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,
223 TRUE, /* partial_inplace. */
233 complain_overflow_bitfield,
236 TRUE, /* partial_inplace. */
246 complain_overflow_bitfield,
249 TRUE, /* partial_inplace. */
259 complain_overflow_signed,
260 aoutarm_fix_pcrel_26 ,
272 complain_overflow_signed,
273 coff_thumb_pcrel_12 ,
294 complain_overflow_bitfield,
297 TRUE, /* partial_inplace. */
307 complain_overflow_bitfield,
310 TRUE, /* partial_inplace. */
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. */
1218 if (howto->pc_relative && !info->relocatable)
1222 /* If we are doing a relocatable link, then we can just ignore
1223 a PC relative reloc that is pcrel_offset. It will already
1224 have the correct value. If this is not a relocatable link,
1225 then we should ignore the symbol value. */
1226 if (howto->pc_relative && howto->pcrel_offset)
1228 if (info->relocatable)
1230 /* FIXME - it is not clear which targets need this next test
1231 and which do not. It is known that it is needed for the
1232 VxWorks and EPOC-PE targets, but it is also known that it
1233 was suppressed for other ARM targets. This ought to be
1234 sorted out one day. */
1235 #ifdef ARM_COFF_BUGFIX
1236 /* We must not ignore the symbol value. If the symbol is
1237 within the same section, the relocation should have already
1238 been fixed, but if it is not, we'll be handed a reloc into
1239 the beginning of the symbol's section, so we must not cancel
1240 out the symbol's value, otherwise we'll be adding it in
1242 if (sym != NULL && sym->n_scnum != 0)
1243 addend += sym->n_value;
1255 sec = bfd_abs_section_ptr;
1260 sec = sections[symndx];
1261 val = (sec->output_section->vma
1262 + sec->output_offset
1269 /* We don't output the stubs if we are generating a
1270 relocatable output file, since we may as well leave the
1271 stub generation to the final linker pass. If we fail to
1272 verify that the name is defined, we'll try to build stubs
1273 for an undefined name... */
1274 if (! info->relocatable
1275 && ( h->root.type == bfd_link_hash_defined
1276 || h->root.type == bfd_link_hash_defweak))
1278 asection * h_sec = h->root.u.def.section;
1279 const char * name = h->root.root.string;
1281 /* h locates the symbol referenced in the reloc. */
1282 h_val = (h->root.u.def.value
1283 + h_sec->output_section->vma
1284 + h_sec->output_offset);
1286 if (howto->type == ARM_26)
1288 if ( h->class == C_THUMBSTATFUNC
1289 || h->class == C_THUMBEXTFUNC)
1291 /* Arm code calling a Thumb function. */
1292 unsigned long int tmp;
1295 long int ret_offset;
1296 struct coff_link_hash_entry * myh;
1297 struct coff_arm_link_hash_table * globals;
1299 myh = find_arm_glue (info, name, input_bfd);
1303 globals = coff_arm_hash_table (info);
1305 BFD_ASSERT (globals != NULL);
1306 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1308 my_offset = myh->root.u.def.value;
1310 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1311 ARM2THUMB_GLUE_SECTION_NAME);
1312 BFD_ASSERT (s != NULL);
1313 BFD_ASSERT (s->contents != NULL);
1314 BFD_ASSERT (s->output_section != NULL);
1316 if ((my_offset & 0x01) == 0x01)
1318 if (h_sec->owner != NULL
1319 && INTERWORK_SET (h_sec->owner)
1320 && ! INTERWORK_FLAG (h_sec->owner))
1322 /* xgettext:c-format */
1323 (_("%B(%s): warning: interworking not enabled.\n"
1324 " first occurrence: %B: arm call to thumb"),
1325 h_sec->owner, input_bfd, name);
1328 myh->root.u.def.value = my_offset;
1330 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1331 s->contents + my_offset);
1333 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1334 s->contents + my_offset + 4);
1336 /* It's a thumb address. Add the low order bit. */
1337 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1338 s->contents + my_offset + 8);
1340 if (info->base_file)
