1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 99, 2000
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #include "coff/internal.h"
36 /* Macros for manipulation the bits in the flags field of the coff data
38 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
39 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
40 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
41 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
42 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
43 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
44 | (flgs | F_APCS_SET))
45 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
46 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
47 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
48 (coff_data (abfd)->flags & ~ F_INTERWORK) \
49 | (flg | F_INTERWORK_SET))
52 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
55 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
56 /* some typedefs for holding instructions */
57 typedef unsigned long int insn32;
58 typedef unsigned short int insn16;
60 /* Forward declarations for stupid compilers. */
61 static boolean coff_arm_relocate_section
62 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
63 struct internal_reloc *, struct internal_syment *, asection **));
64 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
65 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
66 static bfd_reloc_status_type aoutarm_fix_pcrel_26
67 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
68 static bfd_reloc_status_type coff_thumb_pcrel_23
69 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
70 static bfd_reloc_status_type coff_thumb_pcrel_12
71 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
72 static bfd_reloc_status_type coff_thumb_pcrel_9
73 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
74 static bfd_reloc_status_type coff_arm_reloc
75 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
76 static boolean coff_arm_adjust_symndx
77 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
78 asection *, struct internal_reloc *, boolean *));
79 static reloc_howto_type * coff_arm_rtype_to_howto
80 PARAMS ((bfd *, asection *, struct internal_reloc *,
81 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
82 static bfd_reloc_status_type coff_thumb_pcrel_common
83 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
84 thumb_pcrel_branchtype));
85 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
86 PARAMS ((bfd *, bfd_reloc_code_real_type));
87 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
89 static insn32 insert_thumb_branch
90 PARAMS ((insn32, int));
91 static struct coff_link_hash_entry * find_thumb_glue
92 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
93 static struct coff_link_hash_entry * find_arm_glue
94 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
95 #ifndef COFF_IMAGE_WITH_PE
96 static void record_arm_to_thumb_glue
97 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
98 static void record_thumb_to_arm_glue
99 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
101 static boolean coff_arm_merge_private_bfd_data
102 PARAMS ((bfd *, bfd *));
103 static boolean coff_arm_print_private_bfd_data
104 PARAMS ((bfd *, PTR));
105 static boolean _bfd_coff_arm_set_private_flags
106 PARAMS ((bfd *, flagword));
107 static boolean coff_arm_copy_private_bfd_data
108 PARAMS ((bfd *, bfd *));
109 static boolean coff_arm_is_local_label_name
110 PARAMS ((bfd *, const char *));
111 static boolean coff_arm_link_output_has_begun
112 PARAMS ((bfd *, struct coff_final_link_info *));
113 static boolean coff_arm_final_link_postscript
114 PARAMS ((bfd *, struct coff_final_link_info *));
116 /* The linker script knows the section names for placement.
117 The entry_names are used to do simple name mangling on the stubs.
118 Given a function name, and its type, the stub can be found. The
119 name can be changed. The only requirement is the %s be present.
122 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
123 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
125 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
126 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
128 /* Used by the assembler. */
129 static bfd_reloc_status_type
130 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
133 arelent *reloc_entry;
134 asymbol *symbol ATTRIBUTE_UNUSED;
136 asection *input_section ATTRIBUTE_UNUSED;
138 char **error_message ATTRIBUTE_UNUSED;
141 if (output_bfd == (bfd *) NULL)
142 return bfd_reloc_continue;
144 diff = reloc_entry->addend;
147 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
151 reloc_howto_type *howto = reloc_entry->howto;
152 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
158 char x = bfd_get_8 (abfd, addr);
160 bfd_put_8 (abfd, x, addr);
166 short x = bfd_get_16 (abfd, addr);
168 bfd_put_16 (abfd, x, addr);
174 long x = bfd_get_32 (abfd, addr);
176 bfd_put_32 (abfd, x, addr);
185 /* Now let bfd_perform_relocation finish everything up. */
186 return bfd_reloc_continue;
189 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
190 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
192 #ifndef TARGET_UNDERSCORE
193 #define TARGET_UNDERSCORE '_'
197 #define PCRELOFFSET true
200 /* These most certainly belong somewhere else. Just had to get rid of
201 the manifest constants in the code. */
214 #define ARM_THUMB9 12
215 #define ARM_THUMB12 13
216 #define ARM_THUMB23 14
228 #define ARM_THUMB12 4
230 #define ARM_SECTION 14
231 #define ARM_SECREL 15
234 static reloc_howto_type aoutarm_std_reloc_howto[] =
236 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
245 complain_overflow_bitfield,
258 complain_overflow_bitfield,
271 complain_overflow_signed,
272 aoutarm_fix_pcrel_26 ,
284 complain_overflow_signed,
285 coff_thumb_pcrel_12 ,
297 complain_overflow_dont,
298 aoutarm_fix_pcrel_26_done,
318 complain_overflow_bitfield,
331 complain_overflow_bitfield,
338 #else /* not ARM_WINCE */
339 HOWTO(ARM_8, /* type */
343 false, /* pc_relative */
345 complain_overflow_bitfield, /* complain_on_overflow */
