1 /* BFD back-end for ARM COFF files.
2 Copyright (C) 1990-2019 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
26 #include "coff/internal.h"
34 /* Macros for manipulation the bits in the flags field of the coff data
36 #define APCS_26_FLAG(abfd) \
37 (coff_data (abfd)->flags & F_APCS_26)
39 #define APCS_FLOAT_FLAG(abfd) \
40 (coff_data (abfd)->flags & F_APCS_FLOAT)
42 #define PIC_FLAG(abfd) \
43 (coff_data (abfd)->flags & F_PIC)
45 #define APCS_SET(abfd) \
46 (coff_data (abfd)->flags & F_APCS_SET)
48 #define SET_APCS_FLAGS(abfd, flgs) \
51 coff_data (abfd)->flags &= ~(F_APCS_26 | F_APCS_FLOAT | F_PIC); \
52 coff_data (abfd)->flags |= (flgs) | F_APCS_SET; \
56 #define INTERWORK_FLAG(abfd) \
57 (coff_data (abfd)->flags & F_INTERWORK)
59 #define INTERWORK_SET(abfd) \
60 (coff_data (abfd)->flags & F_INTERWORK_SET)
62 #define SET_INTERWORK_FLAG(abfd, flg) \
65 coff_data (abfd)->flags &= ~F_INTERWORK; \
66 coff_data (abfd)->flags |= (flg) | F_INTERWORK_SET; \
71 #define NUM_ELEM(a) ((sizeof (a)) / sizeof ((a)[0]))
74 typedef enum {bunknown, b9, b12, b23} thumb_pcrel_branchtype;
75 /* Some typedefs for holding instructions. */
76 typedef unsigned long int insn32;
77 typedef unsigned short int insn16;
79 /* The linker script knows the section names for placement.
80 The entry_names are used to do simple name mangling on the stubs.
81 Given a function name, and its type, the stub can be found. The
82 name can be changed. The only requirement is the %s be present. */
84 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
85 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
87 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
88 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
90 /* Used by the assembler. */
92 static bfd_reloc_status_type
93 coff_arm_reloc (bfd *abfd,
95 asymbol *symbol ATTRIBUTE_UNUSED,
97 asection *input_section ATTRIBUTE_UNUSED,
99 char **error_message ATTRIBUTE_UNUSED)
103 if (output_bfd == NULL)
104 return bfd_reloc_continue;
106 diff = reloc_entry->addend;
109 x = ((x & ~howto->dst_mask) \
110 | (((x & howto->src_mask) + diff) & howto->dst_mask))
114 reloc_howto_type *howto = reloc_entry->howto;
115 unsigned char *addr = (unsigned char *) data + reloc_entry->address;
117 if (! bfd_reloc_offset_in_range (howto, abfd, input_section,
119 * bfd_octets_per_byte (abfd)))
120 return bfd_reloc_outofrange;
126 char x = bfd_get_8 (abfd, addr);
128 bfd_put_8 (abfd, x, addr);
134 short x = bfd_get_16 (abfd, addr);
136 bfd_put_16 (abfd, (bfd_vma) x, addr);
142 long x = bfd_get_32 (abfd, addr);
144 bfd_put_32 (abfd, (bfd_vma) x, addr);
153 /* Now let bfd_perform_relocation finish everything up. */
154 return bfd_reloc_continue;
157 /* If USER_LABEL_PREFIX is defined as "_" (see coff_arm_is_local_label_name()
158 in this file), then TARGET_UNDERSCORE should be defined, otherwise it
160 #ifndef TARGET_UNDERSCORE
161 #define TARGET_UNDERSCORE '_'
165 #define PCRELOFFSET TRUE
168 /* These most certainly belong somewhere else. Just had to get rid of
169 the manifest constants in the code. */
177 #define ARM_THUMB12 4
178 #define ARM_SECTION 14
179 #define ARM_SECREL 15
195 #define ARM_THUMB9 12
196 #define ARM_THUMB12 13
197 #define ARM_THUMB23 14
201 static bfd_reloc_status_type aoutarm_fix_pcrel_26_done
202 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
203 static bfd_reloc_status_type aoutarm_fix_pcrel_26
204 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
205 static bfd_reloc_status_type coff_thumb_pcrel_12
206 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
208 static bfd_reloc_status_type coff_thumb_pcrel_9
209 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
210 static bfd_reloc_status_type coff_thumb_pcrel_23
211 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
214 static reloc_howto_type aoutarm_std_reloc_howto[] =
223 complain_overflow_dont,
224 aoutarm_fix_pcrel_26_done,
226 TRUE, /* partial_inplace. */
236 complain_overflow_bitfield,
239 TRUE, /* partial_inplace. */
249 complain_overflow_bitfield,
252 TRUE, /* partial_inplace. */
262 complain_overflow_signed,
263 aoutarm_fix_pcrel_26 ,
275 complain_overflow_signed,
276 coff_thumb_pcrel_12 ,
297 complain_overflow_bitfield,
300 TRUE, /* partial_inplace. */
310 complain_overflow_bitfield,
313 TRUE, /* partial_inplace. */
317 #else /* not ARM_WINCE */
324 complain_overflow_bitfield,
337 complain_overflow_bitfield,
350 complain_overflow_bitfield,
363 complain_overflow_signed,
364 aoutarm_fix_pcrel_26 ,
376 complain_overflow_signed,
389 complain_overflow_signed,
402 complain_overflow_signed,
415 complain_overflow_dont,
416 aoutarm_fix_pcrel_26_done,
430 complain_overflow_bitfield,
443 complain_overflow_bitfield,
456 complain_overflow_bitfield,
469 complain_overflow_signed,
482 complain_overflow_signed,
483 coff_thumb_pcrel_12 ,
495 complain_overflow_signed,
496 coff_thumb_pcrel_23 ,
502 #endif /* not ARM_WINCE */
505 #define NUM_RELOCS NUM_ELEM (aoutarm_std_reloc_howto)
508 /* Return TRUE if this relocation should
509 appear in the output .reloc section. */
512 in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED,
513 reloc_howto_type * howto)
515 return !howto->pc_relative && howto->type != ARM_RVA32;
519 #define RTYPE2HOWTO(cache_ptr, dst) \
520 (cache_ptr)->howto = \
521 (dst)->r_type < NUM_RELOCS \
522 ? aoutarm_std_reloc_howto + (dst)->r_type \
525 #define coff_rtype_to_howto coff_arm_rtype_to_howto
527 static reloc_howto_type *
528 coff_arm_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
530 struct internal_reloc *rel,
531 struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
532 struct internal_syment *sym ATTRIBUTE_UNUSED,
535 reloc_howto_type * howto;
537 if (rel->r_type >= NUM_RELOCS)
540 howto = aoutarm_std_reloc_howto + rel->r_type;
542 if (rel->r_type == ARM_RVA32)
543 *addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase;
545 #if defined COFF_WITH_PE && defined ARM_WINCE
546 if (rel->r_type == ARM_SECREL)
550 if (h && (h->type == bfd_link_hash_defined
551 || h->type == bfd_link_hash_defweak))
552 osect_vma = h->root.u.def.section->output_section->vma;
557 /* Sigh, the only way to get the section to offset against
558 is to find it the hard way. */
560 for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++)
563 osect_vma = sec->output_section->vma;
566 *addendp -= osect_vma;
573 /* Used by the assembler. */
575 static bfd_reloc_status_type
576 aoutarm_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED,
577 arelent *reloc_entry ATTRIBUTE_UNUSED,
578 asymbol *symbol ATTRIBUTE_UNUSED,
579 void * data ATTRIBUTE_UNUSED,
580 asection *input_section ATTRIBUTE_UNUSED,
581 bfd *output_bfd ATTRIBUTE_UNUSED,
582 char **error_message ATTRIBUTE_UNUSED)
584 /* This is dead simple at present. */
588 /* Used by the assembler. */
590 static bfd_reloc_status_type
591 aoutarm_fix_pcrel_26 (bfd *abfd,
592 arelent *reloc_entry,
595 asection *input_section,
597 char **error_message ATTRIBUTE_UNUSED)
600 bfd_size_type addr = reloc_entry->address;
601 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
602 bfd_reloc_status_type flag = bfd_reloc_ok;
604 /* If this is an undefined symbol, return error. */
605 if (bfd_is_und_section (symbol->section)
606 && (symbol->flags & BSF_WEAK) == 0)
607 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
609 /* If the sections are different, and we are doing a partial relocation,
610 just ignore it for now. */
611 if (symbol->section->name != input_section->name
612 && output_bfd != (bfd *)NULL)
613 return bfd_reloc_continue;
615 relocation = (target & 0x00ffffff) << 2;
616 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
617 relocation += symbol->value;
618 relocation += symbol->section->output_section->vma;
619 relocation += symbol->section->output_offset;
620 relocation += reloc_entry->addend;
621 relocation -= input_section->output_section->vma;
622 relocation -= input_section->output_offset;
626 return bfd_reloc_overflow;
628 /* Check for overflow. */
629 if (relocation & 0x02000000)
631 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
632 flag = bfd_reloc_overflow;
634 else if (relocation & ~(bfd_vma) 0x03ffffff)
635 flag = bfd_reloc_overflow;
637 target &= ~0x00ffffff;
638 target |= (relocation >> 2) & 0x00ffffff;
639 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
641 /* Now the ARM magic... Change the reloc type so that it is marked as done.
