1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
29 #include "coff/internal.h"
37 /* Macros for manipulation the bits in the flags field of the coff data
39 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
40 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
41 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
42 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
43 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
44 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
45 | (flgs | F_APCS_SET))
46 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
47 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
48 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
49 (coff_data (abfd)->flags & ~ F_INTERWORK) \
50 | (flg | F_INTERWORK_SET))
53 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
56 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
57 /* some typedefs for holding instructions */
58 typedef unsigned long int insn32;
59 typedef unsigned short int insn16;
61 /* Forward declarations for stupid compilers. */
62 static boolean coff_arm_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 struct internal_reloc *, struct internal_syment *, asection **));
65 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type aoutarm_fix_pcrel_26
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_23
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_thumb_pcrel_12
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static bfd_reloc_status_type coff_thumb_pcrel_9
74 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
75 static bfd_reloc_status_type coff_arm_reloc
76 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
77 static boolean coff_arm_adjust_symndx
78 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
79 asection *, struct internal_reloc *, boolean *));
80 static reloc_howto_type * coff_arm_rtype_to_howto
81 PARAMS ((bfd *, asection *, struct internal_reloc *,
82 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
83 static bfd_reloc_status_type coff_thumb_pcrel_common
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
85 thumb_pcrel_branchtype));
86 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
87 PARAMS ((bfd *, bfd_reloc_code_real_type));
88 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
90 static insn32 insert_thumb_branch
91 PARAMS ((insn32, int));
92 static struct coff_link_hash_entry * find_thumb_glue
93 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
94 static struct coff_link_hash_entry * find_arm_glue
95 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
96 #ifndef COFF_IMAGE_WITH_PE
97 static void record_arm_to_thumb_glue
98 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
99 static void record_thumb_to_arm_glue
100 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
102 static boolean coff_arm_merge_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_print_private_bfd_data
105 PARAMS ((bfd *, PTR));
106 static boolean _bfd_coff_arm_set_private_flags
107 PARAMS ((bfd *, flagword));
108 static boolean coff_arm_copy_private_bfd_data
109 PARAMS ((bfd *, bfd *));
110 static boolean coff_arm_is_local_label_name
111 PARAMS ((bfd *, const char *));
112 static boolean coff_arm_link_output_has_begun
113 PARAMS ((bfd *, struct coff_final_link_info *));
114 static boolean coff_arm_final_link_postscript
115 PARAMS ((bfd *, struct coff_final_link_info *));
117 /* The linker script knows the section names for placement.
118 The entry_names are used to do simple name mangling on the stubs.
119 Given a function name, and its type, the stub can be found. The
120 name can be changed. The only requirement is the %s be present.
123 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
124 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
126 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
127 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
129 /* Used by the assembler. */
130 static bfd_reloc_status_type
131 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
134 arelent *reloc_entry;
135 asymbol *symbol ATTRIBUTE_UNUSED;
137 asection *input_section ATTRIBUTE_UNUSED;
139 char **error_message ATTRIBUTE_UNUSED;
142 if (output_bfd == (bfd *) NULL)
143 return bfd_reloc_continue;
145 diff = reloc_entry->addend;
148 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
152 reloc_howto_type *howto = reloc_entry->howto;
153 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
159 char x = bfd_get_8 (abfd, addr);
161 bfd_put_8 (abfd, x, addr);
167 short x = bfd_get_16 (abfd, addr);
169 bfd_put_16 (abfd, x, addr);
175 long x = bfd_get_32 (abfd, addr);
177 bfd_put_32 (abfd, x, addr);
186 /* Now let bfd_perform_relocation finish everything up. */
187 return bfd_reloc_continue;
190 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
191 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
193 #ifndef TARGET_UNDERSCORE
194 #define TARGET_UNDERSCORE '_'
198 #define PCRELOFFSET true
201 /* These most certainly belong somewhere else. Just had to get rid of
202 the manifest constants in the code. */
215 #define ARM_THUMB9 12
216 #define ARM_THUMB12 13
217 #define ARM_THUMB23 14
229 #define ARM_THUMB12 4
231 #define ARM_SECTION 14
232 #define ARM_SECREL 15
235 static reloc_howto_type aoutarm_std_reloc_howto[] =
237 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
246 complain_overflow_bitfield,
259 complain_overflow_bitfield,
272 complain_overflow_signed,
273 aoutarm_fix_pcrel_26 ,
285 complain_overflow_signed,
286 coff_thumb_pcrel_12 ,
298 complain_overflow_dont,
299 aoutarm_fix_pcrel_26_done,
319 complain_overflow_bitfield,
332 complain_overflow_bitfield,
339 #else /* not ARM_WINCE */
340 HOWTO(ARM_8, /* type */
344 false, /* pc_relative */
346 complain_overflow_bitfield, /* complain_on_overflow */
347 coff_arm_reloc, /* special_function */
349 true, /* partial_inplace */
350 0x000000ff, /* src_mask */
351 0x000000ff, /* dst_mask */
