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;
61 /* Forward declarations for stupid compilers. */
62 static boolean coff_arm_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 struct internal_reloc *, struct internal_syment *, asection **));
65 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type aoutarm_fix_pcrel_26
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_23
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_thumb_pcrel_12
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static bfd_reloc_status_type coff_thumb_pcrel_9
74 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
75 static bfd_reloc_status_type coff_arm_reloc
76 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
77 static boolean coff_arm_adjust_symndx
78 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
79 asection *, struct internal_reloc *, boolean *));
80 static reloc_howto_type * coff_arm_rtype_to_howto
81 PARAMS ((bfd *, asection *, struct internal_reloc *,
82 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
83 static bfd_reloc_status_type coff_thumb_pcrel_common
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
85 thumb_pcrel_branchtype));
86 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
87 PARAMS ((bfd *, bfd_reloc_code_real_type));
88 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
90 static insn32 insert_thumb_branch
91 PARAMS ((insn32, int));
92 static struct coff_link_hash_entry * find_thumb_glue
93 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
94 static struct coff_link_hash_entry * find_arm_glue
95 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
96 #ifndef COFF_IMAGE_WITH_PE
97 static void record_arm_to_thumb_glue
98 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
99 static void record_thumb_to_arm_glue
100 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
102 static boolean coff_arm_merge_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_print_private_bfd_data
105 PARAMS ((bfd *, PTR));
106 static boolean _bfd_coff_arm_set_private_flags
107 PARAMS ((bfd *, flagword));
108 static boolean coff_arm_copy_private_bfd_data
109 PARAMS ((bfd *, bfd *));
110 static boolean coff_arm_is_local_label_name
111 PARAMS ((bfd *, const char *));
112 static boolean coff_arm_link_output_has_begun
113 PARAMS ((bfd *, struct coff_final_link_info *));
114 static boolean coff_arm_final_link_postscript
115 PARAMS ((bfd *, struct coff_final_link_info *));
117 /* The linker script knows the section names for placement.
118 The entry_names are used to do simple name mangling on the stubs.
119 Given a function name, and its type, the stub can be found. The
120 name can be changed. The only requirement is the %s be present.
123 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
124 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
126 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
127 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
129 /* Used by the assembler. */
130 static bfd_reloc_status_type
131 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
134 arelent *reloc_entry;
135 asymbol *symbol ATTRIBUTE_UNUSED;
137 asection *input_section ATTRIBUTE_UNUSED;
139 char **error_message ATTRIBUTE_UNUSED;
142 if (output_bfd == (bfd *) NULL)
143 return bfd_reloc_continue;
145 diff = reloc_entry->addend;
148 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
152 reloc_howto_type *howto = reloc_entry->howto;
153 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
159 char x = bfd_get_8 (abfd, addr);
161 bfd_put_8 (abfd, x, addr);
167 short x = bfd_get_16 (abfd, addr);
169 bfd_put_16 (abfd, x, addr);
175 long x = bfd_get_32 (abfd, addr);
177 bfd_put_32 (abfd, x, addr);
186 /* Now let bfd_perform_relocation finish everything up. */
187 return bfd_reloc_continue;
190 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
191 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
193 #ifndef TARGET_UNDERSCORE
194 #define TARGET_UNDERSCORE '_'
198 #define PCRELOFFSET true
201 /* These most certainly belong somewhere else. Just had to get rid of
202 the manifest constants in the code. */
215 #define ARM_THUMB9 12
216 #define ARM_THUMB12 13
217 #define ARM_THUMB23 14
229 #define ARM_THUMB12 4
231 #define ARM_SECTION 14
232 #define ARM_SECREL 15
235 static reloc_howto_type aoutarm_std_reloc_howto[] =
237 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
246 complain_overflow_bitfield,
259 complain_overflow_bitfield,
272 complain_overflow_signed,
273 aoutarm_fix_pcrel_26 ,
285 complain_overflow_signed,
286 coff_thumb_pcrel_12 ,
298 complain_overflow_dont,
299 aoutarm_fix_pcrel_26_done,
319 complain_overflow_bitfield,
332 complain_overflow_bitfield,
339 #else /* not ARM_WINCE */
340 HOWTO(ARM_8, /* type */
344 false, /* pc_relative */
346 complain_overflow_bitfield, /* complain_on_overflow */
347 coff_arm_reloc, /* special_function */
349 true, /* partial_inplace */
350 0x000000ff, /* src_mask */
351 0x000000ff, /* dst_mask */
352 PCRELOFFSET /* pcrel_offset */),
359 complain_overflow_bitfield,
372 complain_overflow_bitfield,
385 complain_overflow_signed,
386 aoutarm_fix_pcrel_26 ,
398 complain_overflow_signed,
411 complain_overflow_signed,
424 complain_overflow_signed,
437 complain_overflow_dont,
438 aoutarm_fix_pcrel_26_done,
452 complain_overflow_bitfield,
465 complain_overflow_bitfield,
478 complain_overflow_bitfield,
491 complain_overflow_signed,
504 complain_overflow_signed,
