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_ARM_PCREL_BLX, ARM_26);
849 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
850 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
851 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
852 ASTD (BFD_RELOC_RVA, ARM_RVA32);
853 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
854 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
856 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
858 default: return (CONST struct reloc_howto_struct *) 0;
862 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
863 #define COFF_PAGE_SIZE 0x1000
864 /* Turn a howto into a reloc nunmber */
866 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
867 #define BADMAG(x) ARMBADMAG(x)
868 #define ARM 1 /* Customize coffcode.h */
870 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
871 This allows us to store global data here without actually creating any
872 global variables, which is a no-no in the BFD world. */
873 struct coff_arm_link_hash_table
875 /* The original coff_link_hash_table structure. MUST be first field. */
876 struct coff_link_hash_table root;
878 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
879 long int thumb_glue_size;
881 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
882 long int arm_glue_size;
884 /* An arbitary input BFD chosen to hold the glue sections. */
885 bfd * bfd_of_glue_owner;
887 /* Support interworking with old, non-interworking aware ARM code. */
888 int support_old_code;
891 /* Get the ARM coff linker hash table from a link_info structure. */
892 #define coff_arm_hash_table(info) \
893 ((struct coff_arm_link_hash_table *) ((info)->hash))
895 /* Create an ARM coff linker hash table. */
897 static struct bfd_link_hash_table *
898 coff_arm_link_hash_table_create (abfd)
901 struct coff_arm_link_hash_table * ret;
903 ret = ((struct coff_arm_link_hash_table *)
904 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
905 if (ret == (struct coff_arm_link_hash_table *) NULL)
908 if (! _bfd_coff_link_hash_table_init
909 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
911 bfd_release (abfd, ret);
912 return (struct bfd_link_hash_table *) NULL;
915 ret->thumb_glue_size = 0;
916 ret->arm_glue_size = 0;
917 ret->bfd_of_glue_owner = NULL;
919 return & ret->root.root;
923 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
924 struct bfd_link_info *info;
926 asection *input_section;
927 bfd_vma reloc_offset;
929 bfd_vma addr = reloc_offset
931 + input_section->output_offset
932 + input_section->output_section->vma;
934 if (coff_data(output_bfd)->pe)
935 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
936 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
940 /* The thumb form of a long branch is a bit finicky, because the offset
941 encoding is split over two fields, each in it's own instruction. They
942 can occur in any order. So given a thumb form of long branch, and an
943 offset, insert the offset into the thumb branch and return finished
946 It takes two thumb instructions to encode the target address. Each has
947 11 bits to invest. The upper 11 bits are stored in one (identifed by
948 H-0.. see below), the lower 11 bits are stored in the other (identified
951 Combine together and shifted left by 1 (it's a half word address) and
955 H-0, upper address-0 = 000
957 H-1, lower address-0 = 800
959 They can be ordered either way, but the arm tools I've seen always put
960 the lower one first. It probably doesn't matter. krk@cygnus.com
962 XXX: Actually the order does matter. The second instruction (H-1)
963 moves the computed address into the PC, so it must be the second one
964 in the sequence. The problem, however is that whilst little endian code
965 stores the instructions in HI then LOW order, big endian code does the
966 reverse. nickc@cygnus.com */
968 #define LOW_HI_ORDER 0xF800F000
969 #define HI_LOW_ORDER 0xF000F800
972 insert_thumb_branch (br_insn, rel_off)
976 unsigned int low_bits;
977 unsigned int high_bits;
979 BFD_ASSERT((rel_off & 1) != 1);
981 rel_off >>= 1; /* half word aligned address */
982 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
983 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
985 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
986 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
987 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
988 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
990 abort (); /* error - not a valid branch instruction form */
992 /* FIXME: abort is probably not the right call. krk@cygnus.com */
997 static struct coff_link_hash_entry *
998 find_thumb_glue (info, name, input_bfd)
999 struct bfd_link_info * info;
1004 struct coff_link_hash_entry * myh;
1006 tmp_name = ((char *)
1007 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1009 BFD_ASSERT (tmp_name);
1011 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1013 myh = coff_link_hash_lookup
1014 (coff_hash_table (info), tmp_name, false, false, true);
1017 /* xgettext:c-format */
1018 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1019 bfd_get_filename (input_bfd), tmp_name, name);
