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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
7#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
8#define MCOUNT_INSN_SIZE 6
9#else
10#define MCOUNT_INSN_SIZE 24
11#define MCOUNT_RETURN_FIXUP 18
12#endif
13
14#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
15
16#ifndef __ASSEMBLY__
17
18#ifdef CONFIG_CC_IS_CLANG
19/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
20#define ftrace_return_address(n) 0UL
21#else
22#define ftrace_return_address(n) __builtin_return_address(n)
23#endif
24
25void _mcount(void);
26void ftrace_caller(void);
27
28extern char ftrace_graph_caller_end;
29extern unsigned long ftrace_plt;
30
31struct dyn_arch_ftrace { };
32
33#define MCOUNT_ADDR ((unsigned long)_mcount)
34#define FTRACE_ADDR ((unsigned long)ftrace_caller)
35
36#define KPROBE_ON_FTRACE_NOP 0
37#define KPROBE_ON_FTRACE_CALL 1
38
39static inline unsigned long ftrace_call_adjust(unsigned long addr)
40{
41 return addr;
42}
43
44struct ftrace_insn {
45 u16 opc;
46 s32 disp;
47} __packed;
48
49static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
50{
51#ifdef CONFIG_FUNCTION_TRACER
52#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
53 /* brcl 0,0 */
54 insn->opc = 0xc004;
55 insn->disp = 0;
56#else
57 /* jg .+24 */
58 insn->opc = 0xc0f4;
59 insn->disp = MCOUNT_INSN_SIZE / 2;
60#endif
61#endif
62}
63
64static inline int is_ftrace_nop(struct ftrace_insn *insn)
65{
66#ifdef CONFIG_FUNCTION_TRACER
67#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
68 if (insn->disp == 0)
69 return 1;
70#else
71 if (insn->disp == MCOUNT_INSN_SIZE / 2)
72 return 1;
73#endif
74#endif
75 return 0;
76}
77
78static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
79 unsigned long ip)
80{
81#ifdef CONFIG_FUNCTION_TRACER
82 unsigned long target;
83
84 /* brasl r0,ftrace_caller */
85 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
86 insn->opc = 0xc005;
87 insn->disp = (target - ip) / 2;
88#endif
89}
90
91/*
92 * Even though the system call numbers are identical for s390/s390x a
93 * different system call table is used for compat tasks. This may lead
94 * to e.g. incorrect or missing trace event sysfs files.
95 * Therefore simply do not trace compat system calls at all.
96 * See kernel/trace/trace_syscalls.c.
97 */
98#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
99static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
100{
101 return is_compat_task();
102}
103
104#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
105static inline bool arch_syscall_match_sym_name(const char *sym,
106 const char *name)
107{
108 /*
109 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
110 * and aliasing some symbols of 64 bit system call functions
111 * may get the __s390_ prefix instead of the __s390x_ prefix.
112 */
113 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
114}
115
116#endif /* __ASSEMBLY__ */
117#endif /* _ASM_S390_FTRACE_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_S390_FTRACE_H
3#define _ASM_S390_FTRACE_H
4
5#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
6#define ARCH_SUPPORTS_FTRACE_OPS 1
7#define MCOUNT_INSN_SIZE 6
8
9#ifndef __ASSEMBLY__
10
11#ifdef CONFIG_CC_IS_CLANG
12/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
13#define ftrace_return_address(n) 0UL
14#else
15#define ftrace_return_address(n) __builtin_return_address(n)
16#endif
17
18void ftrace_caller(void);
19
20extern char ftrace_graph_caller_end;
21extern unsigned long ftrace_plt;
22extern void *ftrace_func;
23
24struct dyn_arch_ftrace { };
25
26#define MCOUNT_ADDR 0
27#define FTRACE_ADDR ((unsigned long)ftrace_caller)
28
29#define KPROBE_ON_FTRACE_NOP 0
30#define KPROBE_ON_FTRACE_CALL 1
31
32struct module;
33struct dyn_ftrace;
34/*
35 * Either -mhotpatch or -mnop-mcount is used - no explicit init is required
36 */
37static inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) { return 0; }
38#define ftrace_init_nop ftrace_init_nop
39
40static inline unsigned long ftrace_call_adjust(unsigned long addr)
41{
42 return addr;
43}
44
45struct ftrace_insn {
46 u16 opc;
47 s32 disp;
48} __packed;
49
50static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
51{
52#ifdef CONFIG_FUNCTION_TRACER
53 /* brcl 0,0 */
54 insn->opc = 0xc004;
55 insn->disp = 0;
56#endif
57}
58
59static inline int is_ftrace_nop(struct ftrace_insn *insn)
60{
61#ifdef CONFIG_FUNCTION_TRACER
62 if (insn->disp == 0)
63 return 1;
64#endif
65 return 0;
66}
67
68static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
69 unsigned long ip)
70{
71#ifdef CONFIG_FUNCTION_TRACER
72 unsigned long target;
73
74 /* brasl r0,ftrace_caller */
75 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
76 insn->opc = 0xc005;
77 insn->disp = (target - ip) / 2;
78#endif
79}
80
81/*
82 * Even though the system call numbers are identical for s390/s390x a
83 * different system call table is used for compat tasks. This may lead
84 * to e.g. incorrect or missing trace event sysfs files.
85 * Therefore simply do not trace compat system calls at all.
86 * See kernel/trace/trace_syscalls.c.
87 */
88#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
89static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
90{
91 return is_compat_task();
92}
93
94#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
95static inline bool arch_syscall_match_sym_name(const char *sym,
96 const char *name)
97{
98 /*
99 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
100 * and aliasing some symbols of 64 bit system call functions
101 * may get the __s390_ prefix instead of the __s390x_ prefix.
102 */
103 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
104}
105
106#endif /* __ASSEMBLY__ */
107#endif /* _ASM_S390_FTRACE_H */