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, 2007
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 3 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,
22 MA 02110-1301, USA. */
28 #include "coff/internal.h"
36 /* Macros for manipulation the bits in the flags field of the coff data
38 #define APCS_26_FLAG(abfd) \
39 (coff_data (abfd)->flags & F_APCS_26)
41 #define APCS_FLOAT_FLAG(abfd) \
42 (coff_data (abfd)->flags & F_APCS_FLOAT)
44 #define PIC_FLAG(abfd) \
45 (coff_data (abfd)->flags & F_PIC)
47 #define APCS_SET(abfd) \
48 (coff_data (abfd)->flags & F_APCS_SET)
50 #define SET_APCS_FLAGS(abfd, flgs) \
53 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
54 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
58 #define INTERWORK_FLAG(abfd) \
59 (coff_data (abfd)->flags & F_INTERWORK)
61 #define INTERWORK_SET(abfd) \
62 (coff_data (abfd)->flags & F_INTERWORK_SET)
64 #define SET_INTERWORK_FLAG(abfd, flg) \
67 coff_data (abfd)->flags &= ~F_INTERWORK; \
68 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
73 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
76 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
77 /* Some typedefs for holding instructions. */
78 typedef unsigned long int insn32;
79 typedef unsigned short int insn16;
81 /* The linker script knows the section names for placement.
82 The entry_names are used to do simple name mangling on the stubs.
83 Given a function name, and its type, the stub can be found. The
84 name can be changed. The only requirement is the %s be present. */
86 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
87 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
89 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
90 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
92 /* Used by the assembler. */
94 static bfd_reloc_status_type
95 coff_arm_reloc (bfd *abfd,
97 asymbol *symbol ATTRIBUTE_UNUSED,
99 asection *input_section ATTRIBUTE_UNUSED,
101 char **error_message ATTRIBUTE_UNUSED)
105 if (output_bfd == NULL)
106 return bfd_reloc_continue;
108 diff = reloc_entry->addend;
111 x = ((x & ~howto->dst_mask) \
112 | (((x & howto->src_mask) + diff) & howto->dst_mask))
116 reloc_howto_type *howto = reloc_entry->howto;
117 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
123 char x = bfd_get_8 (abfd, addr);
125 bfd_put_8 (abfd, x, addr);
131 short x = bfd_get_16 (abfd, addr);
133 bfd_put_16 (abfd, (bfd_vma) x, addr);
139 long x = bfd_get_32 (abfd, addr);
141 bfd_put_32 (abfd, (bfd_vma) x, addr);
150 /* Now let bfd_perform_relocation finish everything up. */
151 return bfd_reloc_continue;
154 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
155 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
157 #ifndef TARGET_UNDERSCORE
158 #define TARGET_UNDERSCORE '_'
162 #define PCRELOFFSET TRUE
165 /* These most certainly belong somewhere else. Just had to get rid of
166 the manifest constants in the code. */
174 #define ARM_THUMB12 4
175 #define ARM_SECTION 14
176 #define ARM_SECREL 15
192 #define ARM_THUMB9 12
193 #define ARM_THUMB12 13
194 #define ARM_THUMB23 14
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;
542 #if defined COFF_WITH_PE && defined ARM_WINCE
543 if (rel->r_type == ARM_SECREL)
547 if (h && (h->type == bfd_link_hash_defined
548 || h->type == bfd_link_hash_defweak))
549 osect_vma = h->root.u.def.section->output_section->vma;
555 /* Sigh, the only way to get the section to offset against
556 is to find it the hard way. */
558 for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++)
561 osect_vma = sec->output_section->vma;
564 *addendp -= osect_vma;
571 /* Used by the assembler. */
573 static bfd_reloc_status_type
574 aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
575 arelent *reloc_entry ATTRIBUTE_UNUSED,
576 asymbol *symbol ATTRIBUTE_UNUSED,
577 void * data ATTRIBUTE_UNUSED,
578 asection *input_section ATTRIBUTE_UNUSED,
579 bfd *output_bfd ATTRIBUTE_UNUSED,
580 char **error_message ATTRIBUTE_UNUSED)
582 /* This is dead simple at present. */
586 /* Used by the assembler. */
588 static bfd_reloc_status_type
589 aoutarm_fix_pcrel_26 (bfd *abfd,
590 arelent *reloc_entry,
593 asection *input_section,
595 char **error_message ATTRIBUTE_UNUSED)
598 bfd_size_type addr = reloc_entry->address;
599 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
600 bfd_reloc_status_type flag = bfd_reloc_ok;
602 /* If this is an undefined symbol, return error. */
603 if (symbol->section == &bfd_und_section
604 && (symbol->flags & BSF_WEAK) == 0)
605 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
607 /* If the sections are different, and we are doing a partial relocation,
608 just ignore it for now. */
609 if (symbol->section->name != input_section->name
610 && output_bfd != (bfd *)NULL)
611 return bfd_reloc_continue;
613 relocation = (target & 0x00ffffff) << 2;
614 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
615 relocation += symbol->value;
616 relocation += symbol->section->output_section->vma;
617 relocation += symbol->section->output_offset;
618 relocation += reloc_entry->addend;
619 relocation -= input_section->output_section->vma;
620 relocation -= input_section->output_offset;
624 return bfd_reloc_overflow;
626 /* Check for overflow. */
627 if (relocation & 0x02000000)
629 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
630 flag = bfd_reloc_overflow;
632 else if (relocation & ~(bfd_vma) 0x03ffffff)
633 flag = bfd_reloc_overflow;
635 target &= ~0x00ffffff;
636 target |= (relocation >> 2) & 0x00ffffff;
637 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
639 /* Now the ARM magic... Change the reloc type so that it is marked as done.
