xcoff: implement linker relaxation

bfd/ChangeLog:

	* coff-rs6000.c (xcoff_reloc_type_noop): Add info argument.
	(xcoff_reloc_type_fail): Likewise.
	(xcoff_reloc_type_pos): Likewise.
	(xcoff_reloc_type_neg): Likewise.
	(xcoff_reloc_type_rel): Likewise.
	(xcoff_reloc_type_toc): Likewise.
	(xcoff_reloc_type_ba): Likewise.
	(xcoff_reloc_type_crel): Likewise.
	(xcoff_reloc_type_tls): Likewise.
	(xcoff_reloc_type_br): Add stub handler.
	(xcoff_ppc_relocate_section): Add info to
	xcoff_calculate_relocation.
	(xcoff_stub_indirect_call_code): New constant.
	(xcoff_stub_shared_call_code): Likewise.
	(bfd_xcoff_backend_data): Add stub code fields.
	(bfd_pmac_xcoff_backend_data): Likewise.
	* coff64-rs6000.c (xcoff64_reloc_type_br): Add stub handler.
	(xcoff64_ppc_relocate_section): Add info to
	xcoff64_calculate_relocation.
	(xcoff64_stub_indirect_call_code): New constant.
	(xcoff64_stub_shared_call_code): Likewise.
	(bfd_xcoff_backend_data): Add stub code fields.
	(bfd_xcoff_aix5_backend_data): Likewise.
	* libxcoff.h (struct xcoff_backend_data_rec): Add stub fields.
	(bfd_xcoff_stub_indirect_call_code): New define.
	(bfd_xcoff_stub_indirect_call_size): New define.
	(bfd_xcoff_stub_shared_call_code): New define.
	(bfd_xcoff_stub_shared_call_size): New define.
	(xcoff_reloc_function): Add info argument.
	(enum xcoff_stub_type): New enum.
	(struct xcoff_stub_hash_entry): New structure.
	* xcofflink.c (struct xcoff_link_hash_table): Add stub hash
	table and params fields.
	(xcoff_stub_hash_entry): New define.
	(xcoff_stub_hash_lookup): New define.
	(stub_hash_newfunc): New function.
	(_bfd_xcoff_bfd_link_hash_table_free): Free the new stub hash
	table.
	(_bfd_xcoff_bfd_link_hash_table_create): Create the new stub
	hash table.
	(xcoff_link_add_symbols): Save rawsize for XTY_SD.
	(bfd_xcoff_link_init): New function.
	(xcoff_stub_csect_name): New function.
	(xcoff_stub_get_csect_in_range): New function.
	(xcoff_stub_name): New function.
	(bfd_xcoff_get_stub_entry): New function.
	(bfd_xcoff_type_of_stub): New function.
	(xcoff_add_stub): New function.
	(xcoff_build_one_stub): New function.
	(bfd_xcoff_size_stubs): New function.
	(bfd_xcoff_build_stubs): New function.
	(xcoff_stub_create_relocations): New function.
	(xcoff_link_input_bfd): Adapt relocations to stub.
	(xcoff_write_global_symbol): Adapt to new TOC entries generated
	for stubs.
	(_bfd_xcoff_bfd_final_link): Handle stub file.
	* xcofflink.h (struct bfd_xcoff_link_params): New structure.

ld/ChangeLog:

	* emultempl/aix.em (params): New variable.
	(stub_file): New variable.
	(xcoff_add_stub_section): New function.
	(xcoff_layout_sections_again): New function
	(hook_in_stub): New function.
	(_after_allocation): Add stub creation.
	(_create_output_section_statements): Allocate stub file and
	pass params to backend.

1 files changed, 58 insertions, 5 deletions

diff --git a/bfd/libxcoff.h b/bfd/libxcoff.h
index 2a71ee5..c6ad6dc 100644
--- a/bfd/libxcoff.h
+++ b/bfd/libxcoff.h
@@ -99,6 +99,15 @@ struct xcoff_backend_data_rec
   unsigned int _xcoff_rtinit_size;
   bool (*_xcoff_generate_rtinit)
     (bfd *, const char *, const char *, bool);
+
+  /* Stubs code generation.
+     The code part is an array which might need to be modified by
+     some relocations.
+     The size is in bytes.  */
+  const unsigned long *_xcoff_stub_indirect_call_code;
+  unsigned long _xcoff_stub_indirect_call_size;
+  const unsigned long *_xcoff_stub_shared_call_code;
+  unsigned long _xcoff_stub_shared_call_size;
 };
 
 /* Look up an entry in an XCOFF link hash table.  */
@@ -185,6 +194,11 @@ struct xcoff_backend_data_rec
 #define bfd_xcoff_glink_code(a, b)   ((xcoff_backend (a)->_xcoff_glink_code[(b)]))
 #define bfd_xcoff_glink_code_size(a) ((xcoff_backend (a)->_xcoff_glink_size))
 
+#define bfd_xcoff_stub_indirect_call_code(a, b)   ((xcoff_backend (a)->_xcoff_stub_indirect_call_code[(b)]))
+#define bfd_xcoff_stub_indirect_call_size(a) ((xcoff_backend (a)->_xcoff_stub_indirect_call_size))
+#define bfd_xcoff_stub_shared_call_code(a, b)   ((xcoff_backend (a)->_xcoff_stub_shared_call_code[(b)]))
+#define bfd_xcoff_stub_shared_call_size(a) ((xcoff_backend (a)->_xcoff_stub_shared_call_size))
+
 /* Check for the magic number U803XTOCMAGIC or U64_TOCMAGIC for 64 bit
    targets.  */
 #define bfd_xcoff_is_xcoff64(a) \
@@ -211,11 +225,12 @@ struct xcoff_backend_data_rec
 #define N_ONES(n) (((((bfd_vma) 1 << ((n) - 1)) - 1) << 1) | 1)
 
 typedef bool xcoff_reloc_function (bfd *, asection *, bfd *,
-					  struct internal_reloc *,
-					  struct internal_syment *,
-					  struct reloc_howto_struct *,
-					  bfd_vma, bfd_vma,
-					  bfd_vma *, bfd_byte *);
+				   struct internal_reloc *,
+				   struct internal_syment *,
+				   struct reloc_howto_struct *,
+				   bfd_vma, bfd_vma,
+				   bfd_vma *, bfd_byte *,
+				   struct bfd_link_info *);
 
 typedef bool xcoff_complain_function (bfd *, bfd_vma, bfd_vma,
 					     struct reloc_howto_struct *);
@@ -261,4 +276,42 @@ struct xcoff_dwsect_name {
 extern const struct xcoff_dwsect_name
   xcoff_dwsect_names[XCOFF_DWSECT_NBR_NAMES];
 
+/* Structure and functions needed by backend in order to handle
+   stubs created in xcofflink.c.  */
+
+enum xcoff_stub_type
+  {
+    xcoff_stub_none,
+    xcoff_stub_indirect_call,
+    xcoff_stub_shared_call
+  };
+
+struct xcoff_stub_hash_entry
+{
+  /* Base hash table entry structure.  */
+  struct bfd_hash_entry root;
+
+  enum xcoff_stub_type stub_type;
+
+  /* The hash table entry of the stub's csect.  */
+  struct xcoff_link_hash_entry *hcsect;
+
+  /* Offset in the stub's csect.  */
+  bfd_vma stub_offset;
+
+  /* The target's section.  */
+  asection *target_section;
+
+  /* The target's hash table entry.  */
+  struct xcoff_link_hash_entry *htarget;
+};
+
+
+extern enum xcoff_stub_type bfd_xcoff_type_of_stub
+  (asection *, const struct internal_reloc *, bfd_vma,
+   struct xcoff_link_hash_entry *);
+
+extern struct xcoff_stub_hash_entry *bfd_xcoff_get_stub_entry
+  (asection *, struct xcoff_link_hash_entry *, struct bfd_link_info *);
+
 #endif /* LIBXCOFF_H */