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 *));
116 static void arm_emit_base_file_entry
117 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
119 /* The linker script knows the section names for placement.
120 The entry_names are used to do simple name mangling on the stubs.
121 Given a function name, and its type, the stub can be found. The
122 name can be changed. The only requirement is the %s be present. */
124 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
125 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
127 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
128 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
130 /* Used by the assembler. */
132 static bfd_reloc_status_type
133 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
136 arelent *reloc_entry;
137 asymbol *symbol ATTRIBUTE_UNUSED;
139 asection *input_section ATTRIBUTE_UNUSED;
141 char **error_message ATTRIBUTE_UNUSED;
144 if (output_bfd == (bfd *) NULL)
145 return bfd_reloc_continue;
147 diff = reloc_entry->addend;
150 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
154 reloc_howto_type *howto = reloc_entry->howto;
155 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
161 char x = bfd_get_8 (abfd, addr);
163 bfd_put_8 (abfd, x, addr);
169 short x = bfd_get_16 (abfd, addr);
171 bfd_put_16 (abfd, x, addr);
177 long x = bfd_get_32 (abfd, addr);
179 bfd_put_32 (abfd, x, addr);
188 /* Now let bfd_perform_relocation finish everything up. */
189 return bfd_reloc_continue;
192 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
193 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
195 #ifndef TARGET_UNDERSCORE
196 #define TARGET_UNDERSCORE '_'
200 #define PCRELOFFSET true
203 /* These most certainly belong somewhere else. Just had to get rid of
204 the manifest constants in the code. */
217 #define ARM_THUMB9 12
218 #define ARM_THUMB12 13
219 #define ARM_THUMB23 14
231 #define ARM_THUMB12 4
233 #define ARM_SECTION 14
234 #define ARM_SECREL 15
237 static reloc_howto_type aoutarm_std_reloc_howto[] =
247 complain_overflow_bitfield,
260 complain_overflow_bitfield,
273 complain_overflow_signed,
274 aoutarm_fix_pcrel_26 ,
286 complain_overflow_signed,
287 coff_thumb_pcrel_12 ,
299 complain_overflow_dont,
300 aoutarm_fix_pcrel_26_done,
320 complain_overflow_bitfield,
333 complain_overflow_bitfield,
340 #else /* not ARM_WINCE */
341 HOWTO (ARM_8, /* type */
345 false, /* pc_relative */
347 complain_overflow_bitfield, /* complain_on_overflow */
348 coff_arm_reloc, /* special_function */
350 true, /* partial_inplace */
351 0x000000ff, /* src_mask */
352 0x000000ff, /* dst_mask */
353 PCRELOFFSET /* pcrel_offset */),
360 complain_overflow_bitfield,
373 complain_overflow_bitfield,
386 complain_overflow_signed,
387 aoutarm_fix_pcrel_26 ,
399 complain_overflow_signed,
412 complain_overflow_signed,
425 complain_overflow_signed,
438 complain_overflow_dont,
439 aoutarm_fix_pcrel_26_done,
453 complain_overflow_bitfield,
466 complain_overflow_bitfield,
479 complain_overflow_bitfield,
492 complain_overflow_signed,
505 complain_overflow_signed,
506 coff_thumb_pcrel_12 ,
518 complain_overflow_signed,
519 coff_thumb_pcrel_23 ,
525 #endif /* not ARM_WINCE */
528 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
531 static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
532 /* Return true if this relocation should
533 appear in the output .reloc section. */
536 in_reloc_p (abfd, howto)
537 bfd * abfd ATTRIBUTE_UNUSED;
538 reloc_howto_type * howto;
540 return !howto->pc_relative && howto->type != ARM_RVA32;
544 #define RTYPE2HOWTO(cache_ptr, dst) \
545 (cache_ptr)->howto = \
546 (dst)->r_type < NUM_RELOCS \
547 ? aoutarm_std_reloc_howto + (dst)->r_type \
550 #define coff_rtype_to_howto coff_arm_rtype_to_howto
552 static reloc_howto_type *
553 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
554 bfd *abfd ATTRIBUTE_UNUSED;
556 struct internal_reloc *rel;
557 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
558 struct internal_syment *sym ATTRIBUTE_UNUSED;
561 reloc_howto_type * howto;
563 if (rel->r_type >= NUM_RELOCS)
566 howto = aoutarm_std_reloc_howto + rel->r_type;
568 if (rel->r_type == ARM_RVA32)
569 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
574 /* Used by the assembler. */
576 static bfd_reloc_status_type
577 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
578 output_bfd, error_message)
579 bfd *abfd ATTRIBUTE_UNUSED;
580 arelent *reloc_entry ATTRIBUTE_UNUSED;
581 asymbol *symbol ATTRIBUTE_UNUSED;
582 PTR data ATTRIBUTE_UNUSED;
583 asection *input_section ATTRIBUTE_UNUSED;
584 bfd *output_bfd ATTRIBUTE_UNUSED;
585 char **error_message ATTRIBUTE_UNUSED;
587 /* This is dead simple at present. */
591 /* Used by the assembler. */
593 static bfd_reloc_status_type
594 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
595 output_bfd, error_message)
597 arelent *reloc_entry;
600 asection *input_section;
602 char **error_message ATTRIBUTE_UNUSED;
605 bfd_size_type addr = reloc_entry->address;
606 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
607 bfd_reloc_status_type flag = bfd_reloc_ok;
609 /* If this is an undefined symbol, return error. */
610 if (symbol->section == &bfd_und_section
611 && (symbol->flags & BSF_WEAK) == 0)
612 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
614 /* If the sections are different, and we are doing a partial relocation,
615 just ignore it for now. */
616 if (symbol->section->name != input_section->name
617 && output_bfd != (bfd *)NULL)
618 return bfd_reloc_continue;
620 relocation = (target & 0x00ffffff) << 2;
621 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
622 relocation += symbol->value;
623 relocation += symbol->section->output_section->vma;
624 relocation += symbol->section->output_offset;
625 relocation += reloc_entry->addend;
626 relocation -= input_section->output_section->vma;
627 relocation -= input_section->output_offset;
631 return bfd_reloc_overflow;
633 /* Check for overflow. */
634 if (relocation & 0x02000000)
636 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
637 flag = bfd_reloc_overflow;
639 else if (relocation & ~0x03ffffff)
640 flag = bfd_reloc_overflow;
642 target &= ~0x00ffffff;
643 target |= (relocation >> 2) & 0x00ffffff;
644 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
646 /* Now the ARM magic... Change the reloc type so that it is marked as done.
