diff options
Diffstat (limited to 'contrib/binutils/bfd/elf32-v850.c')
| -rw-r--r-- | contrib/binutils/bfd/elf32-v850.c | 1785 |
1 files changed, 1785 insertions, 0 deletions
diff --git a/contrib/binutils/bfd/elf32-v850.c b/contrib/binutils/bfd/elf32-v850.c new file mode 100644 index 000000000000..c66513a48e31 --- /dev/null +++ b/contrib/binutils/bfd/elf32-v850.c @@ -0,0 +1,1785 @@ +/* V850-specific support for 32-bit ELF + Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. + +This file is part of BFD, the Binary File Descriptor library. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + + + +/* XXX FIXME: This code is littered with 32bit int, 16bit short, 8bit char + dependencies. As is the gas & simulator code or the v850. */ + + +#include "bfd.h" +#include "sysdep.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/v850.h" + +/* sign-extend a 24-bit number */ +#define SEXT24(x) ((((x) & 0xffffff) ^ (~ 0x7fffff)) + 0x800000) + +static reloc_howto_type *v850_elf_reloc_type_lookup + PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); +static void v850_elf_info_to_howto_rel + PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); +static bfd_reloc_status_type v850_elf_reloc + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static boolean v850_elf_is_local_label_name PARAMS ((bfd *, const char *)); +static boolean v850_elf_relocate_section PARAMS((bfd *, + struct bfd_link_info *, + bfd *, + asection *, + bfd_byte *, + Elf_Internal_Rela *, + Elf_Internal_Sym *, + asection **)); +/* Try to minimize the amount of space occupied by relocation tables + on the ROM (not that the ROM won't be swamped by other ELF overhead). */ +#define USE_REL + +/* Note: It is REQUIRED that the 'type' value of each entry in this array + match the index of the entry in the array. */ +static reloc_howto_type v850_elf_howto_table[] = +{ + /* This reloc does nothing. */ + HOWTO (R_V850_NONE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_V850_NONE", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), /* pcrel_offset */ + + /* A PC relative 9 bit branch. */ + HOWTO (R_V850_9_PCREL, /* type */ + 2, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 26, /* bitsize */ + true, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_9_PCREL", /* name */ + false, /* partial_inplace */ + 0x00ffffff, /* src_mask */ + 0x00ffffff, /* dst_mask */ + true), /* pcrel_offset */ + + /* A PC relative 22 bit branch. */ + HOWTO (R_V850_22_PCREL, /* type */ + 2, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 22, /* bitsize */ + true, /* pc_relative */ + 7, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_22_PCREL", /* name */ + false, /* partial_inplace */ + 0x07ffff80, /* src_mask */ + 0x07ffff80, /* dst_mask */ + true), /* pcrel_offset */ + + /* High 16 bits of symbol value. */ + HOWTO (R_V850_HI16_S, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_HI16_S", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* High 16 bits of symbol value. */ + HOWTO (R_V850_HI16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_HI16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Low 16 bits of symbol value. */ + HOWTO (R_V850_LO16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_LO16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Simple 32bit reloc. */ + HOWTO (R_V850_32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_32", /* name */ + true, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Simple 16bit reloc. */ + HOWTO (R_V850_16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_V850_16", /* name */ + true, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* Simple 8bit reloc. */ + HOWTO (R_V850_8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_V850_8", /* name */ + true, /* partial_inplace */ + 0xff, /* src_mask */ + 0xff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit offset from the short data area pointer. */ + HOWTO (R_V850_SDA_16_16_OFFSET, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_SDA_16_16_OFFSET", /* name */ + false, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 15 bit offset from the short data area pointer. */ + HOWTO (R_V850_SDA_15_16_OFFSET, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 1, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_SDA_15_16_OFFSET", /* name */ + false, /* partial_inplace */ + 0xfffe, /* src_mask */ + 0xfffe, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit offset from the zero data area pointer. */ + HOWTO (R_V850_ZDA_16_16_OFFSET, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_ZDA_16_16_OFFSET", /* name */ + false, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xffff, /* dst_mask */ + false), /* pcrel_offset */ + + /* 15 bit offset from the zero data area pointer. */ + HOWTO (R_V850_ZDA_15_16_OFFSET, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 1, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_ZDA_15_16_OFFSET", /* name */ + false, /* partial_inplace */ + 0xfffe, /* src_mask */ + 0xfffe, /* dst_mask */ + false), /* pcrel_offset */ + + /* 6 bit offset from the tiny data area pointer. */ + HOWTO (R_V850_TDA_6_8_OFFSET, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 1, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_TDA_6_8_OFFSET", /* name */ + false, /* partial_inplace */ + 0x7e, /* src_mask */ + 0x7e, /* dst_mask */ + false), /* pcrel_offset */ + + /* 8 bit offset from the tiny data area pointer. */ + HOWTO (R_V850_TDA_7_8_OFFSET, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_TDA_7_8_OFFSET", /* name */ + false, /* partial_inplace */ + 0x7f, /* src_mask */ + 0x7f, /* dst_mask */ + false), /* pcrel_offset */ + + /* 7 bit offset from the tiny data area pointer. */ + HOWTO (R_V850_TDA_7_7_OFFSET, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 7, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_TDA_7_7_OFFSET", /* name */ + false, /* partial_inplace */ + 0x7f, /* src_mask */ + 0x7f, /* dst_mask */ + false), /* pcrel_offset */ + + /* 16 bit offset from the tiny data area pointer! */ + HOWTO (R_V850_TDA_16_16_OFFSET, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + false, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + v850_elf_reloc, /* special_function */ + "R_V850_TDA_16_16_OFFSET", /* name */ + false, /* partial_inplace */ + 0xffff, /* src_mask */ + 0xfff, /* dst_mask */ + false), /* pcrel_offset */ + +}; + +/* Map BFD reloc types to V850 ELF reloc types. */ + +struct v850_elf_reloc_map +{ + unsigned char bfd_reloc_val; + unsigned char elf_reloc_val; +}; + +static const struct v850_elf_reloc_map v850_elf_reloc_map[] = +{ + { BFD_RELOC_NONE, R_V850_NONE }, + { BFD_RELOC_V850_9_PCREL, R_V850_9_PCREL }, + { BFD_RELOC_V850_22_PCREL, R_V850_22_PCREL }, + { BFD_RELOC_HI16_S, R_V850_HI16_S }, + { BFD_RELOC_HI16, R_V850_HI16 }, + { BFD_RELOC_LO16, R_V850_LO16 }, + { BFD_RELOC_32, R_V850_32 }, + { BFD_RELOC_16, R_V850_16 }, + { BFD_RELOC_8, R_V850_8 }, + { BFD_RELOC_V850_SDA_16_16_OFFSET, R_V850_SDA_16_16_OFFSET }, + { BFD_RELOC_V850_SDA_15_16_OFFSET, R_V850_SDA_15_16_OFFSET }, + { BFD_RELOC_V850_ZDA_16_16_OFFSET, R_V850_ZDA_16_16_OFFSET }, + { BFD_RELOC_V850_ZDA_15_16_OFFSET, R_V850_ZDA_15_16_OFFSET }, + { BFD_RELOC_V850_TDA_6_8_OFFSET, R_V850_TDA_6_8_OFFSET }, + { BFD_RELOC_V850_TDA_7_8_OFFSET, R_V850_TDA_7_8_OFFSET }, + { BFD_RELOC_V850_TDA_7_7_OFFSET, R_V850_TDA_7_7_OFFSET }, + { BFD_RELOC_V850_TDA_16_16_OFFSET, R_V850_TDA_16_16_OFFSET }, +}; + + +/* Map a bfd relocation into the appropriate howto structure */ +static reloc_howto_type * +v850_elf_reloc_type_lookup (abfd, code) + bfd * abfd; + bfd_reloc_code_real_type code; +{ + unsigned int i; + + for (i = 0; + i < sizeof (v850_elf_reloc_map) / sizeof (struct v850_elf_reloc_map); + i++) + { + if (v850_elf_reloc_map[i].bfd_reloc_val == code) + { + BFD_ASSERT (v850_elf_howto_table[v850_elf_reloc_map[i].elf_reloc_val].type == v850_elf_reloc_map[i].elf_reloc_val); + + return & v850_elf_howto_table[v850_elf_reloc_map[i].elf_reloc_val]; + } + } + + return NULL; +} + + +/* Set the howto pointer for an V850 ELF reloc. */ +static void +v850_elf_info_to_howto_rel (abfd, cache_ptr, dst) + bfd * abfd; + arelent * cache_ptr; + Elf32_Internal_Rel * dst; +{ + unsigned int r_type; + + r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_V850_max); + cache_ptr->howto = &v850_elf_howto_table[r_type]; +} + + +/* Look through the relocs for a section during the first phase, and + allocate space in the global offset table or procedure linkage + table. */ + +static boolean +v850_elf_check_relocs (abfd, info, sec, relocs) + bfd * abfd; + struct bfd_link_info * info; + asection * sec; + const Elf_Internal_Rela * relocs; +{ + boolean ret = true; + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + asection *sreloc; + enum v850_reloc_type r_type; + int other = 0; + const char *common = (const char *)0; + + if (info->relocateable) + return true; + +#ifdef DEBUG + fprintf (stderr, "v850_elf_check_relocs called for section %s in %s\n", + bfd_get_section_name (abfd, sec), + bfd_get_filename (abfd)); +#endif + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + sreloc = NULL; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + r_type = (enum v850_reloc_type) ELF32_R_TYPE (rel->r_info); + switch (r_type) + { + default: + case R_V850_NONE: + case R_V850_9_PCREL: + case R_V850_22_PCREL: + case R_V850_HI16_S: + case R_V850_HI16: + case R_V850_LO16: + case R_V850_32: + case R_V850_16: + case R_V850_8: + break; + + case R_V850_SDA_16_16_OFFSET: + case R_V850_SDA_15_16_OFFSET: + other = V850_OTHER_SDA; + common = ".scommon"; + goto small_data_common; + + case R_V850_ZDA_16_16_OFFSET: + case R_V850_ZDA_15_16_OFFSET: + other = V850_OTHER_ZDA; + common = ".zcommon"; + goto small_data_common; + + case R_V850_TDA_6_8_OFFSET: + case R_V850_TDA_7_8_OFFSET: + case R_V850_TDA_7_7_OFFSET: + case R_V850_TDA_16_16_OFFSET: + other = V850_OTHER_TDA; + common = ".tcommon"; + /* fall through */ + +#define V850_OTHER_MASK (V850_OTHER_TDA | V850_OTHER_SDA | V850_OTHER_ZDA) + + small_data_common: + if (h) + { + h->other |= other; /* flag which type of relocation was used */ + if ((h->other & V850_OTHER_MASK) != (other & V850_OTHER_MASK) + && (h->other & V850_OTHER_ERROR) == 0) + { + const char * msg; + static char buff[100]; /* XXX */ + + switch (h->other & V850_OTHER_MASK) + { + default: + msg = "cannot occupy in multiple small data regions"; + break; + case V850_OTHER_SDA | V850_OTHER_ZDA | V850_OTHER_TDA: + msg = "can only be in one of the small, zero, and tiny data regions"; + break; + case V850_OTHER_SDA | V850_OTHER_ZDA: + msg = "cannot be in both small and zero data regions simultaneously"; + break; + case V850_OTHER_SDA | V850_OTHER_TDA: + msg = "cannot be in both small and tiny data regions simultaneously"; + break; + case V850_OTHER_ZDA | V850_OTHER_TDA: + msg = "cannot be in both zero and tiny data regions simultaneously"; + break; + } + + sprintf (buff, "Variable '%s' %s", h->root.root.string, msg ); + info->callbacks->warning (info, buff, h->root.root.string, + abfd, h->root.u.def.section, 0); + + bfd_set_error (bfd_error_bad_value); + h->other |= V850_OTHER_ERROR; + ret = false; + } + } + + if (h && h->root.type == bfd_link_hash_common + && h->root.u.c.p + && !strcmp (bfd_get_section_name (abfd, h->root.u.c.p->section), "COMMON")) + { + asection *section = h->root.u.c.p->section = bfd_make_section_old_way (abfd, common); + section->flags |= SEC_IS_COMMON; + } + +#ifdef DEBUG + fprintf (stderr, "v850_elf_check_relocs, found %s relocation for %s%s\n", + v850_elf_howto_table[ (int)r_type ].name, + (h && h->root.root.string) ? h->root.root.string : "<unknown>", + (h->root.type == bfd_link_hash_common) ? ", symbol is common" : ""); +#endif + break; + } + } + + return ret; +} + +typedef struct +{ + long addend; + bfd_byte * address; + unsigned long counter; +} +hi16s_location; + +static hi16s_location previous_hi16s[ 10 ]; /* XXX is this enough ? */ +static unsigned long hi16s_counter; + +static void +remember_hi16s_reloc (addend, address) + long addend; + bfd_byte * address; +{ + hi16s_location * oldest = NULL; + int i; + + /* Find a free slot. */ + for (i = sizeof (previous_hi16s) / sizeof (previous_hi16s[0]); i--;) + { + hi16s_location * entry = previous_hi16s + i; + + if (entry->addend == 0 && entry->address == 0) + { + /* Use this entry. */ + oldest = entry; + break; + } + + /* Remember the least recently added entry. */ + if (oldest == NULL || oldest->counter > entry->counter) + oldest = entry; + } + + oldest->addend = addend; + oldest->address = address; + oldest->counter = hi16s_counter ++; + + /* Cope with wrap around of our counter. */ + if (hi16s_counter == 0) + { + /* XXX - Assume that all counter entries differ only in their low 16 bits. */ + for (i = sizeof (previous_hi16s) / sizeof (previous_hi16s[0]); i--;) + { + hi16s_location * entry = previous_hi16s + i; + + entry->counter &= 0xffff; + } + + hi16s_counter = 0x10000; + } + + return; +} + +static bfd_byte * +find_remembered_hi16s_reloc (addend) + long addend; +{ + hi16s_location * match = NULL; + int i; + + /* Search the table. Record the most recent entry that matches. */ + for (i = sizeof (previous_hi16s) / sizeof (previous_hi16s[0]); i--;) + { + hi16s_location * entry = previous_hi16s + i; + + if (entry->addend == addend) + { + if (match == NULL || match->counter < entry->counter) + match = entry; + } + } + + if (match != NULL) + { + bfd_byte * addr; + + /* Empty the table entry. */ + match->addend = 0; + + addr = match->address; + match->address = NULL; + + return addr; + } + + return NULL; +} + +static bfd_reloc_status_type +v850_elf_store_addend_in_insn (abfd, r_type, addend, address, replace) + bfd * abfd; + int r_type; + long addend; + bfd_byte * address; + boolean replace; +{ + unsigned long insn; + + switch (r_type) + { + default: + /* fprintf (stderr, "reloc type %d not SUPPORTED\n", r_type ); */ + return bfd_reloc_notsupported; + + case R_V850_32: + if (! replace) + addend += bfd_get_32 (abfd, address); + + bfd_put_32 (abfd, addend, address); + return bfd_reloc_ok; + + case R_V850_22_PCREL: + if (addend > 0x1fffff || addend < -0x200000) + return bfd_reloc_overflow; + + if ((addend % 2) != 0) + return bfd_reloc_dangerous; + + insn = bfd_get_32 (abfd, address); + insn &= ~0xfffe003f; + insn |= (((addend & 0xfffe) << 16) | ((addend & 0x3f0000) >> 16)); + bfd_put_32 (abfd, insn, address); + return bfd_reloc_ok; + + case R_V850_9_PCREL: + if (addend > 0xff || addend < -0x100) + return bfd_reloc_overflow; + + if ((addend % 2) != 0) + return bfd_reloc_dangerous; + + insn = bfd_get_16 (abfd, address); + insn &= ~ 0xf870; + insn |= ((addend & 0x1f0) << 7) | ((addend & 0x0e) << 3); + break; + + case R_V850_HI16: + addend += (bfd_get_16 (abfd, address) << 16); + addend = (addend >> 16); + insn = addend; + break; + + case R_V850_HI16_S: + /* Remember where this relocation took place. */ + remember_hi16s_reloc (addend, address); + + addend += (bfd_get_16 (abfd, address) << 16); + addend = (addend >> 16) + ((addend & 0x8000) != 0); + + /* This relocation cannot overflow. */ + if (addend > 0x7fff || addend < -0x8000) + addend = 0; + + insn = addend; + break; + + case R_V850_LO16: + /* Calculate the sum of the value stored in the instruction and the + addend and check for overflow from the low 16 bits into the high + 16 bits. The assembler has already done some of this: If the + value stored in the instruction has its 15th bit set, (counting + from zero) then the assembler will have added 1 to the value + stored in the associated HI16S reloc. So for example, these + relocations: + + movhi hi( fred ), r0, r1 + movea lo( fred ), r1, r1 + + will store 0 in the value fields for the MOVHI and MOVEA instructions + and addend will be the address of fred, but for these instructions: + + movhi hi( fred + 0x123456), r0, r1 + movea lo( fred + 0x123456), r1, r1 + + the value stored in the MOVHI instruction will be 0x12 and the value + stored in the MOVEA instruction will be 0x3456. If however the + instructions were: + + movhi hi( fred + 0x10ffff), r0, r1 + movea lo( fred + 0x10ffff), r1, r1 + + then the value stored in the MOVHI instruction would be 0x11 (not + 0x10) and the value stored in the MOVEA instruction would be 0xffff. + Thus (assuming for the moment that the addend is 0), at run time the + MOVHI instruction loads 0x110000 into r1, then the MOVEA instruction + adds 0xffffffff (sign extension!) producing 0x10ffff. Similarly if + the instructions were: + + movhi hi( fred - 1), r0, r1 + movea lo( fred - 1), r1, r1 + + then 0 is stored in the MOVHI instruction and -1 is stored in the + MOVEA instruction. + + Overflow can occur if the addition of the value stored in the + instruction plus the addend sets the 15th bit when before it was clear. + This is because the 15th bit will be sign extended into the high part, + thus reducing its value by one, but since the 15th bit was originally + clear, the assembler will not have added 1 to the previous HI16S reloc + to compensate for this effect. For example: + + movhi hi( fred + 0x123456), r0, r1 + movea lo( fred + 0x123456), r1, r1 + + The value stored in HI16S reloc is 0x12, the value stored in the LO16 + reloc is 0x3456. If we assume that the address of fred is 0x00007000 + then the relocations become: + + HI16S: 0x0012 + (0x00007000 >> 16) = 0x12 + LO16: 0x3456 + (0x00007000 & 0xffff) = 0xa456 + + but when the instructions are executed, the MOVEA instruction's value + is signed extended, so the sum becomes: + + 0x00120000 + + 0xffffa456 + ------------ + 0x0011a456 but 'fred + 0x123456' = 0x0012a456 + + Note that if the 15th bit was set in the value stored in the LO16 + reloc, then we do not have to do anything: + + movhi hi( fred + 0x10ffff), r0, r1 + movea lo( fred + 0x10ffff), r1, r1 + + HI16S: 0x0011 + (0x00007000 >> 16) = 0x11 + LO16: 0xffff + (0x00007000 & 0xffff) = 0x6fff + + 0x00110000 + + 0x00006fff + ------------ + 0x00116fff = fred + 0x10ffff = 0x7000 + 0x10ffff + + + Overflow can also occur if the computation carries into the 16th bit + and it also results in the 15th bit having the same value as the 15th + bit of the original value. What happens is that the HI16S reloc + will have already examined the 15th bit of the original value and + added 1 to the high part if the bit is