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 void *ftrace_func; 21 22 struct dyn_arch_ftrace { }; 23 24 #define MCOUNT_ADDR 0 25 #define FTRACE_ADDR ((unsigned long)ftrace_caller) 26 27 #define KPROBE_ON_FTRACE_NOP 0 28 #define KPROBE_ON_FTRACE_CALL 1 29 30 struct module; 31 struct dyn_ftrace; 32 33 bool ftrace_need_init_nop(void); 34 #define ftrace_need_init_nop ftrace_need_init_nop 35 36 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 37 #define ftrace_init_nop ftrace_init_nop 38 39 static inline unsigned long ftrace_call_adjust(unsigned long addr) 40 { 41 return addr; 42 } 43 44 struct ftrace_regs { 45 struct pt_regs regs; 46 }; 47 48 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) 49 { 50 return &fregs->regs; 51 } 52 53 static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs, 54 unsigned long ip) 55 { 56 struct pt_regs *regs = arch_ftrace_get_regs(fregs); 57 58 regs->psw.addr = ip; 59 } 60 61 /* 62 * When an ftrace registered caller is tracing a function that is 63 * also set by a register_ftrace_direct() call, it needs to be 64 * differentiated in the ftrace_caller trampoline. To do this, 65 * place the direct caller in the ORIG_GPR2 part of pt_regs. This 66 * tells the ftrace_caller that there's a direct caller. 67 */ 68 static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr) 69 { 70 regs->orig_gpr2 = addr; 71 } 72 73 /* 74 * Even though the system call numbers are identical for s390/s390x a 75 * different system call table is used for compat tasks. This may lead 76 * to e.g. incorrect or missing trace event sysfs files. 77 * Therefore simply do not trace compat system calls at all. 78 * See kernel/trace/trace_syscalls.c. 79 */ 80 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 81 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) 82 { 83 return is_compat_task(); 84 } 85 86 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 87 static inline bool arch_syscall_match_sym_name(const char *sym, 88 const char *name) 89 { 90 /* 91 * Skip __s390_ and __s390x_ prefix - due to compat wrappers 92 * and aliasing some symbols of 64 bit system call functions 93 * may get the __s390_ prefix instead of the __s390x_ prefix. 94 */ 95 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name); 96 } 97 98 #endif /* __ASSEMBLY__ */ 99 100 #ifdef CONFIG_FUNCTION_TRACER 101 102 #define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */ 103 104 #ifndef CC_USING_HOTPATCH 105 106 #define FTRACE_GEN_MCOUNT_RECORD(name) \ 107 .section __mcount_loc, "a", @progbits; \ 108 .quad name; \ 109 .previous; 110 111 #else /* !CC_USING_HOTPATCH */ 112 113 #define FTRACE_GEN_MCOUNT_RECORD(name) 114 115 #endif /* !CC_USING_HOTPATCH */ 116 117 #define FTRACE_GEN_NOP_ASM(name) \ 118 FTRACE_GEN_MCOUNT_RECORD(name) \ 119 FTRACE_NOP_INSN 120 121 #else /* CONFIG_FUNCTION_TRACER */ 122 123 #define FTRACE_GEN_NOP_ASM(name) 124 125 #endif /* CONFIG_FUNCTION_TRACER */ 126 127 #endif /* _ASM_S390_FTRACE_H */ 128