1341 arm_emit_base_file_entry (info, output_bfd, s,
1346 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1348 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1349 - input_section->vma);
1351 tmp = tmp & 0xFF000000;
1353 /* Somehow these are both 4 too far, so subtract 8. */
1357 + s->output_section->vma
1358 - (input_section->output_offset
1359 + input_section->output_section->vma
1363 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1365 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1366 contents + rel->r_vaddr - input_section->vma);
1372 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1373 else if (howto->type == ARM_THUMB23)
1375 if ( h->class == C_EXT
1376 || h->class == C_STAT
1377 || h->class == C_LABEL)
1379 /* Thumb code calling an ARM function. */
1382 unsigned long int tmp;
1383 long int ret_offset;
1384 struct coff_link_hash_entry * myh;
1385 struct coff_arm_link_hash_table * globals;
1387 myh = find_thumb_glue (info, name, input_bfd);
1391 globals = coff_arm_hash_table (info);
1393 BFD_ASSERT (globals != NULL);
1394 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1396 my_offset = myh->root.u.def.value;
1398 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1399 THUMB2ARM_GLUE_SECTION_NAME);
1401 BFD_ASSERT (s != NULL);
1402 BFD_ASSERT (s->contents != NULL);
1403 BFD_ASSERT (s->output_section != NULL);
1405 if ((my_offset & 0x01) == 0x01)
1407 if (h_sec->owner != NULL
1408 && INTERWORK_SET (h_sec->owner)
1409 && ! INTERWORK_FLAG (h_sec->owner)
1410 && ! globals->support_old_code)
1412 /* xgettext:c-format */
1413 (_("%B(%s): warning: interworking not enabled.\n"
1414 " first occurrence: %B: thumb call to arm\n"
1415 " consider relinking with --support-old-code enabled"),
1416 h_sec->owner, input_bfd, name);
1419 myh->root.u.def.value = my_offset;
1421 if (globals->support_old_code)
1423 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1424 s->contents + my_offset);
1426 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1427 s->contents + my_offset + 2);
1429 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1430 s->contents + my_offset + 4);
1432 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1433 s->contents + my_offset + 6);
1435 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1436 s->contents + my_offset + 8);
1438 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1439 s->contents + my_offset + 12);
1441 /* Store the address of the function in the last word of the stub. */
1442 bfd_put_32 (output_bfd, h_val,
1443 s->contents + my_offset + 16);
1445 if (info->base_file)
1446 arm_emit_base_file_entry (info, output_bfd, s,
1451 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1452 s->contents + my_offset);
1454 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1455 s->contents + my_offset + 2);
1458 /* Address of destination of the stub. */
1459 ((bfd_signed_vma) h_val)
1461 /* Offset from the start of the current section to the start of the stubs. */
1463 /* Offset of the start of this stub from the start of the stubs. */
1465 /* Address of the start of the current section. */
1466 + s->output_section->vma)
1467 /* The branch instruction is 4 bytes into the stub. */
1469 /* ARM branches work from the pc of the instruction + 8. */
1472 bfd_put_32 (output_bfd,
1473 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1474 s->contents + my_offset + 4);
1479 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1481 /* Now go back and fix up the original BL insn to point
1486 - (input_section->output_offset
1490 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1491 - input_section->vma);
1493 bfd_put_32 (output_bfd,
1494 (bfd_vma) insert_thumb_branch (tmp,
1496 contents + rel->r_vaddr - input_section->vma);
1504 /* If the relocation type and destination symbol does not
