1 /* BFD back-end for ARM COFF files.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005, 2006
4 Free Software Foundation, Inc.
5 Written by Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
27 #include "coff/internal.h"
35 /* Macros for manipulation the bits in the flags field of the coff data
37 #define APCS_26_FLAG(abfd) \
38 (coff_data (abfd)->flags & F_APCS_26)
40 #define APCS_FLOAT_FLAG(abfd) \
41 (coff_data (abfd)->flags & F_APCS_FLOAT)
43 #define PIC_FLAG(abfd) \
44 (coff_data (abfd)->flags & F_PIC)
46 #define APCS_SET(abfd) \
47 (coff_data (abfd)->flags & F_APCS_SET)
49 #define SET_APCS_FLAGS(abfd, flgs) \
52 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
53 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
57 #define INTERWORK_FLAG(abfd) \
58 (coff_data (abfd)->flags & F_INTERWORK)
60 #define INTERWORK_SET(abfd) \
61 (coff_data (abfd)->flags & F_INTERWORK_SET)
63 #define SET_INTERWORK_FLAG(abfd, flg) \
66 coff_data (abfd)->flags &= ~F_INTERWORK; \
67 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
72 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
75 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
76 /* Some typedefs for holding instructions. */
77 typedef unsigned long int insn32;
78 typedef unsigned short int insn16;
80 /* The linker script knows the section names for placement.
81 The entry_names are used to do simple name mangling on the stubs.
82 Given a function name, and its type, the stub can be found. The
83 name can be changed. The only requirement is the %s be present. */
85 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
86 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
88 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
89 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
91 /* Used by the assembler. */
93 static bfd_reloc_status_type
94 coff_arm_reloc (bfd *abfd,
96 asymbol *symbol ATTRIBUTE_UNUSED,
98 asection *input_section ATTRIBUTE_UNUSED,
100 char **error_message ATTRIBUTE_UNUSED)
104 if (output_bfd == NULL)
105 return bfd_reloc_continue;
107 diff = reloc_entry->addend;
110 x = ((x & ~howto->dst_mask) \
111 | (((x & howto->src_mask) + diff) & howto->dst_mask))
115 reloc_howto_type *howto = reloc_entry->howto;
116 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
122 char x = bfd_get_8 (abfd, addr);
124 bfd_put_8 (abfd, x, addr);
130 short x = bfd_get_16 (abfd, addr);
132 bfd_put_16 (abfd, (bfd_vma) x, addr);
138 long x = bfd_get_32 (abfd, addr);
140 bfd_put_32 (abfd, (bfd_vma) x, addr);
149 /* Now let bfd_perform_relocation finish everything up. */
150 return bfd_reloc_continue;
153 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
154 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
156 #ifndef TARGET_UNDERSCORE
157 #define TARGET_UNDERSCORE '_'
161 #define PCRELOFFSET TRUE
164 /* These most certainly belong somewhere else. Just had to get rid of
165 the manifest constants in the code. */
178 #define ARM_THUMB9 12
179 #define ARM_THUMB12 13
180 #define ARM_THUMB23 14
193 #define ARM_THUMB12 4
194 #define ARM_SECTION 14
195 #define ARM_SECREL 15
198 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
199 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
200 static bfd_reloc_status_type aoutarm_fix_pcrel_26
201 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
202 static bfd_reloc_status_type coff_thumb_pcrel_12
203 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
205 static bfd_reloc_status_type coff_thumb_pcrel_9
206 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
207 static bfd_reloc_status_type coff_thumb_pcrel_23
208 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
211 static reloc_howto_type aoutarm_std_reloc_howto[] =
220 complain_overflow_dont,
221 aoutarm_fix_pcrel_26_done,
233 complain_overflow_bitfield,
246 complain_overflow_bitfield,
259 complain_overflow_signed,
260 aoutarm_fix_pcrel_26 ,
272 complain_overflow_signed,
273 coff_thumb_pcrel_12 ,
294 complain_overflow_bitfield,
307 complain_overflow_bitfield,
314 #else /* not ARM_WINCE */
321 complain_overflow_bitfield,
334 complain_overflow_bitfield,
347 complain_overflow_bitfield,
360 complain_overflow_signed,
361 aoutarm_fix_pcrel_26 ,
373 complain_overflow_signed,
386 complain_overflow_signed,
399 complain_overflow_signed,
412 complain_overflow_dont,
413 aoutarm_fix_pcrel_26_done,
427 complain_overflow_bitfield,
440 complain_overflow_bitfield,
453 complain_overflow_bitfield,
466 complain_overflow_signed,
479 complain_overflow_signed,
480 coff_thumb_pcrel_12 ,
492 complain_overflow_signed,
493 coff_thumb_pcrel_23 ,
499 #endif /* not ARM_WINCE */
502 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
505 /* Return TRUE if this relocation should
506 appear in the output .reloc section. */
509 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED,
510 reloc_howto_type * howto)
512 return !howto->pc_relative && howto->type != ARM_RVA32;
516 #define RTYPE2HOWTO(cache_ptr, dst) \
517 (cache_ptr)->howto = \
518 (dst)->r_type < NUM_RELOCS \
519 ? aoutarm_std_reloc_howto + (dst)->r_type \
522 #define coff_rtype_to_howto coff_arm_rtype_to_howto
524 static reloc_howto_type *
525 coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
527 struct internal_reloc *rel,
528 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
529 struct internal_syment *sym ATTRIBUTE_UNUSED,
532 reloc_howto_type * howto;
534 if (rel->r_type >= NUM_RELOCS)
537 howto = aoutarm_std_reloc_howto + rel->r_type;
539 if (rel->r_type == ARM_RVA32)
540 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
545 /* Used by the assembler. */
547 static bfd_reloc_status_type
548 aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
549 arelent *reloc_entry ATTRIBUTE_UNUSED,
550 asymbol *symbol ATTRIBUTE_UNUSED,
551 void * data ATTRIBUTE_UNUSED,
552 asection *input_section ATTRIBUTE_UNUSED,
553 bfd *output_bfd ATTRIBUTE_UNUSED,
554 char **error_message ATTRIBUTE_UNUSED)
556 /* This is dead simple at present. */
560 /* Used by the assembler. */
562 static bfd_reloc_status_type
563 aoutarm_fix_pcrel_26 (bfd *abfd,
564 arelent *reloc_entry,
567 asection *input_section,
569 char **error_message ATTRIBUTE_UNUSED)
572 bfd_size_type addr = reloc_entry->address;
573 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
574 bfd_reloc_status_type flag = bfd_reloc_ok;
576 /* If this is an undefined symbol, return error. */
577 if (symbol->section == &bfd_und_section
578 && (symbol->flags & BSF_WEAK) == 0)
579 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
581 /* If the sections are different, and we are doing a partial relocation,
582 just ignore it for now. */
583 if (symbol->section->name != input_section->name
584 && output_bfd != (bfd *)NULL)
585 return bfd_reloc_continue;
587 relocation = (target & 0x00ffffff) << 2;
588 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
589 relocation += symbol->value;
590 relocation += symbol->section->output_section->vma;
591 relocation += symbol->section->output_offset;
592 relocation += reloc_entry->addend;
593 relocation -= input_section->output_section->vma;
594 relocation -= input_section->output_offset;
598 return bfd_reloc_overflow;
600 /* Check for overflow. */
601 if (relocation & 0x02000000)
603 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
604 flag = bfd_reloc_overflow;
606 else if (relocation & ~(bfd_vma) 0x03ffffff)
607 flag = bfd_reloc_overflow;
609 target &= ~0x00ffffff;
610 target |= (relocation >> 2) & 0x00ffffff;
611 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
613 /* Now the ARM magic... Change the reloc type so that it is marked as done.
