1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
3 Free Software Foundation, Inc.
4 Written by Cygnus Support.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 #include "coff/internal.h"
36 /* Macros for manipulation the bits in the flags field of the coff data
38 #define APCS_26_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_26)
39 #define APCS_FLOAT_FLAG( abfd ) (coff_data (abfd)->flags & F_APCS_FLOAT)
40 #define PIC_FLAG( abfd ) (coff_data (abfd)->flags & F_PIC)
41 #define APCS_SET( abfd ) (coff_data (abfd)->flags & F_APCS_SET)
42 #define SET_APCS_FLAGS( abfd, flgs) (coff_data (abfd)->flags = \
43 (coff_data (abfd)->flags & ~ (F_APCS_26 | F_APCS_FLOAT | F_PIC)) \
44 | (flgs | F_APCS_SET))
45 #define INTERWORK_FLAG( abfd ) (coff_data (abfd)->flags & F_INTERWORK)
46 #define INTERWORK_SET( abfd ) (coff_data (abfd)->flags & F_INTERWORK_SET)
47 #define SET_INTERWORK_FLAG( abfd, flg ) (coff_data (abfd)->flags = \
48 (coff_data (abfd)->flags & ~ F_INTERWORK) \
49 | (flg | F_INTERWORK_SET))
52 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
55 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
56 /* some typedefs for holding instructions */
57 typedef unsigned long int insn32;
58 typedef unsigned short int insn16;
61 /* Forward declarations for stupid compilers. */
62 static boolean coff_arm_relocate_section
63 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
64 struct internal_reloc *, struct internal_syment *, asection **));
65 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
66 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
67 static bfd_reloc_status_type aoutarm_fix_pcrel_26
68 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
69 static bfd_reloc_status_type coff_thumb_pcrel_23
70 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
71 static bfd_reloc_status_type coff_thumb_pcrel_12
72 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
73 static bfd_reloc_status_type coff_thumb_pcrel_9
74 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
75 static bfd_reloc_status_type coff_arm_reloc
76 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
77 static boolean coff_arm_adjust_symndx
78 PARAMS ((bfd *, struct bfd_link_info *, bfd *,
79 asection *, struct internal_reloc *, boolean *));
80 static reloc_howto_type * coff_arm_rtype_to_howto
81 PARAMS ((bfd *, asection *, struct internal_reloc *,
82 struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
83 static bfd_reloc_status_type coff_thumb_pcrel_common
84 PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **,
85 thumb_pcrel_branchtype));
86 static CONST struct reloc_howto_struct * coff_arm_reloc_type_lookup
87 PARAMS ((bfd *, bfd_reloc_code_real_type));
88 static struct bfd_link_hash_table * coff_arm_link_hash_table_create
90 static insn32 insert_thumb_branch
91 PARAMS ((insn32, int));
92 static struct coff_link_hash_entry * find_thumb_glue
93 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
94 static struct coff_link_hash_entry * find_arm_glue
95 PARAMS ((struct bfd_link_info *, CONST char *, bfd *));
96 #ifndef COFF_IMAGE_WITH_PE
97 static void record_arm_to_thumb_glue
98 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
99 static void record_thumb_to_arm_glue
100 PARAMS ((struct bfd_link_info *, struct coff_link_hash_entry *));
102 static boolean coff_arm_merge_private_bfd_data
103 PARAMS ((bfd *, bfd *));
104 static boolean coff_arm_print_private_bfd_data
105 PARAMS ((bfd *, PTR));
106 static boolean _bfd_coff_arm_set_private_flags
107 PARAMS ((bfd *, flagword));
108 static boolean coff_arm_copy_private_bfd_data
109 PARAMS ((bfd *, bfd *));
110 static boolean coff_arm_is_local_label_name
111 PARAMS ((bfd *, const char *));
112 static boolean coff_arm_link_output_has_begun
113 PARAMS ((bfd *, struct coff_final_link_info *));
114 static boolean coff_arm_final_link_postscript
115 PARAMS ((bfd *, struct coff_final_link_info *));
117 /* The linker script knows the section names for placement.
118 The entry_names are used to do simple name mangling on the stubs.
119 Given a function name, and its type, the stub can be found. The
120 name can be changed. The only requirement is the %s be present.
123 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
124 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
126 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
127 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
129 /* Used by the assembler. */
130 static bfd_reloc_status_type
131 coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
134 arelent *reloc_entry;
135 asymbol *symbol ATTRIBUTE_UNUSED;
137 asection *input_section ATTRIBUTE_UNUSED;
139 char **error_message ATTRIBUTE_UNUSED;
142 if (output_bfd == (bfd *) NULL)
143 return bfd_reloc_continue;
145 diff = reloc_entry->addend;
148 x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
152 reloc_howto_type *howto = reloc_entry->howto;
153 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
159 char x = bfd_get_8 (abfd, addr);
161 bfd_put_8 (abfd, x, addr);
167 short x = bfd_get_16 (abfd, addr);
169 bfd_put_16 (abfd, x, addr);
175 long x = bfd_get_32 (abfd, addr);
177 bfd_put_32 (abfd, x, addr);
186 /* Now let bfd_perform_relocation finish everything up. */
187 return bfd_reloc_continue;
190 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
191 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
193 #ifndef TARGET_UNDERSCORE
194 #define TARGET_UNDERSCORE '_'
198 #define PCRELOFFSET true
201 /* These most certainly belong somewhere else. Just had to get rid of
202 the manifest constants in the code. */
216 #define ARM_THUMB9 12
217 #define ARM_THUMB12 13
218 #define ARM_THUMB23 14
220 static reloc_howto_type aoutarm_std_reloc_howto[] =
222 /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
223 HOWTO(ARM_8, /* type */
227 false, /* pc_relative */
229 complain_overflow_bitfield, /* complain_on_overflow */
230 coff_arm_reloc, /* special_function */
232 true, /* partial_inplace */
233 0x000000ff, /* src_mask */
