1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
29 #include "coff/internal.h"
37 /* Macros for manipulation the bits in the flags field of the coff data
39 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
40 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
41 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
42 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
43 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
44 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
45 | (flgs | F_APCS_SET))
46 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
47 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
48 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
49 (coff_data (abfd)->flags & ~ F_INTERWORK) \
50 | (flg | F_INTERWORK_SET))
53 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
56 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
57 /* some typedefs for holding instructions */
58 typedef unsigned long int insn32;
59 typedef unsigned short int insn16;
61 /* Forward declarations for stupid compilers. */
62 static boolean coff_arm_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 struct internal_reloc *, struct internal_syment *, asection **));
65 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type aoutarm_fix_pcrel_26
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_23
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_thumb_pcrel_12
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static bfd_reloc_status_type coff_thumb_pcrel_9
74 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
75 static bfd_reloc_status_type coff_arm_reloc
76 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
77 static boolean coff_arm_adjust_symndx
78 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
79 asection *, struct internal_reloc *, boolean *));
80 static reloc_howto_type * coff_arm_rtype_to_howto
81 PARAMS ((bfd *, asection *, struct internal_reloc *,
82 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
83 static bfd_reloc_status_type coff_thumb_pcrel_common
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
85 thumb_pcrel_branchtype));
86 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
87 PARAMS ((bfd *, bfd_reloc_code_real_type));
88 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
90 static insn32 insert_thumb_branch
91 PARAMS ((insn32, int));
92 static struct coff_link_hash_entry * find_thumb_glue
93 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
94 static struct coff_link_hash_entry * find_arm_glue
95 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
96 #ifndef COFF_IMAGE_WITH_PE
97 static void record_arm_to_thumb_glue
98 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
99 static void record_thumb_to_arm_glue
100 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
102 static boolean coff_arm_merge_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_print_private_bfd_data
105 PARAMS ((bfd *, PTR));
106 static boolean _bfd_coff_arm_set_private_flags
107 PARAMS ((bfd *, flagword));
108 static boolean coff_arm_copy_private_bfd_data
109 PARAMS ((bfd *, bfd *));
110 static boolean coff_arm_is_local_label_name
111 PARAMS ((bfd *, const char *));
112 static boolean coff_arm_link_output_has_begun
113 PARAMS ((bfd *, struct coff_final_link_info *));
114 static boolean coff_arm_final_link_postscript
115 PARAMS ((bfd *, struct coff_final_link_info *));
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);
821 static CONST struct reloc_howto_struct *
822 coff_arm_reloc_type_lookup (abfd, code)
824 bfd_reloc_code_real_type code;
826 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
828 if (code == BFD_RELOC_CTOR)
829 switch (bfd_get_arch_info (abfd)->bits_per_address)
834 default: return (CONST struct reloc_howto_struct *) 0;
840 ASTD (BFD_RELOC_32, ARM_32);
841 ASTD (BFD_RELOC_RVA, ARM_RVA32);
842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
843 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
845 ASTD (BFD_RELOC_8, ARM_8);
846 ASTD (BFD_RELOC_16, ARM_16);
847 ASTD (BFD_RELOC_32, ARM_32);
848 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
849 ASTD (BFD_RELOC_ARM_PCREL_BLX, 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);
857 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
859 default: return (CONST struct reloc_howto_struct *) 0;
863 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
864 #define COFF_PAGE_SIZE 0x1000
865 /* Turn a howto into a reloc nunmber */
867 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
868 #define BADMAG(x) ARMBADMAG(x)
869 #define ARM 1 /* Customize coffcode.h */
871 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
872 This allows us to store global data here without actually creating any
873 global variables, which is a no-no in the BFD world. */
874 struct coff_arm_link_hash_table
876 /* The original coff_link_hash_table structure. MUST be first field. */
877 struct coff_link_hash_table root;
879 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
880 long int thumb_glue_size;
882 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
883 long int arm_glue_size;
885 /* An arbitary input BFD chosen to hold the glue sections. */
886 bfd * bfd_of_glue_owner;
888 /* Support interworking with old, non-interworking aware ARM code. */
889 int support_old_code;
892 /* Get the ARM coff linker hash table from a link_info structure. */
893 #define coff_arm_hash_table(info) \
894 ((struct coff_arm_link_hash_table *) ((info)->hash))
896 /* Create an ARM coff linker hash table. */