640 Strictly this is only necessary if we are doing a partial relocation. */
641 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
646 static bfd_reloc_status_type
647 coff_thumb_pcrel_common (bfd *abfd,
648 arelent *reloc_entry,
651 asection *input_section,
653 char **error_message ATTRIBUTE_UNUSED,
654 thumb_pcrel_branchtype btype)
656 bfd_vma relocation = 0;
657 bfd_size_type addr = reloc_entry->address;
658 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
659 bfd_reloc_status_type flag = bfd_reloc_ok;
664 /* NOTE: This routine is currently used by GAS, but not by the link
671 signbit = 0x00000100;
677 signbit = 0x00000800;
683 signbit = 0x00400000;
690 /* If this is an undefined symbol, return error. */
691 if (symbol->section == &bfd_und_section
692 && (symbol->flags & BSF_WEAK) == 0)
693 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
695 /* If the sections are different, and we are doing a partial relocation,
696 just ignore it for now. */
697 if (symbol->section->name != input_section->name
698 && output_bfd != (bfd *)NULL)
699 return bfd_reloc_continue;
705 relocation = ((target & dstmsk) << 1);
709 if (bfd_big_endian (abfd))
710 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
712 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
719 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
720 relocation += symbol->value;
721 relocation += symbol->section->output_section->vma;
722 relocation += symbol->section->output_offset;
723 relocation += reloc_entry->addend;
724 relocation -= input_section->output_section->vma;
725 relocation -= input_section->output_offset;
729 return bfd_reloc_overflow;
731 /* Check for overflow. */
732 if (relocation & signbit)
734 if ((relocation & ~offmsk) != ~offmsk)
735 flag = bfd_reloc_overflow;
737 else if (relocation & ~offmsk)
738 flag = bfd_reloc_overflow;
745 target |= (relocation >> 1);
749 if (bfd_big_endian (abfd))
750 target |= (((relocation & 0xfff) >> 1)
751 | ((relocation << 4) & 0x07ff0000));
753 target |= (((relocation & 0xffe) << 15)
754 | ((relocation >> 12) & 0x7ff));
761 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
763 /* Now the ARM magic... Change the reloc type so that it is marked as done.
764 Strictly this is only necessary if we are doing a partial relocation. */
765 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
767 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
772 static bfd_reloc_status_type
773 coff_thumb_pcrel_23 (bfd *abfd,
774 arelent *reloc_entry,
777 asection *input_section,
779 char **error_message)
781 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
782 input_section, output_bfd, error_message,
786 static bfd_reloc_status_type
787 coff_thumb_pcrel_9 (bfd *abfd,
788 arelent *reloc_entry,
791 asection *input_section,
793 char **error_message)
795 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
796 input_section, output_bfd, error_message,
799 #endif /* not ARM_WINCE */
801 static bfd_reloc_status_type
802 coff_thumb_pcrel_12 (bfd *abfd,
803 arelent *reloc_entry,
806 asection *input_section,
808 char **error_message)
810 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
811 input_section, output_bfd, error_message,
815 static const struct reloc_howto_struct *
816 coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code)
818 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
820 if (code == BFD_RELOC_CTOR)
821 switch (bfd_get_arch_info (abfd)->bits_per_address)
833 ASTD (BFD_RELOC_32, ARM_32);
834 ASTD (BFD_RELOC_RVA, ARM_RVA32);
835 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
836 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
837 ASTD (BFD_RELOC_32_SECREL, ARM_SECREL);
839 ASTD (BFD_RELOC_8, ARM_8);
840 ASTD (BFD_RELOC_16, ARM_16);
841 ASTD (BFD_RELOC_32, ARM_32);
842 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
843 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
844 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
845 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
846 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
847 ASTD (BFD_RELOC_RVA, ARM_RVA32);
848 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
849 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
850 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
851 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
853 default: return NULL;
857 static reloc_howto_type *
858 coff_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
864 i < (sizeof (aoutarm_std_reloc_howto)
865 / sizeof (aoutarm_std_reloc_howto[0]));
867 if (aoutarm_std_reloc_howto[i].name != NULL
868 && strcasecmp (aoutarm_std_reloc_howto[i].name, r_name) == 0)
869 return &aoutarm_std_reloc_howto[i];
874 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
875 #define COFF_PAGE_SIZE 0x1000
877 /* Turn a howto into a reloc nunmber. */
878 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
879 #define BADMAG(x) ARMBADMAG(x)
880 #define ARM 1 /* Customize coffcode.h. */
883 /* Make sure that the 'r_offset' field is copied properly
884 so that identical binaries will compare the same. */
885 #define SWAP_IN_RELOC_OFFSET H_GET_32
886 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
889 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
890 This allows us to store global data here without actually creating any
891 global variables, which is a no-no in the BFD world. */
892 struct coff_arm_link_hash_table
894 /* The original coff_link_hash_table structure. MUST be first field. */
895 struct coff_link_hash_table root;
897 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
898 bfd_size_type thumb_glue_size;
900 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
901 bfd_size_type arm_glue_size;
903 /* An arbitrary input BFD chosen to hold the glue sections. */
904 bfd * bfd_of_glue_owner;
906 /* Support interworking with old, non-interworking aware ARM code. */
907 int support_old_code;
910 /* Get the ARM coff linker hash table from a link_info structure. */
911 #define coff_arm_hash_table(info) \
912 ((struct coff_arm_link_hash_table *) ((info)->hash))
