1 #ifndef _ASM_S390_FTRACE_H 2 #define _ASM_S390_FTRACE_H 3 4 #define ARCH_SUPPORTS_FTRACE_OPS 1 5 6 #ifdef CC_USING_HOTPATCH 7 #define MCOUNT_INSN_SIZE 6 8 #else 9 #define MCOUNT_INSN_SIZE 24 10 #define MCOUNT_RETURN_FIXUP 18 11 #endif 12 13 #ifndef __ASSEMBLY__ 14 15 unsigned long return_address(int depth); 16 17 #define ftrace_return_address(n) return_address(n) 18 19 void _mcount(void); 20 void ftrace_caller(void); 21 22 extern char ftrace_graph_caller_end; 23 extern unsigned long ftrace_plt; 24 25 struct dyn_arch_ftrace { }; 26 27 #define MCOUNT_ADDR ((unsigned long)_mcount) 28 #define FTRACE_ADDR ((unsigned long)ftrace_caller) 29 30 #define KPROBE_ON_FTRACE_NOP 0 31 #define KPROBE_ON_FTRACE_CALL 1 32 33 static inline unsigned long ftrace_call_adjust(unsigned long addr) 34 { 35 return addr; 36 } 37 38 struct ftrace_insn { 39 u16 opc; 40 s32 disp; 41 } __packed; 42 43 static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn) 44 { 45 #ifdef CONFIG_FUNCTION_TRACER 46 #ifdef CC_USING_HOTPATCH 47 /* brcl 0,0 */ 48 insn->opc = 0xc004; 49 insn->disp = 0; 50 #else 51 /* jg .+24 */ 52 insn->opc = 0xc0f4; 53 insn->disp = MCOUNT_INSN_SIZE / 2; 54 #endif 55 #endif 56 } 57 58 static inline int is_ftrace_nop(struct ftrace_insn *insn) 59 { 60 #ifdef CONFIG_FUNCTION_TRACER 61 #ifdef CC_USING_HOTPATCH 62 if (insn->disp == 0) 63 return 1; 64 #else 65 if (insn->disp == MCOUNT_INSN_SIZE / 2) 66 return 1; 67 #endif 68 #endif 69 return 0; 70 } 71 72 static inline void ftrace_generate_call_insn(struct ftrace_insn *insn, 73 unsigned long ip) 74 { 75 #ifdef CONFIG_FUNCTION_TRACER 76 unsigned long target; 77 78 /* brasl r0,ftrace_caller */ 79 target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR; 80 insn->opc = 0xc005; 81 insn->disp = (target - ip) / 2; 82 #endif 83 } 84 85 #endif /* __ASSEMBLY__ */ 86 #endif /* _ASM_S390_FTRACE_H */ 87