614 Strictly this is only necessary if we are doing a partial relocation. */
615 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
620 static bfd_reloc_status_type
621 coff_thumb_pcrel_common (bfd *abfd,
622 arelent *reloc_entry,
625 asection *input_section,
627 char **error_message ATTRIBUTE_UNUSED,
628 thumb_pcrel_branchtype btype)
630 bfd_vma relocation = 0;
631 bfd_size_type addr = reloc_entry->address;
632 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
633 bfd_reloc_status_type flag = bfd_reloc_ok;
638 /* NOTE: This routine is currently used by GAS, but not by the link
645 signbit = 0x00000100;
651 signbit = 0x00000800;
657 signbit = 0x00400000;
664 /* If this is an undefined symbol, return error. */
665 if (symbol->section == &bfd_und_section
666 && (symbol->flags & BSF_WEAK) == 0)
667 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
669 /* If the sections are different, and we are doing a partial relocation,
670 just ignore it for now. */
671 if (symbol->section->name != input_section->name
672 && output_bfd != (bfd *)NULL)
673 return bfd_reloc_continue;
679 relocation = ((target & dstmsk) << 1);
683 if (bfd_big_endian (abfd))
684 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
686 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
693 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
694 relocation += symbol->value;
695 relocation += symbol->section->output_section->vma;
696 relocation += symbol->section->output_offset;
697 relocation += reloc_entry->addend;
698 relocation -= input_section->output_section->vma;
699 relocation -= input_section->output_offset;
703 return bfd_reloc_overflow;
705 /* Check for overflow. */
706 if (relocation & signbit)
708 if ((relocation & ~offmsk) != ~offmsk)
709 flag = bfd_reloc_overflow;
711 else if (relocation & ~offmsk)
712 flag = bfd_reloc_overflow;
719 target |= (relocation >> 1);
723 if (bfd_big_endian (abfd))
724 target |= (((relocation & 0xfff) >> 1)
725 | ((relocation << 4) & 0x07ff0000));
727 target |= (((relocation & 0xffe) << 15)
728 | ((relocation >> 12) & 0x7ff));
735 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
737 /* Now the ARM magic... Change the reloc type so that it is marked as done.
738 Strictly this is only necessary if we are doing a partial relocation. */
739 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
741 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
746 static bfd_reloc_status_type
747 coff_thumb_pcrel_23 (bfd *abfd,
748 arelent *reloc_entry,
751 asection *input_section,
753 char **error_message)
755 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
756 input_section, output_bfd, error_message,
760 static bfd_reloc_status_type
761 coff_thumb_pcrel_9 (bfd *abfd,
762 arelent *reloc_entry,
765 asection *input_section,
767 char **error_message)
769 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
770 input_section, output_bfd, error_message,
773 #endif /* not ARM_WINCE */
775 static bfd_reloc_status_type
776 coff_thumb_pcrel_12 (bfd *abfd,
777 arelent *reloc_entry,
780 asection *input_section,
782 char **error_message)
784 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
785 input_section, output_bfd, error_message,
789 static const struct reloc_howto_struct *
790 coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code)
792 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
794 if (code == BFD_RELOC_CTOR)
795 switch (bfd_get_arch_info (abfd)->bits_per_address)
807 ASTD (BFD_RELOC_32, ARM_32);
808 ASTD (BFD_RELOC_RVA, ARM_RVA32);
809 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
810 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
812 ASTD (BFD_RELOC_8, ARM_8);
813 ASTD (BFD_RELOC_16, ARM_16);
814 ASTD (BFD_RELOC_32, ARM_32);
815 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
816 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
817 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
818 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
819 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
820 ASTD (BFD_RELOC_RVA, ARM_RVA32);
821 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
822 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
823 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
824 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
826 default: return NULL;
830 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
831 #define COFF_PAGE_SIZE 0x1000
833 /* Turn a howto into a reloc nunmber. */
834 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
835 #define BADMAG(x) ARMBADMAG(x)
836 #define ARM 1 /* Customize coffcode.h. */
839 /* Make sure that the 'r_offset' field is copied properly
840 so that identical binaries will compare the same. */
841 #define SWAP_IN_RELOC_OFFSET H_GET_32
842 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
845 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
846 This allows us to store global data here without actually creating any
847 global variables, which is a no-no in the BFD world. */
848 struct coff_arm_link_hash_table
850 /* The original coff_link_hash_table structure. MUST be first field. */
851 struct coff_link_hash_table root;
853 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
854 bfd_size_type thumb_glue_size;
856 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
857 bfd_size_type arm_glue_size;
859 /* An arbitrary input BFD chosen to hold the glue sections. */
860 bfd * bfd_of_glue_owner;
862 /* Support interworking with old, non-interworking aware ARM code. */
863 int support_old_code;
866 /* Get the ARM coff linker hash table from a link_info structure. */
867 #define coff_arm_hash_table(info) \
868 ((struct coff_arm_link_hash_table *) ((info)->hash))
870 /* Create an ARM coff linker hash table. */
872 static struct bfd_link_hash_table *
873 coff_arm_link_hash_table_create (bfd * abfd)