1026 static struct coff_link_hash_entry *
1027 find_arm_glue (info, name, input_bfd)
1028 struct bfd_link_info * info;
1033 struct coff_link_hash_entry * myh;
1035 tmp_name = ((char *)
1036 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1038 BFD_ASSERT (tmp_name);
1040 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1042 myh = coff_link_hash_lookup
1043 (coff_hash_table (info), tmp_name, false, false, true);
1046 /* xgettext:c-format */
1047 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1048 bfd_get_filename (input_bfd), tmp_name, name);
1060 ldr r12, __func_addr
1063 .word func @ behave as if you saw a ARM_32 reloc
1066 #define ARM2THUMB_GLUE_SIZE 12
1067 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1068 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1069 static const insn32 a2t3_func_addr_insn = 0x00000001;
1072 Thumb->ARM: Thumb->(non-interworking aware) ARM
1076 __func_from_thumb: __func_from_thumb:
1078 nop ldr r6, __func_addr
1080 __func_change_to_arm: bx r6
1082 __func_back_to_thumb:
1089 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1090 static const insn16 t2a1_bx_pc_insn = 0x4778;
1091 static const insn16 t2a2_noop_insn = 0x46c0;
1092 static const insn32 t2a3_b_insn = 0xea000000;
1094 static const insn16 t2a1_push_insn = 0xb540;
1095 static const insn16 t2a2_ldr_insn = 0x4e03;
1096 static const insn16 t2a3_mov_insn = 0x46fe;
1097 static const insn16 t2a4_bx_insn = 0x4730;
1098 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1099 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1102 We should really create new local (static) symbols in destination
1103 object for each stub we create. We should also create local
1104 (static) symbols within the stubs when switching between ARM and
1105 Thumb code. This will ensure that the debugger and disassembler
1106 can present a better view of stubs.
1108 We can treat stubs like literal sections, and for the THUMB9 ones
1109 (short addressing range) we should be able to insert the stubs
1110 between sections. i.e. the simplest approach (since relocations
1111 are done on a section basis) is to dump the stubs at the end of
1112 processing a section. That way we can always try and minimise the
1113 offset to and from a stub. However, this does not map well onto
1114 the way that the linker/BFD does its work: mapping all input
1115 sections to output sections via the linker script before doing
1118 Unfortunately it may be easier to just to disallow short range
1119 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1120 only branch-and-link (BL) calls. This will simplify the processing
1121 since we can then put all of the stubs into their own section.
1124 On a different subject, rather than complaining when a
1125 branch cannot fit in the number of bits available for the
1126 instruction we should generate a trampoline stub (needed to
1127 address the complete 32bit address space). */
1129 /* The standard COFF backend linker does not cope with the special
1130 Thumb BRANCH23 relocation. The alternative would be to split the
1131 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1132 bit simpler simply providing our own relocation driver. */
1134 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1135 This code is a very slightly modified copy of
1136 _bfd_coff_generic_relocate_section. It would be a much more
1137 maintainable solution to have a MACRO that could be expanded within
1138 _bfd_coff_generic_relocate_section that would only be provided for
1139 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1140 is different from the original. */
1143 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1144 contents, relocs, syms, sections)
1146 struct bfd_link_info *info;
1148 asection *input_section;
1150 struct internal_reloc *relocs;
1151 struct internal_syment *syms;
1152 asection **sections;
1154 struct internal_reloc * rel;
1155 struct internal_reloc * relend;
1158 relend = rel + input_section->reloc_count;
1160 for (; rel < relend; rel++)
1164 struct coff_link_hash_entry * h;
1165 struct internal_syment * sym;
1168 reloc_howto_type * howto;
1169 bfd_reloc_status_type rstat;
1172 symndx = rel->r_symndx;
1181 h = obj_coff_sym_hashes (input_bfd)[symndx];
1182 sym = syms + symndx;
1185 /* COFF treats common symbols in one of two ways. Either the
1186 size of the symbol is included in the section contents, or it
1187 is not. We assume that the size is not included, and force
1188 the rtype_to_howto function to adjust the addend as needed. */
1190 if (sym != NULL && sym->n_scnum != 0)
1191 addend = - sym->n_value;
1195 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1200 /* The relocation_section function will skip pcrel_offset relocs
1201 when doing a relocateable link. However, we want to convert
1202 ARM26 to ARM26D relocs if possible. We return a fake howto in
1203 this case without pcrel_offset set, and adjust the addend to
1205 if (rel->r_type == ARM_26
1207 && info->relocateable
1208 && (h->root.type == bfd_link_hash_defined
