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 #ifdef __ASSEMBLY__
12
13 /* Based off of objdump optput from glibc */
14
15 #define MCOUNT_SAVE_FRAME \
16 stwu r1,-48(r1); \
17 stw r3, 12(r1); \
18 stw r4, 16(r1); \
19 stw r5, 20(r1); \
20 stw r6, 24(r1); \
21 mflr r3; \
22 lwz r4, 52(r1); \
23 mfcr r5; \
24 stw r7, 28(r1); \
25 stw r8, 32(r1); \
26 stw r9, 36(r1); \
27 stw r10,40(r1); \
28 stw r3, 44(r1); \
29 stw r5, 8(r1)
30
31 #define MCOUNT_RESTORE_FRAME \
32 lwz r6, 8(r1); \
33 lwz r0, 44(r1); \
34 lwz r3, 12(r1); \
35 mtctr r0; \
36 lwz r4, 16(r1); \
37 mtcr r6; \
38 lwz r5, 20(r1); \
39 lwz r6, 24(r1); \
40 lwz r0, 52(r1); \
41 lwz r7, 28(r1); \
42 lwz r8, 32(r1); \
43 mtlr r0; \
44 lwz r9, 36(r1); \
45 lwz r10,40(r1); \
46 addi r1, r1, 48
47
48 #else /* !__ASSEMBLY__ */
49 extern void _mcount(void);
50
ftrace_call_adjust(unsigned long addr)51 static inline unsigned long ftrace_call_adjust(unsigned long addr)
52 {
53 /* reloction of mcount call site is the same as the address */
54 return addr;
55 }
56
57 struct dyn_arch_ftrace {
58 struct module *mod;
59 };
60 #endif /* __ASSEMBLY__ */
61
62 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
63 #define ARCH_SUPPORTS_FTRACE_OPS 1
64 #endif
65 #endif /* CONFIG_FUNCTION_TRACER */
66
67 #ifndef __ASSEMBLY__
68 #ifdef CONFIG_FTRACE_SYSCALLS
69 /*
70 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
71 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
72 * those.
73 */
74 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
75 #ifdef PPC64_ELF_ABI_v1
arch_syscall_match_sym_name(const char * sym,const char * name)76 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
77 {
78 /* We need to skip past the initial dot, and the __se_sys alias */
79 return !strcmp(sym + 1, name) ||
80 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
81 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
82 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
83 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
84 }
85 #else
arch_syscall_match_sym_name(const char * sym,const char * name)86 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
87 {
88 return !strcmp(sym, name) ||
89 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
90 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
91 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
92 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
93 }
94 #endif /* PPC64_ELF_ABI_v1 */
95 #endif /* CONFIG_FTRACE_SYSCALLS */
96
97 #ifdef CONFIG_PPC64
98 #include <asm/paca.h>
99
this_cpu_disable_ftrace(void)100 static inline void this_cpu_disable_ftrace(void)
101 {
102 get_paca()->ftrace_enabled = 0;
103 }
104
this_cpu_enable_ftrace(void)105 static inline void this_cpu_enable_ftrace(void)
106 {
107 get_paca()->ftrace_enabled = 1;
108 }
109 #else /* CONFIG_PPC64 */
this_cpu_disable_ftrace(void)110 static inline void this_cpu_disable_ftrace(void) { }
this_cpu_enable_ftrace(void)111 static inline void this_cpu_enable_ftrace(void) { }
112 #endif /* CONFIG_PPC64 */
113 #endif /* !__ASSEMBLY__ */
114
115 #endif /* _ASM_POWERPC_FTRACE */
116