914 /* Create an ARM coff linker hash table. */
916 static struct bfd_link_hash_table *
917 coff_arm_link_hash_table_create (bfd * abfd)
919 struct coff_arm_link_hash_table * ret;
920 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
922 ret = bfd_malloc (amt);
926 if (!_bfd_coff_link_hash_table_init (&ret->root,
928 _bfd_coff_link_hash_newfunc,
929 sizeof (struct coff_link_hash_entry)))
935 ret->thumb_glue_size = 0;
936 ret->arm_glue_size = 0;
937 ret->bfd_of_glue_owner = NULL;
939 return & ret->root.root;
943 arm_emit_base_file_entry (struct bfd_link_info *info,
945 asection *input_section,
946 bfd_vma reloc_offset)
948 bfd_vma addr = (reloc_offset
950 + input_section->output_offset
951 + input_section->output_section->vma);
953 if (coff_data (output_bfd)->pe)
954 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
955 if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1)
958 bfd_set_error (bfd_error_system_call);
963 /* The thumb form of a long branch is a bit finicky, because the offset
964 encoding is split over two fields, each in it's own instruction. They
965 can occur in any order. So given a thumb form of long branch, and an
966 offset, insert the offset into the thumb branch and return finished
969 It takes two thumb instructions to encode the target address. Each has
970 11 bits to invest. The upper 11 bits are stored in one (identified by
971 H-0.. see below), the lower 11 bits are stored in the other (identified
974 Combine together and shifted left by 1 (it's a half word address) and
978 H-0, upper address-0 = 000
980 H-1, lower address-0 = 800
982 They can be ordered either way, but the arm tools I've seen always put
983 the lower one first. It probably doesn't matter. krk@cygnus.com
985 XXX: Actually the order does matter. The second instruction (H-1)
986 moves the computed address into the PC, so it must be the second one
987 in the sequence. The problem, however is that whilst little endian code
988 stores the instructions in HI then LOW order, big endian code does the
989 reverse. nickc@cygnus.com. */
991 #define LOW_HI_ORDER 0xF800F000
992 #define HI_LOW_ORDER 0xF000F800
995 insert_thumb_branch (insn32 br_insn, int rel_off)
997 unsigned int low_bits;
998 unsigned int high_bits;
1000 BFD_ASSERT ((rel_off & 1) != 1);
1002 rel_off >>= 1; /* Half word aligned address. */
1003 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
1004 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
1006 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1007 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1008 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1009 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1011 /* FIXME: the BFD library should never abort except for internal errors
1012 - it should return an error status. */
1013 abort (); /* Error - not a valid branch instruction form. */
1019 static struct coff_link_hash_entry *
1020 find_thumb_glue (struct bfd_link_info *info,
1025 struct coff_link_hash_entry *myh;
1026 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1028 tmp_name = bfd_malloc (amt);
1030 BFD_ASSERT (tmp_name);
1032 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1034 myh = coff_link_hash_lookup
1035 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1038 /* xgettext:c-format */
1039 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
1040 input_bfd, tmp_name, name);
1046 #endif /* not ARM_WINCE */
1048 static struct coff_link_hash_entry *
1049 find_arm_glue (struct bfd_link_info *info,
1054 struct coff_link_hash_entry * myh;
1055 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1057 tmp_name = bfd_malloc (amt);
1059 BFD_ASSERT (tmp_name);
1061 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1063 myh = coff_link_hash_lookup
1064 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1067 /* xgettext:c-format */
1068 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1069 input_bfd, tmp_name, name);
1081 ldr r12, __func_addr
1084 .word func @ behave as if you saw a ARM_32 reloc
1087 #define ARM2THUMB_GLUE_SIZE 12
1088 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1089 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1090 static const insn32 a2t3_func_addr_insn = 0x00000001;
1093 Thumb->ARM: Thumb->(non-interworking aware) ARM
1097 __func_from_thumb: __func_from_thumb:
1099 nop ldr r6, __func_addr
1101 __func_change_to_arm: bx r6
1103 __func_back_to_thumb:
1110 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1112 static const insn16 t2a1_bx_pc_insn = 0x4778;
1113 static const insn16 t2a2_noop_insn = 0x46c0;
1114 static const insn32 t2a3_b_insn = 0xea000000;
1116 static const insn16 t2a1_push_insn = 0xb540;
1117 static const insn16 t2a2_ldr_insn = 0x4e03;
1118 static const insn16 t2a3_mov_insn = 0x46fe;
1119 static const insn16 t2a4_bx_insn = 0x4730;
1120 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1121 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1125 We should really create new local (static) symbols in destination
1126 object for each stub we create. We should also create local
1127 (static) symbols within the stubs when switching between ARM and
1128 Thumb code. This will ensure that the debugger and disassembler
1129 can present a better view of stubs.
1131 We can treat stubs like literal sections, and for the THUMB9 ones
1132 (short addressing range) we should be able to insert the stubs
1133 between sections. i.e. the simplest approach (since relocations
1134 are done on a section basis) is to dump the stubs at the end of
1135 processing a section. That way we can always try and minimise the
1136 offset to and from a stub. However, this does not map well onto
1137 the way that the linker/BFD does its work: mapping all input
1138 sections to output sections via the linker script before doing
1141 Unfortunately it may be easier to just to disallow short range
1142 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1143 only branch-and-link (BL) calls. This will simplify the processing
1144 since we can then put all of the stubs into their own section.
