1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004
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) \
40 (coff_data (abfd)->flags & F_APCS_26)
42 #define APCS_FLOAT_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_APCS_FLOAT)
45 #define PIC_FLAG(abfd) \
46 (coff_data (abfd)->flags & F_PIC)
48 #define APCS_SET(abfd) \
49 (coff_data (abfd)->flags & F_APCS_SET)
51 #define SET_APCS_FLAGS(abfd, flgs) \
54 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
55 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
59 #define INTERWORK_FLAG(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK)
62 #define INTERWORK_SET(abfd) \
63 (coff_data (abfd)->flags & F_INTERWORK_SET)
65 #define SET_INTERWORK_FLAG(abfd, flg) \
68 coff_data (abfd)->flags &= ~F_INTERWORK; \
69 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
74 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
77 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
78 /* some typedefs for holding instructions */
79 typedef unsigned long int insn32;
80 typedef unsigned short int insn16;
82 /* Forward declarations for stupid compilers. */
83 static bfd_boolean coff_arm_relocate_section
84 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
85 struct internal_reloc *, struct internal_syment *, asection **));
86 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
87 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
88 static bfd_reloc_status_type aoutarm_fix_pcrel_26
89 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
91 static bfd_reloc_status_type coff_thumb_pcrel_23
92 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
93 static bfd_reloc_status_type coff_thumb_pcrel_9
94 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
95 static insn32 insert_thumb_branch
96 PARAMS ((insn32, int));
98 static bfd_reloc_status_type coff_thumb_pcrel_12
99 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
100 static bfd_reloc_status_type coff_arm_reloc
101 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
102 static bfd_boolean coff_arm_adjust_symndx
103 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
104 asection *, struct internal_reloc *, bfd_boolean *));
105 static reloc_howto_type * coff_arm_rtype_to_howto
106 PARAMS ((bfd *, asection *, struct internal_reloc *,
107 struct coff_link_hash_entry *, struct internal_syment *,
109 static bfd_reloc_status_type coff_thumb_pcrel_common
110 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
111 thumb_pcrel_branchtype));
112 static const struct reloc_howto_struct * coff_arm_reloc_type_lookup
113 PARAMS ((bfd *, bfd_reloc_code_real_type));
114 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
116 static struct coff_link_hash_entry * find_thumb_glue
117 PARAMS ((struct bfd_link_info *, const char *, bfd *));
118 static struct coff_link_hash_entry * find_arm_glue
119 PARAMS ((struct bfd_link_info *, const char *, bfd *));
120 #ifndef COFF_IMAGE_WITH_PE
121 static void record_arm_to_thumb_glue
122 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
124 static void record_thumb_to_arm_glue
125 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
128 static bfd_boolean coff_arm_merge_private_bfd_data
129 PARAMS ((bfd *, bfd *));
130 static bfd_boolean coff_arm_print_private_bfd_data
131 PARAMS ((bfd *, PTR));
132 static bfd_boolean _bfd_coff_arm_set_private_flags
133 PARAMS ((bfd *, flagword));
134 static bfd_boolean coff_arm_copy_private_bfd_data
135 PARAMS ((bfd *, bfd *));
136 static bfd_boolean coff_arm_is_local_label_name
137 PARAMS ((bfd *, const char *));
138 static bfd_boolean coff_arm_link_output_has_begun
139 PARAMS ((bfd *, struct coff_final_link_info *));
140 static bfd_boolean coff_arm_final_link_postscript
141 PARAMS ((bfd *, struct coff_final_link_info *));
142 static void arm_emit_base_file_entry
143 PARAMS ((struct bfd_link_info *, bfd *, asection *, bfd_vma));
145 /* The linker script knows the section names for placement.
146 The entry_names are used to do simple name mangling on the stubs.
147 Given a function name, and its type, the stub can be found. The
148 name can be changed. The only requirement is the %s be present. */
150 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
151 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
153 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
154 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
156 /* Used by the assembler. */
158 static bfd_reloc_status_type
159 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
162 arelent *reloc_entry;
163 asymbol *symbol ATTRIBUTE_UNUSED;
165 asection *input_section ATTRIBUTE_UNUSED;
167 char **error_message ATTRIBUTE_UNUSED;
170 if (output_bfd == (bfd *) NULL)
171 return bfd_reloc_continue;
173 diff = reloc_entry->addend;
176 x = ((x & ~howto->dst_mask) \
177 | (((x & howto->src_mask) + diff) & howto->dst_mask))
181 reloc_howto_type *howto = reloc_entry->howto;
182 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
188 char x = bfd_get_8 (abfd, addr);
190 bfd_put_8 (abfd, x, addr);
196 short x = bfd_get_16 (abfd, addr);
198 bfd_put_16 (abfd, (bfd_vma) x, addr);
204 long x = bfd_get_32 (abfd, addr);
206 bfd_put_32 (abfd, (bfd_vma) x, addr);
215 /* Now let bfd_perform_relocation finish everything up. */
216 return bfd_reloc_continue;
219 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
220 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
222 #ifndef TARGET_UNDERSCORE
223 #define TARGET_UNDERSCORE '_'
227 #define PCRELOFFSET TRUE
230 /* These most certainly belong somewhere else. Just had to get rid of
231 the manifest constants in the code. */
244 #define ARM_THUMB9 12
245 #define ARM_THUMB12 13
246 #define ARM_THUMB23 14
259 #define ARM_THUMB12 4
260 #define ARM_SECTION 14
261 #define ARM_SECREL 15
264 static reloc_howto_type aoutarm_std_reloc_howto[] =
273 complain_overflow_dont,
274 aoutarm_fix_pcrel_26_done,
286 complain_overflow_bitfield,
299 complain_overflow_bitfield,
312 complain_overflow_signed,
313 aoutarm_fix_pcrel_26 ,
325 complain_overflow_signed,
326 coff_thumb_pcrel_12 ,
347 complain_overflow_bitfield,
360 complain_overflow_bitfield,
367 #else /* not ARM_WINCE */
368 HOWTO (ARM_8, /* type */
372 FALSE, /* pc_relative */