1209 || h->root.type == bfd_link_hash_defweak)
1210 && h->root.u.def.section->output_section == input_section->output_section)
1212 static reloc_howto_type fake_arm26_reloc =
1219 complain_overflow_signed,
1220 aoutarm_fix_pcrel_26 ,
1227 addend -= rel->r_vaddr - input_section->vma;
1228 howto = &fake_arm26_reloc;
1232 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1233 the next opcode's pc, so is off by one. */
1234 if (howto->pc_relative && !info->relocateable)
1238 /* If we are doing a relocateable link, then we can just ignore
1239 a PC relative reloc that is pcrel_offset. It will already
1240 have the correct value. If this is not a relocateable link,
1241 then we should ignore the symbol value. */
1242 if (howto->pc_relative && howto->pcrel_offset)
1244 if (info->relocateable)
1246 #if 0 /* We must not ignore the symbol value. If the symbol is
1247 within the same section, the relocation should have already
1248 been fixed, but if it is not, we'll be handed a reloc into
1249 the beginning of the symbol's section, so we must not cancel
1250 out the symbol's value, otherwise we'll be adding it in
1252 if (sym != NULL && sym->n_scnum != 0)
1253 addend += sym->n_value;
1265 sec = bfd_abs_section_ptr;
1270 sec = sections[symndx];
1271 val = (sec->output_section->vma
1272 + sec->output_offset
1279 #if 1 /* THUMBEXTENSION */
1280 /* We don't output the stubs if we are generating a
1281 relocatable output file, since we may as well leave the
1282 stub generation to the final linker pass. If we fail to
1283 verify that the name is defined, we'll try to build stubs
1284 for an undefined name... */
1285 if (! info->relocateable
1286 && ( h->root.type == bfd_link_hash_defined
1287 || h->root.type == bfd_link_hash_defweak))
1289 asection * h_sec = h->root.u.def.section;
1290 const char * name = h->root.root.string;
1292 /* h locates the symbol referenced in the reloc. */
1293 h_val = (h->root.u.def.value
1294 + h_sec->output_section->vma
1295 + h_sec->output_offset);
1297 if (howto->type == ARM_26)
1299 if ( h->class == C_THUMBSTATFUNC
1300 || h->class == C_THUMBEXTFUNC)
1302 /* Arm code calling a Thumb function */
1303 unsigned long int tmp;
1306 long int ret_offset;
1307 struct coff_link_hash_entry * myh;
1308 struct coff_arm_link_hash_table * globals;
1310 myh = find_arm_glue (info, name, input_bfd);
1314 globals = coff_arm_hash_table (info);
1316 BFD_ASSERT (globals != NULL);
1317 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1319 my_offset = myh->root.u.def.value;
1321 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1322 ARM2THUMB_GLUE_SECTION_NAME);
1323 BFD_ASSERT (s != NULL);
1324 BFD_ASSERT (s->contents != NULL);
1325 BFD_ASSERT (s->output_section != NULL);
1327 if ((my_offset & 0x01) == 0x01)
1329 if (h_sec->owner != NULL
1330 && INTERWORK_SET (h_sec->owner)
1331 && ! INTERWORK_FLAG (h_sec->owner))
1334 /* xgettext:c-format */
1335 (_("%s(%s): warning: interworking not enabled."),
1336 bfd_get_filename (h_sec->owner), name);
1338 /* xgettext:c-format */
1339 (_(" first occurrence: %s: arm call to thumb"),
1340 bfd_get_filename (input_bfd));
1344 myh->root.u.def.value = my_offset;
1346 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1347 s->contents + my_offset);
1349 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1350 s->contents + my_offset + 4);
1352 /* It's a thumb address. Add the low order bit. */
1353 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1354 s->contents + my_offset + 8);
1356 if (info->base_file)
1357 arm_emit_base_file_entry (info, output_bfd, s,
1362 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1364 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1365 - input_section->vma);
1367 tmp = tmp & 0xFF000000;
1369 /* Somehow these are both 4 too far, so subtract 8. */
1373 + s->output_section->vma
1374 - (input_section->output_offset
1375 + input_section->output_section->vma
1379 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1381 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1382 - input_section->vma);
1388 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1389 else if (howto->type == ARM_THUMB23)
1391 if ( h->class == C_EXT
1392 || h->class == C_STAT
1393 || h->class == C_LABEL)
1395 /* Thumb code calling an ARM function */
1398 unsigned long int tmp;
1399 long int ret_offset;
1400 struct coff_link_hash_entry * myh;
1401 struct coff_arm_link_hash_table * globals;
1403 myh = find_thumb_glue (info, name, input_bfd);
1407 globals = coff_arm_hash_table (info);
1409 BFD_ASSERT (globals != NULL);
1410 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1412 my_offset = myh->root.u.def.value;
1414 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1415 THUMB2ARM_GLUE_SECTION_NAME);
1417 BFD_ASSERT (s != NULL);
1418 BFD_ASSERT (s->contents != NULL);
1419 BFD_ASSERT (s->output_section != NULL);
1421 if ((my_offset & 0x01) == 0x01)
1423 if (h_sec->owner != NULL
1424 && INTERWORK_SET (h_sec->owner)
1425 && ! INTERWORK_FLAG (h_sec->owner)
1426 && ! globals->support_old_code)
1429 /* xgettext:c-format */
1430 (_("%s(%s): warning: interworking not enabled."),