875 struct coff_arm_link_hash_table * ret;
876 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
878 ret = bfd_malloc (amt);
882 if (!_bfd_coff_link_hash_table_init (&ret->root,
884 _bfd_coff_link_hash_newfunc,
885 sizeof (struct coff_link_hash_entry)))
891 ret->thumb_glue_size = 0;
892 ret->arm_glue_size = 0;
893 ret->bfd_of_glue_owner = NULL;
895 return & ret->root.root;
899 arm_emit_base_file_entry (struct bfd_link_info *info,
901 asection *input_section,
902 bfd_vma reloc_offset)
904 bfd_vma addr = reloc_offset
906 + input_section->output_offset
907 + input_section->output_section->vma;
909 if (coff_data (output_bfd)->pe)
910 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
911 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
916 /* The thumb form of a long branch is a bit finicky, because the offset
917 encoding is split over two fields, each in it's own instruction. They
918 can occur in any order. So given a thumb form of long branch, and an
919 offset, insert the offset into the thumb branch and return finished
922 It takes two thumb instructions to encode the target address. Each has
923 11 bits to invest. The upper 11 bits are stored in one (identified by
924 H-0.. see below), the lower 11 bits are stored in the other (identified
927 Combine together and shifted left by 1 (it's a half word address) and
931 H-0, upper address-0 = 000
933 H-1, lower address-0 = 800
935 They can be ordered either way, but the arm tools I've seen always put
936 the lower one first. It probably doesn't matter. krk@cygnus.com
938 XXX: Actually the order does matter. The second instruction (H-1)
939 moves the computed address into the PC, so it must be the second one
940 in the sequence. The problem, however is that whilst little endian code
941 stores the instructions in HI then LOW order, big endian code does the
942 reverse. nickc@cygnus.com. */
944 #define LOW_HI_ORDER 0xF800F000
945 #define HI_LOW_ORDER 0xF000F800
948 insert_thumb_branch (insn32 br_insn, int rel_off)
950 unsigned int low_bits;
951 unsigned int high_bits;
953 BFD_ASSERT ((rel_off & 1) != 1);
955 rel_off >>= 1; /* Half word aligned address. */
956 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
957 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
959 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
960 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
961 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
962 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
964 /* FIXME: the BFD library should never abort except for internal errors
965 - it should return an error status. */
966 abort (); /* Error - not a valid branch instruction form. */
972 static struct coff_link_hash_entry *
973 find_thumb_glue (struct bfd_link_info *info,
978 struct coff_link_hash_entry *myh;
979 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
981 tmp_name = bfd_malloc (amt);
983 BFD_ASSERT (tmp_name);
985 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
987 myh = coff_link_hash_lookup
988 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
991 /* xgettext:c-format */
992 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
993 input_bfd, tmp_name, name);
999 #endif /* not ARM_WINCE */
1001 static struct coff_link_hash_entry *
1002 find_arm_glue (struct bfd_link_info *info,
1007 struct coff_link_hash_entry * myh;
1008 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1010 tmp_name = bfd_malloc (amt);
1012 BFD_ASSERT (tmp_name);
1014 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1016 myh = coff_link_hash_lookup
1017 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1020 /* xgettext:c-format */
1021 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1022 input_bfd, tmp_name, name);
1034 ldr r12, __func_addr
1037 .word func @ behave as if you saw a ARM_32 reloc
1040 #define ARM2THUMB_GLUE_SIZE 12
1041 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1042 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1043 static const insn32 a2t3_func_addr_insn = 0x00000001;
1046 Thumb->ARM: Thumb->(non-interworking aware) ARM
1050 __func_from_thumb: __func_from_thumb:
1052 nop ldr r6, __func_addr
1054 __func_change_to_arm: bx r6
1056 __func_back_to_thumb:
1063 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1065 static const insn16 t2a1_bx_pc_insn = 0x4778;
1066 static const insn16 t2a2_noop_insn = 0x46c0;
1067 static const insn32 t2a3_b_insn = 0xea000000;
1069 static const insn16 t2a1_push_insn = 0xb540;
1070 static const insn16 t2a2_ldr_insn = 0x4e03;
1071 static const insn16 t2a3_mov_insn = 0x46fe;
1072 static const insn16 t2a4_bx_insn = 0x4730;
1073 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1074 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1078 We should really create new local (static) symbols in destination
1079 object for each stub we create. We should also create local
1080 (static) symbols within the stubs when switching between ARM and
1081 Thumb code. This will ensure that the debugger and disassembler
1082 can present a better view of stubs.
1084 We can treat stubs like literal sections, and for the THUMB9 ones
1085 (short addressing range) we should be able to insert the stubs
1086 between sections. i.e. the simplest approach (since relocations
1087 are done on a section basis) is to dump the stubs at the end of
1088 processing a section. That way we can always try and minimise the
1089 offset to and from a stub. However, this does not map well onto
1090 the way that the linker/BFD does its work: mapping all input
1091 sections to output sections via the linker script before doing
1094 Unfortunately it may be easier to just to disallow short range
1095 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1096 only branch-and-link (BL) calls. This will simplify the processing
1097 since we can then put all of the stubs into their own section.