374 complain_overflow_bitfield, /* complain_on_overflow */
375 coff_arm_reloc, /* special_function */
377 TRUE, /* partial_inplace */
378 0x000000ff, /* src_mask */
379 0x000000ff, /* dst_mask */
380 PCRELOFFSET /* pcrel_offset */),
387 complain_overflow_bitfield,
400 complain_overflow_bitfield,
413 complain_overflow_signed,
414 aoutarm_fix_pcrel_26 ,
426 complain_overflow_signed,
439 complain_overflow_signed,
452 complain_overflow_signed,
465 complain_overflow_dont,
466 aoutarm_fix_pcrel_26_done,
480 complain_overflow_bitfield,
493 complain_overflow_bitfield,
506 complain_overflow_bitfield,
519 complain_overflow_signed,
532 complain_overflow_signed,
533 coff_thumb_pcrel_12 ,
545 complain_overflow_signed,
546 coff_thumb_pcrel_23 ,
552 #endif /* not ARM_WINCE */
555 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
558 static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
559 /* Return TRUE if this relocation should
560 appear in the output .reloc section. */
563 in_reloc_p (abfd, howto)
564 bfd * abfd ATTRIBUTE_UNUSED;
565 reloc_howto_type * howto;
567 return !howto->pc_relative && howto->type != ARM_RVA32;
571 #define RTYPE2HOWTO(cache_ptr, dst) \
572 (cache_ptr)->howto = \
573 (dst)->r_type < NUM_RELOCS \
574 ? aoutarm_std_reloc_howto + (dst)->r_type \
577 #define coff_rtype_to_howto coff_arm_rtype_to_howto
579 static reloc_howto_type *
580 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
581 bfd *abfd ATTRIBUTE_UNUSED;
583 struct internal_reloc *rel;
584 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
585 struct internal_syment *sym ATTRIBUTE_UNUSED;
588 reloc_howto_type * howto;
590 if (rel->r_type >= NUM_RELOCS)
593 howto = aoutarm_std_reloc_howto + rel->r_type;
595 if (rel->r_type == ARM_RVA32)
596 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
601 /* Used by the assembler. */
603 static bfd_reloc_status_type
604 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
605 output_bfd, error_message)
606 bfd *abfd ATTRIBUTE_UNUSED;
607 arelent *reloc_entry ATTRIBUTE_UNUSED;
608 asymbol *symbol ATTRIBUTE_UNUSED;
609 PTR data ATTRIBUTE_UNUSED;
610 asection *input_section ATTRIBUTE_UNUSED;
611 bfd *output_bfd ATTRIBUTE_UNUSED;
612 char **error_message ATTRIBUTE_UNUSED;
614 /* This is dead simple at present. */
618 /* Used by the assembler. */
620 static bfd_reloc_status_type
621 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
622 output_bfd, error_message)
624 arelent *reloc_entry;
627 asection *input_section;
629 char **error_message ATTRIBUTE_UNUSED;
632 bfd_size_type addr = reloc_entry->address;
633 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
634 bfd_reloc_status_type flag = bfd_reloc_ok;
636 /* If this is an undefined symbol, return error. */
637 if (symbol->section == &bfd_und_section
638 && (symbol->flags & BSF_WEAK) == 0)
639 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
641 /* If the sections are different, and we are doing a partial relocation,
642 just ignore it for now. */
643 if (symbol->section->name != input_section->name
644 && output_bfd != (bfd *)NULL)
645 return bfd_reloc_continue;
647 relocation = (target & 0x00ffffff) << 2;
648 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
649 relocation += symbol->value;
650 relocation += symbol->section->output_section->vma;
651 relocation += symbol->section->output_offset;
652 relocation += reloc_entry->addend;
653 relocation -= input_section->output_section->vma;
654 relocation -= input_section->output_offset;
658 return bfd_reloc_overflow;
660 /* Check for overflow. */
661 if (relocation & 0x02000000)
663 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
664 flag = bfd_reloc_overflow;
666 else if (relocation & ~(bfd_vma) 0x03ffffff)
667 flag = bfd_reloc_overflow;
669 target &= ~0x00ffffff;
670 target |= (relocation >> 2) & 0x00ffffff;
671 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
673 /* Now the ARM magic... Change the reloc type so that it is marked as done.
674 Strictly this is only necessary if we are doing a partial relocation. */
675 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
680 static bfd_reloc_status_type
681 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
682 output_bfd, error_message, btype)
684 arelent *reloc_entry;
687 asection *input_section;
689 char **error_message ATTRIBUTE_UNUSED;
690 thumb_pcrel_branchtype btype;
692 bfd_vma relocation = 0;
693 bfd_size_type addr = reloc_entry->address;
694 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
695 bfd_reloc_status_type flag = bfd_reloc_ok;
700 /* NOTE: This routine is currently used by GAS, but not by the link
708 signbit = 0x00000100;
714 signbit = 0x00000800;
720 signbit = 0x00400000;
727 /* If this is an undefined symbol, return error. */
728 if (symbol->section == &bfd_und_section
729 && (symbol->flags & BSF_WEAK) == 0)
730 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
732 /* If the sections are different, and we are doing a partial relocation,
733 just ignore it for now. */
734 if (symbol->section->name != input_section->name
735 && output_bfd != (bfd *)NULL)
736 return bfd_reloc_continue;
742 relocation = ((target & dstmsk) << 1);
746 if (bfd_big_endian (abfd))
747 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
749 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
756 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
757 relocation += symbol->value;
758 relocation += symbol->section->output_section->vma;
759 relocation += symbol->section->output_offset;
760 relocation += reloc_entry->addend;
761 relocation -= input_section->output_section->vma;
762 relocation -= input_section->output_offset;
766 return bfd_reloc_overflow;
768 /* Check for overflow. */
769 if (relocation & signbit)
771 if ((relocation & ~offmsk) != ~offmsk)
772 flag = bfd_reloc_overflow;
774 else if (relocation & ~offmsk)
775 flag = bfd_reloc_overflow;
782 target |= (relocation >> 1);
786 if (bfd_big_endian (abfd))
787 target |= (((relocation & 0xfff) >> 1)
788 | ((relocation << 4) & 0x07ff0000));
790 target |= (((relocation & 0xffe) << 15)
791 | ((relocation >> 12) & 0x7ff));
798 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
800 /* Now the ARM magic... Change the reloc type so that it is marked as done.
