1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005
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) \
40 (coff_data (abfd)->flags & F_APCS_26)
42 #define APCS_FLOAT_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_APCS_FLOAT)
45 #define PIC_FLAG(abfd) \
46 (coff_data (abfd)->flags & F_PIC)
48 #define APCS_SET(abfd) \
49 (coff_data (abfd)->flags & F_APCS_SET)
51 #define SET_APCS_FLAGS(abfd, flgs) \
54 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
55 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
59 #define INTERWORK_FLAG(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK)
62 #define INTERWORK_SET(abfd) \
63 (coff_data (abfd)->flags & F_INTERWORK_SET)
65 #define SET_INTERWORK_FLAG(abfd, flg) \
68 coff_data (abfd)->flags &= ~F_INTERWORK; \
69 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
74 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
77 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
78 /* some typedefs for holding instructions */
79 typedef unsigned long int insn32;
80 typedef unsigned short int insn16;
82 /* Forward declarations for stupid compilers. */
83 static bfd_boolean coff_arm_relocate_section
84 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
85 struct internal_reloc *, struct internal_syment *, asection **));
86 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
87 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
88 static bfd_reloc_status_type aoutarm_fix_pcrel_26
89 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
91 static bfd_reloc_status_type coff_thumb_pcrel_23
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93 static bfd_reloc_status_type coff_thumb_pcrel_9
94 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
95 static insn32 insert_thumb_branch
96 PARAMS ((insn32, int));
98 static bfd_reloc_status_type coff_thumb_pcrel_12
99 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
100 static bfd_reloc_status_type coff_arm_reloc
101 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
102 static bfd_boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, bfd_boolean *));
105 static reloc_howto_type * coff_arm_rtype_to_howto
106 PARAMS ((bfd *, asection *, struct internal_reloc *,
107 struct coff_link_hash_entry *, struct internal_syment *,
109 static bfd_reloc_status_type coff_thumb_pcrel_common
110 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
111 thumb_pcrel_branchtype));
112 static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
113 PARAMS ((bfd *, bfd_reloc_code_real_type));
114 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
117 static struct coff_link_hash_entry * find_thumb_glue
118 PARAMS ((struct bfd_link_info *, const char *, bfd *));
120 static struct coff_link_hash_entry * find_arm_glue
121 PARAMS ((struct bfd_link_info *, const char *, bfd *));
122 #ifndef COFF_IMAGE_WITH_PE
123 static void record_arm_to_thumb_glue
124 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
126 static void record_thumb_to_arm_glue
127 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
130 static bfd_boolean coff_arm_merge_private_bfd_data
131 PARAMS ((bfd *, bfd *));
132 static bfd_boolean coff_arm_print_private_bfd_data
133 PARAMS ((bfd *, PTR));
134 static bfd_boolean _bfd_coff_arm_set_private_flags
135 PARAMS ((bfd *, flagword));
136 static bfd_boolean coff_arm_copy_private_bfd_data
137 PARAMS ((bfd *, bfd *));
138 static bfd_boolean coff_arm_is_local_label_name
139 PARAMS ((bfd *, const char *));
140 static bfd_boolean coff_arm_link_output_has_begun
141 PARAMS ((bfd *, struct coff_final_link_info *));
142 static bfd_boolean coff_arm_final_link_postscript
143 PARAMS ((bfd *, struct coff_final_link_info *));
144 static void arm_emit_base_file_entry
145 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
147 /* The linker script knows the section names for placement.
148 The entry_names are used to do simple name mangling on the stubs.
149 Given a function name, and its type, the stub can be found. The
150 name can be changed. The only requirement is the %s be present. */
152 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
153 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
155 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
156 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
158 /* Used by the assembler. */
160 static bfd_reloc_status_type
161 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
164 arelent *reloc_entry;
165 asymbol *symbol ATTRIBUTE_UNUSED;
167 asection *input_section ATTRIBUTE_UNUSED;
169 char **error_message ATTRIBUTE_UNUSED;
172 if (output_bfd == (bfd *) NULL)
173 return bfd_reloc_continue;
175 diff = reloc_entry->addend;
178 x = ((x & ~howto->dst_mask) \
179 | (((x & howto->src_mask) + diff) & howto->dst_mask))
183 reloc_howto_type *howto = reloc_entry->howto;
184 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
190 char x = bfd_get_8 (abfd, addr);
192 bfd_put_8 (abfd, x, addr);
198 short x = bfd_get_16 (abfd, addr);
200 bfd_put_16 (abfd, (bfd_vma) x, addr);
206 long x = bfd_get_32 (abfd, addr);
208 bfd_put_32 (abfd, (bfd_vma) x, addr);
217 /* Now let bfd_perform_relocation finish everything up. */
218 return bfd_reloc_continue;
221 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
222 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
224 #ifndef TARGET_UNDERSCORE
225 #define TARGET_UNDERSCORE '_'
229 #define PCRELOFFSET TRUE
232 /* These most certainly belong somewhere else. Just had to get rid of
233 the manifest constants in the code. */
246 #define ARM_THUMB9 12
247 #define ARM_THUMB12 13
248 #define ARM_THUMB23 14
261 #define ARM_THUMB12 4
262 #define ARM_SECTION 14
263 #define ARM_SECREL 15
266 static reloc_howto_type aoutarm_std_reloc_howto[] =
275 complain_overflow_dont,
276 aoutarm_fix_pcrel_26_done,
288 complain_overflow_bitfield,
301 complain_overflow_bitfield,
314 complain_overflow_signed,
315 aoutarm_fix_pcrel_26 ,
327 complain_overflow_signed,
328 coff_thumb_pcrel_12 ,
349 complain_overflow_bitfield,
362 complain_overflow_bitfield,
369 #else /* not ARM_WINCE */
370 HOWTO (ARM_8, /* type */
374 FALSE, /* pc_relative */
376 complain_overflow_bitfield, /* complain_on_overflow */
