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Diffstat (limited to 'arch/s390/include/asm/ftrace.h')
-rw-r--r--arch/s390/include/asm/ftrace.h54
1 files changed, 49 insertions, 5 deletions
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
index 3aef8afec336..abb618f1ead2 100644
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -1,25 +1,69 @@
#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);
+#define ftrace_return_address(n) __builtin_return_address(n)
+
+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;
+
+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 MCOUNT_INSN_SIZE 18
+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;
+}
-#define ARCH_SUPPORTS_FTRACE_OPS 1
+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 */