642 Strictly this is only necessary if we are doing a partial relocation. */
643 reloc_entry->howto = &aoutarm_std_reloc_howto[ARM_26D];
648 static bfd_reloc_status_type
649 coff_thumb_pcrel_common (bfd *abfd,
650 arelent *reloc_entry,
653 asection *input_section,
655 char **error_message ATTRIBUTE_UNUSED,
656 thumb_pcrel_branchtype btype)
658 bfd_vma relocation = 0;
659 bfd_size_type addr = reloc_entry->address;
660 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
661 bfd_reloc_status_type flag = bfd_reloc_ok;
666 /* NOTE: This routine is currently used by GAS, but not by the link
673 signbit = 0x00000100;
679 signbit = 0x00000800;
685 signbit = 0x00400000;
692 /* If this is an undefined symbol, return error. */
693 if (bfd_is_und_section (symbol->section)
694 && (symbol->flags & BSF_WEAK) == 0)
695 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
697 /* If the sections are different, and we are doing a partial relocation,
698 just ignore it for now. */
699 if (symbol->section->name != input_section->name
700 && output_bfd != (bfd *)NULL)
701 return bfd_reloc_continue;
707 relocation = ((target & dstmsk) << 1);
711 if (bfd_big_endian (abfd))
712 relocation = ((target & 0x7ff) << 1) | ((target & 0x07ff0000) >> 4);
714 relocation = ((target & 0x7ff) << 12) | ((target & 0x07ff0000) >> 15);
721 relocation = (relocation ^ signbit) - signbit; /* Sign extend. */
722 relocation += symbol->value;
723 relocation += symbol->section->output_section->vma;
724 relocation += symbol->section->output_offset;
725 relocation += reloc_entry->addend;
726 relocation -= input_section->output_section->vma;
727 relocation -= input_section->output_offset;
731 return bfd_reloc_overflow;
733 /* Check for overflow. */
734 if (relocation & signbit)
736 if ((relocation & ~offmsk) != ~offmsk)
737 flag = bfd_reloc_overflow;
739 else if (relocation & ~offmsk)
740 flag = bfd_reloc_overflow;
747 target |= (relocation >> 1);
751 if (bfd_big_endian (abfd))
752 target |= (((relocation & 0xfff) >> 1)
753 | ((relocation << 4) & 0x07ff0000));
755 target |= (((relocation & 0xffe) << 15)
756 | ((relocation >> 12) & 0x7ff));
763 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr);
765 /* Now the ARM magic... Change the reloc type so that it is marked as done.
766 Strictly this is only necessary if we are doing a partial relocation. */
767 reloc_entry->howto = & aoutarm_std_reloc_howto [ARM_26D];
769 /* TODO: We should possibly have DONE entries for the THUMB PCREL relocations. */
774 static bfd_reloc_status_type
775 coff_thumb_pcrel_23 (bfd *abfd,
776 arelent *reloc_entry,
779 asection *input_section,
781 char **error_message)
783 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
784 input_section, output_bfd, error_message,
788 static bfd_reloc_status_type
789 coff_thumb_pcrel_9 (bfd *abfd,
790 arelent *reloc_entry,
793 asection *input_section,
795 char **error_message)
797 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
798 input_section, output_bfd, error_message,
801 #endif /* not ARM_WINCE */
803 static bfd_reloc_status_type
804 coff_thumb_pcrel_12 (bfd *abfd,
805 arelent *reloc_entry,
808 asection *input_section,
810 char **error_message)
812 return coff_thumb_pcrel_common (abfd, reloc_entry, symbol, data,
813 input_section, output_bfd, error_message,
817 static reloc_howto_type *
818 coff_arm_reloc_type_lookup (bfd * abfd, bfd_reloc_code_real_type code)
820 #define ASTD(i,j) case i: return aoutarm_std_reloc_howto + j
822 if (code == BFD_RELOC_CTOR)
823 switch (bfd_arch_bits_per_address (abfd))
835 ASTD (BFD_RELOC_32, ARM_32);
836 ASTD (BFD_RELOC_RVA, ARM_RVA32);
837 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
838 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
839 ASTD (BFD_RELOC_32_SECREL, ARM_SECREL);
841 ASTD (BFD_RELOC_8, ARM_8);
842 ASTD (BFD_RELOC_16, ARM_16);
843 ASTD (BFD_RELOC_32, ARM_32);
844 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, ARM_26);
845 ASTD (BFD_RELOC_ARM_PCREL_BLX, ARM_26);
846 ASTD (BFD_RELOC_8_PCREL, ARM_DISP8);
847 ASTD (BFD_RELOC_16_PCREL, ARM_DISP16);
848 ASTD (BFD_RELOC_32_PCREL, ARM_DISP32);
849 ASTD (BFD_RELOC_RVA, ARM_RVA32);
850 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH9, ARM_THUMB9);
851 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH12, ARM_THUMB12);
852 ASTD (BFD_RELOC_THUMB_PCREL_BRANCH23, ARM_THUMB23);
853 ASTD (BFD_RELOC_THUMB_PCREL_BLX, ARM_THUMB23);
855 default: return NULL;
859 static reloc_howto_type *
860 coff_arm_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
866 i < (sizeof (aoutarm_std_reloc_howto)
867 / sizeof (aoutarm_std_reloc_howto[0]));
869 if (aoutarm_std_reloc_howto[i].name != NULL
870 && strcasecmp (aoutarm_std_reloc_howto[i].name, r_name) == 0)
871 return &aoutarm_std_reloc_howto[i];
876 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2
877 #define COFF_PAGE_SIZE 0x1000
879 /* Turn a howto into a reloc nunmber. */
880 #define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
881 #define BADMAG(x) ARMBADMAG(x)
882 #define ARM 1 /* Customize coffcode.h. */
885 /* Make sure that the 'r_offset' field is copied properly
886 so that identical binaries will compare the same. */
887 #define SWAP_IN_RELOC_OFFSET H_GET_32
888 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
891 /* Extend the coff_link_hash_table structure with a few ARM specific fields.