352 PCRELOFFSET /* pcrel_offset */),
359 complain_overflow_bitfield,
372 complain_overflow_bitfield,
385 complain_overflow_signed,
386 aoutarm_fix_pcrel_26 ,
398 complain_overflow_signed,
411 complain_overflow_signed,
424 complain_overflow_signed,
437 complain_overflow_dont,
438 aoutarm_fix_pcrel_26_done,
452 complain_overflow_bitfield,
465 complain_overflow_bitfield,
478 complain_overflow_bitfield,
491 complain_overflow_signed,
504 complain_overflow_signed,
505 coff_thumb_pcrel_12 ,
517 complain_overflow_signed,
518 coff_thumb_pcrel_23 ,
524 #endif /* not ARM_WINCE */
527 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
530 /* Return true if this relocation should
531 appear in the output .reloc section. */
534 in_reloc_p (abfd, howto)
535 bfd * abfd ATTRIBUTE_UNUSED;
536 reloc_howto_type * howto;
538 return !howto->pc_relative && howto->type != ARM_RVA32;
542 #define RTYPE2HOWTO(cache_ptr, dst) \
543 (cache_ptr)->howto = \
544 (dst)->r_type < NUM_RELOCS \
545 ? aoutarm_std_reloc_howto + (dst)->r_type \
548 #define coff_rtype_to_howto coff_arm_rtype_to_howto
550 static reloc_howto_type *
551 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
552 bfd *abfd ATTRIBUTE_UNUSED;
554 struct internal_reloc *rel;
555 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
556 struct internal_syment *sym ATTRIBUTE_UNUSED;
559 reloc_howto_type * howto;
561 if (rel->r_type >= NUM_RELOCS)
564 howto = aoutarm_std_reloc_howto + rel->r_type;
566 if (rel->r_type == ARM_RVA32)
567 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
571 /* Used by the assembler. */
573 static bfd_reloc_status_type
574 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
575 output_bfd, error_message)
576 bfd *abfd ATTRIBUTE_UNUSED;
577 arelent *reloc_entry ATTRIBUTE_UNUSED;
578 asymbol *symbol ATTRIBUTE_UNUSED;
579 PTR data ATTRIBUTE_UNUSED;
580 asection *input_section ATTRIBUTE_UNUSED;
581 bfd *output_bfd ATTRIBUTE_UNUSED;
582 char **error_message ATTRIBUTE_UNUSED;
584 /* This is dead simple at present. */
588 /* Used by the assembler. */
590 static bfd_reloc_status_type
591 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
592 output_bfd, error_message)
594 arelent *reloc_entry;
597 asection *input_section;
599 char **error_message ATTRIBUTE_UNUSED;
602 bfd_size_type addr = reloc_entry->address;
603 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
604 bfd_reloc_status_type flag = bfd_reloc_ok;
606 /* If this is an undefined symbol, return error */
607 if (symbol->section == &bfd_und_section
608 && (symbol->flags & BSF_WEAK) == 0)
609 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
611 /* If the sections are different, and we are doing a partial relocation,
612 just ignore it for now. */
613 if (symbol->section->name != input_section->name
614 && output_bfd != (bfd *)NULL)
615 return bfd_reloc_continue;
617 relocation = (target & 0x00ffffff) << 2;
618 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
619 relocation += symbol->value;
620 relocation += symbol->section->output_section->vma;
621 relocation += symbol->section->output_offset;
622 relocation += reloc_entry->addend;
623 relocation -= input_section->output_section->vma;
624 relocation -= input_section->output_offset;
628 return bfd_reloc_overflow;
630 /* Check for overflow */
631 if (relocation & 0x02000000)
633 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
634 flag = bfd_reloc_overflow;
636 else if (relocation & ~0x03ffffff)
637 flag = bfd_reloc_overflow;
639 target &= ~0x00ffffff;
640 target |= (relocation >> 2) & 0x00ffffff;
641 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
643 /* Now the ARM magic... Change the reloc type so that it is marked as done.
644 Strictly this is only necessary if we are doing a partial relocation. */
645 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
650 static bfd_reloc_status_type
651 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
652 output_bfd, error_message, btype)
654 arelent *reloc_entry;
657 asection *input_section;
659 char **error_message ATTRIBUTE_UNUSED;
660 thumb_pcrel_branchtype btype;
662 bfd_vma relocation = 0;
663 bfd_size_type addr = reloc_entry->address;
664 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
665 bfd_reloc_status_type flag = bfd_reloc_ok;
670 /* NOTE: This routine is currently used by GAS, but not by the link
678 signbit = 0x00000100;
684 signbit = 0x00000800;
690 signbit = 0x00400000;
697 /* If this is an undefined symbol, return error */
698 if (symbol->section == &bfd_und_section
699 && (symbol->flags & BSF_WEAK) == 0)
700 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
702 /* If the sections are different, and we are doing a partial relocation,
703 just ignore it for now. */
704 if (symbol->section->name != input_section->name
705 && output_bfd != (bfd *)NULL)
706 return bfd_reloc_continue;
712 relocation = ((target & dstmsk) << 1);
716 if (bfd_big_endian (abfd))
717 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
719 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
726 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
727 relocation += symbol->value;
728 relocation += symbol->section->output_section->vma;
729 relocation += symbol->section->output_offset;
730 relocation += reloc_entry->addend;
731 relocation -= input_section->output_section->vma;
732 relocation -= input_section->output_offset;
736 return bfd_reloc_overflow;
738 /* Check for overflow */
739 if (relocation & signbit)
741 if ((relocation & ~offmsk) != ~offmsk)
742 flag = bfd_reloc_overflow;
744 else if (relocation & ~offmsk)
745 flag = bfd_reloc_overflow;
752 target |= (relocation >> 1);
756 if (bfd_big_endian (abfd))
757 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
759 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
766 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
768 /* Now the ARM magic... Change the reloc type so that it is marked as done.
