_LINK)) {
732 	unsigned int *tramp[] = { ftrace_tramp_text, ftrace_tramp_init };
757 		memcpy(tramp[i], stub_insns, sizeof(stub_insns));
758 		tramp[i][1] |= PPC_HA(reladdr);
759 		tramp[i][2] |= PPC_LO(reladdr);
760 		add_ftrace_tramp((unsigned long)tramp[i]);