libdl: Add small data support to the remaining PowerPC BSPs.

Updates #3687

7 files changed, 129 insertions, 42 deletions

diff --git a/bsps/powerpc/gen5200/start/linkcmds.gen5200_base b/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
index 5ab30882ce..ca9d50ebb5 100644
--- a/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
+++ b/bsps/powerpc/gen5200/start/linkcmds.gen5200_base
@@ -27,6 +27,15 @@ RamBase = bsp_ram_start;
 RamSize = bsp_ram_size;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
 
+/*
+ * The upper layer linker command file may optionally define the symbol
+ * bsp_section_small_data_area_size.  By default, the small data area is
+ * defined by the .sdata and .sbss input sections.  Define
+ * bsp_section_small_data_area_size, if you want to make space available for
+ * dynamically loaded libraries (libdl).  Small memory targets which do not use
+ * libdl, should not define this symbol.
+ */
+
 MEMORY {
 	UNEXPECTED_SECTIONS : ORIGIN = 0xffffffff, LENGTH = 0
 }
@@ -233,6 +242,7 @@ SECTIONS {
 	} > RAM
 
 	.sdata : {
+		bsp_section_sdata_begin = .;
 		PROVIDE (_SDA_BASE_ = 32768);
 		*(.sdata .sdata.* .gnu.linkonce.s.*)
 
@@ -245,13 +255,14 @@ SECTIONS {
 		 * BSP: End of data section
 		 */
 		bsp_section_data_end = .;
+		bsp_section_sdata_end = .;
 	} > RAM
 
 	.sbss : {
 		/*
 		 * BSP: Start of bss section
 		 */
-		bsp_section_bss_start = .;
+		bsp_section_sbss_begin = .;
 
 		__bss_start = .;
 
@@ -260,11 +271,17 @@ SECTIONS {
 		*(.dynsbss)
 		*(.sbss .sbss.* .gnu.linkonce.sb.*)
 		PROVIDE (__sbss_end = .); PROVIDE (___sbss_end = .);
+		bsp_section_sbss_end = .;
+		bsp_section_sdata_libdl_begin = .;
+		. = DEFINED(bsp_section_small_data_area_size) ?
+		      bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+		bsp_section_sdata_libdl_end = .;
 
 		. = ALIGN (bsp_section_align);
 	} > RAM
 
 	.bss : {
+		bsp_section_bss_start = .;
 		*(COMMON)
 		*(.dynbss)
 		*(.bss .bss.* .gnu.linkonce.b.*)
diff --git a/bsps/powerpc/haleakala/start/linkcmds b/bsps/powerpc/haleakala/start/linkcmds
index 7cd993c0c9..dad3e5cc76 100644
--- a/bsps/powerpc/haleakala/start/linkcmds
+++ b/bsps/powerpc/haleakala/start/linkcmds
@@ -24,6 +24,10 @@ MEMORY {
         /*FLASH : ORIGIN = 0xFFE00000, LENGTH = 16M*/
 }
 
+/*
+ * Max sdata/bss.
+ */
+bsp_section_small_data_area_size = 65536;
 
 SECTIONS
 {
@@ -217,19 +221,27 @@ SECTIONS
 	.sdata : {
       . = ALIGN (4);
 	  PROVIDE (__SDATA_START__ = .);
+      bsp_section_sdata_begin = .;
       sdata.start = .;
 	  *(.sdata*)
       *(.gnu.linkonce.s.*)
 	  sdata.end = .;
+      bsp_section_sdata_end = .;
 	} > RAM
 
 	/* Zeroed small data addressed as offsets from r13 */
    .sbss : {
       . = ALIGN (4);
 	  PROVIDE(__SBSS_START__ = .);
+      bsp_section_sbss_begin = .;
 	  sbss.start = .;
       *(.sbss .sbss.* *.gnu.linkonce.sb.*);
 	  sbss.end = .;
+      bsp_section_sbss_end = .;
+      bsp_section_sdata_libdl_begin = .;
+      . = DEFINED(bsp_section_small_data_area_size) ?
+            bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+      bsp_section_sdata_libdl_end = .;
     } > RAM
     PROVIDE(__SBSS_END__ = .);
 
diff --git a/bsps/powerpc/mpc8260ads/start/linkcmds b/bsps/powerpc/mpc8260ads/start/linkcmds
index 84933b48e9..82550d41a8 100644
--- a/bsps/powerpc/mpc8260ads/start/linkcmds
+++ b/bsps/powerpc/mpc8260ads/start/linkcmds
@@ -100,7 +100,7 @@ SECTIONS
      *  end terminate with a NULL entry.
      */
 