769 Strictly this is only necessary if we are doing a partial relocation. */
770 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
772 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
776 static bfd_reloc_status_type
777 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
778 output_bfd, error_message)
780 arelent *reloc_entry;
783 asection *input_section;
785 char **error_message;
787 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
788 input_section, output_bfd, error_message, b23);
791 static bfd_reloc_status_type
792 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
793 output_bfd, error_message)
795 arelent *reloc_entry;
798 asection *input_section;
800 char **error_message;
802 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
803 input_section, output_bfd, error_message, b12);
806 static bfd_reloc_status_type
807 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
808 output_bfd, error_message)
810 arelent *reloc_entry;
813 asection *input_section;
815 char **error_message;
817 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
818 input_section, output_bfd, error_message, b9);
821 static CONST struct reloc_howto_struct *
822 coff_arm_reloc_type_lookup (abfd, code)
824 bfd_reloc_code_real_type code;
826 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
828 if (code == BFD_RELOC_CTOR)
829 switch (bfd_get_arch_info (abfd)->bits_per_address)
834 default: return (CONST struct reloc_howto_struct *) 0;
840 ASTD (BFD_RELOC_32, ARM_32);
841 ASTD (BFD_RELOC_RVA, ARM_RVA32);
842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
843 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
845 ASTD (BFD_RELOC_8, ARM_8);
846 ASTD (BFD_RELOC_16, ARM_16);
847 ASTD (BFD_RELOC_32, ARM_32);
848 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
849 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
850 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
851 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
852 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
853 ASTD (BFD_RELOC_RVA, ARM_RVA32);
854 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
856 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
857 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
859 default: return (CONST struct reloc_howto_struct *) 0;
863 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
864 #define COFF_PAGE_SIZE 0x1000
865 /* Turn a howto into a reloc nunmber */
867 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
868 #define BADMAG(x) ARMBADMAG(x)
869 #define ARM 1 /* Customize coffcode.h */
871 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
872 This allows us to store global data here without actually creating any
873 global variables, which is a no-no in the BFD world. */
874 struct coff_arm_link_hash_table
876 /* The original coff_link_hash_table structure. MUST be first field. */
877 struct coff_link_hash_table root;
879 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
880 long int thumb_glue_size;
882 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
883 long int arm_glue_size;
885 /* An arbitary input BFD chosen to hold the glue sections. */
886 bfd * bfd_of_glue_owner;
888 /* Support interworking with old, non-interworking aware ARM code. */
889 int support_old_code;
892 /* Get the ARM coff linker hash table from a link_info structure. */
893 #define coff_arm_hash_table(info) \
894 ((struct coff_arm_link_hash_table *) ((info)->hash))
896 /* Create an ARM coff linker hash table. */
898 static struct bfd_link_hash_table *
899 coff_arm_link_hash_table_create (abfd)
902 struct coff_arm_link_hash_table * ret;
904 ret = ((struct coff_arm_link_hash_table *)
905 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
906 if (ret == (struct coff_arm_link_hash_table *) NULL)
909 if (! _bfd_coff_link_hash_table_init
910 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
912 bfd_release (abfd, ret);
913 return (struct bfd_link_hash_table *) NULL;
916 ret->thumb_glue_size = 0;
917 ret->arm_glue_size = 0;
918 ret->bfd_of_glue_owner = NULL;
920 return & ret->root.root;
924 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
925 struct bfd_link_info *info;
927 asection *input_section;
928 bfd_vma reloc_offset;
930 bfd_vma addr = reloc_offset
932 + input_section->output_offset
933 + input_section->output_section->vma;
935 if (coff_data(output_bfd)->pe)
936 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
937 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
941 /* The thumb form of a long branch is a bit finicky, because the offset
942 encoding is split over two fields, each in it's own instruction. They
943 can occur in any order. So given a thumb form of long branch, and an
944 offset, insert the offset into the thumb branch and return finished
947 It takes two thumb instructions to encode the target address. Each has
948 11 bits to invest. The upper 11 bits are stored in one (identifed by
949 H-0.. see below), the lower 11 bits are stored in the other (identified
952 Combine together and shifted left by 1 (it's a half word address) and
956 H-0, upper address-0 = 000
958 H-1, lower address-0 = 800
960 They can be ordered either way, but the arm tools I've seen always put
961 the lower one first. It probably doesn't matter. krk@cygnus.com
963 XXX: Actually the order does matter. The second instruction (H-1)
964 moves the computed address into the PC, so it must be the second one
965 in the sequence. The problem, however is that whilst little endian code
966 stores the instructions in HI then LOW order, big endian code does the
967 reverse. nickc@cygnus.com */
969 #define LOW_HI_ORDER 0xF800F000
970 #define HI_LOW_ORDER 0xF000F800
973 insert_thumb_branch (br_insn, rel_off)
977 unsigned int low_bits;
978 unsigned int high_bits;
980 BFD_ASSERT((rel_off & 1) != 1);
982 rel_off >>= 1; /* half word aligned address */
983 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
984 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
986 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
987 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
988 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
989 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
991 abort (); /* error - not a valid branch instruction form */
993 /* FIXME: abort is probably not the right call. krk@cygnus.com */
998 static struct coff_link_hash_entry *
999 find_thumb_glue (info, name, input_bfd)
1000 struct bfd_link_info * info;
1005 struct coff_link_hash_entry * myh;
1007 tmp_name = ((char *)
1008 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1010 BFD_ASSERT (tmp_name);
1012 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1014 myh = coff_link_hash_lookup
1015 (coff_hash_table (info), tmp_name, false, false, true);
1018 /* xgettext:c-format */
1019 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1020 bfd_get_filename (input_bfd), tmp_name, name);
1027 static struct coff_link_hash_entry *
1028 find_arm_glue (info, name, input_bfd)
1029 struct bfd_link_info * info;
1034 struct coff_link_hash_entry * myh;
1036 tmp_name = ((char *)
1037 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1039 BFD_ASSERT (tmp_name);
1041 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1043 myh = coff_link_hash_lookup
1044 (coff_hash_table (info), tmp_name, false, false, true);
1047 /* xgettext:c-format */
1048 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1049 bfd_get_filename (input_bfd), tmp_name, name);
1061 ldr r12, __func_addr
1064 .word func @ behave as if you saw a ARM_32 reloc
1067 #define ARM2THUMB_GLUE_SIZE 12
1068 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1069 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1070 static const insn32 a2t3_func_addr_insn = 0x00000001;
1073 Thumb->ARM: Thumb->(non-interworking aware) ARM
1077 __func_from_thumb: __func_from_thumb:
1079 nop ldr r6, __func_addr
1081 __func_change_to_arm: bx r6
1083 __func_back_to_thumb:
1090 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1091 static const insn16 t2a1_bx_pc_insn = 0x4778;
1092 static const insn16 t2a2_noop_insn = 0x46c0;
1093 static const insn32 t2a3_b_insn = 0xea000000;
1095 static const insn16 t2a1_push_insn = 0xb540;
1096 static const insn16 t2a2_ldr_insn = 0x4e03;
1097 static const insn16 t2a3_mov_insn = 0x46fe;
1098 static const insn16 t2a4_bx_insn = 0x4730;
1099 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1100 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1103 We should really create new local (static) symbols in destination
1104 object for each stub we create. We should also create local
1105 (static) symbols within the stubs when switching between ARM and
1106 Thumb code. This will ensure that the debugger and disassembler
1107 can present a better view of stubs.
1109 We can treat stubs like literal sections, and for the THUMB9 ones
1110 (short addressing range) we should be able to insert the stubs
1111 between sections. i.e. the simplest approach (since relocations
1112 are done on a section basis) is to dump the stubs at the end of
1113 processing a section. That way we can always try and minimise the
1114 offset to and from a stub. However, this does not map well onto
1115 the way that the linker/BFD does its work: mapping all input
1116 sections to output sections via the linker script before doing
1119 Unfortunately it may be easier to just to disallow short range
1120 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1121 only branch-and-link (BL) calls. This will simplify the processing
1122 since we can then put all of the stubs into their own section.