801 Strictly this is only necessary if we are doing a partial relocation. */
802 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
804 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
809 static bfd_reloc_status_type
810 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
811 output_bfd, error_message)
813 arelent *reloc_entry;
816 asection *input_section;
818 char **error_message;
820 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
821 input_section, output_bfd, error_message,
825 static bfd_reloc_status_type
826 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
827 output_bfd, error_message)
829 arelent *reloc_entry;
832 asection *input_section;
834 char **error_message;
836 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
837 input_section, output_bfd, error_message,
840 #endif /* not ARM_WINCE */
842 static bfd_reloc_status_type
843 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
844 output_bfd, error_message)
846 arelent *reloc_entry;
849 asection *input_section;
851 char **error_message;
853 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
854 input_section, output_bfd, error_message,
858 static const struct reloc_howto_struct *
859 coff_arm_reloc_type_lookup (abfd, code)
861 bfd_reloc_code_real_type code;
863 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
865 if (code == BFD_RELOC_CTOR)
866 switch (bfd_get_arch_info (abfd)->bits_per_address)
872 return (const struct reloc_howto_struct *) 0;
878 ASTD (BFD_RELOC_32, ARM_32);
879 ASTD (BFD_RELOC_RVA, ARM_RVA32);
880 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
881 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
883 ASTD (BFD_RELOC_8, ARM_8);
884 ASTD (BFD_RELOC_16, ARM_16);
885 ASTD (BFD_RELOC_32, ARM_32);
886 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
887 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
888 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
889 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
890 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
891 ASTD (BFD_RELOC_RVA, ARM_RVA32);
892 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
893 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
894 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
895 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
897 default: return (const struct reloc_howto_struct *) 0;
901 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
902 #define COFF_PAGE_SIZE 0x1000
903 /* Turn a howto into a reloc nunmber */
905 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
906 #define BADMAG(x) ARMBADMAG(x)
907 #define ARM 1 /* Customize coffcode.h */
910 /* Make sure that the 'r_offset' field is copied properly
911 so that identical binaries will compare the same. */
912 #define SWAP_IN_RELOC_OFFSET H_GET_32
913 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
916 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
917 This allows us to store global data here without actually creating any
918 global variables, which is a no-no in the BFD world. */
919 struct coff_arm_link_hash_table
921 /* The original coff_link_hash_table structure. MUST be first field. */
922 struct coff_link_hash_table root;
924 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
925 bfd_size_type thumb_glue_size;
927 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
928 bfd_size_type arm_glue_size;
930 /* An arbitrary input BFD chosen to hold the glue sections. */
931 bfd * bfd_of_glue_owner;
933 /* Support interworking with old, non-interworking aware ARM code. */
934 int support_old_code;
937 /* Get the ARM coff linker hash table from a link_info structure. */
938 #define coff_arm_hash_table(info) \
939 ((struct coff_arm_link_hash_table *) ((info)->hash))
941 /* Create an ARM coff linker hash table. */
943 static struct bfd_link_hash_table *
944 coff_arm_link_hash_table_create (abfd)
947 struct coff_arm_link_hash_table * ret;
948 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
950 ret = (struct coff_arm_link_hash_table *) bfd_malloc (amt);
951 if (ret == (struct coff_arm_link_hash_table *) NULL)
954 if (! _bfd_coff_link_hash_table_init
955 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
958 return (struct bfd_link_hash_table *) NULL;
961 ret->thumb_glue_size = 0;
962 ret->arm_glue_size = 0;
963 ret->bfd_of_glue_owner = NULL;
965 return & ret->root.root;
969 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
970 struct bfd_link_info *info;
972 asection *input_section;
973 bfd_vma reloc_offset;
975 bfd_vma addr = reloc_offset
977 + input_section->output_offset
978 + input_section->output_section->vma;
980 if (coff_data (output_bfd)->pe)
981 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
982 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
987 /* The thumb form of a long branch is a bit finicky, because the offset
988 encoding is split over two fields, each in it's own instruction. They
989 can occur in any order. So given a thumb form of long branch, and an
990 offset, insert the offset into the thumb branch and return finished
993 It takes two thumb instructions to encode the target address. Each has
994 11 bits to invest. The upper 11 bits are stored in one (identified by
995 H-0.. see below), the lower 11 bits are stored in the other (identified
998 Combine together and shifted left by 1 (it's a half word address) and
1002 H-0, upper address-0 = 000
1004 H-1, lower address-0 = 800
1006 They can be ordered either way, but the arm tools I've seen always put
1007 the lower one first. It probably doesn't matter. krk@cygnus.com
1009 XXX: Actually the order does matter. The second instruction (H-1)
1010 moves the computed address into the PC, so it must be the second one
1011 in the sequence. The problem, however is that whilst little endian code
1012 stores the instructions in HI then LOW order, big endian code does the
1013 reverse. nickc@cygnus.com. */
1015 #define LOW_HI_ORDER 0xF800F000
1016 #define HI_LOW_ORDER 0xF000F800
1019 insert_thumb_branch (br_insn, rel_off)
1023 unsigned int low_bits;
1024 unsigned int high_bits;
1026 BFD_ASSERT((rel_off & 1) != 1);
1028 rel_off >>= 1; /* half word aligned address */
1029 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
1030 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
1032 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1033 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1034 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1035 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1037 /* FIXME: the BFD library should never abort except for internal errors
1038 - it should return an error status. */
1039 abort (); /* Error - not a valid branch instruction form. */
1045 static struct coff_link_hash_entry *
1046 find_thumb_glue (info, name, input_bfd)
1047 struct bfd_link_info *info;
1052 struct coff_link_hash_entry *myh;
1053 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1055 tmp_name = (char *) bfd_malloc (amt);
1057 BFD_ASSERT (tmp_name);
1059 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1061 myh = coff_link_hash_lookup
1062 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1065 /* xgettext:c-format */
1066 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
1067 bfd_archive_filename (input_bfd), tmp_name, name);
1073 #endif /* not ARM_WINCE */
1075 static struct coff_link_hash_entry *
1076 find_arm_glue (info, name, input_bfd)
1077 struct bfd_link_info *info;
1082 struct coff_link_hash_entry * myh;
1083 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1085 tmp_name = (char *) bfd_malloc (amt);
1087 BFD_ASSERT (tmp_name);
1089 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1091 myh = coff_link_hash_lookup
1092 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1095 /* xgettext:c-format */
1096 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
1097 bfd_archive_filename (input_bfd), tmp_name, name);
1109 ldr r12, __func_addr
1112 .word func @ behave as if you saw a ARM_32 reloc
1115 #define ARM2THUMB_GLUE_SIZE 12
1116 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1117 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1118 static const insn32 a2t3_func_addr_insn = 0x00000001;
1121 Thumb->ARM: Thumb->(non-interworking aware) ARM
1125 __func_from_thumb: __func_from_thumb:
1127 nop ldr r6, __func_addr
1129 __func_change_to_arm: bx r6
1131 __func_back_to_thumb:
1138 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1139 static const insn16 t2a1_bx_pc_insn = 0x4778;
1140 static const insn16 t2a2_noop_insn = 0x46c0;
1141 static const insn32 t2a3_b_insn = 0xea000000;
1143 static const insn16 t2a1_push_insn = 0xb540;
1144 static const insn16 t2a2_ldr_insn = 0x4e03;
1145 static const insn16 t2a3_mov_insn = 0x46fe;
1146 static const insn16 t2a4_bx_insn = 0x4730;
1147 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1148 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1151 We should really create new local (static) symbols in destination
1152 object for each stub we create. We should also create local
1153 (static) symbols within the stubs when switching between ARM and
1154 Thumb code. This will ensure that the debugger and disassembler
1155 can present a better view of stubs.