234 0x000000ff, /* dst_mask */
235 PCRELOFFSET /* pcrel_offset */),
242 complain_overflow_bitfield,
255 complain_overflow_bitfield,
268 complain_overflow_signed,
269 aoutarm_fix_pcrel_26 ,
281 complain_overflow_signed,
294 complain_overflow_signed,
307 complain_overflow_signed,
320 complain_overflow_dont,
321 aoutarm_fix_pcrel_26_done,
335 complain_overflow_bitfield,
348 complain_overflow_bitfield,
361 complain_overflow_bitfield,
374 complain_overflow_signed,
387 complain_overflow_signed,
388 coff_thumb_pcrel_12 ,
400 complain_overflow_signed,
401 coff_thumb_pcrel_23 ,
409 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
412 /* Return true if this relocation should
413 appear in the output .reloc section. */
416 in_reloc_p (abfd, howto)
417 bfd * abfd ATTRIBUTE_UNUSED;
418 reloc_howto_type * howto;
420 return !howto->pc_relative && howto->type != ARM_RVA32;
424 #define RTYPE2HOWTO(cache_ptr, dst) \
425 (cache_ptr)->howto = \
426 (dst)->r_type < NUM_RELOCS \
427 ? aoutarm_std_reloc_howto + (dst)->r_type \
430 #define coff_rtype_to_howto coff_arm_rtype_to_howto
432 static reloc_howto_type *
433 coff_arm_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
434 bfd *abfd ATTRIBUTE_UNUSED;
436 struct internal_reloc *rel;
437 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
438 struct internal_syment *sym ATTRIBUTE_UNUSED;
441 reloc_howto_type * howto;
443 if (rel->r_type >= NUM_RELOCS)
446 howto = aoutarm_std_reloc_howto + rel->r_type;
448 if (rel->r_type == ARM_RVA32)
449 *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
453 /* Used by the assembler. */
455 static bfd_reloc_status_type
456 aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
457 output_bfd, error_message)
458 bfd *abfd ATTRIBUTE_UNUSED;
459 arelent *reloc_entry ATTRIBUTE_UNUSED;
460 asymbol *symbol ATTRIBUTE_UNUSED;
461 PTR data ATTRIBUTE_UNUSED;
462 asection *input_section ATTRIBUTE_UNUSED;
463 bfd *output_bfd ATTRIBUTE_UNUSED;
464 char **error_message ATTRIBUTE_UNUSED;
466 /* This is dead simple at present. */
470 /* Used by the assembler. */
472 static bfd_reloc_status_type
473 aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
474 output_bfd, error_message)
476 arelent *reloc_entry;
479 asection *input_section;
481 char **error_message ATTRIBUTE_UNUSED;
484 bfd_size_type addr = reloc_entry->address;
485 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
486 bfd_reloc_status_type flag = bfd_reloc_ok;
488 /* If this is an undefined symbol, return error */
489 if (symbol->section == &bfd_und_section
490 && (symbol->flags & BSF_WEAK) == 0)
491 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
493 /* If the sections are different, and we are doing a partial relocation,
494 just ignore it for now. */
495 if (symbol->section->name != input_section->name
496 && output_bfd != (bfd *)NULL)
497 return bfd_reloc_continue;
499 relocation = (target & 0x00ffffff) << 2;
500 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
501 relocation += symbol->value;
502 relocation += symbol->section->output_section->vma;
503 relocation += symbol->section->output_offset;
504 relocation += reloc_entry->addend;
505 relocation -= input_section->output_section->vma;
506 relocation -= input_section->output_offset;
510 return bfd_reloc_overflow;
512 /* Check for overflow */
513 if (relocation & 0x02000000)
515 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
516 flag = bfd_reloc_overflow;
518 else if (relocation & ~0x03ffffff)
519 flag = bfd_reloc_overflow;
521 target &= ~0x00ffffff;
522 target |= (relocation >> 2) & 0x00ffffff;
523 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
525 /* Now the ARM magic... Change the reloc type so that it is marked as done.
526 Strictly this is only necessary if we are doing a partial relocation. */
527 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
532 static bfd_reloc_status_type
533 coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data, input_section,
534 output_bfd, error_message, btype)
536 arelent *reloc_entry;
539 asection *input_section;
541 char **error_message ATTRIBUTE_UNUSED;
542 thumb_pcrel_branchtype btype;
544 bfd_vma relocation = 0;
545 bfd_size_type addr = reloc_entry->address;
546 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
547 bfd_reloc_status_type flag = bfd_reloc_ok;
552 /* NOTE: This routine is currently used by GAS, but not by the link
560 signbit = 0x00000100;
566 signbit = 0x00000800;
572 signbit = 0x00400000;
579 /* If this is an undefined symbol, return error */
580 if (symbol->section == &bfd_und_section
581 && (symbol->flags & BSF_WEAK) == 0)
582 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
584 /* If the sections are different, and we are doing a partial relocation,
585 just ignore it for now. */
586 if (symbol->section->name != input_section->name
587 && output_bfd != (bfd *)NULL)
588 return bfd_reloc_continue;
594 relocation = ((target & dstmsk) << 1);
598 if (bfd_big_endian (abfd))
599 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
601 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
608 relocation = (relocation ^ signbit) - signbit; /* Sign extend */
609 relocation += symbol->value;
610 relocation += symbol->section->output_section->vma;
611 relocation += symbol->section->output_offset;
612 relocation += reloc_entry->addend;
613 relocation -= input_section->output_section->vma;
614 relocation -= input_section->output_offset;
618 return bfd_reloc_overflow;
620 /* Check for overflow */
621 if (relocation & signbit)
623 if ((relocation & ~offmsk) != ~offmsk)
624 flag = bfd_reloc_overflow;
626 else if (relocation & ~offmsk)
627 flag = bfd_reloc_overflow;
634 target |= (relocation >> 1);
638 if (bfd_big_endian (abfd))
639 target |= ((relocation & 0xfff) >> 1) | ((relocation << 4) & 0x07ff0000);
641 target |= ((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff);
648 bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
650 /* Now the ARM magic... Change the reloc type so that it is marked as done.