1100 On a different subject, rather than complaining when a
1101 branch cannot fit in the number of bits available for the
1102 instruction we should generate a trampoline stub (needed to
1103 address the complete 32bit address space). */
1105 /* The standard COFF backend linker does not cope with the special
1106 Thumb BRANCH23 relocation. The alternative would be to split the
1107 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1108 bit simpler simply providing our own relocation driver. */
1110 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1111 This code is a very slightly modified copy of
1112 _bfd_coff_generic_relocate_section. It would be a much more
1113 maintainable solution to have a MACRO that could be expanded within
1114 _bfd_coff_generic_relocate_section that would only be provided for
1115 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1116 is different from the original. */
1119 coff_arm_relocate_section (bfd *output_bfd,
1120 struct bfd_link_info *info,
1122 asection *input_section,
1124 struct internal_reloc *relocs,
1125 struct internal_syment *syms,
1126 asection **sections)
1128 struct internal_reloc * rel;
1129 struct internal_reloc * relend;
1131 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1135 relend = rel + input_section->reloc_count;
1137 for (; rel < relend; rel++)
1141 struct coff_link_hash_entry * h;
1142 struct internal_syment * sym;
1145 reloc_howto_type * howto;
1146 bfd_reloc_status_type rstat;
1149 symndx = rel->r_symndx;
1158 h = obj_coff_sym_hashes (input_bfd)[symndx];
1159 sym = syms + symndx;
1162 /* COFF treats common symbols in one of two ways. Either the
1163 size of the symbol is included in the section contents, or it
1164 is not. We assume that the size is not included, and force
1165 the rtype_to_howto function to adjust the addend as needed. */
1167 if (sym != NULL && sym->n_scnum != 0)
1168 addend = - sym->n_value;
1172 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1177 /* The relocation_section function will skip pcrel_offset relocs
1178 when doing a relocatable link. However, we want to convert
1179 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1180 this case without pcrel_offset set, and adjust the addend to
1181 compensate. 'partial_inplace' is also set, since we want 'done'
1182 relocations to be reflected in section's data. */
1183 if (rel->r_type == ARM_26
1185 && info->relocatable
1186 && (h->root.type == bfd_link_hash_defined
1187 || h->root.type == bfd_link_hash_defweak)
1188 && (h->root.u.def.section->output_section
1189 == input_section->output_section))
1191 static reloc_howto_type fake_arm26_reloc =
1198 complain_overflow_signed,
1199 aoutarm_fix_pcrel_26 ,
1206 addend -= rel->r_vaddr - input_section->vma;
1208 /* FIXME: I don't know why, but the hack is necessary for correct
1209 generation of bl's instruction offset. */
1212 howto = &fake_arm26_reloc;
1216 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1217 the next opcode's pc, so is off by one. */
1220 /* If we are doing a relocatable link, then we can just ignore
1221 a PC relative reloc that is pcrel_offset. It will already
1222 have the correct value. If this is not a relocatable link,
1223 then we should ignore the symbol value. */
1224 if (howto->pc_relative && howto->pcrel_offset)
1226 if (info->relocatable)
1228 /* FIXME - it is not clear which targets need this next test
1229 and which do not. It is known that it is needed for the
1230 VxWorks and EPOC-PE targets, but it is also known that it
1231 was suppressed for other ARM targets. This ought to be
1232 sorted out one day. */
1233 #ifdef ARM_COFF_BUGFIX
1234 /* We must not ignore the symbol value. If the symbol is
1235 within the same section, the relocation should have already
1236 been fixed, but if it is not, we'll be handed a reloc into
1237 the beginning of the symbol's section, so we must not cancel
1238 out the symbol's value, otherwise we'll be adding it in
1240 if (sym != NULL && sym->n_scnum != 0)
1241 addend += sym->n_value;
1253 sec = bfd_abs_section_ptr;
1258 sec = sections[symndx];
1259 val = (sec->output_section->vma
1260 + sec->output_offset
1267 /* We don't output the stubs if we are generating a
1268 relocatable output file, since we may as well leave the
1269 stub generation to the final linker pass. If we fail to
1270 verify that the name is defined, we'll try to build stubs
1271 for an undefined name... */
1272 if (! info->relocatable
1273 && ( h->root.type == bfd_link_hash_defined
1274 || h->root.type == bfd_link_hash_defweak))
1276 asection * h_sec = h->root.u.def.section;
1277 const char * name = h->root.root.string;
1279 /* h locates the symbol referenced in the reloc. */
1280 h_val = (h->root.u.def.value
1281 + h_sec->output_section->vma
1282 + h_sec->output_offset);
1284 if (howto->type == ARM_26)
1286 if ( h->class == C_THUMBSTATFUNC
1287 || h->class == C_THUMBEXTFUNC)
1289 /* Arm code calling a Thumb function. */
1290 unsigned long int tmp;
1293 long int ret_offset;
1294 struct coff_link_hash_entry * myh;
1295 struct coff_arm_link_hash_table * globals;
1297 myh = find_arm_glue (info, name, input_bfd);
1301 globals = coff_arm_hash_table (info);
1303 BFD_ASSERT (globals != NULL);
1304 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1306 my_offset = myh->root.u.def.value;
1308 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1309 ARM2THUMB_GLUE_SECTION_NAME);
1310 BFD_ASSERT (s != NULL);
1311 BFD_ASSERT (s->contents != NULL);
1312 BFD_ASSERT (s->output_section != NULL);
1314 if ((my_offset & 0x01) == 0x01)
1316 if (h_sec->owner != NULL
1317 && INTERWORK_SET (h_sec->owner)
1318 && ! INTERWORK_FLAG (h_sec->owner))
1320 /* xgettext:c-format */
1321 (_("%B(%s): warning: interworking not enabled.\n"
1322 " first occurrence: %B: arm call to thumb"),
1323 h_sec->owner, input_bfd, name);
1326 myh->root.u.def.value = my_offset;
1328 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1329 s->contents + my_offset);
1331 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1332 s->contents + my_offset + 4);
1334 /* It's a thumb address. Add the low order bit. */
1335 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1336 s->contents + my_offset + 8);
1338 if (info->base_file)
1339 arm_emit_base_file_entry (info, output_bfd, s,
1344 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1346 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1347 - input_section->vma);
1349 tmp = tmp & 0xFF000000;