1157 We can treat stubs like literal sections, and for the THUMB9 ones
1158 (short addressing range) we should be able to insert the stubs
1159 between sections. i.e. the simplest approach (since relocations
1160 are done on a section basis) is to dump the stubs at the end of
1161 processing a section. That way we can always try and minimise the
1162 offset to and from a stub. However, this does not map well onto
1163 the way that the linker/BFD does its work: mapping all input
1164 sections to output sections via the linker script before doing
1167 Unfortunately it may be easier to just to disallow short range
1168 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1169 only branch-and-link (BL) calls. This will simplify the processing
1170 since we can then put all of the stubs into their own section.
1173 On a different subject, rather than complaining when a
1174 branch cannot fit in the number of bits available for the
1175 instruction we should generate a trampoline stub (needed to
1176 address the complete 32bit address space). */
1178 /* The standard COFF backend linker does not cope with the special
1179 Thumb BRANCH23 relocation. The alternative would be to split the
1180 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1181 bit simpler simply providing our own relocation driver. */
1183 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1184 This code is a very slightly modified copy of
1185 _bfd_coff_generic_relocate_section. It would be a much more
1186 maintainable solution to have a MACRO that could be expanded within
1187 _bfd_coff_generic_relocate_section that would only be provided for
1188 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1189 is different from the original. */
1192 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1193 contents, relocs, syms, sections)
1195 struct bfd_link_info *info;
1197 asection *input_section;
1199 struct internal_reloc *relocs;
1200 struct internal_syment *syms;
1201 asection **sections;
1203 struct internal_reloc * rel;
1204 struct internal_reloc * relend;
1207 relend = rel + input_section->reloc_count;
1209 for (; rel < relend; rel++)
1213 struct coff_link_hash_entry * h;
1214 struct internal_syment * sym;
1217 reloc_howto_type * howto;
1218 bfd_reloc_status_type rstat;
1221 symndx = rel->r_symndx;
1230 h = obj_coff_sym_hashes (input_bfd)[symndx];
1231 sym = syms + symndx;
1234 /* COFF treats common symbols in one of two ways. Either the
1235 size of the symbol is included in the section contents, or it
1236 is not. We assume that the size is not included, and force
1237 the rtype_to_howto function to adjust the addend as needed. */
1239 if (sym != NULL && sym->n_scnum != 0)
1240 addend = - sym->n_value;
1244 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1249 /* The relocation_section function will skip pcrel_offset relocs
1250 when doing a relocatable link. However, we want to convert
1251 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1252 this case without pcrel_offset set, and adjust the addend to
1253 compensate. 'partial_inplace' is also set, since we want 'done'
1254 relocations to be reflected in section's data. */
1255 if (rel->r_type == ARM_26
1257 && info->relocatable
1258 && (h->root.type == bfd_link_hash_defined
1259 || h->root.type == bfd_link_hash_defweak)
1260 && (h->root.u.def.section->output_section
1261 == input_section->output_section))
1263 static reloc_howto_type fake_arm26_reloc =
1270 complain_overflow_signed,
1271 aoutarm_fix_pcrel_26 ,
1278 addend -= rel->r_vaddr - input_section->vma;
1280 /* FIXME: I don't know why, but the hack is necessary for correct
1281 generation of bl's instruction offset. */
1284 howto = &fake_arm26_reloc;
1288 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1289 the next opcode's pc, so is off by one. */
1290 #if 0 /* This appears to have been true for WINCE 2.0, but it is not
1291 true for WINCE 3.0. */
1292 if (howto->pc_relative && !info->relocatable)
1297 /* If we are doing a relocatable link, then we can just ignore
1298 a PC relative reloc that is pcrel_offset. It will already
1299 have the correct value. If this is not a relocatable link,
1300 then we should ignore the symbol value. */
1301 if (howto->pc_relative && howto->pcrel_offset)
1303 if (info->relocatable)
1305 /* FIXME - it is not clear which targets need this next test
1306 and which do not. It is known that it is needed for the
1307 VxWorks and EPOC-PE targets, but it is also known that it
1308 was suppressed for other ARM targets. This ought to be
1309 sorted out one day. */
1310 #ifdef ARM_COFF_BUGFIX
1311 /* We must not ignore the symbol value. If the symbol is
1312 within the same section, the relocation should have already
1313 been fixed, but if it is not, we'll be handed a reloc into
1314 the beginning of the symbol's section, so we must not cancel
1315 out the symbol's value, otherwise we'll be adding it in
1317 if (sym != NULL && sym->n_scnum != 0)
1318 addend += sym->n_value;
1330 sec = bfd_abs_section_ptr;
1335 sec = sections[symndx];
1336 val = (sec->output_section->vma
1337 + sec->output_offset
1344 #if 1 /* THUMBEXTENSION */
1345 /* We don't output the stubs if we are generating a
1346 relocatable output file, since we may as well leave the
1347 stub generation to the final linker pass. If we fail to
1348 verify that the name is defined, we'll try to build stubs
1349 for an undefined name... */
1350 if (! info->relocatable
1351 && ( h->root.type == bfd_link_hash_defined
1352 || h->root.type == bfd_link_hash_defweak))
1354 asection * h_sec = h->root.u.def.section;
1355 const char * name = h->root.root.string;
1357 /* h locates the symbol referenced in the reloc. */
1358 h_val = (h->root.u.def.value
1359 + h_sec->output_section->vma
1360 + h_sec->output_offset);
1362 if (howto->type == ARM_26)
1364 if ( h->class == C_THUMBSTATFUNC
1365 || h->class == C_THUMBEXTFUNC)
1367 /* Arm code calling a Thumb function. */
1368 unsigned long int tmp;
1371 long int ret_offset;
1372 struct coff_link_hash_entry * myh;
1373 struct coff_arm_link_hash_table * globals;
1375 myh = find_arm_glue (info, name, input_bfd);
1379 globals = coff_arm_hash_table (info);
1381 BFD_ASSERT (globals != NULL);
1382 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1384 my_offset = myh->root.u.def.value;
1386 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1387 ARM2THUMB_GLUE_SECTION_NAME);
1388 BFD_ASSERT (s != NULL);
1389 BFD_ASSERT (s->contents != NULL);
1390 BFD_ASSERT (s->output_section != NULL);
1392 if ((my_offset & 0x01) == 0x01)
1394 if (h_sec->owner != NULL
1395 && INTERWORK_SET (h_sec->owner)
1396 && ! INTERWORK_FLAG (h_sec->owner))
1399 /* xgettext:c-format */
1400 (_("%s(%s): warning: interworking not enabled."),
1401 bfd_archive_filename (h_sec->owner), name);
1403 /* xgettext:c-format */
1404 (_(" first occurrence: %s: arm call to thumb"),
1405 bfd_archive_filename (input_bfd));
1409 myh->root.u.def.value = my_offset;
1411 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1412 s->contents + my_offset);