892 This allows us to store global data here without actually creating any
893 global variables, which is a no-no in the BFD world. */
894 struct coff_arm_link_hash_table
896 /* The original coff_link_hash_table structure. MUST be first field. */
897 struct coff_link_hash_table root;
899 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
900 bfd_size_type thumb_glue_size;
902 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
903 bfd_size_type arm_glue_size;
905 /* An arbitrary input BFD chosen to hold the glue sections. */
906 bfd * bfd_of_glue_owner;
908 /* Support interworking with old, non-interworking aware ARM code. */
909 int support_old_code;
912 /* Get the ARM coff linker hash table from a link_info structure. */
913 #define coff_arm_hash_table(info) \
914 ((struct coff_arm_link_hash_table *) ((info)->hash))
916 /* Create an ARM coff linker hash table. */
918 static struct bfd_link_hash_table *
919 coff_arm_link_hash_table_create (bfd * abfd)
921 struct coff_arm_link_hash_table * ret;
922 bfd_size_type amt = sizeof (struct coff_arm_link_hash_table);
924 ret = bfd_zmalloc (amt);
928 if (!_bfd_coff_link_hash_table_init (&ret->root,
930 _bfd_coff_link_hash_newfunc,
931 sizeof (struct coff_link_hash_entry)))
937 return & ret->root.root;
941 arm_emit_base_file_entry (struct bfd_link_info *info,
943 asection *input_section,
944 bfd_vma reloc_offset)
946 bfd_vma addr = (reloc_offset
948 + input_section->output_offset
949 + input_section->output_section->vma);
951 if (coff_data (output_bfd)->pe)
952 addr -= pe_data (output_bfd)->pe_opthdr.ImageBase;
953 if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1)
956 bfd_set_error (bfd_error_system_call);
961 /* The thumb form of a long branch is a bit finicky, because the offset
962 encoding is split over two fields, each in it's own instruction. They
963 can occur in any order. So given a thumb form of long branch, and an
964 offset, insert the offset into the thumb branch and return finished
967 It takes two thumb instructions to encode the target address. Each has
968 11 bits to invest. The upper 11 bits are stored in one (identified by
969 H-0.. see below), the lower 11 bits are stored in the other (identified
972 Combine together and shifted left by 1 (it's a half word address) and
976 H-0, upper address-0 = 000
978 H-1, lower address-0 = 800
980 They can be ordered either way, but the arm tools I've seen always put
981 the lower one first. It probably doesn't matter. krk@cygnus.com
983 XXX: Actually the order does matter. The second instruction (H-1)
984 moves the computed address into the PC, so it must be the second one
985 in the sequence. The problem, however is that whilst little endian code
986 stores the instructions in HI then LOW order, big endian code does the
987 reverse. nickc@cygnus.com. */
989 #define LOW_HI_ORDER 0xF800F000
990 #define HI_LOW_ORDER 0xF000F800
993 insert_thumb_branch (insn32 br_insn, int rel_off)
995 unsigned int low_bits;
996 unsigned int high_bits;
998 BFD_ASSERT ((rel_off & 1) != 1);
1000 rel_off >>= 1; /* Half word aligned address. */
1001 low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */
1002 high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */
1004 if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
1005 br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
1006 else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER)
1007 br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits;
1009 /* FIXME: the BFD library should never abort except for internal errors
1010 - it should return an error status. */
1011 abort (); /* Error - not a valid branch instruction form. */
1017 static struct coff_link_hash_entry *
1018 find_thumb_glue (struct bfd_link_info *info,
1023 struct coff_link_hash_entry *myh;
1024 bfd_size_type amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1026 tmp_name = bfd_malloc (amt);
1028 BFD_ASSERT (tmp_name);
1030 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1032 myh = coff_link_hash_lookup
1033 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1036 /* xgettext:c-format */
1037 _bfd_error_handler (_("%pB: unable to find THUMB glue '%s' for `%s'"),
1038 input_bfd, tmp_name, name);
1044 #endif /* not ARM_WINCE */
1046 static struct coff_link_hash_entry *
1047 find_arm_glue (struct bfd_link_info *info,
1052 struct coff_link_hash_entry * myh;
1053 bfd_size_type amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1055 tmp_name = bfd_malloc (amt);
1057 BFD_ASSERT (tmp_name);
1059 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1061 myh = coff_link_hash_lookup
1062 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1065 /* xgettext:c-format */
1066 _bfd_error_handler (_("%pB: unable to find ARM glue '%s' for `%s'"),
1067 input_bfd, tmp_name, name);
1079 ldr r12, __func_addr
1082 .word func @ behave as if you saw a ARM_32 reloc
1085 #define ARM2THUMB_GLUE_SIZE 12
1086 static const insn32 a2t1_ldr_insn = 0xe59fc000;
1087 static const insn32 a2t2_bx_r12_insn = 0xe12fff1c;
1088 static const insn32 a2t3_func_addr_insn = 0x00000001;
1091 Thumb->ARM: Thumb->(non-interworking aware) ARM
1095 __func_from_thumb: __func_from_thumb:
1097 nop ldr r6, __func_addr
1099 __func_change_to_arm: bx r6
1101 __func_back_to_thumb:
1108 #define THUMB2ARM_GLUE_SIZE (globals->support_old_code ? 20 : 8)
1110 static const insn16 t2a1_bx_pc_insn = 0x4778;
1111 static const insn16 t2a2_noop_insn = 0x46c0;
1112 static const insn32 t2a3_b_insn = 0xea000000;
1114 static const insn16 t2a1_push_insn = 0xb540;
1115 static const insn16 t2a2_ldr_insn = 0x4e03;
1116 static const insn16 t2a3_mov_insn = 0x46fe;
1117 static const insn16 t2a4_bx_insn = 0x4730;
1118 static const insn32 t2a5_pop_insn = 0xe8bd4040;
1119 static const insn32 t2a6_bx_insn = 0xe12fff1e;
1123 We should really create new local (static) symbols in destination
1124 object for each stub we create. We should also create local
1125 (static) symbols within the stubs when switching between ARM and
1126 Thumb code. This will ensure that the debugger and disassembler
1127 can present a better view of stubs.
1129 We can treat stubs like literal sections, and for the THUMB9 ones
1130 (short addressing range) we should be able to insert the stubs
1131 between sections. i.e. the simplest approach (since relocations
1132 are done on a section basis) is to dump the stubs at the end of
1133 processing a section. That way we can always try and minimise the
1134 offset to and from a stub. However, this does not map well onto
1135 the way that the linker/BFD does its work: mapping all input
1136 sections to output sections via the linker script before doing
1139 Unfortunately it may be easier to just to disallow short range
1140 Thumb->ARM stubs (i.e. no conditional inter-working branches,
1141 only branch-and-link (BL) calls. This will simplify the processing
1142 since we can then put all of the stubs into their own section.