1125 On a different subject, rather than complaining when a
1126 branch cannot fit in the number of bits available for the
1127 instruction we should generate a trampoline stub (needed to
1128 address the complete 32bit address space). */
1130 /* The standard COFF backend linker does not cope with the special
1131 Thumb BRANCH23 relocation. The alternative would be to split the
1132 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1133 bit simpler simply providing our own relocation driver. */
1135 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1136 This code is a very slightly modified copy of
1137 _bfd_coff_generic_relocate_section. It would be a much more
1138 maintainable solution to have a MACRO that could be expanded within
1139 _bfd_coff_generic_relocate_section that would only be provided for
1140 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1141 is different from the original. */
1144 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1145 contents, relocs, syms, sections)
1147 struct bfd_link_info *info;
1149 asection *input_section;
1151 struct internal_reloc *relocs;
1152 struct internal_syment *syms;
1153 asection **sections;
1155 struct internal_reloc * rel;
1156 struct internal_reloc * relend;
1159 relend = rel + input_section->reloc_count;
1161 for (; rel < relend; rel++)
1165 struct coff_link_hash_entry * h;
1166 struct internal_syment * sym;
1169 reloc_howto_type * howto;
1170 bfd_reloc_status_type rstat;
1173 symndx = rel->r_symndx;
1182 h = obj_coff_sym_hashes (input_bfd)[symndx];
1183 sym = syms + symndx;
1186 /* COFF treats common symbols in one of two ways. Either the
1187 size of the symbol is included in the section contents, or it
1188 is not. We assume that the size is not included, and force
1189 the rtype_to_howto function to adjust the addend as needed. */
1191 if (sym != NULL && sym->n_scnum != 0)
1192 addend = - sym->n_value;
1196 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1201 /* The relocation_section function will skip pcrel_offset relocs
1202 when doing a relocateable link. However, we want to convert
1203 ARM26 to ARM26D relocs if possible. We return a fake howto in
1204 this case without pcrel_offset set, and adjust the addend to
1206 if (rel->r_type == ARM_26
1208 && info->relocateable
1209 && (h->root.type == bfd_link_hash_defined
1210 || h->root.type == bfd_link_hash_defweak)
1211 && h->root.u.def.section->output_section == input_section->output_section)
1213 static reloc_howto_type fake_arm26_reloc =
1220 complain_overflow_signed,
1221 aoutarm_fix_pcrel_26 ,
1228 addend -= rel->r_vaddr - input_section->vma;
1229 howto = &fake_arm26_reloc;
1233 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1234 the next opcode's pc, so is off by one. */
1235 if (howto->pc_relative && !info->relocateable)
1239 /* If we are doing a relocateable link, then we can just ignore
1240 a PC relative reloc that is pcrel_offset. It will already
1241 have the correct value. If this is not a relocateable link,
1242 then we should ignore the symbol value. */
1243 if (howto->pc_relative && howto->pcrel_offset)
1245 if (info->relocateable)
1247 #if 0 /* We must not ignore the symbol value. If the symbol is
1248 within the same section, the relocation should have already
1249 been fixed, but if it is not, we'll be handed a reloc into
1250 the beginning of the symbol's section, so we must not cancel
1251 out the symbol's value, otherwise we'll be adding it in
1253 if (sym != NULL && sym->n_scnum != 0)
1254 addend += sym->n_value;
1266 sec = bfd_abs_section_ptr;
1271 sec = sections[symndx];
1272 val = (sec->output_section->vma
1273 + sec->output_offset
1280 #if 1 /* THUMBEXTENSION */
1281 /* We don't output the stubs if we are generating a
1282 relocatable output file, since we may as well leave the
1283 stub generation to the final linker pass. If we fail to
1284 verify that the name is defined, we'll try to build stubs
1285 for an undefined name... */
1286 if (! info->relocateable
1287 && ( h->root.type == bfd_link_hash_defined
1288 || h->root.type == bfd_link_hash_defweak))
1290 asection * h_sec = h->root.u.def.section;
1291 const char * name = h->root.root.string;
1293 /* h locates the symbol referenced in the reloc. */
1294 h_val = (h->root.u.def.value
1295 + h_sec->output_section->vma
1296 + h_sec->output_offset);
1298 if (howto->type == ARM_26)
1300 if ( h->class == C_THUMBSTATFUNC
1301 || h->class == C_THUMBEXTFUNC)
1303 /* Arm code calling a Thumb function */
1304 unsigned long int tmp;
1307 long int ret_offset;
1308 struct coff_link_hash_entry * myh;
1309 struct coff_arm_link_hash_table * globals;
1311 myh = find_arm_glue (info, name, input_bfd);
1315 globals = coff_arm_hash_table (info);
1317 BFD_ASSERT (globals != NULL);
1318 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1320 my_offset = myh->root.u.def.value;
1322 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1323 ARM2THUMB_GLUE_SECTION_NAME);
1324 BFD_ASSERT (s != NULL);
1325 BFD_ASSERT (s->contents != NULL);
1326 BFD_ASSERT (s->output_section != NULL);
1328 if ((my_offset & 0x01) == 0x01)
1330 if (h_sec->owner != NULL
1331 && INTERWORK_SET (h_sec->owner)
1332 && ! INTERWORK_FLAG (h_sec->owner))
1335 /* xgettext:c-format */
1336 (_("%s(%s): warning: interworking not enabled."),
1337 bfd_get_filename (h_sec->owner), name);
1339 /* xgettext:c-format */
1340 (_(" first occurrence: %s: arm call to thumb"),
1341 bfd_get_filename (input_bfd));
1345 myh->root.u.def.value = my_offset;
1347 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1348 s->contents + my_offset);
1350 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1351 s->contents + my_offset + 4);
1353 /* It's a thumb address. Add the low order bit. */
1354 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1355 s->contents + my_offset + 8);
1357 if (info->base_file)
1358 arm_emit_base_file_entry (info, output_bfd, s,
1363 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1365 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1366 - input_section->vma);
1368 tmp = tmp & 0xFF000000;
1370 /* Somehow these are both 4 too far, so subtract 8. */
1374 + s->output_section->vma
1375 - (input_section->output_offset
1376 + input_section->output_section->vma