898 static struct bfd_link_hash_table *
899 coff_arm_link_hash_table_create (abfd)
902 struct coff_arm_link_hash_table * ret;
904 ret = ((struct coff_arm_link_hash_table *)
905 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
906 if (ret == (struct coff_arm_link_hash_table *) NULL)
909 if (! _bfd_coff_link_hash_table_init
910 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
912 bfd_release (abfd, ret);
913 return (struct bfd_link_hash_table *) NULL;
916 ret->thumb_glue_size = 0;
917 ret->arm_glue_size = 0;
918 ret->bfd_of_glue_owner = NULL;
920 return & ret->root.root;
924 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
925 struct bfd_link_info *info;
927 asection *input_section;
928 bfd_vma reloc_offset;
930 bfd_vma addr = reloc_offset
932 + input_section->output_offset
933 + input_section->output_section->vma;
935 if (coff_data(output_bfd)->pe)
936 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
937 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
941 /* The thumb form of a long branch is a bit finicky, because the offset
942 encoding is split over two fields, each in it's own instruction. They
943 can occur in any order. So given a thumb form of long branch, and an
944 offset, insert the offset into the thumb branch and return finished
947 It takes two thumb instructions to encode the target address. Each has
948 11 bits to invest. The upper 11 bits are stored in one (identifed by
949 H-0.. see below), the lower 11 bits are stored in the other (identified
952 Combine together and shifted left by 1 (it's a half word address) and
956 H-0, upper address-0 = 000
958 H-1, lower address-0 = 800
960 They can be ordered either way, but the arm tools I've seen always put
961 the lower one first. It probably doesn't matter. krk@cygnus.com
963 XXX: Actually the order does matter. The second instruction (H-1)
964 moves the computed address into the PC, so it must be the second one
965 in the sequence. The problem, however is that whilst little endian code
966 stores the instructions in HI then LOW order, big endian code does the
967 reverse. nickc@cygnus.com */
969 #define LOW_HI_ORDER 0xF800F000
970 #define HI_LOW_ORDER 0xF000F800
973 insert_thumb_branch (br_insn, rel_off)
977 unsigned int low_bits;
978 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 */
998 static struct coff_link_hash_entry *
999 find_thumb_glue (info, name, input_bfd)
1000 struct bfd_link_info * info;
1005 struct coff_link_hash_entry * myh;
1007 tmp_name = ((char *)
1008 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
1010 BFD_ASSERT (tmp_name);
1012 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1014 myh = coff_link_hash_lookup
1015 (coff_hash_table (info), tmp_name, false, false, true);
1018 /* xgettext:c-format */
1019 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1020 bfd_get_filename (input_bfd), tmp_name, name);
1027 static struct coff_link_hash_entry *
1028 find_arm_glue (info, name, input_bfd)
1029 struct bfd_link_info * info;
1034 struct coff_link_hash_entry * myh;
1036 tmp_name = ((char *)
1037 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1039 BFD_ASSERT (tmp_name);
1041 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1043 myh = coff_link_hash_lookup
1044 (coff_hash_table (info), tmp_name, false, false, true);
1047 /* xgettext:c-format */
1048 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1049 bfd_get_filename (input_bfd), tmp_name, name);
1061 ldr r12, __func_addr
1064 .word func @ behave as if you saw a ARM_32 reloc
1067 #define ARM2THUMB_GLUE_SIZE 12
1068 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1069 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1070 static const insn32 a2t3_func_addr_insn = 0x00000001;
1073 Thumb->ARM: Thumb->(non-interworking aware) ARM
1077 __func_from_thumb: __func_from_thumb:
1079 nop ldr r6, __func_addr
1081 __func_change_to_arm: bx r6
1083 __func_back_to_thumb:
1090 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1091 static const insn16 t2a1_bx_pc_insn = 0x4778;
1092 static const insn16 t2a2_noop_insn = 0x46c0;
1093 static const insn32 t2a3_b_insn = 0xea000000;
1095 static const insn16 t2a1_push_insn = 0xb540;
1096 static const insn16 t2a2_ldr_insn = 0x4e03;
1097 static const insn16 t2a3_mov_insn = 0x46fe;
1098 static const insn16 t2a4_bx_insn = 0x4730;
1099 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1100 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1103 We should really create new local (static) symbols in destination
1104 object for each stub we create. We should also create local
1105 (static) symbols within the stubs when switching between ARM and
1106 Thumb code. This will ensure that the debugger and disassembler
1107 can present a better view of stubs.
1109 We can treat stubs like literal sections, and for the THUMB9 ones
1110 (short addressing range) we should be able to insert the stubs
1111 between sections. i.e. the simplest approach (since relocations
1112 are done on a section basis) is to dump the stubs at the end of
1113 processing a section. That way we can always try and minimise the
1114 offset to and from a stub. However, this does not map well onto
1115 the way that the linker/BFD does its work: mapping all input
1116 sections to output sections via the linker script before doing
1119 Unfortunately it may be easier to just to disallow short range
1120 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1121 only branch-and-link (BL) calls. This will simplify the processing
1122 since we can then put all of the stubs into their own section.
1125 On a different subject, rather than complaining when a
1126 branch cannot fit in the number of bits available for the
1127 instruction we should generate a trampoline stub (needed to
1128 address the complete 32bit address space). */
1130 /* The standard COFF backend linker does not cope with the special
1131 Thumb BRANCH23 relocation. The alternative would be to split the
1132 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1133 bit simpler simply providing our own relocation driver. */
1135 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1136 This code is a very slightly modified copy of
1137 _bfd_coff_generic_relocate_section. It would be a much more
1138 maintainable solution to have a MACRO that could be expanded within
1139 _bfd_coff_generic_relocate_section that would only be provided for
1140 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1141 is different from the original. */
1144 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1145 contents, relocs, syms, sections)
1147 struct bfd_link_info *info;
1149 asection *input_section;
1151 struct internal_reloc *relocs;
1152 struct internal_syment *syms;
1153 asection **sections;
1155 struct internal_reloc * rel;
1156 struct internal_reloc * relend;
1159 relend = rel + input_section->reloc_count;
1161 for (; rel < relend; rel++)
1165 struct coff_link_hash_entry * h;
1166 struct internal_syment * sym;
1169 reloc_howto_type * howto;
1170 bfd_reloc_status_type rstat;
1173 symndx = rel->r_symndx;
1182 h = obj_coff_sym_hashes (input_bfd)[symndx];
1183 sym = syms + symndx;
1186 /* COFF treats common symbols in one of two ways. Either the
1187 size of the symbol is included in the section contents, or it
1188 is not. We assume that the size is not included, and force
1189 the rtype_to_howto function to adjust the addend as needed. */
1191 if (sym != NULL && sym->n_scnum != 0)
1192 addend = - sym->n_value;
1196 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1201 /* The relocation_section function will skip pcrel_offset relocs
1202 when doing a relocateable link. However, we want to convert
1203 ARM26 to ARM26D relocs if possible. We return a fake howto in
1204 this case without pcrel_offset set, and adjust the addend to
1206 if (rel->r_type == ARM_26
1208 && info->relocateable
1209 && (h->root.type == bfd_link_hash_defined
1210 || h->root.type == bfd_link_hash_defweak)
1211 && h->root.u.def.section->output_section == input_section->output_section)
1213 static reloc_howto_type fake_arm26_reloc =
1220 complain_overflow_signed,
1221 aoutarm_fix_pcrel_26 ,
1228 addend -= rel->r_vaddr - input_section->vma;
1229 howto = &fake_arm26_reloc;
1233 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1234 the next opcode's pc, so is off by one. */
1235 if (howto->pc_relative && !info->relocateable)
1239 /* If we are doing a relocateable link, then we can just ignore
1240 a PC relative reloc that is pcrel_offset. It will already
1241 have the correct value. If this is not a relocateable link,
1242 then we should ignore the symbol value. */
1243 if (howto->pc_relative && howto->pcrel_offset)
1245 if (info->relocateable)
1247 /* FIXME - it is not clear which targets need this next test
1248 and which do not. It is known that it is needed for the
1249 VXworks target (hence the #ifdef), but it is also known
1250 that it was supressed for other (arm) targets. This ought
1251 to be sorted out one day. */
1253 /* We must not ignore the symbol value. If the symbol is
1254 within the same section, the relocation should have already
1255 been fixed, but if it is not, we'll be handed a reloc into
1256 the beginning of the symbol's section, so we must not cancel
1257 out the symbol's value, otherwise we'll be adding it in
1259 if (sym != NULL && sym->n_scnum != 0)
1260 addend += sym->n_value;
1272 sec = bfd_abs_section_ptr;
1277 sec = sections[symndx];
1278 val = (sec->output_section->vma
1279 + sec->output_offset
1286 #if 1 /* THUMBEXTENSION */
1287 /* We don't output the stubs if we are generating a
1288 relocatable output file, since we may as well leave the
1289 stub generation to the final linker pass. If we fail to
1290 verify that the name is defined, we'll try to build stubs
1291 for an undefined name... */
1292 if (! info->relocateable
1293 && ( h->root.type == bfd_link_hash_defined
1294 || h->root.type == bfd_link_hash_defweak))
1296 asection * h_sec = h->root.u.def.section;
1297 const char * name = h->root.root.string;
1299 /* h locates the symbol referenced in the reloc. */
1300 h_val = (h->root.u.def.value
1301 + h_sec->output_section->vma
1302 + h_sec->output_offset);
1304 if (howto->type == ARM_26)
1306 if ( h->class == C_THUMBSTATFUNC
1307 || h->class == C_THUMBEXTFUNC)
1309 /* Arm code calling a Thumb function */
1310 unsigned long int tmp;
1313 long int ret_offset;
1314 struct coff_link_hash_entry * myh;
1315 struct coff_arm_link_hash_table * globals;
1317 myh = find_arm_glue (info, name, input_bfd);
1321 globals = coff_arm_hash_table (info);
1323 BFD_ASSERT (globals != NULL);
1324 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1326 my_offset = myh->root.u.def.value;
1328 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1329 ARM2THUMB_GLUE_SECTION_NAME);
1330 BFD_ASSERT (s != NULL);
1331 BFD_ASSERT (s->contents != NULL);
1332 BFD_ASSERT (s->output_section != NULL);
1334 if ((my_offset & 0x01) == 0x01)
1336 if (h_sec->owner != NULL
1337 && INTERWORK_SET (h_sec->owner)
1338 && ! INTERWORK_FLAG (h_sec->owner))
1341 /* xgettext:c-format */
1342 (_("%s(%s): warning: interworking not enabled."),
1343 bfd_get_filename (h_sec->owner), name);
1345 /* xgettext:c-format */
1346 (_(" first occurrence: %s: arm call to thumb"),
1347 bfd_get_filename (input_bfd));