651 Strictly this is only necessary if we are doing a partial relocation. */
652 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
654 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations */
658 static bfd_reloc_status_type
659 coff_thumb_pcrel_23 (abfd, reloc_entry, symbol, data, input_section,
660 output_bfd, error_message)
662 arelent *reloc_entry;
665 asection *input_section;
667 char **error_message;
669 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
670 input_section, output_bfd, error_message, b23);
673 static bfd_reloc_status_type
674 coff_thumb_pcrel_12 (abfd, reloc_entry, symbol, data, input_section,
675 output_bfd, error_message)
677 arelent *reloc_entry;
680 asection *input_section;
682 char **error_message;
684 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
685 input_section, output_bfd, error_message, b12);
688 static bfd_reloc_status_type
689 coff_thumb_pcrel_9 (abfd, reloc_entry, symbol, data, input_section,
690 output_bfd, error_message)
692 arelent *reloc_entry;
695 asection *input_section;
697 char **error_message;
699 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
700 input_section, output_bfd, error_message, b9);
704 static CONST struct reloc_howto_struct *
705 coff_arm_reloc_type_lookup (abfd, code)
707 bfd_reloc_code_real_type code;
709 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
711 if (code == BFD_RELOC_CTOR)
712 switch (bfd_get_arch_info (abfd)->bits_per_address)
717 default: return (CONST struct reloc_howto_struct *) 0;
722 ASTD (BFD_RELOC_8, ARM_8);
723 ASTD (BFD_RELOC_16, ARM_16);
724 ASTD (BFD_RELOC_32, ARM_32);
725 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
726 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
727 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
728 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
729 ASTD (BFD_RELOC_RVA, ARM_RVA32);
730 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
731 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
732 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
733 default: return (CONST struct reloc_howto_struct *) 0;
737 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
738 #define COFF_PAGE_SIZE 0x1000
739 /* Turn a howto into a reloc nunmber */
741 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
742 #define BADMAG(x) ARMBADMAG(x)
743 #define ARM 1 /* Customize coffcode.h */
745 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
746 This allows us to store global data here without actually creating any
747 global variables, which is a no-no in the BFD world. */
748 struct coff_arm_link_hash_table
750 /* The original coff_link_hash_table structure. MUST be first field. */
751 struct coff_link_hash_table root;
753 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
754 long int thumb_glue_size;
756 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
757 long int arm_glue_size;
759 /* An arbitary input BFD chosen to hold the glue sections. */
760 bfd * bfd_of_glue_owner;
762 /* Support interworking with old, non-interworking aware ARM code. */
763 int support_old_code;
766 /* Get the ARM coff linker hash table from a link_info structure. */
767 #define coff_arm_hash_table(info) \
768 ((struct coff_arm_link_hash_table *) ((info)->hash))
770 /* Create an ARM coff linker hash table. */
772 static struct bfd_link_hash_table *
773 coff_arm_link_hash_table_create (abfd)
776 struct coff_arm_link_hash_table * ret;
778 ret = ((struct coff_arm_link_hash_table *)
779 bfd_alloc (abfd, sizeof (struct coff_arm_link_hash_table)));
780 if (ret == (struct coff_arm_link_hash_table *) NULL)
783 if (! _bfd_coff_link_hash_table_init
784 (& ret->root, abfd, _bfd_coff_link_hash_newfunc))
786 bfd_release (abfd, ret);
787 return (struct bfd_link_hash_table *) NULL;
790 ret->thumb_glue_size = 0;
791 ret->arm_glue_size = 0;
792 ret->bfd_of_glue_owner = NULL;
794 return & ret->root.root;
798 arm_emit_base_file_entry (info, output_bfd, input_section, reloc_offset)
799 struct bfd_link_info *info;
801 asection *input_section;
802 bfd_vma reloc_offset;
804 bfd_vma addr = reloc_offset
806 + input_section->output_offset
807 + input_section->output_section->vma;
809 if (coff_data(output_bfd)->pe)
810 addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
811 fwrite (&addr, 1, sizeof (addr), (FILE *) info->base_file);
815 /* The thumb form of a long branch is a bit finicky, because the offset
816 encoding is split over two fields, each in it's own instruction. They
817 can occur in any order. So given a thumb form of long branch, and an
818 offset, insert the offset into the thumb branch and return finished
821 It takes two thumb instructions to encode the target address. Each has
822 11 bits to invest. The upper 11 bits are stored in one (identifed by
823 H-0.. see below), the lower 11 bits are stored in the other (identified
826 Combine together and shifted left by 1 (it's a half word address) and
830 H-0, upper address-0 = 000
832 H-1, lower address-0 = 800
834 They can be ordered either way, but the arm tools I've seen always put
835 the lower one first. It probably doesn't matter. krk@cygnus.com
837 XXX: Actually the order does matter. The second instruction (H-1)
838 moves the computed address into the PC, so it must be the second one
839 in the sequence. The problem, however is that whilst little endian code
840 stores the instructions in HI then LOW order, big endian code does the
841 reverse. nickc@cygnus.com */
843 #define LOW_HI_ORDER 0xF800F000
844 #define HI_LOW_ORDER 0xF000F800
847 insert_thumb_branch (br_insn, rel_off)
851 unsigned int low_bits;
852 unsigned int high_bits;
855 BFD_ASSERT((rel_off & 1) != 1);
857 rel_off >>= 1; /* half word aligned address */
858 low_bits = rel_off & 0x000007FF; /* the bottom 11 bits */
859 high_bits = (rel_off >> 11) & 0x000007FF; /* the top 11 bits */
861 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
862 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
863 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
864 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
866 abort(); /* error - not a valid branch instruction form */
868 /* FIXME: abort is probably not the right call. krk@cygnus.com */
874 static struct coff_link_hash_entry *
875 find_thumb_glue (info, name, input_bfd)
876 struct bfd_link_info * info;
881 struct coff_link_hash_entry * myh;
884 bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1));
886 BFD_ASSERT (tmp_name);
888 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
890 myh = coff_link_hash_lookup
891 (coff_hash_table (info), tmp_name, false, false, true);
894 /* xgettext:c-format */
895 _bfd_error_handler (_("%s: unable to find THUMB glue '%s' for `%s'"),
896 bfd_get_filename (input_bfd), tmp_name, name);
903 static struct coff_link_hash_entry *
904 find_arm_glue (info, name, input_bfd)
905 struct bfd_link_info * info;
910 struct coff_link_hash_entry * myh;
913 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
915 BFD_ASSERT (tmp_name);
917 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
919 myh = coff_link_hash_lookup
920 (coff_hash_table (info), tmp_name, false, false, true);
923 /* xgettext:c-format */
924 _bfd_error_handler (_("%s: unable to find ARM glue '%s' for `%s'"),
925 bfd_get_filename (input_bfd), tmp_name, name);
940 .word func @ behave as if you saw a ARM_32 reloc
943 #define ARM2THUMB_GLUE_SIZE 12
944 static const insn32 a2t1_ldr_insn = 0xe59fc000;
945 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
946 static const insn32 a2t3_func_addr_insn = 0x00000001;
949 Thumb->ARM: Thumb->(non-interworking aware) ARM
953 __func_from_thumb: __func_from_thumb:
955 nop ldr r6, __func_addr
957 __func_change_to_arm: bx r6
959 __func_back_to_thumb:
966 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
967 static const insn16 t2a1_bx_pc_insn = 0x4778;
968 static const insn16 t2a2_noop_insn = 0x46c0;
969 static const insn32 t2a3_b_insn = 0xea000000;
971 static const insn16 t2a1_push_insn = 0xb540;
972 static const insn16 t2a2_ldr_insn = 0x4e03;
973 static const insn16 t2a3_mov_insn = 0x46fe;
974 static const insn16 t2a4_bx_insn = 0x4730;
975 static const insn32 t2a5_pop_insn = 0xe8bd4040;
976 static const insn32 t2a6_bx_insn = 0xe12fff1e;
979 We should really create new local (static) symbols in destination
980 object for each stub we create. We should also create local
981 (static) symbols within the stubs when switching between ARM and
982 Thumb code. This will ensure that the debugger and disassembler
983 can present a better view of stubs.
985 We can treat stubs like literal sections, and for the THUMB9 ones
986 (short addressing range) we should be able to insert the stubs
987 between sections. i.e. the simplest approach (since relocations
988 are done on a section basis) is to dump the stubs at the end of
989 processing a section. That way we can always try and minimise the
990 offset to and from a stub. However, this does not map well onto
991 the way that the linker/BFD does its work: mapping all input
992 sections to output sections via the linker script before doing
995 Unfortunately it may be easier to just to disallow short range
996 Thumb->ARM stubs (i.e. no conditional inter-working branches,
997 only branch-and-link (BL) calls. This will simplify the processing
998 since we can then put all of the stubs into their own section.
