From d73ffab4361158e6ca29584da9324771471813e2 Mon Sep 17 00:00:00 2001
From: hinus <hinus@163.com>
Date: Thu, 19 Aug 2021 02:22:16 +0800
Subject: [PATCH] Title: A real shell. Issue:
 https://gitee.com/hinus/linux_kernel_011/issues/I469BL    
 https://gitee.com/hinus/linux_kernel_011/issues/I46998 Description: a better
 shell. LTT: /et

---
 tools/tcc/Makefile                        |  4 ++--
 tools/tcc/include/unistd.h                |  2 ++
 tools/tcc/runtime/{write.c => sys_call.c} |  4 ++++
 tools/tcc/tcc                             |  2 +-
 tools/tcc/test/test.c                     | 26 ++++++++++++++---------
 5 files changed, 25 insertions(+), 13 deletions(-)
 rename tools/tcc/runtime/{write.c => sys_call.c} (37%)

diff --git a/tools/tcc/Makefile b/tools/tcc/Makefile
index 8d0e1c4..ff5ba13 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 67ddf62..21f83d2 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 67b09f7..6d252ef 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 624378c..8d2e21c 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 ccc6757..10098a0 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;
-- 
Gitee