1505 fall into one of the above categories, then we can just
1506 perform a direct link. */
1509 rstat = bfd_reloc_ok;
1511 if ( h->root.type == bfd_link_hash_defined
1512 || h->root.type == bfd_link_hash_defweak)
1516 sec = h->root.u.def.section;
1517 val = (h->root.u.def.value
1518 + sec->output_section->vma
1519 + sec->output_offset);
1522 else if (! info->relocatable)
1524 if (! ((*info->callbacks->undefined_symbol)
1525 (info, h->root.root.string, input_bfd, input_section,
1526 rel->r_vaddr - input_section->vma, TRUE)))
1531 if (info->base_file)
1533 /* Emit a reloc if the backend thinks it needs it. */
1534 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1535 arm_emit_base_file_entry (info, output_bfd, input_section,
1540 rstat = bfd_reloc_ok;
1542 /* Only perform this fix during the final link, not a relocatable link. */
1543 else if (! info->relocatable
1544 && howto->type == ARM_THUMB23)
1546 /* This is pretty much a copy of what the default
1547 _bfd_final_link_relocate and _bfd_relocate_contents
1548 routines do to perform a relocation, with special
1549 processing for the split addressing of the Thumb BL
1550 instruction. Again, it would probably be simpler adding a
1551 ThumbBRANCH23 specific macro expansion into the default
1554 bfd_vma address = rel->r_vaddr - input_section->vma;
1556 if (address > high_address)
1557 rstat = bfd_reloc_outofrange;
1560 bfd_vma relocation = val + addend;
1561 int size = bfd_get_reloc_size (howto);
1562 bfd_boolean overflow = FALSE;
1563 bfd_byte *location = contents + address;
1564 bfd_vma x = bfd_get_32 (input_bfd, location);
1565 bfd_vma src_mask = 0x007FFFFE;
1566 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1567 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1569 bfd_signed_vma signed_check;
1571 bfd_signed_vma signed_add;
1573 BFD_ASSERT (size == 4);
1575 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1576 relocation -= (input_section->output_section->vma
1577 + input_section->output_offset);
1579 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1580 relocation -= address;
1582 /* No need to negate the relocation with BRANCH23. */
1583 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1584 /* howto->rightshift == 1 */
1586 /* Drop unwanted bits from the value we are relocating to. */
1587 check = relocation >> howto->rightshift;
1589 /* If this is a signed value, the rightshift just dropped
1590 leading 1 bits (assuming twos complement). */
1591 if ((bfd_signed_vma) relocation >= 0)
1592 signed_check = check;
1594 signed_check = (check
1596 & ~((bfd_vma) - 1 >> howto->rightshift)));
1598 /* Get the value from the object file. */
1599 if (bfd_big_endian (input_bfd))
1600 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1602 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1604 /* Get the value from the object file with an appropriate sign.
1605 The expression involving howto->src_mask isolates the upper
1606 bit of src_mask. If that bit is set in the value we are
1607 adding, it is negative, and we subtract out that number times
1608 two. If src_mask includes the highest possible bit, then we
1609 can not get the upper bit, but that does not matter since
1610 signed_add needs no adjustment to become negative in that
1614 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1615 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1617 /* howto->bitpos == 0 */
1618 /* Add the value from the object file, shifted so that it is a
1620 signed_check += signed_add;
1621 relocation += signed_add;
1623 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1625 /* Assumes two's complement. */
1626 if ( signed_check > reloc_signed_max
1627 || signed_check < reloc_signed_min)
1630 /* Put the relocation into the correct bits.
