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;
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 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
858 #define COFF_PAGE_SIZE 0x1000
860 /* Turn a howto into a reloc nunmber. */
861 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
862 #define BADMAG(x) ARMBADMAG(x)
863 #define ARM 1 /* Customize coffcode.h. */
866 /* Make sure that the 'r_offset' field is copied properly
867 so that identical binaries will compare the same. */
868 #define SWAP_IN_RELOC_OFFSET H_GET_32
869 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
872 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
873 This allows us to store global data here without actually creating any
874 global variables, which is a no-no in the BFD world. */
875 struct coff_arm_link_hash_table
877 /* The original coff_link_hash_table structure. MUST be first field. */
878 struct coff_link_hash_table root;
880 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
881 bfd_size_type thumb_glue_size;
883 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
884 bfd_size_type arm_glue_size;
886 /* An arbitrary input BFD chosen to hold the glue sections. */
887 bfd * bfd_of_glue_owner;
889 /* Support interworking with old, non-interworking aware ARM code. */
890 int support_old_code;
893 /* Get the ARM coff linker hash table from a link_info structure. */
894 #define coff_arm_hash_table(info) \
895 ((struct coff_arm_link_hash_table *) ((info)->hash))
897 /* Create an ARM coff linker hash table. */
899 static struct bfd_link_hash_table *
900 coff_arm_link_hash_table_create (bfd * abfd)
902 struct coff_arm_link_hash_table * ret;
903 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
905 ret = bfd_malloc (amt);
909 if (!_bfd_coff_link_hash_table_init (&ret->root,
911 _bfd_coff_link_hash_newfunc,
912 sizeof (struct coff_link_hash_entry)))
918 ret->thumb_glue_size = 0;
919 ret->arm_glue_size = 0;
920 ret->bfd_of_glue_owner = NULL;
922 return & ret->root.root;
926 arm_emit_base_file_entry (struct bfd_link_info *info,
928 asection *input_section,
929 bfd_vma reloc_offset)
931 bfd_vma addr = reloc_offset
933 + input_section->output_offset
934 + input_section->output_section->vma;
936 if (coff_data (output_bfd)->pe)
937 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
938 fwrite (& addr, 1, sizeof (addr), (FILE *) info->base_file);
943 /* The thumb form of a long branch is a bit finicky, because the offset
944 encoding is split over two fields, each in it's own instruction. They
945 can occur in any order. So given a thumb form of long branch, and an
946 offset, insert the offset into the thumb branch and return finished
949 It takes two thumb instructions to encode the target address. Each has
950 11 bits to invest. The upper 11 bits are stored in one (identified by
951 H-0.. see below), the lower 11 bits are stored in the other (identified
954 Combine together and shifted left by 1 (it's a half word address) and
958 H-0, upper address-0 = 000
960 H-1, lower address-0 = 800
962 They can be ordered either way, but the arm tools I've seen always put
963 the lower one first. It probably doesn't matter. krk@cygnus.com
965 XXX: Actually the order does matter. The second instruction (H-1)
966 moves the computed address into the PC, so it must be the second one
967 in the sequence. The problem, however is that whilst little endian code
968 stores the instructions in HI then LOW order, big endian code does the
969 reverse. nickc@cygnus.com. */
971 #define LOW_HI_ORDER 0xF800F000
972 #define HI_LOW_ORDER 0xF000F800
975 insert_thumb_branch (insn32 br_insn, int rel_off)
977 unsigned int low_bits;
978 unsigned int high_bits;
980 BFD_ASSERT ((rel_off & 1) != 1);
982 rel_off >>= 1; /* Half word aligned address. */
983 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
984 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
986 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
987 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
988 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
989 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
991 /* FIXME: the BFD library should never abort except for internal errors
992 - it should return an error status. */
993 abort (); /* Error - not a valid branch instruction form. */
999 static struct coff_link_hash_entry *
1000 find_thumb_glue (struct bfd_link_info *info,
1005 struct coff_link_hash_entry *myh;
1006 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1008 tmp_name = bfd_malloc (amt);
1010 BFD_ASSERT (tmp_name);
1012 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1014 myh = coff_link_hash_lookup
1015 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1018 /* xgettext:c-format */
1019 _bfd_error_handler (_("%B: unable to find THUMB glue '%s' for `%s'"),
1020 input_bfd, tmp_name, name);
1026 #endif /* not ARM_WINCE */
1028 static struct coff_link_hash_entry *
1029 find_arm_glue (struct bfd_link_info *info,
1034 struct coff_link_hash_entry * myh;
1035 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1037 tmp_name = bfd_malloc (amt);
1039 BFD_ASSERT (tmp_name);
1041 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1043 myh = coff_link_hash_lookup
1044 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1047 /* xgettext:c-format */
1048 _bfd_error_handler (_("%B: unable to find ARM glue '%s' for `%s'"),
1049 input_bfd, tmp_name, name);
1061 ldr r12, __func_addr
1064 .word func @ behave as if you saw a ARM_32 reloc
1067 #define ARM2THUMB_GLUE_SIZE 12
1068 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1069 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1070 static const insn32 a2t3_func_addr_insn = 0x00000001;
1073 Thumb->ARM: Thumb->(non-interworking aware) ARM
1077 __func_from_thumb: __func_from_thumb:
1079 nop ldr r6, __func_addr
1081 __func_change_to_arm: bx r6
1083 __func_back_to_thumb:
1090 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1092 static const insn16 t2a1_bx_pc_insn = 0x4778;
1093 static const insn16 t2a2_noop_insn = 0x46c0;
1094 static const insn32 t2a3_b_insn = 0xea000000;
1096 static const insn16 t2a1_push_insn = 0xb540;
1097 static const insn16 t2a2_ldr_insn = 0x4e03;
1098 static const insn16 t2a3_mov_insn = 0x46fe;
1099 static const insn16 t2a4_bx_insn = 0x4730;
1100 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1101 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1105 We should really create new local (static) symbols in destination
1106 object for each stub we create. We should also create local
1107 (static) symbols within the stubs when switching between ARM and
1108 Thumb code. This will ensure that the debugger and disassembler
1109 can present a better view of stubs.
1111 We can treat stubs like literal sections, and for the THUMB9 ones
1112 (short addressing range) we should be able to insert the stubs
1113 between sections. i.e. the simplest approach (since relocations
1114 are done on a section basis) is to dump the stubs at the end of
1115 processing a section. That way we can always try and minimise the
1116 offset to and from a stub. However, this does not map well onto
1117 the way that the linker/BFD does its work: mapping all input
1118 sections to output sections via the linker script before doing
1121 Unfortunately it may be easier to just to disallow short range
1122 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1123 only branch-and-link (BL) calls. This will simplify the processing
1124 since we can then put all of the stubs into their own section.
1127 On a different subject, rather than complaining when a
1128 branch cannot fit in the number of bits available for the
1129 instruction we should generate a trampoline stub (needed to
1130 address the complete 32bit address space). */
1132 /* The standard COFF backend linker does not cope with the special
1133 Thumb BRANCH23 relocation. The alternative would be to split the
1134 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1135 bit simpler simply providing our own relocation driver. */
1137 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1138 This code is a very slightly modified copy of
1139 _bfd_coff_generic_relocate_section. It would be a much more
1140 maintainable solution to have a MACRO that could be expanded within
1141 _bfd_coff_generic_relocate_section that would only be provided for
1142 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1143 is different from the original. */
1146 coff_arm_relocate_section (bfd *output_bfd,
1147 struct bfd_link_info *info,
1149 asection *input_section,
1151 struct internal_reloc *relocs,
1152 struct internal_syment *syms,
1153 asection **sections)
1155 struct internal_reloc * rel;
1156 struct internal_reloc * relend;
1158 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1162 relend = rel + input_section->reloc_count;
1164 for (; rel < relend; rel++)
1168 struct coff_link_hash_entry * h;
1169 struct internal_syment * sym;
1172 reloc_howto_type * howto;
1173 bfd_reloc_status_type rstat;
1176 symndx = rel->r_symndx;
1185 h = obj_coff_sym_hashes (input_bfd)[symndx];
1186 sym = syms + symndx;
1189 /* COFF treats common symbols in one of two ways. Either the
1190 size of the symbol is included in the section contents, or it
1191 is not. We assume that the size is not included, and force
1192 the rtype_to_howto function to adjust the addend as needed. */
1194 if (sym != NULL && sym->n_scnum != 0)
1195 addend = - sym->n_value;
1199 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1204 /* The relocation_section function will skip pcrel_offset relocs
1205 when doing a relocatable link. However, we want to convert
1206 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1207 this case without pcrel_offset set, and adjust the addend to
1208 compensate. 'partial_inplace' is also set, since we want 'done'
1209 relocations to be reflected in section's data. */
1210 if (rel->r_type == ARM_26
1212 && info->relocatable
1213 && (h->root.type == bfd_link_hash_defined
1214 || h->root.type == bfd_link_hash_defweak)
1215 && (h->root.u.def.section->output_section
1216 == input_section->output_section))
1218 static reloc_howto_type fake_arm26_reloc =
1225 complain_overflow_signed,
1226 aoutarm_fix_pcrel_26 ,
1233 addend -= rel->r_vaddr - input_section->vma;
1235 /* FIXME: I don't know why, but the hack is necessary for correct
1236 generation of bl's instruction offset. */
1239 howto = & fake_arm26_reloc;
1243 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1244 the next opcode's pc, so is off by one. */
1245 if (howto->pc_relative && !info->relocatable)
1249 /* If we are doing a relocatable link, then we can just ignore
1250 a PC relative reloc that is pcrel_offset. It will already
1251 have the correct value. If this is not a relocatable link,
1252 then we should ignore the symbol value. */
1253 if (howto->pc_relative && howto->pcrel_offset)
1255 if (info->relocatable)
1257 /* FIXME - it is not clear which targets need this next test
1258 and which do not. It is known that it is needed for the
1259 VxWorks and EPOC-PE targets, but it is also known that it
1260 was suppressed for other ARM targets. This ought to be
1261 sorted out one day. */
1262 #ifdef ARM_COFF_BUGFIX
1263 /* We must not ignore the symbol value. If the symbol is
1264 within the same section, the relocation should have already