1380 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1382 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1383 - input_section->vma);
1389 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1390 else if (howto->type == ARM_THUMB23)
1392 if ( h->class == C_EXT
1393 || h->class == C_STAT
1394 || h->class == C_LABEL)
1396 /* Thumb code calling an ARM function */
1399 unsigned long int tmp;
1400 long int ret_offset;
1401 struct coff_link_hash_entry * myh;
1402 struct coff_arm_link_hash_table * globals;
1404 myh = find_thumb_glue (info, name, input_bfd);
1408 globals = coff_arm_hash_table (info);
1410 BFD_ASSERT (globals != NULL);
1411 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1413 my_offset = myh->root.u.def.value;
1415 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1416 THUMB2ARM_GLUE_SECTION_NAME);
1418 BFD_ASSERT (s != NULL);
1419 BFD_ASSERT (s->contents != NULL);
1420 BFD_ASSERT (s->output_section != NULL);
1422 if ((my_offset & 0x01) == 0x01)
1424 if (h_sec->owner != NULL
1425 && INTERWORK_SET (h_sec->owner)
1426 && ! INTERWORK_FLAG (h_sec->owner)
1427 && ! globals->support_old_code)
1430 /* xgettext:c-format */
1431 (_("%s(%s): warning: interworking not enabled."),
1432 bfd_get_filename (h_sec->owner), name);
1434 /* xgettext:c-format */
1435 (_(" first occurrence: %s: thumb call to arm"),
1436 bfd_get_filename (input_bfd));
1438 (_(" consider relinking with --support-old-code enabled"));
1442 myh->root.u.def.value = my_offset;
1444 if (globals->support_old_code)
1446 bfd_put_16 (output_bfd, t2a1_push_insn,
1447 s->contents + my_offset);
1449 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1450 s->contents + my_offset + 2);
1452 bfd_put_16 (output_bfd, t2a3_mov_insn,
1453 s->contents + my_offset + 4);
1455 bfd_put_16 (output_bfd, t2a4_bx_insn,
1456 s->contents + my_offset + 6);
1458 bfd_put_32 (output_bfd, t2a5_pop_insn,
1459 s->contents + my_offset + 8);
1461 bfd_put_32 (output_bfd, t2a6_bx_insn,
1462 s->contents + my_offset + 12);
1464 /* Store the address of the function in the last word of the stub. */
1465 bfd_put_32 (output_bfd, h_val,
1466 s->contents + my_offset + 16);
1468 if (info->base_file)
1469 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1473 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1474 s->contents + my_offset);
1476 bfd_put_16 (output_bfd, t2a2_noop_insn,
1477 s->contents + my_offset + 2);
1480 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1482 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1483 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1484 + s->output_section->vma) /* Address of the start of the current section. */
1485 + 4 /* The branch instruction is 4 bytes into the stub. */
1486 + 8); /* ARM branches work from the pc of the instruction + 8. */
1488 bfd_put_32 (output_bfd,
1489 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1490 s->contents + my_offset + 4);
1495 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1497 /* Now go back and fix up the original BL insn to point
1502 - (input_section->output_offset
1506 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1507 - input_section->vma);
1509 bfd_put_32 (output_bfd,
1510 insert_thumb_branch (tmp, ret_offset),
1511 contents + rel->r_vaddr
1512 - input_section->vma);
1520 /* If the relocation type and destination symbol does not
1521 fall into one of the above categories, then we can just
1522 perform a direct link. */
1525 rstat = bfd_reloc_ok;
1527 #endif /* THUMBEXTENSION */
1528 if ( h->root.type == bfd_link_hash_defined
1529 || h->root.type == bfd_link_hash_defweak)
1533 sec = h->root.u.def.section;
1534 val = (h->root.u.def.value
1535 + sec->output_section->vma
1536 + sec->output_offset);
1539 else if (! info->relocateable)
1541 if (! ((*info->callbacks->undefined_symbol)
1542 (info, h->root.root.string, input_bfd, input_section,
1543 rel->r_vaddr - input_section->vma, true)))
1548 if (info->base_file)
1550 /* Emit a reloc if the backend thinks it needs it. */
1551 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1552 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1555 #if 1 /* THUMBEXTENSION */
1557 rstat = bfd_reloc_ok;
1559 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1560 else if (! info->relocateable
1561 && howto->type == ARM_THUMB23)
1563 /* This is pretty much a copy of what the default
1564 _bfd_final_link_relocate and _bfd_relocate_contents
1565 routines do to perform a relocation, with special
1566 processing for the split addressing of the Thumb BL
1567 instruction. Again, it would probably be simpler adding a
1568 ThumbBRANCH23 specific macro expansion into the default
1571 bfd_vma address = rel->r_vaddr - input_section->vma;
1573 if (address > input_section->_raw_size)
1574 rstat = bfd_reloc_outofrange;
1577 bfd_vma relocation = val + addend;
1578 int size = bfd_get_reloc_size (howto);
1579 boolean overflow = false;
1580 bfd_byte * location = contents + address;
1581 bfd_vma x = bfd_get_32 (input_bfd, location);
1582 bfd_vma src_mask = 0x007FFFFE;
1583 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1584 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1586 bfd_signed_vma signed_check;
1588 bfd_signed_vma signed_add;
1590 BFD_ASSERT (size == 4);
1592 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1593 relocation -= (input_section->output_section->vma
1594 + input_section->output_offset);
1596 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1597 relocation -= address;
1599 /* No need to negate the relocation with BRANCH23. */
1600 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1601 /* howto->rightshift == 1 */
1603 /* Drop unwanted bits from the value we are relocating to. */
1604 check = relocation >> howto->rightshift;
1606 /* If this is a signed value, the rightshift just dropped
1607 leading 1 bits (assuming twos complement). */
1608 if ((bfd_signed_vma) relocation >= 0)
1609 signed_check = check;
1611 signed_check = (check
1613 & ~((bfd_vma) - 1 >> howto->rightshift)));
1615 /* Get the value from the object file. */
1616 if (bfd_big_endian (input_bfd))
1617 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1619 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1621 /* Get the value from the object file with an appropriate sign.