1147 On a different subject, rather than complaining when a
1148 branch cannot fit in the number of bits available for the
1149 instruction we should generate a trampoline stub (needed to
1150 address the complete 32bit address space). */
1152 /* The standard COFF backend linker does not cope with the special
1153 Thumb BRANCH23 relocation. The alternative would be to split the
1154 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1155 bit simpler simply providing our own relocation driver. */
1157 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1158 This code is a very slightly modified copy of
1159 _bfd_coff_generic_relocate_section. It would be a much more
1160 maintainable solution to have a MACRO that could be expanded within
1161 _bfd_coff_generic_relocate_section that would only be provided for
1162 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1163 is different from the original. */
1166 coff_arm_relocate_section (bfd *output_bfd,
1167 struct bfd_link_info *info,
1169 asection *input_section,
1171 struct internal_reloc *relocs,
1172 struct internal_syment *syms,
1173 asection **sections)
1175 struct internal_reloc * rel;
1176 struct internal_reloc * relend;
1178 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1182 relend = rel + input_section->reloc_count;
1184 for (; rel < relend; rel++)
1188 struct coff_link_hash_entry * h;
1189 struct internal_syment * sym;
1192 reloc_howto_type * howto;
1193 bfd_reloc_status_type rstat;
1196 symndx = rel->r_symndx;
1205 h = obj_coff_sym_hashes (input_bfd)[symndx];
1206 sym = syms + symndx;
1209 /* COFF treats common symbols in one of two ways. Either the
1210 size of the symbol is included in the section contents, or it
1211 is not. We assume that the size is not included, and force
1212 the rtype_to_howto function to adjust the addend as needed. */
1214 if (sym != NULL && sym->n_scnum != 0)
1215 addend = - sym->n_value;
1219 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1224 /* The relocation_section function will skip pcrel_offset relocs
1225 when doing a relocatable link. However, we want to convert
1226 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1227 this case without pcrel_offset set, and adjust the addend to
1228 compensate. 'partial_inplace' is also set, since we want 'done'
1229 relocations to be reflected in section's data. */
1230 if (rel->r_type == ARM_26
1232 && info->relocatable
1233 && (h->root.type == bfd_link_hash_defined
1234 || h->root.type == bfd_link_hash_defweak)
1235 && (h->root.u.def.section->output_section
1236 == input_section->output_section))
1238 static reloc_howto_type fake_arm26_reloc =
1245 complain_overflow_signed,
1246 aoutarm_fix_pcrel_26 ,
1253 addend -= rel->r_vaddr - input_section->vma;
1255 /* FIXME: I don't know why, but the hack is necessary for correct
1256 generation of bl's instruction offset. */
1259 howto = & fake_arm26_reloc;
1263 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1264 the next opcode's pc, so is off by one. */
1265 if (howto->pc_relative && !info->relocatable)
1269 /* If we are doing a relocatable link, then we can just ignore
1270 a PC relative reloc that is pcrel_offset. It will already
1271 have the correct value. If this is not a relocatable link,
1272 then we should ignore the symbol value. */
1273 if (howto->pc_relative && howto->pcrel_offset)
1275 if (info->relocatable)
1277 /* FIXME - it is not clear which targets need this next test
1278 and which do not. It is known that it is needed for the
1279 VxWorks and EPOC-PE targets, but it is also known that it
1280 was suppressed for other ARM targets. This ought to be
1281 sorted out one day. */
1282 #ifdef ARM_COFF_BUGFIX
1283 /* We must not ignore the symbol value. If the symbol is
1284 within the same section, the relocation should have already
1285 been fixed, but if it is not, we'll be handed a reloc into
1286 the beginning of the symbol's section, so we must not cancel
1287 out the symbol's value, otherwise we'll be adding it in
1289 if (sym != NULL && sym->n_scnum != 0)
1290 addend += sym->n_value;
1302 sec = bfd_abs_section_ptr;
1307 sec = sections[symndx];
1308 val = (sec->output_section->vma
1309 + sec->output_offset
1316 /* We don't output the stubs if we are generating a
1317 relocatable output file, since we may as well leave the
1318 stub generation to the final linker pass. If we fail to
1319 verify that the name is defined, we'll try to build stubs
1320 for an undefined name... */
1321 if (! info->relocatable
1322 && ( h->root.type == bfd_link_hash_defined
1323 || h->root.type == bfd_link_hash_defweak))
1325 asection * h_sec = h->root.u.def.section;
1326 const char * name = h->root.root.string;
1328 /* h locates the symbol referenced in the reloc. */
1329 h_val = (h->root.u.def.value
1330 + h_sec->output_section->vma
1331 + h_sec->output_offset);
1333 if (howto->type == ARM_26)
1335 if ( h->class == C_THUMBSTATFUNC
1336 || h->class == C_THUMBEXTFUNC)
1338 /* Arm code calling a Thumb function. */
1339 unsigned long int tmp;
1342 long int ret_offset;
1343 struct coff_link_hash_entry * myh;
1344 struct coff_arm_link_hash_table * globals;
1346 myh = find_arm_glue (info, name, input_bfd);
1350 globals = coff_arm_hash_table (info);
1352 BFD_ASSERT (globals != NULL);
1353 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1355 my_offset = myh->root.u.def.value;
1357 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1358 ARM2THUMB_GLUE_SECTION_NAME);
1359 BFD_ASSERT (s != NULL);
1360 BFD_ASSERT (s->contents != NULL);
1361 BFD_ASSERT (s->output_section != NULL);
1363 if ((my_offset & 0x01) == 0x01)
1365 if (h_sec->owner != NULL
1366 && INTERWORK_SET (h_sec->owner)
1367 && ! INTERWORK_FLAG (h_sec->owner))
1369 /* xgettext:c-format */
1370 (_("%B(%s): warning: interworking not enabled.\n"
1371 " first occurrence: %B: arm call to thumb"),
1372 h_sec->owner, input_bfd, name);
1375 myh->root.u.def.value = my_offset;
1377 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1378 s->contents + my_offset);
1380 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1381 s->contents + my_offset + 4);
1383 /* It's a thumb address. Add the low order bit. */
1384 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1385 s->contents + my_offset + 8);
1388 && !arm_emit_base_file_entry (info, output_bfd,
1393 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1395 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1396 - input_section->vma);