1351 /* Somehow these are both 4 too far, so subtract 8. */
1355 + s->output_section->vma
1356 - (input_section->output_offset
1357 + input_section->output_section->vma
1361 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1363 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1364 contents + rel->r_vaddr - input_section->vma);
1370 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1371 else if (howto->type == ARM_THUMB23)
1373 if ( h->class == C_EXT
1374 || h->class == C_STAT
1375 || h->class == C_LABEL)
1377 /* Thumb code calling an ARM function. */
1380 unsigned long int tmp;
1381 long int ret_offset;
1382 struct coff_link_hash_entry * myh;
1383 struct coff_arm_link_hash_table * globals;
1385 myh = find_thumb_glue (info, name, input_bfd);
1389 globals = coff_arm_hash_table (info);
1391 BFD_ASSERT (globals != NULL);
1392 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1394 my_offset = myh->root.u.def.value;
1396 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1397 THUMB2ARM_GLUE_SECTION_NAME);
1399 BFD_ASSERT (s != NULL);
1400 BFD_ASSERT (s->contents != NULL);
1401 BFD_ASSERT (s->output_section != NULL);
1403 if ((my_offset & 0x01) == 0x01)
1405 if (h_sec->owner != NULL
1406 && INTERWORK_SET (h_sec->owner)
1407 && ! INTERWORK_FLAG (h_sec->owner)
1408 && ! globals->support_old_code)
1410 /* xgettext:c-format */
1411 (_("%B(%s): warning: interworking not enabled.\n"
1412 " first occurrence: %B: thumb call to arm\n"
1413 " consider relinking with --support-old-code enabled"),
1414 h_sec->owner, input_bfd, name);
1417 myh->root.u.def.value = my_offset;
1419 if (globals->support_old_code)
1421 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1422 s->contents + my_offset);
1424 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1425 s->contents + my_offset + 2);
1427 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1428 s->contents + my_offset + 4);
1430 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1431 s->contents + my_offset + 6);
1433 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1434 s->contents + my_offset + 8);
1436 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1437 s->contents + my_offset + 12);
1439 /* Store the address of the function in the last word of the stub. */
1440 bfd_put_32 (output_bfd, h_val,
1441 s->contents + my_offset + 16);
1443 if (info->base_file)
1444 arm_emit_base_file_entry (info, output_bfd, s,
1449 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1450 s->contents + my_offset);
1452 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1453 s->contents + my_offset + 2);
1456 /* Address of destination of the stub. */
1457 ((bfd_signed_vma) h_val)
1459 /* Offset from the start of the current section to the start of the stubs. */
1461 /* Offset of the start of this stub from the start of the stubs. */
1463 /* Address of the start of the current section. */
1464 + s->output_section->vma)
1465 /* The branch instruction is 4 bytes into the stub. */
1467 /* ARM branches work from the pc of the instruction + 8. */
1470 bfd_put_32 (output_bfd,
1471 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1472 s->contents + my_offset + 4);
1477 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1479 /* Now go back and fix up the original BL insn to point
1484 - (input_section->output_offset
1488 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1489 - input_section->vma);
1491 bfd_put_32 (output_bfd,
1492 (bfd_vma) insert_thumb_branch (tmp,
1494 contents + rel->r_vaddr - input_section->vma);
1502 /* If the relocation type and destination symbol does not
1503 fall into one of the above categories, then we can just
1504 perform a direct link. */
1507 rstat = bfd_reloc_ok;
1509 if ( h->root.type == bfd_link_hash_defined
1510 || h->root.type == bfd_link_hash_defweak)
1514 sec = h->root.u.def.section;
1515 val = (h->root.u.def.value
1516 + sec->output_section->vma
1517 + sec->output_offset);
1520 else if (! info->relocatable)
1522 if (! ((*info->callbacks->undefined_symbol)
1523 (info, h->root.root.string, input_bfd, input_section,
1524 rel->r_vaddr - input_section->vma, TRUE)))
1529 if (info->base_file)
1531 /* Emit a reloc if the backend thinks it needs it. */
1532 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1533 arm_emit_base_file_entry (info, output_bfd, input_section,
1538 rstat = bfd_reloc_ok;
1540 /* Only perform this fix during the final link, not a relocatable link. */
1541 else if (! info->relocatable
1542 && howto->type == ARM_THUMB23)
1544 /* This is pretty much a copy of what the default
1545 _bfd_final_link_relocate and _bfd_relocate_contents
1546 routines do to perform a relocation, with special
1547 processing for the split addressing of the Thumb BL
1548 instruction. Again, it would probably be simpler adding a
1549 ThumbBRANCH23 specific macro expansion into the default
1552 bfd_vma address = rel->r_vaddr - input_section->vma;
1554 if (address > high_address)
1555 rstat = bfd_reloc_outofrange;
1558 bfd_vma relocation = val + addend;
1559 int size = bfd_get_reloc_size (howto);
1560 bfd_boolean overflow = FALSE;
1561 bfd_byte *location = contents + address;
1562 bfd_vma x = bfd_get_32 (input_bfd, location);
1563 bfd_vma src_mask = 0x007FFFFE;
1564 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1565 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1567 bfd_signed_vma signed_check;
1569 bfd_signed_vma signed_add;
1571 BFD_ASSERT (size == 4);
1573 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1574 relocation -= (input_section->output_section->vma
1575 + input_section->output_offset);
1577 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1578 relocation -= address;
1580 /* No need to negate the relocation with BRANCH23. */
1581 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1582 /* howto->rightshift == 1 */
1584 /* Drop unwanted bits from the value we are relocating to. */
1585 check = relocation >> howto->rightshift;
1587 /* If this is a signed value, the rightshift just dropped
1588 leading 1 bits (assuming twos complement). */
1589 if ((bfd_signed_vma) relocation >= 0)
1590 signed_check = check;
1592 signed_check = (check
1594 & ~((bfd_vma) - 1 >> howto->rightshift)));
1596 /* Get the value from the object file. */
1597 if (bfd_big_endian (input_bfd))
1598 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1600 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1602 /* Get the value from the object file with an appropriate sign.