1622 The expression involving howto->src_mask isolates the upper
1623 bit of src_mask. If that bit is set in the value we are
1624 adding, it is negative, and we subtract out that number times
1625 two. If src_mask includes the highest possible bit, then we
1626 can not get the upper bit, but that does not matter since
1627 signed_add needs no adjustment to become negative in that
1631 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1632 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1634 /* howto->bitpos == 0 */
1635 /* Add the value from the object file, shifted so that it is a
1637 signed_check += signed_add;
1638 relocation += signed_add;
1640 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1642 /* Assumes two's complement. */
1643 if ( signed_check > reloc_signed_max
1644 || signed_check < reloc_signed_min)
1647 /* For the BLX(1) instruction remove bit 0 of the adjusted offset.
1648 Bit 0 can only be set if the upper insn is at a half-word boundary,
1649 since the destination address, an ARM instruction, must always be
1650 on a word boundary. The semantics of the BLX (1) instruction,
1651 however, are that bit 0 in the offset must always be 0, and the
1652 corresponding bit 1 in the target address will be set from bit
1653 1 of the source address. */
1654 if ((x & 0x18000000) == 0x08000000)
1657 /* Put the relocation into the correct bits. */
1658 if (bfd_big_endian (input_bfd))
1659 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1661 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1663 /* Add the relocation to the correct bits of X. */
1664 x = ((x & ~howto->dst_mask) | relocation);
1666 /* Put the relocated value back in the object file. */
1667 bfd_put_32 (input_bfd, x, location);
1669 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1674 #endif /* THUMBEXTENSION */
1675 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1677 rel->r_vaddr - input_section->vma,
1679 #if 1 /* THUMBEXTENSION */
1681 Is this the best way to fix up thumb addresses? krk@cygnus.com
1682 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1683 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1684 if (! info->relocateable
1685 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1687 /* Determine if we need to set the bottom bit of a relocated address
1688 because the address is the address of a Thumb code symbol. */
1690 int patchit = false;
1693 && ( h->class == C_THUMBSTATFUNC
1694 || h->class == C_THUMBEXTFUNC))
1698 else if (sym != NULL
1699 && sym->n_scnum > N_UNDEF)
1701 /* No hash entry - use the symbol instead. */
1703 if ( sym->n_sclass == C_THUMBSTATFUNC
1704 || sym->n_sclass == C_THUMBEXTFUNC)
1710 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1711 bfd_vma x = bfd_get_32 (input_bfd, location);
1713 bfd_put_32 (input_bfd, x | 1, location);
1716 #endif /* THUMBEXTENSION */
1724 case bfd_reloc_outofrange:
1725 (*_bfd_error_handler)
1726 (_("%s: bad reloc address 0x%lx in section `%s'"),
1727 bfd_get_filename (input_bfd),
1728 (unsigned long) rel->r_vaddr,
1729 bfd_get_section_name (input_bfd, input_section));
1731 case bfd_reloc_overflow:
1734 char buf[SYMNMLEN + 1];
1739 name = h->root.root.string;
1742 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1747 if (! ((*info->callbacks->reloc_overflow)
1748 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1749 input_section, rel->r_vaddr - input_section->vma)))
1758 #ifndef COFF_IMAGE_WITH_PE
1761 bfd_arm_allocate_interworking_sections (info)
1762 struct bfd_link_info * info;
1766 struct coff_arm_link_hash_table * globals;
1768 static char test_char = '1';
1771 globals = coff_arm_hash_table (info);
1773 BFD_ASSERT (globals != NULL);
1775 if (globals->arm_glue_size != 0)
1777 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1779 s = bfd_get_section_by_name
1780 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1782 BFD_ASSERT (s != NULL);
1784 foo = (bfd_byte *) bfd_alloc
1785 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1787 memset (foo, test_char, globals->arm_glue_size);
1790 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1794 if (globals->thumb_glue_size != 0)
1796 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1798 s = bfd_get_section_by_name
1799 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1801 BFD_ASSERT (s != NULL);
1803 foo = (bfd_byte *) bfd_alloc
1804 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1806 memset (foo, test_char, globals->thumb_glue_size);
1809 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1817 record_arm_to_thumb_glue (info, h)
1818 struct bfd_link_info * info;
1819 struct coff_link_hash_entry * h;
1821 const char * name = h->root.root.string;
1822 register asection * s;
1824 struct coff_link_hash_entry * myh;
1825 struct coff_arm_link_hash_table * globals;
1827 globals = coff_arm_hash_table (info);
1829 BFD_ASSERT (globals != NULL);
1830 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1832 s = bfd_get_section_by_name
1833 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1835 BFD_ASSERT (s != NULL);
1837 tmp_name = ((char *)
1838 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1840 BFD_ASSERT (tmp_name);
1842 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1844 myh = coff_link_hash_lookup
1845 (coff_hash_table (info), tmp_name, false, false, true);
1850 return; /* we've already seen this guy */
1853 /* The only trick here is using globals->arm_glue_size as the value. Even
1854 though the section isn't allocated yet, this is where we will be putting
1857 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1859 s, globals->arm_glue_size + 1,
1861 (struct bfd_link_hash_entry **) & myh);
1865 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1871 record_thumb_to_arm_glue (info, h)
1872 struct bfd_link_info * info;
1873 struct coff_link_hash_entry * h;
1875 const char * name = h->root.root.string;
1876 register asection * s;
1878 struct coff_link_hash_entry * myh;
1879 struct coff_arm_link_hash_table * globals;
1881 globals = coff_arm_hash_table (info);
1883 BFD_ASSERT (globals != NULL);
1884 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1886 s = bfd_get_section_by_name
1887 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1889 BFD_ASSERT (s != NULL);
1891 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1893 BFD_ASSERT (tmp_name);
1895 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1897 myh = coff_link_hash_lookup
1898 (coff_hash_table (info), tmp_name, false, false, true);
1903 return; /* we've already seen this guy */
1906 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1907 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1909 (struct bfd_link_hash_entry **) & myh);
1911 /* If we mark it 'thumb', the disassembler will do a better job. */
1912 myh->class = C_THUMBEXTFUNC;
1916 /* Allocate another symbol to mark where we switch to arm mode. */
1918 #define CHANGE_TO_ARM "__%s_change_to_arm"
1919 #define BACK_FROM_ARM "__%s_back_from_arm"
1921 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1923 BFD_ASSERT (tmp_name);
1925 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1929 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1930 BSF_LOCAL, s, globals->thumb_glue_size
1931 + (globals->support_old_code ? 8 : 4),
1933 (struct bfd_link_hash_entry **) & myh);
1937 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1942 /* Select a BFD to be used to hold the sections used by the glue code.