377 coff_arm_reloc, /* special_function */
379 TRUE, /* partial_inplace */
380 0x000000ff, /* src_mask */
381 0x000000ff, /* dst_mask */
382 PCRELOFFSET /* pcrel_offset */),
389 complain_overflow_bitfield,
402 complain_overflow_bitfield,
415 complain_overflow_signed,
416 aoutarm_fix_pcrel_26 ,
428 complain_overflow_signed,
441 complain_overflow_signed,
454 complain_overflow_signed,
467 complain_overflow_dont,
468 aoutarm_fix_pcrel_26_done,
482 complain_overflow_bitfield,
495 complain_overflow_bitfield,
508 complain_overflow_bitfield,
521 complain_overflow_signed,
534 complain_overflow_signed,
535 coff_thumb_pcrel_12 ,
547 complain_overflow_signed,
548 coff_thumb_pcrel_23 ,
554 #endif /* not ARM_WINCE */
557 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
560 static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
561 /* Return TRUE if this relocation should
562 appear in the output .reloc section. */
565 in_reloc_p (abfd, howto)
566 bfd * abfd ATTRIBUTE_UNUSED;
567 reloc_howto_type * howto;
569 return !howto->pc_relative && howto->type != ARM_RVA32;
573 #define RTYPE2HOWTO(cache_ptr, dst) \
574 (cache_ptr)->howto = \
575 (dst)->r_type < NUM_RELOCS \
576 ? aoutarm_std_reloc_howto + (dst)->r_type \
579 #define coff_rtype_to_howto coff_arm_rtype_to_howto
581 static reloc_howto_type *
582 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
583 bfd *abfd ATTRIBUTE_UNUSED;
585 struct internal_reloc *rel;
586 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
587 struct internal_syment *sym ATTRIBUTE_UNUSED;
590 reloc_howto_type * howto;
592 if (rel->r_type >= NUM_RELOCS)
595 howto = aoutarm_std_reloc_howto + rel->r_type;
597 if (rel->r_type == ARM_RVA32)
598 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
603 /* Used by the assembler. */
605 static bfd_reloc_status_type
606 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
607 output_bfd, error_message)
608 bfd *abfd ATTRIBUTE_UNUSED;
609 arelent *reloc_entry ATTRIBUTE_UNUSED;
610 asymbol *symbol ATTRIBUTE_UNUSED;
611 PTR data ATTRIBUTE_UNUSED;
612 asection *input_section ATTRIBUTE_UNUSED;
613 bfd *output_bfd ATTRIBUTE_UNUSED;
614 char **error_message ATTRIBUTE_UNUSED;
616 /* This is dead simple at present. */
620 /* Used by the assembler. */
622 static bfd_reloc_status_type
623 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
624 output_bfd, error_message)
626 arelent *reloc_entry;
629 asection *input_section;
631 char **error_message ATTRIBUTE_UNUSED;
634 bfd_size_type addr = reloc_entry->address;
635 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
636 bfd_reloc_status_type flag = bfd_reloc_ok;
638 /* If this is an undefined symbol, return error. */
639 if (symbol->section == &bfd_und_section
640 && (symbol->flags & BSF_WEAK) == 0)
641 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
643 /* If the sections are different, and we are doing a partial relocation,
644 just ignore it for now. */
645 if (symbol->section->name != input_section->name
646 && output_bfd != (bfd *)NULL)
647 return bfd_reloc_continue;
649 relocation = (target & 0x00ffffff) << 2;
650 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
651 relocation += symbol->value;
652 relocation += symbol->section->output_section->vma;
653 relocation += symbol->section->output_offset;
654 relocation += reloc_entry->addend;
655 relocation -= input_section->output_section->vma;
656 relocation -= input_section->output_offset;
660 return bfd_reloc_overflow;
662 /* Check for overflow. */
663 if (relocation & 0x02000000)
665 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
666 flag = bfd_reloc_overflow;
668 else if (relocation & ~(bfd_vma) 0x03ffffff)
669 flag = bfd_reloc_overflow;
671 target &= ~0x00ffffff;
672 target |= (relocation >> 2) & 0x00ffffff;
673 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
675 /* Now the ARM magic... Change the reloc type so that it is marked as done.
676 Strictly this is only necessary if we are doing a partial relocation. */
677 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
682 static bfd_reloc_status_type
683 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
684 output_bfd, error_message, btype)
686 arelent *reloc_entry;
689 asection *input_section;
691 char **error_message ATTRIBUTE_UNUSED;
692 thumb_pcrel_branchtype btype;
694 bfd_vma relocation = 0;
695 bfd_size_type addr = reloc_entry->address;
696 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
697 bfd_reloc_status_type flag = bfd_reloc_ok;
702 /* NOTE: This routine is currently used by GAS, but not by the link
710 signbit = 0x00000100;
716 signbit = 0x00000800;
722 signbit = 0x00400000;
729 /* If this is an undefined symbol, return error. */
730 if (symbol->section == &bfd_und_section
731 && (symbol->flags & BSF_WEAK) == 0)
732 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
734 /* If the sections are different, and we are doing a partial relocation,
735 just ignore it for now. */
736 if (symbol->section->name != input_section->name
737 && output_bfd != (bfd *)NULL)
738 return bfd_reloc_continue;
744 relocation = ((target & dstmsk) << 1);
748 if (bfd_big_endian (abfd))
749 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
751 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
758 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
759 relocation += symbol->value;
760 relocation += symbol->section->output_section->vma;
761 relocation += symbol->section->output_offset;
762 relocation += reloc_entry->addend;
763 relocation -= input_section->output_section->vma;
764 relocation -= input_section->output_offset;
768 return bfd_reloc_overflow;
770 /* Check for overflow. */
771 if (relocation & signbit)
773 if ((relocation & ~offmsk) != ~offmsk)
774 flag = bfd_reloc_overflow;
776 else if (relocation & ~offmsk)
777 flag = bfd_reloc_overflow;
784 target |= (relocation >> 1);
788 if (bfd_big_endian (abfd))
789 target |= (((relocation & 0xfff) >> 1)
790 | ((relocation << 4) & 0x07ff0000));
792 target |= (((relocation & 0xffe) << 15)
793 | ((relocation >> 12) & 0x7ff));
800 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
802 /* Now the ARM magic... Change the reloc type so that it is marked as done.
803 Strictly this is only necessary if we are doing a partial relocation. */
804 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
806 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
811 static bfd_reloc_status_type
812 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
813 output_bfd, error_message)
815 arelent *reloc_entry;
818 asection *input_section;
820 char **error_message;
822 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
823 input_section, output_bfd, error_message,
827 static bfd_reloc_status_type
828 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
829 output_bfd, error_message)
831 arelent *reloc_entry;
834 asection *input_section;
836 char **error_message;
838 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
839 input_section, output_bfd, error_message,
842 #endif /* not ARM_WINCE */
844 static bfd_reloc_status_type
845 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
846 output_bfd, error_message)
848 arelent *reloc_entry;
851 asection *input_section;
853 char **error_message;
855 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
856 input_section, output_bfd, error_message,
860 static const struct reloc_howto_struct *
861 coff_arm_reloc_type_lookup (abfd, code)
863 bfd_reloc_code_real_type code;
865 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
867 if (code == BFD_RELOC_CTOR)
868 switch (bfd_get_arch_info (abfd)->bits_per_address)
874 return (const struct reloc_howto_struct *) 0;
880 ASTD (BFD_RELOC_32, ARM_32);
881 ASTD (BFD_RELOC_RVA, ARM_RVA32);
882 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
883 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
885 ASTD (BFD_RELOC_8, ARM_8);
886 ASTD (BFD_RELOC_16, ARM_16);
887 ASTD (BFD_RELOC_32, ARM_32);
888 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
889 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
890 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
891 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
892 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
893 ASTD (BFD_RELOC_RVA, ARM_RVA32);
894 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
895 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
896 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
897 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
899 default: return (const struct reloc_howto_struct *) 0;
903 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
904 #define COFF_PAGE_SIZE 0x1000
905 /* Turn a howto into a reloc nunmber */
907 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
908 #define BADMAG(x) ARMBADMAG(x)
909 #define ARM 1 /* Customize coffcode.h */
912 /* Make sure that the 'r_offset' field is copied properly
913 so that identical binaries will compare the same. */
914 #define SWAP_IN_RELOC_OFFSET H_GET_32
915 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
918 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
919 This allows us to store global data here without actually creating any
920 global variables, which is a no-no in the BFD world. */
921 struct coff_arm_link_hash_table
923 /* The original coff_link_hash_table structure. MUST be first field. */
924 struct coff_link_hash_table root;
926 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
927 bfd_size_type thumb_glue_size;
929 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
930 bfd_size_type arm_glue_size;
932 /* An arbitrary input BFD chosen to hold the glue sections. */
933 bfd * bfd_of_glue_owner;
935 /* Support interworking with old, non-interworking aware ARM code. */
936 int support_old_code;
939 /* Get the ARM coff linker hash table from a link_info structure. */
940 #define coff_arm_hash_table(info) \
941 ((struct coff_arm_link_hash_table *) ((info)->hash))
943 /* Create an ARM coff linker hash table. */
945 static struct bfd_link_hash_table *
946 coff_arm_link_hash_table_create (abfd)
949 struct coff_arm_link_hash_table * ret;
950 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
952 ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
953 if (ret == (struct coff_arm_link_hash_table *) NULL)
956 if (! _bfd_coff_link_hash_table_init
957 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
960 return (struct bfd_link_hash_table *) NULL;
963 ret->thumb_glue_size = 0;
964 ret->arm_glue_size = 0;
965 ret->bfd_of_glue_owner = NULL;
967 return & ret->root.root;
971 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
972 struct bfd_link_info *info;
974 asection *input_section;
975 bfd_vma reloc_offset;
977 bfd_vma addr = reloc_offset
979 + input_section->output_offset
980 + input_section->output_section->vma;
982 if (coff_data (output_bfd)->pe)
983 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
984 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
989 /* The thumb form of a long branch is a bit finicky, because the offset
990 encoding is split over two fields, each in it's own instruction. They
991 can occur in any order. So given a thumb form of long branch, and an
992 offset, insert the offset into the thumb branch and return finished
995 It takes two thumb instructions to encode the target address. Each has
996 11 bits to invest. The upper 11 bits are stored in one (identified by
997 H-0.. see below), the lower 11 bits are stored in the other (identified
1000 Combine together and shifted left by 1 (it's a half word address) and
1004 H-0, upper address-0 = 000
1006 H-1, lower address-0 = 800
1008 They can be ordered either way, but the arm tools I've seen always put
1009 the lower one first. It probably doesn't matter. krk@cygnus.com
1011 XXX: Actually the order does matter. The second instruction (H-1)
1012 moves the computed address into the PC, so it must be the second one
1013 in the sequence. The problem, however is that whilst little endian code
1014 stores the instructions in HI then LOW order, big endian code does the
1015 reverse. nickc@cygnus.com. */
1017 #define LOW_HI_ORDER 0xF800F000
1018 #define HI_LOW_ORDER 0xF000F800
1021 insert_thumb_branch (br_insn, rel_off)
1025 unsigned int low_bits;
1026 unsigned int high_bits;
1028 BFD_ASSERT((rel_off & 1) != 1);
1030 rel_off >>= 1; /* half word aligned address */
1031 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1032 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1034 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1035 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1036 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1037 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1039 /* FIXME: the BFD library should never abort except for internal errors
1040 - it should return an error status. */
1041 abort (); /* Error - not a valid branch instruction form. */
1047 static struct coff_link_hash_entry *
1048 find_thumb_glue (info, name, input_bfd)
1049 struct bfd_link_info *info;
1054 struct coff_link_hash_entry *myh;
1055 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1057 tmp_name = (char *) bfd_malloc (amt);
1059 BFD_ASSERT (tmp_name);
1061 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1063 myh = coff_link_hash_lookup
1064 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1067 /* xgettext:c-format */
1068 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
1069 input_bfd, tmp_name, name);
1075 #endif /* not ARM_WINCE */
1077 static struct coff_link_hash_entry *
1078 find_arm_glue (info, name, input_bfd)
1079 struct bfd_link_info *info;
1084 struct coff_link_hash_entry * myh;
1085 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1087 tmp_name = (char *) bfd_malloc (amt);
1089 BFD_ASSERT (tmp_name);
1091 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1093 myh = coff_link_hash_lookup
1094 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1097 /* xgettext:c-format */
1098 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1099 input_bfd, tmp_name, name);
1111 ldr r12, __func_addr
1114 .word func @ behave as if you saw a ARM_32 reloc
1117 #define ARM2THUMB_GLUE_SIZE 12
1118 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1119 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1120 static const insn32 a2t3_func_addr_insn = 0x00000001;
1123 Thumb->ARM: Thumb->(non-interworking aware) ARM
1127 __func_from_thumb: __func_from_thumb:
1129 nop ldr r6, __func_addr
1131 __func_change_to_arm: bx r6
1133 __func_back_to_thumb:
1140 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1142 static const insn16 t2a1_bx_pc_insn = 0x4778;
1143 static const insn16 t2a2_noop_insn = 0x46c0;
1144 static const insn32 t2a3_b_insn = 0xea000000;
1146 static const insn16 t2a1_push_insn = 0xb540;
1147 static const insn16 t2a2_ldr_insn = 0x4e03;
1148 static const insn16 t2a3_mov_insn = 0x46fe;
1149 static const insn16 t2a4_bx_insn = 0x4730;
1150 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1151 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1155 We should really create new local (static) symbols in destination
1156 object for each stub we create. We should also create local
1157 (static) symbols within the stubs when switching between ARM and
1158 Thumb code. This will ensure that the debugger and disassembler
1159 can present a better view of stubs.
