add driver/init.c

Signed-off-by: surenyi <surenyi82@163.com>

CMakeLists.txt

@@ -81,6 +81,7 @@ target_sources(${tgt_name} PRIVATE
     driver/libc/strchr.c
     driver/libc/atoi.c
     driver/libc/eabi_compat.c
+    driver/init.c
     driver/vectors.c
     driver/serial.c
     driver/gpio.c
@@ -202,6 +203,7 @@ add_executable(boot
     driver/libc/strchr.c
     driver/libc/crt0.S
     driver/libc/sections.c
+    driver/init.c
     driver/helpers.c
     driver/vectors.c
     driver/serial.c
@@ -211,7 +213,6 @@ add_executable(boot
     driver/flash_if.c
     driver/ymodem.c
     driver/common.c
-    driver/start.c
 )
 
 target_include_directories(boot PRIVATE

driver/init.c

@@ -0,0 +1,56 @@
+#include <stddef.h>
+
+/* {{{ __libc_init_array */
+/* These magic symbols are provided by the linker.  */
+/* clang-format off */
+extern void (*__preinit_array_start[])(void)__attribute__((weak));
+extern void (*__preinit_array_end  [])(void)__attribute__((weak));
+extern void (*__init_array_start   [])(void)__attribute__((weak));
+extern void (*__init_array_end     [])(void)__attribute__((weak));
+/* clang-format on */
+
+static void __empty(void)
+{
+}
+
+/* clang-format off */
+void _init           (void) __attribute__((weak, alias("__empty")));
+/* clang-format on */
+
+/* iterate over all the init routines.  */
+void __libc_init_array(void)
+{
+    size_t count;
+    size_t i;
+
+    count = __preinit_array_end - __preinit_array_start;
+    for (i = 0; i < count; i++)
+        __preinit_array_start[i]();
+
+    _init();
+
+#if !defined(__RTTHREAD__)
+    count = __init_array_end - __init_array_start;
+    for (i = 0; i < count; i++)
+        __init_array_start[i]();
+#endif
+}
+/* }}} */
+
+/* {{{ __libc_fini_array */
+extern void (*__fini_array_start[])(void) __attribute__((weak));
+extern void (*__fini_array_end[])(void) __attribute__((weak));
+void _fini(void) __attribute__((weak, alias("__empty")));
+/* Run all the cleanup routines.  */
+void __libc_fini_array(void)
+{
+    size_t count;
+    size_t i;
+
+    count = __fini_array_end - __fini_array_start;
+    for (i = count; i > 0; i--)
+        __fini_array_start[i - 1]();
+
+    _fini();
+}
+/* }}} */

driver/start.c

@@ -4,69 +4,24 @@
 #include <stddef.h>
 #include "config.h"
 
-/* {{{ __libc_init_array */
 /* These magic symbols are provided by the linker.  */
 /* clang-format off */
-extern void (*__preinit_array_start[])(void)__attribute__((weak));
-extern void (*__preinit_array_end  [])(void)__attribute__((weak));
-extern void (*__init_array_start   [])(void)__attribute__((weak));
-extern void (*__init_array_end     [])(void)__attribute__((weak));
 extern int  main      (void);
 extern void SystemInit(void);
 extern void SystemCoreClockUpdate(void);
+extern void __libc_init_array(void);
+extern void __libc_fini_array(void);
+extern const void *const g_pfnVectors[];
 /* clang-format on */
 
-static void __empty(void)
-{
-}
-
-static int __start(void)
+static int __main(void)
 {
     return main();
 }
 /* clang-format off */
-void _init           (void) __attribute__((weak, alias("__empty")));
-int entry            (void) __attribute__((weak, alias("__start")));
+int entry            (void) __attribute__((weak, alias("__main")));
 /* clang-format on */
 
-/* iterate over all the init routines.  */
-void __libc_init_array (void)
-{
-  size_t count;
-  size_t i;
-
-  count = __preinit_array_end - __preinit_array_start;
-  for (i = 0; i < count; i++)
-    __preinit_array_start[i] ();
-
-  _init ();
-
-#if !defined(__RTTHREAD__)
-  count = __init_array_end - __init_array_start;
-  for (i = 0; i < count; i++)
-    __init_array_start[i] ();
-#endif
-}
-/* }}} */
-
-/* {{{ __libc_fini_array */
-extern void (*__fini_array_start []) (void) __attribute__((weak));
-extern void (*__fini_array_end []) (void) __attribute__((weak));
-void _fini        (void) __attribute__((weak, alias("__empty")));
-/* Run all the cleanup routines.  */
-void __libc_fini_array (void)
-{
-  size_t count;
-  size_t i;
-  
-  count = __fini_array_end - __fini_array_start;
-  for (i = count; i > 0; i--)
-    __fini_array_start[i-1] ();
-
-  _fini ();
-}
-/* }}} */
-
 /* {{{ Reset_Handler */
 extern unsigned int _estack;
 extern unsigned int _sidata;
@@ -75,12 +30,12 @@ extern unsigned int _edata;
 extern unsigned int _sbss;
 extern unsigned int _ebss;
 
-static void do_cpu_boot()
+static void _start()
 {
     unsigned int *dstp, *srcp;
 
     SystemCoreClockUpdate();
-    
+
     srcp = &_sidata;
     dstp = &_sdata;
 
@@ -103,22 +58,19 @@ static void do_cpu_boot()
     __libc_fini_array();
 }
 
-void __attribute__((naked, section(".text.Reset_Handler")))
-Reset_Handler(void)
+void __attribute__((naked, section(".text.Reset_Handler"))) Reset_Handler(void)
 {
+#define VCTOR 0xE000ED08
     SystemInit();
 
-#if defined(BOARD_SYS_BASE)
-#define VCTOR 0xE000ED08
-    *(volatile unsigned int *)(VCTOR) = BOARD_SYS_BASE;
-#undef VCTOR
-#endif
+    /* fix the vector */
+    *(volatile unsigned int *)(VCTOR) = (unsigned int)g_pfnVectors;
 
-    do_cpu_boot();
+    _start();
 
     while (1) {
         __asm volatile("wfe");
     }
+#undef VCTOR
 }
 /* }}} */
-