1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_FTRACE
3 #define _ASM_POWERPC_FTRACE
4
5 #include <asm/types.h>
6
7 #ifdef CONFIG_FUNCTION_TRACER
8 #define MCOUNT_ADDR ((unsigned long)(_mcount))
9 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
10
11 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
12
13 #ifndef __ASSEMBLY__
14 extern void _mcount(void);
15
ftrace_call_adjust(unsigned long addr)16 static inline unsigned long ftrace_call_adjust(unsigned long addr)
17 {
18 /* relocation of mcount call site is the same as the address */
19 return addr;
20 }
21
22 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
23 unsigned long sp);
24
25 struct dyn_arch_ftrace {
26 struct module *mod;
27 };
28
29 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
30 struct ftrace_regs {
31 struct pt_regs regs;
32 };
33
arch_ftrace_get_regs(struct ftrace_regs * fregs)34 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
35 {
36 /* We clear regs.msr in ftrace_call */
37 return fregs->regs.msr ? &fregs->regs : NULL;
38 }
39
ftrace_instruction_pointer_set(struct ftrace_regs * fregs,unsigned long ip)40 static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
41 unsigned long ip)
42 {
43 regs_set_return_ip(&fregs->regs, ip);
44 }
45
46 struct ftrace_ops;
47
48 #define ftrace_graph_func ftrace_graph_func
49 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
50 struct ftrace_ops *op, struct ftrace_regs *fregs);
51 #endif
52 #endif /* __ASSEMBLY__ */
53
54 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
55 #define ARCH_SUPPORTS_FTRACE_OPS 1
56 #endif
57 #endif /* CONFIG_FUNCTION_TRACER */
58
59 #ifndef __ASSEMBLY__
60 #ifdef CONFIG_FTRACE_SYSCALLS
61 /*
62 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
63 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
64 * those.
65 */
66 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
arch_syscall_match_sym_name(const char * sym,const char * name)67 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
68 {
69 return !strcmp(sym, name) ||
70 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
71 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
72 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
73 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
74 }
75 #endif /* CONFIG_FTRACE_SYSCALLS */
76
77 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
78 #include <asm/paca.h>
79
this_cpu_disable_ftrace(void)80 static inline void this_cpu_disable_ftrace(void)
81 {
82 get_paca()->ftrace_enabled = 0;
83 }
84
this_cpu_enable_ftrace(void)85 static inline void this_cpu_enable_ftrace(void)
86 {
87 get_paca()->ftrace_enabled = 1;
88 }
89
90 /* Disable ftrace on this CPU if possible (may not be implemented) */
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)91 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
92 {
93 get_paca()->ftrace_enabled = ftrace_enabled;
94 }
95
this_cpu_get_ftrace_enabled(void)96 static inline u8 this_cpu_get_ftrace_enabled(void)
97 {
98 return get_paca()->ftrace_enabled;
99 }
100
101 void ftrace_free_init_tramp(void);
102 #else /* CONFIG_PPC64 */
this_cpu_disable_ftrace(void)103 static inline void this_cpu_disable_ftrace(void) { }
this_cpu_enable_ftrace(void)104 static inline void this_cpu_enable_ftrace(void) { }
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)105 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
this_cpu_get_ftrace_enabled(void)106 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
ftrace_free_init_tramp(void)107 static inline void ftrace_free_init_tramp(void) { }
108 #endif /* CONFIG_PPC64 */
109 #endif /* !__ASSEMBLY__ */
110
111 #endif /* _ASM_POWERPC_FTRACE */
112