Implement AOT support for RISCV (#649)

Enable RISCV AOT support, the supported ABIs are LP64 and LP64D for riscv64, ILP32 and ILP32D for riscv32.
For wamrc:
    use --target=riscv64/riscv32 to specify the target arch of output AOT file,
    use --target-abi=lp64d/lp64/ilp32d/ilp32 to specify the target ABI,
    if --target-abi isn't specified, by default lp64d is used for riscv64, and ilp32d is used for riscv32.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Co-authored-by: wenyongh <wenyong.huang@intel.com>

product-mini/platforms/nuttx/wamr.mk

@@ -72,27 +72,25 @@ ifeq (${CONFIG_ARCH_FPU},y)
   $(error riscv64 lp64f is unsupported)
 else ifeq (${CONFIG_ARCH_DPFPU}, y)
   CFLAGS += -DBUILD_TARGET_RISCV64_LP64D
-  INVOKE_NATIVE += invokeNative_riscv64_lp64d.s
 else
   CFLAGS += -DBUILD_TARGET_RISCV64_LP64
-  INVOKE_NATIVE += invokeNative_riscv64_lp64.s
 endif
+  INVOKE_NATIVE += invokeNative_riscv.S
 
-  AOT_RELOC :=
+  AOT_RELOC := aot_reloc_riscv.c
 
 else ifeq (${WAMR_BUILD_TARGET}, RISCV32)
 
 ifeq (${CONFIG_ARCH_FPU}, y)
   $(error riscv32 ilp32f is unsupported)
 else ifeq (${CONFIG_ARCH_DPFPU}, y)
-  CFLAGS += -DBUILD_TARGET_RISCV64_ILP32D
-  INVOKE_NATIVE += invokeNative_riscv32_ilp32d.s
+  CFLAGS += -DBUILD_TARGET_RISCV32_ILP32D
 else
-  CFLAGS += -DBUILD_TARGET_RISCV64_ILP32
-  INVOKE_NATIVE += invokeNative_riscv32_ilp32.s
+  CFLAGS += -DBUILD_TARGET_RISCV32_ILP32
 endif
 
-  AOT_RELOC :=
+  INVOKE_NATIVE += invokeNative_riscv.S
+  AOT_RELOC := aot_reloc_riscv.c
 
 else
   $(error Build target is unsupported)
@@ -182,7 +180,8 @@ CFLAGS += -Wno-strict-prototypes -Wno-shadow -Wno-unused-variable
 CFLAGS += -Wno-int-conversion -Wno-implicit-function-declaration
 
 CFLAGS += -I${CORE_ROOT} \
-		      -I${IWASM_ROOT}/include \
+          -I${IWASM_ROOT}/include \
+          -I${IWASM_ROOT}/interpreter \
           -I${IWASM_ROOT}/common \
           -I${IWASM_ROOT}/libraries/thread-mgr \
           -I${SHARED_ROOT}/include \
@@ -218,7 +217,8 @@ CSRCS += nuttx_platform.c \
          wasm_runtime_common.c \
          wasm_native.c \
          wasm_exec_env.c \
-         wasm_memory.c
+         wasm_memory.c \
+         wasm_c_api.c
 
 ASRCS += ${INVOKE_NATIVE}