1001 On a different subject, rather than complaining when a
1002 branch cannot fit in the number of bits available for the
1003 instruction we should generate a trampoline stub (needed to
1004 address the complete 32bit address space). */
1006 /* The standard COFF backend linker does not cope with the special
1007 Thumb BRANCH23 relocation. The alternative would be to split the
1008 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1009 bit simpler simply providing our own relocation driver. */
1011 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1012 This code is a very slightly modified copy of
1013 _bfd_coff_generic_relocate_section. It would be a much more
1014 maintainable solution to have a MACRO that could be expanded within
1015 _bfd_coff_generic_relocate_section that would only be provided for
1016 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1017 is different from the original. */
1020 coff_arm_relocate_section (output_bfd, info, input_bfd, input_section,
1021 contents, relocs, syms, sections)
1023 struct bfd_link_info *info;
1025 asection *input_section;
1027 struct internal_reloc *relocs;
1028 struct internal_syment *syms;
1029 asection **sections;
1031 struct internal_reloc * rel;
1032 struct internal_reloc * relend;
1035 relend = rel + input_section->reloc_count;
1037 for (; rel < relend; rel++)
1041 struct coff_link_hash_entry * h;
1042 struct internal_syment * sym;
1045 reloc_howto_type * howto;
1046 bfd_reloc_status_type rstat;
1049 symndx = rel->r_symndx;
1058 h = obj_coff_sym_hashes (input_bfd)[symndx];
1059 sym = syms + symndx;
1062 /* COFF treats common symbols in one of two ways. Either the
1063 size of the symbol is included in the section contents, or it
1064 is not. We assume that the size is not included, and force
1065 the rtype_to_howto function to adjust the addend as needed. */
1067 if (sym != NULL && sym->n_scnum != 0)
1068 addend = - sym->n_value;
1073 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1078 /* The relocation_section function will skip pcrel_offset relocs
1079 when doing a relocateable link. However, we want to convert
1080 ARM26 to ARM26D relocs if possible. We return a fake howto in
1081 this case without pcrel_offset set, and adjust the addend to
1083 if (rel->r_type == ARM_26
1085 && info->relocateable
1086 && (h->root.type == bfd_link_hash_defined
1087 || h->root.type == bfd_link_hash_defweak)
1088 && h->root.u.def.section->output_section == input_section->output_section)
1090 static reloc_howto_type fake_arm26_reloc =
1097 complain_overflow_signed,
1098 aoutarm_fix_pcrel_26 ,
1105 addend -= rel->r_vaddr - input_section->vma;
1106 howto = &fake_arm26_reloc;
1109 /* If we are doing a relocateable link, then we can just ignore
1110 a PC relative reloc that is pcrel_offset. It will already
1111 have the correct value. If this is not a relocateable link,
1112 then we should ignore the symbol value. */
1113 if (howto->pc_relative && howto->pcrel_offset)
1115 if (info->relocateable)
1117 if (sym != NULL && sym->n_scnum != 0)
1118 addend += sym->n_value;
1129 sec = bfd_abs_section_ptr;
1134 sec = sections[symndx];
1135 val = (sec->output_section->vma
1136 + sec->output_offset
1143 #if 1 /* THUMBEXTENSION */
1144 /* We don't output the stubs if we are generating a
1145 relocatable output file, since we may as well leave the
1146 stub generation to the final linker pass. If we fail to
1147 verify that the name is defined, we'll try to build stubs
1148 for an undefined name... */
1149 if (! info->relocateable
1150 && ( h->root.type == bfd_link_hash_defined
1151 || h->root.type == bfd_link_hash_defweak))
1153 asection * h_sec = h->root.u.def.section;
1154 const char * name = h->root.root.string;
1156 /* h locates the symbol referenced in the reloc. */
1157 h_val = (h->root.u.def.value
1158 + h_sec->output_section->vma
1159 + h_sec->output_offset);
1161 if (howto->type == ARM_26)
1163 if ( h->class == C_THUMBSTATFUNC
1164 || h->class == C_THUMBEXTFUNC)
1166 /* Arm code calling a Thumb function */
1167 unsigned long int tmp;
1170 long int ret_offset;
1171 struct coff_link_hash_entry * myh;
1172 struct coff_arm_link_hash_table * globals;
1174 myh = find_arm_glue (info, name, input_bfd);
1178 globals = coff_arm_hash_table (info);
1180 BFD_ASSERT (globals != NULL);
1181 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1183 my_offset = myh->root.u.def.value;
1185 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1186 ARM2THUMB_GLUE_SECTION_NAME);
1187 BFD_ASSERT (s != NULL);
1188 BFD_ASSERT (s->contents != NULL);
1189 BFD_ASSERT (s->output_section != NULL);
1191 if ((my_offset & 0x01) == 0x01)
1193 if (h_sec->owner != NULL
1194 && INTERWORK_SET (h_sec->owner)
1195 && ! INTERWORK_FLAG (h_sec->owner))
1198 /* xgettext:c-format */
1199 (_("%s(%s): warning: interworking not enabled."),
1200 bfd_get_filename (h_sec->owner), name);
1202 /* xgettext:c-format */
1203 (_(" first occurrence: %s: arm call to thumb"),
1204 bfd_get_filename (input_bfd));
1208 myh->root.u.def.value = my_offset;
1210 bfd_put_32 (output_bfd, a2t1_ldr_insn,
1211 s->contents + my_offset);
1213 bfd_put_32 (output_bfd, a2t2_bx_r12_insn,
1214 s->contents + my_offset + 4);
1216 /* It's a thumb address. Add the low order bit. */
1217 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1218 s->contents + my_offset + 8);
1220 if (info->base_file)
1221 arm_emit_base_file_entry (info, output_bfd, s,
1226 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1228 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1229 - input_section->vma);
1231 tmp = tmp & 0xFF000000;
1233 /* Somehow these are both 4 too far, so subtract 8. */
1237 + s->output_section->vma
1238 - (input_section->output_offset
1239 + input_section->output_section->vma
1243 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1245 bfd_put_32 (output_bfd, tmp, contents + rel->r_vaddr
1246 - input_section->vma);
1251 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12 */
1252 else if (howto->type == ARM_THUMB23)
1254 if ( h->class == C_EXT
1255 || h->class == C_STAT
