From 7129c310626a276f171da52fb0cbddd5c16b5a9b Mon Sep 17 00:00:00 2001
From: Bernd Schmidt <bernds_cb1@t-online.de>
Date: Tue, 4 Dec 2007 02:14:39 +0000
Subject: Blackfin FD-PIC patch 6/6. These are mostly the changes necessary to
 deal with loading the libraries into memory.  A couple new target macros are
 defined for this purpose, and the code in dl-elf.c is modified to deal with
 nommu systems.

---
 ldso/include/dl-defs.h | 51 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

(limited to 'ldso/include/dl-defs.h')

diff --git a/ldso/include/dl-defs.h b/ldso/include/dl-defs.h
index 3de7f5230..2c4402929 100644
--- a/ldso/include/dl-defs.h
+++ b/ldso/include/dl-defs.h
@@ -110,7 +110,7 @@ typedef struct {
 #endif
 
 /* Initialize a LOADADDR representing the loader itself.  It's only
- * called from DL_BOOT, so additional arguments passed to it may be
+ * called from DL_START, so additional arguments passed to it may be
  * referenced.
  */
 #ifndef DL_INIT_LOADADDR_BOOT
@@ -144,6 +144,12 @@ typedef struct {
 	((LOADADDR) = (DL_LOADADDR_TYPE)(BASEADDR))
 #endif
 
+/* Update LOADADDR with information about PHDR, just mapped to the
+   given ADDR.  */
+#ifndef DL_INIT_LOADADDR_HDR
+# define DL_INIT_LOADADDR_HDR(LOADADDR, ADDR, PHDR) /* Do nothing.  */
+#endif
+
 /* Convert a DL_LOADADDR_TYPE to an identifying pointer.  Used mostly
  * for debugging.
  */
@@ -166,6 +172,13 @@ typedef struct {
 	 && (!(TFROM) || (TFROM)->loadaddr < (TPNT)->loadaddr))
 #endif
 
+/* This is called from dladdr() to give targets that use function descriptors
+ * a chance to map a function descriptor's address to the function's entry
+ * point before trying to find in which library it's defined.  */
+#ifndef DL_LOOKUP_ADDRESS
+#define DL_LOOKUP_ADDRESS(ADDRESS) (ADDRESS)
+#endif
+
 /* Use this macro to convert a pointer to a function's entry point to
  * a pointer to function.  The pointer is assumed to have already been
  * relocated.  LOADADDR is passed because it may contain additional
@@ -202,4 +215,40 @@ typedef struct {
 # define DL_FIND_HASH_VALUE(TPNT, TYPE, SYM) (DL_RELOC_ADDR ((SYM)->st_value, (TPNT)->loadaddr))
 #endif
 
+/* Unmap all previously-mapped segments accumulated in LOADADDR.
+   Generally used when an error occurs during loading.  */
+#ifndef DL_LOADADDR_UNMAP
+# define DL_LOADADDR_UNMAP(LOADADDR, LEN) \
+  _dl_munmap((char *) (LOADADDR), (LEN))
+#endif
+
+/* Similar to DL_LOADADDR_UNMAP, but used for libraries that have been
+   dlopen()ed successfully, when they're dlclose()d.  */
+#ifndef DL_LIB_UNMAP
+# define DL_LIB_UNMAP(LIB, LEN) (DL_LOADADDR_UNMAP ((LIB)->loadaddr, (LEN)))
+#endif
+
+/* Define this to verify that a library named LIBNAME, whose ELF
+   headers are pointed to by EPNT, is suitable for dynamic linking.
+   If it is not, print an error message (optional) and return NULL.
+   If the library can have its segments relocated independently,
+   arrange for PICLIB to be set to 2.  If all segments have to be
+   relocated by the same amount, set it to 1.  If it has to be loaded
+   at physical addresses as specified in the program headers, set it
+   to 0.  A reasonable (?) guess for PICLIB will already be in place,
+   so it is safe to do nothing here.  */
+#ifndef DL_CHECK_LIB_TYPE
+# define DL_CHECK_LIB_TYPE(EPNT, PICLIB, PROGNAME, LIBNAME) (void)0
+#endif
+
+/* Define this if you have special segment.  */
+#ifndef DL_IS_SPECIAL_SEGMENT
+# define DL_IS_SPECIAL_SEGMENT(EPNT, PPNT) 0
+#endif
+
+/* Define this if you want to use special method to map the segment.  */
+#ifndef DL_MAP_SEGMENT
+# define DL_MAP_SEGMENT(EPNT, PPNT, INFILE, FLAGS) 0
+#endif
+
 #endif	/* _LD_DEFS_H */
-- 
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