1398 tmp = tmp & 0xFF000000;
1400 /* Somehow these are both 4 too far, so subtract 8. */
1404 + s->output_section->vma
1405 - (input_section->output_offset
1406 + input_section->output_section->vma
1410 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1412 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1413 contents + rel->r_vaddr - input_section->vma);
1419 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1420 else if (howto->type == ARM_THUMB23)
1422 if ( h->class == C_EXT
1423 || h->class == C_STAT
1424 || h->class == C_LABEL)
1426 /* Thumb code calling an ARM function. */
1429 unsigned long int tmp;
1430 long int ret_offset;
1431 struct coff_link_hash_entry * myh;
1432 struct coff_arm_link_hash_table * globals;
1434 myh = find_thumb_glue (info, name, input_bfd);
1438 globals = coff_arm_hash_table (info);
1440 BFD_ASSERT (globals != NULL);
1441 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1443 my_offset = myh->root.u.def.value;
1445 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1446 THUMB2ARM_GLUE_SECTION_NAME);
1448 BFD_ASSERT (s != NULL);
1449 BFD_ASSERT (s->contents != NULL);
1450 BFD_ASSERT (s->output_section != NULL);
1452 if ((my_offset & 0x01) == 0x01)
1454 if (h_sec->owner != NULL
1455 && INTERWORK_SET (h_sec->owner)
1456 && ! INTERWORK_FLAG (h_sec->owner)
1457 && ! globals->support_old_code)
1459 /* xgettext:c-format */
1460 (_("%B(%s): warning: interworking not enabled.\n"
1461 " first occurrence: %B: thumb call to arm\n"
1462 " consider relinking with --support-old-code enabled"),
1463 h_sec->owner, input_bfd, name);
1466 myh->root.u.def.value = my_offset;
1468 if (globals->support_old_code)
1470 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1471 s->contents + my_offset);
1473 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1474 s->contents + my_offset + 2);
1476 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1477 s->contents + my_offset + 4);
1479 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1480 s->contents + my_offset + 6);
1482 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1483 s->contents + my_offset + 8);
1485 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1486 s->contents + my_offset + 12);
1488 /* Store the address of the function in the last word of the stub. */
1489 bfd_put_32 (output_bfd, h_val,
1490 s->contents + my_offset + 16);
1493 && !arm_emit_base_file_entry (info,
1500 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1501 s->contents + my_offset);
1503 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1504 s->contents + my_offset + 2);
1507 /* Address of destination of the stub. */
1508 ((bfd_signed_vma) h_val)
1510 /* Offset from the start of the current section to the start of the stubs. */
1512 /* Offset of the start of this stub from the start of the stubs. */
1514 /* Address of the start of the current section. */
1515 + s->output_section->vma)
1516 /* The branch instruction is 4 bytes into the stub. */
1518 /* ARM branches work from the pc of the instruction + 8. */
1521 bfd_put_32 (output_bfd,
1522 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1523 s->contents + my_offset + 4);
1528 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1530 /* Now go back and fix up the original BL insn to point
1535 - (input_section->output_offset
1539 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1540 - input_section->vma);
1542 bfd_put_32 (output_bfd,
1543 (bfd_vma) insert_thumb_branch (tmp,
1545 contents + rel->r_vaddr - input_section->vma);
1553 /* If the relocation type and destination symbol does not
1554 fall into one of the above categories, then we can just
1555 perform a direct link. */
1558 rstat = bfd_reloc_ok;
1560 if ( h->root.type == bfd_link_hash_defined
1561 || h->root.type == bfd_link_hash_defweak)
1565 sec = h->root.u.def.section;
1566 val = (h->root.u.def.value
1567 + sec->output_section->vma
1568 + sec->output_offset);
1571 else if (! info->relocatable)
1573 if (! ((*info->callbacks->undefined_symbol)
1574 (info, h->root.root.string, input_bfd, input_section,
1575 rel->r_vaddr - input_section->vma, TRUE)))
1580 /* Emit a reloc if the backend thinks it needs it. */
1583 && pe_data(output_bfd)->in_reloc_p(output_bfd, howto)
1584 && !arm_emit_base_file_entry (info, output_bfd, input_section,
1589 rstat = bfd_reloc_ok;
1591 /* Only perform this fix during the final link, not a relocatable link. */
1592 else if (! info->relocatable
1593 && howto->type == ARM_THUMB23)
1595 /* This is pretty much a copy of what the default
1596 _bfd_final_link_relocate and _bfd_relocate_contents
1597 routines do to perform a relocation, with special
1598 processing for the split addressing of the Thumb BL
1599 instruction. Again, it would probably be simpler adding a
1600 ThumbBRANCH23 specific macro expansion into the default
1603 bfd_vma address = rel->r_vaddr - input_section->vma;
1605 if (address > high_address)
1606 rstat = bfd_reloc_outofrange;
1609 bfd_vma relocation = val + addend;
1610 int size = bfd_get_reloc_size (howto);
1611 bfd_boolean overflow = FALSE;
1612 bfd_byte *location = contents + address;
1613 bfd_vma x = bfd_get_32 (input_bfd, location);
1614 bfd_vma src_mask = 0x007FFFFE;
1615 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1616 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1618 bfd_signed_vma signed_check;
1620 bfd_signed_vma signed_add;
1622 BFD_ASSERT (size == 4);
1624 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1625 relocation -= (input_section->output_section->vma
1626 + input_section->output_offset);
1628 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1629 relocation -= address;
1631 /* No need to negate the relocation with BRANCH23. */
1632 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1633 /* howto->rightshift == 1 */
1635 /* Drop unwanted bits from the value we are relocating to. */
1636 check = relocation >> howto->rightshift;
1638 /* If this is a signed value, the rightshift just dropped
1639 leading 1 bits (assuming twos complement). */
1640 if ((bfd_signed_vma) relocation >= 0)
1641 signed_check = check;
1643 signed_check = (check
1645 & ~((bfd_vma) - 1 >> howto->rightshift)));
1647 /* Get the value from the object file. */
1648 if (bfd_big_endian (input_bfd))
1649 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1651 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1653 /* Get the value from the object file with an appropriate sign.
