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 void *ftrace_func; 22 23struct dyn_arch_ftrace { }; 24 25#define MCOUNT_ADDR 0 26#define FTRACE_ADDR ((unsigned long)ftrace_caller) 27 28#define KPROBE_ON_FTRACE_NOP 0 29#define KPROBE_ON_FTRACE_CALL 1 30 31struct module; 32struct dyn_ftrace; 33 34bool ftrace_need_init_nop(void); 35#define ftrace_need_init_nop ftrace_need_init_nop 36 37int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 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 45/* 46 * Even though the system call numbers are identical for s390/s390x a 47 * different system call table is used for compat tasks. This may lead 48 * to e.g. incorrect or missing trace event sysfs files. 49 * Therefore simply do not trace compat system calls at all. 50 * See kernel/trace/trace_syscalls.c. 51 */ 52#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 53static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) 54{ 55 return is_compat_task(); 56} 57 58#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 59static inline bool arch_syscall_match_sym_name(const char *sym, 60 const char *name) 61{ 62 /* 63 * Skip __s390_ and __s390x_ prefix - due to compat wrappers 64 * and aliasing some symbols of 64 bit system call functions 65 * may get the __s390_ prefix instead of the __s390x_ prefix. 66 */ 67 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name); 68} 69 70#endif /* __ASSEMBLY__ */ 71#endif /* _ASM_S390_FTRACE_H */ 72