[M2351] Support initializing multiple .data/.bss sections with GCC_ARM

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M2351/device/TOOLCHAIN_GCC_ARM/M2351.ld

@@ -150,6 +150,23 @@ SECTIONS
          . = ALIGN(8);
     } > VECTORS
 
+    .copy.table : ALIGN(4)
+    {
+        __copy_table_start__ = .;
+        LONG (LOADADDR(.data))
+        LONG (ADDR(.data))
+        LONG (SIZEOF(.data))
+        __copy_table_end__ = .;
+    } > FLASH
+
+    .zero.table : ALIGN(4)
+    {
+        __zero_table_start__ = .;
+        LONG (ADDR(.bss))
+        LONG (SIZEOF(.bss))
+        __zero_table_end__ = .;
+    } > FLASH
+
     .text :
     {
         *(.text*)

targets/TARGET_NUVOTON/TARGET_M2351/device/startup_M2351.c

@@ -55,11 +55,10 @@ extern void __main(void);
 void __iar_program_start(void);
 #elif defined(__GNUC__)
 extern uint32_t __StackTop;
-extern uint32_t __etext;
-extern uint32_t __data_start__;
-extern uint32_t __data_end__;
-extern uint32_t __bss_start__;
-extern uint32_t __bss_end__;
+extern uint32_t __copy_table_start__;
+extern uint32_t __copy_table_end__;
+extern uint32_t __zero_table_start__;
+extern uint32_t __zero_table_end__;
 
 #if defined(TOOLCHAIN_GCC_ARM)
 extern void _start(void);
@@ -350,26 +349,51 @@ void Reset_Handler(void)
     __iar_program_start();
 
 #elif defined(__GNUC__)
-    uint32_t *src_ind = (uint32_t *) &__etext;
-    uint32_t *dst_ind = (uint32_t *) &__data_start__;
-    uint32_t *dst_end = (uint32_t *) &__data_end__;
-
-    /* Move .data section from ROM to RAM */
-    if (src_ind != dst_ind) {
-        for (; dst_ind < dst_end;) {
-            *dst_ind ++ = *src_ind ++;
+    /* Move (multiple) .data section(s) from ROM to RAM */
+    {
+        /* Struct of copy table entry which must match linker script */
+        typedef struct copy_table_entry_ {
+            uint32_t    src;            // Address to copy from
+            uint32_t    dst;            // Address to copy to
+            uint32_t    size;           // Copy size in bytes
+        } copy_table_entry;
+
+        copy_table_entry *copy_table_ind = (copy_table_entry *) &__copy_table_start__;
+        copy_table_entry *copy_table_end = (copy_table_entry *) &__copy_table_end__;
+
+        for (; copy_table_ind != copy_table_end; copy_table_ind ++) {
+            uint32_t *src_ind = (uint32_t *) copy_table_ind->src;
+            uint32_t *src_end = (uint32_t *) (copy_table_ind->src + copy_table_ind->size);
+            uint32_t *dst_ind = (uint32_t *) copy_table_ind->dst;
+            if (src_ind != dst_ind) {
+                for (; src_ind < src_end;) {
+                    *dst_ind ++ = *src_ind ++;
+                }
+            }
         }
     }
-   
-    /* Initialize .bss section to zero */
-    dst_ind = (uint32_t *) &__bss_start__;
-    dst_end = (uint32_t *) &__bss_end__;
-    if (dst_ind != dst_end) {
-        for (; dst_ind < dst_end;) {
-            *dst_ind ++ = 0;
+
+    /* Initialize (multiple) .bss sections to zero */
+    {
+        /* Struct of zero table entry which must match linker script */
+        typedef struct zero_table_entry_ {
+            uint32_t    start;          // Address to start zero'ing
+            uint32_t    size;           // Zero size in bytes
+        } zero_table_entry;
+
+        zero_table_entry *zero_table_ind = (zero_table_entry *) &__zero_table_start__;
+        zero_table_entry *zero_table_end = (zero_table_entry *) &__zero_table_end__;
+
+        for (; zero_table_ind != zero_table_end; zero_table_ind ++) {
+            uint32_t *dst_ind = (uint32_t *) zero_table_ind->start;
+            uint32_t *dst_end = (uint32_t *) (zero_table_ind->start + zero_table_ind->size);
+
+            for (; dst_ind < dst_end; ) {
+                *dst_ind ++ = 0;
+            }
         }
     }
-    
+
     _start();
 
 #endif