1654 The expression involving howto->src_mask isolates the upper
1655 bit of src_mask. If that bit is set in the value we are
1656 adding, it is negative, and we subtract out that number times
1657 two. If src_mask includes the highest possible bit, then we
1658 can not get the upper bit, but that does not matter since
1659 signed_add needs no adjustment to become negative in that
1663 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1664 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1666 /* howto->bitpos == 0 */
1667 /* Add the value from the object file, shifted so that it is a
1669 signed_check += signed_add;
1670 relocation += signed_add;
1672 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1674 /* Assumes two's complement. */
1675 if ( signed_check > reloc_signed_max
1676 || signed_check < reloc_signed_min)
1679 /* Put the relocation into the correct bits.
1680 For a BLX instruction, make sure that the relocation is rounded up
1681 to a word boundary. This follows the semantics of the instruction
1682 which specifies that bit 1 of the target address will come from bit
1683 1 of the base address. */
1684 if (bfd_big_endian (input_bfd))
1686 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1688 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1692 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1694 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1697 /* Add the relocation to the correct bits of X. */
1698 x = ((x & ~howto->dst_mask) | relocation);
1700 /* Put the relocated value back in the object file. */
1701 bfd_put_32 (input_bfd, x, location);
1703 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1708 if (info->relocatable && ! howto->partial_inplace)
1709 rstat = bfd_reloc_ok;
1711 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1713 rel->r_vaddr - input_section->vma,
1715 /* Only perform this fix during the final link, not a relocatable link. */
1716 if (! info->relocatable
1717 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1719 /* Determine if we need to set the bottom bit of a relocated address
1720 because the address is the address of a Thumb code symbol. */
1721 int patchit = FALSE;
1724 && ( h->class == C_THUMBSTATFUNC
1725 || h->class == C_THUMBEXTFUNC))
1729 else if (sym != NULL
1730 && sym->n_scnum > N_UNDEF)
1732 /* No hash entry - use the symbol instead. */
1733 if ( sym->n_sclass == C_THUMBSTATFUNC
1734 || sym->n_sclass == C_THUMBEXTFUNC)
1740 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1741 bfd_vma x = bfd_get_32 (input_bfd, location);
1743 bfd_put_32 (input_bfd, x | 1, location);
1753 case bfd_reloc_outofrange:
1754 (*_bfd_error_handler)
1755 (_("%B: bad reloc address 0x%lx in section `%A'"),
1756 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1758 case bfd_reloc_overflow:
1761 char buf[SYMNMLEN + 1];
1769 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1774 if (! ((*info->callbacks->reloc_overflow)
1775 (info, (h ? &h->root : NULL), name, howto->name,
1776 (bfd_vma) 0, input_bfd, input_section,
1777 rel->r_vaddr - input_section->vma)))
1786 #ifndef COFF_IMAGE_WITH_PE
1789 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1793 struct coff_arm_link_hash_table * globals;
1795 globals = coff_arm_hash_table (info);
1797 BFD_ASSERT (globals != NULL);
1799 if (globals->arm_glue_size != 0)
1801 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1803 s = bfd_get_section_by_name
1804 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1806 BFD_ASSERT (s != NULL);
1808 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1810 s->size = globals->arm_glue_size;
1814 if (globals->thumb_glue_size != 0)
1816 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1818 s = bfd_get_section_by_name
1819 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1821 BFD_ASSERT (s != NULL);
1823 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1825 s->size = globals->thumb_glue_size;
1833 record_arm_to_thumb_glue (struct bfd_link_info * info,
1834 struct coff_link_hash_entry * h)
1836 const char * name = h->root.root.string;
1837 register asection * s;
1839 struct coff_link_hash_entry * myh;
1840 struct bfd_link_hash_entry * bh;
1841 struct coff_arm_link_hash_table * globals;
1845 globals = coff_arm_hash_table (info);
1847 BFD_ASSERT (globals != NULL);
1848 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1850 s = bfd_get_section_by_name
1851 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1853 BFD_ASSERT (s != NULL);
1855 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1856 tmp_name = bfd_malloc (amt);
1858 BFD_ASSERT (tmp_name);
1860 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1862 myh = coff_link_hash_lookup
1863 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1868 /* We've already seen this guy. */
1872 /* The only trick here is using globals->arm_glue_size as the value. Even
1873 though the section isn't allocated yet, this is where we will be putting
1876 val = globals->arm_glue_size + 1;
1877 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1878 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1882 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1889 record_thumb_to_arm_glue (struct bfd_link_info * info,
1890 struct coff_link_hash_entry * h)
1892 const char * name = h->root.root.string;
1895 struct coff_link_hash_entry * myh;
1896 struct bfd_link_hash_entry * bh;
1897 struct coff_arm_link_hash_table * globals;
1901 globals = coff_arm_hash_table (info);
1903 BFD_ASSERT (globals != NULL);
1904 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1906 s = bfd_get_section_by_name
1907 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1909 BFD_ASSERT (s != NULL);
1911 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1912 tmp_name = bfd_malloc (amt);
1914 BFD_ASSERT (tmp_name);
1916 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1918 myh = coff_link_hash_lookup
1919 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1924 /* We've already seen this guy. */
1929 val = globals->thumb_glue_size + 1;
1930 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1931 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1933 /* If we mark it 'thumb', the disassembler will do a better job. */
1934 myh = (struct coff_link_hash_entry *) bh;
1935 myh->class = C_THUMBEXTFUNC;
1939 /* Allocate another symbol to mark where we switch to arm mode. */
1941 #define CHANGE_TO_ARM "__%s_change_to_arm"
1942 #define BACK_FROM_ARM "__%s_back_from_arm"
1944 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1945 tmp_name = bfd_malloc (amt);
1947 BFD_ASSERT (tmp_name);
1949 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1952 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1953 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1954 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1958 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1962 #endif /* not ARM_WINCE */
1964 /* Select a BFD to be used to hold the sections used by the glue code.
1965 This function is called from the linker scripts in ld/emultempl/
1969 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1970 struct bfd_link_info * info)
1972 struct coff_arm_link_hash_table * globals;
1976 /* If we are only performing a partial link do not bother
1977 getting a bfd to hold the glue. */
1978 if (info->relocatable)
1981 globals = coff_arm_hash_table (info);
1983 BFD_ASSERT (globals != NULL);
1985 if (globals->bfd_of_glue_owner != NULL)
1988 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1992 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1993 | SEC_CODE | SEC_READONLY);
1994 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1997 || ! bfd_set_section_alignment (abfd, sec, 2))
2001 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2005 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2006 | SEC_CODE | SEC_READONLY);
2007 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
2011 || ! bfd_set_section_alignment (abfd, sec, 2))
2015 /* Save the bfd for later use. */
2016 globals->bfd_of_glue_owner = abfd;
2022 bfd_arm_process_before_allocation (bfd * abfd,
2023 struct bfd_link_info * info,
2024 int support_old_code)
2027 struct coff_arm_link_hash_table * globals;
2029 /* If we are only performing a partial link do not bother
2030 to construct any glue. */
2031 if (info->relocatable)
2034 /* Here we have a bfd that is to be included on the link. We have a hook
2035 to do reloc rummaging, before section sizes are nailed down. */
2036 _bfd_coff_get_external_symbols (abfd);
2038 globals = coff_arm_hash_table (info);
2040 BFD_ASSERT (globals != NULL);
2041 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2043 globals->support_old_code = support_old_code;
2045 /* Rummage around all the relocs and map the glue vectors. */
2046 sec = abfd->sections;
2051 for (; sec != NULL; sec = sec->next)
2053 struct internal_reloc * i;
2054 struct internal_reloc * rel;
2056 if (sec->reloc_count == 0)
2059 /* Load the relocs. */
2060 /* FIXME: there may be a storage leak here. */
2061 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2063 BFD_ASSERT (i != 0);
2065 for (rel = i; rel < i + sec->reloc_count; ++rel)
2067 unsigned short r_type = rel->r_type;
2069 struct coff_link_hash_entry * h;
2071 symndx = rel->r_symndx;
2073 /* If the relocation is not against a symbol it cannot concern us. */
2077 /* If the index is outside of the range of our table, something has gone wrong. */
2078 if (symndx >= obj_conv_table_size (abfd))
2080 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2085 h = obj_coff_sym_hashes (abfd)[symndx];
2087 /* If the relocation is against a static symbol it must be within
2088 the current section and so cannot be a cross ARM/Thumb relocation. */
2095 /* This one is a call from arm code. We need to look up
2096 the target of the call. If it is a thumb target, we
2099 if (h->class == C_THUMBEXTFUNC)
2100 record_arm_to_thumb_glue (info, h);
2105 /* This one is a call from thumb code. We used to look
2106 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2107 up the target of the call. If it is an arm target, we
2108 insert glue. If the symbol does not exist it will be
2109 given a class of C_EXT and so we will generate a stub
2110 for it. This is not really a problem, since the link
2111 is doomed anyway. */
2118 record_thumb_to_arm_glue (info, h);
2135 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2137 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2138 #define coff_bfd_reloc_name_lookup coff_arm_reloc_name_lookup
2139 #define coff_relocate_section coff_arm_relocate_section
2140 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2141 #define coff_adjust_symndx coff_arm_adjust_symndx
2142 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2143 #define coff_final_link_postscript coff_arm_final_link_postscript
2144 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2145 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2146 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2147 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2148 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2150 /* When doing a relocatable link, we want to convert ARM_26 relocs
2151 into ARM_26D relocs. */
2154 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2155 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2158 struct internal_reloc *irel,
2159 bfd_boolean *adjustedp)
2161 if (irel->r_type == ARM_26)
2163 struct coff_link_hash_entry *h;
2165 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2167 && (h->root.type == bfd_link_hash_defined
2168 || h->root.type == bfd_link_hash_defweak)
2169 && h->root.u.def.section->output_section == sec->output_section)
2170 irel->r_type = ARM_26D;
2176 /* Called when merging the private data areas of two BFDs.
2177 This is important as it allows us to detect if we are
2178 attempting to merge binaries compiled for different ARM
2179 targets, eg different CPUs or different APCS's. */
2182 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2184 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2189 /* If the two formats are different we cannot merge anything.
2190 This is not an error, since it is permissable to change the
2191 input and output formats. */
2192 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2193 || obfd->xvec->flavour != bfd_target_coff_flavour)
2196 /* Determine what should happen if the input ARM architecture
2197 does not match the output ARM architecture. */
2198 if (! bfd_arm_merge_machines (ibfd, obfd))
2201 /* Verify that the APCS is the same for the two BFDs. */
2202 if (APCS_SET (ibfd))
2204 if (APCS_SET (obfd))
2206 /* If the src and dest have different APCS flag bits set, fail. */
2207 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2210 /* xgettext: c-format */
2211 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2213 APCS_26_FLAG (ibfd) ? 26 : 32,
2214 APCS_26_FLAG (obfd) ? 26 : 32
2217 bfd_set_error (bfd_error_wrong_format);
2221 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2225 if (APCS_FLOAT_FLAG (ibfd))
2226 /* xgettext: c-format */
2227 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2229 /* xgettext: c-format */
2230 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2232 _bfd_error_handler (msg, ibfd, obfd);
2234 bfd_set_error (bfd_error_wrong_format);
2238 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2242 if (PIC_FLAG (ibfd))
2243 /* xgettext: c-format */
2244 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2246 /* xgettext: c-format */
2247 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2248 _bfd_error_handler (msg, ibfd, obfd);
2250 bfd_set_error (bfd_error_wrong_format);
2256 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2258 /* Set up the arch and fields as well as these are probably wrong. */
2259 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2263 /* Check the interworking support. */
2264 if (INTERWORK_SET (ibfd))
2266 if (INTERWORK_SET (obfd))
2268 /* If the src and dest differ in their interworking issue a warning. */
2269 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2273 if (INTERWORK_FLAG (ibfd))
2274 /* xgettext: c-format */
2275 msg = _("Warning: %B supports interworking, whereas %B does not");
2277 /* xgettext: c-format */
2278 msg = _("Warning: %B does not support interworking, whereas %B does");
2280 _bfd_error_handler (msg, ibfd, obfd);
2285 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2292 /* Display the flags field. */
2295 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2297 FILE * file = (FILE *) ptr;
2299 BFD_ASSERT (abfd != NULL && ptr != NULL);
2301 /* xgettext:c-format */
2302 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2304 if (APCS_SET (abfd))
2306 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2307 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2309 if (APCS_FLOAT_FLAG (abfd))
2310 fprintf (file, _(" [floats passed in float registers]"));
2312 fprintf (file, _(" [floats passed in integer registers]"));
2314 if (PIC_FLAG (abfd))
2315 fprintf (file, _(" [position independent]"));
2317 fprintf (file, _(" [absolute position]"));
2320 if (! INTERWORK_SET (abfd))
2321 fprintf (file, _(" [interworking flag not initialised]"));
2322 else if (INTERWORK_FLAG (abfd))
2323 fprintf (file, _(" [interworking supported]"));
2325 fprintf (file, _(" [interworking not supported]"));
2332 /* Copies the given flags into the coff_tdata.flags field.
