1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1998
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #include "coff/internal.h"
36 /* Macros for manipulation the bits in the flags field of the coff data
38 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
39 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
40 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
41 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
42 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
43 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
44 | (flgs | F_APCS_SET))
45 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
46 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
47 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
48 (coff_data (abfd)->flags & ~ F_INTERWORK) \
49 | (flg | F_INTERWORK_SET))
51 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
52 /* some typedefs for holding instructions */
53 typedef unsigned long int insn32;
54 typedef unsigned short int insn16;
57 /* Forward declarations for stupid compilers. */
58 static boolean coff_arm_relocate_section
59 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
60 struct internal_reloc *, struct internal_syment *, asection **));
61 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
62 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
63 static bfd_reloc_status_type aoutarm_fix_pcrel_26
64 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
65 static bfd_reloc_status_type coff_thumb_pcrel_23
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type coff_thumb_pcrel_12
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_9
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_arm_reloc
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static boolean coff_arm_adjust_symndx
74 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
75 asection *, struct internal_reloc *, boolean *));
76 static reloc_howto_type * coff_arm_rtype_to_howto
77 PARAMS ((bfd *, asection *, struct internal_reloc *,
78 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
79 static bfd_reloc_status_type coff_thumb_pcrel_common
80 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
81 thumb_pcrel_branchtype));
82 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
83 PARAMS ((bfd *, bfd_reloc_code_real_type));
84 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
86 static insn32 insert_thumb_branch
87 PARAMS ((insn32, int));
88 static struct coff_link_hash_entry * find_thumb_glue
89 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
90 static struct coff_link_hash_entry * find_arm_glue
91 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
92 static void record_arm_to_thumb_glue
93 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
94 static void record_thumb_to_arm_glue
95 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
96 static boolean coff_arm_merge_private_bfd_data
97 PARAMS ((bfd *, bfd *));
98 static boolean coff_arm_print_private_bfd_data
99 PARAMS ((bfd *, PTR));
100 static boolean _bfd_coff_arm_set_private_flags
101 PARAMS ((bfd *, flagword));
102 static boolean coff_arm_copy_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_is_local_label_name
105 PARAMS ((bfd *, const char *));
106 static boolean coff_arm_link_output_has_begun
107 PARAMS ((bfd *, struct coff_final_link_info *));
108 static boolean coff_arm_final_link_postscript
109 PARAMS ((bfd *, struct coff_final_link_info *));
111 /* The linker script knows the section names for placement.
112 The entry_names are used to do simple name mangling on the stubs.
113 Given a function name, and its type, the stub can be found. The
114 name can be changed. The only requirement is the %s be present.
117 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
118 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
120 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
121 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
123 /* Used by the assembler. */
124 static bfd_reloc_status_type
125 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
128 arelent *reloc_entry;
131 asection *input_section;
133 char **error_message;
136 if (output_bfd == (bfd *) NULL)
137 return bfd_reloc_continue;
139 diff = reloc_entry->addend;
142 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
146 reloc_howto_type *howto = reloc_entry->howto;
147 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
153 char x = bfd_get_8 (abfd, addr);
155 bfd_put_8 (abfd, x, addr);
161 short x = bfd_get_16 (abfd, addr);
163 bfd_put_16 (abfd, x, addr);
169 long x = bfd_get_32 (abfd, addr);
171 bfd_put_32 (abfd, x, addr);
180 /* Now let bfd_perform_relocation finish everything up. */
181 return bfd_reloc_continue;
184 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
185 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
187 #ifndef TARGET_UNDERSCORE
188 #define TARGET_UNDERSCORE '_'
192 #define PCRELOFFSET true
195 /* These most certainly belong somewhere else. Just had to get rid of
196 the manifest constants in the code. */
210 #define ARM_THUMB9 12
211 #define ARM_THUMB12 13
212 #define ARM_THUMB23 14
214 static reloc_howto_type aoutarm_std_reloc_howto[] =
216 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
217 HOWTO(ARM_8, /* type */
221 false, /* pc_relative */
223 complain_overflow_bitfield, /* complain_on_overflow */
224 coff_arm_reloc, /* special_function */
226 true, /* partial_inplace */
227 0x000000ff, /* src_mask */
228 0x000000ff, /* dst_mask */
229 PCRELOFFSET /* pcrel_offset */),
236 complain_overflow_bitfield,
249 complain_overflow_bitfield,
262 complain_overflow_signed,
263 aoutarm_fix_pcrel_26 ,
275 complain_overflow_signed,
288 complain_overflow_signed,
301 complain_overflow_signed,
314 complain_overflow_dont,
315 aoutarm_fix_pcrel_26_done,
329 complain_overflow_bitfield,
342 complain_overflow_bitfield,
355 complain_overflow_bitfield,
368 complain_overflow_signed,
381 complain_overflow_signed,
382 coff_thumb_pcrel_12 ,
394 complain_overflow_signed,
395 coff_thumb_pcrel_23 ,
404 /* Return true if this relocation should
405 appear in the output .reloc section. */
408 in_reloc_p (abfd, howto)
410 reloc_howto_type * howto;
412 return !howto->pc_relative && howto->type != ARM_RVA32;
417 #define RTYPE2HOWTO(cache_ptr, dst) \
418 (cache_ptr)->howto = aoutarm_std_reloc_howto + (dst)->r_type;
420 #define coff_rtype_to_howto coff_arm_rtype_to_howto
422 static reloc_howto_type *
423 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
426 struct internal_reloc *rel;
427 struct coff_link_hash_entry *h;
428 struct internal_syment *sym;
431 reloc_howto_type *howto;
433 howto = aoutarm_std_reloc_howto + rel->r_type;
435 if (rel->r_type == ARM_RVA32)
437 *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
443 /* Used by the assembler. */
445 static bfd_reloc_status_type
446 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
447 output_bfd, error_message)
449 arelent *reloc_entry;
452 asection *input_section;
454 char **error_message;
456 /* This is dead simple at present. */
460 /* Used by the assembler. */
462 static bfd_reloc_status_type
463 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
464 output_bfd, error_message)
466 arelent *reloc_entry;
469 asection *input_section;
471 char **error_message;
474 bfd_size_type addr = reloc_entry->address;
475 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
476 bfd_reloc_status_type flag = bfd_reloc_ok;
478 /* If this is an undefined symbol, return error */
479 if (symbol->section == &bfd_und_section
480 && (symbol->flags & BSF_WEAK) == 0)
481 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
483 /* If the sections are different, and we are doing a partial relocation,
484 just ignore it for now. */
485 if (symbol->section->name != input_section->name
486 && output_bfd != (bfd *)NULL)
487 return bfd_reloc_continue;
489 relocation = (target & 0x00ffffff) << 2;
490 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
491 relocation += symbol->value;
492 relocation += symbol->section->output_section->vma;
493 relocation += symbol->section->output_offset;
494 relocation += reloc_entry->addend;
495 relocation -= input_section->output_section->vma;
496 relocation -= input_section->output_offset;
500 return bfd_reloc_overflow;
502 /* Check for overflow */
503 if (relocation & 0x02000000)
505 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
506 flag = bfd_reloc_overflow;
508 else if (relocation & ~0x03ffffff)
509 flag = bfd_reloc_overflow;
511 target &= ~0x00ffffff;
512 target |= (relocation >> 2) & 0x00ffffff;
513 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
515 /* Now the ARM magic... Change the reloc type so that it is marked as done.