346 coff_arm_reloc, /* special_function */
348 true, /* partial_inplace */
349 0x000000ff, /* src_mask */
350 0x000000ff, /* dst_mask */
351 PCRELOFFSET /* pcrel_offset */),
358 complain_overflow_bitfield,
371 complain_overflow_bitfield,
384 complain_overflow_signed,
385 aoutarm_fix_pcrel_26 ,
397 complain_overflow_signed,
410 complain_overflow_signed,
423 complain_overflow_signed,
436 complain_overflow_dont,
437 aoutarm_fix_pcrel_26_done,
451 complain_overflow_bitfield,
464 complain_overflow_bitfield,
477 complain_overflow_bitfield,
490 complain_overflow_signed,
503 complain_overflow_signed,
504 coff_thumb_pcrel_12 ,
516 complain_overflow_signed,
517 coff_thumb_pcrel_23 ,
523 #endif /* not ARM_WINCE */
526 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
529 /* Return true if this relocation should
530 appear in the output .reloc section. */
533 in_reloc_p (abfd, howto)
534 bfd * abfd ATTRIBUTE_UNUSED;
535 reloc_howto_type * howto;
537 return !howto->pc_relative && howto->type != ARM_RVA32;
541 #define RTYPE2HOWTO(cache_ptr, dst) \
542 (cache_ptr)->howto = \
543 (dst)->r_type < NUM_RELOCS \
544 ? aoutarm_std_reloc_howto + (dst)->r_type \
547 #define coff_rtype_to_howto coff_arm_rtype_to_howto
549 static reloc_howto_type *
550 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
551 bfd *abfd ATTRIBUTE_UNUSED;
553 struct internal_reloc *rel;
554 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
555 struct internal_syment *sym ATTRIBUTE_UNUSED;
558 reloc_howto_type * howto;
560 if (rel->r_type >= NUM_RELOCS)
563 howto = aoutarm_std_reloc_howto + rel->r_type;
565 if (rel->r_type == ARM_RVA32)
566 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
570 /* Used by the assembler. */
572 static bfd_reloc_status_type
573 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
574 output_bfd, error_message)
575 bfd *abfd ATTRIBUTE_UNUSED;
576 arelent *reloc_entry ATTRIBUTE_UNUSED;
577 asymbol *symbol ATTRIBUTE_UNUSED;
578 PTR data ATTRIBUTE_UNUSED;
579 asection *input_section ATTRIBUTE_UNUSED;
580 bfd *output_bfd ATTRIBUTE_UNUSED;
581 char **error_message ATTRIBUTE_UNUSED;
583 /* This is dead simple at present. */
587 /* Used by the assembler. */
589 static bfd_reloc_status_type
590 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
591 output_bfd, error_message)
593 arelent *reloc_entry;
596 asection *input_section;
598 char **error_message ATTRIBUTE_UNUSED;
601 bfd_size_type addr = reloc_entry->address;
602 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
603 bfd_reloc_status_type flag = bfd_reloc_ok;
605 /* If this is an undefined symbol, return error */
606 if (symbol->section == &bfd_und_section
607 && (symbol->flags & BSF_WEAK) == 0)
608 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
610 /* If the sections are different, and we are doing a partial relocation,
611 just ignore it for now. */
612 if (symbol->section->name != input_section->name
613 && output_bfd != (bfd *)NULL)
614 return bfd_reloc_continue;
616 relocation = (target & 0x00ffffff) << 2;
617 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
618 relocation += symbol->value;
619 relocation += symbol->section->output_section->vma;
620 relocation += symbol->section->output_offset;
621 relocation += reloc_entry->addend;
622 relocation -= input_section->output_section->vma;
623 relocation -= input_section->output_offset;
627 return bfd_reloc_overflow;
629 /* Check for overflow */
630 if (relocation & 0x02000000)
632 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
633 flag = bfd_reloc_overflow;
635 else if (relocation & ~0x03ffffff)
636 flag = bfd_reloc_overflow;
638 target &= ~0x00ffffff;
639 target |= (relocation >> 2) & 0x00ffffff;
640 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
642 /* Now the ARM magic... Change the reloc type so that it is marked as done.
643 Strictly this is only necessary if we are doing a partial relocation. */
644 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
649 static bfd_reloc_status_type
650 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
651 output_bfd, error_message, btype)
653 arelent *reloc_entry;
656 asection *input_section;
658 char **error_message ATTRIBUTE_UNUSED;
659 thumb_pcrel_branchtype btype;
661 bfd_vma relocation = 0;
662 bfd_size_type addr = reloc_entry->address;
663 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
664 bfd_reloc_status_type flag = bfd_reloc_ok;
669 /* NOTE: This routine is currently used by GAS, but not by the link
677 signbit = 0x00000100;
683 signbit = 0x00000800;
689 signbit = 0x00400000;
696 /* If this is an undefined symbol, return error */
697 if (symbol->section == &bfd_und_section
698 && (symbol->flags & BSF_WEAK) == 0)
699 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
701 /* If the sections are different, and we are doing a partial relocation,
702 just ignore it for now. */
703 if (symbol->section->name != input_section->name
704 && output_bfd != (bfd *)NULL)
705 return bfd_reloc_continue;
711 relocation = ((target & dstmsk) << 1);
715 if (bfd_big_endian (abfd))
716 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
718 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
725 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
726 relocation += symbol->value;
727 relocation += symbol->section->output_section->vma;
728 relocation += symbol->section->output_offset;
729 relocation += reloc_entry->addend;
730 relocation -= input_section->output_section->vma;
731 relocation -= input_section->output_offset;
735 return bfd_reloc_overflow;
737 /* Check for overflow */
738 if (relocation & signbit)
740 if ((relocation & ~offmsk) != ~offmsk)
741 flag = bfd_reloc_overflow;
743 else if (relocation & ~offmsk)
744 flag = bfd_reloc_overflow;
751 target |= (relocation >> 1);
755 if (bfd_big_endian (abfd))
756 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
758 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
765 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
767 /* Now the ARM magic... Change the reloc type so that it is marked as done.
