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

Updates #3687

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.*)

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__ = .);
 

bsps/powerpc/mpc8260ads/start/linkcmds

@@ -229,18 +229,26 @@ SECTIONS
     PROVIDE (__FIXUP_END__ = .);
 
     .sdata : {
+      bsp_section_sdata_begin = .;
       PROVIDE (_SDA_BASE_ = 32768);
       *(.sdata .sdata.* .gnu.linkonce.s.*)
+      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 : {

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       :

bsps/powerpc/ss555/start/linkcmds

@@ -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 = .;
   }
@@ -216,10 +218,16 @@ 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 :
   {

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

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

cpukit/libdl/rtl-mdreloc-powerpc.c

@@ -50,11 +50,16 @@ get_sda_base (void)
 static void*
 get_sdata_start (void)
 {
+#if _ARCH_PPC64
+  return NULL;
+#else
   Elf_Addr addr;
   GET_ADDR(__SDATA_START__, addr);
   return (void*) addr;
+#endif
 }
 
+#if !_ARCH_PPC64
 static size_t
 get_sdata_sbss_size (void)
 {
@@ -74,6 +79,7 @@ get_sdata_libdl_size (void)
   GET_ADDR(bsp_section_sdata_libdl_end, end);
   return end - begin;
 }
+#endif
 
 uint32_t
 rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
@@ -89,6 +95,7 @@ rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
                                   const Elf_Shdr*      shdr,
                                   const uint32_t       flags)
 {
+#if !_ARCH_PPC64
   struct {
     const char* label;
     size_t      len;
@@ -104,6 +111,7 @@ rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
     if (strncmp (name, prefix[p].label, prefix[p].len) == 0)
       return flags | RTEMS_RTL_OBJ_SECT_ARCH_ALLOC;
   }
+#endif
   return flags;
 }
 
@@ -111,6 +119,10 @@ bool
 rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
                                   rtems_rtl_obj_sect*  sect)
 {
+#if _ARCH_PPC64
+    rtems_rtl_set_error (ENOMEM, ".sdata no supported by ABI");
+    return false;
+#else
   if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL))
     printf ("rtl: section: arch: alloc: name=%s size=%zu flags=%08" PRIx32 \
             " order=%i link=%d info=%d\n",
@@ -138,16 +150,19 @@ rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
   }
 
   return true;
+#endif
 }
 
 bool
 rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
                                   rtems_rtl_obj_sect*  sect)
 {
+#if !_ARCH_PPC64
   if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL))
     printf ("rtl: section: arch: free: name=%s size=%zu\n", sect->name, sect->size);
   if (sdata != NULL)
     rtems_rtl_bit_alloc_bfree (sdata, sect->base, sect->size);
+#endif
   return true;
 }