1943 This function is called from the linker scripts in ld/emultempl/
1947 bfd_arm_get_bfd_for_interworking (abfd, info)
1949 struct bfd_link_info * info;
1951 struct coff_arm_link_hash_table * globals;
1955 /* If we are only performing a partial link do not bother
1956 getting a bfd to hold the glue. */
1957 if (info->relocateable)
1960 globals = coff_arm_hash_table (info);
1962 BFD_ASSERT (globals != NULL);
1964 if (globals->bfd_of_glue_owner != NULL)
1967 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1971 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1973 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1976 || ! bfd_set_section_flags (abfd, sec, flags)
1977 || ! bfd_set_section_alignment (abfd, sec, 2))
1981 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1985 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1987 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1990 || ! bfd_set_section_flags (abfd, sec, flags)
1991 || ! bfd_set_section_alignment (abfd, sec, 2))
1995 /* Save the bfd for later use. */
1996 globals->bfd_of_glue_owner = abfd;
2002 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2004 struct bfd_link_info * info;
2005 int support_old_code;
2008 struct coff_arm_link_hash_table * globals;
2010 /* If we are only performing a partial link do not bother
2011 to construct any glue. */
2012 if (info->relocateable)
2015 /* Here we have a bfd that is to be included on the link. We have a hook
2016 to do reloc rummaging, before section sizes are nailed down. */
2018 _bfd_coff_get_external_symbols (abfd);
2020 globals = coff_arm_hash_table (info);
2022 BFD_ASSERT (globals != NULL);
2023 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2025 globals->support_old_code = support_old_code;
2027 /* Rummage around all the relocs and map the glue vectors. */
2028 sec = abfd->sections;
2033 for (; sec != NULL; sec = sec->next)
2035 struct internal_reloc * i;
2036 struct internal_reloc * rel;
2038 if (sec->reloc_count == 0)
2041 /* Load the relocs. */
2042 /* FIXME: there may be a storage leak here. */
2044 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2046 BFD_ASSERT (i != 0);
2048 for (rel = i; rel < i + sec->reloc_count; ++rel)
2050 unsigned short r_type = rel->r_type;
2052 struct coff_link_hash_entry * h;
2054 symndx = rel->r_symndx;
2056 /* If the relocation is not against a symbol it cannot concern us. */
2060 /* If the index is outside of the range of our table, something has gone wrong. */
2061 if (symndx >= obj_conv_table_size (abfd))
2063 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2064 bfd_get_filename (abfd), symndx);
2068 h = obj_coff_sym_hashes (abfd)[symndx];
2070 /* If the relocation is against a static symbol it must be within
2071 the current section and so cannot be a cross ARM/Thumb relocation. */
2078 /* This one is a call from arm code. We need to look up
2079 the target of the call. If it is a thumb target, we
2082 if (h->class == C_THUMBEXTFUNC)
2083 record_arm_to_thumb_glue (info, h);
2088 /* This one is a call from thumb code. We used to look
2089 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2090 up the target of the call. If it is an arm target, we
2091 insert glue. If the symbol does not exist it will be
2092 given a class of C_EXT and so we will generate a stub
2093 for it. This is not really a problem, since the link
2094 is doomed anyway. */
2101 record_thumb_to_arm_glue (info, h);
2118 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2120 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2121 #define coff_relocate_section coff_arm_relocate_section
2122 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2123 #define coff_adjust_symndx coff_arm_adjust_symndx
2124 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2125 #define coff_final_link_postscript coff_arm_final_link_postscript
2126 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2127 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2128 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2129 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2130 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2132 /* When doing a relocateable link, we want to convert ARM26 relocs
2133 into ARM26D relocs. */
2136 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2137 bfd *obfd ATTRIBUTE_UNUSED;
2138 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2141 struct internal_reloc *irel;
2144 if (irel->r_type == 3)
2146 struct coff_link_hash_entry *h;
2148 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2150 && (h->root.type == bfd_link_hash_defined
2151 || h->root.type == bfd_link_hash_defweak)
2152 && h->root.u.def.section->output_section == sec->output_section)
2159 /* Called when merging the private data areas of two BFDs.
2160 This is important as it allows us to detect if we are
2161 attempting to merge binaries compiled for different ARM
2162 targets, eg different CPUs or differents APCS's. */
2165 coff_arm_merge_private_bfd_data (ibfd, obfd)
2169 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2174 /* If the two formats are different we cannot merge anything.
2175 This is not an error, since it is permissable to change the
2176 input and output formats. */
2177 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2178 || obfd->xvec->flavour != bfd_target_coff_flavour)
2181 /* Verify that the APCS is the same for the two BFDs */
2182 if (APCS_SET (ibfd))
2184 if (APCS_SET (obfd))
2186 /* If the src and dest have different APCS flag bits set, fail. */
2187 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2190 /* xgettext: c-format */
2191 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2192 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2193 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2196 bfd_set_error (bfd_error_wrong_format);
2200 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2204 if (APCS_FLOAT_FLAG (ibfd))
2205 /* xgettext: c-format */
2206 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2208 /* xgettext: c-format */
2209 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2211 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2212 bfd_get_filename (obfd));
2214 bfd_set_error (bfd_error_wrong_format);
2218 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2222 if (PIC_FLAG (ibfd))
2223 /* xgettext: c-format */
2224 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2226 /* xgettext: c-format */
2227 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2228 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2229 bfd_get_filename (obfd));
2231 bfd_set_error (bfd_error_wrong_format);
2237 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2239 /* Set up the arch and fields as well as these are probably wrong. */
2240 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2244 /* Check the interworking support. */
2245 if (INTERWORK_SET (ibfd))
2247 if (INTERWORK_SET (obfd))
2249 /* If the src and dest differ in their interworking issue a warning. */
2250 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2254 if (INTERWORK_FLAG (ibfd))
2255 /* xgettext: c-format */
2256 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2258 /* xgettext: c-format */
2259 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2261 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2262 bfd_get_filename (obfd));
2267 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2274 /* Display the flags field. */
2277 coff_arm_print_private_bfd_data (abfd, ptr)
2281 FILE * file = (FILE *) ptr;
2283 BFD_ASSERT (abfd != NULL && ptr != NULL);
2285 /* xgettext:c-format */
2286 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2288 if (APCS_SET (abfd))
2290 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2291 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2293 if (APCS_FLOAT_FLAG (abfd))
2294 fprintf (file, _(" [floats passed in float registers]"));
2296 fprintf (file, _(" [floats passed in integer registers]"));
2298 if (PIC_FLAG (abfd))
2299 fprintf (file, _(" [position independent]"));
2301 fprintf (file, _(" [absolute position]"));
2304 if (! INTERWORK_SET (abfd))
2305 fprintf (file, _(" [interworking flag not initialised]"));
2306 else if (INTERWORK_FLAG (abfd))
2307 fprintf (file, _(" [interworking supported]"));
2309 fprintf (file, _(" [interworking not supported]"));
2316 /* Copies the given flags into the coff_tdata.flags field.