set. This compensates for the + sign extension of 15th bit of the result of the computation. But now + there is a carry into the 16th bit, and this has not been allowed for. + + So, for example if fred is at address 0xf000: + + movhi hi( fred + 0xffff), r0, r1 [bit 15 of the offset is set] + movea lo( fred + 0xffff), r1, r1 + + HI16S: 0x0001 + (0x0000f000 >> 16) = 0x0001 + LO16: 0xffff + (0x0000f000 & 0xffff) = 0xefff (carry into bit 16 is lost) + + 0x00010000 + + 0xffffefff + ------------ + 0x0000efff but 'fred + 0xffff' = 0x0001efff + + Similarly, if the 15th bit remains clear, but overflow occurs into + the 16th bit then (assuming the address of fred is 0xf000): + + movhi hi( fred + 0x7000), r0, r1 [bit 15 of the offset is clear] + movea lo( fred + 0x7000), r1, r1 + + HI16S: 0x0000 + (0x0000f000 >> 16) = 0x0000 + LO16: 0x7000 + (0x0000f000 & 0xffff) = 0x6fff (carry into bit 16 is lost) + + 0x00000000 + + 0x00006fff + ------------ + 0x00006fff but 'fred + 0x7000' = 0x00016fff + + Note - there is no need to change anything if a carry occurs, and the + 15th bit changes its value from being set to being clear, as the HI16S + reloc will have already added in 1 to the high part for us: + + movhi hi( fred + 0xffff), r0, r1 [bit 15 of the offset is set] + movea lo( fred + 0xffff), r1, r1 + + HI16S: 0x0001 + (0x00007000 >> 16) + LO16: 0xffff + (0x00007000 & 0xffff) = 0x6fff (carry into bit 16 is lost) + + 0x00010000 + + 0x00006fff (bit 15 not set, so the top half is zero) + ------------ + 0x00016fff which is right (assuming that fred is at 0x7000) + + but if the 15th bit goes from being clear to being set, then we must + once again handle overflow: + + movhi hi( fred + 0x7000), r0, r1 [bit 15 of the offset is clear] + movea lo( fred + 0x7000), r1, r1 + + HI16S: 0x0000 + (0x0000ffff >> 16) + LO16: 0x7000 + (0x0000ffff & 0xffff) = 0x6fff (carry into bit 16) + + 0x00000000 + + 0x00006fff (bit 15 not set, so the top half is zero) + ------------ + 0x00006fff which is wrong (assuming that fred is at 0xffff) + */ + + { + long result; + + insn = bfd_get_16 (abfd, address); + result = insn + addend; + +#define BIT15_SET(x) ((x) & 0x8000) +#define OVERFLOWS(a,i) ((((a) & 0xffff) + (i)) > 0xffff) + + if ((BIT15_SET (result) && ! BIT15_SET (addend)) + || (OVERFLOWS (addend, insn) + && ((! BIT15_SET (insn)) || (BIT15_SET (addend))))) + { + bfd_byte * hi16s_address = find_remembered_hi16s_reloc (addend); + + /* Amend the matching HI16_S relocation. */ + if (hi16s_address != NULL) + { + insn = bfd_get_16 (abfd, hi16s_address); + insn += 1; + bfd_put_16 (abfd, insn, hi16s_address); + } + else + { + fprintf (stderr, "FAILED to find previous HI16 reloc\n"); + return bfd_reloc_overflow; + } + } + + /* Do not complain if value has top bit set, as this has been anticipated. */ + insn = result & 0xffff; + break; + } + + case R_V850_8: + if (! replace) + addend += (char) bfd_get_8 (abfd, address); + + if (addend > 0x7f || addend < -0x80) + return bfd_reloc_overflow; + + bfd_put_8 (abfd, addend, address); + return bfd_reloc_ok; + + + case R_V850_16: + replace = false; + /* drop through */ + case R_V850_SDA_16_16_OFFSET: + case R_V850_ZDA_16_16_OFFSET: + case R_V850_TDA_16_16_OFFSET: + if (! replace) + addend += bfd_get_16 (abfd, address); + + if (addend > 0x7fff || addend < -0x8000) + return bfd_reloc_overflow; + + insn = addend; + break; + + case R_V850_SDA_15_16_OFFSET: + case R_V850_ZDA_15_16_OFFSET: + insn = bfd_get_16 (abfd, address); + + if (! replace) + addend += (insn & 0xfffe); + + if (addend > 0x7ffe || addend < -0x8000) + return bfd_reloc_overflow; + + if (addend & 1) + return bfd_reloc_dangerous; + + insn = (addend & ~1) | (insn & 1); + break; + + case R_V850_TDA_6_8_OFFSET: + insn = bfd_get_16 (abfd, address); + + if (! replace) + addend += ((insn & 0x7e) << 1); + + if (addend > 0xfc || addend < 0) + return bfd_reloc_overflow; + + if (addend & 3) + return bfd_reloc_dangerous; + + insn &= 0xff81; + insn |= (addend >> 1); + break; + + case R_V850_TDA_7_8_OFFSET: + insn = bfd_get_16 (abfd, address); + + if (! replace) + addend += ((insn & 0x7f) << 1); + + if (addend > 0xfe || addend < 0) + return bfd_reloc_overflow; + + if (addend & 1) + return bfd_reloc_dangerous; + + insn &= 0xff80; + insn |= (addend >> 1); + break; + + case R_V850_TDA_7_7_OFFSET: + insn = bfd_get_16 (abfd, address); + + if (! replace) + addend += insn & 0x7f; + + if (addend > 0x7f || addend < 0) + return bfd_reloc_overflow; + + insn &= 0xff80; + insn |= addend; + break; + + } + + bfd_put_16 (abfd, insn, address); + return bfd_reloc_ok; +} + + +/* Insert the addend into the instruction. */ +static bfd_reloc_status_type +v850_elf_reloc (abfd, reloc, symbol, data, isection, obfd, err) + bfd * abfd; + arelent * reloc; + asymbol * symbol; + PTR data; + asection * isection; + bfd * obfd; + char ** err; +{ + long relocation; + + /* If there is an output BFD, + and the symbol is not a section name (which is only defined at final link time), + and either we are not putting the addend into the instruction + or the addend is zero, so there is nothing to add into the instruction + then just fixup the address and return. */ + if (obfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && (! reloc->howto->partial_inplace + || reloc->addend == 0)) + { + reloc->address += isection->output_offset; + return bfd_reloc_ok; + } +#if 0 + else if (obfd != NULL) + { + return bfd_reloc_continue; + } +#endif + + /* Catch relocs involving undefined symbols. */ + if (bfd_is_und_section (symbol->section) + && (symbol->flags & BSF_WEAK) == 0 + && obfd == NULL) + return bfd_reloc_undefined; + + /* We handle final linking of some relocs ourselves. */ + + /* Is the address of the relocation really within the section? */ + if (reloc->address > isection->_cooked_size) + return bfd_reloc_outofrange; + + /* Work out which section the relocation is targetted at and the + initial relocation command value. */ + + /* Get symbol value. (Common symbols are special.) */ + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + /* Convert input-section-relative symbol value to absolute + addend. */ + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + relocation += reloc->addend; + + if (reloc->howto->pc_relative == true) + { + /* Here the variable relocation holds the final address of the + symbol we are relocating against, plus any addend. */ + relocation -= isection->output_section->vma + isection->output_offset; + + /* Deal with pcrel_offset */ + relocation -= reloc->address; + } + + /* I've got no clue... */ + reloc->addend = 0; + + return v850_elf_store_addend_in_insn (abfd, reloc->howto->type, relocation, + (bfd_byte *) data + reloc->address, true); +} + + +/*ARGSUSED*/ +static boolean +v850_elf_is_local_label_name (abfd, name) + bfd * abfd; + const char * name; +{ + return ( (name[0] == '.' && (name[1] == 'L' || name[1] == '.')) + || (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_')); +} + + +/* Perform a relocation as part of a final link. */ +static bfd_reloc_status_type +v850_elf_final_link_relocate (howto, input_bfd, output_bfd, + input_section, contents, offset, value, + addend, info, sym_sec, is_local) + reloc_howto_type * howto; + bfd * input_bfd; + bfd * output_bfd; + asection * input_section; + bfd_byte * contents; + bfd_vma offset; + bfd_vma