Linker script from upstream ish

link.ld

@@ -1,26 +1,80 @@
 OUTPUT_ARCH(riscv)
 ENTRY(_start)
 
-SECTIONS {
+SECTIONS
+{
+  /*
+   * ensure that entry.S / _entry is at 0x80000000,
+   * where qemu's -kernel jumps.
+   */
   . = 0x80000000;
 
+  /*
+   * This section contains the code. This is, the machine language instructions
+   * that will be executed by the processor. In here we will find symbols
+   * that reference the functions in your object file.
+   */
   .text : {
+    /* Match any section that starts with .text. */
     *(.text*)
+
+    /* Align the next section to a 4KB (page) boundary. */
+    . = ALIGN(0x1000);
+
+    /* Put the trampoline code here. */
+    _trampoline = .;
+
+    /* Match any section that starts with .trampsec. */
+    *(trampsec)
+
+    /* Align the next section to a 4KB (page) boundary. */
+    . = ALIGN(0x1000);
+
+    /* Assert that the trampoline code is exactly 4KB (page) in size. */
+    /* ASSERT(. - _trampoline == 0x1000, "error: trampoline larger than one page"); */
+
+    /* Define symbol etext to be the current location. */
+    PROVIDE(etext = .);
   } :text
 
-  .bss : {
+  /*
-    *(.bss*)
+   * This contains any data that is marked as read only.
-    *(COMMON)
+   * It is not unusual to find this data interleaved with the text section.
+   */
+  .rodata : {
+    /* Align on quadword boundary. */
+    . = ALIGN(16);
+    *(.srodata*) /* do not need to distinguish this from .rodata */
+    . = ALIGN(16);
+    *(.rodata*)
   }
 
+  /*
+   * This section contains initialized global and static variables.
+   * Any global object that has been explicitly initialized to a value different than zero.
+   */
   .data : {
-    *(.data)
+    . = ALIGN(16);
+    *(.sdata*) /* do not need to distinguish this from .data */
+    . = ALIGN(16);
+    *(.data*)
   }
 
-  /DISCARD/ : {
+  /*
-    *(.eh_frame)
+   * Contains all uninitialized global and static var iables. These are usually
-    *(.comment)
+   * zeroed out by the startup code before we reach the main function. However,
+   * In an embedded system we usually provide our own startup code, which means
+   * we need to remember to do this ourselves.
+   */
+  .bss : {
+    . = ALIGN(16);
+    *(.sbss*) /* do not need to distinguish this from .bss */
+    . = ALIGN(16);
+    *(.bss*)
   }
+
+  /* Define symbol end as current location, note that this is not aligned, see vm.c */
+  PROVIDE(end = .);
 }
 
 PHDRS {