1256 || h->class == C_LABEL)
1258 /* Thumb code calling an ARM function */
1261 unsigned long int tmp;
1262 long int ret_offset;
1263 struct coff_link_hash_entry * myh;
1264 struct coff_arm_link_hash_table * globals;
1266 myh = find_thumb_glue (info, name, input_bfd);
1270 globals = coff_arm_hash_table (info);
1272 BFD_ASSERT (globals != NULL);
1273 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1275 my_offset = myh->root.u.def.value;
1277 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1278 THUMB2ARM_GLUE_SECTION_NAME);
1280 BFD_ASSERT (s != NULL);
1281 BFD_ASSERT (s->contents != NULL);
1282 BFD_ASSERT (s->output_section != NULL);
1284 if ((my_offset & 0x01) == 0x01)
1286 if (h_sec->owner != NULL
1287 && INTERWORK_SET (h_sec->owner)
1288 && ! INTERWORK_FLAG (h_sec->owner)
1289 && ! globals->support_old_code)
1292 /* xgettext:c-format */
1293 (_("%s(%s): warning: interworking not enabled."),
1294 bfd_get_filename (h_sec->owner), name);
1296 /* xgettext:c-format */
1297 (_(" first occurrence: %s: thumb call to arm"),
1298 bfd_get_filename (input_bfd));
1300 (_(" consider relinking with --support-old-code enabled"));
1304 myh->root.u.def.value = my_offset;
1306 if (globals->support_old_code)
1308 bfd_put_16 (output_bfd, t2a1_push_insn,
1309 s->contents + my_offset);
1311 bfd_put_16 (output_bfd, t2a2_ldr_insn,
1312 s->contents + my_offset + 2);
1314 bfd_put_16 (output_bfd, t2a3_mov_insn,
1315 s->contents + my_offset + 4);
1317 bfd_put_16 (output_bfd, t2a4_bx_insn,
1318 s->contents + my_offset + 6);
1320 bfd_put_32 (output_bfd, t2a5_pop_insn,
1321 s->contents + my_offset + 8);
1323 bfd_put_32 (output_bfd, t2a6_bx_insn,
1324 s->contents + my_offset + 12);
1326 /* Store the address of the function in the last word of the stub. */
1327 bfd_put_32 (output_bfd, h_val,
1328 s->contents + my_offset + 16);
1330 if (info->base_file)
1331 arm_emit_base_file_entry (info, output_bfd, s, my_offset + 16);
1335 bfd_put_16 (output_bfd, t2a1_bx_pc_insn,
1336 s->contents + my_offset);
1338 bfd_put_16 (output_bfd, t2a2_noop_insn,
1339 s->contents + my_offset + 2);
1342 ((bfd_signed_vma) h_val) /* Address of destination of the stub */
1344 (s->output_offset /* Offset from the start of the current section to the start of the stubs. */
1345 + my_offset /* Offset of the start of this stub from the start of the stubs. */
1346 + s->output_section->vma) /* Address of the start of the current section. */
1347 + 4 /* The branch instruction is 4 bytes into the stub. */
1348 + 8); /* ARM branches work from the pc of the instruction + 8. */
1350 bfd_put_32 (output_bfd,
1351 t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1352 s->contents + my_offset + 4);
1357 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1359 /* Now go back and fix up the original BL insn to point
1364 - (input_section->output_offset
1368 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1369 - input_section->vma);
1371 bfd_put_32 (output_bfd,
1372 insert_thumb_branch (tmp, ret_offset),
1373 contents + rel->r_vaddr
1374 - input_section->vma);
1381 /* If the relocation type and destination symbol does not
1382 fall into one of the above categories, then we can just
1383 perform a direct link. */
1386 rstat = bfd_reloc_ok;
1388 #endif /* THUMBEXTENSION */
1389 if ( h->root.type == bfd_link_hash_defined
1390 || h->root.type == bfd_link_hash_defweak)
1394 sec = h->root.u.def.section;
1395 val = (h->root.u.def.value
1396 + sec->output_section->vma
1397 + sec->output_offset);
1400 else if (! info->relocateable)
1402 if (! ((*info->callbacks->undefined_symbol)
1403 (info, h->root.root.string, input_bfd, input_section,
1404 rel->r_vaddr - input_section->vma)))
1409 if (info->base_file)
1411 /* Emit a reloc if the backend thinks it needs it. */
1412 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1413 arm_emit_base_file_entry (info, output_bfd, input_section, rel->r_vaddr);
1416 #if 1 /* THUMBEXTENSION */
1418 rstat = bfd_reloc_ok;
1419 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1420 else if (! info->relocateable
1421 && howto->type == ARM_THUMB23)
1423 /* This is pretty much a copy of what the default
1424 _bfd_final_link_relocate and _bfd_relocate_contents
1425 routines do to perform a relocation, with special
1426 processing for the split addressing of the Thumb BL
1427 instruction. Again, it would probably be simpler adding a
1428 ThumbBRANCH23 specific macro expansion into the default
1431 bfd_vma address = rel->r_vaddr - input_section->vma;
1433 if (address > input_section->_raw_size)
1434 rstat = bfd_reloc_outofrange;
1437 bfd_vma relocation = val + addend;
1438 int size = bfd_get_reloc_size (howto);
1439 boolean overflow = false;
1440 bfd_byte * location = contents + address;
1441 bfd_vma x = bfd_get_32 (input_bfd, location);
1442 bfd_vma src_mask = 0x007FFFFE;
1443 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1444 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1446 bfd_signed_vma signed_check;
1448 bfd_signed_vma signed_add;
1450 BFD_ASSERT (size == 4);
1452 /* howto->pc_relative should be TRUE for type 14 BRANCH23 */
1453 relocation -= (input_section->output_section->vma
1454 + input_section->output_offset);
1456 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23 */
1457 relocation -= address;
1459 /* No need to negate the relocation with BRANCH23. */
1460 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1461 /* howto->rightshift == 1 */
1462 /* Drop unwanted bits from the value we are relocating to. */
1464 check = relocation >> howto->rightshift;
1466 /* If this is a signed value, the rightshift just dropped
1467 leading 1 bits (assuming twos complement). */
1468 if ((bfd_signed_vma) relocation >= 0)
1469 signed_check = check;
1471 signed_check = (check
1473 & ~((bfd_vma) - 1 >> howto->rightshift)));
1475 /* Get the value from the object file. */
1476 if (bfd_big_endian (input_bfd))
1478 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1482 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1485 /* Get the value from the object file with an appropriate sign.