516 Strictly this is only necessary if we are doing a partial relocation. */
517 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
522 static bfd_reloc_status_type
523 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
524 output_bfd, error_message, btype)
526 arelent *reloc_entry;
529 asection *input_section;
531 char **error_message;
532 thumb_pcrel_branchtype btype;
534 bfd_vma relocation = 0;
535 bfd_size_type addr = reloc_entry->address;
536 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
537 bfd_reloc_status_type flag = bfd_reloc_ok;
542 /* NOTE: This routine is currently used by GAS, but not by the link
550 signbit = 0x00000100;
556 signbit = 0x00000800;
562 signbit = 0x00400000;
569 /* If this is an undefined symbol, return error */
570 if (symbol->section == &bfd_und_section
571 && (symbol->flags & BSF_WEAK) == 0)
572 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
574 /* If the sections are different, and we are doing a partial relocation,
575 just ignore it for now. */
576 if (symbol->section->name != input_section->name
577 && output_bfd != (bfd *)NULL)
578 return bfd_reloc_continue;
584 relocation = ((target & dstmsk) << 1);
588 if (bfd_big_endian (abfd))
589 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
591 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
598 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
599 relocation += symbol->value;
600 relocation += symbol->section->output_section->vma;
601 relocation += symbol->section->output_offset;
602 relocation += reloc_entry->addend;
603 relocation -= input_section->output_section->vma;
604 relocation -= input_section->output_offset;
608 return bfd_reloc_overflow;
610 /* Check for overflow */
611 if (relocation & signbit)
613 if ((relocation & ~offmsk) != ~offmsk)
614 flag = bfd_reloc_overflow;
616 else if (relocation & ~offmsk)
617 flag = bfd_reloc_overflow;
624 target |= (relocation >> 1);
628 if (bfd_big_endian (abfd))
629 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
631 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
638 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
640 /* Now the ARM magic... Change the reloc type so that it is marked as done.
641 Strictly this is only necessary if we are doing a partial relocation. */
642 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
644 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
648 static bfd_reloc_status_type
649 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
650 output_bfd, error_message)
652 arelent *reloc_entry;
655 asection *input_section;
657 char **error_message;
659 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
660 input_section, output_bfd, error_message, b23);
663 static bfd_reloc_status_type
664 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
665 output_bfd, error_message)
667 arelent *reloc_entry;
670 asection *input_section;
672 char **error_message;
674 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
675 input_section, output_bfd, error_message, b12);
678 static bfd_reloc_status_type
679 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
680 output_bfd, error_message)
682 arelent *reloc_entry;
685 asection *input_section;
687 char **error_message;
689 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
690 input_section, output_bfd, error_message, b9);
694 static CONST struct reloc_howto_struct *
695 coff_arm_reloc_type_lookup (abfd, code)
697 bfd_reloc_code_real_type code;
699 #define ASTD(i,j) case i: return &aoutarm_std_reloc_howto[j]
700 if (code == BFD_RELOC_CTOR)
701 switch (bfd_get_arch_info (abfd)->bits_per_address)
706 default: return (CONST struct reloc_howto_struct *) 0;
711 ASTD (BFD_RELOC_8, ARM_8);
712 ASTD (BFD_RELOC_16, ARM_16);
713 ASTD (BFD_RELOC_32, ARM_32);
714 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
715 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
716 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
717 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
718 ASTD (BFD_RELOC_RVA, ARM_RVA32);
719 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
720 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
721 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
722 default: return (CONST struct reloc_howto_struct *) 0;
726 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
727 #define COFF_PAGE_SIZE 0x1000
728 /* Turn a howto into a reloc nunmber */
730 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
731 #define BADMAG(x) ARMBADMAG(x)
732 #define ARM 1 /* Customize coffcode.h */
734 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
735 This allows us to store global data here without actually creating any
736 global variables, which is a no-no in the BFD world. */
737 struct coff_arm_link_hash_table
739 /* The original coff_link_hash_table structure. MUST be first field. */
740 struct coff_link_hash_table root;
742 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
743 long int thumb_glue_size;
745 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
746 long int arm_glue_size;
748 /* An arbitary input BFD chosen to hold the glue sections. */
749 bfd * bfd_of_glue_owner;
751 /* Support interworking with old, non-interworking aware ARM code. */
752 int support_old_code;
755 /* Get the ARM coff linker hash table from a link_info structure. */
756 #define coff_arm_hash_table(info) \
757 ((struct coff_arm_link_hash_table *) ((info)->hash))
759 /* Create an ARM coff linker hash table. */
761 static struct bfd_link_hash_table *
762 coff_arm_link_hash_table_create (abfd)
765 struct coff_arm_link_hash_table * ret;
767 ret = ((struct coff_arm_link_hash_table *)
768 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
769 if (ret == (struct coff_arm_link_hash_table *) NULL)
772 if (! _bfd_coff_link_hash_table_init
773 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
775 bfd_release (abfd, ret);
776 return (struct bfd_link_hash_table *) NULL;
779 ret->thumb_glue_size = 0;
780 ret->arm_glue_size = 0;
781 ret->bfd_of_glue_owner = NULL;
783 return & ret->root.root;
787 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
788 struct bfd_link_info *info;
790 asection *input_section;
791 bfd_vma reloc_offset;
793 bfd_vma addr = reloc_offset
795 + input_section->output_offset
796 + input_section->output_section->vma;
798 if (coff_data(output_bfd)->pe)
799 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
800 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
804 /* The thumb form of a long branch is a bit finicky, because the offset
805 encoding is split over two fields, each in it's own instruction. They
806 can occur in any order. So given a thumb form of long branch, and an
807 offset, insert the offset into the thumb branch and return finished
810 It takes two thumb instructions to encode the target address. Each has
811 11 bits to invest. The upper 11 bits are stored in one (identifed by
812 H-0.. see below), the lower 11 bits are stored in the other (identified
815 Combine together and shifted left by 1 (it's a half word address) and
819 H-0, upper address-0 = 000
821 H-1, lower address-0 = 800
823 They can be ordered either way, but the arm tools I've seen always put
824 the lower one first. It probably doesn't matter. krk@cygnus.com
826 XXX: Actually the order does matter. The second instruction (H-1)
827 moves the computed address into the PC, so it must be the second one
828 in the sequence. The problem, however is that whilst little endian code
829 stores the instructions in HI then LOW order, big endian code does the
830 reverse. nickc@cygnus.com */
832 #define LOW_HI_ORDER 0xF800F000
833 #define HI_LOW_ORDER 0xF000F800
836 insert_thumb_branch (br_insn, rel_off)
840 unsigned int low_bits;
841 unsigned int high_bits;
844 BFD_ASSERT((rel_off & 1) != 1);
846 rel_off >>= 1; /* half word aligned address */
847 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
848 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
850 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
851 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
852 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
853 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
855 abort(); /* error - not a valid branch instruction form */
857 /* FIXME: abort is probably not the right call. krk@cygnus.com */
863 static struct coff_link_hash_entry *
864 find_thumb_glue (info, name, input_bfd)
865 struct bfd_link_info * info;
870 struct coff_link_hash_entry * myh;
873 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
875 BFD_ASSERT (tmp_name);
877 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
879 myh = coff_link_hash_lookup
880 (coff_hash_table (info), tmp_name, false, false, true);
883 /* xgettext:c-format */
884 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
885 bfd_get_filename (input_bfd), tmp_name, name);
892 static struct coff_link_hash_entry *
893 find_arm_glue (info, name, input_bfd)
894 struct bfd_link_info * info;
899 struct coff_link_hash_entry * myh;
902 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
904 BFD_ASSERT (tmp_name);
906 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
908 myh = coff_link_hash_lookup
909 (coff_hash_table (info), tmp_name, false, false, true);
912 /* xgettext:c-format */
913 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
914 bfd_get_filename (input_bfd), tmp_name, name);
929 .word func @ behave as if you saw a ARM_32 reloc
932 #define ARM2THUMB_GLUE_SIZE 12
933 static const insn32 a2t1_ldr_insn = 0xe59fc000;
934 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
935 static const insn32 a2t3_func_addr_insn = 0x00000001;
937 #define A2T3_OFFSET 8
940 Thumb->ARM: Thumb->(non-interworking aware) ARM
944 __func_from_thumb: __func_from_thumb:
946 nop ldr r6, __func_addr
948 __func_change_to_arm: bx r6
950 __func_back_to_thumb:
957 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
958 static const insn16 t2a1_bx_pc_insn = 0x4778;
959 static const insn16 t2a2_noop_insn = 0x46c0;
960 static const insn32 t2a3_b_insn = 0xea000000;
962 #define T2A3_OFFSET 8
964 static const insn16 t2a1_push_insn = 0xb540;
965 static const insn16 t2a2_ldr_insn = 0x4e03;
966 static const insn16 t2a3_mov_insn = 0x46fe;
967 static const insn16 t2a4_bx_insn = 0x4730;
968 static const insn32 t2a5_pop_insn = 0xe8bd4040;
969 static const insn32 t2a6_bx_insn = 0xe12fff1e;
972 We should really create new local (static) symbols in destination
973 object for each stub we create. We should also create local
974 (static) symbols within the stubs when switching between ARM and
975 Thumb code. This will ensure that the debugger and disassembler
976 can present a better view of stubs.
978 We can treat stubs like literal sections, and for the THUMB9 ones
979 (short addressing range) we should be able to insert the stubs
980 between sections. i.e. the simplest approach (since relocations
981 are done on a section basis) is to dump the stubs at the end of
982 processing a section. That way we can always try and minimise the
983 offset to and from a stub. However, this does not map well onto
984 the way that the linker/BFD does its work: mapping all input
985 sections to output sections via the linker script before doing
988 Unfortunately it may be easier to just to disallow short range
989 Thumb->ARM stubs (i.e. no conditional inter-working branches,
990 only branch-and-link (BL) calls. This will simplify the processing
991 since we can then put all of the stubs into their own section.