1145 On a different subject, rather than complaining when a
1146 branch cannot fit in the number of bits available for the
1147 instruction we should generate a trampoline stub (needed to
1148 address the complete 32bit address space). */
1150 /* The standard COFF backend linker does not cope with the special
1151 Thumb BRANCH23 relocation. The alternative would be to split the
1152 BRANCH23 into seperate HI23 and LO23 relocations. However, it is a
1153 bit simpler simply providing our own relocation driver. */
1155 /* The reloc processing routine for the ARM/Thumb COFF linker. NOTE:
1156 This code is a very slightly modified copy of
1157 _bfd_coff_generic_relocate_section. It would be a much more
1158 maintainable solution to have a MACRO that could be expanded within
1159 _bfd_coff_generic_relocate_section that would only be provided for
1160 ARM/Thumb builds. It is only the code marked THUMBEXTENSION that
1161 is different from the original. */
1164 coff_arm_relocate_section (bfd *output_bfd,
1165 struct bfd_link_info *info,
1167 asection *input_section,
1169 struct internal_reloc *relocs,
1170 struct internal_syment *syms,
1171 asection **sections)
1173 struct internal_reloc * rel;
1174 struct internal_reloc * relend;
1176 bfd_vma high_address = bfd_get_section_limit (input_bfd, input_section);
1180 relend = rel + input_section->reloc_count;
1182 for (; rel < relend; rel++)
1186 struct coff_link_hash_entry * h;
1187 struct internal_syment * sym;
1190 reloc_howto_type * howto;
1191 bfd_reloc_status_type rstat;
1194 symndx = rel->r_symndx;
1203 h = obj_coff_sym_hashes (input_bfd)[symndx];
1204 sym = syms + symndx;
1207 /* COFF treats common symbols in one of two ways. Either the
1208 size of the symbol is included in the section contents, or it
1209 is not. We assume that the size is not included, and force
1210 the rtype_to_howto function to adjust the addend as needed. */
1212 if (sym != NULL && sym->n_scnum != 0)
1213 addend = - sym->n_value;
1217 howto = coff_rtype_to_howto (input_bfd, input_section, rel, h,
1222 /* The relocation_section function will skip pcrel_offset relocs
1223 when doing a relocatable link. However, we want to convert
1224 ARM_26 to ARM_26D relocs if possible. We return a fake howto in
1225 this case without pcrel_offset set, and adjust the addend to
1226 compensate. 'partial_inplace' is also set, since we want 'done'
1227 relocations to be reflected in section's data. */
1228 if (rel->r_type == ARM_26
1230 && bfd_link_relocatable (info)
1231 && (h->root.type == bfd_link_hash_defined
1232 || h->root.type == bfd_link_hash_defweak)
1233 && (h->root.u.def.section->output_section
1234 == input_section->output_section))
1236 static reloc_howto_type fake_arm26_reloc =
1243 complain_overflow_signed,
1244 aoutarm_fix_pcrel_26 ,
1251 addend -= rel->r_vaddr - input_section->vma;
1253 /* FIXME: I don't know why, but the hack is necessary for correct
1254 generation of bl's instruction offset. */
1257 howto = & fake_arm26_reloc;
1261 /* MS ARM-CE makes the reloc relative to the opcode's pc, not
1262 the next opcode's pc, so is off by one. */
1263 if (howto->pc_relative && !bfd_link_relocatable (info))
1267 /* If we are doing a relocatable link, then we can just ignore
1268 a PC relative reloc that is pcrel_offset. It will already
1269 have the correct value. If this is not a relocatable link,
1270 then we should ignore the symbol value. */
1271 if (howto->pc_relative && howto->pcrel_offset)
1273 if (bfd_link_relocatable (info))
1275 /* FIXME - it is not clear which targets need this next test
1276 and which do not. It is known that it is needed for the
1277 VxWorks targets but it is also known that it was suppressed
1278 for other ARM targets. This ought to be sorted out one day. */
1279 #ifdef ARM_COFF_BUGFIX
1280 /* We must not ignore the symbol value. If the symbol is
1281 within the same section, the relocation should have already
1282 been fixed, but if it is not, we'll be handed a reloc into
1283 the beginning of the symbol's section, so we must not cancel
1284 out the symbol's value, otherwise we'll be adding it in
1286 if (sym != NULL && sym->n_scnum != 0)
1287 addend += sym->n_value;
1299 sec = bfd_abs_section_ptr;
1304 sec = sections[symndx];
1305 val = (sec->output_section->vma
1306 + sec->output_offset
1313 /* We don't output the stubs if we are generating a
1314 relocatable output file, since we may as well leave the
1315 stub generation to the final linker pass. If we fail to
1316 verify that the name is defined, we'll try to build stubs
1317 for an undefined name... */
1318 if (! bfd_link_relocatable (info)
1319 && ( h->root.type == bfd_link_hash_defined
1320 || h->root.type == bfd_link_hash_defweak))
1322 asection * h_sec = h->root.u.def.section;
1323 const char * name = h->root.root.string;
1325 /* h locates the symbol referenced in the reloc. */
1326 h_val = (h->root.u.def.value
1327 + h_sec->output_section->vma
1328 + h_sec->output_offset);
1330 if (howto->type == ARM_26)
1332 if ( h->symbol_class == C_THUMBSTATFUNC
1333 || h->symbol_class == C_THUMBEXTFUNC)
1335 /* Arm code calling a Thumb function. */
1336 unsigned long int tmp;
1339 long int ret_offset;
1340 struct coff_link_hash_entry * myh;
1341 struct coff_arm_link_hash_table * globals;
1343 myh = find_arm_glue (info, name, input_bfd);
1347 globals = coff_arm_hash_table (info);
1349 BFD_ASSERT (globals != NULL);
1350 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1352 my_offset = myh->root.u.def.value;
1354 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1355 ARM2THUMB_GLUE_SECTION_NAME);
1356 BFD_ASSERT (s != NULL);
1357 BFD_ASSERT (s->contents != NULL);
1358 BFD_ASSERT (s->output_section != NULL);
1360 if ((my_offset & 0x01) == 0x01)
1362 if (h_sec->owner != NULL
1363 && INTERWORK_SET (h_sec->owner)
1364 && ! INTERWORK_FLAG (h_sec->owner))
1366 /* xgettext:c-format */
1367 (_("%pB(%s): warning: interworking not enabled; "
1368 "first occurrence: %pB: arm call to thumb"),
1369 h_sec->owner, name, input_bfd);
1372 myh->root.u.def.value = my_offset;
1374 bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn,
1375 s->contents + my_offset);
1377 bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn,
1378 s->contents + my_offset + 4);
1380 /* It's a thumb address. Add the low order bit. */
1381 bfd_put_32 (output_bfd, h_val | a2t3_func_addr_insn,
1382 s->contents + my_offset + 8);
1385 && !arm_emit_base_file_entry (info, output_bfd,
1390 BFD_ASSERT (my_offset <= globals->arm_glue_size);
1392 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1393 - input_section->vma);
1395 tmp = tmp & 0xFF000000;
1397 /* Somehow these are both 4 too far, so subtract 8. */
1401 + s->output_section->vma
1402 - (input_section->output_offset
1403 + input_section->output_section->vma
1407 tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF);
1409 bfd_put_32 (output_bfd, (bfd_vma) tmp,
1410 contents + rel->r_vaddr - input_section->vma);
1416 /* Note: We used to check for ARM_THUMB9 and ARM_THUMB12. */