1431 bfd_get_filename (h_sec->owner), name);
1433 /* xgettext:c-format */
1434 (_(" first occurrence: %s: thumb call to arm"),
1435 bfd_get_filename (input_bfd));
1437 (_(" consider relinking with --support-old-code enabled"));
1441 myh->root.u.def.value = my_offset;
1443 if (globals->support_old_code)
1445 bfd_put_16 (output_bfd, t2a1_push_insn,
1446 s->contents + my_offset);
1448 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1449 s->contents + my_offset + 2);
1451 bfd_put_16 (output_bfd, t2a3_mov_insn,
1452 s->contents + my_offset + 4);
1454 bfd_put_16 (output_bfd, t2a4_bx_insn,
1455 s->contents + my_offset + 6);
1457 bfd_put_32 (output_bfd, t2a5_pop_insn,
1458 s->contents + my_offset + 8);
1460 bfd_put_32 (output_bfd, t2a6_bx_insn,
1461 s->contents + my_offset + 12);
1463 /* Store the address of the function in the last word of the stub. */
1464 bfd_put_32 (output_bfd, h_val,
1465 s->contents + my_offset + 16);
1467 if (info->base_file)
1468 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1472 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1473 s->contents + my_offset);
1475 bfd_put_16 (output_bfd, t2a2_noop_insn,
1476 s->contents + my_offset + 2);
1479 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1481 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1482 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1483 + s->output_section->vma) /* Address of the start of the current section. */
1484 + 4 /* The branch instruction is 4 bytes into the stub. */
1485 + 8); /* ARM branches work from the pc of the instruction + 8. */
1487 bfd_put_32 (output_bfd,
1488 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1489 s->contents + my_offset + 4);
1494 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1496 /* Now go back and fix up the original BL insn to point
1501 - (input_section->output_offset
1505 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1506 - input_section->vma);
1508 bfd_put_32 (output_bfd,
1509 insert_thumb_branch (tmp, ret_offset),
1510 contents + rel->r_vaddr
1511 - input_section->vma);
1519 /* If the relocation type and destination symbol does not
1520 fall into one of the above categories, then we can just
1521 perform a direct link. */
1524 rstat = bfd_reloc_ok;
1526 #endif /* THUMBEXTENSION */
1527 if ( h->root.type == bfd_link_hash_defined
1528 || h->root.type == bfd_link_hash_defweak)
1532 sec = h->root.u.def.section;
1533 val = (h->root.u.def.value
1534 + sec->output_section->vma
1535 + sec->output_offset);
1538 else if (! info->relocateable)
1540 if (! ((*info->callbacks->undefined_symbol)
1541 (info, h->root.root.string, input_bfd, input_section,
1542 rel->r_vaddr - input_section->vma, true)))
1547 if (info->base_file)
1549 /* Emit a reloc if the backend thinks it needs it. */
1550 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1551 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1554 #if 1 /* THUMBEXTENSION */
1556 rstat = bfd_reloc_ok;
1558 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1559 else if (! info->relocateable
1560 && howto->type == ARM_THUMB23)
1562 /* This is pretty much a copy of what the default
1563 _bfd_final_link_relocate and _bfd_relocate_contents
1564 routines do to perform a relocation, with special
1565 processing for the split addressing of the Thumb BL
1566 instruction. Again, it would probably be simpler adding a
1567 ThumbBRANCH23 specific macro expansion into the default
1570 bfd_vma address = rel->r_vaddr - input_section->vma;
1572 if (address > input_section->_raw_size)
1573 rstat = bfd_reloc_outofrange;
1576 bfd_vma relocation = val + addend;
1577 int size = bfd_get_reloc_size (howto);
1578 boolean overflow = false;
1579 bfd_byte * location = contents + address;
1580 bfd_vma x = bfd_get_32 (input_bfd, location);
1581 bfd_vma src_mask = 0x007FFFFE;
1582 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1583 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1585 bfd_signed_vma signed_check;
1587 bfd_signed_vma signed_add;
1589 BFD_ASSERT (size == 4);
1591 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1592 relocation -= (input_section->output_section->vma
1593 + input_section->output_offset);
1595 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1596 relocation -= address;
1598 /* No need to negate the relocation with BRANCH23. */
1599 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1600 /* howto->rightshift == 1 */
1601 /* Drop unwanted bits from the value we are relocating to. */
1603 check = relocation >> howto->rightshift;
1605 /* If this is a signed value, the rightshift just dropped
1606 leading 1 bits (assuming twos complement). */
1607 if ((bfd_signed_vma) relocation >= 0)
1608 signed_check = check;
1610 signed_check = (check
1612 & ~((bfd_vma) - 1 >> howto->rightshift)));
1614 /* Get the value from the object file. */
1615 if (bfd_big_endian (input_bfd))
1617 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1621 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1624 /* Get the value from the object file with an appropriate sign.
