1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
21  * Gcc-csky with -pg will insert stub in function prologue:
27  * If the (callee - current_pc) is less then 64MB, we'll use bsr:
38  * (r26 is our reserved link-reg)
44 	long offset;  in make_jbsr()  local
48 	offset = (long) callee - (long) pc;  in make_jbsr()
50 	if (unlikely(offset < -67108864 || offset > 67108864)) {  in make_jbsr()
58 		offset = offset >> 1;  in make_jbsr()
61 			 ((uint16_t)((unsigned long) offset >> 16) & 0x3ff);  in make_jbsr()
62 		call[2] = (uint16_t)((unsigned long) offset & 0xffff);  in make_jbsr()
73 	unsigned long hook_pos = hook - 2;  in ftrace_check_current_nop()
77 		return -EFAULT;  in ftrace_check_current_nop()
85 		return -EINVAL;  in ftrace_check_current_nop()
96 	unsigned long hook_pos = hook - 2;  in ftrace_modify_code()
104 		return -EPERM;  in ftrace_modify_code()
113 	int ret = ftrace_check_current_nop(rec->ip);  in ftrace_make_call()
118 	return ftrace_modify_code(rec->ip, addr, true, false);  in ftrace_make_call()
124 	return ftrace_modify_code(rec->ip, addr, false, false);  in ftrace_make_nop()
142 	return ftrace_modify_code(rec->ip, addr, true, true);  in ftrace_modify_call()
153 	if (unlikely(atomic_read(&current->tracing_graph_pause)))  in prepare_ftrace_return()
161 		 * For csky-gcc function has sub-call:  in prepare_ftrace_return()
168 		 * We only need set *parent for resume  in prepare_ftrace_return()
170 		 * For csky-gcc function has no sub-call:  in prepare_ftrace_return()
176 		 * We need set *parent and *(frame_pointer + 4) for resume,  in prepare_ftrace_return()
212 	if (atomic_inc_return(&param->cpu_count) == 1) {  in __ftrace_modify_code()
213 		ftrace_modify_all_code(param->command);  in __ftrace_modify_code()
214 		atomic_inc(&param->cpu_count);  in __ftrace_modify_code()
216 		while (atomic_read(&param->cpu_count) <= num_online_cpus())  in __ftrace_modify_code()