1417 else if (howto->type == ARM_THUMB23)
1419 if ( h->symbol_class == C_EXT
1420 || h->symbol_class == C_STAT
1421 || h->symbol_class == C_LABEL)
1423 /* Thumb code calling an ARM function. */
1426 unsigned long int tmp;
1427 long int ret_offset;
1428 struct coff_link_hash_entry * myh;
1429 struct coff_arm_link_hash_table * globals;
1431 myh = find_thumb_glue (info, name, input_bfd);
1435 globals = coff_arm_hash_table (info);
1437 BFD_ASSERT (globals != NULL);
1438 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1440 my_offset = myh->root.u.def.value;
1442 s = bfd_get_section_by_name (globals->bfd_of_glue_owner,
1443 THUMB2ARM_GLUE_SECTION_NAME);
1445 BFD_ASSERT (s != NULL);
1446 BFD_ASSERT (s->contents != NULL);
1447 BFD_ASSERT (s->output_section != NULL);
1449 if ((my_offset & 0x01) == 0x01)
1451 if (h_sec->owner != NULL
1452 && INTERWORK_SET (h_sec->owner)
1453 && ! INTERWORK_FLAG (h_sec->owner)
1454 && ! globals->support_old_code)
1456 /* xgettext:c-format */
1457 (_("%pB(%s): warning: interworking not enabled; "
1458 "first occurrence: %pB: thumb call to arm; "
1459 "consider relinking with --support-old-code "
1461 h_sec->owner, name, input_bfd);
1464 myh->root.u.def.value = my_offset;
1466 if (globals->support_old_code)
1468 bfd_put_16 (output_bfd, (bfd_vma) t2a1_push_insn,
1469 s->contents + my_offset);
1471 bfd_put_16 (output_bfd, (bfd_vma) t2a2_ldr_insn,
1472 s->contents + my_offset + 2);
1474 bfd_put_16 (output_bfd, (bfd_vma) t2a3_mov_insn,
1475 s->contents + my_offset + 4);
1477 bfd_put_16 (output_bfd, (bfd_vma) t2a4_bx_insn,
1478 s->contents + my_offset + 6);
1480 bfd_put_32 (output_bfd, (bfd_vma) t2a5_pop_insn,
1481 s->contents + my_offset + 8);
1483 bfd_put_32 (output_bfd, (bfd_vma) t2a6_bx_insn,
1484 s->contents + my_offset + 12);
1486 /* Store the address of the function in the last word of the stub. */
1487 bfd_put_32 (output_bfd, h_val,
1488 s->contents + my_offset + 16);
1491 && !arm_emit_base_file_entry (info,
1498 bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn,
1499 s->contents + my_offset);
1501 bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn,
1502 s->contents + my_offset + 2);
1505 /* Address of destination of the stub. */
1506 ((bfd_signed_vma) h_val)
1508 /* Offset from the start of the current section to the start of the stubs. */
1510 /* Offset of the start of this stub from the start of the stubs. */
1512 /* Address of the start of the current section. */
1513 + s->output_section->vma)
1514 /* The branch instruction is 4 bytes into the stub. */
1516 /* ARM branches work from the pc of the instruction + 8. */
1519 bfd_put_32 (output_bfd,
1520 (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF),
1521 s->contents + my_offset + 4);
1526 BFD_ASSERT (my_offset <= globals->thumb_glue_size);
1528 /* Now go back and fix up the original BL insn to point
1533 - (input_section->output_offset
1537 tmp = bfd_get_32 (input_bfd, contents + rel->r_vaddr
1538 - input_section->vma);
1540 bfd_put_32 (output_bfd,
1541 (bfd_vma) insert_thumb_branch (tmp,
1543 contents + rel->r_vaddr - input_section->vma);
1551 /* If the relocation type and destination symbol does not
1552 fall into one of the above categories, then we can just
1553 perform a direct link. */
1556 rstat = bfd_reloc_ok;
1558 if ( h->root.type == bfd_link_hash_defined
1559 || h->root.type == bfd_link_hash_defweak)
1563 sec = h->root.u.def.section;
1564 val = (h->root.u.def.value
1565 + sec->output_section->vma
1566 + sec->output_offset);
1569 else if (! bfd_link_relocatable (info))
1570 (*info->callbacks->undefined_symbol)
1571 (info, h->root.root.string, input_bfd, input_section,
1572 rel->r_vaddr - input_section->vma, TRUE);
1575 /* Emit a reloc if the backend thinks it needs it. */
1578 && pe_data(output_bfd)->in_reloc_p(output_bfd, howto)
1579 && !arm_emit_base_file_entry (info, output_bfd, input_section,
1584 rstat = bfd_reloc_ok;
1586 /* Only perform this fix during the final link, not a relocatable link. */
1587 else if (! bfd_link_relocatable (info)
1588 && howto->type == ARM_THUMB23)
1590 /* This is pretty much a copy of what the default
1591 _bfd_final_link_relocate and _bfd_relocate_contents
1592 routines do to perform a relocation, with special
1593 processing for the split addressing of the Thumb BL
1594 instruction. Again, it would probably be simpler adding a
1595 ThumbBRANCH23 specific macro expansion into the default
1598 bfd_vma address = rel->r_vaddr - input_section->vma;
1600 if (address > high_address)
1601 rstat = bfd_reloc_outofrange;
1604 bfd_vma relocation = val + addend;
1605 int size = bfd_get_reloc_size (howto);
1606 bfd_boolean overflow = FALSE;
1607 bfd_byte *location = contents + address;
1608 bfd_vma x = bfd_get_32 (input_bfd, location);
1609 bfd_vma src_mask = 0x007FFFFE;
1610 bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;
1611 bfd_signed_vma reloc_signed_min = ~reloc_signed_max;
1613 bfd_signed_vma signed_check;
1615 bfd_signed_vma signed_add;
1617 BFD_ASSERT (size == 4);
1619 /* howto->pc_relative should be TRUE for type 14 BRANCH23. */
1620 relocation -= (input_section->output_section->vma
1621 + input_section->output_offset);
1623 /* howto->pcrel_offset should be TRUE for type 14 BRANCH23. */
1624 relocation -= address;
1626 /* No need to negate the relocation with BRANCH23. */
1627 /* howto->complain_on_overflow == complain_overflow_signed for BRANCH23. */
1628 /* howto->rightshift == 1 */
1630 /* Drop unwanted bits from the value we are relocating to. */
1631 check = relocation >> howto->rightshift;
1633 /* If this is a signed value, the rightshift just dropped
1634 leading 1 bits (assuming twos complement). */
1635 if ((bfd_signed_vma) relocation >= 0)
1636 signed_check = check;
1638 signed_check = (check
1640 & ~((bfd_vma) - 1 >> howto->rightshift)));
1642 /* Get the value from the object file. */
1643 if (bfd_big_endian (input_bfd))
1644 add = (((x) & 0x07ff0000) >> 4) | (((x) & 0x7ff) << 1);
1646 add = ((((x) & 0x7ff) << 12) | (((x) & 0x07ff0000) >> 15));
1648 /* Get the value from the object file with an appropriate sign.
1649 The expression involving howto->src_mask isolates the upper
1650 bit of src_mask. If that bit is set in the value we are
1651 adding, it is negative, and we subtract out that number times
1652 two. If src_mask includes the highest possible bit, then we
1653 can not get the upper bit, but that does not matter since
1654 signed_add needs no adjustment to become negative in that
1658 if ((add & (((~ src_mask) >> 1) & src_mask)) != 0)
1659 signed_add -= (((~ src_mask) >> 1) & src_mask) << 1;
1661 /* howto->bitpos == 0 */
1662 /* Add the value from the object file, shifted so that it is a
1664 signed_check += signed_add;
1665 relocation += signed_add;
1667 BFD_ASSERT (howto->complain_on_overflow == complain_overflow_signed);
1669 /* Assumes two's complement. */
1670 if ( signed_check > reloc_signed_max
1671 || signed_check < reloc_signed_min)
1674 /* Put the relocation into the correct bits.
1675 For a BLX instruction, make sure that the relocation is rounded up
1676 to a word boundary. This follows the semantics of the instruction
1677 which specifies that bit 1 of the target address will come from bit
1678 1 of the base address. */
1679 if (bfd_big_endian (input_bfd))
1681 if ((x & 0x1800) == 0x0800 && (relocation & 0x02))
1683 relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
1687 if ((x & 0x18000000) == 0x08000000 && (relocation & 0x02))
1689 relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
1692 /* Add the relocation to the correct bits of X. */
1693 x = ((x & ~howto->dst_mask) | relocation);
1695 /* Put the relocated value back in the object file. */
1696 bfd_put_32 (input_bfd, x, location);
1698 rstat = overflow ? bfd_reloc_overflow : bfd_reloc_ok;
1703 if (bfd_link_relocatable (info) && ! howto->partial_inplace)
1704 rstat = bfd_reloc_ok;
1706 rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
1708 rel->r_vaddr - input_section->vma,
1710 /* Only perform this fix during the final link, not a relocatable link. */
1711 if (! bfd_link_relocatable (info)
1712 && (rel->r_type == ARM_32 || rel->r_type == ARM_RVA32))
1714 /* Determine if we need to set the bottom bit of a relocated address
1715 because the address is the address of a Thumb code symbol. */
1716 int patchit = FALSE;
1719 && ( h->symbol_class == C_THUMBSTATFUNC
1720 || h->symbol_class == C_THUMBEXTFUNC))
1724 else if (sym != NULL
1725 && sym->n_scnum > N_UNDEF)
1727 /* No hash entry - use the symbol instead. */
1728 if ( sym->n_sclass == C_THUMBSTATFUNC
1729 || sym->n_sclass == C_THUMBEXTFUNC)
1735 bfd_byte * location = contents + rel->r_vaddr - input_section->vma;
1736 bfd_vma x = bfd_get_32 (input_bfd, location);
1738 bfd_put_32 (input_bfd, x | 1, location);
1748 case bfd_reloc_outofrange:
1750 /* xgettext:c-format */
1751 (_("%pB: bad reloc address %#" PRIx64 " in section `%pA'"),
1752 input_bfd, (uint64_t) rel->r_vaddr, input_section);
1754 case bfd_reloc_overflow:
1757 char buf[SYMNMLEN + 1];
1765 name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
1770 (*info->callbacks->reloc_overflow)
1771 (info, (h ? &h->root : NULL), name, howto->name,
1772 (bfd_vma) 0, input_bfd, input_section,
1773 rel->r_vaddr - input_section->vma);
1781 #ifndef COFF_IMAGE_WITH_PE
1784 bfd_arm_allocate_interworking_sections (struct bfd_link_info * info)
1788 struct coff_arm_link_hash_table * globals;
1790 globals = coff_arm_hash_table (info);
1792 BFD_ASSERT (globals != NULL);
1794 if (globals->arm_glue_size != 0)
1796 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1798 s = bfd_get_section_by_name
1799 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1801 BFD_ASSERT (s != NULL);
1803 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->arm_glue_size);
1805 s->size = globals->arm_glue_size;
1809 if (globals->thumb_glue_size != 0)
1811 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1813 s = bfd_get_section_by_name
1814 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1816 BFD_ASSERT (s != NULL);
1818 foo = bfd_alloc (globals->bfd_of_glue_owner, globals->thumb_glue_size);
1820 s->size = globals->thumb_glue_size;
1828 record_arm_to_thumb_glue (struct bfd_link_info * info,
1829 struct coff_link_hash_entry * h)
1831 const char * name = h->root.root.string;
1832 register asection * s;
1834 struct coff_link_hash_entry * myh;
1835 struct bfd_link_hash_entry * bh;
1836 struct coff_arm_link_hash_table * globals;
1840 globals = coff_arm_hash_table (info);
1842 BFD_ASSERT (globals != NULL);
1843 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1845 s = bfd_get_section_by_name
1846 (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME);
1848 BFD_ASSERT (s != NULL);
1850 amt = strlen (name) + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1;
1851 tmp_name = bfd_malloc (amt);
1853 BFD_ASSERT (tmp_name);
1855 sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name);
1857 myh = coff_link_hash_lookup
1858 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1863 /* We've already seen this guy. */
1867 /* The only trick here is using globals->arm_glue_size as the value. Even
1868 though the section isn't allocated yet, this is where we will be putting
1871 val = globals->arm_glue_size + 1;
1872 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1873 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1877 globals->arm_glue_size += ARM2THUMB_GLUE_SIZE;
1884 record_thumb_to_arm_glue (struct bfd_link_info * info,
1885 struct coff_link_hash_entry * h)
1887 const char * name = h->root.root.string;
1890 struct coff_link_hash_entry * myh;
1891 struct bfd_link_hash_entry * bh;
1892 struct coff_arm_link_hash_table * globals;
1896 globals = coff_arm_hash_table (info);
1898 BFD_ASSERT (globals != NULL);
1899 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
1901 s = bfd_get_section_by_name
1902 (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME);
1904 BFD_ASSERT (s != NULL);
1906 amt = strlen (name) + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1;
1907 tmp_name = bfd_malloc (amt);
1909 BFD_ASSERT (tmp_name);
1911 sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name);
1913 myh = coff_link_hash_lookup
1914 (coff_hash_table (info), tmp_name, FALSE, FALSE, TRUE);
1919 /* We've already seen this guy. */
1924 val = globals->thumb_glue_size + 1;
1925 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1926 BSF_GLOBAL, s, val, NULL, TRUE, FALSE, &bh);
1928 /* If we mark it 'thumb', the disassembler will do a better job. */
1929 myh = (struct coff_link_hash_entry *) bh;
1930 myh->symbol_class = C_THUMBEXTFUNC;
1934 /* Allocate another symbol to mark where we switch to arm mode. */
1936 #define CHANGE_TO_ARM "__%s_change_to_arm"
1937 #define BACK_FROM_ARM "__%s_back_from_arm"
1939 amt = strlen (name) + strlen (CHANGE_TO_ARM) + 1;
1940 tmp_name = bfd_malloc (amt);
1942 BFD_ASSERT (tmp_name);
1944 sprintf (tmp_name, globals->support_old_code ? BACK_FROM_ARM : CHANGE_TO_ARM, name);
1947 val = globals->thumb_glue_size + (globals->support_old_code ? 8 : 4);
1948 bfd_coff_link_add_one_symbol (info, globals->bfd_of_glue_owner, tmp_name,
1949 BSF_LOCAL, s, val, NULL, TRUE, FALSE, &bh);
1953 globals->thumb_glue_size += THUMB2ARM_GLUE_SIZE;
1957 #endif /* not ARM_WINCE */
1959 /* Select a BFD to be used to hold the sections used by the glue code.
1960 This function is called from the linker scripts in ld/emultempl/
1964 bfd_arm_get_bfd_for_interworking (bfd * abfd,
1965 struct bfd_link_info * info)
1967 struct coff_arm_link_hash_table * globals;
1971 /* If we are only performing a partial link do not bother
1972 getting a bfd to hold the glue. */
1973 if (bfd_link_relocatable (info))
1976 globals = coff_arm_hash_table (info);
1978 BFD_ASSERT (globals != NULL);
1980 if (globals->bfd_of_glue_owner != NULL)
1983 sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME);
1987 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1988 | SEC_CODE | SEC_READONLY);
1989 sec = bfd_make_section_with_flags (abfd, ARM2THUMB_GLUE_SECTION_NAME,
1992 || ! bfd_set_section_alignment (abfd, sec, 2))
1996 sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME);
2000 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2001 | SEC_CODE | SEC_READONLY);
2002 sec = bfd_make_section_with_flags (abfd, THUMB2ARM_GLUE_SECTION_NAME,
2006 || ! bfd_set_section_alignment (abfd, sec, 2))
2010 /* Save the bfd for later use. */
2011 globals->bfd_of_glue_owner = abfd;
2017 bfd_arm_process_before_allocation (bfd * abfd,
2018 struct bfd_link_info * info,
2019 int support_old_code)
2022 struct coff_arm_link_hash_table * globals;
2024 /* If we are only performing a partial link do not bother
2025 to construct any glue. */
2026 if (bfd_link_relocatable (info))
2029 /* Here we have a bfd that is to be included on the link. We have a hook
2030 to do reloc rummaging, before section sizes are nailed down. */
2031 _bfd_coff_get_external_symbols (abfd);
2033 globals = coff_arm_hash_table (info);
2035 BFD_ASSERT (globals != NULL);
2036 BFD_ASSERT (globals->bfd_of_glue_owner != NULL);
2038 globals->support_old_code = support_old_code;
2040 /* Rummage around all the relocs and map the glue vectors. */
2041 sec = abfd->sections;
2046 for (; sec != NULL; sec = sec->next)
2048 struct internal_reloc * i;
2049 struct internal_reloc * rel;
2051 if (sec->reloc_count == 0)
2054 /* Load the relocs. */
2055 /* FIXME: there may be a storage leak here. */
2056 i = _bfd_coff_read_internal_relocs (abfd, sec, 1, 0, 0, 0);
2058 BFD_ASSERT (i != 0);
2060 for (rel = i; rel < i + sec->reloc_count; ++rel)
2062 unsigned short r_type = rel->r_type;
2064 struct coff_link_hash_entry * h;
2066 symndx = rel->r_symndx;
2068 /* If the relocation is not against a symbol it cannot concern us. */
2072 /* If the index is outside of the range of our table, something has gone wrong. */
2073 if (symndx >= obj_conv_table_size (abfd))
2075 /* xgettext:c-format */
2076 _bfd_error_handler (_("%pB: illegal symbol index in reloc: %ld"),
2081 h = obj_coff_sym_hashes (abfd)[symndx];
2083 /* If the relocation is against a static symbol it must be within
2084 the current section and so cannot be a cross ARM/Thumb relocation. */
2091 /* This one is a call from arm code. We need to look up
2092 the target of the call. If it is a thumb target, we
2095 if (h->symbol_class == C_THUMBEXTFUNC)
2096 record_arm_to_thumb_glue (info, h);
2101 /* This one is a call from thumb code. We used to look
2102 for ARM_THUMB9 and ARM_THUMB12 as well. We need to look
2103 up the target of the call. If it is an arm target, we
2104 insert glue. If the symbol does not exist it will be
2105 given a class of C_EXT and so we will generate a stub
2106 for it. This is not really a problem, since the link
2107 is doomed anyway. */
2109 switch (h->symbol_class)
2114 record_thumb_to_arm_glue (info, h);
2131 #endif /* ! defined (COFF_IMAGE_WITH_PE) */
2133 #define coff_bfd_reloc_type_lookup coff_arm_reloc_type_lookup
2134 #define coff_bfd_reloc_name_lookup coff_arm_reloc_name_lookup
2135 #define coff_relocate_section coff_arm_relocate_section
2136 #define coff_bfd_is_local_label_name coff_arm_is_local_label_name
2137 #define coff_adjust_symndx coff_arm_adjust_symndx
2138 #define coff_link_output_has_begun coff_arm_link_output_has_begun
2139 #define coff_final_link_postscript coff_arm_final_link_postscript
2140 #define coff_bfd_merge_private_bfd_data coff_arm_merge_private_bfd_data
2141 #define coff_bfd_print_private_bfd_data coff_arm_print_private_bfd_data
2142 #define coff_bfd_set_private_flags _bfd_coff_arm_set_private_flags
2143 #define coff_bfd_copy_private_bfd_data coff_arm_copy_private_bfd_data
2144 #define coff_bfd_link_hash_table_create coff_arm_link_hash_table_create
2146 /* When doing a relocatable link, we want to convert ARM_26 relocs
2147 into ARM_26D relocs. */
2150 coff_arm_adjust_symndx (bfd *obfd ATTRIBUTE_UNUSED,
2151 struct bfd_link_info *info ATTRIBUTE_UNUSED,
2154 struct internal_reloc *irel,
2155 bfd_boolean *adjustedp)
2157 if (irel->r_type == ARM_26)
2159 struct coff_link_hash_entry *h;
2161 h = obj_coff_sym_hashes (ibfd)[irel->r_symndx];
2163 && (h->root.type == bfd_link_hash_defined
2164 || h->root.type == bfd_link_hash_defweak)
2165 && h->root.u.def.section->output_section == sec->output_section)
2166 irel->r_type = ARM_26D;
2172 /* Called when merging the private data areas of two BFDs.
2173 This is important as it allows us to detect if we are
2174 attempting to merge binaries compiled for different ARM
2175 targets, eg different CPUs or different APCS's. */
2178 coff_arm_merge_private_bfd_data (bfd * ibfd, struct bfd_link_info *info)
2180 bfd *obfd = info->output_bfd;
2181 BFD_ASSERT (ibfd != NULL && obfd != NULL);
2186 /* If the two formats are different we cannot merge anything.
2187 This is not an error, since it is permissable to change the
2188 input and output formats. */
2189 if ( ibfd->xvec->flavour != bfd_target_coff_flavour
2190 || obfd->xvec->flavour != bfd_target_coff_flavour)
2193 /* Determine what should happen if the input ARM architecture
2194 does not match the output ARM architecture. */
2195 if (! bfd_arm_merge_machines (ibfd, obfd))
2198 /* Verify that the APCS is the same for the two BFDs. */
2199 if (APCS_SET (ibfd))
2201 if (APCS_SET (obfd))
2203 /* If the src and dest have different APCS flag bits set, fail. */
2204 if (APCS_26_FLAG (obfd) != APCS_26_FLAG (ibfd))
2207 /* xgettext: c-format */
2208 (_("error: %pB is compiled for APCS-%d, whereas %pB is compiled for APCS-%d"),
2209 ibfd, APCS_26_FLAG (ibfd) ? 26 : 32,
2210 obfd, APCS_26_FLAG (obfd) ? 26 : 32
2213 bfd_set_error (bfd_error_wrong_format);
2217 if (APCS_FLOAT_FLAG (obfd) != APCS_FLOAT_FLAG (ibfd))
2219 if (APCS_FLOAT_FLAG (ibfd))
2220 /* xgettext: c-format */
2221 _bfd_error_handler (_("\
2222 error: %pB passes floats in float registers, whereas %pB passes them in integer registers"),
2225 /* xgettext: c-format */
2226 _bfd_error_handler (_("\
2227 error: %pB passes floats in integer registers, whereas %pB passes them in float registers"),
2230 bfd_set_error (bfd_error_wrong_format);
2234 if (PIC_FLAG (obfd) != PIC_FLAG (ibfd))
2236 if (PIC_FLAG (ibfd))
2237 /* xgettext: c-format */
2238 _bfd_error_handler (_("\
2239 error: %pB is compiled as position independent code, whereas target %pB is absolute position"),
2242 /* xgettext: c-format */
2243 _bfd_error_handler (_("\
2244 error: %pB is compiled as absolute position code, whereas target %pB is position independent"),
2247 bfd_set_error (bfd_error_wrong_format);
2253 SET_APCS_FLAGS (obfd, APCS_26_FLAG (ibfd) | APCS_FLOAT_FLAG (ibfd) | PIC_FLAG (ibfd));
2255 /* Set up the arch and fields as well as these are probably wrong. */
2256 bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd));
2260 /* Check the interworking support. */
2261 if (INTERWORK_SET (ibfd))
2263 if (INTERWORK_SET (obfd))
2265 /* If the src and dest differ in their interworking issue a warning. */
2266 if (INTERWORK_FLAG (obfd) != INTERWORK_FLAG (ibfd))
2268 if (INTERWORK_FLAG (ibfd))
2269 /* xgettext: c-format */
2270 _bfd_error_handler (_("\
2271 warning: %pB supports interworking, whereas %pB does not"),
2274 /* xgettext: c-format */
2275 _bfd_error_handler (_("\
2276 warning: %pB does not support interworking, whereas %pB does"),
2282 SET_INTERWORK_FLAG (obfd, INTERWORK_FLAG (ibfd));
2289 /* Display the flags field. */
2292 coff_arm_print_private_bfd_data (bfd * abfd, void * ptr)
2294 FILE * file = (FILE *) ptr;
2296 BFD_ASSERT (abfd != NULL && ptr != NULL);
2298 fprintf (file, _("private flags = %x:"), coff_data (abfd)->flags);
2300 if (APCS_SET (abfd))
2302 /* xgettext: APCS is ARM Procedure Call Standard, it should not be translated. */
2303 fprintf (file, " [APCS-%d]", APCS_26_FLAG (abfd) ? 26 : 32);
2305 if (APCS_FLOAT_FLAG (abfd))
2306 fprintf (file, _(" [floats passed in float registers]"));
2308 fprintf (file, _(" [floats passed in integer registers]"));
2310 if (PIC_FLAG (abfd))
2311 fprintf (file, _(" [position independent]"));
2313 fprintf (file, _(" [absolute position]"));
2316 if (! INTERWORK_SET (abfd))
2317 fprintf (file, _(" [interworking flag not initialised]"));
2318 else if (INTERWORK_FLAG (abfd))
2319 fprintf (file, _(" [interworking supported]"));
2321 fprintf (file, _(" [interworking not supported]"));
2328 /* Copies the given flags into the coff_tdata.flags field.