994 On a different subject, rather than complaining when a
995 branch cannot fit in the number of bits available for the
996 instruction we should generate a trampoline stub (needed to
997 address the complete 32bit address space). */
999 /* The standard COFF backend linker does not cope with the special
1000 Thumb BRANCH23 relocation. The alternative would be to split the
1001 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1002 bit simpler simply providing our own relocation driver. */
1004 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1005 This code is a very slightly modified copy of
1006 _bfd_coff_generic_relocate_section. It would be a much more
1007 maintainable solution to have a MACRO that could be expanded within
1008 _bfd_coff_generic_relocate_section that would only be provided for
1009 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1010 is different from the original. */
1013 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1014 contents, relocs, syms, sections)
1016 struct bfd_link_info *info;
1018 asection *input_section;
1020 struct internal_reloc *relocs;
1021 struct internal_syment *syms;
1022 asection **sections;
1024 struct internal_reloc * rel;
1025 struct internal_reloc * relend;
1028 relend = rel + input_section->reloc_count;
1030 for (; rel < relend; rel++)
1034 struct coff_link_hash_entry * h;
1035 struct internal_syment * sym;
1038 reloc_howto_type * howto;
1039 bfd_reloc_status_type rstat;
1042 symndx = rel->r_symndx;
1051 h = obj_coff_sym_hashes (input_bfd)[symndx];
1052 sym = syms + symndx;
1055 /* COFF treats common symbols in one of two ways. Either the
1056 size of the symbol is included in the section contents, or it
1057 is not. We assume that the size is not included, and force
1058 the rtype_to_howto function to adjust the addend as needed. */
1060 if (sym != NULL && sym->n_scnum != 0)
1061 addend = - sym->n_value;
1066 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1071 /* The relocation_section function will skip pcrel_offset relocs
1072 when doing a relocateable link. However, we want to convert
1073 ARM26 to ARM26D relocs if possible. We return a fake howto in
1074 this case without pcrel_offset set, and adjust the addend to
1076 if (rel->r_type == ARM_26
1078 && info->relocateable
1079 && (h->root.type == bfd_link_hash_defined
1080 || h->root.type == bfd_link_hash_defweak)
1081 && h->root.u.def.section->output_section == input_section->output_section)
1083 static reloc_howto_type fake_arm26_reloc =
1090 complain_overflow_signed,
1091 aoutarm_fix_pcrel_26 ,
1098 addend -= rel->r_vaddr - input_section->vma;
1099 howto = &fake_arm26_reloc;
1102 /* If we are doing a relocateable link, then we can just ignore
1103 a PC relative reloc that is pcrel_offset. It will already
1104 have the correct value. If this is not a relocateable link,
1105 then we should ignore the symbol value. */
1106 if (howto->pc_relative && howto->pcrel_offset)
1108 if (info->relocateable)
1110 if (sym != NULL && sym->n_scnum != 0)
1111 addend += sym->n_value;
1122 sec = bfd_abs_section_ptr;
1127 sec = sections[symndx];
1128 val = (sec->output_section->vma
1129 + sec->output_offset
1136 #if 1 /* THUMBEXTENSION */
1137 /* We don't output the stubs if we are generating a
1138 relocatable output file, since we may as well leave the
1139 stub generation to the final linker pass. If we fail to
1140 verify that the name is defined, we'll try to build stubs
1141 for an undefined name... */
1142 if (! info->relocateable
1143 && ( h->root.type == bfd_link_hash_defined
1144 || h->root.type == bfd_link_hash_defweak))
1146 asection * h_sec = h->root.u.def.section;
1147 const char * name = h->root.root.string;
1149 /* h locates the symbol referenced in the reloc. */
1150 h_val = (h->root.u.def.value
1151 + h_sec->output_section->vma
1152 + h_sec->output_offset);
1154 if (howto->type == ARM_26)
1156 if ( h->class == C_THUMBSTATFUNC
1157 || h->class == C_THUMBEXTFUNC)
1159 /* Arm code calling a Thumb function */
1160 unsigned long int tmp;
1163 long int ret_offset;
1164 struct coff_link_hash_entry * myh;
1165 struct coff_arm_link_hash_table * globals;
1167 myh = find_arm_glue (info, name, input_bfd);
1171 globals = coff_arm_hash_table (info);
1173 BFD_ASSERT (globals != NULL);
1174 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1176 my_offset = myh->root.u.def.value;
1178 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1179 ARM2THUMB_GLUE_SECTION_NAME);
1180 BFD_ASSERT (s != NULL);
1181 BFD_ASSERT (s->contents != NULL);
1182 BFD_ASSERT (s->output_section != NULL);
1184 if ((my_offset & 0x01) == 0x01)
1186 if (h_sec->owner != NULL
1187 && INTERWORK_SET (h_sec->owner)
1188 && ! INTERWORK_FLAG (h_sec->owner))
1191 /* xgettext:c-format */
1192 (_("%s(%s): warning: interworking not enabled."),
1193 bfd_get_filename (h_sec->owner), name);
1195 /* xgettext:c-format */
1196 (_(" first occurrence: %s: arm call to thumb"),
1197 bfd_get_filename (input_bfd));
1201 myh->root.u.def.value = my_offset;
1203 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1204 s->contents + my_offset);
1206 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1207 s->contents + my_offset + 4);
1209 /* It's a thumb address. Add the low order bit. */
1210 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1211 s->contents + my_offset + 8);
1213 if (info->base_file)
1214 arm_emit_base_file_entry (info, output_bfd, s, A2T3_OFFSET);
1218 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1220 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1221 - input_section->vma);
1223 tmp = tmp & 0xFF000000;
1225 /* Somehow these are both 4 too far, so subtract 8. */
1229 + s->output_section->vma
1230 - (input_section->output_offset
1231 + input_section->output_section->vma
1235 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1237 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1238 - input_section->vma);
1244 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1245 else if (howto->type == ARM_THUMB23)
1247 if ( h->class == C_EXT
1248 || h->class == C_STAT
1249 || h->class == C_LABEL)
1251 /* Thumb code calling an ARM function */
1254 unsigned long int tmp;
1255 long int ret_offset;
1256 struct coff_link_hash_entry * myh;
1257 struct coff_arm_link_hash_table * globals;
1259 myh = find_thumb_glue (info, name, input_bfd);
1263 globals = coff_arm_hash_table (info);
1265 BFD_ASSERT (globals != NULL);
1266 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1268 my_offset = myh->root.u.def.value;
1270 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1271 THUMB2ARM_GLUE_SECTION_NAME);
1273 BFD_ASSERT (s != NULL);
1274 BFD_ASSERT (s->contents != NULL);
1275 BFD_ASSERT (s->output_section != NULL);
1277 if ((my_offset & 0x01) == 0x01)
1279 if (h_sec->owner != NULL
1280 && INTERWORK_SET (h_sec->owner)
1281 && ! INTERWORK_FLAG (h_sec->owner)
1282 && ! globals->support_old_code)
1285 /* xgettext:c-format */
1286 (_("%s(%s): warning: interworking not enabled."),
1287 bfd_get_filename (h_sec->owner), name);
1289 /* xgettext:c-format */
1290 (_(" first occurrence: %s: thumb call to arm"),
1291 bfd_get_filename (input_bfd));
1293 (_(" consider relinking with --support-old-code enabled"));
1297 myh->root.u.def.value = my_offset;
1299 if (globals->support_old_code)
1301 bfd_put_16 (output_bfd, t2a1_push_insn,
1302 s->contents + my_offset);
1304 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1305 s->contents + my_offset + 2);
1307 bfd_put_16 (output_bfd, t2a3_mov_insn,
1308 s->contents + my_offset + 4);
1310 bfd_put_16 (output_bfd, t2a4_bx_insn,
1311 s->contents + my_offset + 6);
1313 bfd_put_32 (output_bfd, t2a5_pop_insn,
1314 s->contents + my_offset + 8);
1316 bfd_put_32 (output_bfd, t2a6_bx_insn,
1317 s->contents + my_offset + 12);
1319 /* Store the address of the function in the last word of the stub. */