1161 We can treat stubs like literal sections, and for the THUMB9 ones
1162 (short addressing range) we should be able to insert the stubs
1163 between sections. i.e. the simplest approach (since relocations
1164 are done on a section basis) is to dump the stubs at the end of
1165 processing a section. That way we can always try and minimise the
1166 offset to and from a stub. However, this does not map well onto
1167 the way that the linker/BFD does its work: mapping all input
1168 sections to output sections via the linker script before doing
1171 Unfortunately it may be easier to just to disallow short range
1172 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1173 only branch-and-link (BL) calls. This will simplify the processing
1174 since we can then put all of the stubs into their own section.
1177 On a different subject, rather than complaining when a
1178 branch cannot fit in the number of bits available for the
1179 instruction we should generate a trampoline stub (needed to
1180 address the complete 32bit address space). */
1182 /* The standard COFF backend linker does not cope with the special
1183 Thumb BRANCH23 relocation. The alternative would be to split the
1184 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1185 bit simpler simply providing our own relocation driver. */
1187 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1188 This code is a very slightly modified copy of
1189 _bfd_coff_generic_relocate_section. It would be a much more
1190 maintainable solution to have a MACRO that could be expanded within
1191 _bfd_coff_generic_relocate_section that would only be provided for
1192 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1193 is different from the original. */
1196 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1197 contents, relocs, syms, sections)
1199 struct bfd_link_info *info;
1201 asection *input_section;
1203 struct internal_reloc *relocs;
1204 struct internal_syment *syms;
1205 asection **sections;
1207 struct internal_reloc * rel;
1208 struct internal_reloc * relend;
1210 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1214 relend = rel + input_section->reloc_count;
1216 for (; rel < relend; rel++)
1220 struct coff_link_hash_entry * h;
1221 struct internal_syment * sym;
1224 reloc_howto_type * howto;
1225 bfd_reloc_status_type rstat;
1228 symndx = rel->r_symndx;
1237 h = obj_coff_sym_hashes (input_bfd)[symndx];
1238 sym = syms + symndx;
1241 /* COFF treats common symbols in one of two ways. Either the
1242 size of the symbol is included in the section contents, or it
1243 is not. We assume that the size is not included, and force
1244 the rtype_to_howto function to adjust the addend as needed. */
1246 if (sym != NULL && sym->n_scnum != 0)
1247 addend = - sym->n_value;
1251 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1256 /* The relocation_section function will skip pcrel_offset relocs
1257 when doing a relocatable link. However, we want to convert
1258 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1259 this case without pcrel_offset set, and adjust the addend to
1260 compensate. 'partial_inplace' is also set, since we want 'done'
1261 relocations to be reflected in section's data. */
1262 if (rel->r_type == ARM_26
1264 && info->relocatable
1265 && (h->root.type == bfd_link_hash_defined
1266 || h->root.type == bfd_link_hash_defweak)
1267 && (h->root.u.def.section->output_section
1268 == input_section->output_section))
1270 static reloc_howto_type fake_arm26_reloc =
1277 complain_overflow_signed,
1278 aoutarm_fix_pcrel_26 ,
1285 addend -= rel->r_vaddr - input_section->vma;
1287 /* FIXME: I don't know why, but the hack is necessary for correct
1288 generation of bl's instruction offset. */
1291 howto = &fake_arm26_reloc;
1295 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1296 the next opcode's pc, so is off by one. */
1299 /* If we are doing a relocatable link, then we can just ignore
1300 a PC relative reloc that is pcrel_offset. It will already
1301 have the correct value. If this is not a relocatable link,
1302 then we should ignore the symbol value. */
1303 if (howto->pc_relative && howto->pcrel_offset)
1305 if (info->relocatable)
1307 /* FIXME - it is not clear which targets need this next test
1308 and which do not. It is known that it is needed for the
1309 VxWorks and EPOC-PE targets, but it is also known that it
1310 was suppressed for other ARM targets. This ought to be
1311 sorted out one day. */
1312 #ifdef ARM_COFF_BUGFIX
1313 /* We must not ignore the symbol value. If the symbol is
1314 within the same section, the relocation should have already
1315 been fixed, but if it is not, we'll be handed a reloc into
1316 the beginning of the symbol's section, so we must not cancel
1317 out the symbol's value, otherwise we'll be adding it in
1319 if (sym != NULL && sym->n_scnum != 0)
1320 addend += sym->n_value;
1332 sec = bfd_abs_section_ptr;
1337 sec = sections[symndx];
1338 val = (sec->output_section->vma
1339 + sec->output_offset
1346 /* We don't output the stubs if we are generating a
1347 relocatable output file, since we may as well leave the
1348 stub generation to the final linker pass. If we fail to
1349 verify that the name is defined, we'll try to build stubs
1350 for an undefined name... */
1351 if (! info->relocatable
1352 && ( h->root.type == bfd_link_hash_defined
1353 || h->root.type == bfd_link_hash_defweak))
1355 asection * h_sec = h->root.u.def.section;
1356 const char * name = h->root.root.string;
1358 /* h locates the symbol referenced in the reloc. */
1359 h_val = (h->root.u.def.value
1360 + h_sec->output_section->vma
1361 + h_sec->output_offset);
1363 if (howto->type == ARM_26)
1365 if ( h->class == C_THUMBSTATFUNC
1366 || h->class == C_THUMBEXTFUNC)
1368 /* Arm code calling a Thumb function. */
1369 unsigned long int tmp;
1372 long int ret_offset;
1373 struct coff_link_hash_entry * myh;
1374 struct coff_arm_link_hash_table * globals;
1376 myh = find_arm_glue (info, name, input_bfd);
1380 globals = coff_arm_hash_table (info);
1382 BFD_ASSERT (globals != NULL);
1383 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1385 my_offset = myh->root.u.def.value;
1387 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1388 ARM2THUMB_GLUE_SECTION_NAME);
1389 BFD_ASSERT (s != NULL);
1390 BFD_ASSERT (s->contents != NULL);
1391 BFD_ASSERT (s->output_section != NULL);
1393 if ((my_offset & 0x01) == 0x01)
1395 if (h_sec->owner != NULL
1396 && INTERWORK_SET (h_sec->owner)
1397 && ! INTERWORK_FLAG (h_sec->owner))
1399 /* xgettext:c-format */
1400 (_("%B(%s): warning: interworking not enabled.\n"
1401 " first occurrence: %B: arm call to thumb"),
1402 h_sec->owner, input_bfd, name);
1405 myh->root.u.def.value = my_offset;
1407 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1408 s->contents + my_offset);
1410 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1411 s->contents + my_offset + 4);
1413 /* It's a thumb address. Add the low order bit. */
1414 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1415 s->contents + my_offset + 8);
1417 if (info->base_file)
1418 arm_emit_base_file_entry (info, output_bfd, s,
1423 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1425 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1426 - input_section->vma);
1428 tmp = tmp & 0xFF000000;
1430 /* Somehow these are both 4 too far, so subtract 8. */
1434 + s->output_section->vma
1435 - (input_section->output_offset
1436 + input_section->output_section->vma
1440 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1442 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1443 contents + rel->r_vaddr - input_section->vma);
1449 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1450 else if (howto->type == ARM_THUMB23)
1452 if ( h->class == C_EXT
1453 || h->class == C_STAT
1454 || h->class == C_LABEL)
1456 /* Thumb code calling an ARM function */
1459 unsigned long int tmp;
1460 long int ret_offset;
1461 struct coff_link_hash_entry * myh;
1462 struct coff_arm_link_hash_table * globals;
1464 myh = find_thumb_glue (info, name, input_bfd);
1468 globals = coff_arm_hash_table (info);
1470 BFD_ASSERT (globals != NULL);
1471 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1473 my_offset = myh->root.u.def.value;
1475 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1476 THUMB2ARM_GLUE_SECTION_NAME);
1478 BFD_ASSERT (s != NULL);
1479 BFD_ASSERT (s->contents != NULL);
1480 BFD_ASSERT (s->output_section != NULL);
1482 if ((my_offset & 0x01) == 0x01)
1484 if (h_sec->owner != NULL
1485 && INTERWORK_SET (h_sec->owner)
1486 && ! INTERWORK_FLAG (h_sec->owner)
1487 && ! globals->support_old_code)
1489 /* xgettext:c-format */
1490 (_("%B(%s): warning: interworking not enabled.\n"
1491 " first occurrence: %B: thumb call to arm\n"
1492 " consider relinking with --support-old-code enabled"),
1493 h_sec->owner, input_bfd, name);
1496 myh->root.u.def.value = my_offset;
1498 if (globals->support_old_code)
1500 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1501 s->contents + my_offset);
1503 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1504 s->contents + my_offset + 2);
1506 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1507 s->contents + my_offset + 4);
1509 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1510 s->contents + my_offset + 6);
1512 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1513 s->contents + my_offset + 8);
1515 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1516 s->contents + my_offset + 12);
1518 /* Store the address of the function in the last word of the stub. */
1519 bfd_put_32 (output_bfd, h_val,
1520 s->contents + my_offset + 16);
1522 if (info->base_file)
1523 arm_emit_base_file_entry (info, output_bfd, s,
1528 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1529 s->contents + my_offset);
1531 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1532 s->contents + my_offset + 2);
1535 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1537 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1538 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1539 + s->output_section->vma) /* Address of the start of the current section. */
1540 + 4 /* The branch instruction is 4 bytes into the stub. */
1541 + 8); /* ARM branches work from the pc of the instruction + 8. */
1543 bfd_put_32 (output_bfd,
1544 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1545 s->contents + my_offset + 4);
1550 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1552 /* Now go back and fix up the original BL insn to point
1557 - (input_section->output_offset
1561 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1562 - input_section->vma);
1564 bfd_put_32 (output_bfd,
1565 (bfd_vma) insert_thumb_branch (tmp,
1567 contents + rel->r_vaddr - input_section->vma);
1575 /* If the relocation type and destination symbol does not
1576 fall into one of the above categories, then we can just
1577 perform a direct link. */
1580 rstat = bfd_reloc_ok;
1582 if ( h->root.type == bfd_link_hash_defined
1583 || h->root.type == bfd_link_hash_defweak)
1587 sec = h->root.u.def.section;
1588 val = (h->root.u.def.value
1589 + sec->output_section->vma
1590 + sec->output_offset);
1593 else if (! info->relocatable)
1595 if (! ((*info->callbacks->undefined_symbol)
1596 (info, h->root.root.string, input_bfd, input_section,
1597 rel->r_vaddr - input_section->vma, TRUE)))
1602 if (info->base_file)
1604 /* Emit a reloc if the backend thinks it needs it. */
1605 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1606 arm_emit_base_file_entry (info, output_bfd, input_section,
1611 rstat = bfd_reloc_ok;
1613 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1614 else if (! info->relocatable
1615 && howto->type == ARM_THUMB23)
1617 /* This is pretty much a copy of what the default
1618 _bfd_final_link_relocate and _bfd_relocate_contents
1619 routines do to perform a relocation, with special
1620 processing for the split addressing of the Thumb BL
1621 instruction. Again, it would probably be simpler adding a
1622 ThumbBRANCH23 specific macro expansion into the default
1625 bfd_vma address = rel->r_vaddr - input_section->vma;
1627 if (address > high_address)
1628 rstat = bfd_reloc_outofrange;
1631 bfd_vma relocation = val + addend;
1632 int size = bfd_get_reloc_size (howto);
1633 bfd_boolean overflow = FALSE;
1634 bfd_byte *location = contents + address;
1635 bfd_vma x = bfd_get_32 (input_bfd, location);
1636 bfd_vma src_mask = 0x007FFFFE;
1637 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1638 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1640 bfd_signed_vma signed_check;
1642 bfd_signed_vma signed_add;
1644 BFD_ASSERT (size == 4);
1646 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1647 relocation -= (input_section->output_section->vma
1648 + input_section->output_offset);
1650 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1651 relocation -= address;
1653 /* No need to negate the relocation with BRANCH23. */
1654 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1655 /* howto->rightshift == 1 */
1657 /* Drop unwanted bits from the value we are relocating to. */
1658 check = relocation >> howto->rightshift;
1660 /* If this is a signed value, the rightshift just dropped
1661 leading 1 bits (assuming twos complement). */
1662 if ((bfd_signed_vma) relocation >= 0)
1663 signed_check = check;
1665 signed_check = (check
1667 & ~((bfd_vma) - 1 >> howto->rightshift)));
1669 /* Get the value from the object file. */
1670 if (bfd_big_endian (input_bfd))
1671 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1673 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1675 /* Get the value from the object file with an appropriate sign.