1603 The expression involving howto->src_mask isolates the upper
1604 bit of src_mask. If that bit is set in the value we are
1605 adding, it is negative, and we subtract out that number times
1606 two. If src_mask includes the highest possible bit, then we
1607 can not get the upper bit, but that does not matter since
1608 signed_add needs no adjustment to become negative in that
1612 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1613 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1615 /* howto->bitpos == 0 */
1616 /* Add the value from the object file, shifted so that it is a
1618 signed_check += signed_add;
1619 relocation += signed_add;
1621 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1623 /* Assumes two's complement. */
1624 if ( signed_check > reloc_signed_max
1625 || signed_check < reloc_signed_min)
1628 /* Put the relocation into the correct bits.
1629 For a BLX instruction, make sure that the relocation is rounded up
1630 to a word boundary. This follows the semantics of the instruction
1631 which specifies that bit 1 of the target address will come from bit
1632 1 of the base address. */
1633 if (bfd_big_endian (input_bfd))
1635 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1637 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1641 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1643 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1646 /* Add the relocation to the correct bits of X. */
1647 x = ((x & ~howto->dst_mask) | relocation);
1649 /* Put the relocated value back in the object file. */
1650 bfd_put_32 (input_bfd, x, location);
1652 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1657 if (info->relocatable && ! howto->partial_inplace)
1658 rstat = bfd_reloc_ok;
1660 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1662 rel->r_vaddr - input_section->vma,
1664 /* Only perform this fix during the final link, not a relocatable link. */
1665 if (! info->relocatable
1666 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1668 /* Determine if we need to set the bottom bit of a relocated address
1669 because the address is the address of a Thumb code symbol. */
1670 int patchit = FALSE;
1673 && ( h->class == C_THUMBSTATFUNC
1674 || h->class == C_THUMBEXTFUNC))
1678 else if (sym != NULL
1679 && sym->n_scnum > N_UNDEF)
1681 /* No hash entry - use the symbol instead. */
1682 if ( sym->n_sclass == C_THUMBSTATFUNC
1683 || sym->n_sclass == C_THUMBEXTFUNC)
1689 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1690 bfd_vma x = bfd_get_32 (input_bfd, location);
1692 bfd_put_32 (input_bfd, x | 1, location);
1702 case bfd_reloc_outofrange:
1703 (*_bfd_error_handler)
1704 (_("%B: bad reloc address 0x%lx in section `%A'"),
1705 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1707 case bfd_reloc_overflow:
1710 char buf[SYMNMLEN + 1];
1718 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1723 if (! ((*info->callbacks->reloc_overflow)
1724 (info, (h ? &h->root : NULL), name, howto->name,
1725 (bfd_vma) 0, input_bfd, input_section,
1726 rel->r_vaddr - input_section->vma)))
1735 #ifndef COFF_IMAGE_WITH_PE
1738 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1742 struct coff_arm_link_hash_table * globals;
1744 globals = coff_arm_hash_table (info);
1746 BFD_ASSERT (globals != NULL);
1748 if (globals->arm_glue_size != 0)
1750 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1752 s = bfd_get_section_by_name
1753 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1755 BFD_ASSERT (s != NULL);
1757 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1759 s->size = globals->arm_glue_size;
1763 if (globals->thumb_glue_size != 0)
1765 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1767 s = bfd_get_section_by_name
1768 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1770 BFD_ASSERT (s != NULL);
1772 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1774 s->size = globals->thumb_glue_size;
1782 record_arm_to_thumb_glue (struct bfd_link_info * info,
1783 struct coff_link_hash_entry * h)
1785 const char * name = h->root.root.string;
1786 register asection * s;
1788 struct coff_link_hash_entry * myh;
1789 struct bfd_link_hash_entry * bh;
1790 struct coff_arm_link_hash_table * globals;
1794 globals = coff_arm_hash_table (info);
1796 BFD_ASSERT (globals != NULL);
1797 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1799 s = bfd_get_section_by_name
1800 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1802 BFD_ASSERT (s != NULL);
1804 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1805 tmp_name = bfd_malloc (amt);
1807 BFD_ASSERT (tmp_name);
1809 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1811 myh = coff_link_hash_lookup
1812 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1817 /* We've already seen this guy. */
1821 /* The only trick here is using globals->arm_glue_size as the value. Even
1822 though the section isn't allocated yet, this is where we will be putting
1825 val = globals->arm_glue_size + 1;
1826 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1827 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1831 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1838 record_thumb_to_arm_glue (struct bfd_link_info * info,
1839 struct coff_link_hash_entry * h)
1841 const char * name = h->root.root.string;
1844 struct coff_link_hash_entry * myh;
1845 struct bfd_link_hash_entry * bh;
1846 struct coff_arm_link_hash_table * globals;
1850 globals = coff_arm_hash_table (info);
1852 BFD_ASSERT (globals != NULL);
1853 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1855 s = bfd_get_section_by_name
1856 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1858 BFD_ASSERT (s != NULL);
1860 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1861 tmp_name = bfd_malloc (amt);
1863 BFD_ASSERT (tmp_name);
1865 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1867 myh = coff_link_hash_lookup
1868 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1873 /* We've already seen this guy. */
1878 val = globals->thumb_glue_size + 1;
1879 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1880 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1882 /* If we mark it 'thumb', the disassembler will do a better job. */
1883 myh = (struct coff_link_hash_entry *) bh;
1884 myh->class = C_THUMBEXTFUNC;
1888 /* Allocate another symbol to mark where we switch to arm mode. */
1890 #define CHANGE_TO_ARM "__%s_change_to_arm"
1891 #define BACK_FROM_ARM "__%s_back_from_arm"
1893 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1894 tmp_name = bfd_malloc (amt);
1896 BFD_ASSERT (tmp_name);
1898 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1901 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1902 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1903 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1907 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1911 #endif /* not ARM_WINCE */
1913 /* Select a BFD to be used to hold the sections used by the glue code.
1914 This function is called from the linker scripts in ld/emultempl/
1918 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1919 struct bfd_link_info * info)
1921 struct coff_arm_link_hash_table * globals;
1925 /* If we are only performing a partial link do not bother
1926 getting a bfd to hold the glue. */
1927 if (info->relocatable)
1930 globals = coff_arm_hash_table (info);
1932 BFD_ASSERT (globals != NULL);
1934 if (globals->bfd_of_glue_owner != NULL)
1937 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1941 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1943 sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1946 || ! bfd_set_section_flags (abfd, sec, flags)
1947 || ! bfd_set_section_alignment (abfd, sec, 2))
1951 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1955 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY;
1957 sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1960 || ! bfd_set_section_flags (abfd, sec, flags)
1961 || ! bfd_set_section_alignment (abfd, sec, 2))
1965 /* Save the bfd for later use. */
1966 globals->bfd_of_glue_owner = abfd;
1972 bfd_arm_process_before_allocation (bfd * abfd,
1973 struct bfd_link_info * info,
1974 int support_old_code)
1977 struct coff_arm_link_hash_table * globals;
1979 /* If we are only performing a partial link do not bother
1980 to construct any glue. */
1981 if (info->relocatable)
1984 /* Here we have a bfd that is to be included on the link. We have a hook
1985 to do reloc rummaging, before section sizes are nailed down. */
1986 _bfd_coff_get_external_symbols (abfd);
1988 globals = coff_arm_hash_table (info);
1990 BFD_ASSERT (globals != NULL);
1991 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1993 globals->support_old_code = support_old_code;
1995 /* Rummage around all the relocs and map the glue vectors. */
1996 sec = abfd->sections;
2001 for (; sec != NULL; sec = sec->next)
2003 struct internal_reloc * i;
2004 struct internal_reloc * rel;
2006 if (sec->reloc_count == 0)
2009 /* Load the relocs. */
2010 /* FIXME: there may be a storage leak here. */
2011 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2013 BFD_ASSERT (i != 0);
2015 for (rel = i; rel < i + sec->reloc_count; ++rel)
2017 unsigned short r_type = rel->r_type;
2019 struct coff_link_hash_entry * h;
2021 symndx = rel->r_symndx;
2023 /* If the relocation is not against a symbol it cannot concern us. */
2027 /* If the index is outside of the range of our table, something has gone wrong. */
2028 if (symndx >= obj_conv_table_size (abfd))
2030 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2035 h = obj_coff_sym_hashes (abfd)[symndx];
2037 /* If the relocation is against a static symbol it must be within
2038 the current section and so cannot be a cross ARM/Thumb relocation. */
2045 /* This one is a call from arm code. We need to look up
2046 the target of the call. If it is a thumb target, we
2049 if (h->class == C_THUMBEXTFUNC)
2050 record_arm_to_thumb_glue (info, h);
2055 /* This one is a call from thumb code. We used to look
2056 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2057 up the target of the call. If it is an arm target, we
2058 insert glue. If the symbol does not exist it will be
2059 given a class of C_EXT and so we will generate a stub
2060 for it. This is not really a problem, since the link
2061 is doomed anyway. */
2068 record_thumb_to_arm_glue (info, h);
2085 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2087 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2088 #define coff_relocate_section coff_arm_relocate_section
2089 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2090 #define coff_adjust_symndx coff_arm_adjust_symndx
2091 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2092 #define coff_final_link_postscript coff_arm_final_link_postscript
2093 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2094 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2095 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2096 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2097 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2099 /* When doing a relocatable link, we want to convert ARM_26 relocs
2100 into ARM_26D relocs. */
2103 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2104 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2107 struct internal_reloc *irel,
2108 bfd_boolean *adjustedp)
2110 if (irel->r_type == ARM_26)
2112 struct coff_link_hash_entry *h;
2114 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2116 && (h->root.type == bfd_link_hash_defined
2117 || h->root.type == bfd_link_hash_defweak)
2118 && h->root.u.def.section->output_section == sec->output_section)
2119 irel->r_type = ARM_26D;
2125 /* Called when merging the private data areas of two BFDs.
2126 This is important as it allows us to detect if we are
2127 attempting to merge binaries compiled for different ARM
2128 targets, eg different CPUs or different APCS's. */
2131 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2133 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2138 /* If the two formats are different we cannot merge anything.
