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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
10unsigned long return_address(unsigned int n);
11#define ftrace_return_address(n) return_address(n)
12
13void ftrace_caller(void);
14
15extern void *ftrace_func;
16
17struct dyn_arch_ftrace { };
18
19#define MCOUNT_ADDR 0
20#define FTRACE_ADDR ((unsigned long)ftrace_caller)
21
22#define KPROBE_ON_FTRACE_NOP 0
23#define KPROBE_ON_FTRACE_CALL 1
24
25struct module;
26struct dyn_ftrace;
27
28bool ftrace_need_init_nop(void);
29#define ftrace_need_init_nop ftrace_need_init_nop
30
31int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
32#define ftrace_init_nop ftrace_init_nop
33
34static inline unsigned long ftrace_call_adjust(unsigned long addr)
35{
36 return addr;
37}
38
39struct ftrace_regs {
40 struct pt_regs regs;
41};
42
43static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
44{
45 struct pt_regs *regs = &fregs->regs;
46
47 if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
48 return regs;
49 return NULL;
50}
51
52#ifdef CONFIG_FUNCTION_GRAPH_TRACER
53struct fgraph_ret_regs {
54 unsigned long gpr2;
55 unsigned long fp;
56};
57
58static __always_inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs)
59{
60 return ret_regs->gpr2;
61}
62
63static __always_inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs)
64{
65 return ret_regs->fp;
66}
67#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
68
69static __always_inline unsigned long
70ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs)
71{
72 return fregs->regs.psw.addr;
73}
74
75static __always_inline void
76ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
77 unsigned long ip)
78{
79 fregs->regs.psw.addr = ip;
80}
81
82#define ftrace_regs_get_argument(fregs, n) \
83 regs_get_kernel_argument(&(fregs)->regs, n)
84#define ftrace_regs_get_stack_pointer(fregs) \
85 kernel_stack_pointer(&(fregs)->regs)
86#define ftrace_regs_return_value(fregs) \
87 regs_return_value(&(fregs)->regs)
88#define ftrace_regs_set_return_value(fregs, ret) \
89 regs_set_return_value(&(fregs)->regs, ret)
90#define ftrace_override_function_with_return(fregs) \
91 override_function_with_return(&(fregs)->regs)
92#define ftrace_regs_query_register_offset(name) \
93 regs_query_register_offset(name)
94
95#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
96/*
97 * When an ftrace registered caller is tracing a function that is
98 * also set by a register_ftrace_direct() call, it needs to be
99 * differentiated in the ftrace_caller trampoline. To do this,
100 * place the direct caller in the ORIG_GPR2 part of pt_regs. This
101 * tells the ftrace_caller that there's a direct caller.
102 */
103static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
104{
105 struct pt_regs *regs = &fregs->regs;
106 regs->orig_gpr2 = addr;
107}
108#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
109
110/*
111 * Even though the system call numbers are identical for s390/s390x a
112 * different system call table is used for compat tasks. This may lead
113 * to e.g. incorrect or missing trace event sysfs files.
114 * Therefore simply do not trace compat system calls at all.
115 * See kernel/trace/trace_syscalls.c.
116 */
117#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
118static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
119{
120 return is_compat_task();
121}
122
123#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
124static inline bool arch_syscall_match_sym_name(const char *sym,
125 const char *name)
126{
127 /*
128 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
129 * and aliasing some symbols of 64 bit system call functions
130 * may get the __s390_ prefix instead of the __s390x_ prefix.
131 */
132 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
133}
134
135#endif /* __ASSEMBLY__ */
136
137#ifdef CONFIG_FUNCTION_TRACER
138
139#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
140
141#ifndef CC_USING_HOTPATCH
142
143#define FTRACE_GEN_MCOUNT_RECORD(name) \
144 .section __mcount_loc, "a", @progbits; \
145 .quad name; \
146 .previous;
147
148#else /* !CC_USING_HOTPATCH */
149
150#define FTRACE_GEN_MCOUNT_RECORD(name)
151
152#endif /* !CC_USING_HOTPATCH */
153
154#define FTRACE_GEN_NOP_ASM(name) \
155 FTRACE_GEN_MCOUNT_RECORD(name) \
156 FTRACE_NOP_INSN
157
158#else /* CONFIG_FUNCTION_TRACER */
159
160#define FTRACE_GEN_NOP_ASM(name)
161
162#endif /* CONFIG_FUNCTION_TRACER */
163
164#endif /* _ASM_S390_FTRACE_H */