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;
30 extern void *ftrace_func;
32 struct dyn_arch_ftrace { };
34 #define MCOUNT_ADDR ((unsigned long)_mcount)
35 #define FTRACE_ADDR ((unsigned long)ftrace_caller)
37 #define KPROBE_ON_FTRACE_NOP 0
38 #define KPROBE_ON_FTRACE_CALL 1
40 static inline unsigned long ftrace_call_adjust(unsigned long addr)
50 static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
52 #ifdef CONFIG_FUNCTION_TRACER
53 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
60 insn->disp = MCOUNT_INSN_SIZE / 2;
65 static inline int is_ftrace_nop(struct ftrace_insn *insn)
67 #ifdef CONFIG_FUNCTION_TRACER
68 #if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
72 if (insn->disp == MCOUNT_INSN_SIZE / 2)
79 static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
82 #ifdef CONFIG_FUNCTION_TRACER
85 /* brasl r0,ftrace_caller */
86 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
88 insn->disp = (target - ip) / 2;
93 * Even though the system call numbers are identical for s390/s390x a
94 * different system call table is used for compat tasks. This may lead
95 * to e.g. incorrect or missing trace event sysfs files.
96 * Therefore simply do not trace compat system calls at all.
97 * See kernel/trace/trace_syscalls.c.
99 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
100 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
102 return is_compat_task();
105 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
106 static inline bool arch_syscall_match_sym_name(const char *sym,
110 * Skip __s390_ and __s390x_ prefix - due to compat wrappers
111 * and aliasing some symbols of 64 bit system call functions
112 * may get the __s390_ prefix instead of the __s390x_ prefix.
114 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
117 #endif /* __ASSEMBLY__ */
118 #endif /* _ASM_S390_FTRACE_H */