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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_S390_FTRACE_H
3#define _ASM_S390_FTRACE_H
4
5#define ARCH_SUPPORTS_FTRACE_OPS 1
6#define MCOUNT_INSN_SIZE 6
7
8#ifndef __ASSEMBLY__
9#include <asm/stacktrace.h>
10
11static __always_inline unsigned long return_address(unsigned int n)
12{
13 struct stack_frame *sf;
14
15 if (!n)
16 return (unsigned long)__builtin_return_address(0);
17
18 sf = (struct stack_frame *)current_frame_address();
19 do {
20 sf = (struct stack_frame *)sf->back_chain;
21 if (!sf)
22 return 0;
23 } while (--n);
24 return sf->gprs[8];
25}
26#define ftrace_return_address(n) return_address(n)
27
28void ftrace_caller(void);
29
30extern void *ftrace_func;
31
32struct dyn_arch_ftrace { };
33
34#define MCOUNT_ADDR 0
35#define FTRACE_ADDR ((unsigned long)ftrace_caller)
36
37#define KPROBE_ON_FTRACE_NOP 0
38#define KPROBE_ON_FTRACE_CALL 1
39
40struct module;
41struct dyn_ftrace;
42struct ftrace_ops;
43
44bool ftrace_need_init_nop(void);
45#define ftrace_need_init_nop ftrace_need_init_nop
46
47int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
48#define ftrace_init_nop ftrace_init_nop
49
50static inline unsigned long ftrace_call_adjust(unsigned long addr)
51{
52 return addr;
53}
54#define ftrace_get_symaddr(fentry_ip) ((unsigned long)(fentry_ip))
55
56#include <linux/ftrace_regs.h>
57
58static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
59{
60 struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
61
62 if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
63 return regs;
64 return NULL;
65}
66
67static __always_inline void
68ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
69 unsigned long ip)
70{
71 arch_ftrace_regs(fregs)->regs.psw.addr = ip;
72}
73
74#undef ftrace_regs_get_frame_pointer
75static __always_inline unsigned long
76ftrace_regs_get_frame_pointer(struct ftrace_regs *fregs)
77{
78 return ftrace_regs_get_stack_pointer(fregs);
79}
80
81static __always_inline unsigned long
82ftrace_regs_get_return_address(const struct ftrace_regs *fregs)
83{
84 return arch_ftrace_regs(fregs)->regs.gprs[14];
85}
86
87#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \
88 (_regs)->psw.mask = 0; \
89 (_regs)->psw.addr = arch_ftrace_regs(fregs)->regs.psw.addr; \
90 (_regs)->gprs[15] = arch_ftrace_regs(fregs)->regs.gprs[15]; \
91 } while (0)
92
93#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
94/*
95 * When an ftrace registered caller is tracing a function that is
96 * also set by a register_ftrace_direct() call, it needs to be
97 * differentiated in the ftrace_caller trampoline. To do this,
98 * place the direct caller in the ORIG_GPR2 part of pt_regs. This
99 * tells the ftrace_caller that there's a direct caller.
100 */
101static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
102{
103 struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs;
104 regs->orig_gpr2 = addr;
105}
106#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
107
108/*
109 * Even though the system call numbers are identical for s390/s390x a
110 * different system call table is used for compat tasks. This may lead
111 * to e.g. incorrect or missing trace event sysfs files.
112 * Therefore simply do not trace compat system calls at all.
113 * See kernel/trace/trace_syscalls.c.
114 */
115#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
116static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
117{
118 return is_compat_task();
119}
120
121#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
122static inline bool arch_syscall_match_sym_name(const char *sym,
123 const char *name)
124{
125 /*
126 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
127 * and aliasing some symbols of 64 bit system call functions
128 * may get the __s390_ prefix instead of the __s390x_ prefix.
129 */
130 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
131}
132
133void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
134 struct ftrace_ops *op, struct ftrace_regs *fregs);
135#define ftrace_graph_func ftrace_graph_func
136
137#endif /* __ASSEMBLY__ */
138
139#ifdef CONFIG_FUNCTION_TRACER
140
141#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
142
143#ifndef CC_USING_HOTPATCH
144
145#define FTRACE_GEN_MCOUNT_RECORD(name) \
146 .section __mcount_loc, "a", @progbits; \
147 .quad name; \
148 .previous;
149
150#else /* !CC_USING_HOTPATCH */
151
152#define FTRACE_GEN_MCOUNT_RECORD(name)
153
154#endif /* !CC_USING_HOTPATCH */
155
156#define FTRACE_GEN_NOP_ASM(name) \
157 FTRACE_GEN_MCOUNT_RECORD(name) \
158 FTRACE_NOP_INSN
159
160#else /* CONFIG_FUNCTION_TRACER */
161
162#define FTRACE_GEN_NOP_ASM(name)
163
164#endif /* CONFIG_FUNCTION_TRACER */
165
166#endif /* _ASM_S390_FTRACE_H */