1414 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1415 s->contents + my_offset + 4);
1417 /* It's a thumb address. Add the low order bit. */
1418 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1419 s->contents + my_offset + 8);
1421 if (info->base_file)
1422 arm_emit_base_file_entry (info, output_bfd, s,
1427 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1429 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1430 - input_section->vma);
1432 tmp = tmp & 0xFF000000;
1434 /* Somehow these are both 4 too far, so subtract 8. */
1438 + s->output_section->vma
1439 - (input_section->output_offset
1440 + input_section->output_section->vma
1444 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1446 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1447 contents + rel->r_vaddr - input_section->vma);
1453 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1454 else if (howto->type == ARM_THUMB23)
1456 if ( h->class == C_EXT
1457 || h->class == C_STAT
1458 || h->class == C_LABEL)
1460 /* Thumb code calling an ARM function */
1463 unsigned long int tmp;
1464 long int ret_offset;
1465 struct coff_link_hash_entry * myh;
1466 struct coff_arm_link_hash_table * globals;
1468 myh = find_thumb_glue (info, name, input_bfd);
1472 globals = coff_arm_hash_table (info);
1474 BFD_ASSERT (globals != NULL);
1475 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1477 my_offset = myh->root.u.def.value;
1479 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1480 THUMB2ARM_GLUE_SECTION_NAME);
1482 BFD_ASSERT (s != NULL);
1483 BFD_ASSERT (s->contents != NULL);
1484 BFD_ASSERT (s->output_section != NULL);
1486 if ((my_offset & 0x01) == 0x01)
1488 if (h_sec->owner != NULL
1489 && INTERWORK_SET (h_sec->owner)
1490 && ! INTERWORK_FLAG (h_sec->owner)
1491 && ! globals->support_old_code)
1494 /* xgettext:c-format */
1495 (_("%s(%s): warning: interworking not enabled."),
1496 bfd_archive_filename (h_sec->owner), name);
1498 /* xgettext:c-format */
1499 (_(" first occurrence: %s: thumb call to arm"),
1500 bfd_archive_filename (input_bfd));
1502 (_(" consider relinking with --support-old-code enabled"));
1506 myh->root.u.def.value = my_offset;
1508 if (globals->support_old_code)
1510 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1511 s->contents + my_offset);
1513 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1514 s->contents + my_offset + 2);
1516 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1517 s->contents + my_offset + 4);
1519 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1520 s->contents + my_offset + 6);
1522 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1523 s->contents + my_offset + 8);
1525 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1526 s->contents + my_offset + 12);
1528 /* Store the address of the function in the last word of the stub. */
1529 bfd_put_32 (output_bfd, h_val,
1530 s->contents + my_offset + 16);
1532 if (info->base_file)
1533 arm_emit_base_file_entry (info, output_bfd, s,
1538 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1539 s->contents + my_offset);
1541 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1542 s->contents + my_offset + 2);
1545 ((bfd_signed_vma) h_val) /* Address of destination of the stub. */
1547 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1548 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1549 + s->output_section->vma) /* Address of the start of the current section. */
1550 + 4 /* The branch instruction is 4 bytes into the stub. */
1551 + 8); /* ARM branches work from the pc of the instruction + 8. */
1553 bfd_put_32 (output_bfd,
1554 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1555 s->contents + my_offset + 4);
1560 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1562 /* Now go back and fix up the original BL insn to point
1567 - (input_section->output_offset
1571 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1572 - input_section->vma);
1574 bfd_put_32 (output_bfd,
1575 (bfd_vma) insert_thumb_branch (tmp,
1577 contents + rel->r_vaddr - input_section->vma);
1585 /* If the relocation type and destination symbol does not
1586 fall into one of the above categories, then we can just
1587 perform a direct link. */
1590 rstat = bfd_reloc_ok;
1592 #endif /* THUMBEXTENSION */
1593 if ( h->root.type == bfd_link_hash_defined
1594 || h->root.type == bfd_link_hash_defweak)
1598 sec = h->root.u.def.section;
1599 val = (h->root.u.def.value
1600 + sec->output_section->vma
1601 + sec->output_offset);
1604 else if (! info->relocatable)
1606 if (! ((*info->callbacks->undefined_symbol)
1607 (info, h->root.root.string, input_bfd, input_section,
1608 rel->r_vaddr - input_section->vma, TRUE)))
1613 if (info->base_file)
1615 /* Emit a reloc if the backend thinks it needs it. */
1616 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1617 arm_emit_base_file_entry (info, output_bfd, input_section,
1621 #if 1 /* THUMBEXTENSION */
1623 rstat = bfd_reloc_ok;
1625 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1626 else if (! info->relocatable
1627 && howto->type == ARM_THUMB23)
1629 /* This is pretty much a copy of what the default
1630 _bfd_final_link_relocate and _bfd_relocate_contents
1631 routines do to perform a relocation, with special
1632 processing for the split addressing of the Thumb BL
1633 instruction. Again, it would probably be simpler adding a
1634 ThumbBRANCH23 specific macro expansion into the default
1637 bfd_vma address = rel->r_vaddr - input_section->vma;
1640 sz = (input_section->rawsize
1641 ? input_section->rawsize
1642 : input_section->size);
1644 rstat = bfd_reloc_outofrange;
1647 bfd_vma relocation = val + addend;
1648 int size = bfd_get_reloc_size (howto);
1649 bfd_boolean overflow = FALSE;
1650 bfd_byte *location = contents + address;
1651 bfd_vma x = bfd_get_32 (input_bfd, location);
1652 bfd_vma src_mask = 0x007FFFFE;
1653 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1654 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1656 bfd_signed_vma signed_check;
1658 bfd_signed_vma signed_add;
1660 BFD_ASSERT (size == 4);
1662 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1663 relocation -= (input_section->output_section->vma
1664 + input_section->output_offset);
1666 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1667 relocation -= address;
1669 /* No need to negate the relocation with BRANCH23. */
1670 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1671 /* howto->rightshift == 1 */
1673 /* Drop unwanted bits from the value we are relocating to. */
1674 check = relocation >> howto->rightshift;
1676 /* If this is a signed value, the rightshift just dropped
1677 leading 1 bits (assuming twos complement). */
1678 if ((bfd_signed_vma) relocation >= 0)
1679 signed_check = check;
1681 signed_check = (check
1683 & ~((bfd_vma) - 1 >> howto->rightshift)));
1685 /* Get the value from the object file. */
1686 if (bfd_big_endian (input_bfd))
1687 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1689 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1691 /* Get the value from the object file with an appropriate sign.
1692 The expression involving howto->src_mask isolates the upper
1693 bit of src_mask. If that bit is set in the value we are
1694 adding, it is negative, and we subtract out that number times
1695 two. If src_mask includes the highest possible bit, then we
1696 can not get the upper bit, but that does not matter since
1697 signed_add needs no adjustment to become negative in that
1701 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1702 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1704 /* howto->bitpos == 0 */
1705 /* Add the value from the object file, shifted so that it is a
1707 signed_check += signed_add;
1708 relocation += signed_add;
1710 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1712 /* Assumes two's complement. */
1713 if ( signed_check > reloc_signed_max
1714 || signed_check < reloc_signed_min)
1717 /* Put the relocation into the correct bits.
1718 For a BLX instruction, make sure that the relocation is rounded up
1719 to a word boundary. This follows the semantics of the instruction
1720 which specifies that bit 1 of the target address will come from bit
1721 1 of the base address. */
1722 if (bfd_big_endian (input_bfd))
1724 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1726 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1730 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1732 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1735 /* Add the relocation to the correct bits of X. */
1736 x = ((x & ~howto->dst_mask) | relocation);
1738 /* Put the relocated value back in the object file. */
1739 bfd_put_32 (input_bfd, x, location);
1741 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1746 #endif /* THUMBEXTENSION */
1747 if (info->relocatable && ! howto->partial_inplace)
1748 rstat = bfd_reloc_ok;
1750 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1752 rel->r_vaddr - input_section->vma,
1754 #if 1 /* THUMBEXTENSION */
1756 Is this the best way to fix up thumb addresses? krk@cygnus.com
1757 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1758 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1759 if (! info->relocatable
1760 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1762 /* Determine if we need to set the bottom bit of a relocated address
1763 because the address is the address of a Thumb code symbol. */
1765 int patchit = FALSE;
1768 && ( h->class == C_THUMBSTATFUNC
1769 || h->class == C_THUMBEXTFUNC))
1773 else if (sym != NULL
1774 && sym->n_scnum > N_UNDEF)
1776 /* No hash entry - use the symbol instead. */
1778 if ( sym->n_sclass == C_THUMBSTATFUNC
1779 || sym->n_sclass == C_THUMBEXTFUNC)
1785 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1786 bfd_vma x = bfd_get_32 (input_bfd, location);
1788 bfd_put_32 (input_bfd, x | 1, location);
1791 #endif /* THUMBEXTENSION */
1799 case bfd_reloc_outofrange:
1800 (*_bfd_error_handler)
1801 (_("%s: bad reloc address 0x%lx in section `%s'"),
1802 bfd_archive_filename (input_bfd),
1803 (unsigned long) rel->r_vaddr,
1804 bfd_get_section_name (input_bfd, input_section));
1806 case bfd_reloc_overflow:
1809 char buf[SYMNMLEN + 1];
1814 name = h->root.root.string;
1817 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1822 if (! ((*info->callbacks->reloc_overflow)
1823 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1824 input_section, rel->r_vaddr - input_section->vma)))
1833 #ifndef COFF_IMAGE_WITH_PE
1836 bfd_arm_allocate_interworking_sections (info)
1837 struct bfd_link_info * info;
1841 struct coff_arm_link_hash_table * globals;
1843 static char test_char = '1';
1846 globals = coff_arm_hash_table (info);
1848 BFD_ASSERT (globals != NULL);
1850 if (globals->arm_glue_size != 0)
1852 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1854 s = bfd_get_section_by_name
1855 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1857 BFD_ASSERT (s != NULL);
1859 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1860 globals->arm_glue_size);
1862 memset (foo, test_char, (size_t) globals->arm_glue_size);
1865 s->size = globals->arm_glue_size;
1869 if (globals->thumb_glue_size != 0)
1871 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1873 s = bfd_get_section_by_name
1874 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1876 BFD_ASSERT (s != NULL);
1878 foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner,
1879 globals->thumb_glue_size);
1881 memset (foo, test_char, (size_t) globals->thumb_glue_size);
1884 s->size = globals->thumb_glue_size;
1892 record_arm_to_thumb_glue (info, h)
1893 struct bfd_link_info * info;
1894 struct coff_link_hash_entry * h;
1896 const char * name = h->root.root.string;
1897 register asection * s;
1899 struct coff_link_hash_entry * myh;
1900 struct bfd_link_hash_entry * bh;
1901 struct coff_arm_link_hash_table * globals;
1905 globals = coff_arm_hash_table (info);
1907 BFD_ASSERT (globals != NULL);
1908 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1910 s = bfd_get_section_by_name
1911 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1913 BFD_ASSERT (s != NULL);
1915 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1916 tmp_name = (char *) bfd_malloc (amt);
1918 BFD_ASSERT (tmp_name);
1920 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1922 myh = coff_link_hash_lookup
1923 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1928 return; /* we've already seen this guy */
1931 /* The only trick here is using globals->arm_glue_size as the value. Even
1932 though the section isn't allocated yet, this is where we will be putting
1936 val = globals->arm_glue_size + 1;
1937 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1938 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1942 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1949 record_thumb_to_arm_glue (info, h)
1950 struct bfd_link_info * info;
1951 struct coff_link_hash_entry * h;
1953 const char * name = h->root.root.string;
1954 register asection * s;
1956 struct coff_link_hash_entry * myh;
1957 struct bfd_link_hash_entry * bh;
1958 struct coff_arm_link_hash_table * globals;
1962 globals = coff_arm_hash_table (info);
1964 BFD_ASSERT (globals != NULL);
1965 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1967 s = bfd_get_section_by_name
1968 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1970 BFD_ASSERT (s != NULL);
1972 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1973 tmp_name = (char *) bfd_malloc (amt);
1975 BFD_ASSERT (tmp_name);
1977 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1979 myh = coff_link_hash_lookup
1980 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1985 return; /* we've already seen this guy */
1989 val = globals->thumb_glue_size + 1;
1990 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1991 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1993 /* If we mark it 'thumb', the disassembler will do a better job. */
1994 myh = (struct coff_link_hash_entry *) bh;
1995 myh->class = C_THUMBEXTFUNC;
1999 /* Allocate another symbol to mark where we switch to arm mode. */
2001 #define CHANGE_TO_ARM "__%s_change_to_arm"
2002 #define BACK_FROM_ARM "__%s_back_from_arm"
2004 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
2005 tmp_name = (char *) bfd_malloc (amt);
2007 BFD_ASSERT (tmp_name);
2009 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
2012 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
2013 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
2014 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
2018 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
2022 #endif /* not ARM_WINCE */
2024 /* Select a BFD to be used to hold the sections used by the glue code.