768 Strictly this is only necessary if we are doing a partial relocation. */
769 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
771 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
775 static bfd_reloc_status_type
776 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
777 output_bfd, error_message)
779 arelent *reloc_entry;
782 asection *input_section;
784 char **error_message;
786 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
787 input_section, output_bfd, error_message, b23);
790 static bfd_reloc_status_type
791 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
792 output_bfd, error_message)
794 arelent *reloc_entry;
797 asection *input_section;
799 char **error_message;
801 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
802 input_section, output_bfd, error_message, b12);
805 static bfd_reloc_status_type
806 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
807 output_bfd, error_message)
809 arelent *reloc_entry;
812 asection *input_section;
814 char **error_message;
816 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
817 input_section, output_bfd, error_message, b9);
820 static CONST struct reloc_howto_struct *
821 coff_arm_reloc_type_lookup (abfd, code)
823 bfd_reloc_code_real_type code;
825 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
827 if (code == BFD_RELOC_CTOR)
828 switch (bfd_get_arch_info (abfd)->bits_per_address)
833 default: return (CONST struct reloc_howto_struct *) 0;
839 ASTD (BFD_RELOC_32, ARM_32);
840 ASTD (BFD_RELOC_RVA, ARM_RVA32);
841 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
842 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
844 ASTD (BFD_RELOC_8, ARM_8);
845 ASTD (BFD_RELOC_16, ARM_16);
846 ASTD (BFD_RELOC_32, ARM_32);
847 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
848 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
849 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
850 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
851 ASTD (BFD_RELOC_RVA, ARM_RVA32);
852 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
853 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
854 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
856 default: return (CONST struct reloc_howto_struct *) 0;
860 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
861 #define COFF_PAGE_SIZE 0x1000
862 /* Turn a howto into a reloc nunmber */
864 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
865 #define BADMAG(x) ARMBADMAG(x)
866 #define ARM 1 /* Customize coffcode.h */
868 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
869 This allows us to store global data here without actually creating any
870 global variables, which is a no-no in the BFD world. */
871 struct coff_arm_link_hash_table
873 /* The original coff_link_hash_table structure. MUST be first field. */
874 struct coff_link_hash_table root;
876 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
877 long int thumb_glue_size;
879 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
880 long int arm_glue_size;
882 /* An arbitary input BFD chosen to hold the glue sections. */
883 bfd * bfd_of_glue_owner;
885 /* Support interworking with old, non-interworking aware ARM code. */
886 int support_old_code;
889 /* Get the ARM coff linker hash table from a link_info structure. */
890 #define coff_arm_hash_table(info) \
891 ((struct coff_arm_link_hash_table *) ((info)->hash))
893 /* Create an ARM coff linker hash table. */
895 static struct bfd_link_hash_table *
896 coff_arm_link_hash_table_create (abfd)
899 struct coff_arm_link_hash_table * ret;
901 ret = ((struct coff_arm_link_hash_table *)
902 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
903 if (ret == (struct coff_arm_link_hash_table *) NULL)
906 if (! _bfd_coff_link_hash_table_init
907 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
909 bfd_release (abfd, ret);
910 return (struct bfd_link_hash_table *) NULL;
913 ret->thumb_glue_size = 0;
914 ret->arm_glue_size = 0;
915 ret->bfd_of_glue_owner = NULL;
917 return & ret->root.root;
921 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
922 struct bfd_link_info *info;
924 asection *input_section;
925 bfd_vma reloc_offset;
927 bfd_vma addr = reloc_offset
929 + input_section->output_offset
930 + input_section->output_section->vma;
932 if (coff_data(output_bfd)->pe)
933 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
934 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
938 /* The thumb form of a long branch is a bit finicky, because the offset
939 encoding is split over two fields, each in it's own instruction. They
940 can occur in any order. So given a thumb form of long branch, and an
941 offset, insert the offset into the thumb branch and return finished
944 It takes two thumb instructions to encode the target address. Each has
945 11 bits to invest. The upper 11 bits are stored in one (identifed by
946 H-0.. see below), the lower 11 bits are stored in the other (identified
949 Combine together and shifted left by 1 (it's a half word address) and
953 H-0, upper address-0 = 000
955 H-1, lower address-0 = 800
957 They can be ordered either way, but the arm tools I've seen always put
958 the lower one first. It probably doesn't matter. krk@cygnus.com
960 XXX: Actually the order does matter. The second instruction (H-1)
961 moves the computed address into the PC, so it must be the second one
962 in the sequence. The problem, however is that whilst little endian code
963 stores the instructions in HI then LOW order, big endian code does the
964 reverse. nickc@cygnus.com */
966 #define LOW_HI_ORDER 0xF800F000
967 #define HI_LOW_ORDER 0xF000F800
970 insert_thumb_branch (br_insn, rel_off)
974 unsigned int low_bits;
975 unsigned int high_bits;
977 BFD_ASSERT((rel_off & 1) != 1);
979 rel_off >>= 1; /* half word aligned address */
980 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
981 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
983 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
984 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
985 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
986 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
988 abort (); /* error - not a valid branch instruction form */
990 /* FIXME: abort is probably not the right call. krk@cygnus.com */
996 static struct coff_link_hash_entry *
997 find_thumb_glue (info, name, input_bfd)
998 struct bfd_link_info * info;
1003 struct coff_link_hash_entry * myh;
1005 tmp_name = ((char *)
1006 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1008 BFD_ASSERT (tmp_name);
1010 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1012 myh = coff_link_hash_lookup
1013 (coff_hash_table (info), tmp_name, false, false, true);
1016 /* xgettext:c-format */
1017 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1018 bfd_get_filename (input_bfd), tmp_name, name);
1025 static struct coff_link_hash_entry *
1026 find_arm_glue (info, name, input_bfd)
1027 struct bfd_link_info * info;
1032 struct coff_link_hash_entry * myh;
1034 tmp_name = ((char *)
1035 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1037 BFD_ASSERT (tmp_name);
1039 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1041 myh = coff_link_hash_lookup
1042 (coff_hash_table (info), tmp_name, false, false, true);
1045 /* xgettext:c-format */
1046 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1047 bfd_get_filename (input_bfd), tmp_name, name);
1059 ldr r12, __func_addr
1062 .word func @ behave as if you saw a ARM_32 reloc
1065 #define ARM2THUMB_GLUE_SIZE 12
1066 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1067 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1068 static const insn32 a2t3_func_addr_insn = 0x00000001;
1071 Thumb->ARM: Thumb->(non-interworking aware) ARM
1075 __func_from_thumb: __func_from_thumb:
1077 nop ldr r6, __func_addr
1079 __func_change_to_arm: bx r6
1081 __func_back_to_thumb:
1088 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1089 static const insn16 t2a1_bx_pc_insn = 0x4778;
1090 static const insn16 t2a2_noop_insn = 0x46c0;
1091 static const insn32 t2a3_b_insn = 0xea000000;
1093 static const insn16 t2a1_push_insn = 0xb540;
1094 static const insn16 t2a2_ldr_insn = 0x4e03;
1095 static const insn16 t2a3_mov_insn = 0x46fe;
1096 static const insn16 t2a4_bx_insn = 0x4730;
1097 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1098 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1101 We should really create new local (static) symbols in destination
1102 object for each stub we create. We should also create local
1103 (static) symbols within the stubs when switching between ARM and
1104 Thumb code. This will ensure that the debugger and disassembler
1105 can present a better view of stubs.
