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 unsigned long return_address(unsigned int n); 12 #define ftrace_return_address(n) return_address(n) 13 14 void ftrace_caller(void); 15 16 extern void *ftrace_func; 17 18 struct dyn_arch_ftrace { }; 19 20 #define MCOUNT_ADDR 0 21 #define FTRACE_ADDR ((unsigned long)ftrace_caller) 22 23 #define KPROBE_ON_FTRACE_NOP 0 24 #define KPROBE_ON_FTRACE_CALL 1 25 26 struct module; 27 struct dyn_ftrace; 28 29 bool ftrace_need_init_nop(void); 30 #define ftrace_need_init_nop ftrace_need_init_nop 31 32 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 33 #define ftrace_init_nop ftrace_init_nop 34 35 static inline unsigned long ftrace_call_adjust(unsigned long addr) 36 { 37 return addr; 38 } 39 40 struct ftrace_regs { 41 struct pt_regs regs; 42 }; 43 44 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) 45 { 46 struct pt_regs *regs = &fregs->regs; 47 48 if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS)) 49 return regs; 50 return NULL; 51 } 52 53 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 54 struct fgraph_ret_regs { 55 unsigned long gpr2; 56 unsigned long fp; 57 }; 58 59 static __always_inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs) 60 { 61 return ret_regs->gpr2; 62 } 63 64 static __always_inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs) 65 { 66 return ret_regs->fp; 67 } 68 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 69 70 static __always_inline unsigned long 71 ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs) 72 { 73 return fregs->regs.psw.addr; 74 } 75 76 static __always_inline void 77 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, 78 unsigned long ip) 79 { 80 fregs->regs.psw.addr = ip; 81 } 82 83 #define ftrace_regs_get_argument(fregs, n) \ 84 regs_get_kernel_argument(&(fregs)->regs, n) 85 #define ftrace_regs_get_stack_pointer(fregs) \ 86 kernel_stack_pointer(&(fregs)->regs) 87 #define ftrace_regs_return_value(fregs) \ 88 regs_return_value(&(fregs)->regs) 89 #define ftrace_regs_set_return_value(fregs, ret) \ 90 regs_set_return_value(&(fregs)->regs, ret) 91 #define ftrace_override_function_with_return(fregs) \ 92 override_function_with_return(&(fregs)->regs) 93 #define ftrace_regs_query_register_offset(name) \ 94 regs_query_register_offset(name) 95 96 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 97 /* 98 * When an ftrace registered caller is tracing a function that is 99 * also set by a register_ftrace_direct() call, it needs to be 100 * differentiated in the ftrace_caller trampoline. To do this, 101 * place the direct caller in the ORIG_GPR2 part of pt_regs. This 102 * tells the ftrace_caller that there's a direct caller. 103 */ 104 static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr) 105 { 106 struct pt_regs *regs = &fregs->regs; 107 regs->orig_gpr2 = addr; 108 } 109 #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ 110 111 /* 112 * Even though the system call numbers are identical for s390/s390x a 113 * different system call table is used for compat tasks. This may lead 114 * to e.g. incorrect or missing trace event sysfs files. 115 * Therefore simply do not trace compat system calls at all. 116 * See kernel/trace/trace_syscalls.c. 117 */ 118 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 119 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) 120 { 121 return is_compat_task(); 122 } 123 124 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 125 static inline bool arch_syscall_match_sym_name(const char *sym, 126 const char *name) 127 { 128 /* 129 * Skip __s390_ and __s390x_ prefix - due to compat wrappers 130 * and aliasing some symbols of 64 bit system call functions 131 * may get the __s390_ prefix instead of the __s390x_ prefix. 132 */ 133 return !strcmp(sym + 7, name) || !strcmp(sym + 8, name); 134 } 135 136 #endif /* __ASSEMBLY__ */ 137 138 #ifdef CONFIG_FUNCTION_TRACER 139 140 #define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */ 141 142 #ifndef CC_USING_HOTPATCH 143 144 #define FTRACE_GEN_MCOUNT_RECORD(name) \ 145 .section __mcount_loc, "a", @progbits; \ 146 .quad name; \ 147 .previous; 148 149 #else /* !CC_USING_HOTPATCH */ 150 151 #define FTRACE_GEN_MCOUNT_RECORD(name) 152 153 #endif /* !CC_USING_HOTPATCH */ 154 155 #define FTRACE_GEN_NOP_ASM(name) \ 156 FTRACE_GEN_MCOUNT_RECORD(name) \ 157 FTRACE_NOP_INSN 158 159 #else /* CONFIG_FUNCTION_TRACER */ 160 161 #define FTRACE_GEN_NOP_ASM(name) 162 163 #endif /* CONFIG_FUNCTION_TRACER */ 164 165 #endif /* _ASM_S390_FTRACE_H */ 166