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, 82 insertions, 0 deletions

diff --git a/cpukit/libdl/rtl-bit-alloc.h b/cpukit/libdl/rtl-bit-alloc.h
new file mode 100644
index 0000000000..d977473a96
--- /dev/null
+++ b/cpukit/libdl/rtl-bit-alloc.h
@@ -0,0 +1,82 @@
+/*
+ *  COPYRIGHT (c) 2019 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+/**
+ * @file
+ *
+ * @ingroup rtems_rtl
+ *
+ * @brief RTEMS Run-Time Linker Bit Allocator Header
+ */
+
+#if !defined (_RTEMS_RTL_BIT_ALLOC_H_)
+#define _RTEMS_RTL_BIT_ALLOC_H_
+
+#include <rtems/rtl/rtl-fwd.h>
+#include <rtems/rtl/rtl-obj-fwd.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * Bit Allocator data
+ */
+typedef struct rtems_rtl_bit_alloc
+{
+  uint8_t*  base;       /**< The memory being allocated. */
+  size_t    size;       /**< The number of bytes of memory being managed. */
+  uint32_t* bits;       /**< The bit map indicating which blocks are allocated. */
+  size_t    block_size; /**< The size of a block, the minimum allocation unit. */
+  size_t    blocks;     /**< The number of blocks in the memory. */
+} rtems_rtl_bit_alloc;
+
+/**
+ * Open a bit allocator. The allocator allocates block_size pieces of the memory
+ * being managed.
+ *
+ * @param base The memory to managem NULL to allocate a piece of memory.
+ * @param size The size of the memory being managed in bytes.
+ * @param block_size The minimum allocation unit in bytes.
+ * @param used The amount of memory already in use in bytes.
+ * @retval rtems_rtl_bit_alloc The bit allocator structure.
+ */
+rtems_rtl_bit_alloc* rtems_rtl_bit_alloc_open (void*  base,
+                                               size_t size,
+                                               size_t block_size,
+                                               size_t used);
+
+/**
+ * Close the bit allocator.
+ *
+ * @param balloc The allocator to close.
+ */
+
+void rtems_rtl_bit_alloc_close (rtems_rtl_bit_alloc* balloc);
+
+/**
+ * Allocate a piece of memory being managed. The size is in bytes are is rounded
+ * up the next block size.
+ *
+ * @param balloc The allocator.
+ * @param size Number of bytes to allocate.
+ * @return void* The memory if the allocation is successful else NULL if there
+ *               is no more memory.
+ */
+void* rtems_rtl_bit_alloc_balloc (rtems_rtl_bit_alloc* balloc, size_t size);
+
+/**
+ * Free an allocated memory block. The size is required because the allocator does not
+ * contain any state information.
+ */
+void rtems_rtl_bit_alloc_bfree (rtems_rtl_bit_alloc* balloc, void* addr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif