diff --git a/.vscode/settings.json b/.vscode/settings.json
index 1d046e64..0ff226d2 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -92,7 +92,9 @@
         "stdint.h": "c",
         "syscall.h": "c",
         "fcntl.h": "c",
-        "types.h": "c"
+        "types.h": "c",
+        "string.h": "c",
+        "math.h": "c"
     },
     "C_Cpp.errorSquiggles": "Enabled",
     "esbonio.sphinx.confDir": ""
diff --git a/kernel/syscall/syscall.c b/kernel/syscall/syscall.c
index 03e646f3..b0d2be78 100644
--- a/kernel/syscall/syscall.c
+++ b/kernel/syscall/syscall.c
@@ -362,7 +362,6 @@ uint64_t sys_brk(struct pt_regs *regs)
     if ((int64_t)regs->r8 == -1)
     {
         kdebug("get brk_start=%#018lx", current_pcb->mm->brk_start);
-        return 0;
         return current_pcb->mm->brk_start;
     }
     if ((int64_t)regs->r8 == -2)
@@ -408,12 +407,7 @@ ul sys_ahci_end_req(struct pt_regs *regs)
 // 系统调用的内核入口程序
 void do_syscall_int(struct pt_regs *regs, unsigned long error_code)
 {
-    if(regs->rax == SYS_BRK)
-    {
-        kdebug("is sysbrk");
-        regs->rax = 0xc00000UL;
-        return;
-    }
+    
     ul ret = system_call_table[regs->rax](regs);
     if(regs->rax == SYS_BRK)
         kdebug("brk ret=%#018lx", ret);
diff --git a/user/libs/libc/printf.c b/user/libs/libc/printf.c
index 4002f16d..a1ca5fdf 100644
--- a/user/libs/libc/printf.c
+++ b/user/libs/libc/printf.c
@@ -9,6 +9,22 @@
 static char *write_num(char *str, uint64_t num, int base, int field_width, int precision, int flags);
 static char *write_float_point_num(char *str, double num, int field_width, int precision, int flags);
 
+
+static int skip_and_atoi(const char **s)
+{
+    /**
+     * @brief 获取连续的一段字符对应整数的值
+     * @param:**s 指向 指向字符串的指针 的指针
+     */
+    int ans = 0;
+    while (is_digit(**s))
+    {
+        ans = ans * 10 + (**s) - '0';
+        ++(*s);
+    }
+    return ans;
+}
+
 /**
  * @brief 往屏幕上输出字符串
  *
@@ -138,7 +154,7 @@ int vsprintf(char *buf, const char *fmt, va_list args)
         }
         else if (is_digit(*fmt))
         {
-            field_width = atoi(&fmt);
+            field_width = skip_and_atoi(&fmt);
             if (field_width < 0)
             {
                 field_width = -field_width;
@@ -158,7 +174,7 @@ int vsprintf(char *buf, const char *fmt, va_list args)
             }
             else if is_digit (*fmt)
             {
-                precision = atoi(&fmt);
+                precision = skip_and_atoi(&fmt);
             }
         }
 
diff --git a/user/libs/libc/stdlib.c b/user/libs/libc/stdlib.c
index 94cd5e55..a6af1878 100644
--- a/user/libs/libc/stdlib.c
+++ b/user/libs/libc/stdlib.c
@@ -1,5 +1,6 @@
 #include <libc/unistd.h>
 #include <libc/stdlib.h>
+#include <libc/ctype.h>
 
 int abs(int i)
 {
diff --git a/user/libs/libsystem/syscall.c b/user/libs/libsystem/syscall.c
index 9276c9f4..fc76d1cd 100644
--- a/user/libs/libsystem/syscall.c
+++ b/user/libs/libsystem/syscall.c
@@ -14,15 +14,11 @@ long syscall_invoke(uint64_t syscall_id, uint64_t arg0, uint64_t arg1, uint64_t
         "movq %8, %%r14 \n\t"
         "movq %9, %%r15 \n\t"
         "int $0x80   \n\t"
-        "movq %%rax, %0 \n\t"
-        : "=m"(err_code)
+        // "movq %%rax, %0 \n\t"
+        : "=a"(err_code)
         : "a"(syscall_id), "m"(arg0), "m"(arg1), "m"(arg2), "m"(arg3), "m"(arg4), "m"(arg5), "m"(arg6), "m"(arg7)
         : "memory", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "rcx", "rdx");
     errno = err_code;
-    if (syscall_id == SYS_BRK || syscall_id == SYS_OPEN)
-    {
-        printf("retval = %#018lx\n", (uint64_t)err_code);
-        printf("errcode = %d\n", err_code);
-    }
+    
     return err_code;
 }