1265 been fixed, but if it is not, we'll be handed a reloc into
1266 the beginning of the symbol's section, so we must not cancel
1267 out the symbol's value, otherwise we'll be adding it in
1269 if (sym != NULL && sym->n_scnum != 0)
1270 addend += sym->n_value;
1282 sec = bfd_abs_section_ptr;
1287 sec = sections[symndx];
1288 val = (sec->output_section->vma
1289 + sec->output_offset
1296 /* We don't output the stubs if we are generating a
1297 relocatable output file, since we may as well leave the
1298 stub generation to the final linker pass. If we fail to
1299 verify that the name is defined, we'll try to build stubs
1300 for an undefined name... */
1301 if (! info->relocatable
1302 && ( h->root.type == bfd_link_hash_defined
1303 || h->root.type == bfd_link_hash_defweak))
1305 asection * h_sec = h->root.u.def.section;
1306 const char * name = h->root.root.string;
1308 /* h locates the symbol referenced in the reloc. */
1309 h_val = (h->root.u.def.value
1310 + h_sec->output_section->vma
1311 + h_sec->output_offset);
1313 if (howto->type == ARM_26)
1315 if ( h->class == C_THUMBSTATFUNC
1316 || h->class == C_THUMBEXTFUNC)
1318 /* Arm code calling a Thumb function. */
1319 unsigned long int tmp;
1322 long int ret_offset;
1323 struct coff_link_hash_entry * myh;
1324 struct coff_arm_link_hash_table * globals;
1326 myh = find_arm_glue (info, name, input_bfd);
1330 globals = coff_arm_hash_table (info);
1332 BFD_ASSERT (globals != NULL);
1333 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1335 my_offset = myh->root.u.def.value;
1337 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1338 ARM2THUMB_GLUE_SECTION_NAME);
1339 BFD_ASSERT (s != NULL);
1340 BFD_ASSERT (s->contents != NULL);
1341 BFD_ASSERT (s->output_section != NULL);
1343 if ((my_offset & 0x01) == 0x01)
1345 if (h_sec->owner != NULL
1346 && INTERWORK_SET (h_sec->owner)
1347 && ! INTERWORK_FLAG (h_sec->owner))
1349 /* xgettext:c-format */
1350 (_("%B(%s): warning: interworking not enabled.\n"
1351 " first occurrence: %B: arm call to thumb"),
1352 h_sec->owner, input_bfd, name);
1355 myh->root.u.def.value = my_offset;
1357 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1358 s->contents + my_offset);
1360 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1361 s->contents + my_offset + 4);
1363 /* It's a thumb address. Add the low order bit. */
1364 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1365 s->contents + my_offset + 8);
1367 if (info->base_file)
1368 arm_emit_base_file_entry (info, output_bfd, s,
1373 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1375 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1376 - input_section->vma);
1378 tmp = tmp & 0xFF000000;
1380 /* Somehow these are both 4 too far, so subtract 8. */
1384 + s->output_section->vma
1385 - (input_section->output_offset
1386 + input_section->output_section->vma
1390 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1392 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1393 contents + rel->r_vaddr - input_section->vma);
1399 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1400 else if (howto->type == ARM_THUMB23)
1402 if ( h->class == C_EXT
1403 || h->class == C_STAT
1404 || h->class == C_LABEL)
1406 /* Thumb code calling an ARM function. */
1409 unsigned long int tmp;
1410 long int ret_offset;
1411 struct coff_link_hash_entry * myh;
1412 struct coff_arm_link_hash_table * globals;
1414 myh = find_thumb_glue (info, name, input_bfd);
1418 globals = coff_arm_hash_table (info);
1420 BFD_ASSERT (globals != NULL);
1421 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1423 my_offset = myh->root.u.def.value;
1425 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1426 THUMB2ARM_GLUE_SECTION_NAME);
1428 BFD_ASSERT (s != NULL);
1429 BFD_ASSERT (s->contents != NULL);
1430 BFD_ASSERT (s->output_section != NULL);
1432 if ((my_offset & 0x01) == 0x01)
1434 if (h_sec->owner != NULL
1435 && INTERWORK_SET (h_sec->owner)
1436 && ! INTERWORK_FLAG (h_sec->owner)
1437 && ! globals->support_old_code)
1439 /* xgettext:c-format */
1440 (_("%B(%s): warning: interworking not enabled.\n"
1441 " first occurrence: %B: thumb call to arm\n"
1442 " consider relinking with --support-old-code enabled"),
1443 h_sec->owner, input_bfd, name);
1446 myh->root.u.def.value = my_offset;
1448 if (globals->support_old_code)
1450 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1451 s->contents + my_offset);
1453 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1454 s->contents + my_offset + 2);
1456 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1457 s->contents + my_offset + 4);
1459 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1460 s->contents + my_offset + 6);
1462 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1463 s->contents + my_offset + 8);
1465 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1466 s->contents + my_offset + 12);
1468 /* Store the address of the function in the last word of the stub. */
1469 bfd_put_32 (output_bfd, h_val,
1470 s->contents + my_offset + 16);
1472 if (info->base_file)
1473 arm_emit_base_file_entry (info, output_bfd, s,
1478 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1479 s->contents + my_offset);
1481 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1482 s->contents + my_offset + 2);
1485 /* Address of destination of the stub. */
1486 ((bfd_signed_vma) h_val)
1488 /* Offset from the start of the current section to the start of the stubs. */
1490 /* Offset of the start of this stub from the start of the stubs. */
1492 /* Address of the start of the current section. */
1493 + s->output_section->vma)
1494 /* The branch instruction is 4 bytes into the stub. */
1496 /* ARM branches work from the pc of the instruction + 8. */
1499 bfd_put_32 (output_bfd,
1500 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1501 s->contents + my_offset + 4);
1506 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1508 /* Now go back and fix up the original BL insn to point
1513 - (input_section->output_offset
1517 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1518 - input_section->vma);
1520 bfd_put_32 (output_bfd,
1521 (bfd_vma) insert_thumb_branch (tmp,
1523 contents + rel->r_vaddr - input_section->vma);
1531 /* If the relocation type and destination symbol does not
1532 fall into one of the above categories, then we can just
1533 perform a direct link. */
1536 rstat = bfd_reloc_ok;
1538 if ( h->root.type == bfd_link_hash_defined
1539 || h->root.type == bfd_link_hash_defweak)
1543 sec = h->root.u.def.section;
1544 val = (h->root.u.def.value
1545 + sec->output_section->vma
1546 + sec->output_offset);
1549 else if (! info->relocatable)
1551 if (! ((*info->callbacks->undefined_symbol)
1552 (info, h->root.root.string, input_bfd, input_section,
1553 rel->r_vaddr - input_section->vma, TRUE)))
1558 if (info->base_file)
1560 /* Emit a reloc if the backend thinks it needs it. */
1561 if (sym && pe_data(output_bfd)->in_reloc_p(output_bfd, howto))
1562 arm_emit_base_file_entry (info, output_bfd, input_section,
1567 rstat = bfd_reloc_ok;
1569 /* Only perform this fix during the final link, not a relocatable link. */
1570 else if (! info->relocatable
1571 && howto->type == ARM_THUMB23)
1573 /* This is pretty much a copy of what the default
1574 _bfd_final_link_relocate and _bfd_relocate_contents
1575 routines do to perform a relocation, with special
1576 processing for the split addressing of the Thumb BL
1577 instruction. Again, it would probably be simpler adding a
1578 ThumbBRANCH23 specific macro expansion into the default
1581 bfd_vma address = rel->r_vaddr - input_section->vma;
1583 if (address > high_address)
1584 rstat = bfd_reloc_outofrange;
1587 bfd_vma relocation = val + addend;
1588 int size = bfd_get_reloc_size (howto);
1589 bfd_boolean overflow = FALSE;
1590 bfd_byte *location = contents + address;
1591 bfd_vma x = bfd_get_32 (input_bfd, location);
1592 bfd_vma src_mask = 0x007FFFFE;
1593 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1594 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1596 bfd_signed_vma signed_check;
1598 bfd_signed_vma signed_add;
1600 BFD_ASSERT (size == 4);
1602 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1603 relocation -= (input_section->output_section->vma
1604 + input_section->output_offset);
1606 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1607 relocation -= address;
1609 /* No need to negate the relocation with BRANCH23. */
1610 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1611 /* howto->rightshift == 1 */
1613 /* Drop unwanted bits from the value we are relocating to. */
1614 check = relocation >> howto->rightshift;
1616 /* If this is a signed value, the rightshift just dropped
1617 leading 1 bits (assuming twos complement). */
1618 if ((bfd_signed_vma) relocation >= 0)
1619 signed_check = check;
1621 signed_check = (check
1623 & ~((bfd_vma) - 1 >> howto->rightshift)));
1625 /* Get the value from the object file. */
1626 if (bfd_big_endian (input_bfd))
1627 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1629 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1631 /* Get the value from the object file with an appropriate sign.
1632 The expression involving howto->src_mask isolates the upper
1633 bit of src_mask. If that bit is set in the value we are
1634 adding, it is negative, and we subtract out that number times
1635 two. If src_mask includes the highest possible bit, then we
1636 can not get the upper bit, but that does not matter since
1637 signed_add needs no adjustment to become negative in that
1641 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1642 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1644 /* howto->bitpos == 0 */
1645 /* Add the value from the object file, shifted so that it is a
1647 signed_check += signed_add;
1648 relocation += signed_add;
1650 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1652 /* Assumes two's complement. */
1653 if ( signed_check > reloc_signed_max
1654 || signed_check < reloc_signed_min)
1657 /* Put the relocation into the correct bits.
1658 For a BLX instruction, make sure that the relocation is rounded up
1659 to a word boundary. This follows the semantics of the instruction
1660 which specifies that bit 1 of the target address will come from bit
1661 1 of the base address. */
1662 if (bfd_big_endian (input_bfd))
1664 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1666 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1670 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1672 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1675 /* Add the relocation to the correct bits of X. */
1676 x = ((x & ~howto->dst_mask) | relocation);
1678 /* Put the relocated value back in the object file. */
1679 bfd_put_32 (input_bfd, x, location);
1681 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1686 if (info->relocatable && ! howto->partial_inplace)
1687 rstat = bfd_reloc_ok;
1689 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1691 rel->r_vaddr - input_section->vma,
1693 /* Only perform this fix during the final link, not a relocatable link. */
1694 if (! info->relocatable
1695 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1697 /* Determine if we need to set the bottom bit of a relocated address
1698 because the address is the address of a Thumb code symbol. */
1699 int patchit = FALSE;
1702 && ( h->class == C_THUMBSTATFUNC
1703 || h->class == C_THUMBEXTFUNC))
1707 else if (sym != NULL
1708 && sym->n_scnum > N_UNDEF)
1710 /* No hash entry - use the symbol instead. */
1711 if ( sym->n_sclass == C_THUMBSTATFUNC
1712 || sym->n_sclass == C_THUMBEXTFUNC)
1718 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1719 bfd_vma x = bfd_get_32 (input_bfd, location);
1721 bfd_put_32 (input_bfd, x | 1, location);
1731 case bfd_reloc_outofrange:
1732 (*_bfd_error_handler)
1733 (_("%B: bad reloc address 0x%lx in section `%A'"),
1734 input_bfd, input_section, (unsigned long) rel->r_vaddr);
1736 case bfd_reloc_overflow:
1739 char buf[SYMNMLEN + 1];
1747 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1752 if (! ((*info->callbacks->reloc_overflow)
1753 (info, (h ? &h->root : NULL), name, howto->name,
1754 (bfd_vma) 0, input_bfd, input_section,
1755 rel->r_vaddr - input_section->vma)))
1764 #ifndef COFF_IMAGE_WITH_PE
1767 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1771 struct coff_arm_link_hash_table * globals;
1773 globals = coff_arm_hash_table (info);
1775 BFD_ASSERT (globals != NULL);
1777 if (globals->arm_glue_size != 0)
1779 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1781 s = bfd_get_section_by_name
1782 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1784 BFD_ASSERT (s != NULL);
1786 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1788 s->size = globals->arm_glue_size;
1792 if (globals->thumb_glue_size != 0)
1794 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1796 s = bfd_get_section_by_name
1797 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1799 BFD_ASSERT (s != NULL);
1801 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1803 s->size = globals->thumb_glue_size;
1811 record_arm_to_thumb_glue (struct bfd_link_info * info,
1812 struct coff_link_hash_entry * h)
1814 const char * name = h->root.root.string;
1815 register asection * s;
1817 struct coff_link_hash_entry * myh;
1818 struct bfd_link_hash_entry * bh;
1819 struct coff_arm_link_hash_table * globals;
1823 globals = coff_arm_hash_table (info);
1825 BFD_ASSERT (globals != NULL);
1826 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1828 s = bfd_get_section_by_name
1829 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1831 BFD_ASSERT (s != NULL);
1833 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1834 tmp_name = bfd_malloc (amt);
1836 BFD_ASSERT (tmp_name);
1838 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1840 myh = coff_link_hash_lookup
1841 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1846 /* We've already seen this guy. */
1850 /* The only trick here is using globals->arm_glue_size as the value. Even
1851 though the section isn't allocated yet, this is where we will be putting
1854 val = globals->arm_glue_size + 1;
1855 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1856 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1860 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1867 record_thumb_to_arm_glue (struct bfd_link_info * info,
1868 struct coff_link_hash_entry * h)
1870 const char * name = h->root.root.string;
1873 struct coff_link_hash_entry * myh;
1874 struct bfd_link_hash_entry * bh;
1875 struct coff_arm_link_hash_table * globals;
1879 globals = coff_arm_hash_table (info);
1881 BFD_ASSERT (globals != NULL);
1882 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1884 s = bfd_get_section_by_name
1885 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1887 BFD_ASSERT (s != NULL);
1889 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1890 tmp_name = bfd_malloc (amt);
1892 BFD_ASSERT (tmp_name);
1894 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1896 myh = coff_link_hash_lookup
1897 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1902 /* We've already seen this guy. */
1907 val = globals->thumb_glue_size + 1;
1908 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1909 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1911 /* If we mark it 'thumb', the disassembler will do a better job. */
1912 myh = (struct coff_link_hash_entry *) bh;
1913 myh->class = C_THUMBEXTFUNC;
1917 /* Allocate another symbol to mark where we switch to arm mode. */
1919 #define CHANGE_TO_ARM "__%s_change_to_arm"
1920 #define BACK_FROM_ARM "__%s_back_from_arm"
1922 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1923 tmp_name = bfd_malloc (amt);
1925 BFD_ASSERT (tmp_name);
1927 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1930 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1931 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1932 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1936 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1940 #endif /* not ARM_WINCE */
1942 /* Select a BFD to be used to hold the sections used by the glue code.
1943 This function is called from the linker scripts in ld/emultempl/
1947 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1948 struct bfd_link_info * info)
1950 struct coff_arm_link_hash_table * globals;
1954 /* If we are only performing a partial link do not bother
1955 getting a bfd to hold the glue. */
1956 if (info->relocatable)
1959 globals = coff_arm_hash_table (info);
1961 BFD_ASSERT (globals != NULL);
1963 if (globals->bfd_of_glue_owner != NULL)
1966 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1970 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1971 | SEC_CODE | SEC_READONLY);
1972 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1975 || ! bfd_set_section_alignment (abfd, sec, 2))
1979 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
1983 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1984 | SEC_CODE | SEC_READONLY);
1985 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
1989 || ! bfd_set_section_alignment (abfd, sec, 2))
1993 /* Save the bfd for later use. */
1994 globals->bfd_of_glue_owner = abfd;
2000 bfd_arm_process_before_allocation (bfd * abfd,
2001 struct bfd_link_info * info,
2002 int support_old_code)
2005 struct coff_arm_link_hash_table * globals;
2007 /* If we are only performing a partial link do not bother
2008 to construct any glue. */
2009 if (info->relocatable)
2012 /* Here we have a bfd that is to be included on the link. We have a hook
2013 to do reloc rummaging, before section sizes are nailed down. */
2014 _bfd_coff_get_external_symbols (abfd);
2016 globals = coff_arm_hash_table (info);
2018 BFD_ASSERT (globals != NULL);
2019 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2021 globals->support_old_code = support_old_code;
2023 /* Rummage around all the relocs and map the glue vectors. */
2024 sec = abfd->sections;
2029 for (; sec != NULL; sec = sec->next)
2031 struct internal_reloc * i;
2032 struct internal_reloc * rel;
2034 if (sec->reloc_count == 0)
2037 /* Load the relocs. */
2038 /* FIXME: there may be a storage leak here. */
2039 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2041 BFD_ASSERT (i != 0);
2043 for (rel = i; rel < i + sec->reloc_count; ++rel)
2045 unsigned short r_type = rel->r_type;
2047 struct coff_link_hash_entry * h;
2049 symndx = rel->r_symndx;
2051 /* If the relocation is not against a symbol it cannot concern us. */
2055 /* If the index is outside of the range of our table, something has gone wrong. */
2056 if (symndx >= obj_conv_table_size (abfd))
2058 _bfd_error_handler (_("%B: illegal symbol index in reloc: %d"),
2063 h = obj_coff_sym_hashes (abfd)[symndx];
2065 /* If the relocation is against a static symbol it must be within
2066 the current section and so cannot be a cross ARM/Thumb relocation. */
2073 /* This one is a call from arm code. We need to look up
2074 the target of the call. If it is a thumb target, we
2077 if (h->class == C_THUMBEXTFUNC)
2078 record_arm_to_thumb_glue (info, h);
2083 /* This one is a call from thumb code. We used to look
2084 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2085 up the target of the call. If it is an arm target, we
2086 insert glue. If the symbol does not exist it will be
2087 given a class of C_EXT and so we will generate a stub
2088 for it. This is not really a problem, since the link
2089 is doomed anyway. */
2096 record_thumb_to_arm_glue (info, h);
2113 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2115 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2116 #define coff_relocate_section coff_arm_relocate_section
2117 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2118 #define coff_adjust_symndx coff_arm_adjust_symndx
2119 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2120 #define coff_final_link_postscript coff_arm_final_link_postscript
2121 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2122 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2123 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2124 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2125 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2127 /* When doing a relocatable link, we want to convert ARM_26 relocs
2128 into ARM_26D relocs. */
2131 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2132 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2135 struct internal_reloc *irel,
2136 bfd_boolean *adjustedp)
2138 if (irel->r_type == ARM_26)
2140 struct coff_link_hash_entry *h;
2142 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2144 && (h->root.type == bfd_link_hash_defined
2145 || h->root.type == bfd_link_hash_defweak)
2146 && h->root.u.def.section->output_section == sec->output_section)
2147 irel->r_type = ARM_26D;
2153 /* Called when merging the private data areas of two BFDs.
2154 This is important as it allows us to detect if we are
2155 attempting to merge binaries compiled for different ARM
2156 targets, eg different CPUs or different APCS's. */
2159 coff_arm_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
2161 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2166 /* If the two formats are different we cannot merge anything.
2167 This is not an error, since it is permissable to change the
2168 input and output formats. */
2169 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2170 || obfd->xvec->flavour != bfd_target_coff_flavour)
2173 /* Determine what should happen if the input ARM architecture
2174 does not match the output ARM architecture. */
2175 if (! bfd_arm_merge_machines (ibfd, obfd))
2178 /* Verify that the APCS is the same for the two BFDs. */
2179 if (APCS_SET (ibfd))
2181 if (APCS_SET (obfd))
2183 /* If the src and dest have different APCS flag bits set, fail. */
2184 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2187 /* xgettext: c-format */
2188 (_("ERROR: %B is compiled for APCS-%d, whereas %B is compiled for APCS-%d"),
2190 APCS_26_FLAG (ibfd) ? 26 : 32,
2191 APCS_26_FLAG (obfd) ? 26 : 32
2194 bfd_set_error (bfd_error_wrong_format);
2198 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2202 if (APCS_FLOAT_FLAG (ibfd))
2203 /* xgettext: c-format */
2204 msg = _("ERROR: %B passes floats in float registers, whereas %B passes them in integer registers");
2206 /* xgettext: c-format */
2207 msg = _("ERROR: %B passes floats in integer registers, whereas %B passes them in float registers");
2209 _bfd_error_handler (msg, ibfd, obfd);
2211 bfd_set_error (bfd_error_wrong_format);
2215 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2219 if (PIC_FLAG (ibfd))
2220 /* xgettext: c-format */
2221 msg = _("ERROR: %B is compiled as position independent code, whereas target %B is absolute position");
2223 /* xgettext: c-format */
2224 msg = _("ERROR: %B is compiled as absolute position code, whereas target %B is position independent");
2225 _bfd_error_handler (msg, ibfd, obfd);
2227 bfd_set_error (bfd_error_wrong_format);
2233 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2235 /* Set up the arch and fields as well as these are probably wrong. */
2236 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2240 /* Check the interworking support. */
2241 if (INTERWORK_SET (ibfd))
2243 if (INTERWORK_SET (obfd))
2245 /* If the src and dest differ in their interworking issue a warning. */
2246 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2250 if (INTERWORK_FLAG (ibfd))
2251 /* xgettext: c-format */
2252 msg = _("Warning: %B supports interworking, whereas %B does not");
2254 /* xgettext: c-format */
2255 msg = _("Warning: %B does not support interworking, whereas %B does");
2257 _bfd_error_handler (msg, ibfd, obfd);
2262 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2269 /* Display the flags field. */
2272 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2274 FILE * file = (FILE *) ptr;
2276 BFD_ASSERT (abfd != NULL && ptr != NULL);
2278 /* xgettext:c-format */
2279 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2281 if (APCS_SET (abfd))
2283 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2284 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2286 if (APCS_FLOAT_FLAG (abfd))
2287 fprintf (file, _(" [floats passed in float registers]"));
2289 fprintf (file, _(" [floats passed in integer registers]"));
2291 if (PIC_FLAG (abfd))
2292 fprintf (file, _(" [position independent]"));
2294 fprintf (file, _(" [absolute position]"));
2297 if (! INTERWORK_SET (abfd))
2298 fprintf (file, _(" [interworking flag not initialised]"));
2299 else if (INTERWORK_FLAG (abfd))
2300 fprintf (file, _(" [interworking supported]"));
2302 fprintf (file, _(" [interworking not supported]"));
2309 /* Copies the given flags into the coff_tdata.flags field.
2310 Typically these flags come from the f_flags[] field of
2311 the COFF filehdr structure, which contains important,
2312 target specific information.
2313 Note: Although this function is static, it is explicitly
2314 called from both coffcode.h and peicode.h. */
2317 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2321 BFD_ASSERT (abfd != NULL);
2323 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2325 /* Make sure that the APCS field has not been initialised to the opposite
2328 && ( (APCS_26_FLAG (abfd) != flag)
2329 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2330 || (PIC_FLAG (abfd) != (flags & F_PIC))
2334 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2336 SET_APCS_FLAGS (abfd, flag);
2338 flag = (flags & F_INTERWORK);
2340 /* If the BFD has already had its interworking flag set, but it
2341 is different from the value that we have been asked to set,
2342 then assume that that merged code will not support interworking
2343 and set the flag accordingly. */
2344 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2347 /* xgettext: c-format */
2348 _bfd_error_handler (_("Warning: Not setting interworking flag of %B since it has already been specified as non-interworking"),
2351 /* xgettext: c-format */
2352 _bfd_error_handler (_("Warning: Clearing the interworking flag of %B due to outside request"),
2357 SET_INTERWORK_FLAG (abfd, flag);
2362 /* Copy the important parts of the target specific data
2363 from one instance of a BFD to another. */
2366 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2368 BFD_ASSERT (src != NULL && dest != NULL);
2373 /* If the destination is not in the same format as the source, do not do
2375 if (src->xvec != dest->xvec)
2378 /* Copy the flags field. */
2381 if (APCS_SET (dest))
2383 /* If the src and dest have different APCS flag bits set, fail. */
2384 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2387 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2390 if (PIC_FLAG (dest) != PIC_FLAG (src))
2394 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2398 if (INTERWORK_SET (src))
2400 if (INTERWORK_SET (dest))
2402 /* If the src and dest have different interworking flags then turn
2403 off the interworking bit. */
2404 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2406 if (INTERWORK_FLAG (dest))
2408 /* xgettext:c-format */
2409 _bfd_error_handler (("\
2410 Warning: Clearing the interworking flag of %B because non-interworking code in %B has been linked with it"),
2414 SET_INTERWORK_FLAG (dest, 0);
2419 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2426 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2427 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2428 #define LOCAL_LABEL_PREFIX ""
2429 #ifndef USER_LABEL_PREFIX
2430 #define USER_LABEL_PREFIX "_"
2433 /* Like _bfd_coff_is_local_label_name, but
2434 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2436 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2437 labels of the form Lxxx to be stripped. */
2440 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2443 #ifdef USER_LABEL_PREFIX
2444 if (USER_LABEL_PREFIX[0] != 0)
2446 size_t len = strlen (USER_LABEL_PREFIX);
2448 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2453 #ifdef LOCAL_LABEL_PREFIX
2454 /* If there is a prefix for local labels then look for this.
2455 If the prefix exists, but it is empty, then ignore the test. */
2457 if (LOCAL_LABEL_PREFIX[0] != 0)
2459 size_t len = strlen (LOCAL_LABEL_PREFIX);
2461 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2464 /* Perform the checks below for the rest of the name. */
2469 return name[0] == 'L';
2472 /* This piece of machinery exists only to guarantee that the bfd that holds
2473 the glue section is written last.
2475 This does depend on bfd_make_section attaching a new section to the
2476 end of the section list for the bfd. */
2479 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2481 return (sub->output_has_begun
2482 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2486 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2487 struct coff_final_link_info * pfinfo)
2489 struct coff_arm_link_hash_table * globals;
2491 globals = coff_arm_hash_table (pfinfo->info);
2493 BFD_ASSERT (globals != NULL);
2495 if (globals->bfd_of_glue_owner != NULL)
2497 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2500 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2503 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2506 #include "coffcode.h"
2508 #ifndef TARGET_LITTLE_SYM
2509 #define TARGET_LITTLE_SYM armcoff_little_vec
2511 #ifndef TARGET_LITTLE_NAME
2512 #define TARGET_LITTLE_NAME "coff-arm-little"
2514 #ifndef TARGET_BIG_SYM
2515 #define TARGET_BIG_SYM armcoff_big_vec
2517 #ifndef TARGET_BIG_NAME
2518 #define TARGET_BIG_NAME "coff-arm-big"
2521 #ifndef TARGET_UNDERSCORE
2522 #define TARGET_UNDERSCORE 0
2525 #ifndef EXTRA_S_FLAGS
2527 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2529 #define EXTRA_S_FLAGS SEC_CODE
2533 /* Forward declaration for use initialising alternative_target field. */
2534 extern const bfd_target TARGET_BIG_SYM ;
2536 /* Target vectors. */
2537 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2538 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)