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