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 17void _mcount(void); 18void ftrace_caller(void); 19 20extern char ftrace_graph_caller_end; 21extern unsigned long ftrace_plt; 22 23struct 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 31static inline unsigned long ftrace_call_adjust(unsigned long addr) 32{ 33 return addr; 34} 35 36struct ftrace_insn { 37 u16 opc; 38 s32 disp; 39} __packed; 40 41static 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 56static 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 70static 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