647 Strictly this is only necessary if we are doing a partial relocation. */
648 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
653 static bfd_reloc_status_type
654 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
655 output_bfd, error_message, btype)
657 arelent *reloc_entry;
660 asection *input_section;
662 char **error_message ATTRIBUTE_UNUSED;
663 thumb_pcrel_branchtype btype;
665 bfd_vma relocation = 0;
666 bfd_size_type addr = reloc_entry->address;
667 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
668 bfd_reloc_status_type flag = bfd_reloc_ok;
673 /* NOTE: This routine is currently used by GAS, but not by the link
681 signbit = 0x00000100;
687 signbit = 0x00000800;
693 signbit = 0x00400000;
700 /* If this is an undefined symbol, return error. */
701 if (symbol->section == &bfd_und_section
702 && (symbol->flags & BSF_WEAK) == 0)
703 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
705 /* If the sections are different, and we are doing a partial relocation,
706 just ignore it for now. */
707 if (symbol->section->name != input_section->name
708 && output_bfd != (bfd *)NULL)
709 return bfd_reloc_continue;
715 relocation = ((target & dstmsk) << 1);
719 if (bfd_big_endian (abfd))
720 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
722 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
729 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
730 relocation += symbol->value;
731 relocation += symbol->section->output_section->vma;
732 relocation += symbol->section->output_offset;
733 relocation += reloc_entry->addend;
734 relocation -= input_section->output_section->vma;
735 relocation -= input_section->output_offset;
739 return bfd_reloc_overflow;
741 /* Check for overflow. */
742 if (relocation & signbit)
744 if ((relocation & ~offmsk) != ~offmsk)
745 flag = bfd_reloc_overflow;
747 else if (relocation & ~offmsk)
748 flag = bfd_reloc_overflow;
755 target |= (relocation >> 1);
759 if (bfd_big_endian (abfd))
760 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
762 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
769 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
771 /* Now the ARM magic... Change the reloc type so that it is marked as done.
772 Strictly this is only necessary if we are doing a partial relocation. */
773 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
775 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
779 static bfd_reloc_status_type
780 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
781 output_bfd, error_message)
783 arelent *reloc_entry;
786 asection *input_section;
788 char **error_message;
790 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
791 input_section, output_bfd, error_message, b23);
794 static bfd_reloc_status_type
795 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
796 output_bfd, error_message)
798 arelent *reloc_entry;
801 asection *input_section;
803 char **error_message;
805 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
806 input_section, output_bfd, error_message, b12);
809 static bfd_reloc_status_type
810 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
811 output_bfd, error_message)
813 arelent *reloc_entry;
816 asection *input_section;
818 char **error_message;
820 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821 input_section, output_bfd, error_message, b9);
824 static CONST struct reloc_howto_struct *
825 coff_arm_reloc_type_lookup (abfd, code)
827 bfd_reloc_code_real_type code;
829 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
831 if (code == BFD_RELOC_CTOR)
832 switch (bfd_get_arch_info (abfd)->bits_per_address)
838 return (CONST struct reloc_howto_struct *) 0;
844 ASTD (BFD_RELOC_32, ARM_32);
845 ASTD (BFD_RELOC_RVA, ARM_RVA32);
846 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
847 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
849 ASTD (BFD_RELOC_8, ARM_8);
850 ASTD (BFD_RELOC_16, ARM_16);
851 ASTD (BFD_RELOC_32, ARM_32);
852 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
853 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
854 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
855 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
856 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
857 ASTD (BFD_RELOC_RVA, ARM_RVA32);
858 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
859 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
860 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
861 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
863 default: return (CONST struct reloc_howto_struct *) 0;
867 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
868 #define COFF_PAGE_SIZE 0x1000
869 /* Turn a howto into a reloc nunmber */
871 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
872 #define BADMAG(x) ARMBADMAG(x)
873 #define ARM 1 /* Customize coffcode.h */
875 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
876 This allows us to store global data here without actually creating any
877 global variables, which is a no-no in the BFD world. */
878 struct coff_arm_link_hash_table
880 /* The original coff_link_hash_table structure. MUST be first field. */
881 struct coff_link_hash_table root;
883 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
884 long int thumb_glue_size;
886 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
887 long int arm_glue_size;
889 /* An arbitary input BFD chosen to hold the glue sections. */
890 bfd * bfd_of_glue_owner;
892 /* Support interworking with old, non-interworking aware ARM code. */
893 int support_old_code;
896 /* Get the ARM coff linker hash table from a link_info structure. */
897 #define coff_arm_hash_table(info) \
898 ((struct coff_arm_link_hash_table *) ((info)->hash))
900 /* Create an ARM coff linker hash table. */
902 static struct bfd_link_hash_table *
903 coff_arm_link_hash_table_create (abfd)
906 struct coff_arm_link_hash_table * ret;
908 ret = ((struct coff_arm_link_hash_table *)