1486 The expression involving howto->src_mask isolates the upper
1487 bit of src_mask. If that bit is set in the value we are
1488 adding, it is negative, and we subtract out that number times
1489 two. If src_mask includes the highest possible bit, then we
1490 can not get the upper bit, but that does not matter since
1491 signed_add needs no adjustment to become negative in that
1496 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1497 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1499 /* Add the value from the object file, shifted so that it is a
1501 /* howto->bitpos == 0 */
1503 signed_check += signed_add;
1504 relocation += signed_add;
1506 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1508 /* Assumes two's complement. */
1509 if ( signed_check > reloc_signed_max
1510 || signed_check < reloc_signed_min)
1513 /* Put RELOCATION into the correct bits: */
1515 if (bfd_big_endian (input_bfd))
1517 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1521 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1524 /* Add RELOCATION to the correct bits of X: */
1525 x = ((x & ~howto->dst_mask) | relocation);
1527 /* Put the relocated value back in the object file: */
1528 bfd_put_32 (input_bfd, x, location);
1530 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1534 #endif /* THUMBEXTENSION */
1535 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1537 rel->r_vaddr - input_section->vma,
1539 #if 1 /* THUMBEXTENSION */
1541 Is this the best way to fix up thumb addresses? krk@cygnus.com
1542 Probably not, but it works, and if it works it don't need fixing! nickc@cygnus.com */
1543 /* Only perform this fix during the final link, not a relocatable link. nickc@cygnus.com */
1544 if (! info->relocateable
1545 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1547 /* Determine if we need to set the bottom bit of a relocated address
1548 because the address is the address of a Thumb code symbol. */
1550 int patchit = false;
1553 && ( h->class == C_THUMBSTATFUNC
1554 || h->class == C_THUMBEXTFUNC))
1558 else if (sym != NULL
1559 && sym->n_scnum > N_UNDEF)
1561 /* No hash entry - use the symbol instead. */
1563 if ( sym->n_sclass == C_THUMBSTATFUNC
1564 || sym->n_sclass == C_THUMBEXTFUNC)
1570 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1571 bfd_vma x = bfd_get_32 (input_bfd, location);
1573 bfd_put_32 (input_bfd, x | 1, location);
1576 #endif /* THUMBEXTENSION */
1584 case bfd_reloc_outofrange:
1585 (*_bfd_error_handler)
1586 (_("%s: bad reloc address 0x%lx in section `%s'"),
1587 bfd_get_filename (input_bfd),
1588 (unsigned long) rel->r_vaddr,
1589 bfd_get_section_name (input_bfd, input_section));
1591 case bfd_reloc_overflow:
1594 char buf[SYMNMLEN + 1];
1599 name = h->root.root.string;
1602 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1607 if (! ((*info->callbacks->reloc_overflow)
1608 (info, name, howto->name, (bfd_vma) 0, input_bfd,
1609 input_section, rel->r_vaddr - input_section->vma)))
1618 #ifndef COFF_IMAGE_WITH_PE
1621 bfd_arm_allocate_interworking_sections (info)
1622 struct bfd_link_info * info;
1626 struct coff_arm_link_hash_table * globals;
1628 static char test_char = '1';
1631 globals = coff_arm_hash_table (info);
1633 BFD_ASSERT (globals != NULL);
1635 if (globals->arm_glue_size != 0)
1637 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1639 s = bfd_get_section_by_name
1640 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1642 BFD_ASSERT (s != NULL);
1644 foo = (bfd_byte *) bfd_alloc
1645 (globals->bfd_of_glue_owner, globals->arm_glue_size);
1647 memset (foo, test_char, globals->arm_glue_size);
1650 s->_raw_size = s->_cooked_size = globals->arm_glue_size;
1654 if (globals->thumb_glue_size != 0)
1656 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1658 s = bfd_get_section_by_name
1659 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1661 BFD_ASSERT (s != NULL);
1663 foo = (bfd_byte *) bfd_alloc
1664 (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1666 memset (foo, test_char, globals->thumb_glue_size);
1669 s->_raw_size = s->_cooked_size = globals->thumb_glue_size;
1677 record_arm_to_thumb_glue (info, h)
1678 struct bfd_link_info * info;
1679 struct coff_link_hash_entry * h;
1681 const char * name = h->root.root.string;
1682 register asection * s;
1684 struct coff_link_hash_entry * myh;
1685 struct coff_arm_link_hash_table * globals;
1687 globals = coff_arm_hash_table (info);
1689 BFD_ASSERT (globals != NULL);
1690 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1692 s = bfd_get_section_by_name
1693 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1695 BFD_ASSERT (s != NULL);
1697 tmp_name = ((char *)
1698 bfd_malloc (strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1));
1700 BFD_ASSERT (tmp_name);
1702 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1704 myh = coff_link_hash_lookup
1705 (coff_hash_table (info), tmp_name, false, false, true);
1710 return; /* we've already seen this guy */
1713 /* The only trick here is using globals->arm_glue_size as the value. Even
1714 though the section isn't allocated yet, this is where we will be putting
1717 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1719 s, globals->arm_glue_size + 1,
1721 (struct bfd_link_hash_entry **) & myh);
1725 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1731 record_thumb_to_arm_glue (info, h)
1732 struct bfd_link_info * info;
1733 struct coff_link_hash_entry * h;
1735 const char * name = h->root.root.string;
1736 register asection * s;
1738 struct coff_link_hash_entry * myh;
1739 struct coff_arm_link_hash_table * globals;
1742 globals = coff_arm_hash_table (info);
1744 BFD_ASSERT (globals != NULL);
1745 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1747 s = bfd_get_section_by_name
1748 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1750 BFD_ASSERT (s != NULL);
1752 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1);
1754 BFD_ASSERT (tmp_name);
1756 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1758 myh = coff_link_hash_lookup
1759 (coff_hash_table (info), tmp_name, false, false, true);
1764 return; /* we've already seen this guy */
1767 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1768 BSF_GLOBAL, s, globals->thumb_glue_size + 1,
1770 (struct bfd_link_hash_entry **) & myh);
1772 /* If we mark it 'thumb', the disassembler will do a better job. */
1773 myh->class = C_THUMBEXTFUNC;
1777 /* Allocate another symbol to mark where we switch to arm mode. */
1779 #define CHANGE_TO_ARM "__%s_change_to_arm"
1780 #define BACK_FROM_ARM "__%s_back_from_arm"
1782 tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1);
1784 BFD_ASSERT (tmp_name);
1786 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1790 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1791 BSF_LOCAL, s, globals->thumb_glue_size
1792 + (globals->support_old_code ? 8 : 4),
1794 (struct bfd_link_hash_entry **) & myh);
1798 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1803 /* Select a BFD to be used to hold the sections used by the glue code.