1631 For a BLX instruction, make sure that the relocation is rounded up
1632 to a word boundary. This follows the semantics of the instruction
1633 which specifies that bit 1 of the target address will come from bit
1634 1 of the base address. */
1635 if (bfd_big_endian (input_bfd))
1637 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1639 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1643 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1645 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1648 /* Add the relocation to the correct bits of X. */
1649 x = ((x & ~howto->dst_mask) | relocation);
1651 /* Put the relocated value back in the object file. */
1652 bfd_put_32 (input_bfd, x, location);
1654 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1659 if (info->relocatable && ! howto->partial_inplace)
1660 rstat = bfd_reloc_ok;
1662 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1664 rel->r_vaddr - input_section->vma,
1666 /* Only perform this fix during the final link, not a relocatable link. */
1667 if (! info->relocatable
1668 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1670 /* Determine if we need to set the bottom bit of a relocated address
1671 because the address is the address of a Thumb code symbol. */
1672 int patchit = FALSE;
1675 && ( h->class == C_THUMBSTATFUNC
1676 || h->class == C_THUMBEXTFUNC))
1680 else if (sym != NULL
1681 && sym->n_scnum > N_UNDEF)
1683 /* No hash entry - use the symbol instead. */
1684 if ( sym->n_sclass == C_THUMBSTATFUNC
1685 || sym->n_sclass == C_THUMBEXTFUNC)
1691 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1692 bfd_vma x = bfd_get_32 (input_bfd, location);
1694 bfd_put_32 (input_bfd, x | 1, location);
1704 case bfd_reloc_outofrange:
1705 (*_bfd_error_handler)
1706 (_("%B: bad reloc address 0x%lx in section `%A'"),
1707 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1709 case bfd_reloc_overflow:
1712 char buf[SYMNMLEN + 1];
1720 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1725 if (! ((*info->callbacks->reloc_overflow)
1726 (info, (h ? &h->root : NULL), name, howto->name,
1727 (bfd_vma) 0, input_bfd, input_section,
1728 rel->r_vaddr - input_section->vma)))
1737 #ifndef COFF_IMAGE_WITH_PE
1740 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1744 struct coff_arm_link_hash_table * globals;
1746 globals = coff_arm_hash_table (info);
1748 BFD_ASSERT (globals != NULL);
1750 if (globals->arm_glue_size != 0)
1752 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1754 s = bfd_get_section_by_name
1755 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1757 BFD_ASSERT (s != NULL);
1759 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1761 s->size = globals->arm_glue_size;
1765 if (globals->thumb_glue_size != 0)
1767 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1769 s = bfd_get_section_by_name
1770 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1772 BFD_ASSERT (s != NULL);
1774 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1776 s->size = globals->thumb_glue_size;
1784 record_arm_to_thumb_glue (struct bfd_link_info * info,
1785 struct coff_link_hash_entry * h)
1787 const char * name = h->root.root.string;
1788 register asection * s;
1790 struct coff_link_hash_entry * myh;
1791 struct bfd_link_hash_entry * bh;
1792 struct coff_arm_link_hash_table * globals;
1796 globals = coff_arm_hash_table (info);
1798 BFD_ASSERT (globals != NULL);
1799 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1801 s = bfd_get_section_by_name
1802 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1804 BFD_ASSERT (s != NULL);
1806 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1807 tmp_name = bfd_malloc (amt);
1809 BFD_ASSERT (tmp_name);
1811 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1813 myh = coff_link_hash_lookup
1814 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1819 /* We've already seen this guy. */
1823 /* The only trick here is using globals->arm_glue_size as the value. Even
1824 though the section isn't allocated yet, this is where we will be putting
1827 val = globals->arm_glue_size + 1;
1828 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1829 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1833 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1840 record_thumb_to_arm_glue (struct bfd_link_info * info,
1841 struct coff_link_hash_entry * h)
1843 const char * name = h->root.root.string;
1846 struct coff_link_hash_entry * myh;
1847 struct bfd_link_hash_entry * bh;
1848 struct coff_arm_link_hash_table * globals;
1852 globals = coff_arm_hash_table (info);
1854 BFD_ASSERT (globals != NULL);
1855 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1857 s = bfd_get_section_by_name
1858 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1860 BFD_ASSERT (s != NULL);
1862 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1863 tmp_name = bfd_malloc (amt);
1865 BFD_ASSERT (tmp_name);
1867 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1869 myh = coff_link_hash_lookup
1870 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1875 /* We've already seen this guy. */
1880 val = globals->thumb_glue_size + 1;
1881 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1882 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1884 /* If we mark it 'thumb', the disassembler will do a better job. */
1885 myh = (struct coff_link_hash_entry *) bh;
1886 myh->class = C_THUMBEXTFUNC;
1890 /* Allocate another symbol to mark where we switch to arm mode. */
1892 #define CHANGE_TO_ARM "__%s_change_to_arm"
1893 #define BACK_FROM_ARM "__%s_back_from_arm"
1895 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1896 tmp_name = bfd_malloc (amt);
1898 BFD_ASSERT (tmp_name);
1900 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1903 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1904 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1905 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1909 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1913 #endif /* not ARM_WINCE */
1915 /* Select a BFD to be used to hold the sections used by the glue code.
