xref: /openbmc/linux/arch/x86/include/asm/ftrace.h (revision 68198dca)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_FTRACE_H
3 #define _ASM_X86_FTRACE_H
4 
5 #ifdef CONFIG_FUNCTION_TRACER
6 #ifdef CC_USING_FENTRY
7 # define MCOUNT_ADDR		((unsigned long)(__fentry__))
8 #else
9 # define MCOUNT_ADDR		((unsigned long)(mcount))
10 # define HAVE_FUNCTION_GRAPH_FP_TEST
11 #endif
12 #define MCOUNT_INSN_SIZE	5 /* sizeof mcount call */
13 
14 #ifdef CONFIG_DYNAMIC_FTRACE
15 #define ARCH_SUPPORTS_FTRACE_OPS 1
16 #endif
17 
18 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
19 
20 #ifndef __ASSEMBLY__
21 extern void mcount(void);
22 extern atomic_t modifying_ftrace_code;
23 extern void __fentry__(void);
24 
25 static inline unsigned long ftrace_call_adjust(unsigned long addr)
26 {
27 	/*
28 	 * addr is the address of the mcount call instruction.
29 	 * recordmcount does the necessary offset calculation.
30 	 */
31 	return addr;
32 }
33 
34 #ifdef CONFIG_DYNAMIC_FTRACE
35 
36 struct dyn_arch_ftrace {
37 	/* No extra data needed for x86 */
38 };
39 
40 int ftrace_int3_handler(struct pt_regs *regs);
41 
42 #define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
43 
44 #endif /*  CONFIG_DYNAMIC_FTRACE */
45 #endif /* __ASSEMBLY__ */
46 #endif /* CONFIG_FUNCTION_TRACER */
47 
48 
49 #if !defined(__ASSEMBLY__) && !defined(COMPILE_OFFSETS)
50 
51 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
52 #include <asm/compat.h>
53 
54 /*
55  * Because ia32 syscalls do not map to x86_64 syscall numbers
56  * this screws up the trace output when tracing a ia32 task.
57  * Instead of reporting bogus syscalls, just do not trace them.
58  *
59  * If the user really wants these, then they should use the
60  * raw syscall tracepoints with filtering.
61  */
62 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
63 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
64 {
65 	if (in_compat_syscall())
66 		return true;
67 	return false;
68 }
69 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
70 #endif /* !__ASSEMBLY__  && !COMPILE_OFFSETS */
71 
72 #endif /* _ASM_X86_FTRACE_H */
73