xref: /openbmc/linux/arch/powerpc/include/asm/ftrace.h (revision b34e08d5)
1 #ifndef _ASM_POWERPC_FTRACE
2 #define _ASM_POWERPC_FTRACE
3 
4 #ifdef CONFIG_FUNCTION_TRACER
5 #define MCOUNT_ADDR		((long)(_mcount))
6 #define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
7 
8 #ifdef __ASSEMBLY__
9 
10 /* Based off of objdump optput from glibc */
11 
12 #define MCOUNT_SAVE_FRAME			\
13 	stwu	r1,-48(r1);			\
14 	stw	r3, 12(r1);			\
15 	stw	r4, 16(r1);			\
16 	stw	r5, 20(r1);			\
17 	stw	r6, 24(r1);			\
18 	mflr	r3;				\
19 	lwz	r4, 52(r1);			\
20 	mfcr	r5;				\
21 	stw	r7, 28(r1);			\
22 	stw	r8, 32(r1);			\
23 	stw	r9, 36(r1);			\
24 	stw	r10,40(r1);			\
25 	stw	r3, 44(r1);			\
26 	stw	r5, 8(r1)
27 
28 #define MCOUNT_RESTORE_FRAME			\
29 	lwz	r6, 8(r1);			\
30 	lwz	r0, 44(r1);			\
31 	lwz	r3, 12(r1);			\
32 	mtctr	r0;				\
33 	lwz	r4, 16(r1);			\
34 	mtcr	r6;				\
35 	lwz	r5, 20(r1);			\
36 	lwz	r6, 24(r1);			\
37 	lwz	r0, 52(r1);			\
38 	lwz	r7, 28(r1);			\
39 	lwz	r8, 32(r1);			\
40 	mtlr	r0;				\
41 	lwz	r9, 36(r1);			\
42 	lwz	r10,40(r1);			\
43 	addi	r1, r1, 48
44 
45 #else /* !__ASSEMBLY__ */
46 extern void _mcount(void);
47 
48 #ifdef CONFIG_DYNAMIC_FTRACE
49 static inline unsigned long ftrace_call_adjust(unsigned long addr)
50 {
51        /* reloction of mcount call site is the same as the address */
52        return addr;
53 }
54 
55 struct dyn_arch_ftrace {
56 	struct module *mod;
57 };
58 #endif /*  CONFIG_DYNAMIC_FTRACE */
59 #endif /* __ASSEMBLY__ */
60 
61 #endif
62 
63 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__ASSEMBLY__)
64 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
65 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
66 {
67 	/*
68 	 * Compare the symbol name with the system call name. Skip the .sys or .SyS
69 	 * prefix from the symbol name and the sys prefix from the system call name and
70 	 * just match the rest. This is only needed on ppc64 since symbol names on
71 	 * 32bit do not start with a period so the generic function will work.
72 	 */
73 	return !strcmp(sym + 4, name + 3);
74 }
75 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */
76 
77 #endif /* _ASM_POWERPC_FTRACE */
78