1107 We can treat stubs like literal sections, and for the THUMB9 ones
1108 (short addressing range) we should be able to insert the stubs
1109 between sections. i.e. the simplest approach (since relocations
1110 are done on a section basis) is to dump the stubs at the end of
1111 processing a section. That way we can always try and minimise the
1112 offset to and from a stub. However, this does not map well onto
1113 the way that the linker/BFD does its work: mapping all input
1114 sections to output sections via the linker script before doing
1117 Unfortunately it may be easier to just to disallow short range
1118 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1119 only branch-and-link (BL) calls. This will simplify the processing
1120 since we can then put all of the stubs into their own section.
1123 On a different subject, rather than complaining when a
1124 branch cannot fit in the number of bits available for the
1125 instruction we should generate a trampoline stub (needed to
1126 address the complete 32bit address space). */
1128 /* The standard COFF backend linker does not cope with the special
1129 Thumb BRANCH23 relocation. The alternative would be to split the
1130 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1131 bit simpler simply providing our own relocation driver. */
1133 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1134 This code is a very slightly modified copy of
1135 _bfd_coff_generic_relocate_section. It would be a much more
1136 maintainable solution to have a MACRO that could be expanded within
1137 _bfd_coff_generic_relocate_section that would only be provided for
1138 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1139 is different from the original. */
1142 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1143 contents, relocs, syms, sections)
1145 struct bfd_link_info *info;
1147 asection *input_section;
1149 struct internal_reloc *relocs;
1150 struct internal_syment *syms;
1151 asection **sections;
1153 struct internal_reloc * rel;
1154 struct internal_reloc * relend;
1157 relend = rel + input_section->reloc_count;
1159 for (; rel < relend; rel++)
1163 struct coff_link_hash_entry * h;
1164 struct internal_syment * sym;
1167 reloc_howto_type * howto;
1168 bfd_reloc_status_type rstat;
1171 symndx = rel->r_symndx;
1180 h = obj_coff_sym_hashes (input_bfd)[symndx];
1181 sym = syms + symndx;
1184 /* COFF treats common symbols in one of two ways. Either the
1185 size of the symbol is included in the section contents, or it
1186 is not. We assume that the size is not included, and force
1187 the rtype_to_howto function to adjust the addend as needed. */
1189 if (sym != NULL && sym->n_scnum != 0)
1190 addend = - sym->n_value;
1194 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1199 /* The relocation_section function will skip pcrel_offset relocs
1200 when doing a relocateable link. However, we want to convert
1201 ARM26 to ARM26D relocs if possible. We return a fake howto in
1202 this case without pcrel_offset set, and adjust the addend to
1204 if (rel->r_type == ARM_26
1206 && info->relocateable
1207 && (h->root.type == bfd_link_hash_defined
1208 || h->root.type == bfd_link_hash_defweak)
1209 && h->root.u.def.section->output_section == input_section->output_section)
1211 static reloc_howto_type fake_arm26_reloc =
1218 complain_overflow_signed,
1219 aoutarm_fix_pcrel_26 ,
1226 addend -= rel->r_vaddr - input_section->vma;
1227 howto = &fake_arm26_reloc;
1231 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1232 the next opcode's pc, so is off by one. */
1233 if (howto->pc_relative && !info->relocateable)
1237 /* If we are doing a relocateable link, then we can just ignore
1238 a PC relative reloc that is pcrel_offset. It will already
1239 have the correct value. If this is not a relocateable link,
1240 then we should ignore the symbol value. */
1241 if (howto->pc_relative && howto->pcrel_offset)
1243 if (info->relocateable)
1245 #if 0 /* We must not ignore the symbol value. If the symbol is
1246 within the same section, the relocation should have already
1247 been fixed, but if it is not, we'll be handed a reloc into
1248 the beginning of the symbol's section, so we must not cancel
1249 out the symbol's value, otherwise we'll be adding it in
1251 if (sym != NULL && sym->n_scnum != 0)
1252 addend += sym->n_value;
1264 sec = bfd_abs_section_ptr;
1269 sec = sections[symndx];
1270 val = (sec->output_section->vma
1271 + sec->output_offset
1278 #if 1 /* THUMBEXTENSION */
1279 /* We don't output the stubs if we are generating a
1280 relocatable output file, since we may as well leave the
1281 stub generation to the final linker pass. If we fail to
1282 verify that the name is defined, we'll try to build stubs
1283 for an undefined name... */
1284 if (! info->relocateable
1285 && ( h->root.type == bfd_link_hash_defined
1286 || h->root.type == bfd_link_hash_defweak))
1288 asection * h_sec = h->root.u.def.section;
1289 const char * name = h->root.root.string;
1291 /* h locates the symbol referenced in the reloc. */
1292 h_val = (h->root.u.def.value
1293 + h_sec->output_section->vma
1294 + h_sec->output_offset);
1296 if (howto->type == ARM_26)
1298 if ( h->class == C_THUMBSTATFUNC
1299 || h->class == C_THUMBEXTFUNC)
1301 /* Arm code calling a Thumb function */
1302 unsigned long int tmp;
1305 long int ret_offset;
1306 struct coff_link_hash_entry * myh;
1307 struct coff_arm_link_hash_table * globals;
1309 myh = find_arm_glue (info, name, input_bfd);
1313 globals = coff_arm_hash_table (info);
1315 BFD_ASSERT (globals != NULL);
1316 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1318 my_offset = myh->root.u.def.value;
1320 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1321 ARM2THUMB_GLUE_SECTION_NAME);
1322 BFD_ASSERT (s != NULL);
1323 BFD_ASSERT (s->contents != NULL);
1324 BFD_ASSERT (s->output_section != NULL);
1326 if ((my_offset & 0x01) == 0x01)
1328 if (h_sec->owner != NULL
1329 && INTERWORK_SET (h_sec->owner)
1330 && ! INTERWORK_FLAG (h_sec->owner))
1333 /* xgettext:c-format */
1334 (_("%s(%s): warning: interworking not enabled."),
1335 bfd_get_filename (h_sec->owner), name);
1337 /* xgettext:c-format */
1338 (_(" first occurrence: %s: arm call to thumb"),
1339 bfd_get_filename (input_bfd));
1343 myh->root.u.def.value = my_offset;
1345 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1346 s->contents + my_offset);
1348 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1349 s->contents + my_offset + 4);
1351 /* It's a thumb address. Add the low order bit. */
1352 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1353 s->contents + my_offset + 8);
1355 if (info->base_file)
1356 arm_emit_base_file_entry (info, output_bfd, s,
1361 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1363 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1364 - input_section->vma);
1366 tmp = tmp & 0xFF000000;
1368 /* Somehow these are both 4 too far, so subtract 8. */
1372 + s->output_section->vma
1373 - (input_section->output_offset
1374 + input_section->output_section->vma
1378 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1380 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1381 - input_section->vma);
1387 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1388 else if (howto->type == ARM_THUMB23)
1390 if ( h->class == C_EXT
1391 || h->class == C_STAT
1392 || h->class == C_LABEL)
1394 /* Thumb code calling an ARM function */
1397 unsigned long int tmp;
1398 long int ret_offset;
1399 struct coff_link_hash_entry * myh;
1400 struct coff_arm_link_hash_table * globals;
1402 myh = find_thumb_glue (info, name, input_bfd);
1406 globals = coff_arm_hash_table (info);
1408 BFD_ASSERT (globals != NULL);
1409 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1411 my_offset = myh->root.u.def.value;
1413 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1414 THUMB2ARM_GLUE_SECTION_NAME);
1416 BFD_ASSERT (s != NULL);
1417 BFD_ASSERT (s->contents != NULL);
1418 BFD_ASSERT (s->output_section != NULL);
1420 if ((my_offset & 0x01) == 0x01)
1422 if (h_sec->owner != NULL
1423 && INTERWORK_SET (h_sec->owner)
1424 && ! INTERWORK_FLAG (h_sec->owner)
1425 && ! globals->support_old_code)
1428 /* xgettext:c-format */
1429 (_("%s(%s): warning: interworking not enabled."),
1430 bfd_get_filename (h_sec->owner), name);
1432 /* xgettext:c-format */
1433 (_(" first occurrence: %s: thumb call to arm"),
1434 bfd_get_filename (input_bfd));
1436 (_(" consider relinking with --support-old-code enabled"));
1440 myh->root.u.def.value = my_offset;
1442 if (globals->support_old_code)
1444 bfd_put_16 (output_bfd, t2a1_push_insn,
1445 s->contents + my_offset);
1447 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1448 s->contents + my_offset + 2);
1450 bfd_put_16 (output_bfd, t2a3_mov_insn,
1451 s->contents + my_offset + 4);
1453 bfd_put_16 (output_bfd, t2a4_bx_insn,
1454 s->contents + my_offset + 6);
1456 bfd_put_32 (output_bfd, t2a5_pop_insn,
1457 s->contents + my_offset + 8);
1459 bfd_put_32 (output_bfd, t2a6_bx_insn,
1460 s->contents + my_offset + 12);
1462 /* Store the address of the function in the last word of the stub. */
1463 bfd_put_32 (output_bfd, h_val,
1464 s->contents + my_offset + 16);
1466 if (info->base_file)
1467 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1471 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1472 s->contents + my_offset);
1474 bfd_put_16 (output_bfd, t2a2_noop_insn,
1475 s->contents + my_offset + 2);
1478 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1480 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1481 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1482 + s->output_section->vma) /* Address of the start of the current section. */
1483 + 4 /* The branch instruction is 4 bytes into the stub. */
1484 + 8); /* ARM branches work from the pc of the instruction + 8. */
1486 bfd_put_32 (output_bfd,
1487 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1488 s->contents + my_offset + 4);
1493 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1495 /* Now go back and fix up the original BL insn to point
1500 - (input_section->output_offset
1504 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1505 - input_section->vma);
1507 bfd_put_32 (output_bfd,
1508 insert_thumb_branch (tmp, ret_offset),
1509 contents + rel->r_vaddr
1510 - input_section->vma);
1518 /* If the relocation type and destination symbol does not
1519 fall into one of the above categories, then we can just
1520 perform a direct link. */
1523 rstat = bfd_reloc_ok;
1525 #endif /* THUMBEXTENSION */
1526 if ( h->root.type == bfd_link_hash_defined
1527 || h->root.type == bfd_link_hash_defweak)
1531 sec = h->root.u.def.section;
1532 val = (h->root.u.def.value
1533 + sec->output_section->vma
1534 + sec->output_offset);
1537 else if (! info->relocateable)
1539 if (! ((*info->callbacks->undefined_symbol)
1540 (info, h->root.root.string, input_bfd, input_section,
1541 rel->r_vaddr - input_section->vma, true)))
1546 if (info->base_file)
1548 /* Emit a reloc if the backend thinks it needs it. */
1549 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1550 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1553 #if 1 /* THUMBEXTENSION */
1555 rstat = bfd_reloc_ok;
1557 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1558 else if (! info->relocateable
1559 && howto->type == ARM_THUMB23)
1561 /* This is pretty much a copy of what the default
1562 _bfd_final_link_relocate and _bfd_relocate_contents
1563 routines do to perform a relocation, with special
1564 processing for the split addressing of the Thumb BL
1565 instruction. Again, it would probably be simpler adding a
1566 ThumbBRANCH23 specific macro expansion into the default
1569 bfd_vma address = rel->r_vaddr - input_section->vma;
1571 if (address > input_section->_raw_size)
1572 rstat = bfd_reloc_outofrange;
1575 bfd_vma relocation = val + addend;
1576 int size = bfd_get_reloc_size (howto);
1577 boolean overflow = false;
1578 bfd_byte * location = contents + address;
1579 bfd_vma x = bfd_get_32 (input_bfd, location);
1580 bfd_vma src_mask = 0x007FFFFE;
1581 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1582 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1584 bfd_signed_vma signed_check;
1586 bfd_signed_vma signed_add;
1588 BFD_ASSERT (size == 4);
1590 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1591 relocation -= (input_section->output_section->vma
1592 + input_section->output_offset);
1594 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1595 relocation -= address;
1597 /* No need to negate the relocation with BRANCH23. */
1598 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1599 /* howto->rightshift == 1 */
1600 /* Drop unwanted bits from the value we are relocating to. */
1602 check = relocation >> howto->rightshift;
1604 /* If this is a signed value, the rightshift just dropped
1605 leading 1 bits (assuming twos complement). */
1606 if ((bfd_signed_vma) relocation >= 0)
1607 signed_check = check;
1609 signed_check = (check
1611 & ~((bfd_vma) - 1 >> howto->rightshift)));
1613 /* Get the value from the object file. */
1614 if (bfd_big_endian (input_bfd))
1616 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1620 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1623 /* Get the value from the object file with an appropriate sign.