505 coff_thumb_pcrel_12 ,
517 complain_overflow_signed,
518 coff_thumb_pcrel_23 ,
524 #endif /* not ARM_WINCE */
527 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
530 /* Return true if this relocation should
531 appear in the output .reloc section. */
534 in_reloc_p (abfd, howto)
535 bfd * abfd ATTRIBUTE_UNUSED;
536 reloc_howto_type * howto;
538 return !howto->pc_relative && howto->type != ARM_RVA32;
542 #define RTYPE2HOWTO(cache_ptr, dst) \
543 (cache_ptr)->howto = \
544 (dst)->r_type < NUM_RELOCS \
545 ? aoutarm_std_reloc_howto + (dst)->r_type \
548 #define coff_rtype_to_howto coff_arm_rtype_to_howto
550 static reloc_howto_type *
551 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
552 bfd *abfd ATTRIBUTE_UNUSED;
554 struct internal_reloc *rel;
555 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
556 struct internal_syment *sym ATTRIBUTE_UNUSED;
559 reloc_howto_type * howto;
561 if (rel->r_type >= NUM_RELOCS)
564 howto = aoutarm_std_reloc_howto + rel->r_type;
566 if (rel->r_type == ARM_RVA32)
567 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
571 /* Used by the assembler. */
573 static bfd_reloc_status_type
574 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
575 output_bfd, error_message)
576 bfd *abfd ATTRIBUTE_UNUSED;
577 arelent *reloc_entry ATTRIBUTE_UNUSED;
578 asymbol *symbol ATTRIBUTE_UNUSED;
579 PTR data ATTRIBUTE_UNUSED;
580 asection *input_section ATTRIBUTE_UNUSED;
581 bfd *output_bfd ATTRIBUTE_UNUSED;
582 char **error_message ATTRIBUTE_UNUSED;
584 /* This is dead simple at present. */
588 /* Used by the assembler. */
590 static bfd_reloc_status_type
591 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
592 output_bfd, error_message)
594 arelent *reloc_entry;
597 asection *input_section;
599 char **error_message ATTRIBUTE_UNUSED;
602 bfd_size_type addr = reloc_entry->address;
603 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
604 bfd_reloc_status_type flag = bfd_reloc_ok;
606 /* If this is an undefined symbol, return error */
607 if (symbol->section == &bfd_und_section
608 && (symbol->flags & BSF_WEAK) == 0)
609 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
611 /* If the sections are different, and we are doing a partial relocation,
612 just ignore it for now. */
613 if (symbol->section->name != input_section->name
614 && output_bfd != (bfd *)NULL)
615 return bfd_reloc_continue;
617 relocation = (target & 0x00ffffff) << 2;
618 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
619 relocation += symbol->value;
620 relocation += symbol->section->output_section->vma;
621 relocation += symbol->section->output_offset;
622 relocation += reloc_entry->addend;
623 relocation -= input_section->output_section->vma;
624 relocation -= input_section->output_offset;
628 return bfd_reloc_overflow;
630 /* Check for overflow */
631 if (relocation & 0x02000000)
633 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
634 flag = bfd_reloc_overflow;
636 else if (relocation & ~0x03ffffff)
637 flag = bfd_reloc_overflow;
639 target &= ~0x00ffffff;
640 target |= (relocation >> 2) & 0x00ffffff;
641 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
643 /* Now the ARM magic... Change the reloc type so that it is marked as done.
644 Strictly this is only necessary if we are doing a partial relocation. */
645 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
650 static bfd_reloc_status_type
651 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
652 output_bfd, error_message, btype)
654 arelent *reloc_entry;
657 asection *input_section;
659 char **error_message ATTRIBUTE_UNUSED;
660 thumb_pcrel_branchtype btype;
662 bfd_vma relocation = 0;
663 bfd_size_type addr = reloc_entry->address;
664 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
665 bfd_reloc_status_type flag = bfd_reloc_ok;
670 /* NOTE: This routine is currently used by GAS, but not by the link
678 signbit = 0x00000100;
684 signbit = 0x00000800;
690 signbit = 0x00400000;
697 /* If this is an undefined symbol, return error */
698 if (symbol->section == &bfd_und_section
699 && (symbol->flags & BSF_WEAK) == 0)
700 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
702 /* If the sections are different, and we are doing a partial relocation,
703 just ignore it for now. */
704 if (symbol->section->name != input_section->name
705 && output_bfd != (bfd *)NULL)
706 return bfd_reloc_continue;
712 relocation = ((target & dstmsk) << 1);
716 if (bfd_big_endian (abfd))
717 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
719 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
726 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
727 relocation += symbol->value;
728 relocation += symbol->section->output_section->vma;
729 relocation += symbol->section->output_offset;
730 relocation += reloc_entry->addend;
731 relocation -= input_section->output_section->vma;
732 relocation -= input_section->output_offset;
736 return bfd_reloc_overflow;
738 /* Check for overflow */
739 if (relocation & signbit)
741 if ((relocation & ~offmsk) != ~offmsk)
742 flag = bfd_reloc_overflow;
744 else if (relocation & ~offmsk)
745 flag = bfd_reloc_overflow;
752 target |= (relocation >> 1);
756 if (bfd_big_endian (abfd))
757 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
759 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
766 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
768 /* Now the ARM magic... Change the reloc type so that it is marked as done.
769 Strictly this is only necessary if we are doing a partial relocation. */
770 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
772 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
776 static bfd_reloc_status_type
777 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
778 output_bfd, error_message)
780 arelent *reloc_entry;
783 asection *input_section;
785 char **error_message;
787 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
788 input_section, output_bfd, error_message, b23);
791 static bfd_reloc_status_type
792 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
793 output_bfd, error_message)
795 arelent *reloc_entry;
798 asection *input_section;
800 char **error_message;
802 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
803 input_section, output_bfd, error_message, b12);
806 static bfd_reloc_status_type
807 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
808 output_bfd, error_message)
810 arelent *reloc_entry;
813 asection *input_section;
815 char **error_message;
817 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
818 input_section, output_bfd, error_message, b9);
822 static CONST struct reloc_howto_struct *
823 coff_arm_reloc_type_lookup (abfd, code)
825 bfd_reloc_code_real_type code;
827 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
829 if (code == BFD_RELOC_CTOR)
830 switch (bfd_get_arch_info (abfd)->bits_per_address)
835 default: return (CONST struct reloc_howto_struct *) 0;
841 ASTD (BFD_RELOC_32, ARM_32);
842 ASTD (BFD_RELOC_RVA, ARM_RVA32);
843 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
844 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
846 ASTD (BFD_RELOC_8, ARM_8);
847 ASTD (BFD_RELOC_16, ARM_16);
848 ASTD (BFD_RELOC_32, ARM_32);
849 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
850 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
851 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
852 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
853 ASTD (BFD_RELOC_RVA, ARM_RVA32);
854 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
855 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
856 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
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;
980 BFD_ASSERT((rel_off & 1) != 1);
982 rel_off >>= 1; /* half word aligned address */
983 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
984 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
986 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
987 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
988 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
989 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
991 abort(); /* error - not a valid branch instruction form */
993 /* FIXME: abort is probably not the right call. krk@cygnus.com */
999 static struct coff_link_hash_entry *
1000 find_thumb_glue (info, name, input_bfd)
1001 struct bfd_link_info * info;
1006 struct coff_link_hash_entry * myh;
1008 tmp_name = ((char *)
1009 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1011 BFD_ASSERT (tmp_name);
1013 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1015 myh = coff_link_hash_lookup
1016 (coff_hash_table (info), tmp_name, false, false, true);
1019 /* xgettext:c-format */
1020 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1021 bfd_get_filename (input_bfd), tmp_name, name);
1028 static struct coff_link_hash_entry *
1029 find_arm_glue (info, name, input_bfd)
1030 struct bfd_link_info * info;
1035 struct coff_link_hash_entry * myh;
1037 tmp_name = ((char *)
1038 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1040 BFD_ASSERT (tmp_name);
1042 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1044 myh = coff_link_hash_lookup
1045 (coff_hash_table (info), tmp_name, false, false, true);
1048 /* xgettext:c-format */
1049 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1050 bfd_get_filename (input_bfd), tmp_name, name);
1062 ldr r12, __func_addr
1065 .word func @ behave as if you saw a ARM_32 reloc
1068 #define ARM2THUMB_GLUE_SIZE 12
1069 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1070 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1071 static const insn32 a2t3_func_addr_insn = 0x00000001;
1074 Thumb->ARM: Thumb->(non-interworking aware) ARM
1078 __func_from_thumb: __func_from_thumb:
1080 nop ldr r6, __func_addr
1082 __func_change_to_arm: bx r6
1084 __func_back_to_thumb:
1091 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1092 static const insn16 t2a1_bx_pc_insn = 0x4778;
1093 static const insn16 t2a2_noop_insn = 0x46c0;
1094 static const insn32 t2a3_b_insn = 0xea000000;
1096 static const insn16 t2a1_push_insn = 0xb540;
1097 static const insn16 t2a2_ldr_insn = 0x4e03;
1098 static const insn16 t2a3_mov_insn = 0x46fe;
1099 static const insn16 t2a4_bx_insn = 0x4730;
1100 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1101 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1104 We should really create new local (static) symbols in destination
1105 object for each stub we create. We should also create local
1106 (static) symbols within the stubs when switching between ARM and
1107 Thumb code. This will ensure that the debugger and disassembler
1108 can present a better view of stubs.
1110 We can treat stubs like literal sections, and for the THUMB9 ones
1111 (short addressing range) we should be able to insert the stubs
1112 between sections. i.e. the simplest approach (since relocations
1113 are done on a section basis) is to dump the stubs at the end of
1114 processing a section. That way we can always try and minimise the
1115 offset to and from a stub. However, this does not map well onto
1116 the way that the linker/BFD does its work: mapping all input
1117 sections to output sections via the linker script before doing
1120 Unfortunately it may be easier to just to disallow short range
1121 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1122 only branch-and-link (BL) calls. This will simplify the processing
1123 since we can then put all of the stubs into their own section.
1126 On a different subject, rather than complaining when a
1127 branch cannot fit in the number of bits available for the
1128 instruction we should generate a trampoline stub (needed to
1129 address the complete 32bit address space). */
1131 /* The standard COFF backend linker does not cope with the special
1132 Thumb BRANCH23 relocation. The alternative would be to split the
1133 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1134 bit simpler simply providing our own relocation driver. */
1136 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1137 This code is a very slightly modified copy of
1138 _bfd_coff_generic_relocate_section. It would be a much more
1139 maintainable solution to have a MACRO that could be expanded within
1140 _bfd_coff_generic_relocate_section that would only be provided for
1141 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1142 is different from the original. */
1145 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1146 contents, relocs, syms, sections)
1148 struct bfd_link_info *info;
1150 asection *input_section;
1152 struct internal_reloc *relocs;
1153 struct internal_syment *syms;
1154 asection **sections;
1156 struct internal_reloc * rel;
1157 struct internal_reloc * relend;
1160 relend = rel + input_section->reloc_count;
1162 for (; rel < relend; rel++)
1166 struct coff_link_hash_entry * h;
1167 struct internal_syment * sym;
1170 reloc_howto_type * howto;
1171 bfd_reloc_status_type rstat;
1174 symndx = rel->r_symndx;
1183 h = obj_coff_sym_hashes (input_bfd)[symndx];
1184 sym = syms + symndx;
1187 /* COFF treats common symbols in one of two ways. Either the
1188 size of the symbol is included in the section contents, or it
1189 is not. We assume that the size is not included, and force
1190 the rtype_to_howto function to adjust the addend as needed. */
1192 if (sym != NULL && sym->n_scnum != 0)
1193 addend = - sym->n_value;
1198 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1203 /* The relocation_section function will skip pcrel_offset relocs
1204 when doing a relocateable link. However, we want to convert
1205 ARM26 to ARM26D relocs if possible. We return a fake howto in
1206 this case without pcrel_offset set, and adjust the addend to
1208 if (rel->r_type == ARM_26
1210 && info->relocateable
1211 && (h->root.type == bfd_link_hash_defined
1212 || h->root.type == bfd_link_hash_defweak)
1213 && h->root.u.def.section->output_section == input_section->output_section)
1215 static reloc_howto_type fake_arm26_reloc =
1222 complain_overflow_signed,
1223 aoutarm_fix_pcrel_26 ,
1230 addend -= rel->r_vaddr - input_section->vma;
1231 howto = &fake_arm26_reloc;
1235 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1236 the next opcode's pc, so is off by one. */
1237 if (howto->pc_relative && !info->relocateable)
1241 /* If we are doing a relocateable link, then we can just ignore
1242 a PC relative reloc that is pcrel_offset. It will already
1243 have the correct value. If this is not a relocateable link,
1244 then we should ignore the symbol value. */
1245 if (howto->pc_relative && howto->pcrel_offset)
1247 if (info->relocateable)
1249 if (sym != NULL && sym->n_scnum != 0)
1250 addend += sym->n_value;
1261 sec = bfd_abs_section_ptr;
1266 sec = sections[symndx];
1267 val = (sec->output_section->vma
1268 + sec->output_offset
1275 #if 1 /* THUMBEXTENSION */
1276 /* We don't output the stubs if we are generating a
1277 relocatable output file, since we may as well leave the
1278 stub generation to the final linker pass. If we fail to
1279 verify that the name is defined, we'll try to build stubs
1280 for an undefined name... */
1281 if (! info->relocateable
1282 && ( h->root.type == bfd_link_hash_defined
1283 || h->root.type == bfd_link_hash_defweak))
1285 asection * h_sec = h->root.u.def.section;
1286 const char * name = h->root.root.string;
1288 /* h locates the symbol referenced in the reloc. */
1289 h_val = (h->root.u.def.value
1290 + h_sec->output_section->vma
1291 + h_sec->output_offset);
1293 if (howto->type == ARM_26)
1295 if ( h->class == C_THUMBSTATFUNC
1296 || h->class == C_THUMBEXTFUNC)
1298 /* Arm code calling a Thumb function */
1299 unsigned long int tmp;
1302 long int ret_offset;
1303 struct coff_link_hash_entry * myh;
1304 struct coff_arm_link_hash_table * globals;
1306 myh = find_arm_glue (info, name, input_bfd);
1310 globals = coff_arm_hash_table (info);
1312 BFD_ASSERT (globals != NULL);
1313 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1315 my_offset = myh->root.u.def.value;
1317 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1318 ARM2THUMB_GLUE_SECTION_NAME);
1319 BFD_ASSERT (s != NULL);
1320 BFD_ASSERT (s->contents != NULL);
1321 BFD_ASSERT (s->output_section != NULL);
1323 if ((my_offset & 0x01) == 0x01)
1325 if (h_sec->owner != NULL
1326 && INTERWORK_SET (h_sec->owner)
1327 && ! INTERWORK_FLAG (h_sec->owner))
1330 /* xgettext:c-format */
1331 (_("%s(%s): warning: interworking not enabled."),
1332 bfd_get_filename (h_sec->owner), name);
1334 /* xgettext:c-format */
1335 (_(" first occurrence: %s: arm call to thumb"),
1336 bfd_get_filename (input_bfd));
1340 myh->root.u.def.value = my_offset;
1342 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1343 s->contents + my_offset);
1345 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1346 s->contents + my_offset + 4);
1348 /* It's a thumb address. Add the low order bit. */
1349 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1350 s->contents + my_offset + 8);
1352 if (info->base_file)
1353 arm_emit_base_file_entry (info, output_bfd, s,
1358 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1360 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1361 - input_section->vma);
1363 tmp = tmp & 0xFF000000;
1365 /* Somehow these are both 4 too far, so subtract 8. */
1369 + s->output_section->vma
1370 - (input_section->output_offset
1371 + input_section->output_section->vma
1375 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1377 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1378 - input_section->vma);
1384 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1385 else if (howto->type == ARM_THUMB23)
1387 if ( h->class == C_EXT
1388 || h->class == C_STAT
1389 || h->class == C_LABEL)
1391 /* Thumb code calling an ARM function */
1394 unsigned long int tmp;
1395 long int ret_offset;
1396 struct coff_link_hash_entry * myh;
1397 struct coff_arm_link_hash_table * globals;
1399 myh = find_thumb_glue (info, name, input_bfd);
1403 globals = coff_arm_hash_table (info);
1405 BFD_ASSERT (globals != NULL);
1406 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1408 my_offset = myh->root.u.def.value;
1410 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1411 THUMB2ARM_GLUE_SECTION_NAME);
1413 BFD_ASSERT (s != NULL);
1414 BFD_ASSERT (s->contents != NULL);
1415 BFD_ASSERT (s->output_section != NULL);
1417 if ((my_offset & 0x01) == 0x01)
1419 if (h_sec->owner != NULL
1420 && INTERWORK_SET (h_sec->owner)
1421 && ! INTERWORK_FLAG (h_sec->owner)
1422 && ! globals->support_old_code)
1425 /* xgettext:c-format */
1426 (_("%s(%s): warning: interworking not enabled."),
1427 bfd_get_filename (h_sec->owner), name);
1429 /* xgettext:c-format */
1430 (_(" first occurrence: %s: thumb call to arm"),
1431 bfd_get_filename (input_bfd));
1433 (_(" consider relinking with --support-old-code enabled"));
1437 myh->root.u.def.value = my_offset;
1439 if (globals->support_old_code)
1441 bfd_put_16 (output_bfd, t2a1_push_insn,
1442 s->contents + my_offset);
1444 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1445 s->contents + my_offset + 2);
1447 bfd_put_16 (output_bfd, t2a3_mov_insn,
1448 s->contents + my_offset + 4);
1450 bfd_put_16 (output_bfd, t2a4_bx_insn,
1451 s->contents + my_offset + 6);
1453 bfd_put_32 (output_bfd, t2a5_pop_insn,
1454 s->contents + my_offset + 8);
1456 bfd_put_32 (output_bfd, t2a6_bx_insn,
1457 s->contents + my_offset + 12);
1459 /* Store the address of the function in the last word of the stub. */
1460 bfd_put_32 (output_bfd, h_val,
1461 s->contents + my_offset + 16);
1463 if (info->base_file)
1464 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1468 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1469 s->contents + my_offset);
1471 bfd_put_16 (output_bfd, t2a2_noop_insn,
1472 s->contents + my_offset + 2);
1475 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1477 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1478 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1479 + s->output_section->vma) /* Address of the start of the current section. */
1480 + 4 /* The branch instruction is 4 bytes into the stub. */
1481 + 8); /* ARM branches work from the pc of the instruction + 8. */
1483 bfd_put_32 (output_bfd,
1484 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1485 s->contents + my_offset + 4);
1490 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1492 /* Now go back and fix up the original BL insn to point
1497 - (input_section->output_offset
1501 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1502 - input_section->vma);
1504 bfd_put_32 (output_bfd,
1505 insert_thumb_branch (tmp, ret_offset),
1506 contents + rel->r_vaddr
1507 - input_section->vma);
1515 /* If the relocation type and destination symbol does not
1516 fall into one of the above categories, then we can just
1517 perform a direct link. */
1520 rstat = bfd_reloc_ok;
1522 #endif /* THUMBEXTENSION */
1523 if ( h->root.type == bfd_link_hash_defined
1524 || h->root.type == bfd_link_hash_defweak)
1528 sec = h->root.u.def.section;
1529 val = (h->root.u.def.value
1530 + sec->output_section->vma
1531 + sec->output_offset);
1534 else if (! info->relocateable)
1536 if (! ((*info->callbacks->undefined_symbol)
1537 (info, h->root.root.string, input_bfd, input_section,
1538 rel->r_vaddr - input_section->vma)))
1543 if (info->base_file)
1545 /* Emit a reloc if the backend thinks it needs it. */
1546 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1547 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1550 #if 1 /* THUMBEXTENSION */
1552 rstat = bfd_reloc_ok;
1554 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1555 else if (! info->relocateable
1556 && howto->type == ARM_THUMB23)
1558 /* This is pretty much a copy of what the default
1559 _bfd_final_link_relocate and _bfd_relocate_contents
1560 routines do to perform a relocation, with special
1561 processing for the split addressing of the Thumb BL
1562 instruction. Again, it would probably be simpler adding a
1563 ThumbBRANCH23 specific macro expansion into the default
1566 bfd_vma address = rel->r_vaddr - input_section->vma;
1568 if (address > input_section->_raw_size)
1569 rstat = bfd_reloc_outofrange;
1572 bfd_vma relocation = val + addend;
1573 int size = bfd_get_reloc_size (howto);
1574 boolean overflow = false;
1575 bfd_byte * location = contents + address;
1576 bfd_vma x = bfd_get_32 (input_bfd, location);
1577 bfd_vma src_mask = 0x007FFFFE;
1578 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1579 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1581 bfd_signed_vma signed_check;
1583 bfd_signed_vma signed_add;
1585 BFD_ASSERT (size == 4);
1587 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1588 relocation -= (input_section->output_section->vma
1589 + input_section->output_offset);
1591 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1592 relocation -= address;
1594 /* No need to negate the relocation with BRANCH23. */
1595 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1596 /* howto->rightshift == 1 */
1597 /* Drop unwanted bits from the value we are relocating to. */
1599 check = relocation >> howto->rightshift;
1601 /* If this is a signed value, the rightshift just dropped
1602 leading 1 bits (assuming twos complement). */
1603 if ((bfd_signed_vma) relocation >= 0)
1604 signed_check = check;
1606 signed_check = (check
1608 & ~((bfd_vma) - 1 >> howto->rightshift)));
1610 /* Get the value from the object file. */
1611 if (bfd_big_endian (input_bfd))
1613 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1617 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1620 /* Get the value from the object file with an appropriate sign.
1621 The expression involving howto->src_mask isolates the upper
1622 bit of src_mask. If that bit is set in the value we are
1623 adding, it is negative, and we subtract out that number times
1624 two. If src_mask includes the highest possible bit, then we
1625 can not get the upper bit, but that does not matter since
1626 signed_add needs no adjustment to become negative in that
1631 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1632 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1634 /* Add the value from the object file, shifted so that it is a
1636 /* howto->bitpos == 0 */
1638 signed_check += signed_add;
1639 relocation += signed_add;
1641 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1643 /* Assumes two's complement. */
1644 if ( signed_check > reloc_signed_max
1645 || signed_check < reloc_signed_min)
1648 /* Put RELOCATION into the correct bits: */
1650 if (bfd_big_endian (input_bfd))
1652 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1656 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1659 /* Add RELOCATION to the correct bits of X: */
1660 x = ((x & ~howto->dst_mask) | relocation);
1662 /* Put the relocated value back in the object file: */
1663 bfd_put_32 (input_bfd, x, location);
1665 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1670 #endif /* THUMBEXTENSION */
1671 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1673 rel->r_vaddr - input_section->vma,
1675 #if 1 /* THUMBEXTENSION */
1677 Is this the best way to fix up thumb addresses? krk@cygnus.com
1678 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1679 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1680 if (! info->relocateable
1681 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1683 /* Determine if we need to set the bottom bit of a relocated address
1684 because the address is the address of a Thumb code symbol. */
1686 int patchit = false;
1689 && ( h->class == C_THUMBSTATFUNC
1690 || h->class == C_THUMBEXTFUNC))
1694 else if (sym != NULL
1695 && sym->n_scnum > N_UNDEF)
1697 /* No hash entry - use the symbol instead. */
1699 if ( sym->n_sclass == C_THUMBSTATFUNC
1700 || sym->n_sclass == C_THUMBEXTFUNC)
1706 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1707 bfd_vma x = bfd_get_32 (input_bfd, location);
1709 bfd_put_32 (input_bfd, x | 1, location);
1712 #endif /* THUMBEXTENSION */
1720 case bfd_reloc_outofrange:
1721 (*_bfd_error_handler)
1722 (_("%s: bad reloc address 0x%lx in section `%s'"),
1723 bfd_get_filename (input_bfd),
1724 (unsigned long) rel->r_vaddr,
1725 bfd_get_section_name (input_bfd, input_section));
1727 case bfd_reloc_overflow:
1730 char buf[SYMNMLEN + 1];
1735 name = h->root.root.string;
1738 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1743 if (! ((*info->callbacks->reloc_overflow)
1744 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1745 input_section, rel->r_vaddr - input_section->vma)))
1754 #ifndef COFF_IMAGE_WITH_PE
1757 bfd_arm_allocate_interworking_sections (info)
1758 struct bfd_link_info * info;
1762 struct coff_arm_link_hash_table * globals;
1764 static char test_char = '1';
1767 globals = coff_arm_hash_table (info);
1769 BFD_ASSERT (globals != NULL);
1771 if (globals->arm_glue_size != 0)
1773 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1775 s = bfd_get_section_by_name
1776 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1778 BFD_ASSERT (s != NULL);
1780 foo = (bfd_byte *) bfd_alloc
1781 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1783 memset (foo, test_char, globals->arm_glue_size);
1786 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1790 if (globals->thumb_glue_size != 0)
1792 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1794 s = bfd_get_section_by_name
1795 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1797 BFD_ASSERT (s != NULL);
1799 foo = (bfd_byte *) bfd_alloc
1800 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1802 memset (foo, test_char, globals->thumb_glue_size);
1805 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1813 record_arm_to_thumb_glue (info, h)
1814 struct bfd_link_info * info;
1815 struct coff_link_hash_entry * h;
1817 const char * name = h->root.root.string;
1818 register asection * s;
1820 struct coff_link_hash_entry * myh;
1821 struct coff_arm_link_hash_table * globals;
1823 globals = coff_arm_hash_table (info);
1825 BFD_ASSERT (globals != NULL);
1826 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1828 s = bfd_get_section_by_name
1829 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1831 BFD_ASSERT (s != NULL);
1833 tmp_name = ((char *)
1834 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1836 BFD_ASSERT (tmp_name);
1838 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1840 myh = coff_link_hash_lookup
1841 (coff_hash_table (info), tmp_name, false, false, true);
1846 return; /* we've already seen this guy */
1849 /* The only trick here is using globals->arm_glue_size as the value. Even
1850 though the section isn't allocated yet, this is where we will be putting
1853 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1855 s, globals->arm_glue_size + 1,
1857 (struct bfd_link_hash_entry **) & myh);
1861 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1867 record_thumb_to_arm_glue (info, h)
1868 struct bfd_link_info * info;
1869 struct coff_link_hash_entry * h;
1871 const char * name = h->root.root.string;
1872 register asection * s;
1874 struct coff_link_hash_entry * myh;
1875 struct coff_arm_link_hash_table * globals;
1878 globals = coff_arm_hash_table (info);
1880 BFD_ASSERT (globals != NULL);
1881 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1883 s = bfd_get_section_by_name
1884 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1886 BFD_ASSERT (s != NULL);
1888 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1890 BFD_ASSERT (tmp_name);
1892 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1894 myh = coff_link_hash_lookup
1895 (coff_hash_table (info), tmp_name, false, false, true);
1900 return; /* we've already seen this guy */
1903 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1904 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1906 (struct bfd_link_hash_entry **) & myh);
1908 /* If we mark it 'thumb', the disassembler will do a better job. */
1909 myh->class = C_THUMBEXTFUNC;
1913 /* Allocate another symbol to mark where we switch to arm mode. */
1915 #define CHANGE_TO_ARM "__%s_change_to_arm"
1916 #define BACK_FROM_ARM "__%s_back_from_arm"
1918 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1920 BFD_ASSERT (tmp_name);
1922 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1926 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1927 BSF_LOCAL, s, globals->thumb_glue_size
1928 + (globals->support_old_code ? 8 : 4),
1930 (struct bfd_link_hash_entry **) & myh);
1934 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1939 /* Select a BFD to be used to hold the sections used by the glue code.
1940 This function is called from the linker scripts in ld/emultempl/
1944 bfd_arm_get_bfd_for_interworking (abfd, info)
1946 struct bfd_link_info * info;
1948 struct coff_arm_link_hash_table * globals;
1952 /* If we are only performing a partial link do not bother
1953 getting a bfd to hold the glue. */
1954 if (info->relocateable)
1957 globals = coff_arm_hash_table (info);
1959 BFD_ASSERT (globals != NULL);
1961 if (globals->bfd_of_glue_owner != NULL)
1964 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1968 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1970 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1973 || ! bfd_set_section_flags (abfd, sec, flags)
1974 || ! bfd_set_section_alignment (abfd, sec, 2))
1978 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1982 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1984 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1987 || ! bfd_set_section_flags (abfd, sec, flags)
1988 || ! bfd_set_section_alignment (abfd, sec, 2))
1992 /* Save the bfd for later use. */
1993 globals->bfd_of_glue_owner = abfd;
1999 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2001 struct bfd_link_info * info;
2002 int support_old_code;
2005 struct coff_arm_link_hash_table * globals;
2007 /* If we are only performing a partial link do not bother
2008 to construct any glue. */
2009 if (info->relocateable)
2012 /* Here we have a bfd that is to be included on the link. We have a hook
2013 to do reloc rummaging, before section sizes are nailed down. */
2015 _bfd_coff_get_external_symbols (abfd);
2017 globals = coff_arm_hash_table (info);
2019 BFD_ASSERT (globals != NULL);
2020 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2022 globals->support_old_code = support_old_code;
2024 /* Rummage around all the relocs and map the glue vectors. */
2025 sec = abfd->sections;
2030 for (; sec != NULL; sec = sec->next)
2032 struct internal_reloc * i;
2033 struct internal_reloc * rel;
2035 if (sec->reloc_count == 0)
2038 /* Load the relocs. */
2039 /* FIXME: there may be a storage leak here. */
2041 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2043 BFD_ASSERT (i != 0);
2045 for (rel = i; rel < i + sec->reloc_count; ++rel)
2047 unsigned short r_type = rel->r_type;
2048 unsigned long symndx;
2049 struct coff_link_hash_entry * h;
2051 symndx = rel->r_symndx;
2053 /* If the relocation is not against a symbol it cannot concern us. */
2057 /* If the index is outside of the range of our table, something has gone wrong. */
2058 if (symndx >= obj_conv_table_size (abfd))
2060 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2061 bfd_get_filename (abfd), symndx);
2065 h = obj_coff_sym_hashes (abfd)[symndx];
2067 /* If the relocation is against a static symbol it must be within
2068 the current section and so cannot be a cross ARM/Thumb relocation. */
2075 /* This one is a call from arm code. We need to look up
2076 the target of the call. If it is a thumb target, we
2079 if (h->class == C_THUMBEXTFUNC)
2080 record_arm_to_thumb_glue (info, h);
2085 /* This one is a call from thumb code. We used to look
2086 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2087 up the target of the call. If it is an arm target, we
2088 insert glue. If the symbol does not exist it will be
2089 given a class of C_EXT and so we will generate a stub
2090 for it. This is not really a problem, since the link
2091 is doomed anyway. */
2098 record_thumb_to_arm_glue (info, h);
2115 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2117 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2118 #define coff_relocate_section coff_arm_relocate_section
2119 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2120 #define coff_adjust_symndx coff_arm_adjust_symndx
2121 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2122 #define coff_final_link_postscript coff_arm_final_link_postscript
2123 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2124 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2125 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2126 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2127 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2130 /* When doing a relocateable link, we want to convert ARM26 relocs
2131 into ARM26D relocs. */
2134 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2135 bfd *obfd ATTRIBUTE_UNUSED;
2136 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2139 struct internal_reloc *irel;
2142 if (irel->r_type == 3)
2144 struct coff_link_hash_entry *h;
2146 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2148 && (h->root.type == bfd_link_hash_defined
2149 || h->root.type == bfd_link_hash_defweak)
2150 && h->root.u.def.section->output_section == sec->output_section)
2157 /* Called when merging the private data areas of two BFDs.
2158 This is important as it allows us to detect if we are
2159 attempting to merge binaries compiled for different ARM
2160 targets, eg different CPUs or differents APCS's. */
2163 coff_arm_merge_private_bfd_data (ibfd, obfd)
2167 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2172 /* If the two formats are different we cannot merge anything.
2173 This is not an error, since it is permissable to change the
2174 input and output formats. */
2175 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2176 || obfd->xvec->flavour != bfd_target_coff_flavour)
2179 /* Verify that the APCS is the same for the two BFDs */
2180 if (APCS_SET (ibfd))
2182 if (APCS_SET (obfd))
2184 /* If the src and dest have different APCS flag bits set, fail. */
2185 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2188 /* xgettext: c-format */
2189 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2190 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2191 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2194 bfd_set_error (bfd_error_wrong_format);
2198 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2202 if (APCS_FLOAT_FLAG (ibfd))
2203 /* xgettext: c-format */
2204 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2206 /* xgettext: c-format */
2207 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2209 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2210 bfd_get_filename (obfd));
2212 bfd_set_error (bfd_error_wrong_format);
2216 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2220 if (PIC_FLAG (ibfd))
2221 /* xgettext: c-format */
2222 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2224 /* xgettext: c-format */
2225 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2226 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2227 bfd_get_filename (obfd));
2229 bfd_set_error (bfd_error_wrong_format);
2235 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2237 /* Set up the arch and fields as well as these are probably wrong. */
2238 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2242 /* Check the interworking support. */
2243 if (INTERWORK_SET (ibfd))
2245 if (INTERWORK_SET (obfd))
2247 /* If the src and dest differ in their interworking issue a warning. */
2248 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2252 if (INTERWORK_FLAG (ibfd))
2253 /* xgettext: c-format */
2254 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2256 /* xgettext: c-format */
2257 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2259 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2260 bfd_get_filename (obfd));
2265 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]"));
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);
2372 /* Copy the important parts of the target specific data
2373 from one instance of a BFD to another. */
2376 coff_arm_copy_private_bfd_data (src, dest)
2380 BFD_ASSERT (src != NULL && dest != NULL);
2385 /* If the destination is not in the same format as the source, do not do
2387 if (src->xvec != dest->xvec)
2390 /* copy the flags field */
2393 if (APCS_SET (dest))
2395 /* If the src and dest have different APCS flag bits set, fail. */
2396 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2399 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2402 if (PIC_FLAG (dest) != PIC_FLAG (src))
2406 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2410 if (INTERWORK_SET (src))
2412 if (INTERWORK_SET (dest))
2414 /* If the src and dest have different interworking flags then turn
2415 off the interworking bit. */
2416 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2418 if (INTERWORK_FLAG (dest))
2420 /* xgettext:c-format */
2421 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2422 bfd_get_filename (dest),
2423 bfd_get_filename (src));
2426 SET_INTERWORK_FLAG (dest, 0);
2431 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2438 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2439 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2440 #define LOCAL_LABEL_PREFIX "."
2441 #ifndef USER_LABEL_PREFIX
2442 #define USER_LABEL_PREFIX "_"
2445 /* Like _bfd_coff_is_local_label_name, but
2446 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2448 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2449 labels of the form Lxxx to be stripped. */
2451 coff_arm_is_local_label_name (abfd, name)
2452 bfd * abfd ATTRIBUTE_UNUSED;
2455 #ifdef USER_LABEL_PREFIX
2456 if (USER_LABEL_PREFIX[0] != 0)
2458 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2463 #ifdef LOCAL_LABEL_PREFIX
2464 /* If there is a prefix for local labels then look for this.
2465 If the prefix exists, but it is empty, then ignore the test. */
2467 if (LOCAL_LABEL_PREFIX[0] != 0)
2469 int len = strlen (LOCAL_LABEL_PREFIX);
2471 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2474 /* Perform the checks below for the rest of the name. */
2479 return name[0] == 'L';
2482 /* This piece of machinery exists only to guarantee that the bfd that holds
2483 the glue section is written last.
2485 This does depend on bfd_make_section attaching a new section to the
2486 end of the section list for the bfd.
2491 coff_arm_link_output_has_begun (sub, info)
2493 struct coff_final_link_info * info;
2495 return (sub->output_has_begun
2496 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2500 coff_arm_final_link_postscript (abfd, pfinfo)
2501 bfd * abfd ATTRIBUTE_UNUSED;
2502 struct coff_final_link_info * pfinfo;
2504 struct coff_arm_link_hash_table * globals;
2506 globals = coff_arm_hash_table (pfinfo->info);
2508 BFD_ASSERT (globals != NULL);
2510 if (globals->bfd_of_glue_owner != NULL)
2512 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2515 globals->bfd_of_glue_owner->output_has_begun = true;
2521 #include "coffcode.h"
2523 #ifndef TARGET_LITTLE_SYM
2524 #define TARGET_LITTLE_SYM armcoff_little_vec
2526 #ifndef TARGET_LITTLE_NAME
2527 #define TARGET_LITTLE_NAME "coff-arm-little"
2529 #ifndef TARGET_BIG_SYM
2530 #define TARGET_BIG_SYM armcoff_big_vec
2532 #ifndef TARGET_BIG_NAME
2533 #define TARGET_BIG_NAME "coff-arm-big"
2536 #ifndef TARGET_UNDERSCORE
2537 #define TARGET_UNDERSCORE 0
2541 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2543 #define EXTRA_S_FLAGS 0
2546 /* Forward declaration for use initialising alternative_target field. */
2547 extern const bfd_target TARGET_BIG_SYM ;
2549 /* Target vectors. */
2550 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2551 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)