diff options
Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
| -rw-r--r-- | arch/s390/include/asm/ftrace.h | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 3aef8afec336..785041f1dc77 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -1,25 +1,67 @@ #ifndef _ASM_S390_FTRACE_H #define _ASM_S390_FTRACE_H +#define ARCH_SUPPORTS_FTRACE_OPS 1 + +#define MCOUNT_INSN_SIZE 24 +#define MCOUNT_RETURN_FIXUP 18 + #ifndef __ASSEMBLY__ -extern void _mcount(void); +void _mcount(void); +void ftrace_caller(void); + extern char ftrace_graph_caller_end; +extern unsigned long ftrace_plt; struct dyn_arch_ftrace { }; -#define MCOUNT_ADDR ((long)_mcount) +#define MCOUNT_ADDR ((unsigned long)_mcount) +#define FTRACE_ADDR ((unsigned long)ftrace_caller) +#define KPROBE_ON_FTRACE_NOP 0 +#define KPROBE_ON_FTRACE_CALL 1 static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; } -#endif /* __ASSEMBLY__ */ +struct ftrace_insn { + u16 opc; + s32 disp; +} __packed; -#define MCOUNT_INSN_SIZE 18 +static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn) +{ +#ifdef CONFIG_FUNCTION_TRACER + /* jg .+24 */ + insn->opc = 0xc0f4; + insn->disp = MCOUNT_INSN_SIZE / 2; +#endif +} -#define ARCH_SUPPORTS_FTRACE_OPS 1 +static inline int is_ftrace_nop(struct ftrace_insn *insn) +{ +#ifdef CONFIG_FUNCTION_TRACER + if (insn->disp == MCOUNT_INSN_SIZE / 2) + return 1; +#endif + return 0; +} + +static inline void ftrace_generate_call_insn(struct ftrace_insn *insn, + unsigned long ip) +{ +#ifdef CONFIG_FUNCTION_TRACER + unsigned long target; + /* brasl r0,ftrace_caller */ + target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR; + insn->opc = 0xc005; + insn->disp = (target - ip) / 2; +#endif +} + +#endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_FTRACE_H */ |