1916 This function is called from the linker scripts in ld/emultempl/
1920 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1921 struct bfd_link_info * info)
1923 struct coff_arm_link_hash_table * globals;
1927 /* If we are only performing a partial link do not bother
1928 getting a bfd to hold the glue. */
1929 if (info->relocatable)
1932 globals = coff_arm_hash_table (info);
1934 BFD_ASSERT (globals != NULL);
1936 if (globals->bfd_of_glue_owner != NULL)
1939 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1943 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1944 | SEC_CODE | SEC_READONLY);
1945 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1948 || ! bfd_set_section_alignment (abfd, sec, 2))
1952 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1956 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1957 | SEC_CODE | SEC_READONLY);
1958 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
1962 || ! bfd_set_section_alignment (abfd, sec, 2))
1966 /* Save the bfd for later use. */
1967 globals->bfd_of_glue_owner = abfd;
1973 bfd_arm_process_before_allocation (bfd * abfd,
1974 struct bfd_link_info * info,
1975 int support_old_code)
1978 struct coff_arm_link_hash_table * globals;
1980 /* If we are only performing a partial link do not bother
1981 to construct any glue. */
1982 if (info->relocatable)
1985 /* Here we have a bfd that is to be included on the link. We have a hook
1986 to do reloc rummaging, before section sizes are nailed down. */
1987 _bfd_coff_get_external_symbols (abfd);
1989 globals = coff_arm_hash_table (info);
1991 BFD_ASSERT (globals != NULL);
1992 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1994 globals->support_old_code = support_old_code;
1996 /* Rummage around all the relocs and map the glue vectors. */
1997 sec = abfd->sections;
2002 for (; sec != NULL; sec = sec->next)
2004 struct internal_reloc * i;
2005 struct internal_reloc * rel;
2007 if (sec->reloc_count == 0)
2010 /* Load the relocs. */
2011 /* FIXME: there may be a storage leak here. */
2012 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2014 BFD_ASSERT (i != 0);
2016 for (rel = i; rel < i + sec->reloc_count; ++rel)
2018 unsigned short r_type = rel->r_type;
2020 struct coff_link_hash_entry * h;
2022 symndx = rel->r_symndx;
2024 /* If the relocation is not against a symbol it cannot concern us. */
2028 /* If the index is outside of the range of our table, something has gone wrong. */
2029 if (symndx >= obj_conv_table_size (abfd))
2031 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2036 h = obj_coff_sym_hashes (abfd)[symndx];
2038 /* If the relocation is against a static symbol it must be within
2039 the current section and so cannot be a cross ARM/Thumb relocation. */
2046 /* This one is a call from arm code. We need to look up
2047 the target of the call. If it is a thumb target, we
2050 if (h->class == C_THUMBEXTFUNC)
2051 record_arm_to_thumb_glue (info, h);
2056 /* This one is a call from thumb code. We used to look
2057 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2058 up the target of the call. If it is an arm target, we
2059 insert glue. If the symbol does not exist it will be
2060 given a class of C_EXT and so we will generate a stub
2061 for it. This is not really a problem, since the link
2062 is doomed anyway. */
2069 record_thumb_to_arm_glue (info, h);
2086 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2088 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2089 #define coff_relocate_section coff_arm_relocate_section
2090 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2091 #define coff_adjust_symndx coff_arm_adjust_symndx
2092 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2093 #define coff_final_link_postscript coff_arm_final_link_postscript
2094 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2095 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2096 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2097 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2098 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2100 /* When doing a relocatable link, we want to convert ARM_26 relocs
2101 into ARM_26D relocs. */
2104 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2105 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2108 struct internal_reloc *irel,
2109 bfd_boolean *adjustedp)
2111 if (irel->r_type == ARM_26)
2113 struct coff_link_hash_entry *h;
2115 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2117 && (h->root.type == bfd_link_hash_defined
2118 || h->root.type == bfd_link_hash_defweak)
2119 && h->root.u.def.section->output_section == sec->output_section)
2120 irel->r_type = ARM_26D;
2126 /* Called when merging the private data areas of two BFDs.
