Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / s390 / include / asm / ftrace.h

diff --git a/kernel/arch/s390/include/asm/ftrace.h b/kernel/arch/s390/include/asm/ftrace.h
new file mode 100644 (file)
index 0000000..836c562
--- /dev/null
+++ b/kernel/arch/s390/include/asm/ftrace.h
@@ -0,0 +1,84 @@
+#ifndef _ASM_S390_FTRACE_H
+#define _ASM_S390_FTRACE_H
+
+#define ARCH_SUPPORTS_FTRACE_OPS 1
+
+#ifdef CC_USING_HOTPATCH
+#define MCOUNT_INSN_SIZE       6
+#else
+#define MCOUNT_INSN_SIZE       24
+#define MCOUNT_RETURN_FIXUP    18
+#endif
+
+#ifndef __ASSEMBLY__
+
+#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 ((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;
+}
+
+struct ftrace_insn {
+       u16 opc;
+       s32 disp;
+} __packed;
+
+static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
+{
+#ifdef CONFIG_FUNCTION_TRACER
+#ifdef CC_USING_HOTPATCH
+       /* brcl 0,0 */
+       insn->opc = 0xc004;
+       insn->disp = 0;
+#else
+       /* jg .+24 */
+       insn->opc = 0xc0f4;
+       insn->disp = MCOUNT_INSN_SIZE / 2;
+#endif
+#endif
+}
+
+static inline int is_ftrace_nop(struct ftrace_insn *insn)
+{
+#ifdef CONFIG_FUNCTION_TRACER
+#ifdef CC_USING_HOTPATCH
+       if (insn->disp == 0)
+               return 1;
+#else
+       if (insn->disp == MCOUNT_INSN_SIZE / 2)
+               return 1;
+#endif
+#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 */