arm64: ftrace: Add system call tracepoint

[cascardo/linux.git] / arch / arm64 / include / asm / ftrace.h

diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
index 41e8670..c5534fa 100644 (file)
--- a/arch/arm64/include/asm/ftrace.h
+++ b/arch/arm64/include/asm/ftrace.h
@@ -17,6 +17,8 @@
 #define MCOUNT_INSN_SIZE       AARCH64_INSN_SIZE
 
 #ifndef __ASSEMBLY__
+#include <linux/compat.h>
+
 extern void _mcount(unsigned long);
 extern void *return_address(unsigned int);
 
@@ -36,6 +38,22 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
 }
 
 #define ftrace_return_address(n) return_address(n)
+
+/*
+ * Because AArch32 mode does not share the same syscall table with AArch64,
+ * tracing compat syscalls may result in reporting bogus syscalls or even
+ * hang-up, so just do not trace them.
+ * See kernel/trace/trace_syscalls.c
+ *
+ * x86 code says:
+ * If the user realy wants these, then they should use the
+ * raw syscall tracepoints with filtering.
+ */
+#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
+static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
+{
+       return is_compat_task();
+}
 #endif /* ifndef __ASSEMBLY__ */
 
 #endif /* __ASM_FTRACE_H */