libdl: Add powerpc large memory and small data support.

- Add support for architecure sections that can be handled by the
  architecture back end.

- Add trampoline/fixup support for PowerPC. This means the PowerPC
  now supports large memory loading of applications.

- Add a bit allocator to manage small block based regions of memory.

- Add small data (sdata/sbss) support for the PowerPC. The support
  makes the linker allocated small data region of memory a global
  resource available to libdl loaded object files.

Updates #3687
Updates #3685

4 files changed, 25 insertions, 2 deletions

diff --git a/bsps/powerpc/psim/start/linkcmds b/bsps/powerpc/psim/start/linkcmds
index d5e61f9425..a34f4a2bcd 100644
--- a/bsps/powerpc/psim/start/linkcmds
+++ b/bsps/powerpc/psim/start/linkcmds
@@ -38,8 +38,8 @@ PROVIDE (PSIM_INSTRUCTIONS_PER_MICROSECOND = 10000);
 PSIM = 0x0c000000;
 
 /*
- * Allocate the maximum memory to the sdata/sbss section.
+ * Allocate the maximum size to the small data sdata/sbss section.
  */
-bsp_section_sdata_bss_maximum_size = 1;
+bsp_section_set_sdata_sbss_size = 65536;
 
 INCLUDE linkcmds.base
diff --git a/bsps/powerpc/qoriq/start/linkcmds.qoriq_e500 b/bsps/powerpc/qoriq/start/linkcmds.qoriq_e500
index 5328e73c5b..266e21b934 100644
--- a/bsps/powerpc/qoriq/start/linkcmds.qoriq_e500
+++ b/bsps/powerpc/qoriq/start/linkcmds.qoriq_e500
@@ -35,4 +35,9 @@ bsp_section_robarrier_align = 0x1000000;
 bsp_section_rwbarrier_align = 0x1000000;
 qoriq = 0xffe00000;
 
+/*
+ * Allocate the maximum size to the small data sdata/sbss section.
+ */
+bsp_section_set_sdata_sbss_size = 65536;
+
 INCLUDE linkcmds.base
diff --git a/bsps/powerpc/qoriq/start/linkcmds.qoriq_e6500_32 b/bsps/powerpc/qoriq/start/linkcmds.qoriq_e6500_32
index 4f8bbdfdbc..34a4eee9f4 100644
--- a/bsps/powerpc/qoriq/start/linkcmds.qoriq_e6500_32
+++ b/bsps/powerpc/qoriq/start/linkcmds.qoriq_e6500_32
@@ -38,4 +38,9 @@ qoriq = 0xffe000000;
 qoriq_bman_portal = 0xff4000000;
 qoriq_qman_portal = 0xff6000000;
 
+/*
+ * Allocate the maximum size to the small data sdata/sbss section.
+ */
+bsp_section_set_sdata_sbss_size = 65536;
+
 INCLUDE linkcmds.base
diff --git a/bsps/powerpc/shared/start/linkcmds.base b/bsps/powerpc/shared/start/linkcmds.base
index 4ad302e86b..642f0bf7e1 100644
--- a/bsps/powerpc/shared/start/linkcmds.base
+++ b/bsps/powerpc/shared/start/linkcmds.base
@@ -293,20 +293,33 @@ SECTIONS {
 		KEEP (*(SORT(.rtemsrwset.*)))
 	} > REGION_DATA AT > REGION_DATA_LOAD
 	.sdata : ALIGN_WITH_INPUT {
+		bsp_section_sdata_begin = .;
 		PROVIDE (_SDA_BASE_ = 32768);
 		*(.sdata .sdata.* .gnu.linkonce.s.*)
+		bsp_section_sdata_end = .;
 		bsp_section_data_end = .;
 	} > REGION_DATA AT > REGION_DATA_LOAD
+	bsp_section_sdata_size = bsp_section_sdata_end - bsp_section_sdata_begin;
 	bsp_section_data_size = bsp_section_data_end - bsp_section_data_begin;
 	bsp_section_data_load_begin = LOADADDR (.data);
 	bsp_section_data_load_end = bsp_section_data_load_begin + bsp_section_data_size;
 
+	/*
+	 * Set bsp_section_set_sdata_bss_size to the system's sdata and bss data size, eg:
+	 *
+	 *  bsp_section_set_sdata_sbss_size = 65536;
+	 */
+	bsp_section_sdata_sbss_size = DEFINED(bsp_section_set_sdata_sbss_size) ?
+							bsp_section_set_sdata_sbss_size : 0;
 	.sbss : ALIGN_WITH_INPUT {
 		bsp_section_sbss_begin = .;
 		*(.dynsbss)
 		*(.sbss .sbss.* .gnu.linkonce.sb.*)
 		*(.scommon)
 		bsp_section_sbss_end = .;
+		bsp_section_sdata_libdl_begin = .;
+		. += bsp_section_sdata_sbss_size - (bsp_section_sdata_size + bsp_section_sbss_size);
+		bsp_section_sdata_libdl_end = .;
 	} > REGION_DATA AT > REGION_DATA
 	bsp_section_sbss_size = bsp_section_sbss_end - bsp_section_sbss_begin;