diff --git a/porting/liteos_m/kernel/BUILD.gn b/porting/liteos_m/kernel/BUILD.gn
index 891d8f2e4d26c9d1eae953681bca9f06a5046c9d..d55251b9d470228b4d3603951346608299e4517b 100644
--- a/porting/liteos_m/kernel/BUILD.gn
+++ b/porting/liteos_m/kernel/BUILD.gn
@@ -59,6 +59,7 @@ static_library(libc) {
     "src/internal/shgetc.c",
     "src/locale/__lctrans.c",
     "src/locale/c_locale.c",
+    "src/locale/iconv.c",
     "src/locale/langinfo.c",
     "src/misc/dirname.c",
     "src/misc/realpath.c",
@@ -110,21 +111,19 @@ static_library(libc) {
     "src/stdio/stderr.c",
     "src/stdio/stdin.c",
     "src/stdio/stdout.c",
+    "src/stdio/ungetc.c",
     "src/stdio/vfprintf.c",
     "src/stdio/vsnprintf.c",
     "src/stdio/vsprintf.c",
     "src/stdlib/abs.c",
     "src/stdlib/atof.c",
     "src/stdlib/atoi.c",
-
-    #"src/stdlib/strtol.c",
-    "src/locale/iconv.c",
-    "src/stdio/ungetc.c",
     "src/stdlib/atol.c",
     "src/stdlib/atoll.c",
     "src/stdlib/bsearch.c",
     "src/stdlib/llabs.c",
     "src/stdlib/strtod.c",
+    "src/stdlib/strtol.c",
     "src/string/memchr.c",
     "src/string/memcmp.c",
     "src/string/memcpy.c",
@@ -188,9 +187,21 @@ static_library(libm) {
   sources = [
     "src/math/__fpclassify.c",
     "src/math/__fpclassifyl.c",
+    "src/math/__math_divzero.c",
+    "src/math/__math_divzerof.c",
+    "src/math/__math_invalid.c",
+    "src/math/__math_invalidf.c",
+    "src/math/__math_oflow.c",
+    "src/math/__math_oflowf.c",
+    "src/math/__math_uflow.c",
+    "src/math/__math_uflowf.c",
+    "src/math/__math_xflow.c",
+    "src/math/__math_xflowf.c",
     "src/math/__signbit.c",
     "src/math/__signbitl.c",
+    "src/math/arm/fabs.c",
     "src/math/exp_data.c",
+    "src/math/floor.c",
     "src/math/frexp.c",
     "src/math/frexpl.c",
     "src/math/log.c",
diff --git a/porting/liteos_m/kernel/src/math/__math_divzero.c b/porting/liteos_m/kernel/src/math/__math_divzero.c
new file mode 100644
index 0000000000000000000000000000000000000000..59d2135001ca33e1de10875ca05b361cf455a3ae
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_divzero.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+double __math_divzero(uint32_t sign)
+{
+	return fp_barrier(sign ? -1.0 : 1.0) / 0.0;
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_divzerof.c b/porting/liteos_m/kernel/src/math/__math_divzerof.c
new file mode 100644
index 0000000000000000000000000000000000000000..ce046f3e320a99e001f260bb08a46b4775d93ce5
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_divzerof.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+float __math_divzerof(uint32_t sign)
+{
+	return fp_barrierf(sign ? -1.0f : 1.0f) / 0.0f;
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_invalid.c b/porting/liteos_m/kernel/src/math/__math_invalid.c
new file mode 100644
index 0000000000000000000000000000000000000000..177404900d161e4224c1424ec59f08353269d114
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_invalid.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+double __math_invalid(double x)
+{
+	return (x - x) / (x - x);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_invalidf.c b/porting/liteos_m/kernel/src/math/__math_invalidf.c
new file mode 100644
index 0000000000000000000000000000000000000000..357d4b121176783974a366e10f68c4d749050cdf
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_invalidf.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+float __math_invalidf(float x)
+{
+	return (x - x) / (x - x);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_oflow.c b/porting/liteos_m/kernel/src/math/__math_oflow.c
new file mode 100644
index 0000000000000000000000000000000000000000..c85dbf982a0db036a7edf0a1bb32c74de208b185
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_oflow.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+double __math_oflow(uint32_t sign)
+{
+	return __math_xflow(sign, 0x1p769);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_oflowf.c b/porting/liteos_m/kernel/src/math/__math_oflowf.c
new file mode 100644
index 0000000000000000000000000000000000000000..fa7d06208e41da7ad2ba0fbe912af70d4bf82d95
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_oflowf.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+float __math_oflowf(uint32_t sign)
+{
+	return __math_xflowf(sign, 0x1p97f);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_uflow.c b/porting/liteos_m/kernel/src/math/__math_uflow.c
new file mode 100644
index 0000000000000000000000000000000000000000..b90594aee14e54144ad4c1695a446fbba12395a4
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_uflow.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+double __math_uflow(uint32_t sign)
+{
+	return __math_xflow(sign, 0x1p-767);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_uflowf.c b/porting/liteos_m/kernel/src/math/__math_uflowf.c
new file mode 100644
index 0000000000000000000000000000000000000000..94d50f2bf12973f9a1d37ee613cdb7299afc12a4
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_uflowf.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+float __math_uflowf(uint32_t sign)
+{
+	return __math_xflowf(sign, 0x1p-95f);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_xflow.c b/porting/liteos_m/kernel/src/math/__math_xflow.c
new file mode 100644
index 0000000000000000000000000000000000000000..744203c4c817b02c73c21cd89b7e4e9349433498
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_xflow.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+double __math_xflow(uint32_t sign, double y)
+{
+	return eval_as_double(fp_barrier(sign ? -y : y) * y);
+}
diff --git a/porting/liteos_m/kernel/src/math/__math_xflowf.c b/porting/liteos_m/kernel/src/math/__math_xflowf.c
new file mode 100644
index 0000000000000000000000000000000000000000..f2c84784f81f8acdcb734f04f220358a26afb617
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/__math_xflowf.c
@@ -0,0 +1,6 @@
+#include "libm.h"
+
+float __math_xflowf(uint32_t sign, float y)
+{
+	return eval_as_float(fp_barrierf(sign ? -y : y) * y);
+}
diff --git a/porting/liteos_m/kernel/src/math/arm/fabs.c b/porting/liteos_m/kernel/src/math/arm/fabs.c
new file mode 100644
index 0000000000000000000000000000000000000000..f890520a5cd78d38ee3285aba4e179c730f76768
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/arm/fabs.c
@@ -0,0 +1,15 @@
+#include <math.h>
+
+#if __ARM_PCS_VFP
+
+double fabs(double x)
+{
+	__asm__ ("vabs.f64 %P0, %P1" : "=w"(x) : "w"(x));
+	return x;
+}
+
+#else
+
+#include "../fabs.c"
+
+#endif
diff --git a/porting/liteos_m/kernel/src/math/fabs.c b/porting/liteos_m/kernel/src/math/fabs.c
new file mode 100644
index 0000000000000000000000000000000000000000..e8258cfdbcf1a751621a69bac02f0f0f9b22b1cf
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/fabs.c
@@ -0,0 +1,9 @@
+#include <math.h>
+#include <stdint.h>
+
+double fabs(double x)
+{
+	union {double f; uint64_t i;} u = {x};
+	u.i &= -1ULL/2;
+	return u.f;
+}
diff --git a/porting/liteos_m/kernel/src/math/floor.c b/porting/liteos_m/kernel/src/math/floor.c
new file mode 100644
index 0000000000000000000000000000000000000000..14a31cd8c4c549750205369a6fe9e71eec8f71c5
--- /dev/null
+++ b/porting/liteos_m/kernel/src/math/floor.c
@@ -0,0 +1,31 @@
+#include "libm.h"
+
+#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
+#define EPS DBL_EPSILON
+#elif FLT_EVAL_METHOD==2
+#define EPS LDBL_EPSILON
+#endif
+static const double_t toint = 1/EPS;
+
+double floor(double x)
+{
+	union {double f; uint64_t i;} u = {x};
+	int e = u.i >> 52 & 0x7ff;
+	double_t y;
+
+	if (e >= 0x3ff+52 || x == 0)
+		return x;
+	/* y = int(x) - x, where int(x) is an integer neighbor of x */
+	if (u.i >> 63)
+		y = x - toint + toint - x;
+	else
+		y = x + toint - toint - x;
+	/* special case because of non-nearest rounding modes */
+	if (e <= 0x3ff-1) {
+		FORCE_EVAL(y);
+		return u.i >> 63 ? -1 : 0;
+	}
+	if (y > 0)
+		return x + y - 1;
+	return x + y;
+}