1804 This function is called from the linker scripts in ld/emultempl/
1808 bfd_arm_get_bfd_for_interworking (abfd, info)
1810 struct bfd_link_info * info;
1812 struct coff_arm_link_hash_table * globals;
1816 /* If we are only performing a partial link do not bother
1817 getting a bfd to hold the glue. */
1818 if (info->relocateable)
1821 globals = coff_arm_hash_table (info);
1823 BFD_ASSERT (globals != NULL);
1825 if (globals->bfd_of_glue_owner != NULL)
1828 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1832 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1834 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1837 || ! bfd_set_section_flags (abfd, sec, flags)
1838 || ! bfd_set_section_alignment (abfd, sec, 2))
1842 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1846 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1848 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1851 || ! bfd_set_section_flags (abfd, sec, flags)
1852 || ! bfd_set_section_alignment (abfd, sec, 2))
1856 /* Save the bfd for later use. */
1857 globals->bfd_of_glue_owner = abfd;
1863 bfd_arm_process_before_allocation (abfd, info, support_old_code)
1865 struct bfd_link_info * info;
1866 int support_old_code;
1869 struct coff_arm_link_hash_table * globals;
1871 /* If we are only performing a partial link do not bother
1872 to construct any glue. */
1873 if (info->relocateable)
1876 /* Here we have a bfd that is to be included on the link. We have a hook
1877 to do reloc rummaging, before section sizes are nailed down. */
1879 _bfd_coff_get_external_symbols (abfd);
1881 globals = coff_arm_hash_table (info);
1883 BFD_ASSERT (globals != NULL);
1884 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1886 globals->support_old_code = support_old_code;
1888 /* Rummage around all the relocs and map the glue vectors. */
1889 sec = abfd->sections;
1894 for (; sec != NULL; sec = sec->next)
1896 struct internal_reloc * i;
1897 struct internal_reloc * rel;
1899 if (sec->reloc_count == 0)
1902 /* Load the relocs. */
1903 /* FIXME: there may be a storage leak here. */
1905 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
1907 BFD_ASSERT (i != 0);
1909 for (rel = i; rel < i + sec->reloc_count; ++rel)
1911 unsigned short r_type = rel->r_type;
1912 unsigned long symndx;
1913 struct coff_link_hash_entry * h;
1915 symndx = rel->r_symndx;
1917 /* If the relocation is not against a symbol it cannot concern us. */
1921 if (symndx >= obj_conv_table_size (abfd))
1923 _bfd_error_handler (_("%s: illegal symbol index in reloc: %d"),
1924 bfd_get_filename (abfd), symndx);
1928 h = obj_coff_sym_hashes (abfd)[symndx];
1930 /* If the relocation is against a static symbol it must be within
1931 the current section and so cannot be a cross ARM/Thumb relocation. */
1938 /* This one is a call from arm code. We need to look up
1939 the target of the call. If it is a thumb target, we
1942 if (h->class == C_THUMBEXTFUNC)
1943 record_arm_to_thumb_glue (info, h);
1947 /* This one is a call from thumb code. We used to look
1948 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
1949 up the target of the call. If it is an arm target, we
1950 insert glue. If the symbol does not exist it will be
1951 given a class of C_EXT and so we will generate a stub
1952 for it. This is not really a problem, since the link
1953 is doomed anyway. */
1960 record_thumb_to_arm_glue (info, h);
1976 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
1978 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
1979 #define coff_relocate_section coff_arm_relocate_section
1980 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
1981 #define coff_adjust_symndx coff_arm_adjust_symndx
1982 #define coff_link_output_has_begun coff_arm_link_output_has_begun
1983 #define coff_final_link_postscript coff_arm_final_link_postscript
1984 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
1985 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
1986 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
1987 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
1988 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
1991 /* When doing a relocateable link, we want to convert ARM26 relocs
1992 into ARM26D relocs. */
1995 coff_arm_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
1996 bfd *obfd ATTRIBUTE_UNUSED;
1997 struct bfd_link_info *info ATTRIBUTE_UNUSED;
2000 struct internal_reloc *irel;
2003 if (irel->r_type == 3)
2005 struct coff_link_hash_entry *h;
2007 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2009 && (h->root.type == bfd_link_hash_defined
2010 || h->root.type == bfd_link_hash_defweak)
2011 && h->root.u.def.section->output_section == sec->output_section)
2018 /* Called when merging the private data areas of two BFDs.
2019 This is important as it allows us to detect if we are
2020 attempting to merge binaries compiled for different ARM
2021 targets, eg different CPUs or differents APCS's. */
2024 coff_arm_merge_private_bfd_data (ibfd, obfd)
2028 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2033 /* If the two formats are different we cannot merge anything.
2034 This is not an error, since it is permissable to change the
2035 input and output formats. */
2036 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2037 || obfd->xvec->flavour != bfd_target_coff_flavour)
2040 /* Verify that the APCS is the same for the two BFDs */
2041 if (APCS_SET (ibfd))
2043 if (APCS_SET (obfd))
2045 /* If the src and dest have different APCS flag bits set, fail. */
2046 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2049 /* xgettext: c-format */
2050 (_("%s: ERROR: compiled for APCS-%d whereas target %s uses APCS-%d"),
2051 bfd_get_filename (ibfd), APCS_26_FLAG (ibfd) ? 26 : 32,
2052 bfd_get_filename (obfd), APCS_26_FLAG (obfd) ? 26 : 32
2055 bfd_set_error (bfd_error_wrong_format);
2059 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2063 if (APCS_FLOAT_FLAG (ibfd))
2064 /* xgettext: c-format */
2065 msg = _("%s: ERROR: passes floats in float registers whereas target %s uses integer registers");
2067 /* xgettext: c-format */
2068 msg = _("%s: ERROR: passes floats in integer registers whereas target %s uses float registers");
2070 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2071 bfd_get_filename (obfd));
2073 bfd_set_error (bfd_error_wrong_format);
2077 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2081 if (PIC_FLAG (ibfd))
2082 /* xgettext: c-format */
2083 msg = _("%s: ERROR: compiled as position independent code, whereas target %s is absolute position");
2085 /* xgettext: c-format */
2086 msg = _("%s: ERROR: compiled as absolute position code, whereas target %s is position independent");
2087 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2088 bfd_get_filename (obfd));
2090 bfd_set_error (bfd_error_wrong_format);
2096 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2098 /* Set up the arch and fields as well as these are probably wrong. */
2099 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2103 /* Check the interworking support. */
2104 if (INTERWORK_SET (ibfd))
2106 if (INTERWORK_SET (obfd))
2108 /* If the src and dest differ in their interworking issue a warning. */
2109 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2113 if (INTERWORK_FLAG (ibfd))
2114 /* xgettext: c-format */
2115 msg = _("Warning: input file %s supports interworking, whereas %s does not.");
2117 /* xgettext: c-format */
2118 msg = _("Warning: input file %s does not support interworking, whereas %s does.");
2120 _bfd_error_handler (msg, bfd_get_filename (ibfd),
2121 bfd_get_filename (obfd));
2126 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2134 /* Display the flags field. */
2137 coff_arm_print_private_bfd_data (abfd, ptr)
2141 FILE * file = (FILE *) ptr;
2143 BFD_ASSERT (abfd != NULL && ptr != NULL);
2145 /* xgettext:c-format */
2146 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2148 if (APCS_SET (abfd))
2150 /* xgettext: APCS is ARM Prodecure Call Standard, it should not be translated. */
2151 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2153 if (APCS_FLOAT_FLAG (abfd))
2154 fprintf (file, _(" [floats passed in float registers]"));
2156 fprintf (file, _(" [floats passed in integer registers]"));
2158 if (PIC_FLAG (abfd))
2159 fprintf (file, _(" [position independent]"));
2161 fprintf (file, _(" [absolute position]"));
2164 if (! INTERWORK_SET (abfd))
2165 fprintf (file, _(" [interworking flag not initialised]"));
2166 else if (INTERWORK_FLAG (abfd))
2167 fprintf (file, _(" [interworking supported]"));
2169 fprintf (file, _(" [interworking not supported]"));
2177 /* Copies the given flags into the coff_tdata.flags field.