2329 Typically these flags come from the f_flags[] field of
2330 the COFF filehdr structure, which contains important,
2331 target specific information.
2332 Note: Although this function is static, it is explicitly
2333 called from both coffcode.h and peicode.h. */
2336 _bfd_coff_arm_set_private_flags (bfd * abfd, flagword flags)
2340 BFD_ASSERT (abfd != NULL);
2342 flag = (flags & F_APCS26) ? F_APCS_26 : 0;
2344 /* Make sure that the APCS field has not been initialised to the opposite
2347 && ( (APCS_26_FLAG (abfd) != flag)
2348 || (APCS_FLOAT_FLAG (abfd) != (flags & F_APCS_FLOAT))
2349 || (PIC_FLAG (abfd) != (flags & F_PIC))
2353 flag |= (flags & (F_APCS_FLOAT | F_PIC));
2355 SET_APCS_FLAGS (abfd, flag);
2357 flag = (flags & F_INTERWORK);
2359 /* If the BFD has already had its interworking flag set, but it
2360 is different from the value that we have been asked to set,
2361 then assume that that merged code will not support interworking
2362 and set the flag accordingly. */
2363 if (INTERWORK_SET (abfd) && (INTERWORK_FLAG (abfd) != flag))
2366 _bfd_error_handler (_("warning: not setting interworking flag of %pB since it has already been specified as non-interworking"),
2369 _bfd_error_handler (_("warning: clearing the interworking flag of %pB due to outside request"),
2374 SET_INTERWORK_FLAG (abfd, flag);
2379 /* Copy the important parts of the target specific data
2380 from one instance of a BFD to another. */
2383 coff_arm_copy_private_bfd_data (bfd * src, bfd * dest)
2385 BFD_ASSERT (src != NULL && dest != NULL);
2390 /* If the destination is not in the same format as the source, do not do
2392 if (src->xvec != dest->xvec)
2395 /* Copy the flags field. */
2398 if (APCS_SET (dest))
2400 /* If the src and dest have different APCS flag bits set, fail. */
2401 if (APCS_26_FLAG (dest) != APCS_26_FLAG (src))
2404 if (APCS_FLOAT_FLAG (dest) != APCS_FLOAT_FLAG (src))
2407 if (PIC_FLAG (dest) != PIC_FLAG (src))
2411 SET_APCS_FLAGS (dest, APCS_26_FLAG (src) | APCS_FLOAT_FLAG (src)
2415 if (INTERWORK_SET (src))
2417 if (INTERWORK_SET (dest))
2419 /* If the src and dest have different interworking flags then turn
2420 off the interworking bit. */
2421 if (INTERWORK_FLAG (dest) != INTERWORK_FLAG (src))
2423 if (INTERWORK_FLAG (dest))
2425 /* xgettext:c-format */
2426 _bfd_error_handler (_("\
2427 warning: clearing the interworking flag of %pB because non-interworking code in %pB has been linked with it"),
2431 SET_INTERWORK_FLAG (dest, 0);
2436 SET_INTERWORK_FLAG (dest, INTERWORK_FLAG (src));
2443 /* Note: the definitions here of LOCAL_LABEL_PREFIX and USER_LABEL_PREIFX
2444 *must* match the definitions in gcc/config/arm/{coff|semi|aout}.h. */
2445 #ifndef LOCAL_LABEL_PREFIX
2446 #define LOCAL_LABEL_PREFIX ""
2448 #ifndef USER_LABEL_PREFIX
2449 #define USER_LABEL_PREFIX "_"
2452 /* Like _bfd_coff_is_local_label_name, but
2453 a) test against USER_LABEL_PREFIX, to avoid stripping labels known to be
2455 b) Allow other prefixes than ".", e.g. an empty prefix would cause all
2456 labels of the form Lxxx to be stripped. */
2459 coff_arm_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
2462 #ifdef USER_LABEL_PREFIX
2463 if (USER_LABEL_PREFIX[0] != 0)
2465 size_t len = strlen (USER_LABEL_PREFIX);
2467 if (strncmp (name, USER_LABEL_PREFIX, len) == 0)
2472 #ifdef LOCAL_LABEL_PREFIX
2473 /* If there is a prefix for local labels then look for this.
2474 If the prefix exists, but it is empty, then ignore the test. */
2476 if (LOCAL_LABEL_PREFIX[0] != 0)
2478 size_t len = strlen (LOCAL_LABEL_PREFIX);
2480 if (strncmp (name, LOCAL_LABEL_PREFIX, len) != 0)
2483 /* Perform the checks below for the rest of the name. */
2488 return name[0] == 'L';
2491 /* This piece of machinery exists only to guarantee that the bfd that holds
2492 the glue section is written last.
2494 This does depend on bfd_make_section attaching a new section to the
2495 end of the section list for the bfd. */
2498 coff_arm_link_output_has_begun (bfd * sub, struct coff_final_link_info * info)
2500 return (sub->output_has_begun
2501 || sub == coff_arm_hash_table (info->info)->bfd_of_glue_owner);
2505 coff_arm_final_link_postscript (bfd * abfd ATTRIBUTE_UNUSED,
2506 struct coff_final_link_info * pfinfo)
2508 struct coff_arm_link_hash_table * globals;
2510 globals = coff_arm_hash_table (pfinfo->info);
2512 BFD_ASSERT (globals != NULL);
2514 if (globals->bfd_of_glue_owner != NULL)
2516 if (! _bfd_coff_link_input_bfd (pfinfo, globals->bfd_of_glue_owner))
2519 globals->bfd_of_glue_owner->output_has_begun = TRUE;
2522 return bfd_arm_update_notes (abfd, ARM_NOTE_SECTION);
2525 #ifndef bfd_pe_print_pdata
2526 #define bfd_pe_print_pdata NULL
2529 #include "coffcode.h"
2531 #ifndef TARGET_LITTLE_SYM
2532 #define TARGET_LITTLE_SYM arm_coff_le_vec
2534 #ifndef TARGET_LITTLE_NAME
2535 #define TARGET_LITTLE_NAME "coff-arm-little"
2537 #ifndef TARGET_BIG_SYM
2538 #define TARGET_BIG_SYM arm_coff_be_vec
2540 #ifndef TARGET_BIG_NAME
2541 #define TARGET_BIG_NAME "coff-arm-big"
2544 #ifndef TARGET_UNDERSCORE
2545 #define TARGET_UNDERSCORE 0
2548 #ifndef EXTRA_S_FLAGS
2550 #define EXTRA_S_FLAGS (SEC_CODE | SEC_LINK_ONCE | SEC_LINK_DUPLICATES)
2552 #define EXTRA_S_FLAGS SEC_CODE
2556 /* Forward declaration for use initialising alternative_target field. */
2557 extern const bfd_target TARGET_BIG_SYM ;
2559 /* Target vectors. */
2560 CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_BIG_SYM, COFF_SWAP_TABLE)
2561 CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, EXTRA_S_FLAGS, TARGET_UNDERSCORE, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE)