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
14 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
18 #ifdef CONFIG_CC_IS_CLANG
19 /* https://bugs.llvm.org/show_bug.cgi?id=41424 */
20 #define ftrace_return_address(n) 0UL
22 #define ftrace_return_address(n) __builtin_return_address(n)
26 void ftrace_caller(void);
28 extern char ftrace_graph_caller_end;
29 extern unsigned long ftrace_plt;
31 struct dyn_arch_ftrace { };
33 #define MCOUNT_ADDR ((unsigned long)_mcount)
34 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
36 #define KPROBE_ON_FTRACE_NOP 0
37 #define KPROBE_ON_FTRACE_CALL 1
39 static inline unsigned long ftrace_call_adjust(unsigned long addr)
49 static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
51 #ifdef CONFIG_FUNCTION_TRACER
52 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
59 insn->disp = MCOUNT_INSN_SIZE / 2;
64 static inline int is_ftrace_nop(struct ftrace_insn *insn)
66 #ifdef CONFIG_FUNCTION_TRACER
67 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
71 if (insn->disp == MCOUNT_INSN_SIZE / 2)
78 static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
81 #ifdef CONFIG_FUNCTION_TRACER
84 /* brasl r0,ftrace_caller */
85 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
87 insn->disp = (target - ip) / 2;
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.
98 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
99 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
101 return is_compat_task();
104 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
105 static inline bool arch_syscall_match_sym_name(const char *sym,
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.
113 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
116 #endif /* __ASSEMBLY__ */
117 #endif /* _ASM_S390_FTRACE_H */