1624 The expression involving howto->src_mask isolates the upper
1625 bit of src_mask. If that bit is set in the value we are
1626 adding, it is negative, and we subtract out that number times
1627 two. If src_mask includes the highest possible bit, then we
1628 can not get the upper bit, but that does not matter since
1629 signed_add needs no adjustment to become negative in that
1634 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1635 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1637 /* Add the value from the object file, shifted so that it is a
1639 /* howto->bitpos == 0 */
1641 signed_check += signed_add;
1642 relocation += signed_add;
1644 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1646 /* Assumes two's complement. */
1647 if ( signed_check > reloc_signed_max
1648 || signed_check < reloc_signed_min)
1651 /* Put RELOCATION into the correct bits: */
1653 if (bfd_big_endian (input_bfd))
1655 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1659 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1662 /* Add RELOCATION to the correct bits of X: */
1663 x = ((x & ~howto->dst_mask) | relocation);
1665 /* Put the relocated value back in the object file: */
1666 bfd_put_32 (input_bfd, x, location);
1668 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1673 #endif /* THUMBEXTENSION */
1674 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1676 rel->r_vaddr - input_section->vma,
1678 #if 1 /* THUMBEXTENSION */
1680 Is this the best way to fix up thumb addresses? krk@cygnus.com
1681 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1682 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1683 if (! info->relocateable
1684 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1686 /* Determine if we need to set the bottom bit of a relocated address
1687 because the address is the address of a Thumb code symbol. */
1689 int patchit = false;
1692 && ( h->class == C_THUMBSTATFUNC
1693 || h->class == C_THUMBEXTFUNC))
1697 else if (sym != NULL
1698 && sym->n_scnum > N_UNDEF)
1700 /* No hash entry - use the symbol instead. */
1702 if ( sym->n_sclass == C_THUMBSTATFUNC
1703 || sym->n_sclass == C_THUMBEXTFUNC)
1709 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1710 bfd_vma x = bfd_get_32 (input_bfd, location);
1712 bfd_put_32 (input_bfd, x | 1, location);
1715 #endif /* THUMBEXTENSION */
1723 case bfd_reloc_outofrange:
1724 (*_bfd_error_handler)
1725 (_("%s: bad reloc address 0x%lx in section `%s'"),
1726 bfd_get_filename (input_bfd),
1727 (unsigned long) rel->r_vaddr,
1728 bfd_get_section_name (input_bfd, input_section));
1730 case bfd_reloc_overflow:
1733 char buf[SYMNMLEN + 1];
1738 name = h->root.root.string;
1741 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1746 if (! ((*info->callbacks->reloc_overflow)
1747 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1748 input_section, rel->r_vaddr - input_section->vma)))
1757 #ifndef COFF_IMAGE_WITH_PE
1760 bfd_arm_allocate_interworking_sections (info)
1761 struct bfd_link_info * info;
1765 struct coff_arm_link_hash_table * globals;
1767 static char test_char = '1';
1770 globals = coff_arm_hash_table (info);
1772 BFD_ASSERT (globals != NULL);
1774 if (globals->arm_glue_size != 0)
1776 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1778 s = bfd_get_section_by_name
1779 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1781 BFD_ASSERT (s != NULL);
1783 foo = (bfd_byte *) bfd_alloc
1784 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1786 memset (foo, test_char, globals->arm_glue_size);
1789 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1793 if (globals->thumb_glue_size != 0)
1795 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1797 s = bfd_get_section_by_name
1798 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1800 BFD_ASSERT (s != NULL);
1802 foo = (bfd_byte *) bfd_alloc
1803 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1805 memset (foo, test_char, globals->thumb_glue_size);
1808 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1816 record_arm_to_thumb_glue (info, h)
1817 struct bfd_link_info * info;
1818 struct coff_link_hash_entry * h;
1820 const char * name = h->root.root.string;
1821 register asection * s;
1823 struct coff_link_hash_entry * myh;
1824 struct coff_arm_link_hash_table * globals;
1826 globals = coff_arm_hash_table (info);
1828 BFD_ASSERT (globals != NULL);
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 tmp_name = ((char *)
1837 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1839 BFD_ASSERT (tmp_name);
1841 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1843 myh = coff_link_hash_lookup
1844 (coff_hash_table (info), tmp_name, false, false, true);
1849 return; /* we've already seen this guy */
1852 /* The only trick here is using globals->arm_glue_size as the value. Even
1853 though the section isn't allocated yet, this is where we will be putting
1856 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1858 s, globals->arm_glue_size + 1,
1860 (struct bfd_link_hash_entry **) & myh);
1864 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1870 record_thumb_to_arm_glue (info, h)
1871 struct bfd_link_info * info;
1872 struct coff_link_hash_entry * h;
1874 const char * name = h->root.root.string;
1875 register asection * s;
1877 struct coff_link_hash_entry * myh;
1878 struct coff_arm_link_hash_table * globals;
1880 globals = coff_arm_hash_table (info);
1882 BFD_ASSERT (globals != NULL);
1883 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1885 s = bfd_get_section_by_name
1886 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1888 BFD_ASSERT (s != NULL);
1890 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1892 BFD_ASSERT (tmp_name);
1894 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1896 myh = coff_link_hash_lookup
1897 (coff_hash_table (info), tmp_name, false, false, true);
1902 return; /* we've already seen this guy */
1905 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1906 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1908 (struct bfd_link_hash_entry **) & myh);
1910 /* If we mark it 'thumb', the disassembler will do a better job. */
1911 myh->class = C_THUMBEXTFUNC;
1915 /* Allocate another symbol to mark where we switch to arm mode. */
1917 #define CHANGE_TO_ARM "__%s_change_to_arm"
1918 #define BACK_FROM_ARM "__%s_back_from_arm"
1920 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1922 BFD_ASSERT (tmp_name);
1924 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1928 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1929 BSF_LOCAL, s, globals->thumb_glue_size
1930 + (globals->support_old_code ? 8 : 4),
1932 (struct bfd_link_hash_entry **) & myh);
1936 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1941 /* Select a BFD to be used to hold the sections used by the glue code.
1942 This function is called from the linker scripts in ld/emultempl/
1946 bfd_arm_get_bfd_for_interworking (abfd, info)
1948 struct bfd_link_info * info;
1950 struct coff_arm_link_hash_table * globals;
1954 /* If we are only performing a partial link do not bother
1955 getting a bfd to hold the glue. */
1956 if (info->relocateable)
1959 globals = coff_arm_hash_table (info);
1961 BFD_ASSERT (globals != NULL);
1963 if (globals->bfd_of_glue_owner != NULL)
1966 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1970 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1972 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1975 || ! bfd_set_section_flags (abfd, sec, flags)
1976 || ! bfd_set_section_alignment (abfd, sec, 2))
1980 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1984 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1986 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1989 || ! bfd_set_section_flags (abfd, sec, flags)
1990 || ! bfd_set_section_alignment (abfd, sec, 2))
1994 /* Save the bfd for later use. */
1995 globals->bfd_of_glue_owner = abfd;
2001 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2003 struct bfd_link_info * info;
2004 int support_old_code;
2007 struct coff_arm_link_hash_table * globals;
2009 /* If we are only performing a partial link do not bother
2010 to construct any glue. */
2011 if (info->relocateable)
2014 /* Here we have a bfd that is to be included on the link. We have a hook
2015 to do reloc rummaging, before section sizes are nailed down. */
2017 _bfd_coff_get_external_symbols (abfd);
2019 globals = coff_arm_hash_table (info);
2021 BFD_ASSERT (globals != NULL);
2022 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2024 globals->support_old_code = support_old_code;
2026 /* Rummage around all the relocs and map the glue vectors. */
2027 sec = abfd->sections;
2032 for (; sec != NULL; sec = sec->next)
2034 struct internal_reloc * i;
2035 struct internal_reloc * rel;
2037 if (sec->reloc_count == 0)
2040 /* Load the relocs. */
2041 /* FIXME: there may be a storage leak here. */
2043 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2045 BFD_ASSERT (i != 0);
2047 for (rel = i; rel < i + sec->reloc_count; ++rel)
2049 unsigned short r_type = rel->r_type;
2051 struct coff_link_hash_entry * h;
2053 symndx = rel->r_symndx;
2055 /* If the relocation is not against a symbol it cannot concern us. */
2059 /* If the index is outside of the range of our table, something has gone wrong. */
2060 if (symndx >= obj_conv_table_size (abfd))
2062 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2063 bfd_get_filename (abfd), symndx);
2067 h = obj_coff_sym_hashes (abfd)[symndx];
2069 /* If the relocation is against a static symbol it must be within
2070 the current section and so cannot be a cross ARM/Thumb relocation. */
2077 /* This one is a call from arm code. We need to look up
2078 the target of the call. If it is a thumb target, we
2081 if (h->class == C_THUMBEXTFUNC)
2082 record_arm_to_thumb_glue (info, h);
2087 /* This one is a call from thumb code. We used to look
2088 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2089 up the target of the call. If it is an arm target, we
2090 insert glue. If the symbol does not exist it will be
2091 given a class of C_EXT and so we will generate a stub
2092 for it. This is not really a problem, since the link
2093 is doomed anyway. */
2100 record_thumb_to_arm_glue (info, h);
2117 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2119 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2120 #define coff_relocate_section coff_arm_relocate_section
2121 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2122 #define coff_adjust_symndx coff_arm_adjust_symndx
2123 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2124 #define coff_final_link_postscript coff_arm_final_link_postscript
2125 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2126 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2127 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2128 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2129 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2131 /* When doing a relocateable link, we want to convert ARM26 relocs
2132 into ARM26D relocs. */
2135 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2136 bfd *obfd ATTRIBUTE_UNUSED;
2137 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2140 struct internal_reloc *irel;
2143 if (irel->r_type == 3)
2145 struct coff_link_hash_entry *h;
2147 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2149 && (h->root.type == bfd_link_hash_defined
2150 || h->root.type == bfd_link_hash_defweak)
2151 && h->root.u.def.section->output_section == sec->output_section)
2158 /* Called when merging the private data areas of two BFDs.
2159 This is important as it allows us to detect if we are
2160 attempting to merge binaries compiled for different ARM
2161 targets, eg different CPUs or differents APCS's. */
2164 coff_arm_merge_private_bfd_data (ibfd, obfd)
2168 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2173 /* If the two formats are different we cannot merge anything.
2174 This is not an error, since it is permissable to change the
2175 input and output formats. */
2176 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2177 || obfd->xvec->flavour != bfd_target_coff_flavour)
2180 /* Verify that the APCS is the same for the two BFDs */
2181 if (APCS_SET (ibfd))
2183 if (APCS_SET (obfd))
2185 /* If the src and dest have different APCS flag bits set, fail. */
2186 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2189 /* xgettext: c-format */
2190 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2191 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2192 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2195 bfd_set_error (bfd_error_wrong_format);
2199 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2203 if (APCS_FLOAT_FLAG (ibfd))
2204 /* xgettext: c-format */
2205 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2207 /* xgettext: c-format */
2208 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2210 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2211 bfd_get_filename (obfd));
2213 bfd_set_error (bfd_error_wrong_format);
2217 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2221 if (PIC_FLAG (ibfd))
2222 /* xgettext: c-format */
2223 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2225 /* xgettext: c-format */
2226 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2227 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2228 bfd_get_filename (obfd));
2230 bfd_set_error (bfd_error_wrong_format);
2236 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2238 /* Set up the arch and fields as well as these are probably wrong. */
2239 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2243 /* Check the interworking support. */
2244 if (INTERWORK_SET (ibfd))
2246 if (INTERWORK_SET (obfd))
2248 /* If the src and dest differ in their interworking issue a warning. */
2249 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2253 if (INTERWORK_FLAG (ibfd))
2254 /* xgettext: c-format */
2255 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2257 /* xgettext: c-format */
2258 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2260 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2261 bfd_get_filename (obfd));
2266 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2273 /* Display the flags field. */
2276 coff_arm_print_private_bfd_data (abfd, ptr)
2280 FILE * file = (FILE *) ptr;
2282 BFD_ASSERT (abfd != NULL && ptr != NULL);
2284 /* xgettext:c-format */
2285 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2287 if (APCS_SET (abfd))
2289 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2290 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2292 if (APCS_FLOAT_FLAG (abfd))
2293 fprintf (file, _(" [floats passed in float registers]"));
2295 fprintf (file, _(" [floats passed in integer registers]"));
2297 if (PIC_FLAG (abfd))
2298 fprintf (file, _(" [position independent]"));
2300 fprintf (file, _(" [absolute position]"));
2303 if (! INTERWORK_SET (abfd))
2304 fprintf (file, _(" [interworking flag not initialised]"));
2305 else if (INTERWORK_FLAG (abfd))
2306 fprintf (file, _(" [interworking supported]"));
2308 fprintf (file, _(" [interworking not supported]"));
2315 /* Copies the given flags into the coff_tdata.flags field.
