sh/kernel/ftrace.c

41  * 8c01106c:       68 24           .word 0x2468     <--- ip
43  * 8c011070:       26 4f           lds.l   @r15+,pr <--- ip + MCOUNT_INSN_SIZE
48 static unsigned char *ftrace_nop_replace(unsigned long ip)
50 	__raw_writel(ip + MCOUNT_INSN_SIZE, ftrace_nop);
54 static unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
168 do_ftrace_mod_code(unsigned long ip, void *new_code)
170 	mod_code_ip = (void *)ip;
192 static int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
206 	if (copy_from_kernel_nofault(replaced, (void *)ip, MCOUNT_INSN_SIZE))
214 	if (do_ftrace_mod_code(ip, new_code))
217 	flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);
224 	unsigned long ip = (unsigned long)(&ftrace_call) + MCOUNT_INSN_OFFSET;
227 	memcpy(old, (unsigned char *)ip, MCOUNT_INSN_SIZE);
228 	new = ftrace_call_replace(ip, (unsigned long)func);
230 	return ftrace_modify_code(ip, old, new);
237 	unsigned long ip = rec->ip;
239 	old = ftrace_call_replace(ip, addr);
240 	new = ftrace_nop_replace(ip);
242 	return ftrace_modify_code(rec->ip, old, new);
248 	unsigned long ip = rec->ip;
250 	old = ftrace_nop_replace(ip);
251 	new = ftrace_call_replace(ip, addr);
253 	return ftrace_modify_code(rec->ip, old, new);
261 static int ftrace_mod(unsigned long ip, unsigned long old_addr,
266 	if (copy_from_kernel_nofault(code, (void *)ip, MCOUNT_INSN_SIZE))
272 	__raw_writel(new_addr, ip);
278 	unsigned long ip, old_addr, new_addr;
280 	ip = (unsigned long)(&ftrace_graph_call) + GRAPH_INSN_OFFSET;
284 	return ftrace_mod(ip, old_addr, new_addr);
289 	unsigned long ip, old_addr, new_addr;
291 	ip = (unsigned long)(&ftrace_graph_call) + GRAPH_INSN_OFFSET;
295 	return ftrace_mod(ip, old_addr, new_addr);