1320 bfd_put_32 (output_bfd, h_val,
1321 s->contents + my_offset + 16);
1325 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1326 s->contents + my_offset);
1328 bfd_put_16 (output_bfd, t2a2_noop_insn,
1329 s->contents + my_offset + 2);
1332 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1334 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1335 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1336 + s->output_section->vma) /* Address of the start of the current section. */
1337 + 4 /* The branch instruction is 4 bytes into the stub. */
1338 + 8); /* ARM branches work from the pc of the instruction + 8. */
1340 bfd_put_32 (output_bfd,
1341 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1342 s->contents + my_offset + 4);
1344 if (info->base_file)
1345 arm_emit_base_file_entry (info, output_bfd, s, T2A3_OFFSET);
1349 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1351 /* Now go back and fix up the original BL insn to point
1356 - (input_section->output_offset
1360 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1361 - input_section->vma);
1363 bfd_put_32 (output_bfd,
1364 insert_thumb_branch (tmp, ret_offset),
1365 contents + rel->r_vaddr
1366 - input_section->vma);
1368 if (info->base_file)
1369 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1376 /* If the relocation type and destination symbol does not
1377 fall into one of the above categories, then we can just
1378 perform a direct link. */
1381 rstat = bfd_reloc_ok;
1383 #endif /* THUMBEXTENSION */
1384 if ( h->root.type == bfd_link_hash_defined
1385 || h->root.type == bfd_link_hash_defweak)
1389 sec = h->root.u.def.section;
1390 val = (h->root.u.def.value
1391 + sec->output_section->vma
1392 + sec->output_offset);
1395 else if (! info->relocateable)
1397 if (! ((*info->callbacks->undefined_symbol)
1398 (info, h->root.root.string, input_bfd, input_section,
1399 rel->r_vaddr - input_section->vma)))
1404 if (info->base_file)
1406 /* Emit a reloc if the backend thinks it needs it. */
1407 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1408 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1411 #if 1 /* THUMBEXTENSION */
1413 rstat = bfd_reloc_ok;
1414 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1415 else if (! info->relocateable
1416 && howto->type == ARM_THUMB23)
1418 /* This is pretty much a copy of what the default
1419 _bfd_final_link_relocate and _bfd_relocate_contents
1420 routines do to perform a relocation, with special
1421 processing for the split addressing of the Thumb BL
1422 instruction. Again, it would probably be simpler adding a
1423 ThumbBRANCH23 specific macro expansion into the default
1426 bfd_vma address = rel->r_vaddr - input_section->vma;
1428 if (address > input_section->_raw_size)
1429 rstat = bfd_reloc_outofrange;
1432 bfd_vma relocation = val + addend;
1433 int size = bfd_get_reloc_size (howto);
1434 boolean overflow = false;
1435 bfd_byte * location = contents + address;
1436 bfd_vma x = bfd_get_32 (input_bfd, location);
1437 bfd_vma src_mask = 0x007FFFFE;
1438 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1439 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1441 bfd_signed_vma signed_check;
1443 bfd_signed_vma signed_add;
1445 BFD_ASSERT (size == 4);
1447 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1448 relocation -= (input_section->output_section->vma
1449 + input_section->output_offset);
1451 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1452 relocation -= address;
1454 /* No need to negate the relocation with BRANCH23. */
1455 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1456 /* howto->rightshift == 1 */
1457 /* Drop unwanted bits from the value we are relocating to. */
1459 check = relocation >> howto->rightshift;
1461 /* If this is a signed value, the rightshift just dropped
1462 leading 1 bits (assuming twos complement). */
1463 if ((bfd_signed_vma) relocation >= 0)
1464 signed_check = check;
1466 signed_check = (check
1468 & ~((bfd_vma) - 1 >> howto->rightshift)));
1470 /* Get the value from the object file. */
1471 if (bfd_big_endian (input_bfd))
1473 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1477 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1480 /* Get the value from the object file with an appropriate sign.
1481 The expression involving howto->src_mask isolates the upper
1482 bit of src_mask. If that bit is set in the value we are
1483 adding, it is negative, and we subtract out that number times
1484 two. If src_mask includes the highest possible bit, then we
1485 can not get the upper bit, but that does not matter since
1486 signed_add needs no adjustment to become negative in that
1491 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1492 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1494 /* Add the value from the object file, shifted so that it is a
1496 /* howto->bitpos == 0 */
1498 signed_check += signed_add;
1499 relocation += signed_add;
1501 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1503 /* Assumes two's complement. */
1504 if ( signed_check > reloc_signed_max
1505 || signed_check < reloc_signed_min)
1508 /* Put RELOCATION into the correct bits: */
1510 if (bfd_big_endian (input_bfd))
1512 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1516 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1519 /* Add RELOCATION to the correct bits of X: */
1520 x = ((x & ~howto->dst_mask) | relocation);
1522 /* Put the relocated value back in the object file: */
1523 bfd_put_32 (input_bfd, x, location);
1525 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1529 #endif /* THUMBEXTENSION */
1530 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1532 rel->r_vaddr - input_section->vma,
1534 #if 1 /* THUMBEXTENSION */
1536 Is this the best way to fix up thumb addresses? krk@cygnus.com
1537 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1538 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1539 if (! info->relocateable
1540 && rel->r_type == ARM_32)
1542 /* Determine if we need to set the bottom bit of a relocated address
1543 because the address is the address of a Thumb code symbol. */
1545 int patchit = false;
1548 && ( h->class == C_THUMBSTATFUNC
1549 || h->class == C_THUMBEXTFUNC))
1553 else if (sym != NULL
1554 && sym->n_scnum > N_UNDEF)
1556 /* No hash entry - use the symbol instead. */
1558 if ( sym->n_sclass == C_THUMBSTATFUNC
1559 || sym->n_sclass == C_THUMBEXTFUNC)
1565 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1566 bfd_vma x = bfd_get_32 (input_bfd, location);
1568 bfd_put_32 (input_bfd, x | 1, location);
1571 #endif /* THUMBEXTENSION */
1579 case bfd_reloc_outofrange:
1580 (*_bfd_error_handler)
1581 (_("%s: bad reloc address 0x%lx in section `%s'"),
1582 bfd_get_filename (input_bfd),
1583 (unsigned long) rel->r_vaddr,
1584 bfd_get_section_name (input_bfd, input_section));
1586 case bfd_reloc_overflow:
1589 char buf[SYMNMLEN + 1];
1594 name = h->root.root.string;
1597 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1602 if (! ((*info->callbacks->reloc_overflow)
1603 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1604 input_section, rel->r_vaddr - input_section->vma)))
1613 #ifndef COFF_WITH_PE
1615 bfd_arm_allocate_interworking_sections (info)
1616 struct bfd_link_info * info;
1620 struct coff_arm_link_hash_table * globals;
1622 static char test_char = '1';
1625 globals = coff_arm_hash_table (info);
1627 BFD_ASSERT (globals != NULL);
1629 if (globals->arm_glue_size != 0)
1631 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1633 s = bfd_get_section_by_name
1634 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1636 BFD_ASSERT (s != NULL);
1638 foo = (bfd_byte *) bfd_alloc
1639 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1641 memset (foo, test_char, globals->arm_glue_size);
1644 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1648 if (globals->thumb_glue_size != 0)
1650 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1652 s = bfd_get_section_by_name
1653 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1655 BFD_ASSERT (s != NULL);
1657 foo = (bfd_byte *) bfd_alloc
1658 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1660 memset (foo, test_char, globals->thumb_glue_size);
1663 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1671 record_arm_to_thumb_glue (info, h)
1672 struct bfd_link_info * info;
1673 struct coff_link_hash_entry * h;
1675 const char * name = h->root.root.string;
1676 register asection * s;
1678 struct coff_link_hash_entry * myh;
1679 struct coff_arm_link_hash_table * globals;
1681 globals = coff_arm_hash_table (info);
1683 BFD_ASSERT (globals != NULL);
1684 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1686 s = bfd_get_section_by_name
1687 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1689 BFD_ASSERT (s != NULL);
1691 tmp_name = ((char *)
1692 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1694 BFD_ASSERT (tmp_name);
1696 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1698 myh = coff_link_hash_lookup
1699 (coff_hash_table (info), tmp_name, false, false, true);
1704 return; /* we've already seen this guy */
1707 /* The only trick here is using globals->arm_glue_size as the value. Even
1708 though the section isn't allocated yet, this is where we will be putting
1711 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1713 s, globals->arm_glue_size + 1,
1715 (struct bfd_link_hash_entry **) & myh);
1719 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1725 record_thumb_to_arm_glue (info, h)
1726 struct bfd_link_info * info;
1727 struct coff_link_hash_entry * h;
1729 const char * name = h->root.root.string;
1730 register asection * s;
1732 struct coff_link_hash_entry * myh;
1733 struct coff_arm_link_hash_table * globals;
1736 globals = coff_arm_hash_table (info);
1738 BFD_ASSERT (globals != NULL);
1739 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1741 s = bfd_get_section_by_name
1742 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1744 BFD_ASSERT (s != NULL);
1746 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1748 BFD_ASSERT (tmp_name);
1750 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1752 myh = coff_link_hash_lookup
1753 (coff_hash_table (info), tmp_name, false, false, true);
1758 return; /* we've already seen this guy */
1761 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1762 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1764 (struct bfd_link_hash_entry **) & myh);
1766 /* If we mark it 'thumb', the disassembler will do a better job. */
1767 myh->class = C_THUMBEXTFUNC;
1771 /* Allocate another symbol to mark where we switch to arm mode. */
1773 #define CHANGE_TO_ARM "__%s_change_to_arm"
1774 #define BACK_FROM_ARM "__%s_back_from_arm"
1776 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1778 BFD_ASSERT (tmp_name);
1780 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1784 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1785 BSF_LOCAL, s, globals->thumb_glue_size
1786 + (globals->support_old_code ? 8 : 4),
1788 (struct bfd_link_hash_entry **) & myh);
1792 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1797 /* Select a BFD to be used to hold the sections used by the glue code.
1798 This function is called from the linker scripts in ld/emultempl/
1801 bfd_arm_get_bfd_for_interworking (abfd, info)
1803 struct bfd_link_info * info;
1805 struct coff_arm_link_hash_table * globals;
1809 /* If we are only performing a partial link do not bother
1810 getting a bfd to hold the glue. */
1811 if (info->relocateable)
1814 globals = coff_arm_hash_table (info);
1816 BFD_ASSERT (globals != NULL);
1818 if (globals->bfd_of_glue_owner != NULL)
1821 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1825 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1827 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1830 || ! bfd_set_section_flags (abfd, sec, flags)
1831 || ! bfd_set_section_alignment (abfd, sec, 2))
1835 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1839 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1841 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1844 || ! bfd_set_section_flags (abfd, sec, flags)
1845 || ! bfd_set_section_alignment (abfd, sec, 2))
1849 /* Save the bfd for later use. */
1850 globals->bfd_of_glue_owner = abfd;
1856 bfd_arm_process_before_allocation (abfd, info, support_old_code)
1858 struct bfd_link_info * info;
1859 int support_old_code;
1862 struct coff_arm_link_hash_table * globals;
1864 /* If we are only performing a partial link do not bother
1865 to construct any glue. */
1866 if (info->relocateable)
1869 /* Here we have a bfd that is to be included on the link. We have a hook
1870 to do reloc rummaging, before section sizes are nailed down. */
1872 _bfd_coff_get_external_symbols (abfd);
1874 globals = coff_arm_hash_table (info);
1876 BFD_ASSERT (globals != NULL);
1877 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1879 globals->support_old_code = support_old_code;
1881 /* Rummage around all the relocs and map the glue vectors. */
1882 sec = abfd->sections;
1887 for (; sec != NULL; sec = sec->next)
1889 struct internal_reloc * i;
1890 struct internal_reloc * rel;
1892 if (sec->reloc_count == 0)
1895 /* Load the relocs. */
1896 /* FIXME: there may be a storage leak here. */
1898 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
1900 BFD_ASSERT (i != 0);
1902 for (rel = i; rel < i + sec->reloc_count; ++rel)
1904 unsigned short r_type = rel->r_type;
1906 struct coff_link_hash_entry * h;
1908 symndx = rel->r_symndx;
1910 /* If the relocation is not against a symbol it cannot concern us. */
1914 h = obj_coff_sym_hashes (abfd)[symndx];
1916 /* If the relocation is against a static symbol it must be within
1917 the current section and so cannot be a cross ARM/Thumb relocation. */
1924 /* This one is a call from arm code. We need to look up
1925 the target of the call. If it is a thumb target, we
1928 if (h->class == C_THUMBEXTFUNC)
1929 record_arm_to_thumb_glue (info, h);
1933 /* This one is a call from thumb code. We used to look
1934 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
1935 up the target of the call. If it is an arm target, we
1936 insert glue. If the symbol does not exist it will be
1937 given a class of C_EXT and so we will generate a stub
1938 for it. This is not really a problem, since the link
1939 is doomed anyway. */
1946 record_thumb_to_arm_glue (info, h);
1962 #endif /* ! COFF_WITH_PE */
1964 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
1965 #define coff_relocate_section coff_arm_relocate_section
1966 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
1967 #define coff_adjust_symndx coff_arm_adjust_symndx
1968 #define coff_link_output_has_begun coff_arm_link_output_has_begun
1969 #define coff_final_link_postscript coff_arm_final_link_postscript
1970 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
1971 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
1972 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
1973 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
1974 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
1977 /* When doing a relocateable link, we want to convert ARM26 relocs
1978 into ARM26D relocs. */
1981 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
1983 struct bfd_link_info *info;
1986 struct internal_reloc *irel;
1989 if (irel->r_type == 3)
1991 struct coff_link_hash_entry *h;
1993 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
1995 && (h->root.type == bfd_link_hash_defined
1996 || h->root.type == bfd_link_hash_defweak)
1997 && h->root.u.def.section->output_section == sec->output_section)
2004 /* Called when merging the private data areas of two BFDs.
2005 This is important as it allows us to detect if we are
2006 attempting to merge binaries compiled for different ARM
2007 targets, eg different CPUs or differents APCS's. */
2010 coff_arm_merge_private_bfd_data (ibfd, obfd)
2014 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2019 /* If the two formats are different we cannot merge anything.
2020 This is not an error, since it is permissable to change the
2021 input and output formats. */
2022 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2023 || obfd->xvec->flavour != bfd_target_coff_flavour)
2026 /* Verify that the APCS is the same for the two BFDs */
2027 if (APCS_SET (ibfd))
2029 if (APCS_SET (obfd))
2031 /* If the src and dest have different APCS flag bits set, fail. */
2032 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2035 /* xgettext: c-format */
2036 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2037 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2038 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2041 bfd_set_error (bfd_error_wrong_format);
2045 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2049 if (APCS_FLOAT_FLAG (ibfd))
2050 /* xgettext: c-format */
2051 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2053 /* xgettext: c-format */
2054 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2056 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2057 bfd_get_filename (obfd));
2059 bfd_set_error (bfd_error_wrong_format);
2063 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2067 if (PIC_FLAG (ibfd))
2068 /* xgettext: c-format */
2069 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2071 /* xgettext: c-format */
2072 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2073 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2074 bfd_get_filename (obfd));
2076 bfd_set_error (bfd_error_wrong_format);
2082 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2084 /* Set up the arch and fields as well as these are probably wrong. */
2085 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2089 /* Check the interworking support. */
2090 if (INTERWORK_SET (ibfd))
2092 if (INTERWORK_SET (obfd))
2094 /* If the src and dest differ in their interworking issue a warning. */
2095 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2099 if (INTERWORK_FLAG (ibfd))
2100 /* xgettext: c-format */
2101 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2103 /* xgettext: c-format */
2104 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2106 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2107 bfd_get_filename (obfd));
2112 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2120 /* Display the flags field. */
2123 coff_arm_print_private_bfd_data (abfd, ptr)
2127 FILE * file = (FILE *) ptr;
2129 BFD_ASSERT (abfd != NULL && ptr != NULL);
2131 /* xgettext:c-format */
2132 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2134 if (APCS_SET (abfd))
2136 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2137 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2139 if (APCS_FLOAT_FLAG (abfd))
2140 fprintf (file, _(" [floats passed in float registers]"));
2142 fprintf (file, _(" [floats passed in integer registers]"));
2144 if (PIC_FLAG (abfd))
2145 fprintf (file, _(" [position independent]"));
2147 fprintf (file, _(" [absolute position]"));
2150 if (! INTERWORK_SET (abfd))
2151 fprintf (file, _(" [interworking flag not initialised]"));
2152 else if (INTERWORK_FLAG (abfd))
2153 fprintf (file, _(" [interworking supported]"));
2155 fprintf (file, _(" [interworking not supported]"));
2163 /* Copies the given flags into the coff_tdata.flags field.
2164 Typically these flags come from the f_flags[] field of
2165 the COFF filehdr structure, which contains important,
2166 target specific information.
2167 Note: Although this function is static, it is explicitly
2168 called from both coffcode.h and peicode.h. */
2171 _bfd_coff_arm_set_private_flags (abfd, flags)
2177 BFD_ASSERT (abfd != NULL);
2179 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2181 /* Make sure that the APCS field has not been initialised to the opposite
2184 && ( (APCS_26_FLAG (abfd) != flag)
2185 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2186 || (PIC_FLAG (abfd) != (flags & F_PIC_INT ? F_PIC : 0))
2190 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2192 SET_APCS_FLAGS (abfd, flag);
2194 flag = (flags & F_INTERWORK);
2196 /* If the BFD has already had its interworking flag set, but it
2197 is different from the value that we have been asked to set,
2198 then assume that that merged code will not support interworking
2199 and set the flag accordingly. */
2200 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2203 /* xgettext: c-format */
2204 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2205 bfd_get_filename (abfd));
2207 /* xgettext: c-format */
2208 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2209 bfd_get_filename (abfd));
2213 SET_INTERWORK_FLAG (abfd, flag);
2219 /* Copy the important parts of the target specific data
2220 from one instance of a BFD to another. */
2223 coff_arm_copy_private_bfd_data (src, dest)
2227 BFD_ASSERT (src != NULL && dest != NULL);
2232 /* If the destination is not in the same format as the source, do not do
2234 if (src->xvec != dest->xvec)
2237 /* copy the flags field */
2240 if (APCS_SET (dest))
2242 /* If the src and dest have different APCS flag bits set, fail. */
2243 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2246 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2249 if (PIC_FLAG (dest) != PIC_FLAG (src))
2253 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2257 if (INTERWORK_SET (src))
2259 if (INTERWORK_SET (dest))
2261 /* If the src and dest have different interworking flags then turn
2262 off the interworking bit. */
2263 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2265 if (INTERWORK_FLAG (dest))
2267 /* xgettext:c-format */
2268 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2269 bfd_get_filename (dest),
2270 bfd_get_filename (src));
2273 SET_INTERWORK_FLAG (dest, 0);
2278 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2285 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2286 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2287 #define LOCAL_LABEL_PREFIX "."