1676 The expression involving howto->src_mask isolates the upper
1677 bit of src_mask. If that bit is set in the value we are
1678 adding, it is negative, and we subtract out that number times
1679 two. If src_mask includes the highest possible bit, then we
1680 can not get the upper bit, but that does not matter since
1681 signed_add needs no adjustment to become negative in that
1685 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1686 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1688 /* howto->bitpos == 0 */
1689 /* Add the value from the object file, shifted so that it is a
1691 signed_check += signed_add;
1692 relocation += signed_add;
1694 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1696 /* Assumes two's complement. */
1697 if ( signed_check > reloc_signed_max
1698 || signed_check < reloc_signed_min)
1701 /* Put the relocation into the correct bits.
1702 For a BLX instruction, make sure that the relocation is rounded up
1703 to a word boundary. This follows the semantics of the instruction
1704 which specifies that bit 1 of the target address will come from bit
1705 1 of the base address. */
1706 if (bfd_big_endian (input_bfd))
1708 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1710 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1714 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1716 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1719 /* Add the relocation to the correct bits of X. */
1720 x = ((x & ~howto->dst_mask) | relocation);
1722 /* Put the relocated value back in the object file. */
1723 bfd_put_32 (input_bfd, x, location);
1725 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1730 if (info->relocatable && ! howto->partial_inplace)
1731 rstat = bfd_reloc_ok;
1733 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1735 rel->r_vaddr - input_section->vma,
1738 Is this the best way to fix up thumb addresses? krk@cygnus.com
1739 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1740 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1741 if (! info->relocatable
1742 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1744 /* Determine if we need to set the bottom bit of a relocated address
1745 because the address is the address of a Thumb code symbol. */
1747 int patchit = FALSE;
1750 && ( h->class == C_THUMBSTATFUNC
1751 || h->class == C_THUMBEXTFUNC))
1755 else if (sym != NULL
1756 && sym->n_scnum > N_UNDEF)
1758 /* No hash entry - use the symbol instead. */
1760 if ( sym->n_sclass == C_THUMBSTATFUNC
1761 || sym->n_sclass == C_THUMBEXTFUNC)
1767 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1768 bfd_vma x = bfd_get_32 (input_bfd, location);
1770 bfd_put_32 (input_bfd, x | 1, location);
1780 case bfd_reloc_outofrange:
1781 (*_bfd_error_handler)
1782 (_("%B: bad reloc address 0x%lx in section `%A'"),
1783 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1785 case bfd_reloc_overflow:
1788 char buf[SYMNMLEN + 1];
1796 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1801 if (! ((*info->callbacks->reloc_overflow)
1802 (info, (h ? &h->root : NULL), name, howto->name,
1803 (bfd_vma) 0, input_bfd, input_section,
1804 rel->r_vaddr - input_section->vma)))
1813 #ifndef COFF_IMAGE_WITH_PE
1816 bfd_arm_allocate_interworking_sections (info)
1817 struct bfd_link_info * info;
1821 struct coff_arm_link_hash_table * globals;
1823 globals = coff_arm_hash_table (info);
1825 BFD_ASSERT (globals != NULL);
1827 if (globals->arm_glue_size != 0)
1829 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1831 s = bfd_get_section_by_name
1832 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1834 BFD_ASSERT (s != NULL);
1836 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1837 globals->arm_glue_size);
1839 s->size = globals->arm_glue_size;
1843 if (globals->thumb_glue_size != 0)
1845 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1847 s = bfd_get_section_by_name
1848 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1850 BFD_ASSERT (s != NULL);
1852 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1853 globals->thumb_glue_size);
1855 s->size = globals->thumb_glue_size;
1863 record_arm_to_thumb_glue (info, h)
1864 struct bfd_link_info * info;
1865 struct coff_link_hash_entry * h;
1867 const char * name = h->root.root.string;
1868 register asection * s;
1870 struct coff_link_hash_entry * myh;
1871 struct bfd_link_hash_entry * bh;
1872 struct coff_arm_link_hash_table * globals;
1876 globals = coff_arm_hash_table (info);
1878 BFD_ASSERT (globals != NULL);
1879 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1881 s = bfd_get_section_by_name
1882 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1884 BFD_ASSERT (s != NULL);
1886 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1887 tmp_name = (char *) bfd_malloc (amt);
1889 BFD_ASSERT (tmp_name);
1891 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1893 myh = coff_link_hash_lookup
1894 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1899 return; /* we've already seen this guy */
1902 /* The only trick here is using globals->arm_glue_size as the value. Even
1903 though the section isn't allocated yet, this is where we will be putting
1907 val = globals->arm_glue_size + 1;
1908 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1909 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1913 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1920 record_thumb_to_arm_glue (info, h)
1921 struct bfd_link_info * info;
1922 struct coff_link_hash_entry * h;
1924 const char * name = h->root.root.string;
1925 register asection * s;
1927 struct coff_link_hash_entry * myh;
1928 struct bfd_link_hash_entry * bh;
1929 struct coff_arm_link_hash_table * globals;
1933 globals = coff_arm_hash_table (info);
1935 BFD_ASSERT (globals != NULL);
1936 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1938 s = bfd_get_section_by_name
1939 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1941 BFD_ASSERT (s != NULL);
1943 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1944 tmp_name = (char *) bfd_malloc (amt);
1946 BFD_ASSERT (tmp_name);
1948 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1950 myh = coff_link_hash_lookup
1951 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1956 return; /* we've already seen this guy */
1960 val = globals->thumb_glue_size + 1;
1961 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1962 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1964 /* If we mark it 'thumb', the disassembler will do a better job. */
1965 myh = (struct coff_link_hash_entry *) bh;
1966 myh->class = C_THUMBEXTFUNC;
1970 /* Allocate another symbol to mark where we switch to arm mode. */
1972 #define CHANGE_TO_ARM "__%s_change_to_arm"
1973 #define BACK_FROM_ARM "__%s_back_from_arm"
1975 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1976 tmp_name = (char *) bfd_malloc (amt);
1978 BFD_ASSERT (tmp_name);
1980 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1983 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1984 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1985 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1989 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1993 #endif /* not ARM_WINCE */
1995 /* Select a BFD to be used to hold the sections used by the glue code.
1996 This function is called from the linker scripts in ld/emultempl/
2000 bfd_arm_get_bfd_for_interworking (abfd, info)
2002 struct bfd_link_info * info;
2004 struct coff_arm_link_hash_table * globals;
2008 /* If we are only performing a partial link do not bother
2009 getting a bfd to hold the glue. */
2010 if (info->relocatable)
2013 globals = coff_arm_hash_table (info);
2015 BFD_ASSERT (globals != NULL);
2017 if (globals->bfd_of_glue_owner != NULL)
2020 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2024 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2026 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2029 || ! bfd_set_section_flags (abfd, sec, flags)
2030 || ! bfd_set_section_alignment (abfd, sec, 2))
2034 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2038 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2040 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2043 || ! bfd_set_section_flags (abfd, sec, flags)
2044 || ! bfd_set_section_alignment (abfd, sec, 2))
2048 /* Save the bfd for later use. */
2049 globals->bfd_of_glue_owner = abfd;
2055 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2057 struct bfd_link_info * info;
2058 int support_old_code;
2061 struct coff_arm_link_hash_table * globals;
2063 /* If we are only performing a partial link do not bother
2064 to construct any glue. */
2065 if (info->relocatable)
2068 /* Here we have a bfd that is to be included on the link. We have a hook
2069 to do reloc rummaging, before section sizes are nailed down. */
2071 _bfd_coff_get_external_symbols (abfd);
2073 globals = coff_arm_hash_table (info);
2075 BFD_ASSERT (globals != NULL);
2076 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2078 globals->support_old_code = support_old_code;
2080 /* Rummage around all the relocs and map the glue vectors. */
2081 sec = abfd->sections;
2086 for (; sec != NULL; sec = sec->next)
2088 struct internal_reloc * i;
2089 struct internal_reloc * rel;
2091 if (sec->reloc_count == 0)
2094 /* Load the relocs. */
2095 /* FIXME: there may be a storage leak here. */
2097 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2099 BFD_ASSERT (i != 0);
2101 for (rel = i; rel < i + sec->reloc_count; ++rel)
2103 unsigned short r_type = rel->r_type;
2105 struct coff_link_hash_entry * h;
2107 symndx = rel->r_symndx;
2109 /* If the relocation is not against a symbol it cannot concern us. */
2113 /* If the index is outside of the range of our table, something has gone wrong. */
2114 if (symndx >= obj_conv_table_size (abfd))
2116 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2121 h = obj_coff_sym_hashes (abfd)[symndx];
2123 /* If the relocation is against a static symbol it must be within
2124 the current section and so cannot be a cross ARM/Thumb relocation. */
2131 /* This one is a call from arm code. We need to look up
2132 the target of the call. If it is a thumb target, we
2135 if (h->class == C_THUMBEXTFUNC)
2136 record_arm_to_thumb_glue (info, h);
2141 /* This one is a call from thumb code. We used to look
2142 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2143 up the target of the call. If it is an arm target, we
2144 insert glue. If the symbol does not exist it will be
2145 given a class of C_EXT and so we will generate a stub
2146 for it. This is not really a problem, since the link
2147 is doomed anyway. */
2154 record_thumb_to_arm_glue (info, h);
2171 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2173 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2174 #define coff_relocate_section coff_arm_relocate_section
2175 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2176 #define coff_adjust_symndx coff_arm_adjust_symndx
2177 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2178 #define coff_final_link_postscript coff_arm_final_link_postscript
2179 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2180 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2181 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2182 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2183 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2185 /* When doing a relocatable link, we want to convert ARM_26 relocs
2186 into ARM_26D relocs. */
2189 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2190 bfd *obfd ATTRIBUTE_UNUSED;
2191 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2194 struct internal_reloc *irel;
2195 bfd_boolean *adjustedp;
2197 if (irel->r_type == ARM_26)
2199 struct coff_link_hash_entry *h;
2201 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2203 && (h->root.type == bfd_link_hash_defined
2204 || h->root.type == bfd_link_hash_defweak)
2205 && h->root.u.def.section->output_section == sec->output_section)
2206 irel->r_type = ARM_26D;
2212 /* Called when merging the private data areas of two BFDs.
2213 This is important as it allows us to detect if we are
2214 attempting to merge binaries compiled for different ARM
2215 targets, eg different CPUs or different APCS's. */
2218 coff_arm_merge_private_bfd_data (ibfd, obfd)
2222 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2227 /* If the two formats are different we cannot merge anything.
2228 This is not an error, since it is permissable to change the
2229 input and output formats. */
2230 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2231 || obfd->xvec->flavour != bfd_target_coff_flavour)
2234 /* Determine what should happen if the input ARM architecture
2235 does not match the output ARM architecture. */
2236 if (! bfd_arm_merge_machines (ibfd, obfd))
2239 /* Verify that the APCS is the same for the two BFDs. */
2240 if (APCS_SET (ibfd))
2242 if (APCS_SET (obfd))
2244 /* If the src and dest have different APCS flag bits set, fail. */
2245 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2248 /* xgettext: c-format */
2249 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2251 APCS_26_FLAG (ibfd) ? 26 : 32,
2252 APCS_26_FLAG (obfd) ? 26 : 32
2255 bfd_set_error (bfd_error_wrong_format);
2259 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2263 if (APCS_FLOAT_FLAG (ibfd))
2264 /* xgettext: c-format */
2265 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2267 /* xgettext: c-format */
2268 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2270 _bfd_error_handler (msg, ibfd, obfd);
2272 bfd_set_error (bfd_error_wrong_format);
2276 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2280 if (PIC_FLAG (ibfd))
2281 /* xgettext: c-format */
2282 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2284 /* xgettext: c-format */
2285 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2286 _bfd_error_handler (msg, ibfd, obfd);
2288 bfd_set_error (bfd_error_wrong_format);
2294 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2296 /* Set up the arch and fields as well as these are probably wrong. */
2297 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2301 /* Check the interworking support. */
2302 if (INTERWORK_SET (ibfd))
2304 if (INTERWORK_SET (obfd))
2306 /* If the src and dest differ in their interworking issue a warning. */
2307 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2311 if (INTERWORK_FLAG (ibfd))
2312 /* xgettext: c-format */
2313 msg = _("Warning: %B supports interworking, whereas %B does not");
2315 /* xgettext: c-format */
2316 msg = _("Warning: %B does not support interworking, whereas %B does");
2318 _bfd_error_handler (msg, ibfd, obfd);
2323 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2330 /* Display the flags field. */
2333 coff_arm_print_private_bfd_data (abfd, ptr)
2337 FILE * file = (FILE *) ptr;
2339 BFD_ASSERT (abfd != NULL && ptr != NULL);
2341 /* xgettext:c-format */
2342 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2344 if (APCS_SET (abfd))
2346 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2347 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2349 if (APCS_FLOAT_FLAG (abfd))
2350 fprintf (file, _(" [floats passed in float registers]"));
2352 fprintf (file, _(" [floats passed in integer registers]"));
2354 if (PIC_FLAG (abfd))
2355 fprintf (file, _(" [position independent]"));
2357 fprintf (file, _(" [absolute position]"));
2360 if (! INTERWORK_SET (abfd))
2361 fprintf (file, _(" [interworking flag not initialised]"));
2362 else if (INTERWORK_FLAG (abfd))
2363 fprintf (file, _(" [interworking supported]"));
2365 fprintf (file, _(" [interworking not supported]"));
2372 /* Copies the given flags into the coff_tdata.flags field.
