bsp,abstract-machine: fix the order of .rti_fn* sections

* now initcall can work successfully, and msh can show prompt

bsp/abstract-machine/Makefile

@@ -6,6 +6,7 @@ RTCONFIG_H = rtconfig.h
 NAME = rtthread
 SRCS = $(shell find src -name "*.c")
 CFLAGS += -DHAVE_CCONFIG_H -D__RTTHREAD__
+LDFLAGS += extra.ld
 -include $(FILE_MK)
 include $(AM_HOME)/Makefile
 

bsp/abstract-machine/extra.ld

@@ -0,0 +1,19 @@
+SECTIONS {
+  . = ALIGN(8);
+
+  .myextra : {
+    /* section information for initial. */
+    . = ALIGN(8);
+    __rt_init_start = .;
+    KEEP(*(SORT(.rti_fn*)))
+    __rt_init_end = .;
+    . = ALIGN(8);
+
+    __rt_utest_tc_tab_start = .;
+    KEEP(*(UtestTcTab))
+    __rt_utest_tc_tab_end = .;
+  }
+  end = .;
+  _end = .;
+  _heap_start = ALIGN(0x1000);
+}

bsp/abstract-machine/src/init.c

@@ -1,6 +1,9 @@
 #include <am.h>
 #include <rtthread.h>
 
+void *__fsymtab_start = NULL;
+void *__fsymtab_end = NULL;
+
 #define RT_HW_HEAP_BEGIN heap.start
 #define RT_HW_HEAP_END heap.end
 

bsp/abstract-machine/src/libc.c

@@ -0,0 +1,9 @@
+#include <klib.h>
+
+char *strchr(const char *s, int c) {
+  assert(0);
+}
+
+char *strstr(const char *haystack, const char *needle) {
+  assert(0);
+}