2316 Typically these flags come from the f_flags[] field of
2317 the COFF filehdr structure, which contains important,
2318 target specific information.
2319 Note: Although this function is static, it is explicitly
2320 called from both coffcode.h and peicode.h. */
2323 _bfd_coff_arm_set_private_flags (abfd, flags)
2329 BFD_ASSERT (abfd != NULL);
2331 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2333 /* Make sure that the APCS field has not been initialised to the opposite
2336 && ( (APCS_26_FLAG (abfd) != flag)
2337 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2338 || (PIC_FLAG (abfd) != (flags & F_PIC))
2342 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2344 SET_APCS_FLAGS (abfd, flag);
2346 flag = (flags & F_INTERWORK);
2348 /* If the BFD has already had its interworking flag set, but it
2349 is different from the value that we have been asked to set,
2350 then assume that that merged code will not support interworking
2351 and set the flag accordingly. */
2352 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2355 /* xgettext: c-format */
2356 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2357 bfd_get_filename (abfd));
2359 /* xgettext: c-format */
2360 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2361 bfd_get_filename (abfd));
2365 SET_INTERWORK_FLAG (abfd, flag);
2370 /* Copy the important parts of the target specific data
2371 from one instance of a BFD to another. */
2374 coff_arm_copy_private_bfd_data (src, dest)
2378 BFD_ASSERT (src != NULL && dest != NULL);
2383 /* If the destination is not in the same format as the source, do not do
2385 if (src->xvec != dest->xvec)
2388 /* copy the flags field */
2391 if (APCS_SET (dest))
2393 /* If the src and dest have different APCS flag bits set, fail. */
2394 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2397 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2400 if (PIC_FLAG (dest) != PIC_FLAG (src))
2404 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2408 if (INTERWORK_SET (src))
2410 if (INTERWORK_SET (dest))
2412 /* If the src and dest have different interworking flags then turn
2413 off the interworking bit. */
2414 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2416 if (INTERWORK_FLAG (dest))
2418 /* xgettext:c-format */
2419 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2420 bfd_get_filename (dest),
2421 bfd_get_filename (src));
2424 SET_INTERWORK_FLAG (dest, 0);
2429 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2436 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2437 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2438 #define LOCAL_LABEL_PREFIX "."
2439 #ifndef USER_LABEL_PREFIX
2440 #define USER_LABEL_PREFIX "_"
2443 /* Like _bfd_coff_is_local_label_name, but
2444 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2446 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2447 labels of the form Lxxx to be stripped. */
2449 coff_arm_is_local_label_name (abfd, name)
2450 bfd * abfd ATTRIBUTE_UNUSED;
2453 #ifdef USER_LABEL_PREFIX
2454 if (USER_LABEL_PREFIX[0] != 0)
2456 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2461 #ifdef LOCAL_LABEL_PREFIX
2462 /* If there is a prefix for local labels then look for this.
2463 If the prefix exists, but it is empty, then ignore the test. */
2465 if (LOCAL_LABEL_PREFIX[0] != 0)
2467 int len = strlen (LOCAL_LABEL_PREFIX);
2469 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2472 /* Perform the checks below for the rest of the name. */
2477 return name[0] == 'L';
2480 /* This piece of machinery exists only to guarantee that the bfd that holds
2481 the glue section is written last.
2483 This does depend on bfd_make_section attaching a new section to the
2484 end of the section list for the bfd.
2489 coff_arm_link_output_has_begun (sub, info)
2491 struct coff_final_link_info * info;
2493 return (sub->output_has_begun
2494 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2498 coff_arm_final_link_postscript (abfd, pfinfo)
2499 bfd * abfd ATTRIBUTE_UNUSED;
2500 struct coff_final_link_info * pfinfo;
2502 struct coff_arm_link_hash_table * globals;
2504 globals = coff_arm_hash_table (pfinfo->info);
2506 BFD_ASSERT (globals != NULL);
2508 if (globals->bfd_of_glue_owner != NULL)
2510 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2513 globals->bfd_of_glue_owner->output_has_begun = true;
2519 #include "coffcode.h"
2521 #ifndef TARGET_LITTLE_SYM
2522 #define TARGET_LITTLE_SYM armcoff_little_vec
2524 #ifndef TARGET_LITTLE_NAME
2525 #define TARGET_LITTLE_NAME "coff-arm-little"
2527 #ifndef TARGET_BIG_SYM
2528 #define TARGET_BIG_SYM armcoff_big_vec
2530 #ifndef TARGET_BIG_NAME
2531 #define TARGET_BIG_NAME "coff-arm-big"
2534 #ifndef TARGET_UNDERSCORE
2535 #define TARGET_UNDERSCORE 0
2539 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2541 #define EXTRA_S_FLAGS 0
2544 /* Forward declaration for use initialising alternative_target field. */
2545 extern const bfd_target TARGET_BIG_SYM ;
2547 /* Target vectors. */
2548 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2549 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)