From b2b4835718515a377bcb82947bbd9890d7330aea Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 12 Jan 2000 16:38:57 +0000
Subject: Eric Norum <eric@cls.usask.ca> submitted linker script and bsp_specs
 for the gen68360 that let it work with ELF and C++ exceptions.  This was used
 as the basis for changes to EVERY m68k bsp_specs and linkcmds. Before this
 modification is over, the layout of the starting stack, heap, and workspace
 will likely be modified for every m68k BSP. Then they will all be very
 similar.

---
 c/src/lib/libbsp/m68k/efi68k/startup/linkcmds | 171 +++++++++++++++++---------
 1 file changed, 112 insertions(+), 59 deletions(-)

(limited to 'c/src/lib/libbsp/m68k/efi68k/startup')

diff --git a/c/src/lib/libbsp/m68k/efi68k/startup/linkcmds b/c/src/lib/libbsp/m68k/efi68k/startup/linkcmds
index 5fabd9d11b..c01b91a331 100644
--- a/c/src/lib/libbsp/m68k/efi68k/startup/linkcmds
+++ b/c/src/lib/libbsp/m68k/efi68k/startup/linkcmds
@@ -46,68 +46,121 @@ _VBR = 0x200000;		/* location of the VBR table (in RAM) */
 __end_of_ram = 0x240000;
 _copy_data_from_rom = 0;
 
+/*
+ * Declare some sizes.
+ */
+HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
+StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
+
 /*
  * stick everything in ram (of course)
  */
+
 SECTIONS
 {
-  .text :
-  {
-    CREATE_OBJECT_SYMBOLS
-    text_start = .;
-    _text_start = .;
-    *(.text)
-    . = ALIGN (16);
-    *(.eh_fram)
-    . = ALIGN (16);
-
-    etext = ALIGN(0x10);
-    _etext = .;
-    __CTOR_LIST__ = .;
-    LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)
-    *(.ctors)
-    LONG(0)
-    __CTOR_END__ = .;
-    __DTOR_LIST__ = .;
-    LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)
-    *(.dtors)
-    LONG(0)
-    __DTOR_END__ = .;
-    *(.lit)
-    *(.shdata)
-    _endtext = .;
-  } > ram
-  .data :
-  {
-    data_start = .;
-    _data_start = .;
-    _sdata = . ;
-    *(.data)
-    CONSTRUCTORS
-    edata = ALIGN(0x10);
-    _edata = .;
-  } > ram
-  .shbss :
-  {
-    *(.shbss)
-  } > ram
-  .bss :
-  {
-    __bss_start = ALIGN(0x8);
-    bss_start = .;
-    _bss_start = .;
-    *(.bss)
-    *(COMMON)
-    end = .;
-    _end = ALIGN(0x8);
-    __end = ALIGN(0x8);
-  } > ram
-  .stab . (NOLOAD) :
-  {
-    [ .stab ]
-  }
-  .stabstr . (NOLOAD) :
-  {
-    [ .stabstr ]
-  }
+	ram : {
+		. = .;
+	} >ram
+
+        /*
+         * Text, data and bss segments
+         */
+        .text : {
+                *(.text)
+
+		/*
+		 * C++ constructors/destructors
+		 */
+		*(.gnu.linkonce.t.*)
+
+		/*
+		 * Initialization and finalization code.
+     		 *
+     		 * Various files can provide initialization and finalization
+		 * functions.  crtbegin.o and crtend.o are two instances. The
+		 * body of these functions are in .init and .fini sections. We
+		 * accumulate the bodies here, and prepend function prologues
+		 * from crti.o and function epilogues from crtn.o. crti.o must
+		 * be linked first; crtn.o must be linked last.  Because these
+		 * are wildcards, it doesn't matter if the user does not
+		 * actually link against crti.o and crtn.o; the linker won't
+		 * look for a file to match a wildcard.  The wildcard also
+		 * means that it doesn't matter which directory crti.o and
+		 * crtn.o are in. 
+		 */
+		PROVIDE (_init = .);
+		*crti.o(.init)
+		*(.init)
+		*crtn.o(.init)
+		PROVIDE (_fini = .);
+		*crti.o(.fini)
+		*(.fini)
+		*crtn.o(.fini)
+
+		/*
+		 * C++ constructors/destructors
+     		 *
+     		 * gcc uses crtbegin.o to find the start of the constructors
+		 * and destructors so we make sure it is first.  Because this
+		 * is a wildcard, it doesn't matter if the user does not
+		 * actually link against crtbegin.o; the linker won't look for
+		 * a file to match a wildcard.  The wildcard also means that
+		 * it doesn't matter which directory crtbegin.o is in. The
+		 * constructor and destructor list are terminated in
+		 * crtend.o.  The same comments apply to it.
+		 */
+		. = ALIGN (16);
+		*crtbegin.o(.ctors)
+		*(.ctors)
+		*crtend.o(.ctors)
+		*crtbegin.o(.dtors)
+		*(.dtors)
+		*crtend.o(.dtors)
+
+		/*
+		 * Exception frame info
+		 */
+		. = ALIGN (16);
+		*(.eh_frame)
+
+		/*
+		 * Read-only data
+		 */
+		. = ALIGN (16);
+		_rodata_start = . ;
+		*(.rodata)
+		*(.gnu.linkonce.r*)
+
+                 . = ALIGN (16);
+                PROVIDE (_etext = .);
+        } >ram
+        .data : {
+                PROVIDE (_copy_start = .);
+                *(.data)
+		*(.gnu.linkonce.d*)
+		*(.gcc_except_table)
+                . = ALIGN (16);
+                PROVIDE (_edata = .);
+                PROVIDE (_copy_end = .);
+        } >ram
+        .bss : {
+                PROVIDE (_bss_start = .);
+                PROVIDE (_clear_start = .);
+                *(.bss)
+                *(COMMON)
+                . = ALIGN (16);
+                PROVIDE (end = .);
+
+                . += StackSize;
+                PROVIDE (_stack_init = .);
+
+                . = ALIGN (16);
+                PROVIDE (_HeapStart = .);
+                . += HeapSize;
+                PROVIDE (_HeapEnd = .);
+
+                clear_end = .;
+
+                PROVIDE (_WorkspaceBase = .);
+        } >ram
 }
-- 
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