diff --git a/tools/tcc/Makefile b/tools/tcc/Makefile
index 8d0e1c42b14d540052dbabc5cf65568d85af85e3..ff5ba13afabebfbe339e938a2463f1f1debc5448 100644
--- a/tools/tcc/Makefile
+++ b/tools/tcc/Makefile
@@ -1,13 +1,13 @@
 AR  	:= ar
 GCC		:= gcc
 CCFLAG 	:= -m32 -I./include -ffreestanding -fno-pic -Wall -fomit-frame-pointer -fno-stack-protector -c
-OBJS	:= write.o errno.o printf.o vsprintf.o string.o crt0.o
+OBJS	:= sys_call.o errno.o printf.o vsprintf.o string.o crt0.o
 
 libc.a: $(OBJS)
 	$(AR) rcs $@ $^
 	sync
 
-write.o: runtime/write.c
+sys_call.o: runtime/sys_call.c
 	$(GCC) $(CCFLAG) -o $@ $<
 
 errno.o: runtime/errno.c
diff --git a/tools/tcc/include/unistd.h b/tools/tcc/include/unistd.h
index 67ddf62e064ebb914eb96ce51438a1a4b61ab03c..21f83d22f2d6cf991538ccb3d7d0844917805560 100644
--- a/tools/tcc/include/unistd.h
+++ b/tools/tcc/include/unistd.h
@@ -150,5 +150,7 @@ __asm__ volatile("int $0x80\n\r"\
 extern int errno;
 
 int write(int fildes, const char * buf, off_t count);
+int read(int fildes, const char * buf, off_t count);
+int rmdir(const char* pathname);
 
 #endif
diff --git a/tools/tcc/runtime/write.c b/tools/tcc/runtime/sys_call.c
similarity index 37%
rename from tools/tcc/runtime/write.c
rename to tools/tcc/runtime/sys_call.c
index 67b09f7a948f19b0147e8a5e2b36d9e45c55c946..6d252efb5081fc8e81151fbdc7fb948cd531b03e 100644
--- a/tools/tcc/runtime/write.c
+++ b/tools/tcc/runtime/sys_call.c
@@ -3,3 +3,7 @@
 
 _syscall3(int,write,int,fd,const char *,buf,off_t,count)
 _syscall1(int,exit,int,fd);
+_syscall3(int,read,int,fd,const char *,buf,off_t,count)
+_syscall2(int, mkdir, const char *, pathname, mode_t, mode)
+_syscall1(int, rmdir, const char *, pathname)
+_syscall1(int, chdir, const char *, filename)
diff --git a/tools/tcc/tcc b/tools/tcc/tcc
index 624378c27e5eb8098f589b769c5a1016cbe81a37..8d2e21c152842cc4adc40407eac7b4e952949c3a 100755
--- a/tools/tcc/tcc
+++ b/tools/tcc/tcc
@@ -4,4 +4,4 @@ filename=$1
 objfile=${filename/".c"/".o"}
 echo ${filename/".c"/".o"}
 gcc -c -fno-pic -m32 -ffreestanding -I./include -o $objfile $filename
-ld -M -T linkerscript/a.out.lds linkerscript/a.out.header $objfile libc.a -o $2 > test.map
+ld -e _start -M -T linkerscript/a.out.lds linkerscript/a.out.header $objfile libc.a -o $2 > test.map
diff --git a/tools/tcc/test/test.c b/tools/tcc/test/test.c
index ccc6757dbf9123a2de5eaabcaf3129e9f6d038dd..10098a0c397371448345c426e4ecbc2bf54969d4 100644
--- a/tools/tcc/test/test.c
+++ b/tools/tcc/test/test.c
@@ -1,17 +1,23 @@
 #include <stdio.h>
+#include <string.h>
+#include <unistd.h>
 
+#define MAX_LEN 128
+
+char buf[MAX_LEN];
 int main(int argc, char** argv, char** envp) {
-    printf("argc is %d\n", argc);
-    printf("argv:\n");
-    while (*argv) {
-        printf("%s\n", *argv);
-        argv++;
-    }
+    int i;
 
-    printf("envp:\n");
-    while (*envp) {
-        printf("%s\n", *envp);
-        envp++;
+    while (1) {
+        printf(">>>");
+        i = read(0, buf, MAX_LEN);
+        buf[i-1] = '\0';
+        if (strcmp(buf, "exit") == 0) {
+            break;
+        }
+        else {
+            printf("%s\n", buf);
+        }
     }
 
     return 0;