2333 Typically these flags come from the f_flags[] field of
2334 the COFF filehdr structure, which contains important,
2335 target specific information.
2336 Note: Although this function is static, it is explicitly
2337 called from both coffcode.h and peicode.h. */
2340 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2344 BFD_ASSERT (abfd != NULL);
2346 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2348 /* Make sure that the APCS field has not been initialised to the opposite
2351 && ( (APCS_26_FLAG (abfd) != flag)
2352 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2353 || (PIC_FLAG (abfd) != (flags & F_PIC))
2357 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2359 SET_APCS_FLAGS (abfd, flag);
2361 flag = (flags & F_INTERWORK);
2363 /* If the BFD has already had its interworking flag set, but it
2364 is different from the value that we have been asked to set,
2365 then assume that that merged code will not support interworking
2366 and set the flag accordingly. */
2367 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2370 /* xgettext: c-format */
2371 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2374 /* xgettext: c-format */
2375 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2380 SET_INTERWORK_FLAG (abfd, flag);
2385 /* Copy the important parts of the target specific data
2386 from one instance of a BFD to another. */
2389 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2391 BFD_ASSERT (src != NULL && dest != NULL);
2396 /* If the destination is not in the same format as the source, do not do
2398 if (src->xvec != dest->xvec)
2401 /* Copy the flags field. */
2404 if (APCS_SET (dest))
2406 /* If the src and dest have different APCS flag bits set, fail. */
2407 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2410 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2413 if (PIC_FLAG (dest) != PIC_FLAG (src))
2417 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2421 if (INTERWORK_SET (src))
2423 if (INTERWORK_SET (dest))
2425 /* If the src and dest have different interworking flags then turn
2426 off the interworking bit. */
2427 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2429 if (INTERWORK_FLAG (dest))
2431 /* xgettext:c-format */
2432 _bfd_error_handler (("\
2433 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2437 SET_INTERWORK_FLAG (dest, 0);
2442 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2449 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2450 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2451 #ifndef LOCAL_LABEL_PREFIX
2452 #define LOCAL_LABEL_PREFIX ""
2454 #ifndef USER_LABEL_PREFIX
2455 #define USER_LABEL_PREFIX "_"
2458 /* Like _bfd_coff_is_local_label_name, but
2459 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2461 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2462 labels of the form Lxxx to be stripped. */
2465 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2468 #ifdef USER_LABEL_PREFIX
2469 if (USER_LABEL_PREFIX[0] != 0)
2471 size_t len = strlen (USER_LABEL_PREFIX);
2473 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2478 #ifdef LOCAL_LABEL_PREFIX
2479 /* If there is a prefix for local labels then look for this.
2480 If the prefix exists, but it is empty, then ignore the test. */
2482 if (LOCAL_LABEL_PREFIX[0] != 0)
2484 size_t len = strlen (LOCAL_LABEL_PREFIX);
2486 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2489 /* Perform the checks below for the rest of the name. */
2494 return name[0] == 'L';
2497 /* This piece of machinery exists only to guarantee that the bfd that holds
2498 the glue section is written last.
2500 This does depend on bfd_make_section attaching a new section to the
2501 end of the section list for the bfd. */
2504 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2506 return (sub->output_has_begun
2507 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2511 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2512 struct coff_final_link_info * pfinfo)
2514 struct coff_arm_link_hash_table * globals;
2516 globals = coff_arm_hash_table (pfinfo->info);
2518 BFD_ASSERT (globals != NULL);
2520 if (globals->bfd_of_glue_owner != NULL)
2522 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2525 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2528 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2531 #include "coffcode.h"
2533 #ifndef TARGET_LITTLE_SYM
2534 #define TARGET_LITTLE_SYM armcoff_little_vec
2536 #ifndef TARGET_LITTLE_NAME
2537 #define TARGET_LITTLE_NAME "coff-arm-little"
2539 #ifndef TARGET_BIG_SYM
2540 #define TARGET_BIG_SYM armcoff_big_vec
2542 #ifndef TARGET_BIG_NAME
2543 #define TARGET_BIG_NAME "coff-arm-big"
2546 #ifndef TARGET_UNDERSCORE
2547 #define TARGET_UNDERSCORE 0
2550 #ifndef EXTRA_S_FLAGS
2552 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2554 #define EXTRA_S_FLAGS SEC_CODE
2558 /* Forward declaration for use initialising alternative_target field. */
2559 extern const bfd_target TARGET_BIG_SYM ;
2561 /* Target vectors. */
2562 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2563 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)