1351 myh->root.u.def.value = my_offset;
1353 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1354 s->contents + my_offset);
1356 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1357 s->contents + my_offset + 4);
1359 /* It's a thumb address. Add the low order bit. */
1360 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1361 s->contents + my_offset + 8);
1363 if (info->base_file)
1364 arm_emit_base_file_entry (info, output_bfd, s,
1369 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1371 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1372 - input_section->vma);
1374 tmp = tmp & 0xFF000000;
1376 /* Somehow these are both 4 too far, so subtract 8. */
1380 + s->output_section->vma
1381 - (input_section->output_offset
1382 + input_section->output_section->vma
1386 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1388 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1389 - input_section->vma);
1395 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1396 else if (howto->type == ARM_THUMB23)
1398 if ( h->class == C_EXT
1399 || h->class == C_STAT
1400 || h->class == C_LABEL)
1402 /* Thumb code calling an ARM function */
1405 unsigned long int tmp;
1406 long int ret_offset;
1407 struct coff_link_hash_entry * myh;
1408 struct coff_arm_link_hash_table * globals;
1410 myh = find_thumb_glue (info, name, input_bfd);
1414 globals = coff_arm_hash_table (info);
1416 BFD_ASSERT (globals != NULL);
1417 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1419 my_offset = myh->root.u.def.value;
1421 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1422 THUMB2ARM_GLUE_SECTION_NAME);
1424 BFD_ASSERT (s != NULL);
1425 BFD_ASSERT (s->contents != NULL);
1426 BFD_ASSERT (s->output_section != NULL);
1428 if ((my_offset & 0x01) == 0x01)
1430 if (h_sec->owner != NULL
1431 && INTERWORK_SET (h_sec->owner)
1432 && ! INTERWORK_FLAG (h_sec->owner)
1433 && ! globals->support_old_code)
1436 /* xgettext:c-format */
1437 (_("%s(%s): warning: interworking not enabled."),
1438 bfd_get_filename (h_sec->owner), name);
1440 /* xgettext:c-format */
1441 (_(" first occurrence: %s: thumb call to arm"),
1442 bfd_get_filename (input_bfd));
1444 (_(" consider relinking with --support-old-code enabled"));
1448 myh->root.u.def.value = my_offset;
1450 if (globals->support_old_code)
1452 bfd_put_16 (output_bfd, t2a1_push_insn,
1453 s->contents + my_offset);
1455 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1456 s->contents + my_offset + 2);
1458 bfd_put_16 (output_bfd, t2a3_mov_insn,
1459 s->contents + my_offset + 4);
1461 bfd_put_16 (output_bfd, t2a4_bx_insn,
1462 s->contents + my_offset + 6);
1464 bfd_put_32 (output_bfd, t2a5_pop_insn,
1465 s->contents + my_offset + 8);
1467 bfd_put_32 (output_bfd, t2a6_bx_insn,
1468 s->contents + my_offset + 12);
1470 /* Store the address of the function in the last word of the stub. */
1471 bfd_put_32 (output_bfd, h_val,
1472 s->contents + my_offset + 16);
1474 if (info->base_file)
1475 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1479 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1480 s->contents + my_offset);
1482 bfd_put_16 (output_bfd, t2a2_noop_insn,
1483 s->contents + my_offset + 2);
1486 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1488 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1489 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1490 + s->output_section->vma) /* Address of the start of the current section. */
1491 + 4 /* The branch instruction is 4 bytes into the stub. */
1492 + 8); /* ARM branches work from the pc of the instruction + 8. */
1494 bfd_put_32 (output_bfd,
1495 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1496 s->contents + my_offset + 4);
1501 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1503 /* Now go back and fix up the original BL insn to point
1508 - (input_section->output_offset
1512 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1513 - input_section->vma);
1515 bfd_put_32 (output_bfd,
1516 insert_thumb_branch (tmp, ret_offset),
1517 contents + rel->r_vaddr
1518 - input_section->vma);
1526 /* If the relocation type and destination symbol does not
1527 fall into one of the above categories, then we can just
1528 perform a direct link. */
1531 rstat = bfd_reloc_ok;
1533 #endif /* THUMBEXTENSION */
1534 if ( h->root.type == bfd_link_hash_defined
1535 || h->root.type == bfd_link_hash_defweak)
1539 sec = h->root.u.def.section;
1540 val = (h->root.u.def.value
1541 + sec->output_section->vma
1542 + sec->output_offset);
1545 else if (! info->relocateable)
1547 if (! ((*info->callbacks->undefined_symbol)
1548 (info, h->root.root.string, input_bfd, input_section,
1549 rel->r_vaddr - input_section->vma, true)))
1554 if (info->base_file)
1556 /* Emit a reloc if the backend thinks it needs it. */
1557 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1558 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1561 #if 1 /* THUMBEXTENSION */
1563 rstat = bfd_reloc_ok;
1565 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1566 else if (! info->relocateable
1567 && howto->type == ARM_THUMB23)
1569 /* This is pretty much a copy of what the default
1570 _bfd_final_link_relocate and _bfd_relocate_contents
1571 routines do to perform a relocation, with special
1572 processing for the split addressing of the Thumb BL
1573 instruction. Again, it would probably be simpler adding a
1574 ThumbBRANCH23 specific macro expansion into the default
1577 bfd_vma address = rel->r_vaddr - input_section->vma;
1579 if (address > input_section->_raw_size)
1580 rstat = bfd_reloc_outofrange;
1583 bfd_vma relocation = val + addend;
1584 int size = bfd_get_reloc_size (howto);
1585 boolean overflow = false;
1586 bfd_byte * location = contents + address;