-    PROVIDE (__CTOR_LIST__ = .);	
+    PROVIDE (__CTOR_LIST__ = .);
     /* LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) */
     *crtbegin.o(.ctors)
     *(.ctors)
@@ -227,28 +227,36 @@ SECTIONS
     .fixup	  : { *(.fixup) 	} >ram
     PROVIDE (_FIXUP_END_ = .);
     PROVIDE (__FIXUP_END__ = .);
-  
+
     .sdata : {
+      bsp_section_sdata_begin = .;
       PROVIDE (_SDA_BASE_ = 32768);
       *(.sdata .sdata.* .gnu.linkonce.s.*)
-    } > ram
- 
+      bsp_section_sdata_end = .;
+  } > ram
+
     .sbss : {
       __bss_start = .;
- 
+      bsp_section_sbss_begin = .;
+
       PROVIDE (__sbss_start = .); PROVIDE (___sbss_start = .);
       *(.scommon)
       *(.dynsbss)
       *(.sbss .sbss.* .gnu.linkonce.sb.*)
       PROVIDE (__sbss_end = .); PROVIDE (___sbss_end = .);
+      bsp_section_sbss_end = .;
+      bsp_section_sdata_libdl_begin = .;
+      . = DEFINED(bsp_section_small_data_area_size) ?
+	      bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+      bsp_section_sdata_libdl_end = .;
     } > ram
- 
+
     .sdata2 : {
       PROVIDE (_SDA2_BASE_ = 32768);
- 
+
       *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
     } > ram =0
- 
+
     .sbss2 : {
       *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
     } > ram =0
diff --git a/bsps/powerpc/shared/start/linkcmds.share b/bsps/powerpc/shared/start/linkcmds.share
index 25655236a7..7bf7279a02 100644
--- a/bsps/powerpc/shared/start/linkcmds.share
+++ b/bsps/powerpc/shared/start/linkcmds.share
@@ -1,12 +1,23 @@
 OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
               "elf32-powerpc")
 OUTPUT_ARCH(powerpc)
+
 /* Do we need any of these for elf?
    __DYNAMIC = 0;    */
 MEMORY {
 	VECTORS	: ORIGIN = 0x0 ,  LENGTH = 0x3000
 	CODE : ORIGIN = 0x3000 , LENGTH = 32M - 0x3000
 }
+
+/*
+ * The upper layer linker command file may optionally define the symbol
+ * bsp_section_small_data_area_size.  By default, the small data area is
+ * defined by the .sdata and .sbss input sections.  Define
+ * bsp_section_small_data_area_size, if you want to make space available for
+ * dynamically loaded libraries (libdl).  Small memory targets which do not use
+ * libdl, should not define this symbol.
+ */
+
 SECTIONS
 {
   .entry_point_section :
@@ -215,11 +226,17 @@ SECTIONS
   /* We want the small data sections together, so single-instruction offsets
      can access them all, and initialized data all before uninitialized, so
      we can shorten the on-disk segment size.  */
-  .sdata	  : { PROVIDE (_SDA_BASE_ = 32768); *(.sdata*) *(.gnu.linkonce.s.*)	} >CODE
+  .sdata : {
+    bsp_section_sdata_begin = .;
+    PROVIDE (_SDA_BASE_ = 32768);
+    *(.sdata*) *(.gnu.linkonce.s.*)
+    bsp_section_sdata_end = .;
+  } > CODE
   _edata  =  .;
   PROVIDE (edata = .);
   .sbss      :
   {
+    bsp_section_sbss_begin = .;
     PROVIDE (__sbss_start = .);
     *(.dynsbss)
     *(.sbss* .gnu.linkonce.sb.*)
@@ -230,6 +247,11 @@ SECTIONS
     . += 1;
     PROVIDE (__SBSS_END__ = .);
     PROVIDE (__sbss_end = .);
+    bsp_section_sbss_end = .;
+    bsp_section_sdata_libdl_begin = .;
+     . = DEFINED(bsp_section_small_data_area_size) ?
+         bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+    bsp_section_sdata_libdl_end = .;
   } > CODE
   .plt   : { *(.plt) }	> CODE
   .bss       :
diff --git a/bsps/powerpc/ss555/start/linkcmds b/bsps/powerpc/ss555/start/linkcmds
index e8df31e2f0..04c9556397 100644
--- a/bsps/powerpc/ss555/start/linkcmds
+++ b/bsps/powerpc/ss555/start/linkcmds
@@ -15,7 +15,7 @@
  */
 
 OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
-OUTPUT_ARCH(powerpc) 
+OUTPUT_ARCH(powerpc)
 STARTUP(start.o)
 ENTRY(start)
 EXTERN(_vectors)
@@ -35,14 +35,14 @@ SECTIONS
     /*
      * For the MPC555, we use the compressed vector table format which puts
      * all of the exception vectors before 0x100.
-     */ 
+     */
     *(.vectors)
   }
 
   .text 0x100:
   {
     /* Read-only sections, merged into text segment: */
-    
+
     text.start = .;
 
     /* Entry point is the .entry section */
@@ -54,7 +54,7 @@ SECTIONS
 
     /* C++ constructors/destructors */
     *(.gnu.linkonce.t*)
-	     
+
     /*  Initialization and finalization code.
      *
      *  Various files can provide initialization and finalization functions.
@@ -65,32 +65,32 @@ SECTIONS
      *  doesn't matter if the user does not actually link against ecrti.o and
      *  ecrtn.o; the linker won't look for a file to match a wildcard.  The
      *  wildcard also means that it doesn't matter which directory ecrti.o
-     *  and ecrtn.o are in. 
+     *  and ecrtn.o are in.
      */
     PROVIDE (_init = .);
     *ecrti.o(.init)
     *(.init)
     *ecrtn.o(.init)
-    
+
     PROVIDE (_fini = .);
     *ecrti.o(.fini)
     *(.fini)
     *ecrtn.o(.init)
 
-    /* 
+    /*
      *  C++ constructors and destructors for static objects.
      *  PowerPC EABI does not use crtstuff yet, so we build "old-style"
      *  constructor and destructor lists that begin with the list length
      *  end terminate with a NULL entry.
      */
-    PROVIDE (__CTOR_LIST__ = .);	     
+    PROVIDE (__CTOR_LIST__ = .);
     /* LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2) */
     *crtbegin.o(.ctors)
     *(.ctors)
     *crtend.o(.ctors)
     LONG(0)
     PROVIDE (__CTOR_END__ = .);
-	
+
     PROVIDE (__DTOR_LIST__ = .);
     /* LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2) */
     *crtbegin.o(.dtors)
@@ -98,7 +98,7 @@ SECTIONS
     *crtend.o(.dtors)
     LONG(0)
     PROVIDE (__DTOR_END__ = .);
-	
+
     /*
      * Special FreeBSD sysctl sections.
      */
@@ -139,8 +139,8 @@ SECTIONS
     *(.tdata .tdata.* .gnu.linkonce.td.*)
     _TLS_Data_end = .;
 
-    /* 
-     * .data section contents, copied to RAM at system startup. 
+    /*
+     * .data section contents, copied to RAM at system startup.
      */
     . = ALIGN(0x20);
     data.contents.start = .;
@@ -163,37 +163,37 @@ SECTIONS
    * internal RAM.
    */
   . = DEFINED(RTEMS_DEBUG) ? . : int_ram_org;
- 
+
   .data : AT (data.contents.start)
   {
     data.start = .;
-    
+
     *(.data)
     *(.data.*)
     KEEP (*(SORT(.rtemsrwset.*)))
     *(.data1)
-    
+
     PROVIDE (__SDATA_START__ = .);
     *(.sdata .sdata.* .gnu.linkonce.s.*)
     PROVIDE (__SDATA_END__ = .);
-    
+
     PROVIDE (__EXCEPT_START__ = .);
     *(.gcc_except_table*)
     PROVIDE (__EXCEPT_END__ = .);
-    
+
     PROVIDE(__GOT_START__ = .);
-    *(.got.plt) 
+    *(.got.plt)
     *(.got)
     PROVIDE(__GOT_END__ = .);
-	
+
     *(.got1)
-    
+
     PROVIDE (__GOT2_START__ = .);
     PROVIDE (_GOT2_START_ = .);
     *(.got2)
     PROVIDE (__GOT2_END__ = .);
     PROVIDE (_GOT2_END_ = .);
-	
+
     PROVIDE (__FIXUP_START__ = .);
     PROVIDE (_FIXUP_START_ = .);
     *(.fixup)
@@ -204,9 +204,11 @@ SECTIONS
      *   offsets can access them all.
      */
     PROVIDE (__SDATA2_START__ = .);
+    bsp_section_sdata_begin = .;
     *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
     *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
     PROVIDE (__SDATA2_END__ = .);
+    bsp_section_sdata_end = .;
 
     data.end = .;
   }
@@ -216,14 +218,20 @@ SECTIONS
   .sbss          :
   {
     PROVIDE (__sbss_start = .); PROVIDE (___sbss_start = .);
+    bsp_section_sbss_begin = .;
     *(.dynsbss)
     *(.sbss .sbss.* .gnu.linkonce.sb.*)
     *(.scommon)
     PROVIDE (__sbss_end = .); PROVIDE (___sbss_end = .);
+    bsp_section_sbss_end = .;
+    bsp_section_sdata_libdl_begin = .;
+    . = DEFINED(bsp_section_small_data_area_size) ?
+          bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+    bsp_section_sdata_libdl_end = .;
   }
   .bss :
   {
-    *(.dynbss)	
+    *(.dynbss)
     *(.bss .bss* .gnu.linkonce.b*)
     *(COMMON)
     . = ALIGN(4);
@@ -247,9 +255,9 @@ SECTIONS
   . = DEFINED(RTEMS_DEBUG) ? 0 + ext_ram_size : int_ram_top + ext_ram_size;
   WorkAreaBase = .;
 
- 
-  /* 
-   * Internal I/O devices 
+
+  /*
+   * Internal I/O devices
    */
   .usiu 0x002FC000:		/* unified system interface unit */
   {
@@ -283,22 +291,22 @@ SECTIONS
   .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) }
@@ -307,7 +315,7 @@ SECTIONS
   .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) }
diff --git a/bsps/powerpc/virtex4/start/linkcmds b/bsps/powerpc/virtex4/start/linkcmds
index 46e5111b67..d46df2f53e 100644
--- a/bsps/powerpc/virtex4/start/linkcmds
+++ b/bsps/powerpc/virtex4/start/linkcmds
@@ -209,13 +209,18 @@ SECTIONS
    * we can shorten the on-disk segment size.
    */
   /* Initialised small data addressed as offsets from r13 */
-  .sdata          : { PROVIDE (_SDA_BASE_ = 32768); *(.sdata* .gnu.linkonce.s.*)                     } > RAM
+  .sdata          : {
+	bsp_section_sdata_begin = .;
+  	PROVIDE (_SDA_BASE_ = 32768); *(.sdata* .gnu.linkonce.s.*);
+	bsp_section_sdata_end = .;
+   } > RAM
 
   _edata          = .;
   PROVIDE (edata  = .);
 
   /* Zeroed small data addressed as offsets from r13 */
   .sbss           : { PROVIDE (__sbss_start = .);
+  		      bsp_section_sbss_begin = .;
                       *(.dynsbss)
                       *(.sbss*)
                       *(.gnu.linkonce.sb.*)
@@ -228,6 +233,11 @@ SECTIONS
 
                       PROVIDE (__SBSS_END__ = .);
                       PROVIDE (__sbss_end   = .);
+		      bsp_section_sbss_end = .;
+		      bsp_section_sdata_libdl_begin = .;
+		      . = DEFINED(bsp_section_small_data_area_size) ?
+			bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+		      bsp_section_sdata_libdl_end = .;
                     } > RAM
 
   .plt            : { *(.plt)                                          } > RAM
diff --git a/bsps/powerpc/virtex5/start/linkcmds b/bsps/powerpc/virtex5/start/linkcmds
index 32425f4c7f..9a5edf7643 100644
--- a/bsps/powerpc/virtex5/start/linkcmds
+++ b/bsps/powerpc/virtex5/start/linkcmds
@@ -209,13 +209,18 @@ SECTIONS
    * we can shorten the on-disk segment size.
    */
   /* Initialised small data addressed as offsets from r13 */
-  .sdata          : { PROVIDE (_SDA_BASE_ = 32768); *(.sdata* .gnu.linkonce.s.*)                     } > RAM
+  .sdata          : {
+	bsp_section_sdata_begin = .;
+  	PROVIDE (_SDA_BASE_ = 32768); *(.sdata* .gnu.linkonce.s.*);
+	bsp_section_sdata_end = .;
+   } > RAM
 
   _edata          = .;
   PROVIDE (edata  = .);
 
   /* Zeroed small data addressed as offsets from r13 */
   .sbss           : { PROVIDE (__sbss_start = .);
+  		      bsp_section_sbss_begin = .;
                       *(.dynsbss)
                       *(.sbss*)
                       *(.gnu.linkonce.sb.*)
@@ -228,6 +233,11 @@ SECTIONS
 
                       PROVIDE (__SBSS_END__ = .);
                       PROVIDE (__sbss_end   = .);
+		      bsp_section_sbss_end = .;
+		      bsp_section_sdata_libdl_begin = .;
+		      . = DEFINED(bsp_section_small_data_area_size) ?
+			bsp_section_sdata_begin + bsp_section_small_data_area_size : .;
+		      bsp_section_sdata_libdl_end = .;
                     } > RAM
 
   .plt            : { *(.plt)                                          } > RAM