2288 #ifndef USER_LABEL_PREFIX
2289 #define USER_LABEL_PREFIX "_"
2293 coff_arm_is_local_label_name (abfd, name)
2297 #ifdef LOCAL_LABEL_PREFIX
2298 /* If there is a prefix for local labels then look for this.
2299 If the prefix exists, but it is empty, then ignore the test. */
2301 if (LOCAL_LABEL_PREFIX[0] != 0)
2303 if (strncmp (name, LOCAL_LABEL_PREFIX, strlen (LOCAL_LABEL_PREFIX)) == 0)
2307 #ifdef USER_LABEL_PREFIX
2308 if (USER_LABEL_PREFIX[0] != 0)
2310 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2315 /* devo/gcc/config/dbxcoff.h defines ASM_OUTPUT_SOURCE_LINE to generate
2316 local line numbers as .LM<number>, so treat these as local. */
2320 case 'L': return true;
2321 case '.': return (name[1] == 'L' && name[2] == 'M') ? true : false;
2322 default: return false; /* Cannot make our minds up - default to
2323 false so that it will not be stripped
2328 /* This piece of machinery exists only to guarantee that the bfd that holds
2329 the glue section is written last.
2331 This does depend on bfd_make_section attaching a new section to the
2332 end of the section list for the bfd.
2337 coff_arm_link_output_has_begun (sub, info)
2339 struct coff_final_link_info * info;
2341 return (sub->output_has_begun
2342 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2346 coff_arm_final_link_postscript (abfd, pfinfo)
2348 struct coff_final_link_info * pfinfo;
2350 struct coff_arm_link_hash_table * globals;
2352 globals = coff_arm_hash_table (pfinfo->info);
2354 BFD_ASSERT (globals != NULL);
2356 if (globals->bfd_of_glue_owner != NULL)
2358 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2361 globals->bfd_of_glue_owner->output_has_begun = true;
2368 #define coff_SWAP_sym_in arm_bfd_coff_swap_sym_in
2370 static void coff_swap_sym_in PARAMS ((bfd *, PTR, PTR));
2372 /* Sepcial version of symbol swapper, used to grab a bfd
2373 onto which the glue sections can be attached. */
2375 arm_bfd_coff_swap_sym_in (abfd, ext1, in1)
2381 register asection * s;
2383 /* Do the normal swap in. */
2384 coff_swap_sym_in (abfd, ext1, in1);
2386 if (bfd_of_glue_owner != NULL) /* we already have a toc, so go home */
2389 /* Save the bfd for later allocation. */
2390 bfd_of_glue_owner = abfd;
2392 s = bfd_get_section_by_name (bfd_of_glue_owner ,
2393 ARM2THUMB_GLUE_SECTION_NAME);
2397 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2399 s = bfd_make_section (bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
2402 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2403 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2405 /* FIXME: set appropriate bfd error */
2410 s = bfd_get_section_by_name (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2414 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2416 s = bfd_make_section (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2419 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2420 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2422 /* FIXME: set appropriate bfd error krk@cygnus.com */
2431 #include "coffcode.h"
2434 #ifdef TARGET_LITTLE_SYM
2437 armcoff_little_vec =
2440 #ifdef TARGET_LITTLE_NAME
2445 bfd_target_coff_flavour,
2446 BFD_ENDIAN_LITTLE, /* data byte order is little */
2447 BFD_ENDIAN_LITTLE, /* header byte order is little */
2449 (HAS_RELOC | EXEC_P | /* object flags */
2450 HAS_LINENO | HAS_DEBUG |
2451 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2453 #ifndef COFF_WITH_PE
2454 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
2456 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
2457 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
2460 #ifdef TARGET_UNDERSCORE
2461 TARGET_UNDERSCORE, /* leading underscore */
2463 0, /* leading underscore */
2465 '/', /* ar_pad_char */
2466 15, /* ar_max_namelen */
2468 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2469 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2470 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
2471 bfd_getl64, bfd_getl_signed_64, bfd_putl64,
2472 bfd_getl32, bfd_getl_signed_32, bfd_putl32,
2473 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
2475 /* Note that we allow an object file to be treated as a core file as well. */
2476 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2477 bfd_generic_archive_p, coff_object_p},
2478 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
2480 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
2481 _bfd_write_archive_contents, bfd_false},
2483 BFD_JUMP_TABLE_GENERIC (coff),
2484 BFD_JUMP_TABLE_COPY (coff),
2485 BFD_JUMP_TABLE_CORE (_bfd_nocore),
2486 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
2487 BFD_JUMP_TABLE_SYMBOLS (coff),
2488 BFD_JUMP_TABLE_RELOCS (coff),
2489 BFD_JUMP_TABLE_WRITE (coff),
2490 BFD_JUMP_TABLE_LINK (coff),
2491 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2493 (PTR) & bfd_coff_std_swap_table,
2497 #ifdef TARGET_BIG_SYM
2503 #ifdef TARGET_BIG_NAME
2508 bfd_target_coff_flavour,
2509 BFD_ENDIAN_BIG, /* data byte order is big */
2510 BFD_ENDIAN_BIG, /* header byte order is big */
2512 (HAS_RELOC | EXEC_P | /* object flags */
2513 HAS_LINENO | HAS_DEBUG |
2514 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
2516 #ifndef COFF_WITH_PE
2517 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
2519 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
2520 | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
2523 #ifdef TARGET_UNDERSCORE
2524 TARGET_UNDERSCORE, /* leading underscore */
2526 0, /* leading underscore */
2528 '/', /* ar_pad_char */
2529 15, /* ar_max_namelen */
2531 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2532 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2533 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
2534 bfd_getb64, bfd_getb_signed_64, bfd_putb64,
2535 bfd_getb32, bfd_getb_signed_32, bfd_putb32,
2536 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
2538 /* Note that we allow an object file to be treated as a core file as well. */
2539 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
2540 bfd_generic_archive_p, coff_object_p},
2541 {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
2543 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
2544 _bfd_write_archive_contents, bfd_false},
2546 BFD_JUMP_TABLE_GENERIC (coff),
2547 BFD_JUMP_TABLE_COPY (coff),
2548 BFD_JUMP_TABLE_CORE (_bfd_nocore),
2549 BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
2550 BFD_JUMP_TABLE_SYMBOLS (coff),
2551 BFD_JUMP_TABLE_RELOCS (coff),
2552 BFD_JUMP_TABLE_WRITE (coff),
2553 BFD_JUMP_TABLE_LINK (coff),
2554 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
2556 (PTR) & bfd_coff_std_swap_table,