feature: 补充M核C库接口

close: #I4MGIJ
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: Ifb5e691b1ca939ae4806316908d6044b2f98d591

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",

porting/liteos_m/kernel/src/math/__math_divzero.c

+#include "libm.h"
+
+double __math_divzero(uint32_t sign)
+{
+	return fp_barrier(sign ? -1.0 : 1.0) / 0.0;
+}

porting/liteos_m/kernel/src/math/__math_divzerof.c

+#include "libm.h"
+
+float __math_divzerof(uint32_t sign)
+{
+	return fp_barrierf(sign ? -1.0f : 1.0f) / 0.0f;
+}

porting/liteos_m/kernel/src/math/__math_invalid.c

+#include "libm.h"
+
+double __math_invalid(double x)
+{
+	return (x - x) / (x - x);
+}

porting/liteos_m/kernel/src/math/__math_invalidf.c

+#include "libm.h"
+
+float __math_invalidf(float x)
+{
+	return (x - x) / (x - x);
+}

porting/liteos_m/kernel/src/math/__math_oflow.c

+#include "libm.h"
+
+double __math_oflow(uint32_t sign)
+{
+	return __math_xflow(sign, 0x1p769);
+}

porting/liteos_m/kernel/src/math/__math_oflowf.c

+#include "libm.h"
+
+float __math_oflowf(uint32_t sign)
+{
+	return __math_xflowf(sign, 0x1p97f);
+}

porting/liteos_m/kernel/src/math/__math_uflow.c

+#include "libm.h"
+
+double __math_uflow(uint32_t sign)
+{
+	return __math_xflow(sign, 0x1p-767);
+}

porting/liteos_m/kernel/src/math/__math_uflowf.c

+#include "libm.h"
+
+float __math_uflowf(uint32_t sign)
+{
+	return __math_xflowf(sign, 0x1p-95f);
+}

porting/liteos_m/kernel/src/math/__math_xflow.c

+#include "libm.h"
+
+double __math_xflow(uint32_t sign, double y)
+{
+	return eval_as_double(fp_barrier(sign ? -y : y) * y);
+}

porting/liteos_m/kernel/src/math/__math_xflowf.c

+#include "libm.h"
+
+float __math_xflowf(uint32_t sign, float y)
+{
+	return eval_as_float(fp_barrierf(sign ? -y : y) * y);
+}

porting/liteos_m/kernel/src/math/arm/fabs.c

+#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

porting/liteos_m/kernel/src/math/fabs.c

+#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;
+}

porting/liteos_m/kernel/src/math/floor.c

+#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;
+}