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 #ifdef __ASSEMBLY__
14
15 /* Based off of objdump output from glibc */
16
17 #define MCOUNT_SAVE_FRAME \
18 stwu r1,-48(r1); \
19 stw r3, 12(r1); \
20 stw r4, 16(r1); \
21 stw r5, 20(r1); \
22 stw r6, 24(r1); \
23 mflr r3; \
24 lwz r4, 52(r1); \
25 mfcr r5; \
26 stw r7, 28(r1); \
27 stw r8, 32(r1); \
28 stw r9, 36(r1); \
29 stw r10,40(r1); \
30 stw r3, 44(r1); \
31 stw r5, 8(r1)
32
33 #define MCOUNT_RESTORE_FRAME \
34 lwz r6, 8(r1); \
35 lwz r0, 44(r1); \
36 lwz r3, 12(r1); \
37 mtctr r0; \
38 lwz r4, 16(r1); \
39 mtcr r6; \
40 lwz r5, 20(r1); \
41 lwz r6, 24(r1); \
42 lwz r0, 52(r1); \
43 lwz r7, 28(r1); \
44 lwz r8, 32(r1); \
45 mtlr r0; \
46 lwz r9, 36(r1); \
47 lwz r10,40(r1); \
48 addi r1, r1, 48
49
50 #else /* !__ASSEMBLY__ */
51 extern void _mcount(void);
52
ftrace_call_adjust(unsigned long addr)53 static inline unsigned long ftrace_call_adjust(unsigned long addr)
54 {
55 /* relocation of mcount call site is the same as the address */
56 return addr;
57 }
58
59 struct dyn_arch_ftrace {
60 struct module *mod;
61 };
62 #endif /* __ASSEMBLY__ */
63
64 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
65 #define ARCH_SUPPORTS_FTRACE_OPS 1
66 #endif
67 #endif /* CONFIG_FUNCTION_TRACER */
68
69 #ifndef __ASSEMBLY__
70 #ifdef CONFIG_FTRACE_SYSCALLS
71 /*
72 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
73 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
74 * those.
75 */
76 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
77 #ifdef PPC64_ELF_ABI_v1
arch_syscall_match_sym_name(const char * sym,const char * name)78 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
79 {
80 /* We need to skip past the initial dot, and the __se_sys alias */
81 return !strcmp(sym + 1, name) ||
82 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
83 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
84 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
85 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
86 }
87 #else
arch_syscall_match_sym_name(const char * sym,const char * name)88 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
89 {
90 return !strcmp(sym, name) ||
91 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
92 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
93 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
94 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
95 }
96 #endif /* PPC64_ELF_ABI_v1 */
97 #endif /* CONFIG_FTRACE_SYSCALLS */
98
99 #ifdef CONFIG_PPC64
100 #include <asm/paca.h>
101
this_cpu_disable_ftrace(void)102 static inline void this_cpu_disable_ftrace(void)
103 {
104 get_paca()->ftrace_enabled = 0;
105 }
106
this_cpu_enable_ftrace(void)107 static inline void this_cpu_enable_ftrace(void)
108 {
109 get_paca()->ftrace_enabled = 1;
110 }
111
112 /* Disable ftrace on this CPU if possible (may not be implemented) */
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)113 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
114 {
115 get_paca()->ftrace_enabled = ftrace_enabled;
116 }
117
this_cpu_get_ftrace_enabled(void)118 static inline u8 this_cpu_get_ftrace_enabled(void)
119 {
120 return get_paca()->ftrace_enabled;
121 }
122
123 #else /* CONFIG_PPC64 */
this_cpu_disable_ftrace(void)124 static inline void this_cpu_disable_ftrace(void) { }
this_cpu_enable_ftrace(void)125 static inline void this_cpu_enable_ftrace(void) { }
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
this_cpu_get_ftrace_enabled(void)127 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
128 #endif /* CONFIG_PPC64 */
129 #endif /* !__ASSEMBLY__ */
130
131 #endif /* _ASM_POWERPC_FTRACE */
132