2139 This is not an error, since it is permissable to change the
2140 input and output formats. */
2141 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2142 || obfd->xvec->flavour != bfd_target_coff_flavour)
2145 /* Determine what should happen if the input ARM architecture
2146 does not match the output ARM architecture. */
2147 if (! bfd_arm_merge_machines (ibfd, obfd))
2150 /* Verify that the APCS is the same for the two BFDs. */
2151 if (APCS_SET (ibfd))
2153 if (APCS_SET (obfd))
2155 /* If the src and dest have different APCS flag bits set, fail. */
2156 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2159 /* xgettext: c-format */
2160 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2162 APCS_26_FLAG (ibfd) ? 26 : 32,
2163 APCS_26_FLAG (obfd) ? 26 : 32
2166 bfd_set_error (bfd_error_wrong_format);
2170 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2174 if (APCS_FLOAT_FLAG (ibfd))
2175 /* xgettext: c-format */
2176 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2178 /* xgettext: c-format */
2179 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2181 _bfd_error_handler (msg, ibfd, obfd);
2183 bfd_set_error (bfd_error_wrong_format);
2187 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2191 if (PIC_FLAG (ibfd))
2192 /* xgettext: c-format */
2193 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2195 /* xgettext: c-format */
2196 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2197 _bfd_error_handler (msg, ibfd, obfd);
2199 bfd_set_error (bfd_error_wrong_format);
2205 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2207 /* Set up the arch and fields as well as these are probably wrong. */
2208 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2212 /* Check the interworking support. */
2213 if (INTERWORK_SET (ibfd))
2215 if (INTERWORK_SET (obfd))
2217 /* If the src and dest differ in their interworking issue a warning. */
2218 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2222 if (INTERWORK_FLAG (ibfd))
2223 /* xgettext: c-format */
2224 msg = _("Warning: %B supports interworking, whereas %B does not");
2226 /* xgettext: c-format */
2227 msg = _("Warning: %B does not support interworking, whereas %B does");
2229 _bfd_error_handler (msg, ibfd, obfd);
2234 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2241 /* Display the flags field. */
2244 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2246 FILE * file = (FILE *) ptr;
2248 BFD_ASSERT (abfd != NULL && ptr != NULL);
2250 /* xgettext:c-format */
2251 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2253 if (APCS_SET (abfd))
2255 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2256 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2258 if (APCS_FLOAT_FLAG (abfd))
2259 fprintf (file, _(" [floats passed in float registers]"));
2261 fprintf (file, _(" [floats passed in integer registers]"));
2263 if (PIC_FLAG (abfd))
2264 fprintf (file, _(" [position independent]"));
2266 fprintf (file, _(" [absolute position]"));
2269 if (! INTERWORK_SET (abfd))
2270 fprintf (file, _(" [interworking flag not initialised]"));
2271 else if (INTERWORK_FLAG (abfd))
2272 fprintf (file, _(" [interworking supported]"));
2274 fprintf (file, _(" [interworking not supported]"));
2281 /* Copies the given flags into the coff_tdata.flags field.
2282 Typically these flags come from the f_flags[] field of
2283 the COFF filehdr structure, which contains important,
2284 target specific information.
2285 Note: Although this function is static, it is explicitly
2286 called from both coffcode.h and peicode.h. */
2289 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2293 BFD_ASSERT (abfd != NULL);
2295 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2297 /* Make sure that the APCS field has not been initialised to the opposite
2300 && ( (APCS_26_FLAG (abfd) != flag)
2301 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2302 || (PIC_FLAG (abfd) != (flags & F_PIC))
2306 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2308 SET_APCS_FLAGS (abfd, flag);
2310 flag = (flags & F_INTERWORK);
2312 /* If the BFD has already had its interworking flag set, but it
2313 is different from the value that we have been asked to set,
2314 then assume that that merged code will not support interworking
2315 and set the flag accordingly. */
2316 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2319 /* xgettext: c-format */
2320 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2323 /* xgettext: c-format */
2324 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2329 SET_INTERWORK_FLAG (abfd, flag);
2334 /* Copy the important parts of the target specific data
2335 from one instance of a BFD to another. */
2338 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2340 BFD_ASSERT (src != NULL && dest != NULL);
2345 /* If the destination is not in the same format as the source, do not do
2347 if (src->xvec != dest->xvec)
2350 /* Copy the flags field. */
2353 if (APCS_SET (dest))
2355 /* If the src and dest have different APCS flag bits set, fail. */
2356 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2359 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2362 if (PIC_FLAG (dest) != PIC_FLAG (src))
2366 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2370 if (INTERWORK_SET (src))
2372 if (INTERWORK_SET (dest))
2374 /* If the src and dest have different interworking flags then turn
2375 off the interworking bit. */
2376 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2378 if (INTERWORK_FLAG (dest))
2380 /* xgettext:c-format */
2381 _bfd_error_handler (("\
2382 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2386 SET_INTERWORK_FLAG (dest, 0);
2391 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2398 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2399 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2400 #define LOCAL_LABEL_PREFIX ""
2401 #ifndef USER_LABEL_PREFIX
2402 #define USER_LABEL_PREFIX "_"
2405 /* Like _bfd_coff_is_local_label_name, but
2406 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2408 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2409 labels of the form Lxxx to be stripped. */
2412 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2415 #ifdef USER_LABEL_PREFIX
2416 if (USER_LABEL_PREFIX[0] != 0)
2418 size_t len = strlen (USER_LABEL_PREFIX);
2420 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2425 #ifdef LOCAL_LABEL_PREFIX
2426 /* If there is a prefix for local labels then look for this.
2427 If the prefix exists, but it is empty, then ignore the test. */
2429 if (LOCAL_LABEL_PREFIX[0] != 0)
2431 size_t len = strlen (LOCAL_LABEL_PREFIX);
2433 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2436 /* Perform the checks below for the rest of the name. */
2441 return name[0] == 'L';
2444 /* This piece of machinery exists only to guarantee that the bfd that holds
2445 the glue section is written last.
2447 This does depend on bfd_make_section attaching a new section to the
2448 end of the section list for the bfd. */
2451 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2453 return (sub->output_has_begun
2454 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2458 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2459 struct coff_final_link_info * pfinfo)
2461 struct coff_arm_link_hash_table * globals;
2463 globals = coff_arm_hash_table (pfinfo->info);
2465 BFD_ASSERT (globals != NULL);
2467 if (globals->bfd_of_glue_owner != NULL)
2469 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2472 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2475 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2478 #include "coffcode.h"
2480 #ifndef TARGET_LITTLE_SYM
2481 #define TARGET_LITTLE_SYM armcoff_little_vec
2483 #ifndef TARGET_LITTLE_NAME
2484 #define TARGET_LITTLE_NAME "coff-arm-little"
2486 #ifndef TARGET_BIG_SYM
2487 #define TARGET_BIG_SYM armcoff_big_vec
2489 #ifndef TARGET_BIG_NAME
2490 #define TARGET_BIG_NAME "coff-arm-big"
2493 #ifndef TARGET_UNDERSCORE
2494 #define TARGET_UNDERSCORE 0
2497 #ifndef EXTRA_S_FLAGS
2499 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2501 #define EXTRA_S_FLAGS SEC_CODE
2505 /* Forward declaration for use initialising alternative_target field. */
2506 extern const bfd_target TARGET_BIG_SYM ;
2508 /* Target vectors. */
2509 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2510 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)