2317 Typically these flags come from the f_flags[] field of
2318 the COFF filehdr structure, which contains important,
2319 target specific information.
2320 Note: Although this function is static, it is explicitly
2321 called from both coffcode.h and peicode.h. */
2324 _bfd_coff_arm_set_private_flags (abfd, flags)
2330 BFD_ASSERT (abfd != NULL);
2332 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2334 /* Make sure that the APCS field has not been initialised to the opposite
2337 && ( (APCS_26_FLAG (abfd) != flag)
2338 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2339 || (PIC_FLAG (abfd) != (flags & F_PIC))
2343 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2345 SET_APCS_FLAGS (abfd, flag);
2347 flag = (flags & F_INTERWORK);
2349 /* If the BFD has already had its interworking flag set, but it
2350 is different from the value that we have been asked to set,
2351 then assume that that merged code will not support interworking
2352 and set the flag accordingly. */
2353 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2356 /* xgettext: c-format */
2357 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2358 bfd_get_filename (abfd));
2360 /* xgettext: c-format */
2361 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2362 bfd_get_filename (abfd));
2366 SET_INTERWORK_FLAG (abfd, flag);
2371 /* Copy the important parts of the target specific data
2372 from one instance of a BFD to another. */
2375 coff_arm_copy_private_bfd_data (src, dest)
2379 BFD_ASSERT (src != NULL && dest != NULL);
2384 /* If the destination is not in the same format as the source, do not do
2386 if (src->xvec != dest->xvec)
2389 /* copy the flags field */
2392 if (APCS_SET (dest))
2394 /* If the src and dest have different APCS flag bits set, fail. */
2395 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2398 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2401 if (PIC_FLAG (dest) != PIC_FLAG (src))
2405 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2409 if (INTERWORK_SET (src))
2411 if (INTERWORK_SET (dest))
2413 /* If the src and dest have different interworking flags then turn
2414 off the interworking bit. */
2415 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2417 if (INTERWORK_FLAG (dest))
2419 /* xgettext:c-format */
2420 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2421 bfd_get_filename (dest),
2422 bfd_get_filename (src));
2425 SET_INTERWORK_FLAG (dest, 0);
2430 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2437 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2438 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2439 #define LOCAL_LABEL_PREFIX ""
2440 #ifndef USER_LABEL_PREFIX
2441 #define USER_LABEL_PREFIX "_"
2444 /* Like _bfd_coff_is_local_label_name, but
2445 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2447 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2448 labels of the form Lxxx to be stripped. */
2450 coff_arm_is_local_label_name (abfd, name)
2451 bfd * abfd ATTRIBUTE_UNUSED;
2454 #ifdef USER_LABEL_PREFIX
2455 if (USER_LABEL_PREFIX[0] != 0)
2457 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2462 #ifdef LOCAL_LABEL_PREFIX
2463 /* If there is a prefix for local labels then look for this.
2464 If the prefix exists, but it is empty, then ignore the test. */
2466 if (LOCAL_LABEL_PREFIX[0] != 0)
2468 int len = strlen (LOCAL_LABEL_PREFIX);
2470 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2473 /* Perform the checks below for the rest of the name. */
2478 return name[0] == 'L';
2481 /* This piece of machinery exists only to guarantee that the bfd that holds
2482 the glue section is written last.
2484 This does depend on bfd_make_section attaching a new section to the
2485 end of the section list for the bfd.
2490 coff_arm_link_output_has_begun (sub, info)
2492 struct coff_final_link_info * info;
2494 return (sub->output_has_begun
2495 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2499 coff_arm_final_link_postscript (abfd, pfinfo)
2500 bfd * abfd ATTRIBUTE_UNUSED;
2501 struct coff_final_link_info * pfinfo;
2503 struct coff_arm_link_hash_table * globals;
2505 globals = coff_arm_hash_table (pfinfo->info);
2507 BFD_ASSERT (globals != NULL);
2509 if (globals->bfd_of_glue_owner != NULL)
2511 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2514 globals->bfd_of_glue_owner->output_has_begun = true;
2520 #include "coffcode.h"
2522 #ifndef TARGET_LITTLE_SYM
2523 #define TARGET_LITTLE_SYM armcoff_little_vec
2525 #ifndef TARGET_LITTLE_NAME
2526 #define TARGET_LITTLE_NAME "coff-arm-little"
2528 #ifndef TARGET_BIG_SYM
2529 #define TARGET_BIG_SYM armcoff_big_vec
2531 #ifndef TARGET_BIG_NAME
2532 #define TARGET_BIG_NAME "coff-arm-big"
2535 #ifndef TARGET_UNDERSCORE
2536 #define TARGET_UNDERSCORE 0
2539 #ifndef EXTRA_S_FLAGS
2541 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2543 #define EXTRA_S_FLAGS 0
2547 /* Forward declaration for use initialising alternative_target field. */
2548 extern const bfd_target TARGET_BIG_SYM ;
2550 /* Target vectors. */
2551 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2552 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)