1625 The expression involving howto->src_mask isolates the upper
1626 bit of src_mask. If that bit is set in the value we are
1627 adding, it is negative, and we subtract out that number times
1628 two. If src_mask includes the highest possible bit, then we
1629 can not get the upper bit, but that does not matter since
1630 signed_add needs no adjustment to become negative in that
1635 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1636 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1638 /* Add the value from the object file, shifted so that it is a
1640 /* howto->bitpos == 0 */
1642 signed_check += signed_add;
1643 relocation += signed_add;
1645 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1647 /* Assumes two's complement. */
1648 if ( signed_check > reloc_signed_max
1649 || signed_check < reloc_signed_min)
1652 /* Put RELOCATION into the correct bits: */
1654 if (bfd_big_endian (input_bfd))
1656 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1660 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1663 /* Add RELOCATION to the correct bits of X: */
1664 x = ((x & ~howto->dst_mask) | relocation);
1666 /* Put the relocated value back in the object file: */
1667 bfd_put_32 (input_bfd, x, location);
1669 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1674 #endif /* THUMBEXTENSION */
1675 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1677 rel->r_vaddr - input_section->vma,
1679 #if 1 /* THUMBEXTENSION */
1681 Is this the best way to fix up thumb addresses? krk@cygnus.com
1682 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1683 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1684 if (! info->relocateable
1685 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1687 /* Determine if we need to set the bottom bit of a relocated address
1688 because the address is the address of a Thumb code symbol. */
1690 int patchit = false;
1693 && ( h->class == C_THUMBSTATFUNC
1694 || h->class == C_THUMBEXTFUNC))
1698 else if (sym != NULL
1699 && sym->n_scnum > N_UNDEF)
1701 /* No hash entry - use the symbol instead. */
1703 if ( sym->n_sclass == C_THUMBSTATFUNC
1704 || sym->n_sclass == C_THUMBEXTFUNC)
1710 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1711 bfd_vma x = bfd_get_32 (input_bfd, location);
1713 bfd_put_32 (input_bfd, x | 1, location);
1716 #endif /* THUMBEXTENSION */
1724 case bfd_reloc_outofrange:
1725 (*_bfd_error_handler)
1726 (_("%s: bad reloc address 0x%lx in section `%s'"),
1727 bfd_get_filename (input_bfd),
1728 (unsigned long) rel->r_vaddr,
1729 bfd_get_section_name (input_bfd, input_section));
1731 case bfd_reloc_overflow:
1734 char buf[SYMNMLEN + 1];
1739 name = h->root.root.string;
1742 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1747 if (! ((*info->callbacks->reloc_overflow)
1748 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1749 input_section, rel->r_vaddr - input_section->vma)))
1758 #ifndef COFF_IMAGE_WITH_PE
1761 bfd_arm_allocate_interworking_sections (info)
1762 struct bfd_link_info * info;
1766 struct coff_arm_link_hash_table * globals;
1768 static char test_char = '1';
1771 globals = coff_arm_hash_table (info);
1773 BFD_ASSERT (globals != NULL);
1775 if (globals->arm_glue_size != 0)
1777 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1779 s = bfd_get_section_by_name
1780 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1782 BFD_ASSERT (s != NULL);
1784 foo = (bfd_byte *) bfd_alloc
1785 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1787 memset (foo, test_char, globals->arm_glue_size);
1790 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1794 if (globals->thumb_glue_size != 0)
1796 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1798 s = bfd_get_section_by_name
1799 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1801 BFD_ASSERT (s != NULL);
1803 foo = (bfd_byte *) bfd_alloc
1804 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1806 memset (foo, test_char, globals->thumb_glue_size);
1809 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1817 record_arm_to_thumb_glue (info, h)
1818 struct bfd_link_info * info;
1819 struct coff_link_hash_entry * h;
1821 const char * name = h->root.root.string;
1822 register asection * s;
1824 struct coff_link_hash_entry * myh;
1825 struct coff_arm_link_hash_table * globals;
1827 globals = coff_arm_hash_table (info);
1829 BFD_ASSERT (globals != NULL);
1830 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1832 s = bfd_get_section_by_name
1833 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1835 BFD_ASSERT (s != NULL);
1837 tmp_name = ((char *)
1838 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1840 BFD_ASSERT (tmp_name);
1842 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1844 myh = coff_link_hash_lookup
1845 (coff_hash_table (info), tmp_name, false, false, true);
1850 return; /* we've already seen this guy */
1853 /* The only trick here is using globals->arm_glue_size as the value. Even
1854 though the section isn't allocated yet, this is where we will be putting
1857 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1859 s, globals->arm_glue_size + 1,
1861 (struct bfd_link_hash_entry **) & myh);
1865 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1871 record_thumb_to_arm_glue (info, h)
1872 struct bfd_link_info * info;
1873 struct coff_link_hash_entry * h;
1875 const char * name = h->root.root.string;
1876 register asection * s;
1878 struct coff_link_hash_entry * myh;
1879 struct coff_arm_link_hash_table * globals;
1881 globals = coff_arm_hash_table (info);
1883 BFD_ASSERT (globals != NULL);
1884 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1886 s = bfd_get_section_by_name
1887 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1889 BFD_ASSERT (s != NULL);
1891 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1893 BFD_ASSERT (tmp_name);
1895 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1897 myh = coff_link_hash_lookup
1898 (coff_hash_table (info), tmp_name, false, false, true);
1903 return; /* we've already seen this guy */
1906 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1907 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1909 (struct bfd_link_hash_entry **) & myh);
1911 /* If we mark it 'thumb', the disassembler will do a better job. */
1912 myh->class = C_THUMBEXTFUNC;
1916 /* Allocate another symbol to mark where we switch to arm mode. */
1918 #define CHANGE_TO_ARM "__%s_change_to_arm"
1919 #define BACK_FROM_ARM "__%s_back_from_arm"
1921 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1923 BFD_ASSERT (tmp_name);
1925 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1929 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1930 BSF_LOCAL, s, globals->thumb_glue_size
1931 + (globals->support_old_code ? 8 : 4),
1933 (struct bfd_link_hash_entry **) & myh);
1937 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1942 /* Select a BFD to be used to hold the sections used by the glue code.
1943 This function is called from the linker scripts in ld/emultempl/
1947 bfd_arm_get_bfd_for_interworking (abfd, info)
1949 struct bfd_link_info * info;
1951 struct coff_arm_link_hash_table * globals;
1955 /* If we are only performing a partial link do not bother
1956 getting a bfd to hold the glue. */
1957 if (info->relocateable)
1960 globals = coff_arm_hash_table (info);
1962 BFD_ASSERT (globals != NULL);
1964 if (globals->bfd_of_glue_owner != NULL)
1967 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1971 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1973 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1976 || ! bfd_set_section_flags (abfd, sec, flags)
1977 || ! bfd_set_section_alignment (abfd, sec, 2))
1981 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1985 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1987 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1990 || ! bfd_set_section_flags (abfd, sec, flags)
1991 || ! bfd_set_section_alignment (abfd, sec, 2))
1995 /* Save the bfd for later use. */
1996 globals->bfd_of_glue_owner = abfd;
2002 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2004 struct bfd_link_info * info;
2005 int support_old_code;
2008 struct coff_arm_link_hash_table * globals;
2010 /* If we are only performing a partial link do not bother
2011 to construct any glue. */
2012 if (info->relocateable)
2015 /* Here we have a bfd that is to be included on the link. We have a hook
2016 to do reloc rummaging, before section sizes are nailed down. */
2018 _bfd_coff_get_external_symbols (abfd);
2020 globals = coff_arm_hash_table (info);
2022 BFD_ASSERT (globals != NULL);
2023 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2025 globals->support_old_code = support_old_code;
2027 /* Rummage around all the relocs and map the glue vectors. */
2028 sec = abfd->sections;
2033 for (; sec != NULL; sec = sec->next)
2035 struct internal_reloc * i;
2036 struct internal_reloc * rel;
2038 if (sec->reloc_count == 0)
2041 /* Load the relocs. */
2042 /* FIXME: there may be a storage leak here. */
2044 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2046 BFD_ASSERT (i != 0);
2048 for (rel = i; rel < i + sec->reloc_count; ++rel)
2050 unsigned short r_type = rel->r_type;
2052 struct coff_link_hash_entry * h;
2054 symndx = rel->r_symndx;
2056 /* If the relocation is not against a symbol it cannot concern us. */
2060 /* If the index is outside of the range of our table, something has gone wrong. */
2061 if (symndx >= obj_conv_table_size (abfd))
2063 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2064 bfd_get_filename (abfd), symndx);
2068 h = obj_coff_sym_hashes (abfd)[symndx];
2070 /* If the relocation is against a static symbol it must be within
2071 the current section and so cannot be a cross ARM/Thumb relocation. */
2078 /* This one is a call from arm code. We need to look up
2079 the target of the call. If it is a thumb target, we
2082 if (h->class == C_THUMBEXTFUNC)
2083 record_arm_to_thumb_glue (info, h);
2088 /* This one is a call from thumb code. We used to look
2089 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2090 up the target of the call. If it is an arm target, we
2091 insert glue. If the symbol does not exist it will be
2092 given a class of C_EXT and so we will generate a stub
2093 for it. This is not really a problem, since the link
2094 is doomed anyway. */
2101 record_thumb_to_arm_glue (info, h);
2118 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2120 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2121 #define coff_relocate_section coff_arm_relocate_section
2122 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2123 #define coff_adjust_symndx coff_arm_adjust_symndx
2124 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2125 #define coff_final_link_postscript coff_arm_final_link_postscript
2126 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2127 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2128 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2129 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2130 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2132 /* When doing a relocateable link, we want to convert ARM26 relocs
2133 into ARM26D relocs. */
2136 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2137 bfd *obfd ATTRIBUTE_UNUSED;
2138 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2141 struct internal_reloc *irel;
2144 if (irel->r_type == 3)
2146 struct coff_link_hash_entry *h;
2148 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2150 && (h->root.type == bfd_link_hash_defined
2151 || h->root.type == bfd_link_hash_defweak)
2152 && h->root.u.def.section->output_section == sec->output_section)
2159 /* Called when merging the private data areas of two BFDs.
2160 This is important as it allows us to detect if we are
2161 attempting to merge binaries compiled for different ARM
2162 targets, eg different CPUs or differents APCS's. */
2165 coff_arm_merge_private_bfd_data (ibfd, obfd)
2169 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2174 /* If the two formats are different we cannot merge anything.
2175 This is not an error, since it is permissable to change the
2176 input and output formats. */
2177 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2178 || obfd->xvec->flavour != bfd_target_coff_flavour)
2181 /* Verify that the APCS is the same for the two BFDs */
2182 if (APCS_SET (ibfd))
2184 if (APCS_SET (obfd))
2186 /* If the src and dest have different APCS flag bits set, fail. */
2187 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2190 /* xgettext: c-format */
2191 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2192 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2193 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2196 bfd_set_error (bfd_error_wrong_format);
2200 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2204 if (APCS_FLOAT_FLAG (ibfd))
2205 /* xgettext: c-format */
2206 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2208 /* xgettext: c-format */
2209 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2211 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2212 bfd_get_filename (obfd));
2214 bfd_set_error (bfd_error_wrong_format);
2218 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2222 if (PIC_FLAG (ibfd))
2223 /* xgettext: c-format */
2224 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2226 /* xgettext: c-format */
2227 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2228 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2229 bfd_get_filename (obfd));
2231 bfd_set_error (bfd_error_wrong_format);
2237 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2239 /* Set up the arch and fields as well as these are probably wrong. */
2240 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2244 /* Check the interworking support. */
2245 if (INTERWORK_SET (ibfd))
2247 if (INTERWORK_SET (obfd))
2249 /* If the src and dest differ in their interworking issue a warning. */
2250 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2254 if (INTERWORK_FLAG (ibfd))
2255 /* xgettext: c-format */
2256 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2258 /* xgettext: c-format */
2259 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2261 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2262 bfd_get_filename (obfd));
2267 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2274 /* Display the flags field. */
2277 coff_arm_print_private_bfd_data (abfd, ptr)
2281 FILE * file = (FILE *) ptr;
2283 BFD_ASSERT (abfd != NULL && ptr != NULL);
2285 /* xgettext:c-format */
2286 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2288 if (APCS_SET (abfd))
2290 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2291 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2293 if (APCS_FLOAT_FLAG (abfd))
2294 fprintf (file, _(" [floats passed in float registers]"));
2296 fprintf (file, _(" [floats passed in integer registers]"));
2298 if (PIC_FLAG (abfd))
2299 fprintf (file, _(" [position independent]"));
2301 fprintf (file, _(" [absolute position]"));
2304 if (! INTERWORK_SET (abfd))
2305 fprintf (file, _(" [interworking flag not initialised]"));
2306 else if (INTERWORK_FLAG (abfd))
2307 fprintf (file, _(" [interworking supported]"));
2309 fprintf (file, _(" [interworking not supported]"));
2316 /* Copies the given flags into the coff_tdata.flags field.
2317 Typically these flags come from the f_flags[] field of
2318 the COFF filehdr structure, which contains important,
2319 target specific information.
2320 Note: Although this function is static, it is explicitly
2321 called from both coffcode.h and peicode.h. */
2324 _bfd_coff_arm_set_private_flags (abfd, flags)
2330 BFD_ASSERT (abfd != NULL);
2332 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2334 /* Make sure that the APCS field has not been initialised to the opposite
2337 && ( (APCS_26_FLAG (abfd) != flag)
2338 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2339 || (PIC_FLAG (abfd) != (flags & F_PIC))
2343 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2345 SET_APCS_FLAGS (abfd, flag);
2347 flag = (flags & F_INTERWORK);
2349 /* If the BFD has already had its interworking flag set, but it
2350 is different from the value that we have been asked to set,
2351 then assume that that merged code will not support interworking
2352 and set the flag accordingly. */
2353 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2356 /* xgettext: c-format */
2357 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2358 bfd_get_filename (abfd));
2360 /* xgettext: c-format */
2361 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2362 bfd_get_filename (abfd));
2366 SET_INTERWORK_FLAG (abfd, flag);
2371 /* Copy the important parts of the target specific data
2372 from one instance of a BFD to another. */
2375 coff_arm_copy_private_bfd_data (src, dest)
2379 BFD_ASSERT (src != NULL && dest != NULL);
2384 /* If the destination is not in the same format as the source, do not do
2386 if (src->xvec != dest->xvec)
2389 /* copy the flags field */
2392 if (APCS_SET (dest))
2394 /* If the src and dest have different APCS flag bits set, fail. */
2395 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2398 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2401 if (PIC_FLAG (dest) != PIC_FLAG (src))
2405 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2409 if (INTERWORK_SET (src))
2411 if (INTERWORK_SET (dest))
2413 /* If the src and dest have different interworking flags then turn
2414 off the interworking bit. */
2415 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2417 if (INTERWORK_FLAG (dest))
2419 /* xgettext:c-format */
2420 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2421 bfd_get_filename (dest),
2422 bfd_get_filename (src));
2425 SET_INTERWORK_FLAG (dest, 0);
2430 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2437 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2438 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2439 #define LOCAL_LABEL_PREFIX ""
2440 #ifndef USER_LABEL_PREFIX
2441 #define USER_LABEL_PREFIX "_"
2444 /* Like _bfd_coff_is_local_label_name, but
2445 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2447 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2448 labels of the form Lxxx to be stripped. */
2450 coff_arm_is_local_label_name (abfd, name)
2451 bfd * abfd ATTRIBUTE_UNUSED;
2454 #ifdef USER_LABEL_PREFIX
2455 if (USER_LABEL_PREFIX[0] != 0)
2457 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2462 #ifdef LOCAL_LABEL_PREFIX
2463 /* If there is a prefix for local labels then look for this.
2464 If the prefix exists, but it is empty, then ignore the test. */
2466 if (LOCAL_LABEL_PREFIX[0] != 0)
2468 int len = strlen (LOCAL_LABEL_PREFIX);
2470 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2473 /* Perform the checks below for the rest of the name. */
2478 return name[0] == 'L';
2481 /* This piece of machinery exists only to guarantee that the bfd that holds
2482 the glue section is written last.
2484 This does depend on bfd_make_section attaching a new section to the
2485 end of the section list for the bfd.
2490 coff_arm_link_output_has_begun (sub, info)
2492 struct coff_final_link_info * info;
2494 return (sub->output_has_begun
2495 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2499 coff_arm_final_link_postscript (abfd, pfinfo)
2500 bfd * abfd ATTRIBUTE_UNUSED;
2501 struct coff_final_link_info * pfinfo;
2503 struct coff_arm_link_hash_table * globals;
2505 globals = coff_arm_hash_table (pfinfo->info);
2507 BFD_ASSERT (globals != NULL);
2509 if (globals->bfd_of_glue_owner != NULL)
2511 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2514 globals->bfd_of_glue_owner->output_has_begun = true;
2520 #include "coffcode.h"
2522 #ifndef TARGET_LITTLE_SYM
2523 #define TARGET_LITTLE_SYM armcoff_little_vec
2525 #ifndef TARGET_LITTLE_NAME
2526 #define TARGET_LITTLE_NAME "coff-arm-little"
2528 #ifndef TARGET_BIG_SYM
2529 #define TARGET_BIG_SYM armcoff_big_vec
2531 #ifndef TARGET_BIG_NAME
2532 #define TARGET_BIG_NAME "coff-arm-big"
2535 #ifndef TARGET_UNDERSCORE
2536 #define TARGET_UNDERSCORE 0
2539 #ifndef EXTRA_S_FLAGS
2541 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2543 #define EXTRA_S_FLAGS 0
2547 /* Forward declaration for use initialising alternative_target field. */
2548 extern const bfd_target TARGET_BIG_SYM ;
2550 /* Target vectors. */
2551 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2552 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)