add support of arm standard c library, support using armcc to compile lua

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2429 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/external/lua/README.TXT

@@ -2,7 +2,7 @@
 
 ## 简介
 RT-Thread中的Lua修改自[eLua](http://www.eluaproject.net/)的Lua-5.1.4版本。
-采用gcc工具链时，Lua依赖于newlib库，其它工具链暂时还不支持。
+采用gcc工具链时，Lua依赖于newlib库，采用keil时，Lua依赖于arm的标准c库。
 启动lua的RAM占用情况
     - 标准的lua        17.1904296875 KB
     - 优化的lua        5.01953125 KB
@@ -25,10 +25,11 @@ RT-Thread中的Lua修改自[eLua](http://www.eluaproject.net/)的Lua-5.1.4版本
 
 ## 开发相关
     - 采用gcc工具链时，依赖于newlib，需在rtconfig.h中定义RT_USING_NEWLIB  
+      采用keil工具链时，依赖于arm的标准c库，需在rtconfig.h中定义RT_USING_ARM_LIBC
     - 开启编译器对C99的支持，如MDK中，在C/C++选项的Misc Controls输入框中添加--c99
-    - 需要在链接脚本中定义_stext和_etext，.ordata*放在两者之间。
+    - 使用gcc时，需要在链接脚本中定义_stext和_etext，.ordata*放在两者之间。用于判断数据是read-only和writable  
-      用于判断数据是read-only和writable。MDK中如何实现？？
+      使用keil时，需要在分散加载文件中把rodata放在ER_IROM1区
-    - 添加新的模块，参见lexample.c
+    - 添加新的模块，参见exlibs/lexamplelib.c
     
 ## 目录说明
     - lua：从eLua获得Lua-5.1.4版本代码

components/external/lua/lua/compiler.h

@@ -0,0 +1,43 @@
+/**
+ * define start/end address of ro data.
+ * different compiler with different implementation.
+ */
+
+#ifndef __COMPILER_H__
+#define __COMPILER_H__
+
+#if defined(__CC_ARM)       // armcc
+
+#warning "Please check scatter file to ensure rodata is in ER_IROM1 region."
+
+/* symbols reference to the scatter file */
+extern char Image$$ER_IROM1$$Base;
+extern char Image$$ER_IROM1$$Limit;
+
+#define RODATA_START_ADDRESS        (&Image$$ER_IROM1$$Base)
+#define RODATA_END_ADDRESS          (&Image$$ER_IROM1$$Limit)
+
+#elif defined(__GNUC__)     // gcc
+
+#warning "Please check linker script to ensure rodata is between _stext and _etext."
+
+/* symbols defined in linker script */
+extern char _stext;
+extern char _etext;
+
+#define RODATA_START_ADDRESS        (&_stext)
+#define RODATA_END_ADDRESS          (&_etext)
+
+#else                       // other compilers
+
+/* Firstly, modify rodata's start/end address. Then, comment the line below */
+#error "Please modify RODATA_START_ADDRESS and RODATA_END_ADDRESS below */
+
+/* Perhaps you can use start/end address of flash */
+#define RODATA_START_ADDRESS        ((char*)0x08000000)
+#define RODATA_END_ADDRESS          ((char*)0x08080000)
+
+#endif
+
+#endif // __COMPILER_H__
+

components/external/lua/lua/lrotable.c

@@ -126,9 +126,10 @@ void luaR_getcstr(char *dest, const TString *src, size_t maxsize) {
 
 /* Return 1 if the given pointer is a rotable */
 #ifdef LUA_META_ROTABLES
-extern char _stext;
+
-extern char _etext;
+#include "compiler.h"
+
 int luaR_isrotable(void *p) {
-  return &_stext <= ( char* )p && ( char* )p <= &_etext;
+  return RODATA_START_ADDRESS <= (char*)p && (char*)p <= RODATA_END_ADDRESS;
 }
 #endif

components/external/lua/lua/lstring.c

@@ -100,14 +100,14 @@ static TString *luaS_newlstr_helper (lua_State *L, const char *str, size_t l, in
   return newlstr(L, str, l, h, readonly);  /* not found */
 }
 
-extern char _stext;
-extern char _etext;
-
 static int lua_is_ptr_in_ro_area(const char *p) {
 #ifdef LUA_CROSS_COMPILER
   return 0;
 #else
-  return p >= &_stext && p <= &_etext;
+
+#include "compiler.h"
+
+  return p >= RODATA_START_ADDRESS && p <= RODATA_END_ADDRESS;
 #endif
 }
 

components/libc/armlibc/Sconscript

@@ -0,0 +1,16 @@
+Import('rtconfig')
+from building import *
+
+if GetDepend('RT_USING_ARM_LIBC') and rtconfig.CROSS_TOOL != 'keil':
+    print '================ERROR=============================='
+    print 'Please use ARM CC compiler if using ARM C library'
+    print '==================================================='
+    exit(0)
+
+cwd = GetCurrentDir()
+src	= Glob('*.c')
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, depend = ['RT_USING_ARM_LIBC'], CPPPATH = CPPPATH)
+
+Return('group')

components/libc/armlibc/mem_std.c

@@ -0,0 +1,19 @@
+
+#include "rtthread.h"
+
+#pragma import(__use_no_heap)
+
+void * malloc(int n)
+{
+    return rt_malloc(n);
+}
+
+void * realloc(void *rmem, rt_size_t newsize)
+{
+    return rt_realloc(rmem, newsize);
+}
+
+void free(void *rmem)
+{
+    rt_free(rmem);
+}

components/libc/armlibc/stubs.c

@@ -0,0 +1,146 @@
+/**
+ * reimplement arm c library's basic functions
+ */
+
+#include <string.h>
+#include <rt_sys.h>
+
+#include "rtthread.h"
+
+#pragma import(__use_no_semihosting_swi)
+
+int remove(const char *filename)
+{
+    RT_ASSERT(0);
+    for(;;);
+}
+
+/* rename() */
+
+int system(const char *string)
+{
+    RT_ASSERT(0);
+    for(;;);	
+}
+
+/* Standard IO device handles. */
+#define STDIN       1
+#define STDOUT      2
+#define STDERR      3
+
+/* Standard IO device name defines. */
+const char __stdin_name[]  = "STDIN";
+const char __stdout_name[] = "STDOUT";
+const char __stderr_name[] = "STDERR";
+
+FILEHANDLE _sys_open(const char *name, int openmode)
+{
+    /* Register standard Input Output devices. */
+    if (strcmp(name, __stdin_name) == 0)
+        return (STDIN);
+    if (strcmp(name, __stdout_name) == 0)
+        return (STDOUT);
+    if (strcmp(name, __stderr_name) == 0)
+        return (STDERR);
+
+#ifndef RT_USING_DFS
+    return 0;
+#else
+    /* TODO: adjust open file mode */
+    return open(name, openmode, 0);
+#endif
+}
+
+int _sys_close(FILEHANDLE fh)
+{
+#ifndef RT_USING_DFS
+    return 0;
+#else
+    if (fh < 3)
+        return 0;
+    
+    return close(fh);
+#endif
+}
+
+int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
+{
+    if (fh == STDIN)
+    {
+        /* TODO */
+        
+        return 0;
+    }
+    
+#ifndef RT_USING_DFS
+    return 0;
+#else
+    return read(fh, buf, len);
+#endif
+}
+
+int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
+{
+    if ((fh == STDOUT) || (fh == STDERR))
+    {
+#ifndef RT_USING_CONSOLE
+        return 0;
+#else
+        rt_device_t console_device;
+        extern rt_device_t rt_console_get_device(void);
+
+        console_device = rt_console_get_device();
+        if (console_device != 0) rt_device_write(console_device, 0, buf, len);
+        return len;
+#endif
+    }
+    
+#ifndef RT_USING_DFS
+    return 0;
+#else
+    return write(fh, buf, len);
+#endif
+}
+
+int _sys_seek(FILEHANDLE fh, long pos)
+{
+#ifndef RT_USING_DFS
+    return 0;
+#else
+    /* TODO: adjust last parameter */
+    return lseek(fh, pos, 0);
+#endif
+}
+
+int _sys_tmpnam(char *name, int fileno, unsigned maxlength)
+{
+    return 0;
+}
+
+char *_sys_command_string(char *cmd, int len)
+{
+    return cmd;
+}
+
+void _ttywrch(int ch)
+{
+    
+}
+
+void _sys_exit(int return_code)
+{
+    while (1);
+}
+
+long _sys_flen(FILEHANDLE fh)
+{
+    return 0;
+}
+
+int _sys_istty(FILEHANDLE fh)
+{
+    return 0;
+}
+
+
+