1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_S390_FTRACE_H
3 #define _ASM_S390_FTRACE_H
5 #define ARCH_SUPPORTS_FTRACE_OPS 1
7 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
8 #define MCOUNT_INSN_SIZE 6
10 #define MCOUNT_INSN_SIZE 24
11 #define MCOUNT_RETURN_FIXUP 18
16 #define ftrace_return_address(n) __builtin_return_address(n)
19 void ftrace_caller(void);
21 extern char ftrace_graph_caller_end;
22 extern unsigned long ftrace_plt;
24 struct dyn_arch_ftrace { };
26 #define MCOUNT_ADDR ((unsigned long)_mcount)
27 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
29 #define KPROBE_ON_FTRACE_NOP 0
30 #define KPROBE_ON_FTRACE_CALL 1
32 static inline unsigned long ftrace_call_adjust(unsigned long addr)
42 static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
44 #ifdef CONFIG_FUNCTION_TRACER
45 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
52 insn->disp = MCOUNT_INSN_SIZE / 2;
57 static inline int is_ftrace_nop(struct ftrace_insn *insn)
59 #ifdef CONFIG_FUNCTION_TRACER
60 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
64 if (insn->disp == MCOUNT_INSN_SIZE / 2)
71 static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
74 #ifdef CONFIG_FUNCTION_TRACER
77 /* brasl r0,ftrace_caller */
78 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
80 insn->disp = (target - ip) / 2;
85 * Even though the system call numbers are identical for s390/s390x a
86 * different system call table is used for compat tasks. This may lead
87 * to e.g. incorrect or missing trace event sysfs files.
88 * Therefore simply do not trace compat system calls at all.
89 * See kernel/trace/trace_syscalls.c.
91 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
92 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
94 return is_compat_task();
97 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
98 static inline bool arch_syscall_match_sym_name(const char *sym,
102 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
103 * and aliasing some symbols of 64 bit system call functions
104 * may get the __s390_ prefix instead of the __s390x_ prefix.
106 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
109 #endif /* __ASSEMBLY__ */
110 #endif /* _ASM_S390_FTRACE_H */