refactoring fixes

runtime/io/vx_io.c

@@ -0,0 +1,38 @@
+
+#include "vx_io.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vx_print_hex(unsigned f)
+{
+	// vx_print_str(hextoa[f]);
+	if (f < 16)
+	{
+		vx_print_str(hextoa[f]);
+		return;
+	}
+	int temp;
+	int sf = 32;
+	bool start = false;
+	do
+	{
+		temp = (f >> (sf - 4)) & 0xf;
+		if (temp != 0) start = true;
+		if (start) vx_print_str(hextoa[temp]);
+		sf -= 4;
+	} while(sf > 0);
+}
+
+
+void vx_printf(const char * c, unsigned f)
+{
+	vx_print_str(c);
+	vx_print_hex(f);
+	vx_print_str("\n");
+}
+
+#ifdef __cplusplus
+}
+#endif

runtime/io/vx_io.h

@@ -0,0 +1,20 @@
+
+#pragma once
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static char * hextoa[] = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
+void vx_print_hex(unsigned);
+void vx_printf(const char *, unsigned);
+
+void vx_print_str(const char *);
+void vx_printc(unsigned, char c);
+
+
+#ifdef __cplusplus
+}
+#endif

runtime/io/vx_io.s

@@ -0,0 +1,33 @@
+
+
+.type vx_print_str, @function
+.global vx_print_str
+vx_print_str:
+    addi sp, sp, -12
+    sw   ra, 0(sp)
+    sw   a1, 4(sp)
+bl:
+    lbu  a1,0(a0)
+    beqz a1,be
+    jal  vx_printc
+    addi a0, a0, 1
+    j bl
+be:
+    lw   ra, 0(sp)
+    lw   a1, 4(sp)
+    addi sp, sp, 12
+    ret
+
+
+.type vx_printc, @function
+.global vx_printc
+vx_printc:
+    la t0, print_addr
+    lw t0, 0(t0)
+    sw a1, 0(t0)
+    ret
+
+.section .data
+print_addr:
+    .word 0x00010000 
+