binutils: add support for non-pic handling and use it in the codesourcery based gcc, fixes mips support for this toolchain

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18070 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 202 insertions, 0 deletions

diff --git a/toolchain/binutils/patches/2.19.1/200-mips_non_pic.patch b/toolchain/binutils/patches/2.19.1/200-mips_non_pic.patch
new file mode 100644
index 000000000..2d3d8def4
--- /dev/null
+++ b/toolchain/binutils/patches/2.19.1/200-mips_non_pic.patch
@@ -0,0 +1,202 @@
+--- a/bfd/elf32-mips.c
++++ b/bfd/elf32-mips.c
+@@ -1662,6 +1662,15 @@ static const struct ecoff_debug_swap mip
+ #define elf_backend_plt_readonly	1
+ #define elf_backend_plt_sym_val		_bfd_mips_elf_plt_sym_val
+ 
++/* Most MIPS ELF files do not contain a traditional PLT; only VxWorks
++   and non-PIC dynamic executables do.  These settings only affect
++   _bfd_elf_create_dynamic_sections, which is only called when we
++   do want a traditional PLT.  */
++#undef elf_backend_want_plt_sym
++#define elf_backend_want_plt_sym		1
++#undef elf_backend_plt_readonly
++#define elf_backend_plt_readonly		1
++
+ #define elf_backend_discard_info	_bfd_mips_elf_discard_info
+ #define elf_backend_ignore_discarded_relocs \
+ 					_bfd_mips_elf_ignore_discarded_relocs
+@@ -1686,6 +1695,8 @@ static const struct ecoff_debug_swap mip
+ #define bfd_elf32_bfd_print_private_bfd_data \
+ 					_bfd_mips_elf_print_private_bfd_data
+ 
++#define elf_backend_plt_sym_val		_bfd_mips_elf_plt_sym_val
++
+ /* Support for SGI-ish mips targets.  */
+ #define TARGET_LITTLE_SYM		bfd_elf32_littlemips_vec
+ #define TARGET_LITTLE_NAME		"elf32-littlemips"
+@@ -1789,6 +1800,7 @@ mips_vxworks_final_write_processing (bfd
+ #undef elf_backend_additional_program_headers
+ #undef elf_backend_modify_segment_map
+ #undef elf_backend_symbol_processing
++#undef elf_backend_plt_sym_val
+ /* NOTE: elf_backend_rela_normal is not defined for MIPS.  */
+ 
+ #include "elf32-target.h"
+--- a/bfd/elfxx-mips.c
++++ b/bfd/elfxx-mips.c
+@@ -677,6 +677,11 @@ static bfd *reldyn_sorting_bfd;
+ /* Nonzero if ABFD is using NewABI conventions.  */
+ #define NEWABI_P(abfd) (ABI_N32_P (abfd) || ABI_64_P (abfd))
+ 
++/* Nonzero if ABFD is a non-PIC object.  */
++#define NON_PIC_P(abfd) \
++  (((elf_elfheader (abfd)->e_flags & EF_MIPS_PIC) == 0) \
++   && ((elf_elfheader (abfd)->e_flags & EF_MIPS_CPIC) == EF_MIPS_CPIC))
++
+ /* The IRIX compatibility level we are striving for.  */
+ #define IRIX_COMPAT(abfd) \
+   (get_elf_backend_data (abfd)->elf_backend_mips_irix_compat (abfd))
+@@ -689,6 +694,9 @@ static bfd *reldyn_sorting_bfd;
+ #define MIPS_ELF_OPTIONS_SECTION_NAME(abfd) \
+   (NEWABI_P (abfd) ? ".MIPS.options" : ".options")
+ 
++/* The name of the section holding non-PIC to PIC call stubs.  */
++#define NON_PIC_TO_PIC_STUB_SECTION_NAME ".MIPS.pic_stubs"
++
+ /* True if NAME is the recognized name of any SHT_MIPS_OPTIONS section.
+    Some IRIX system files do not use MIPS_ELF_OPTIONS_SECTION_NAME.  */
+ #define MIPS_ELF_OPTIONS_SECTION_NAME_P(NAME) \
+@@ -7583,7 +7591,9 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
+ 
+ 	      /* We need a stub, not a plt entry for the undefined
+ 		 function.  But we record it as if it needs plt.  See
+-		 _bfd_elf_adjust_dynamic_symbol.  */
++		 _bfd_elf_adjust_dynamic_symbol.  Note that these relocations
++		 are always used for PIC calls, even when using the new
++		 non-PIC ABI.  */
+ 	      h->needs_plt = 1;
+ 	      h->type = STT_FUNC;
+ 	    }
+@@ -7689,6 +7699,8 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
+ 	case R_MIPS_32:
+ 	case R_MIPS_REL32:
+ 	case R_MIPS_64:
++	  if (h != NULL)
++	    h->non_got_ref = TRUE;
+ 	  /* In VxWorks executables, references to external symbols
+ 	     are handled using copy relocs or PLT stubs, so there's
+ 	     no need to add a .rela.dyn entry for this relocation.  */
+@@ -7744,11 +7756,21 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
+ 	case R_MIPS_GPREL16:
+ 	case R_MIPS_LITERAL:
+ 	case R_MIPS_GPREL32:
++	  if (h != NULL
++	      && (r_type == R_MIPS_GPREL16 || r_type == R_MIPS_GPREL32))
++	    h->non_got_ref = TRUE;
++
+ 	  if (SGI_COMPAT (abfd))
+ 	    mips_elf_hash_table (info)->compact_rel_size +=
+ 	      sizeof (Elf32_External_crinfo);
+ 	  break;
+ 
++	case R_MIPS_HI16:
++	case R_MIPS_LO16:
++	  if (h != NULL && strcmp (h->root.root.string, "_gp_disp") != 0)
++	    h->non_got_ref = TRUE;
++	  break;
++
+ 	  /* This relocation describes the C++ object vtable hierarchy.
+ 	     Reconstruct it for later use during GC.  */
+ 	case R_MIPS_GNU_VTINHERIT:
+@@ -7771,20 +7793,20 @@ _bfd_mips_elf_check_relocs (bfd *abfd, s
+ 
+       /* We must not create a stub for a symbol that has relocations
+ 	 related to taking the function's address.  This doesn't apply to
+-	 VxWorks, where CALL relocs refer to a .got.plt entry instead of
+-	 a normal .got entry.  */
++	 VxWorks or the non-PIC ABI, where CALL relocs refer to a
++	 .got.plt entry instead of a normal .got entry.  */
+       if (!htab->is_vxworks && h != NULL)
+ 	switch (r_type)
+ 	  {
+-	  default:
+-	    ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
+-	    break;
+ 	  case R_MIPS16_CALL16:
+ 	  case R_MIPS_CALL16:
+ 	  case R_MIPS_CALL_HI16:
+ 	  case R_MIPS_CALL_LO16:
+ 	  case R_MIPS_JALR:
+ 	    break;
++	  default:
++	    ((struct mips_elf_link_hash_entry *) h)->no_fn_stub = TRUE;
++	    break;
+ 	  }
+ 
+       /* See if this reloc would need to refer to a MIPS16 hard-float stub,
+@@ -12458,7 +12480,9 @@ _bfd_mips_elf_merge_private_bfd_data (bf
+ 	  break;
+ 	}
+     }
+-  if (null_input_bfd)
++  /* Dynamic objects normally have no sections, and do not reach
++     here - but they might if used as DYNOBJ.  */
++  if (null_input_bfd || (ibfd->flags & DYNAMIC) != 0)
+     return TRUE;
+ 
+   ok = TRUE;
+--- a/bfd/elfxx-mips.h
++++ b/bfd/elfxx-mips.h
+@@ -63,6 +63,9 @@ extern bfd_boolean _bfd_mips_elf_finish_
+ extern bfd_boolean _bfd_mips_vxworks_finish_dynamic_symbol
+   (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
+    Elf_Internal_Sym *);
++extern bfd_boolean _bfd_mips_nonpic_finish_dynamic_symbol
++  (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
++   Elf_Internal_Sym *);
+ extern bfd_boolean _bfd_mips_elf_finish_dynamic_sections
+   (bfd *, struct bfd_link_info *);
+ extern void _bfd_mips_elf_final_write_processing
+@@ -153,6 +156,15 @@ extern const struct bfd_elf_special_sect
+ 
+ extern bfd_boolean _bfd_mips_elf_common_definition (Elf_Internal_Sym *);
+ 
++extern bfd_vma _bfd_mips_elf_plt_sym_val
++  (bfd_vma, const asection *, const arelent *);
++extern void _bfd_mips_elf_begin_write_processing
++  (bfd *abfd, struct bfd_link_info *link_info);
++extern bfd_boolean bfd_mips_elf_maybe_create_non_pic_to_pic_stubs_section
++  (struct bfd_link_info *);
++extern void _bfd_mips_post_process_headers
++  (bfd *abfd, struct bfd_link_info *link_info);
++
+ #define elf_backend_common_definition   _bfd_mips_elf_common_definition
+ #define elf_backend_name_local_section_symbols \
+   _bfd_mips_elf_name_local_section_symbols
+--- a/gas/config/tc-mips.c
++++ b/gas/config/tc-mips.c
+@@ -1874,6 +1874,12 @@ md_begin (void)
+ 	as_bad (_("-G may not be used in position-independent code"));
+       g_switch_value = 0;
+     }
++  else if (mips_abicalls)
++    {
++      if (g_switch_seen && g_switch_value != 0)
++	as_bad (_("-G may not be used with abicalls"));
++      g_switch_value = 0;
++    }
+ 
+   if (! bfd_set_arch_mach (stdoutput, bfd_arch_mips, file_mips_arch))
+     as_warn (_("Could not set architecture and machine"));
+@@ -11254,6 +11260,8 @@ struct option md_longopts[] =
+   {"mno-pdr", no_argument, NULL, OPTION_NO_PDR},
+ #define OPTION_MVXWORKS_PIC (OPTION_ELF_BASE + 12)
+   {"mvxworks-pic", no_argument, NULL, OPTION_MVXWORKS_PIC},
++#define OPTION_NON_PIC_ABICALLS (OPTION_ELF_BASE + 13)
++  {"mnon-pic-abicalls", no_argument, NULL, OPTION_NON_PIC_ABICALLS},
+ #endif /* OBJ_ELF */
+ 
+   {NULL, no_argument, NULL, 0}
+@@ -11672,6 +11680,11 @@ md_parse_option (int c, char *arg)
+     case OPTION_MVXWORKS_PIC:
+       mips_pic = VXWORKS_PIC;
+       break;
++
++    case OPTION_NON_PIC_ABICALLS:
++      mips_pic = NO_PIC;
++      mips_abicalls = TRUE;
++      break;
+ #endif /* OBJ_ELF */
+ 
+     default: