1 files changed, 111 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
new file mode 100644
index 000000000..e3d1f377b
--- /dev/null
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_FTRACE
+#define _ASM_POWERPC_FTRACE
+
+#include <asm/types.h>
+
+#ifdef CONFIG_FUNCTION_TRACER
+#define MCOUNT_ADDR		((unsigned long)(_mcount))
+#define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
+
+#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
+
+#ifndef __ASSEMBLY__
+extern void _mcount(void);
+
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+       /* relocation of mcount call site is the same as the address */
+       return addr;
+}
+
+unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
+				    unsigned long sp);
+
+struct dyn_arch_ftrace {
+	struct module *mod;
+};
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
+struct ftrace_regs {
+	struct pt_regs regs;
+};
+
+static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
+{
+	/* We clear regs.msr in ftrace_call */
+	return fregs->regs.msr ? &fregs->regs : NULL;
+}
+
+static __always_inline void ftrace_instruction_pointer_set(struct ftrace_regs *fregs,
+							   unsigned long ip)
+{
+	regs_set_return_ip(&fregs->regs, ip);
+}
+
+struct ftrace_ops;
+
+#define ftrace_graph_func ftrace_graph_func
+void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
+		       struct ftrace_ops *op, struct ftrace_regs *fregs);
+#endif
+#endif /* __ASSEMBLY__ */
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+#define ARCH_SUPPORTS_FTRACE_OPS 1
+#endif
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#ifndef __ASSEMBLY__
+#ifdef CONFIG_FTRACE_SYSCALLS
+/*
+ * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
+ * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
+ * those.
+ */
+#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
+static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
+{
+	return !strcmp(sym, name) ||
+		(!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
+		(!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
+		(!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
+		(!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
+}
+#endif /* CONFIG_FTRACE_SYSCALLS */
+
+#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
+#include <asm/paca.h>
+
+static inline void this_cpu_disable_ftrace(void)
+{
+	get_paca()->ftrace_enabled = 0;
+}
+
+static inline void this_cpu_enable_ftrace(void)
+{
+	get_paca()->ftrace_enabled = 1;
+}
+
+/* Disable ftrace on this CPU if possible (may not be implemented) */
+static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
+{
+	get_paca()->ftrace_enabled = ftrace_enabled;
+}
+
+static inline u8 this_cpu_get_ftrace_enabled(void)
+{
+	return get_paca()->ftrace_enabled;
+}
+
+void ftrace_free_init_tramp(void);
+#else /* CONFIG_PPC64 */
+static inline void this_cpu_disable_ftrace(void) { }
+static inline void this_cpu_enable_ftrace(void) { }
+static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
+static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
+static inline void ftrace_free_init_tramp(void) { }
+#endif /* CONFIG_PPC64 */
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_POWERPC_FTRACE */