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.

1 files changed, 104 insertions, 174 deletions

diff --git a/c/src/lib/libbsp/m68k/mvme167/startup/linkcmds b/c/src/lib/libbsp/m68k/mvme167/startup/linkcmds
index 739552c670..8ddee103c5 100644
--- a/c/src/lib/libbsp/m68k/mvme167/startup/linkcmds
+++ b/c/src/lib/libbsp/m68k/mvme167/startup/linkcmds
@@ -29,9 +29,6 @@ RAM_END = RAM_START + RAM_SIZE;
 
 /*
  * Declare some sizes.
- * XXX: The assignment of ". += XyzSize;" fails in older gld's if the
- *      number used there is not constant.  If this happens to you, edit
- *      the lines marked XXX below to use a constant value.
  */
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
 StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
@@ -49,175 +46,108 @@ MEMORY
 
 SECTIONS
 {
-  /* 
-   * We want the entry point to be the first thing in memory.
-   * Merge all read-only data into the .text section.
-   */
-  .text 0x00800000 :
-  {
-    text_start = . ;
-    
-    *(.text)
-    *(.text.*)
-    *(.stub)
-
-    /* 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(.init)
-    
-    . = ALIGN (16);
-    
-    /* C++ constructors and destructors for static objects.
-     *
-     * 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.
-     */
-    PROVIDE (__CTOR_LIST__ = .);
-    *crtbegin.o(.ctors)
-    *(.ctors)
-    *crtend.o(.ctors)
-    PROVIDE (__CTOR_END__ = .);
-
-    PROVIDE (__DTOR_LIST__ = .);
-    *crtbegin.o(.dtors)
-    *(.dtors)
-    *crtend.o(.dtors)
-    PROVIDE (__DTOR_END__ = .);
-    
-    . = ALIGN (16);
-    
-    /* Exception frame info */
-    *(.eh_frame)
-    
-    . = ALIGN (16);
-
-    /* Do we have any of these with egcs-1.x and higher? */
-    *(.gcc_exc)
-    
-    . = ALIGN (16);
-		
-    _rodata_start = . ;
-    *(.rodata)
-    *(.rodata.*)
-    *(.gnu.linkonce.r*)
-    *(.rodata1)    
-    _erodata = .;
-
-    _etext = .;
-    PROVIDE (etext = .);
-       
-  } >ram =0x4e75
- 
-  . = ALIGN (16);
-  
-  .data :
-  {
-    data_start = .;
-    
-    *(.data)
-    *(.data.*)
-    *(.data1)
-    *(.sdata)
-    *(.gnu.linkonce.d*)
-    *(.gcc_except_table)
-    
-    . = ALIGN (16); 
-    _edata = .;
-    PROVIDE (edata = .); 
-  } >ram
-
-  .bss :
-  {
-    bss_start = .;
-    *(.dynbss)
-    *(.bss)
-    *(COMMON)
-    *(.sbss)
-    *(.scommon)  
-    
-    . = ALIGN (16);
-    _end = .;
-    PROVIDE (end = .); 
-  } >ram
-
-  _HeapStart	= .;
-  . += HeapSize;	/* XXX -- Old gld can't	handle this	*/
-  _HeapEnd = .;
-  _StackStart = .;
-  . += StackSize;	/* XXX -- Old gld can't	handle this	*/
-  /* . +=	0x10000; */	/* HeapSize	for	old	gld	*/
-  /* . +=	0x1000;	 */	/* StackSize for old gld */
-  . =	ALIGN (16);
-  _StackEnd = .;
-  stack_init = .;
-  clear_end =	.;
-
-  _WorkspaceBase	= .;
-
-  /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
-  
-  /* DWARF debug sections.
-     Symbols in the DWARF debugging sections are relative to the beginning
-     of the section so we begin them at 0.  */
-  /* DWARF 1 */
-  .debug          0 : { *(.debug) }
-  .line           0 : { *(.line) }
-  
-  /* GNU DWARF 1 extensions */
-  .debug_srcinfo  0 : { *(.debug_srcinfo) }
-  .debug_sfnames  0 : { *(.debug_sfnames) }
-  
-  /* DWARF 1.1 and DWARF 2 */
-  .debug_aranges  0 : { *(.debug_aranges) }
-  .debug_pubnames 0 : { *(.debug_pubnames) }
-  
-  /* DWARF 2 */
-  .debug_info     0 : { *(.debug_info) }
-  .debug_abbrev   0 : { *(.debug_abbrev) }
-  .debug_line     0 : { *(.debug_line) }
-  .debug_frame    0 : { *(.debug_frame) }
-  .debug_str      0 : { *(.debug_str) }
-  .debug_loc      0 : { *(.debug_loc) }
-  .debug_macinfo  0 : { *(.debug_macinfo) }
-  
-  /* SGI/MIPS DWARF 2 extensions */
-  .debug_weaknames 0 : { *(.debug_weaknames) }
-  .debug_funcnames 0 : { *(.debug_funcnames) }
-  .debug_typenames 0 : { *(.debug_typenames) }
-  .debug_varnames  0 : { *(.debug_varnames) }
-  /* These must appear regardless of  .  */
-}
+	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 = .);
+                PROVIDE (_clear_end = .);
+
+                PROVIDE (_WorkspaceBase = .);
+        } >ram
+}