1587 bfd_vma x = bfd_get_32 (input_bfd, location);
1588 bfd_vma src_mask = 0x007FFFFE;
1589 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1590 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1592 bfd_signed_vma signed_check;
1594 bfd_signed_vma signed_add;
1596 BFD_ASSERT (size == 4);
1598 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1599 relocation -= (input_section->output_section->vma
1600 + input_section->output_offset);
1602 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1603 relocation -= address;
1605 /* No need to negate the relocation with BRANCH23. */
1606 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1607 /* howto->rightshift == 1 */
1609 /* Drop unwanted bits from the value we are relocating to. */
1610 check = relocation >> howto->rightshift;
1612 /* If this is a signed value, the rightshift just dropped
1613 leading 1 bits (assuming twos complement). */
1614 if ((bfd_signed_vma) relocation >= 0)
1615 signed_check = check;
1617 signed_check = (check
1619 & ~((bfd_vma) - 1 >> howto->rightshift)));
1621 /* Get the value from the object file. */
1622 if (bfd_big_endian (input_bfd))
1623 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1625 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1627 /* Get the value from the object file with an appropriate sign.
1628 The expression involving howto->src_mask isolates the upper
1629 bit of src_mask. If that bit is set in the value we are
1630 adding, it is negative, and we subtract out that number times
1631 two. If src_mask includes the highest possible bit, then we
1632 can not get the upper bit, but that does not matter since
1633 signed_add needs no adjustment to become negative in that
1637 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1638 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1640 /* howto->bitpos == 0 */
1641 /* Add the value from the object file, shifted so that it is a
1643 signed_check += signed_add;
1644 relocation += signed_add;
1646 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1648 /* Assumes two's complement. */
1649 if ( signed_check > reloc_signed_max
1650 || signed_check < reloc_signed_min)
1653 /* For the BLX(1) instruction remove bit 0 of the adjusted offset.
1654 Bit 0 can only be set if the upper insn is at a half-word boundary,
1655 since the destination address, an ARM instruction, must always be
1656 on a word boundary. The semantics of the BLX (1) instruction,
1657 however, are that bit 0 in the offset must always be 0, and the
1658 corresponding bit 1 in the target address will be set from bit
1659 1 of the source address. */
1660 if ((x & 0x18000000) == 0x08000000)
1663 /* Put the relocation into the correct bits. */
1664 if (bfd_big_endian (input_bfd))
1665 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1667 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1669 /* Add the relocation to the correct bits of X. */
1670 x = ((x & ~howto->dst_mask) | relocation);
1672 /* Put the relocated value back in the object file. */
1673 bfd_put_32 (input_bfd, x, location);
1675 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1680 #endif /* THUMBEXTENSION */
1681 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1683 rel->r_vaddr - input_section->vma,
1685 #if 1 /* THUMBEXTENSION */
1687 Is this the best way to fix up thumb addresses? krk@cygnus.com
1688 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1689 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1690 if (! info->relocateable
1691 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1693 /* Determine if we need to set the bottom bit of a relocated address
1694 because the address is the address of a Thumb code symbol. */
1696 int patchit = false;
1699 && ( h->class == C_THUMBSTATFUNC
1700 || h->class == C_THUMBEXTFUNC))
1704 else if (sym != NULL
1705 && sym->n_scnum > N_UNDEF)
1707 /* No hash entry - use the symbol instead. */
1709 if ( sym->n_sclass == C_THUMBSTATFUNC
1710 || sym->n_sclass == C_THUMBEXTFUNC)
1716 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1717 bfd_vma x = bfd_get_32 (input_bfd, location);
1719 bfd_put_32 (input_bfd, x | 1, location);
1722 #endif /* THUMBEXTENSION */
1730 case bfd_reloc_outofrange:
1731 (*_bfd_error_handler)
1732 (_("%s: bad reloc address 0x%lx in section `%s'"),
1733 bfd_get_filename (input_bfd),
1734 (unsigned long) rel->r_vaddr,
1735 bfd_get_section_name (input_bfd, input_section));
1737 case bfd_reloc_overflow:
1740 char buf[SYMNMLEN + 1];
1745 name = h->root.root.string;
1748 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1753 if (! ((*info->callbacks->reloc_overflow)
1754 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1755 input_section, rel->r_vaddr - input_section->vma)))
1764 #ifndef COFF_IMAGE_WITH_PE
1767 bfd_arm_allocate_interworking_sections (info)
1768 struct bfd_link_info * info;
1772 struct coff_arm_link_hash_table * globals;
1774 static char test_char = '1';
1777 globals = coff_arm_hash_table (info);
1779 BFD_ASSERT (globals != NULL);
1781 if (globals->arm_glue_size != 0)
1783 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1785 s = bfd_get_section_by_name
1786 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1788 BFD_ASSERT (s != NULL);
1790 foo = (bfd_byte *) bfd_alloc
1791 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1793 memset (foo, test_char, globals->arm_glue_size);
1796 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1800 if (globals->thumb_glue_size != 0)
1802 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1804 s = bfd_get_section_by_name
1805 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1807 BFD_ASSERT (s != NULL);
1809 foo = (bfd_byte *) bfd_alloc
1810 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1812 memset (foo, test_char, globals->thumb_glue_size);
1815 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1823 record_arm_to_thumb_glue (info, h)
1824 struct bfd_link_info * info;
1825 struct coff_link_hash_entry * h;
1827 const char * name = h->root.root.string;
1828 register asection * s;
1830 struct coff_link_hash_entry * myh;
1831 struct coff_arm_link_hash_table * globals;
1833 globals = coff_arm_hash_table (info);
1835 BFD_ASSERT (globals != NULL);
1836 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1838 s = bfd_get_section_by_name
1839 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1841 BFD_ASSERT (s != NULL);
1843 tmp_name = ((char *)
1844 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1846 BFD_ASSERT (tmp_name);
1848 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1850 myh = coff_link_hash_lookup
1851 (coff_hash_table (info), tmp_name, false, false, true);
1856 return; /* we've already seen this guy */
1859 /* The only trick here is using globals->arm_glue_size as the value. Even
1860 though the section isn't allocated yet, this is where we will be putting
1863 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1865 s, globals->arm_glue_size + 1,
1867 (struct bfd_link_hash_entry **) & myh);
1871 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1877 record_thumb_to_arm_glue (info, h)
1878 struct bfd_link_info * info;
1879 struct coff_link_hash_entry * h;
1881 const char * name = h->root.root.string;
1882 register asection * s;
1884 struct coff_link_hash_entry * myh;
1885 struct coff_arm_link_hash_table * globals;
1887 globals = coff_arm_hash_table (info);
1889 BFD_ASSERT (globals != NULL);
1890 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1892 s = bfd_get_section_by_name
1893 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1895 BFD_ASSERT (s != NULL);
1897 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1899 BFD_ASSERT (tmp_name);
1901 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1903 myh = coff_link_hash_lookup
1904 (coff_hash_table (info), tmp_name, false, false, true);
1909 return; /* we've already seen this guy */
1912 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1913 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1915 (struct bfd_link_hash_entry **) & myh);
1917 /* If we mark it 'thumb', the disassembler will do a better job. */
1918 myh->class = C_THUMBEXTFUNC;
1922 /* Allocate another symbol to mark where we switch to arm mode. */
1924 #define CHANGE_TO_ARM "__%s_change_to_arm"
1925 #define BACK_FROM_ARM "__%s_back_from_arm"
1927 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1929 BFD_ASSERT (tmp_name);
1931 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1935 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1936 BSF_LOCAL, s, globals->thumb_glue_size
1937 + (globals->support_old_code ? 8 : 4),
1939 (struct bfd_link_hash_entry **) & myh);
1943 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1948 /* Select a BFD to be used to hold the sections used by the glue code.
1949 This function is called from the linker scripts in ld/emultempl/
1953 bfd_arm_get_bfd_for_interworking (abfd, info)
1955 struct bfd_link_info * info;
1957 struct coff_arm_link_hash_table * globals;
1961 /* If we are only performing a partial link do not bother
1962 getting a bfd to hold the glue. */
1963 if (info->relocateable)
1966 globals = coff_arm_hash_table (info);
1968 BFD_ASSERT (globals != NULL);
1970 if (globals->bfd_of_glue_owner != NULL)
1973 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1977 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1979 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1982 || ! bfd_set_section_flags (abfd, sec, flags)
1983 || ! bfd_set_section_alignment (abfd, sec, 2))
1987 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1991 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1993 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1996 || ! bfd_set_section_flags (abfd, sec, flags)
1997 || ! bfd_set_section_alignment (abfd, sec, 2))
2001 /* Save the bfd for later use. */
2002 globals->bfd_of_glue_owner = abfd;
2008 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2010 struct bfd_link_info * info;
2011 int support_old_code;
2014 struct coff_arm_link_hash_table * globals;
2016 /* If we are only performing a partial link do not bother
2017 to construct any glue. */
2018 if (info->relocateable)
2021 /* Here we have a bfd that is to be included on the link. We have a hook
2022 to do reloc rummaging, before section sizes are nailed down. */
2024 _bfd_coff_get_external_symbols (abfd);
2026 globals = coff_arm_hash_table (info);
2028 BFD_ASSERT (globals != NULL);
2029 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2031 globals->support_old_code = support_old_code;
2033 /* Rummage around all the relocs and map the glue vectors. */
2034 sec = abfd->sections;
2039 for (; sec != NULL; sec = sec->next)
2041 struct internal_reloc * i;
2042 struct internal_reloc * rel;
2044 if (sec->reloc_count == 0)
2047 /* Load the relocs. */
2048 /* FIXME: there may be a storage leak here. */
2050 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2052 BFD_ASSERT (i != 0);
2054 for (rel = i; rel < i + sec->reloc_count; ++rel)
2056 unsigned short r_type = rel->r_type;
2058 struct coff_link_hash_entry * h;
2060 symndx = rel->r_symndx;
2062 /* If the relocation is not against a symbol it cannot concern us. */
2066 /* If the index is outside of the range of our table, something has gone wrong. */
2067 if (symndx >= obj_conv_table_size (abfd))
2069 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2070 bfd_get_filename (abfd), symndx);
2074 h = obj_coff_sym_hashes (abfd)[symndx];
2076 /* If the relocation is against a static symbol it must be within
2077 the current section and so cannot be a cross ARM/Thumb relocation. */
2084 /* This one is a call from arm code. We need to look up
2085 the target of the call. If it is a thumb target, we
2088 if (h->class == C_THUMBEXTFUNC)
2089 record_arm_to_thumb_glue (info, h);
2094 /* This one is a call from thumb code. We used to look
2095 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2096 up the target of the call. If it is an arm target, we
2097 insert glue. If the symbol does not exist it will be
2098 given a class of C_EXT and so we will generate a stub
2099 for it. This is not really a problem, since the link
2100 is doomed anyway. */
2107 record_thumb_to_arm_glue (info, h);
2124 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2126 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2127 #define coff_relocate_section coff_arm_relocate_section
2128 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2129 #define coff_adjust_symndx coff_arm_adjust_symndx
2130 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2131 #define coff_final_link_postscript coff_arm_final_link_postscript
2132 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2133 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2134 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2135 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2136 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2138 /* When doing a relocateable link, we want to convert ARM26 relocs
2139 into ARM26D relocs. */
2142 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2143 bfd *obfd ATTRIBUTE_UNUSED;
2144 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2147 struct internal_reloc *irel;
2150 if (irel->r_type == 3)
2152 struct coff_link_hash_entry *h;
2154 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2156 && (h->root.type == bfd_link_hash_defined
2157 || h->root.type == bfd_link_hash_defweak)
2158 && h->root.u.def.section->output_section == sec->output_section)
2165 /* Called when merging the private data areas of two BFDs.
2166 This is important as it allows us to detect if we are
2167 attempting to merge binaries compiled for different ARM
2168 targets, eg different CPUs or differents APCS's. */
2171 coff_arm_merge_private_bfd_data (ibfd, obfd)
2175 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2180 /* If the two formats are different we cannot merge anything.
2181 This is not an error, since it is permissable to change the
2182 input and output formats. */
2183 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2184 || obfd->xvec->flavour != bfd_target_coff_flavour)
2187 /* Verify that the APCS is the same for the two BFDs */
2188 if (APCS_SET (ibfd))
2190 if (APCS_SET (obfd))
2192 /* If the src and dest have different APCS flag bits set, fail. */
2193 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2196 /* xgettext: c-format */
2197 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2198 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2199 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2202 bfd_set_error (bfd_error_wrong_format);
2206 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2210 if (APCS_FLOAT_FLAG (ibfd))
2211 /* xgettext: c-format */
2212 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2214 /* xgettext: c-format */
2215 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2217 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2218 bfd_get_filename (obfd));
2220 bfd_set_error (bfd_error_wrong_format);
2224 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2228 if (PIC_FLAG (ibfd))
2229 /* xgettext: c-format */
2230 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2232 /* xgettext: c-format */
2233 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2234 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2235 bfd_get_filename (obfd));
2237 bfd_set_error (bfd_error_wrong_format);
2243 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2245 /* Set up the arch and fields as well as these are probably wrong. */
2246 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2250 /* Check the interworking support. */
2251 if (INTERWORK_SET (ibfd))
2253 if (INTERWORK_SET (obfd))
2255 /* If the src and dest differ in their interworking issue a warning. */
2256 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2260 if (INTERWORK_FLAG (ibfd))
2261 /* xgettext: c-format */
2262 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2264 /* xgettext: c-format */
2265 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2267 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2268 bfd_get_filename (obfd));
2273 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2280 /* Display the flags field. */
2283 coff_arm_print_private_bfd_data (abfd, ptr)
2287 FILE * file = (FILE *) ptr;
2289 BFD_ASSERT (abfd != NULL && ptr != NULL);
2291 /* xgettext:c-format */
2292 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2294 if (APCS_SET (abfd))
2296 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2297 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2299 if (APCS_FLOAT_FLAG (abfd))
2300 fprintf (file, _(" [floats passed in float registers]"));
2302 fprintf (file, _(" [floats passed in integer registers]"));
2304 if (PIC_FLAG (abfd))
2305 fprintf (file, _(" [position independent]"));
2307 fprintf (file, _(" [absolute position]"));
2310 if (! INTERWORK_SET (abfd))
2311 fprintf (file, _(" [interworking flag not initialised]"));
2312 else if (INTERWORK_FLAG (abfd))
2313 fprintf (file, _(" [interworking supported]"));
2315 fprintf (file, _(" [interworking not supported]"));
2322 /* Copies the given flags into the coff_tdata.flags field.
2323 Typically these flags come from the f_flags[] field of
2324 the COFF filehdr structure, which contains important,
2325 target specific information.
2326 Note: Although this function is static, it is explicitly
2327 called from both coffcode.h and peicode.h. */
2330 _bfd_coff_arm_set_private_flags (abfd, flags)
2336 BFD_ASSERT (abfd != NULL);
2338 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2340 /* Make sure that the APCS field has not been initialised to the opposite
2343 && ( (APCS_26_FLAG (abfd) != flag)
2344 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2345 || (PIC_FLAG (abfd) != (flags & F_PIC))
2349 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2351 SET_APCS_FLAGS (abfd, flag);
2353 flag = (flags & F_INTERWORK);
2355 /* If the BFD has already had its interworking flag set, but it
2356 is different from the value that we have been asked to set,
2357 then assume that that merged code will not support interworking
2358 and set the flag accordingly. */
2359 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2362 /* xgettext: c-format */
2363 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2364 bfd_get_filename (abfd));
2366 /* xgettext: c-format */
2367 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2368 bfd_get_filename (abfd));
2372 SET_INTERWORK_FLAG (abfd, flag);
2377 /* Copy the important parts of the target specific data
2378 from one instance of a BFD to another. */
2381 coff_arm_copy_private_bfd_data (src, dest)
2385 BFD_ASSERT (src != NULL && dest != NULL);
2390 /* If the destination is not in the same format as the source, do not do
2392 if (src->xvec != dest->xvec)
2395 /* copy the flags field */
2398 if (APCS_SET (dest))
2400 /* If the src and dest have different APCS flag bits set, fail. */
2401 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2404 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2407 if (PIC_FLAG (dest) != PIC_FLAG (src))
2411 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2415 if (INTERWORK_SET (src))
2417 if (INTERWORK_SET (dest))
2419 /* If the src and dest have different interworking flags then turn
2420 off the interworking bit. */
2421 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2423 if (INTERWORK_FLAG (dest))
2425 /* xgettext:c-format */
2426 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2427 bfd_get_filename (dest),
2428 bfd_get_filename (src));
2431 SET_INTERWORK_FLAG (dest, 0);
2436 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2443 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2444 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2445 #define LOCAL_LABEL_PREFIX ""
2446 #ifndef USER_LABEL_PREFIX
2447 #define USER_LABEL_PREFIX "_"
2450 /* Like _bfd_coff_is_local_label_name, but
2451 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2453 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2454 labels of the form Lxxx to be stripped. */
2456 coff_arm_is_local_label_name (abfd, name)
2457 bfd * abfd ATTRIBUTE_UNUSED;
2460 #ifdef USER_LABEL_PREFIX
2461 if (USER_LABEL_PREFIX[0] != 0)
2463 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2468 #ifdef LOCAL_LABEL_PREFIX
2469 /* If there is a prefix for local labels then look for this.
2470 If the prefix exists, but it is empty, then ignore the test. */
2472 if (LOCAL_LABEL_PREFIX[0] != 0)
2474 int len = strlen (LOCAL_LABEL_PREFIX);
2476 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2479 /* Perform the checks below for the rest of the name. */
2484 return name[0] == 'L';
2487 /* This piece of machinery exists only to guarantee that the bfd that holds
2488 the glue section is written last.
2490 This does depend on bfd_make_section attaching a new section to the
2491 end of the section list for the bfd.
2496 coff_arm_link_output_has_begun (sub, info)
2498 struct coff_final_link_info * info;
2500 return (sub->output_has_begun
2501 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2505 coff_arm_final_link_postscript (abfd, pfinfo)
2506 bfd * abfd ATTRIBUTE_UNUSED;
2507 struct coff_final_link_info * pfinfo;
2509 struct coff_arm_link_hash_table * globals;
2511 globals = coff_arm_hash_table (pfinfo->info);
2513 BFD_ASSERT (globals != NULL);
2515 if (globals->bfd_of_glue_owner != NULL)
2517 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2520 globals->bfd_of_glue_owner->output_has_begun = true;
2526 #include "coffcode.h"
2528 #ifndef TARGET_LITTLE_SYM
2529 #define TARGET_LITTLE_SYM armcoff_little_vec
2531 #ifndef TARGET_LITTLE_NAME
2532 #define TARGET_LITTLE_NAME "coff-arm-little"
2534 #ifndef TARGET_BIG_SYM
2535 #define TARGET_BIG_SYM armcoff_big_vec
2537 #ifndef TARGET_BIG_NAME
2538 #define TARGET_BIG_NAME "coff-arm-big"
2541 #ifndef TARGET_UNDERSCORE
2542 #define TARGET_UNDERSCORE 0
2545 #ifndef EXTRA_S_FLAGS
2547 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2549 #define EXTRA_S_FLAGS 0
2553 /* Forward declaration for use initialising alternative_target field. */
2554 extern const bfd_target TARGET_BIG_SYM ;
2556 /* Target vectors. */
2557 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2558 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)