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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__
14extern void _mcount(void);
15
16static 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
22unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
23 unsigned long sp);
24
25struct dyn_arch_ftrace {
26 struct module *mod;
27};
28
29#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
30struct ftrace_regs {
31 struct pt_regs regs;
32};
33
34static __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
40static __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
46struct ftrace_ops;
47
48#define ftrace_graph_func ftrace_graph_func
49void 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
67#ifdef PPC64_ELF_ABI_v1
68static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
69{
70 /* We need to skip past the initial dot, and the __se_sys alias */
71 return !strcmp(sym + 1, name) ||
72 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
73 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
74 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
75 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
76}
77#else
78static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
79{
80 return !strcmp(sym, name) ||
81 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
82 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
83 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
84 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
85}
86#endif /* PPC64_ELF_ABI_v1 */
87#endif /* CONFIG_FTRACE_SYSCALLS */
88
89#ifdef CONFIG_PPC64
90#include <asm/paca.h>
91
92static inline void this_cpu_disable_ftrace(void)
93{
94 get_paca()->ftrace_enabled = 0;
95}
96
97static inline void this_cpu_enable_ftrace(void)
98{
99 get_paca()->ftrace_enabled = 1;
100}
101
102/* Disable ftrace on this CPU if possible (may not be implemented) */
103static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
104{
105 get_paca()->ftrace_enabled = ftrace_enabled;
106}
107
108static inline u8 this_cpu_get_ftrace_enabled(void)
109{
110 return get_paca()->ftrace_enabled;
111}
112
113#else /* CONFIG_PPC64 */
114static inline void this_cpu_disable_ftrace(void) { }
115static inline void this_cpu_enable_ftrace(void) { }
116static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
117static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
118#endif /* CONFIG_PPC64 */
119#endif /* !__ASSEMBLY__ */
120
121#endif /* _ASM_POWERPC_FTRACE */