909 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
910 if (ret == (struct coff_arm_link_hash_table *) NULL)
913 if (! _bfd_coff_link_hash_table_init
914 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
916 bfd_release (abfd, ret);
917 return (struct bfd_link_hash_table *) NULL;
920 ret->thumb_glue_size = 0;
921 ret->arm_glue_size = 0;
922 ret->bfd_of_glue_owner = NULL;
924 return & ret->root.root;
928 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
929 struct bfd_link_info *info;
931 asection *input_section;
932 bfd_vma reloc_offset;
934 bfd_vma addr = reloc_offset
936 + input_section->output_offset
937 + input_section->output_section->vma;
939 if (coff_data (output_bfd)->pe)
940 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
941 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
945 /* The thumb form of a long branch is a bit finicky, because the offset
946 encoding is split over two fields, each in it's own instruction. They
947 can occur in any order. So given a thumb form of long branch, and an
948 offset, insert the offset into the thumb branch and return finished
951 It takes two thumb instructions to encode the target address. Each has
952 11 bits to invest. The upper 11 bits are stored in one (identifed by
953 H-0.. see below), the lower 11 bits are stored in the other (identified
956 Combine together and shifted left by 1 (it's a half word address) and
960 H-0, upper address-0 = 000
962 H-1, lower address-0 = 800
964 They can be ordered either way, but the arm tools I've seen always put
965 the lower one first. It probably doesn't matter. krk@cygnus.com
967 XXX: Actually the order does matter. The second instruction (H-1)
968 moves the computed address into the PC, so it must be the second one
969 in the sequence. The problem, however is that whilst little endian code
970 stores the instructions in HI then LOW order, big endian code does the
971 reverse. nickc@cygnus.com. */
973 #define LOW_HI_ORDER 0xF800F000
974 #define HI_LOW_ORDER 0xF000F800
977 insert_thumb_branch (br_insn, rel_off)
981 unsigned int low_bits;
982 unsigned int high_bits;
984 BFD_ASSERT((rel_off & 1) != 1);
986 rel_off >>= 1; /* half word aligned address */
987 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
988 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
990 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
991 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
992 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
993 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
995 /* FIXME: the BFD library should never abort - it should return an error status. */
996 abort (); /* Error - not a valid branch instruction form. */
1001 static struct coff_link_hash_entry *
1002 find_thumb_glue (info, name, input_bfd)
1003 struct bfd_link_info * info;
1008 struct coff_link_hash_entry * myh;
1010 tmp_name = ((char *)
1011 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1013 BFD_ASSERT (tmp_name);
1015 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1017 myh = coff_link_hash_lookup
1018 (coff_hash_table (info), tmp_name, false, false, true);
1021 /* xgettext:c-format */
1022 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1023 bfd_get_filename (input_bfd), tmp_name, name);
1030 static struct coff_link_hash_entry *
1031 find_arm_glue (info, name, input_bfd)
1032 struct bfd_link_info * info;
1037 struct coff_link_hash_entry * myh;
1039 tmp_name = ((char *)
1040 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1042 BFD_ASSERT (tmp_name);
1044 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1046 myh = coff_link_hash_lookup
1047 (coff_hash_table (info), tmp_name, false, false, true);
1050 /* xgettext:c-format */
1051 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1052 bfd_get_filename (input_bfd), tmp_name, name);
1064 ldr r12, __func_addr
1067 .word func @ behave as if you saw a ARM_32 reloc
1070 #define ARM2THUMB_GLUE_SIZE 12
1071 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1072 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1073 static const insn32 a2t3_func_addr_insn = 0x00000001;
1076 Thumb->ARM: Thumb->(non-interworking aware) ARM
1080 __func_from_thumb: __func_from_thumb:
1082 nop ldr r6, __func_addr
1084 __func_change_to_arm: bx r6
1086 __func_back_to_thumb:
1093 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1094 static const insn16 t2a1_bx_pc_insn = 0x4778;
1095 static const insn16 t2a2_noop_insn = 0x46c0;
1096 static const insn32 t2a3_b_insn = 0xea000000;
1098 static const insn16 t2a1_push_insn = 0xb540;
1099 static const insn16 t2a2_ldr_insn = 0x4e03;
1100 static const insn16 t2a3_mov_insn = 0x46fe;
1101 static const insn16 t2a4_bx_insn = 0x4730;
1102 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1103 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1106 We should really create new local (static) symbols in destination
1107 object for each stub we create. We should also create local
1108 (static) symbols within the stubs when switching between ARM and
1109 Thumb code. This will ensure that the debugger and disassembler
1110 can present a better view of stubs.
1112 We can treat stubs like literal sections, and for the THUMB9 ones
1113 (short addressing range) we should be able to insert the stubs
1114 between sections. i.e. the simplest approach (since relocations
1115 are done on a section basis) is to dump the stubs at the end of
1116 processing a section. That way we can always try and minimise the
1117 offset to and from a stub. However, this does not map well onto
1118 the way that the linker/BFD does its work: mapping all input
1119 sections to output sections via the linker script before doing
1122 Unfortunately it may be easier to just to disallow short range
1123 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1124 only branch-and-link (BL) calls. This will simplify the processing
1125 since we can then put all of the stubs into their own section.
1128 On a different subject, rather than complaining when a
1129 branch cannot fit in the number of bits available for the
1130 instruction we should generate a trampoline stub (needed to
1131 address the complete 32bit address space). */
1133 /* The standard COFF backend linker does not cope with the special
1134 Thumb BRANCH23 relocation. The alternative would be to split the
1135 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1136 bit simpler simply providing our own relocation driver. */
1138 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1139 This code is a very slightly modified copy of
1140 _bfd_coff_generic_relocate_section. It would be a much more
1141 maintainable solution to have a MACRO that could be expanded within
1142 _bfd_coff_generic_relocate_section that would only be provided for
1143 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1144 is different from the original. */
1147 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1148 contents, relocs, syms, sections)
1150 struct bfd_link_info *info;
1152 asection *input_section;
1154 struct internal_reloc *relocs;
1155 struct internal_syment *syms;
1156 asection **sections;
1158 struct internal_reloc * rel;
1159 struct internal_reloc * relend;
1162 relend = rel + input_section->reloc_count;
1164 for (; rel < relend; rel++)
1168 struct coff_link_hash_entry * h;
1169 struct internal_syment * sym;
1172 reloc_howto_type * howto;
1173 bfd_reloc_status_type rstat;
1176 symndx = rel->r_symndx;
1185 h = obj_coff_sym_hashes (input_bfd)[symndx];
1186 sym = syms + symndx;
1189 /* COFF treats common symbols in one of two ways. Either the
1190 size of the symbol is included in the section contents, or it
1191 is not. We assume that the size is not included, and force
1192 the rtype_to_howto function to adjust the addend as needed. */
1194 if (sym != NULL && sym->n_scnum != 0)
1195 addend = - sym->n_value;
1199 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1204 /* The relocation_section function will skip pcrel_offset relocs
1205 when doing a relocateable link. However, we want to convert
1206 ARM26 to ARM26D relocs if possible. We return a fake howto in
1207 this case without pcrel_offset set, and adjust the addend to
1209 if (rel->r_type == ARM_26
1211 && info->relocateable
1212 && (h->root.type == bfd_link_hash_defined
1213 || h->root.type == bfd_link_hash_defweak)
1214 && h->root.u.def.section->output_section == input_section->output_section)
1216 static reloc_howto_type fake_arm26_reloc =
1223 complain_overflow_signed,
1224 aoutarm_fix_pcrel_26 ,
1231 addend -= rel->r_vaddr - input_section->vma;
1232 howto = &fake_arm26_reloc;
1236 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1237 the next opcode's pc, so is off by one. */
1238 if (howto->pc_relative && !info->relocateable)
1242 /* If we are doing a relocateable link, then we can just ignore
1243 a PC relative reloc that is pcrel_offset. It will already
1244 have the correct value. If this is not a relocateable link,
1245 then we should ignore the symbol value. */
1246 if (howto->pc_relative && howto->pcrel_offset)
1248 if (info->relocateable)
1250 /* FIXME - it is not clear which targets need this next test
1251 and which do not. It is known that it is needed for the
1252 VxWorks and EPOC-PE targets, but it is also known that it
1253 was supressed for other ARM targets. This ought to be
1254 sorted out one day. */
1255 #ifdef ARM_COFF_BUGFIX
1256 /* We must not ignore the symbol value. If the symbol is
1257 within the same section, the relocation should have already
1258 been fixed, but if it is not, we'll be handed a reloc into
1259 the beginning of the symbol's section, so we must not cancel
1260 out the symbol's value, otherwise we'll be adding it in
1262 if (sym != NULL && sym->n_scnum != 0)
1263 addend += sym->n_value;
1275 sec = bfd_abs_section_ptr;
1280 sec = sections[symndx];
1281 val = (sec->output_section->vma
1282 + sec->output_offset
1289 #if 1 /* THUMBEXTENSION */
1290 /* We don't output the stubs if we are generating a
1291 relocatable output file, since we may as well leave the
1292 stub generation to the final linker pass. If we fail to
1293 verify that the name is defined, we'll try to build stubs
1294 for an undefined name... */
1295 if (! info->relocateable
1296 && ( h->root.type == bfd_link_hash_defined
1297 || h->root.type == bfd_link_hash_defweak))
1299 asection * h_sec = h->root.u.def.section;
1300 const char * name = h->root.root.string;
1302 /* h locates the symbol referenced in the reloc. */
1303 h_val = (h->root.u.def.value
1304 + h_sec->output_section->vma
1305 + h_sec->output_offset);
1307 if (howto->type == ARM_26)
1309 if ( h->class == C_THUMBSTATFUNC
1310 || h->class == C_THUMBEXTFUNC)
1312 /* Arm code calling a Thumb function. */
1313 unsigned long int tmp;
1316 long int ret_offset;
1317 struct coff_link_hash_entry * myh;
1318 struct coff_arm_link_hash_table * globals;
1320 myh = find_arm_glue (info, name, input_bfd);
1324 globals = coff_arm_hash_table (info);
1326 BFD_ASSERT (globals != NULL);
1327 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1329 my_offset = myh->root.u.def.value;
1331 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1332 ARM2THUMB_GLUE_SECTION_NAME);
1333 BFD_ASSERT (s != NULL);
1334 BFD_ASSERT (s->contents != NULL);
1335 BFD_ASSERT (s->output_section != NULL);
1337 if ((my_offset & 0x01) == 0x01)
1339 if (h_sec->owner != NULL
1340 && INTERWORK_SET (h_sec->owner)
1341 && ! INTERWORK_FLAG (h_sec->owner))
1344 /* xgettext:c-format */
1345 (_("%s(%s): warning: interworking not enabled."),
1346 bfd_get_filename (h_sec->owner), name);
1348 /* xgettext:c-format */
1349 (_(" first occurrence: %s: arm call to thumb"),
1350 bfd_get_filename (input_bfd));
1354 myh->root.u.def.value = my_offset;
1356 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1357 s->contents + my_offset);
1359 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1360 s->contents + my_offset + 4);
1362 /* It's a thumb address. Add the low order bit. */
1363 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1364 s->contents + my_offset + 8);
1366 if (info->base_file)
1367 arm_emit_base_file_entry (info, output_bfd, s,
1372 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1374 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1375 - input_section->vma);
1377 tmp = tmp & 0xFF000000;
1379 /* Somehow these are both 4 too far, so subtract 8. */
1383 + s->output_section->vma
1384 - (input_section->output_offset
1385 + input_section->output_section->vma
1389 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1391 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1392 - input_section->vma);
1398 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1399 else if (howto->type == ARM_THUMB23)
1401 if ( h->class == C_EXT
1402 || h->class == C_STAT
1403 || h->class == C_LABEL)
1405 /* Thumb code calling an ARM function */
1408 unsigned long int tmp;
1409 long int ret_offset;
1410 struct coff_link_hash_entry * myh;
1411 struct coff_arm_link_hash_table * globals;
1413 myh = find_thumb_glue (info, name, input_bfd);
1417 globals = coff_arm_hash_table (info);
1419 BFD_ASSERT (globals != NULL);
1420 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1422 my_offset = myh->root.u.def.value;
1424 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1425 THUMB2ARM_GLUE_SECTION_NAME);
1427 BFD_ASSERT (s != NULL);
1428 BFD_ASSERT (s->contents != NULL);
1429 BFD_ASSERT (s->output_section != NULL);
1431 if ((my_offset & 0x01) == 0x01)
1433 if (h_sec->owner != NULL
1434 && INTERWORK_SET (h_sec->owner)
1435 && ! INTERWORK_FLAG (h_sec->owner)
1436 && ! globals->support_old_code)
1439 /* xgettext:c-format */
1440 (_("%s(%s): warning: interworking not enabled."),
1441 bfd_get_filename (h_sec->owner), name);
1443 /* xgettext:c-format */
1444 (_(" first occurrence: %s: thumb call to arm"),
1445 bfd_get_filename (input_bfd));
1447 (_(" consider relinking with --support-old-code enabled"));
1451 myh->root.u.def.value = my_offset;
1453 if (globals->support_old_code)
1455 bfd_put_16 (output_bfd, t2a1_push_insn,
1456 s->contents + my_offset);
1458 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1459 s->contents + my_offset + 2);
1461 bfd_put_16 (output_bfd, t2a3_mov_insn,
1462 s->contents + my_offset + 4);
1464 bfd_put_16 (output_bfd, t2a4_bx_insn,
1465 s->contents + my_offset + 6);
1467 bfd_put_32 (output_bfd, t2a5_pop_insn,
1468 s->contents + my_offset + 8);
1470 bfd_put_32 (output_bfd, t2a6_bx_insn,
1471 s->contents + my_offset + 12);
1473 /* Store the address of the function in the last word of the stub. */
1474 bfd_put_32 (output_bfd, h_val,
1475 s->contents + my_offset + 16);
1477 if (info->base_file)
1478 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1482 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1483 s->contents + my_offset);
1485 bfd_put_16 (output_bfd, t2a2_noop_insn,
1486 s->contents + my_offset + 2);
1489 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1491 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1492 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1493 + s->output_section->vma) /* Address of the start of the current section. */
1494 + 4 /* The branch instruction is 4 bytes into the stub. */
1495 + 8); /* ARM branches work from the pc of the instruction + 8. */
1497 bfd_put_32 (output_bfd,
1498 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1499 s->contents + my_offset + 4);
1504 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1506 /* Now go back and fix up the original BL insn to point
1511 - (input_section->output_offset
1515 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1516 - input_section->vma);
1518 bfd_put_32 (output_bfd,
1519 insert_thumb_branch (tmp, ret_offset),
1520 contents + rel->r_vaddr
1521 - input_section->vma);
1529 /* If the relocation type and destination symbol does not
1530 fall into one of the above categories, then we can just
1531 perform a direct link. */
1534 rstat = bfd_reloc_ok;
1536 #endif /* THUMBEXTENSION */
1537 if ( h->root.type == bfd_link_hash_defined
1538 || h->root.type == bfd_link_hash_defweak)
1542 sec = h->root.u.def.section;
1543 val = (h->root.u.def.value
1544 + sec->output_section->vma
1545 + sec->output_offset);
1548 else if (! info->relocateable)
1550 if (! ((*info->callbacks->undefined_symbol)
1551 (info, h->root.root.string, input_bfd, input_section,
1552 rel->r_vaddr - input_section->vma, true)))
1557 if (info->base_file)
1559 /* Emit a reloc if the backend thinks it needs it. */
1560 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1561 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1564 #if 1 /* THUMBEXTENSION */
1566 rstat = bfd_reloc_ok;
1568 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1569 else if (! info->relocateable
1570 && howto->type == ARM_THUMB23)
1572 /* This is pretty much a copy of what the default
1573 _bfd_final_link_relocate and _bfd_relocate_contents
1574 routines do to perform a relocation, with special
1575 processing for the split addressing of the Thumb BL
1576 instruction. Again, it would probably be simpler adding a
1577 ThumbBRANCH23 specific macro expansion into the default
1580 bfd_vma address = rel->r_vaddr - input_section->vma;
1582 if (address > input_section->_raw_size)
1583 rstat = bfd_reloc_outofrange;
1586 bfd_vma relocation = val + addend;
1587 int size = bfd_get_reloc_size (howto);
1588 boolean overflow = false;
1589 bfd_byte * location = contents + address;
1590 bfd_vma x = bfd_get_32 (input_bfd, location);
1591 bfd_vma src_mask = 0x007FFFFE;
1592 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1593 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1595 bfd_signed_vma signed_check;
1597 bfd_signed_vma signed_add;
1599 BFD_ASSERT (size == 4);
1601 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1602 relocation -= (input_section->output_section->vma
1603 + input_section->output_offset);
1605 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1606 relocation -= address;
1608 /* No need to negate the relocation with BRANCH23. */
1609 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1610 /* howto->rightshift == 1 */
1612 /* Drop unwanted bits from the value we are relocating to. */
1613 check = relocation >> howto->rightshift;
1615 /* If this is a signed value, the rightshift just dropped
1616 leading 1 bits (assuming twos complement). */
1617 if ((bfd_signed_vma) relocation >= 0)
1618 signed_check = check;
1620 signed_check = (check
1622 & ~((bfd_vma) - 1 >> howto->rightshift)));
1624 /* Get the value from the object file. */
1625 if (bfd_big_endian (input_bfd))
1626 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1628 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1630 /* Get the value from the object file with an appropriate sign.
1631 The expression involving howto->src_mask isolates the upper
1632 bit of src_mask. If that bit is set in the value we are
1633 adding, it is negative, and we subtract out that number times
1634 two. If src_mask includes the highest possible bit, then we
1635 can not get the upper bit, but that does not matter since
1636 signed_add needs no adjustment to become negative in that
1640 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1641 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1643 /* howto->bitpos == 0 */
1644 /* Add the value from the object file, shifted so that it is a
1646 signed_check += signed_add;
1647 relocation += signed_add;
1649 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1651 /* Assumes two's complement. */
1652 if ( signed_check > reloc_signed_max
1653 || signed_check < reloc_signed_min)
1656 /* For the BLX(1) instruction remove bit 0 of the adjusted offset.
1657 Bit 0 can only be set if the upper insn is at a half-word boundary,
1658 since the destination address, an ARM instruction, must always be
1659 on a word boundary. The semantics of the BLX (1) instruction,
1660 however, are that bit 0 in the offset must always be 0, and the
1661 corresponding bit 1 in the target address will be set from bit
1662 1 of the source address. */
1663 if ((x & 0x18000000) == 0x08000000)
1666 /* Put the relocation into the correct bits. */
1667 if (bfd_big_endian (input_bfd))
1668 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1670 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1672 /* Add the relocation to the correct bits of X. */
1673 x = ((x & ~howto->dst_mask) | relocation);
1675 /* Put the relocated value back in the object file. */
1676 bfd_put_32 (input_bfd, x, location);
1678 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1683 #endif /* THUMBEXTENSION */
1684 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1686 rel->r_vaddr - input_section->vma,
1688 #if 1 /* THUMBEXTENSION */
1690 Is this the best way to fix up thumb addresses? krk@cygnus.com
1691 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1692 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1693 if (! info->relocateable
1694 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1696 /* Determine if we need to set the bottom bit of a relocated address
1697 because the address is the address of a Thumb code symbol. */
1699 int patchit = false;
1702 && ( h->class == C_THUMBSTATFUNC
1703 || h->class == C_THUMBEXTFUNC))
1707 else if (sym != NULL
1708 && sym->n_scnum > N_UNDEF)
1710 /* No hash entry - use the symbol instead. */
1712 if ( sym->n_sclass == C_THUMBSTATFUNC
1713 || sym->n_sclass == C_THUMBEXTFUNC)
1719 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1720 bfd_vma x = bfd_get_32 (input_bfd, location);
1722 bfd_put_32 (input_bfd, x | 1, location);
1725 #endif /* THUMBEXTENSION */
1733 case bfd_reloc_outofrange:
1734 (*_bfd_error_handler)
1735 (_("%s: bad reloc address 0x%lx in section `%s'"),
1736 bfd_get_filename (input_bfd),
1737 (unsigned long) rel->r_vaddr,
1738 bfd_get_section_name (input_bfd, input_section));
1740 case bfd_reloc_overflow:
1743 char buf[SYMNMLEN + 1];
1748 name = h->root.root.string;
1751 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1756 if (! ((*info->callbacks->reloc_overflow)
1757 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1758 input_section, rel->r_vaddr - input_section->vma)))
1767 #ifndef COFF_IMAGE_WITH_PE
1770 bfd_arm_allocate_interworking_sections (info)
1771 struct bfd_link_info * info;
1775 struct coff_arm_link_hash_table * globals;
1777 static char test_char = '1';
1780 globals = coff_arm_hash_table (info);
1782 BFD_ASSERT (globals != NULL);
1784 if (globals->arm_glue_size != 0)
1786 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1788 s = bfd_get_section_by_name
1789 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1791 BFD_ASSERT (s != NULL);
1793 foo = (bfd_byte *) bfd_alloc
1794 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1796 memset (foo, test_char, globals->arm_glue_size);
1799 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1803 if (globals->thumb_glue_size != 0)
1805 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1807 s = bfd_get_section_by_name
1808 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1810 BFD_ASSERT (s != NULL);
1812 foo = (bfd_byte *) bfd_alloc
1813 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1815 memset (foo, test_char, globals->thumb_glue_size);
1818 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1826 record_arm_to_thumb_glue (info, h)
1827 struct bfd_link_info * info;
1828 struct coff_link_hash_entry * h;
1830 const char * name = h->root.root.string;
1831 register asection * s;
1833 struct coff_link_hash_entry * myh;
1834 struct coff_arm_link_hash_table * globals;
1836 globals = coff_arm_hash_table (info);
1838 BFD_ASSERT (globals != NULL);
1839 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1841 s = bfd_get_section_by_name
1842 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1844 BFD_ASSERT (s != NULL);
1846 tmp_name = ((char *)
1847 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1849 BFD_ASSERT (tmp_name);
1851 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1853 myh = coff_link_hash_lookup
1854 (coff_hash_table (info), tmp_name, false, false, true);
1859 return; /* we've already seen this guy */
1862 /* The only trick here is using globals->arm_glue_size as the value. Even
1863 though the section isn't allocated yet, this is where we will be putting
1866 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1868 s, globals->arm_glue_size + 1,
1870 (struct bfd_link_hash_entry **) & myh);
1874 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1880 record_thumb_to_arm_glue (info, h)
1881 struct bfd_link_info * info;
1882 struct coff_link_hash_entry * h;
1884 const char * name = h->root.root.string;
1885 register asection * s;
1887 struct coff_link_hash_entry * myh;
1888 struct coff_arm_link_hash_table * globals;
1890 globals = coff_arm_hash_table (info);
1892 BFD_ASSERT (globals != NULL);
1893 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1895 s = bfd_get_section_by_name
1896 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1898 BFD_ASSERT (s != NULL);
1900 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1902 BFD_ASSERT (tmp_name);
1904 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1906 myh = coff_link_hash_lookup
1907 (coff_hash_table (info), tmp_name, false, false, true);
1912 return; /* we've already seen this guy */
1915 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1916 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1918 (struct bfd_link_hash_entry **) & myh);
1920 /* If we mark it 'thumb', the disassembler will do a better job. */
1921 myh->class = C_THUMBEXTFUNC;
1925 /* Allocate another symbol to mark where we switch to arm mode. */
1927 #define CHANGE_TO_ARM "__%s_change_to_arm"
1928 #define BACK_FROM_ARM "__%s_back_from_arm"
1930 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1932 BFD_ASSERT (tmp_name);
1934 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1938 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1939 BSF_LOCAL, s, globals->thumb_glue_size
1940 + (globals->support_old_code ? 8 : 4),
1942 (struct bfd_link_hash_entry **) & myh);
1946 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1951 /* Select a BFD to be used to hold the sections used by the glue code.
1952 This function is called from the linker scripts in ld/emultempl/
1956 bfd_arm_get_bfd_for_interworking (abfd, info)
1958 struct bfd_link_info * info;
1960 struct coff_arm_link_hash_table * globals;
1964 /* If we are only performing a partial link do not bother
1965 getting a bfd to hold the glue. */
1966 if (info->relocateable)
1969 globals = coff_arm_hash_table (info);
1971 BFD_ASSERT (globals != NULL);
1973 if (globals->bfd_of_glue_owner != NULL)
1976 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1980 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1982 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1985 || ! bfd_set_section_flags (abfd, sec, flags)
1986 || ! bfd_set_section_alignment (abfd, sec, 2))
1990 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1994 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1996 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1999 || ! bfd_set_section_flags (abfd, sec, flags)
2000 || ! bfd_set_section_alignment (abfd, sec, 2))
2004 /* Save the bfd for later use. */
2005 globals->bfd_of_glue_owner = abfd;
2011 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2013 struct bfd_link_info * info;
2014 int support_old_code;
2017 struct coff_arm_link_hash_table * globals;
2019 /* If we are only performing a partial link do not bother
2020 to construct any glue. */
2021 if (info->relocateable)
2024 /* Here we have a bfd that is to be included on the link. We have a hook
2025 to do reloc rummaging, before section sizes are nailed down. */
2027 _bfd_coff_get_external_symbols (abfd);
2029 globals = coff_arm_hash_table (info);
2031 BFD_ASSERT (globals != NULL);
2032 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2034 globals->support_old_code = support_old_code;
2036 /* Rummage around all the relocs and map the glue vectors. */
2037 sec = abfd->sections;
2042 for (; sec != NULL; sec = sec->next)
2044 struct internal_reloc * i;
2045 struct internal_reloc * rel;
2047 if (sec->reloc_count == 0)
2050 /* Load the relocs. */
2051 /* FIXME: there may be a storage leak here. */
2053 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2055 BFD_ASSERT (i != 0);
2057 for (rel = i; rel < i + sec->reloc_count; ++rel)
2059 unsigned short r_type = rel->r_type;
2061 struct coff_link_hash_entry * h;
2063 symndx = rel->r_symndx;
2065 /* If the relocation is not against a symbol it cannot concern us. */
2069 /* If the index is outside of the range of our table, something has gone wrong. */
2070 if (symndx >= obj_conv_table_size (abfd))
2072 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2073 bfd_get_filename (abfd), symndx);
2077 h = obj_coff_sym_hashes (abfd)[symndx];
2079 /* If the relocation is against a static symbol it must be within
2080 the current section and so cannot be a cross ARM/Thumb relocation. */
2087 /* This one is a call from arm code. We need to look up
2088 the target of the call. If it is a thumb target, we
2091 if (h->class == C_THUMBEXTFUNC)
2092 record_arm_to_thumb_glue (info, h);
2097 /* This one is a call from thumb code. We used to look
2098 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2099 up the target of the call. If it is an arm target, we
2100 insert glue. If the symbol does not exist it will be
2101 given a class of C_EXT and so we will generate a stub
2102 for it. This is not really a problem, since the link
2103 is doomed anyway. */
2110 record_thumb_to_arm_glue (info, h);
2127 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2129 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2130 #define coff_relocate_section coff_arm_relocate_section
2131 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2132 #define coff_adjust_symndx coff_arm_adjust_symndx
2133 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2134 #define coff_final_link_postscript coff_arm_final_link_postscript
2135 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2136 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2137 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2138 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2139 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2141 /* When doing a relocateable link, we want to convert ARM26 relocs
2142 into ARM26D relocs. */
2145 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2146 bfd *obfd ATTRIBUTE_UNUSED;
2147 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2150 struct internal_reloc *irel;
2153 if (irel->r_type == 3)
2155 struct coff_link_hash_entry *h;
2157 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2159 && (h->root.type == bfd_link_hash_defined
2160 || h->root.type == bfd_link_hash_defweak)
2161 && h->root.u.def.section->output_section == sec->output_section)
2168 /* Called when merging the private data areas of two BFDs.
2169 This is important as it allows us to detect if we are
2170 attempting to merge binaries compiled for different ARM
2171 targets, eg different CPUs or differents APCS's. */
2174 coff_arm_merge_private_bfd_data (ibfd, obfd)
2178 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2183 /* If the two formats are different we cannot merge anything.
2184 This is not an error, since it is permissable to change the
2185 input and output formats. */
2186 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2187 || obfd->xvec->flavour != bfd_target_coff_flavour)
2190 /* Verify that the APCS is the same for the two BFDs */
2191 if (APCS_SET (ibfd))
2193 if (APCS_SET (obfd))
2195 /* If the src and dest have different APCS flag bits set, fail. */
2196 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2199 /* xgettext: c-format */
2200 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2201 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2202 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2205 bfd_set_error (bfd_error_wrong_format);
2209 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2213 if (APCS_FLOAT_FLAG (ibfd))
2214 /* xgettext: c-format */
2215 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2217 /* xgettext: c-format */
2218 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2220 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2221 bfd_get_filename (obfd));
2223 bfd_set_error (bfd_error_wrong_format);
2227 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2231 if (PIC_FLAG (ibfd))
2232 /* xgettext: c-format */
2233 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2235 /* xgettext: c-format */
2236 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2237 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2238 bfd_get_filename (obfd));
2240 bfd_set_error (bfd_error_wrong_format);
2246 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2248 /* Set up the arch and fields as well as these are probably wrong. */
2249 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2253 /* Check the interworking support. */
2254 if (INTERWORK_SET (ibfd))
2256 if (INTERWORK_SET (obfd))
2258 /* If the src and dest differ in their interworking issue a warning. */
2259 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2263 if (INTERWORK_FLAG (ibfd))
2264 /* xgettext: c-format */
2265 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2267 /* xgettext: c-format */
2268 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2270 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2271 bfd_get_filename (obfd));
2276 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2283 /* Display the flags field. */
2286 coff_arm_print_private_bfd_data (abfd, ptr)
2290 FILE * file = (FILE *) ptr;
2292 BFD_ASSERT (abfd != NULL && ptr != NULL);
2294 /* xgettext:c-format */
2295 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2297 if (APCS_SET (abfd))
2299 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2300 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2302 if (APCS_FLOAT_FLAG (abfd))
2303 fprintf (file, _(" [floats passed in float registers]"));
2305 fprintf (file, _(" [floats passed in integer registers]"));
2307 if (PIC_FLAG (abfd))
2308 fprintf (file, _(" [position independent]"));
2310 fprintf (file, _(" [absolute position]"));
2313 if (! INTERWORK_SET (abfd))
2314 fprintf (file, _(" [interworking flag not initialised]"));
2315 else if (INTERWORK_FLAG (abfd))
2316 fprintf (file, _(" [interworking supported]"));
2318 fprintf (file, _(" [interworking not supported]"));
2325 /* Copies the given flags into the coff_tdata.flags field.
2326 Typically these flags come from the f_flags[] field of
2327 the COFF filehdr structure, which contains important,
2328 target specific information.
2329 Note: Although this function is static, it is explicitly
2330 called from both coffcode.h and peicode.h. */
2333 _bfd_coff_arm_set_private_flags (abfd, flags)
2339 BFD_ASSERT (abfd != NULL);
2341 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2343 /* Make sure that the APCS field has not been initialised to the opposite
2346 && ( (APCS_26_FLAG (abfd) != flag)
2347 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2348 || (PIC_FLAG (abfd) != (flags & F_PIC))
2352 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2354 SET_APCS_FLAGS (abfd, flag);
2356 flag = (flags & F_INTERWORK);
2358 /* If the BFD has already had its interworking flag set, but it
2359 is different from the value that we have been asked to set,
2360 then assume that that merged code will not support interworking
2361 and set the flag accordingly. */
2362 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2365 /* xgettext: c-format */
2366 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2367 bfd_get_filename (abfd));
2369 /* xgettext: c-format */
2370 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2371 bfd_get_filename (abfd));
2375 SET_INTERWORK_FLAG (abfd, flag);
2380 /* Copy the important parts of the target specific data
2381 from one instance of a BFD to another. */
2384 coff_arm_copy_private_bfd_data (src, dest)
2388 BFD_ASSERT (src != NULL && dest != NULL);
2393 /* If the destination is not in the same format as the source, do not do
2395 if (src->xvec != dest->xvec)
2398 /* copy the flags field */
2401 if (APCS_SET (dest))
2403 /* If the src and dest have different APCS flag bits set, fail. */
2404 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2407 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2410 if (PIC_FLAG (dest) != PIC_FLAG (src))
2414 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2418 if (INTERWORK_SET (src))
2420 if (INTERWORK_SET (dest))
2422 /* If the src and dest have different interworking flags then turn
2423 off the interworking bit. */
2424 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2426 if (INTERWORK_FLAG (dest))
2428 /* xgettext:c-format */
2429 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2430 bfd_get_filename (dest),
2431 bfd_get_filename (src));
2434 SET_INTERWORK_FLAG (dest, 0);
2439 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2446 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2447 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2448 #define LOCAL_LABEL_PREFIX ""
2449 #ifndef USER_LABEL_PREFIX
2450 #define USER_LABEL_PREFIX "_"
2453 /* Like _bfd_coff_is_local_label_name, but
2454 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2456 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2457 labels of the form Lxxx to be stripped. */
2459 coff_arm_is_local_label_name (abfd, name)
2460 bfd * abfd ATTRIBUTE_UNUSED;
2463 #ifdef USER_LABEL_PREFIX
2464 if (USER_LABEL_PREFIX[0] != 0)
2466 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2471 #ifdef LOCAL_LABEL_PREFIX
2472 /* If there is a prefix for local labels then look for this.
2473 If the prefix exists, but it is empty, then ignore the test. */
2475 if (LOCAL_LABEL_PREFIX[0] != 0)
2477 int len = strlen (LOCAL_LABEL_PREFIX);
2479 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2482 /* Perform the checks below for the rest of the name. */
2487 return name[0] == 'L';
2490 /* This piece of machinery exists only to guarantee that the bfd that holds
2491 the glue section is written last.
2493 This does depend on bfd_make_section attaching a new section to the
2494 end of the section list for the bfd.
2499 coff_arm_link_output_has_begun (sub, info)
2501 struct coff_final_link_info * info;
2503 return (sub->output_has_begun
2504 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2508 coff_arm_final_link_postscript (abfd, pfinfo)
2509 bfd * abfd ATTRIBUTE_UNUSED;
2510 struct coff_final_link_info * pfinfo;
2512 struct coff_arm_link_hash_table * globals;
2514 globals = coff_arm_hash_table (pfinfo->info);
2516 BFD_ASSERT (globals != NULL);
2518 if (globals->bfd_of_glue_owner != NULL)
2520 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2523 globals->bfd_of_glue_owner->output_has_begun = true;
2529 #include "coffcode.h"
2531 #ifndef TARGET_LITTLE_SYM
2532 #define TARGET_LITTLE_SYM armcoff_little_vec
2534 #ifndef TARGET_LITTLE_NAME
2535 #define TARGET_LITTLE_NAME "coff-arm-little"
2537 #ifndef TARGET_BIG_SYM
2538 #define TARGET_BIG_SYM armcoff_big_vec
2540 #ifndef TARGET_BIG_NAME
2541 #define TARGET_BIG_NAME "coff-arm-big"
2544 #ifndef TARGET_UNDERSCORE
2545 #define TARGET_UNDERSCORE 0
2548 #ifndef EXTRA_S_FLAGS
2550 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2552 #define EXTRA_S_FLAGS 0
2556 /* Forward declaration for use initialising alternative_target field. */
2557 extern const bfd_target TARGET_BIG_SYM ;
2559 /* Target vectors. */
2560 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2561 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)