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

1 files changed, 40 insertions, 1 deletions

diff --git a/cpukit/libdl/rtl-elf.h b/cpukit/libdl/rtl-elf.h
index d781bfb3a4..73d1e01bb1 100644
--- a/cpukit/libdl/rtl-elf.h
+++ b/cpukit/libdl/rtl-elf.h
@@ -70,7 +70,7 @@ typedef struct rtems_rtl_mdreloc_trmap
 
 /**
  * Architecture specific handler to translate unknown section flags to RTL
- * section flags.
+ * section flags. If this function returns 0 an error is raised.
  *
  * @param obj The object file being relocated.
  * @param shdr The ELF section header.
@@ -81,6 +81,45 @@ uint32_t rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
                                       const Elf_Shdr*      shdr);
 
 /**
+ * Architecture specific handler to parse the section and add any flags that
+ * may be need to handle the section.
+ *
+ * @param obj The object file being relocated.
+ * @param seciton The section index.
+ * @param name The name of the section
+ * @param shdr The ELF section header.
+ * @param flags The standard ELF parsed flags.
+ * @retval uint32_t Extra RTL object file flags.
+ */
+uint32_t rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
+                                           int                  section,
+                                           const char*          name,
+                                           const Elf_Shdr*      shdr,
+                                           const uint32_t       flags);
+
+/**
+ * Architecture specific handler to allocate a section. Some sections are
+ * specific to an architecture and need special allocators.
+ *
+ * @param obj The object file being relocated.
+ * @param sect The section data.
+ * @retval true The allocator was successful.
+ */
+bool rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
+                                       rtems_rtl_obj_sect* sect);
+
+/**
+ * Architecture specific handler to free a section. Some sections are
+ * specific to an architecture and need special allocators.
+ *
+ * @param obj The object file being relocated.
+ * @param sect The section data.
+ * @retval true The allocator was successful.
+ */
+bool rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
+                                      rtems_rtl_obj_sect* sect);
+
+/**
  * Architecture specific handler to check is a relocation record's type is
  * required to resolve a symbol.
  *