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 18 void ftrace_caller(void); 19 20 extern char ftrace_graph_caller_end; 21 extern void *ftrace_func; 22 23 struct 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 31 struct module; 32 struct dyn_ftrace; 33 34 bool ftrace_need_init_nop(void); 35 #define ftrace_need_init_nop ftrace_need_init_nop 36 37 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 38 #define ftrace_init_nop ftrace_init_nop 39 40 static 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 53 static 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 59 static 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