2127 This is important as it allows us to detect if we are
2128 attempting to merge binaries compiled for different ARM
2129 targets, eg different CPUs or different APCS's. */
2132 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2134 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2139 /* If the two formats are different we cannot merge anything.
2140 This is not an error, since it is permissable to change the
2141 input and output formats. */
2142 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2143 || obfd->xvec->flavour != bfd_target_coff_flavour)
2146 /* Determine what should happen if the input ARM architecture
2147 does not match the output ARM architecture. */
2148 if (! bfd_arm_merge_machines (ibfd, obfd))
2151 /* Verify that the APCS is the same for the two BFDs. */
2152 if (APCS_SET (ibfd))
2154 if (APCS_SET (obfd))
2156 /* If the src and dest have different APCS flag bits set, fail. */
2157 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2160 /* xgettext: c-format */
2161 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2163 APCS_26_FLAG (ibfd) ? 26 : 32,
2164 APCS_26_FLAG (obfd) ? 26 : 32
2167 bfd_set_error (bfd_error_wrong_format);
2171 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2175 if (APCS_FLOAT_FLAG (ibfd))
2176 /* xgettext: c-format */
2177 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2179 /* xgettext: c-format */
2180 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2182 _bfd_error_handler (msg, ibfd, obfd);
2184 bfd_set_error (bfd_error_wrong_format);
2188 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2192 if (PIC_FLAG (ibfd))
2193 /* xgettext: c-format */
2194 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2196 /* xgettext: c-format */
2197 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2198 _bfd_error_handler (msg, ibfd, obfd);
2200 bfd_set_error (bfd_error_wrong_format);
2206 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2208 /* Set up the arch and fields as well as these are probably wrong. */
2209 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2213 /* Check the interworking support. */
2214 if (INTERWORK_SET (ibfd))
2216 if (INTERWORK_SET (obfd))
2218 /* If the src and dest differ in their interworking issue a warning. */
2219 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2223 if (INTERWORK_FLAG (ibfd))
2224 /* xgettext: c-format */
2225 msg = _("Warning: %B supports interworking, whereas %B does not");
2227 /* xgettext: c-format */
2228 msg = _("Warning: %B does not support interworking, whereas %B does");
2230 _bfd_error_handler (msg, ibfd, obfd);
2235 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2242 /* Display the flags field. */
2245 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2247 FILE * file = (FILE *) ptr;
2249 BFD_ASSERT (abfd != NULL && ptr != NULL);
2251 /* xgettext:c-format */
2252 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2254 if (APCS_SET (abfd))
2256 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2257 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2259 if (APCS_FLOAT_FLAG (abfd))
2260 fprintf (file, _(" [floats passed in float registers]"));
2262 fprintf (file, _(" [floats passed in integer registers]"));
2264 if (PIC_FLAG (abfd))
2265 fprintf (file, _(" [position independent]"));
2267 fprintf (file, _(" [absolute position]"));
2270 if (! INTERWORK_SET (abfd))
2271 fprintf (file, _(" [interworking flag not initialised]"));
2272 else if (INTERWORK_FLAG (abfd))
2273 fprintf (file, _(" [interworking supported]"));
2275 fprintf (file, _(" [interworking not supported]"));
2282 /* Copies the given flags into the coff_tdata.flags field.
2283 Typically these flags come from the f_flags[] field of
2284 the COFF filehdr structure, which contains important,
2285 target specific information.
2286 Note: Although this function is static, it is explicitly
2287 called from both coffcode.h and peicode.h. */
2290 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2294 BFD_ASSERT (abfd != NULL);
2296 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2298 /* Make sure that the APCS field has not been initialised to the opposite
2301 && ( (APCS_26_FLAG (abfd) != flag)
2302 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2303 || (PIC_FLAG (abfd) != (flags & F_PIC))
2307 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2309 SET_APCS_FLAGS (abfd, flag);
2311 flag = (flags & F_INTERWORK);
2313 /* If the BFD has already had its interworking flag set, but it
2314 is different from the value that we have been asked to set,
2315 then assume that that merged code will not support interworking
2316 and set the flag accordingly. */
2317 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2320 /* xgettext: c-format */
2321 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2324 /* xgettext: c-format */
2325 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2330 SET_INTERWORK_FLAG (abfd, flag);
2335 /* Copy the important parts of the target specific data
2336 from one instance of a BFD to another. */
2339 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2341 BFD_ASSERT (src != NULL && dest != NULL);
2346 /* If the destination is not in the same format as the source, do not do
2348 if (src->xvec != dest->xvec)
2351 /* Copy the flags field. */
2354 if (APCS_SET (dest))
2356 /* If the src and dest have different APCS flag bits set, fail. */
2357 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2360 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2363 if (PIC_FLAG (dest) != PIC_FLAG (src))
2367 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2371 if (INTERWORK_SET (src))
2373 if (INTERWORK_SET (dest))
2375 /* If the src and dest have different interworking flags then turn
2376 off the interworking bit. */
2377 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2379 if (INTERWORK_FLAG (dest))
2381 /* xgettext:c-format */
2382 _bfd_error_handler (("\
2383 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2387 SET_INTERWORK_FLAG (dest, 0);
2392 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2399 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2400 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2401 #define LOCAL_LABEL_PREFIX ""
2402 #ifndef USER_LABEL_PREFIX
2403 #define USER_LABEL_PREFIX "_"
2406 /* Like _bfd_coff_is_local_label_name, but
2407 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2409 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2410 labels of the form Lxxx to be stripped. */
2413 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2416 #ifdef USER_LABEL_PREFIX
2417 if (USER_LABEL_PREFIX[0] != 0)
2419 size_t len = strlen (USER_LABEL_PREFIX);
2421 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2426 #ifdef LOCAL_LABEL_PREFIX
2427 /* If there is a prefix for local labels then look for this.
2428 If the prefix exists, but it is empty, then ignore the test. */
2430 if (LOCAL_LABEL_PREFIX[0] != 0)
2432 size_t len = strlen (LOCAL_LABEL_PREFIX);
2434 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2437 /* Perform the checks below for the rest of the name. */
2442 return name[0] == 'L';
2445 /* This piece of machinery exists only to guarantee that the bfd that holds
2446 the glue section is written last.
2448 This does depend on bfd_make_section attaching a new section to the
2449 end of the section list for the bfd. */
2452 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2454 return (sub->output_has_begun
2455 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2459 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2460 struct coff_final_link_info * pfinfo)
2462 struct coff_arm_link_hash_table * globals;
2464 globals = coff_arm_hash_table (pfinfo->info);
2466 BFD_ASSERT (globals != NULL);
2468 if (globals->bfd_of_glue_owner != NULL)
2470 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2473 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2476 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2479 #include "coffcode.h"
2481 #ifndef TARGET_LITTLE_SYM
2482 #define TARGET_LITTLE_SYM armcoff_little_vec
2484 #ifndef TARGET_LITTLE_NAME
2485 #define TARGET_LITTLE_NAME "coff-arm-little"
2487 #ifndef TARGET_BIG_SYM
2488 #define TARGET_BIG_SYM armcoff_big_vec
2490 #ifndef TARGET_BIG_NAME
2491 #define TARGET_BIG_NAME "coff-arm-big"
2494 #ifndef TARGET_UNDERSCORE
2495 #define TARGET_UNDERSCORE 0
2498 #ifndef EXTRA_S_FLAGS
2500 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2502 #define EXTRA_S_FLAGS SEC_CODE
2506 /* Forward declaration for use initialising alternative_target field. */
2507 extern const bfd_target TARGET_BIG_SYM ;
2509 /* Target vectors. */
2510 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2511 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)