2025 This function is called from the linker scripts in ld/emultempl/
2029 bfd_arm_get_bfd_for_interworking (abfd, info)
2031 struct bfd_link_info * info;
2033 struct coff_arm_link_hash_table * globals;
2037 /* If we are only performing a partial link do not bother
2038 getting a bfd to hold the glue. */
2039 if (info->relocatable)
2042 globals = coff_arm_hash_table (info);
2044 BFD_ASSERT (globals != NULL);
2046 if (globals->bfd_of_glue_owner != NULL)
2049 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2053 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2055 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
2058 || ! bfd_set_section_flags (abfd, sec, flags)
2059 || ! bfd_set_section_alignment (abfd, sec, 2))
2063 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2067 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
2069 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2072 || ! bfd_set_section_flags (abfd, sec, flags)
2073 || ! bfd_set_section_alignment (abfd, sec, 2))
2077 /* Save the bfd for later use. */
2078 globals->bfd_of_glue_owner = abfd;
2084 bfd_arm_process_before_allocation (abfd, info, support_old_code)
2086 struct bfd_link_info * info;
2087 int support_old_code;
2090 struct coff_arm_link_hash_table * globals;
2092 /* If we are only performing a partial link do not bother
2093 to construct any glue. */
2094 if (info->relocatable)
2097 /* Here we have a bfd that is to be included on the link. We have a hook
2098 to do reloc rummaging, before section sizes are nailed down. */
2100 _bfd_coff_get_external_symbols (abfd);
2102 globals = coff_arm_hash_table (info);
2104 BFD_ASSERT (globals != NULL);
2105 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2107 globals->support_old_code = support_old_code;
2109 /* Rummage around all the relocs and map the glue vectors. */
2110 sec = abfd->sections;
2115 for (; sec != NULL; sec = sec->next)
2117 struct internal_reloc * i;
2118 struct internal_reloc * rel;
2120 if (sec->reloc_count == 0)
2123 /* Load the relocs. */
2124 /* FIXME: there may be a storage leak here. */
2126 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2128 BFD_ASSERT (i != 0);
2130 for (rel = i; rel < i + sec->reloc_count; ++rel)
2132 unsigned short r_type = rel->r_type;
2134 struct coff_link_hash_entry * h;
2136 symndx = rel->r_symndx;
2138 /* If the relocation is not against a symbol it cannot concern us. */
2142 /* If the index is outside of the range of our table, something has gone wrong. */
2143 if (symndx >= obj_conv_table_size (abfd))
2145 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
2146 bfd_archive_filename (abfd), symndx);
2150 h = obj_coff_sym_hashes (abfd)[symndx];
2152 /* If the relocation is against a static symbol it must be within
2153 the current section and so cannot be a cross ARM/Thumb relocation. */
2160 /* This one is a call from arm code. We need to look up
2161 the target of the call. If it is a thumb target, we
2164 if (h->class == C_THUMBEXTFUNC)
2165 record_arm_to_thumb_glue (info, h);
2170 /* This one is a call from thumb code. We used to look
2171 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2172 up the target of the call. If it is an arm target, we
2173 insert glue. If the symbol does not exist it will be
2174 given a class of C_EXT and so we will generate a stub
2175 for it. This is not really a problem, since the link
2176 is doomed anyway. */
2183 record_thumb_to_arm_glue (info, h);
2200 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2202 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2203 #define coff_relocate_section coff_arm_relocate_section
2204 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2205 #define coff_adjust_symndx coff_arm_adjust_symndx
2206 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2207 #define coff_final_link_postscript coff_arm_final_link_postscript
2208 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2209 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2210 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2211 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2212 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2214 /* When doing a relocatable link, we want to convert ARM_26 relocs
2215 into ARM_26D relocs. */
2218 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
2219 bfd *obfd ATTRIBUTE_UNUSED;
2220 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2223 struct internal_reloc *irel;
2224 bfd_boolean *adjustedp;
2226 if (irel->r_type == ARM_26)
2228 struct coff_link_hash_entry *h;
2230 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2232 && (h->root.type == bfd_link_hash_defined
2233 || h->root.type == bfd_link_hash_defweak)
2234 && h->root.u.def.section->output_section == sec->output_section)
2235 irel->r_type = ARM_26D;
2241 /* Called when merging the private data areas of two BFDs.
2242 This is important as it allows us to detect if we are
2243 attempting to merge binaries compiled for different ARM
2244 targets, eg different CPUs or different APCS's. */
2247 coff_arm_merge_private_bfd_data (ibfd, obfd)
2251 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2256 /* If the two formats are different we cannot merge anything.
2257 This is not an error, since it is permissable to change the
2258 input and output formats. */
2259 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2260 || obfd->xvec->flavour != bfd_target_coff_flavour)
2263 /* Determine what should happen if the input ARM architecture
2264 does not match the output ARM architecture. */
2265 if (! bfd_arm_merge_machines (ibfd, obfd))
2268 /* Verify that the APCS is the same for the two BFDs. */
2269 if (APCS_SET (ibfd))
2271 if (APCS_SET (obfd))
2273 /* If the src and dest have different APCS flag bits set, fail. */
2274 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2277 /* xgettext: c-format */
2278 (_("ERROR: %s is compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2279 bfd_archive_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2280 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2283 bfd_set_error (bfd_error_wrong_format);
2287 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2291 if (APCS_FLOAT_FLAG (ibfd))
2292 /* xgettext: c-format */
2293 msg = _("ERROR: %s passes floats in float registers, whereas %s passes them in integer registers");
2295 /* xgettext: c-format */
2296 msg = _("ERROR: %s passes floats in integer registers, whereas %s passes them in float registers");
2298 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2299 bfd_get_filename (obfd));
2301 bfd_set_error (bfd_error_wrong_format);
2305 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2309 if (PIC_FLAG (ibfd))
2310 /* xgettext: c-format */
2311 msg = _("ERROR: %s is compiled as position independent code, whereas target %s is absolute position");
2313 /* xgettext: c-format */
2314 msg = _("ERROR: %s is compiled as absolute position code, whereas target %s is position independent");
2315 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2316 bfd_get_filename (obfd));
2318 bfd_set_error (bfd_error_wrong_format);
2324 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2326 /* Set up the arch and fields as well as these are probably wrong. */
2327 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2331 /* Check the interworking support. */
2332 if (INTERWORK_SET (ibfd))
2334 if (INTERWORK_SET (obfd))
2336 /* If the src and dest differ in their interworking issue a warning. */
2337 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2341 if (INTERWORK_FLAG (ibfd))
2342 /* xgettext: c-format */
2343 msg = _("Warning: %s supports interworking, whereas %s does not");
2345 /* xgettext: c-format */
2346 msg = _("Warning: %s does not support interworking, whereas %s does");
2348 _bfd_error_handler (msg, bfd_archive_filename (ibfd),
2349 bfd_get_filename (obfd));
2354 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2361 /* Display the flags field. */
2364 coff_arm_print_private_bfd_data (abfd, ptr)
2368 FILE * file = (FILE *) ptr;
2370 BFD_ASSERT (abfd != NULL && ptr != NULL);
2372 /* xgettext:c-format */
2373 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2375 if (APCS_SET (abfd))
2377 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2378 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2380 if (APCS_FLOAT_FLAG (abfd))
2381 fprintf (file, _(" [floats passed in float registers]"));
2383 fprintf (file, _(" [floats passed in integer registers]"));
2385 if (PIC_FLAG (abfd))
2386 fprintf (file, _(" [position independent]"));
2388 fprintf (file, _(" [absolute position]"));
2391 if (! INTERWORK_SET (abfd))
2392 fprintf (file, _(" [interworking flag not initialised]"));
2393 else if (INTERWORK_FLAG (abfd))
2394 fprintf (file, _(" [interworking supported]"));
2396 fprintf (file, _(" [interworking not supported]"));
2403 /* Copies the given flags into the coff_tdata.flags field.
2404 Typically these flags come from the f_flags[] field of
2405 the COFF filehdr structure, which contains important,
2406 target specific information.
2407 Note: Although this function is static, it is explicitly
2408 called from both coffcode.h and peicode.h. */
2411 _bfd_coff_arm_set_private_flags (abfd, flags)
2417 BFD_ASSERT (abfd != NULL);
2419 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2421 /* Make sure that the APCS field has not been initialised to the opposite
2424 && ( (APCS_26_FLAG (abfd) != flag)
2425 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2426 || (PIC_FLAG (abfd) != (flags & F_PIC))
2430 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2432 SET_APCS_FLAGS (abfd, flag);
2434 flag = (flags & F_INTERWORK);
2436 /* If the BFD has already had its interworking flag set, but it
2437 is different from the value that we have been asked to set,
2438 then assume that that merged code will not support interworking
2439 and set the flag accordingly. */
2440 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2443 /* xgettext: c-format */
2444 _bfd_error_handler (_("Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2445 bfd_archive_filename (abfd));
2447 /* xgettext: c-format */
2448 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2449 bfd_archive_filename (abfd));
2453 SET_INTERWORK_FLAG (abfd, flag);
2458 /* Copy the important parts of the target specific data
2459 from one instance of a BFD to another. */
2462 coff_arm_copy_private_bfd_data (src, dest)
2466 BFD_ASSERT (src != NULL && dest != NULL);
2471 /* If the destination is not in the same format as the source, do not do
2473 if (src->xvec != dest->xvec)
2476 /* copy the flags field */
2479 if (APCS_SET (dest))
2481 /* If the src and dest have different APCS flag bits set, fail. */
2482 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2485 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2488 if (PIC_FLAG (dest) != PIC_FLAG (src))
2492 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2496 if (INTERWORK_SET (src))
2498 if (INTERWORK_SET (dest))
2500 /* If the src and dest have different interworking flags then turn
2501 off the interworking bit. */
2502 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2504 if (INTERWORK_FLAG (dest))
2506 /* xgettext:c-format */
2507 _bfd_error_handler (("\
2508 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2509 bfd_get_filename (dest),
2510 bfd_archive_filename (src));
2513 SET_INTERWORK_FLAG (dest, 0);
2518 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2525 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2526 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2527 #define LOCAL_LABEL_PREFIX ""
2528 #ifndef USER_LABEL_PREFIX
2529 #define USER_LABEL_PREFIX "_"
2532 /* Like _bfd_coff_is_local_label_name, but
2533 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2535 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2536 labels of the form Lxxx to be stripped. */
2538 coff_arm_is_local_label_name (abfd, name)
2539 bfd * abfd ATTRIBUTE_UNUSED;
2542 #ifdef USER_LABEL_PREFIX
2543 if (USER_LABEL_PREFIX[0] != 0)
2545 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2550 #ifdef LOCAL_LABEL_PREFIX
2551 /* If there is a prefix for local labels then look for this.
2552 If the prefix exists, but it is empty, then ignore the test. */
2554 if (LOCAL_LABEL_PREFIX[0] != 0)
2556 size_t len = strlen (LOCAL_LABEL_PREFIX);
2558 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2561 /* Perform the checks below for the rest of the name. */
2566 return name[0] == 'L';
2569 /* This piece of machinery exists only to guarantee that the bfd that holds
2570 the glue section is written last.
2572 This does depend on bfd_make_section attaching a new section to the
2573 end of the section list for the bfd.
2578 coff_arm_link_output_has_begun (sub, info)
2580 struct coff_final_link_info * info;
2582 return (sub->output_has_begun
2583 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2587 coff_arm_final_link_postscript (abfd, pfinfo)
2588 bfd * abfd ATTRIBUTE_UNUSED;
2589 struct coff_final_link_info * pfinfo;
2591 struct coff_arm_link_hash_table * globals;
2593 globals = coff_arm_hash_table (pfinfo->info);
2595 BFD_ASSERT (globals != NULL);
2597 if (globals->bfd_of_glue_owner != NULL)
2599 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2602 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2605 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2608 #include "coffcode.h"
2610 #ifndef TARGET_LITTLE_SYM
2611 #define TARGET_LITTLE_SYM armcoff_little_vec
2613 #ifndef TARGET_LITTLE_NAME
2614 #define TARGET_LITTLE_NAME "coff-arm-little"
2616 #ifndef TARGET_BIG_SYM
2617 #define TARGET_BIG_SYM armcoff_big_vec
2619 #ifndef TARGET_BIG_NAME
2620 #define TARGET_BIG_NAME "coff-arm-big"
2623 #ifndef TARGET_UNDERSCORE
2624 #define TARGET_UNDERSCORE 0
2627 #ifndef EXTRA_S_FLAGS
2629 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2631 #define EXTRA_S_FLAGS SEC_CODE
2635 /* Forward declaration for use initialising alternative_target field. */
2636 extern const bfd_target TARGET_BIG_SYM ;
2638 /* Target vectors. */
2639 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2640 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)