riscv/ftrace: Add ARCH_SUPPORTS_FTRACE_OPS support

Cc: Greentime Hu <greentime@andestech.com>
Signed-off-by: Alan Kao <alankao@andestech.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h
index 078743a..fedadc4 100644 (file)
--- a/arch/riscv/include/asm/ftrace.h
+++ b/arch/riscv/include/asm/ftrace.h
@@ -9,6 +9,7 @@
 #define HAVE_FUNCTION_GRAPH_FP_TEST
 #endif
 
+#define ARCH_SUPPORTS_FTRACE_OPS 1
 #ifndef __ASSEMBLY__
 void _mcount(void);
 static inline unsigned long ftrace_call_adjust(unsigned long addr)

diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S
index 739e07a..6bbc3f8 100644 (file)
--- a/arch/riscv/kernel/mcount-dyn.S
+++ b/arch/riscv/kernel/mcount-dyn.S
@@ -74,9 +74,12 @@ ENTRY(ftrace_caller)
        /*
         * a0: the address in the caller when calling ftrace_caller
         * a1: the caller's return address
+        * a2: the address of global variable function_trace_op
         */
        ld      a1, -8(s0)
        addi    a0, ra, -MCOUNT_INSN_SIZE
+       la      t5, function_trace_op
+       ld      a2, 0(t5)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
        /*