2178 Typically these flags come from the f_flags[] field of
2179 the COFF filehdr structure, which contains important,
2180 target specific information.
2181 Note: Although this function is static, it is explicitly
2182 called from both coffcode.h and peicode.h. */
2185 _bfd_coff_arm_set_private_flags (abfd, flags)
2191 BFD_ASSERT (abfd != NULL);
2193 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2195 /* Make sure that the APCS field has not been initialised to the opposite
2198 && ( (APCS_26_FLAG (abfd) != flag)
2199 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2200 || (PIC_FLAG (abfd) != (flags & F_PIC))
2204 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2206 SET_APCS_FLAGS (abfd, flag);
2208 flag = (flags & F_INTERWORK);
2210 /* If the BFD has already had its interworking flag set, but it
2211 is different from the value that we have been asked to set,
2212 then assume that that merged code will not support interworking
2213 and set the flag accordingly. */
2214 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2217 /* xgettext: c-format */
2218 _bfd_error_handler (_("Warning: Not setting interworking flag of %s, since it has already been specified as non-interworking"),
2219 bfd_get_filename (abfd));
2221 /* xgettext: c-format */
2222 _bfd_error_handler (_("Warning: Clearing the interworking flag of %s due to outside request"),
2223 bfd_get_filename (abfd));
2227 SET_INTERWORK_FLAG (abfd, flag);
2233 /* Copy the important parts of the target specific data
2234 from one instance of a BFD to another. */
2237 coff_arm_copy_private_bfd_data (src, dest)
2241 BFD_ASSERT (src != NULL && dest != NULL);
2246 /* If the destination is not in the same format as the source, do not do
2248 if (src->xvec != dest->xvec)
2251 /* copy the flags field */
2254 if (APCS_SET (dest))
2256 /* If the src and dest have different APCS flag bits set, fail. */
2257 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2260 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2263 if (PIC_FLAG (dest) != PIC_FLAG (src))
2267 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2271 if (INTERWORK_SET (src))
2273 if (INTERWORK_SET (dest))
2275 /* If the src and dest have different interworking flags then turn
2276 off the interworking bit. */
2277 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2279 if (INTERWORK_FLAG (dest))
2281 /* xgettext:c-format */
2282 _bfd_error_handler (("Warning: Clearing the interworking bit of %s, because the non-interworking code in %s has been copied into it"),
2283 bfd_get_filename (dest),
2284 bfd_get_filename (src));
2287 SET_INTERWORK_FLAG (dest, 0);
2292 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2299 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2300 *must* match the definitions in gcc/config/arm/coff.h and semi.h */
2301 #define LOCAL_LABEL_PREFIX "."
2302 #ifndef USER_LABEL_PREFIX
2303 #define USER_LABEL_PREFIX "_"
2306 /* Like _bfd_coff_is_local_label_name, but
2307 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2309 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2310 labels of the form Lxxx to be stripped. */
2312 coff_arm_is_local_label_name (abfd, name)
2313 bfd * abfd ATTRIBUTE_UNUSED;
2316 #ifdef USER_LABEL_PREFIX
2317 if (USER_LABEL_PREFIX[0] != 0)
2319 if (strncmp (name, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)) == 0)
2324 #ifdef LOCAL_LABEL_PREFIX
2325 /* If there is a prefix for local labels then look for this.
2326 If the prefix exists, but it is empty, then ignore the test. */
2328 if (LOCAL_LABEL_PREFIX[0] != 0)
2330 int len = strlen (LOCAL_LABEL_PREFIX);
2332 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2335 /* Perform the checks below for the rest of the name. */
2340 return name[0] == 'L';
2343 /* This piece of machinery exists only to guarantee that the bfd that holds
2344 the glue section is written last.
2346 This does depend on bfd_make_section attaching a new section to the
2347 end of the section list for the bfd.
2352 coff_arm_link_output_has_begun (sub, info)
2354 struct coff_final_link_info * info;
2356 return (sub->output_has_begun
2357 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2361 coff_arm_final_link_postscript (abfd, pfinfo)
2362 bfd * abfd ATTRIBUTE_UNUSED;
2363 struct coff_final_link_info * pfinfo;
2365 struct coff_arm_link_hash_table * globals;
2367 globals = coff_arm_hash_table (pfinfo->info);
2369 BFD_ASSERT (globals != NULL);
2371 if (globals->bfd_of_glue_owner != NULL)
2373 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2376 globals->bfd_of_glue_owner->output_has_begun = true;
2383 #define coff_SWAP_sym_in arm_bfd_coff_swap_sym_in
2385 static void coff_swap_sym_in PARAMS ((bfd *, PTR, PTR));
2387 /* Sepcial version of symbol swapper, used to grab a bfd
2388 onto which the glue sections can be attached. */
2390 arm_bfd_coff_swap_sym_in (abfd, ext1, in1)
2396 register asection * s;
2398 /* Do the normal swap in. */
2399 coff_swap_sym_in (abfd, ext1, in1);
2401 if (bfd_of_glue_owner != NULL) /* we already have a toc, so go home */
2404 /* Save the bfd for later allocation. */
2405 bfd_of_glue_owner = abfd;
2407 s = bfd_get_section_by_name (bfd_of_glue_owner ,
2408 ARM2THUMB_GLUE_SECTION_NAME);
2412 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2414 s = bfd_make_section (bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
2417 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2418 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2420 /* FIXME: set appropriate bfd error */
2425 s = bfd_get_section_by_name (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2429 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY ;
2431 s = bfd_make_section (bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
2434 || !bfd_set_section_flags (bfd_of_glue_owner, s, flags)
2435 || !bfd_set_section_alignment (bfd_of_glue_owner, s, 2))
2437 /* FIXME: set appropriate bfd error krk@cygnus.com */
2446 #include "coffcode.h"
2448 #ifndef TARGET_LITTLE_SYM
2449 #define TARGET_LITTLE_SYM armcoff_little_vec
2451 #ifndef TARGET_LITTLE_NAME
2452 #define TARGET_LITTLE_NAME "coff-arm-little"
2454 #ifndef TARGET_BIG_SYM
2455 #define TARGET_BIG_SYM armcoff_big_vec
2457 #ifndef TARGET_BIG_NAME
2458 #define TARGET_BIG_NAME "coff-arm-big"
2461 #ifndef TARGET_UNDERSCORE
2462 #define TARGET_UNDERSCORE 0
2466 #define EXTRA_S_FLAGS (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2468 #define EXTRA_S_FLAGS 0
2471 /* Forward declaration for use initialising alternative_target field. */
2472 extern const bfd_target TARGET_BIG_SYM ;
2474 /* Target vectors. */
2475 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM)
2476 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM)