Added simple_main

runtime/mains/dev/linker.ld

@@ -0,0 +1,48 @@
+/* ---- Original Script: /opt/riscv32i/riscv32-unknown-elf/lib/ldscripts/elf32lriscv.x ---- */
+/* Default linker script, for normal executables */
+/* Copyright (C) 2014-2017 Free Software Foundation, Inc.
+   Copying and distribution of this script, with or without modification,
+   are permitted in any medium without royalty provided the copyright
+   notice and this notice are preserved.  */
+OUTPUT_FORMAT("elf32-littleriscv", "elf32-littleriscv",
+	      "elf32-littleriscv")
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+SECTIONS
+{
+  . = 0x80000000;
+  .text           :
+  {
+    *(.text)
+    *(.text.unlikely .text.*_unlikely .text.unlikely.*)
+    *(.text.exit .text.exit.*)
+    *(.text.startup .text.startup.*)
+    *(.text.hot .text.hot.*)
+    *(.stub .text.* .gnu.linkonce.t.*)
+    /* .gnu.warning sections are handled specially by elf32.em.  */
+    *(.gnu.warning)
+  }
+  .init           :
+  {
+    KEEP (*(SORT_NONE(.init)))
+  }
+  .plt            : { *(.plt) }
+  .iplt           : { *(.iplt) }
+  .fini           :
+  {
+    KEEP (*(SORT_NONE(.fini)))
+  }
+  PROVIDE (__etext = .);
+  PROVIDE (_etext = .);
+  PROVIDE (etext = .);
+  PROVIDE (_edata = .);
+  PROVIDE (_end = .);
+  PROVIDE (__global_pointer$ = .);
+
+  . = 0x81000000;
+  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+  .rodata1        : { *(.rodata1) }
+  . = 0x82000000;
+  .comment        : { *(.comment) }
+
+}