2373 Typically these flags come from the f_flags[] field of
2374 the COFF filehdr structure, which contains important,
2375 target specific information.
2376 Note: Although this function is static, it is explicitly
2377 called from both coffcode.h and peicode.h. */
2380 _bfd_coff_arm_set_private_flags (abfd, flags)
2386 BFD_ASSERT (abfd != NULL);
2388 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2390 /* Make sure that the APCS field has not been initialised to the opposite
2393 && ( (APCS_26_FLAG (abfd) != flag)
2394 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2395 || (PIC_FLAG (abfd) != (flags & F_PIC))
2399 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2401 SET_APCS_FLAGS (abfd, flag);
2403 flag = (flags & F_INTERWORK);
2405 /* If the BFD has already had its interworking flag set, but it
2406 is different from the value that we have been asked to set,
2407 then assume that that merged code will not support interworking
2408 and set the flag accordingly. */
2409 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2412 /* xgettext: c-format */
2413 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2416 /* xgettext: c-format */
2417 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2422 SET_INTERWORK_FLAG (abfd, flag);
2427 /* Copy the important parts of the target specific data
2428 from one instance of a BFD to another. */
2431 coff_arm_copy_private_bfd_data (src, dest)
2435 BFD_ASSERT (src != NULL && dest != NULL);
2440 /* If the destination is not in the same format as the source, do not do
2442 if (src->xvec != dest->xvec)
2445 /* copy the flags field */
2448 if (APCS_SET (dest))
2450 /* If the src and dest have different APCS flag bits set, fail. */
2451 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2454 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2457 if (PIC_FLAG (dest) != PIC_FLAG (src))
2461 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2465 if (INTERWORK_SET (src))
2467 if (INTERWORK_SET (dest))
2469 /* If the src and dest have different interworking flags then turn
2470 off the interworking bit. */
2471 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2473 if (INTERWORK_FLAG (dest))
2475 /* xgettext:c-format */
2476 _bfd_error_handler (("\
2477 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2481 SET_INTERWORK_FLAG (dest, 0);
2486 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2493 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2494 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2495 #define LOCAL_LABEL_PREFIX ""
2496 #ifndef USER_LABEL_PREFIX
2497 #define USER_LABEL_PREFIX "_"
2500 /* Like _bfd_coff_is_local_label_name, but
2501 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2503 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2504 labels of the form Lxxx to be stripped. */
2506 coff_arm_is_local_label_name (abfd, name)
2507 bfd * abfd ATTRIBUTE_UNUSED;
2510 #ifdef USER_LABEL_PREFIX
2511 if (USER_LABEL_PREFIX[0] != 0)
2513 size_t len = strlen (USER_LABEL_PREFIX);
2515 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2520 #ifdef LOCAL_LABEL_PREFIX
2521 /* If there is a prefix for local labels then look for this.
2522 If the prefix exists, but it is empty, then ignore the test. */
2524 if (LOCAL_LABEL_PREFIX[0] != 0)
2526 size_t len = strlen (LOCAL_LABEL_PREFIX);
2528 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2531 /* Perform the checks below for the rest of the name. */
2536 return name[0] == 'L';
2539 /* This piece of machinery exists only to guarantee that the bfd that holds
2540 the glue section is written last.
2542 This does depend on bfd_make_section attaching a new section to the
2543 end of the section list for the bfd.
2548 coff_arm_link_output_has_begun (sub, info)
2550 struct coff_final_link_info * info;
2552 return (sub->output_has_begun
2553 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2557 coff_arm_final_link_postscript (abfd, pfinfo)
2558 bfd * abfd ATTRIBUTE_UNUSED;
2559 struct coff_final_link_info * pfinfo;
2561 struct coff_arm_link_hash_table * globals;
2563 globals = coff_arm_hash_table (pfinfo->info);
2565 BFD_ASSERT (globals != NULL);
2567 if (globals->bfd_of_glue_owner != NULL)
2569 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2572 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2575 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2578 #include "coffcode.h"
2580 #ifndef TARGET_LITTLE_SYM
2581 #define TARGET_LITTLE_SYM armcoff_little_vec
2583 #ifndef TARGET_LITTLE_NAME
2584 #define TARGET_LITTLE_NAME "coff-arm-little"
2586 #ifndef TARGET_BIG_SYM
2587 #define TARGET_BIG_SYM armcoff_big_vec
2589 #ifndef TARGET_BIG_NAME
2590 #define TARGET_BIG_NAME "coff-arm-big"
2593 #ifndef TARGET_UNDERSCORE
2594 #define TARGET_UNDERSCORE 0
2597 #ifndef EXTRA_S_FLAGS
2599 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2601 #define EXTRA_S_FLAGS SEC_CODE
2605 /* Forward declaration for use initialising alternative_target field. */
2606 extern const bfd_target TARGET_BIG_SYM ;
2608 /* Target vectors. */
2609 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2610 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)