value; + bfd_vma addend; + struct bfd_link_info * info; + asection * sym_sec; + int is_local; +{ + unsigned long r_type = howto->type; + bfd_byte * hit_data = contents + offset; + + /* Adjust the value according to the relocation. */ + switch (r_type) + { + case R_V850_9_PCREL: + value -= (input_section->output_section->vma + + input_section->output_offset); + value -= offset; + break; + + case R_V850_22_PCREL: + value -= (input_section->output_section->vma + + input_section->output_offset + + offset); + + value = SEXT24 (value); /* Only the bottom 24 bits of the PC are valid */ + break; + + case R_V850_HI16_S: + case R_V850_HI16: + case R_V850_LO16: + case R_V850_16: + case R_V850_32: + case R_V850_8: + break; + + case R_V850_ZDA_15_16_OFFSET: + case R_V850_ZDA_16_16_OFFSET: + if (sym_sec == NULL) + return bfd_reloc_undefined; + + value -= sym_sec->output_section->vma; + break; + + case R_V850_SDA_15_16_OFFSET: + case R_V850_SDA_16_16_OFFSET: + { + unsigned long gp; + struct bfd_link_hash_entry * h; + + if (sym_sec == NULL) + return bfd_reloc_undefined; + + /* Get the value of __gp. */ + h = bfd_link_hash_lookup (info->hash, "__gp", false, false, true); + if (h == (struct bfd_link_hash_entry *) NULL + || h->type != bfd_link_hash_defined) + return bfd_reloc_other; + + gp = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + + value -= sym_sec->output_section->vma; + value -= (gp - sym_sec->output_section->vma); + } + break; + + case R_V850_TDA_16_16_OFFSET: + case R_V850_TDA_7_7_OFFSET: + case R_V850_TDA_7_8_OFFSET: + case R_V850_TDA_6_8_OFFSET: + { + unsigned long ep; + struct bfd_link_hash_entry * h; + + /* Get the value of __ep. */ + h = bfd_link_hash_lookup (info->hash, "__ep", false, false, true); + if (h == (struct bfd_link_hash_entry *) NULL + || h->type != bfd_link_hash_defined) + return bfd_reloc_continue; /* Actually this indicates that __ep could not be found. */ + + ep = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + + value -= ep; + } + break; + + + case R_V850_NONE: + return bfd_reloc_ok; + + default: + return bfd_reloc_notsupported; + } + + /* Perform the relocation. */ + return v850_elf_store_addend_in_insn (input_bfd, r_type, value, hit_data, false); +} + + +/* Relocate an V850 ELF section. */ +static boolean +v850_elf_relocate_section (output_bfd, info, input_bfd, input_section, + contents, relocs, local_syms, local_sections) + bfd * output_bfd; + struct bfd_link_info * info; + bfd * input_bfd; + asection * input_section; + bfd_byte * contents; + Elf_Internal_Rela * relocs; + Elf_Internal_Sym * local_syms; + asection ** local_sections; +{ + Elf_Internal_Shdr * symtab_hdr; + struct elf_link_hash_entry ** sym_hashes; + Elf_Internal_Rela * rel; + Elf_Internal_Rela * relend; + + symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type * howto; + unsigned long r_symndx; + Elf_Internal_Sym * sym; + asection * sec; + struct elf_link_hash_entry * h; + bfd_vma relocation; + bfd_reloc_status_type r; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + howto = v850_elf_howto_table + r_type; + + if (info->relocateable) + { + /* This is a relocateable link. We don't have to change + anything, unless the reloc is against a section symbol, + in which case we have to adjust according to where the + section symbol winds up in the output section. */ + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) + { + sec = local_sections[r_symndx]; +#ifdef USE_REL + /* The Elf_Internal_Rel structure does not have space for the + modified addend value, so we store it in the instruction + instead. */ + + if (sec->output_offset + sym->st_value != 0) + { + if (v850_elf_store_addend_in_insn (input_bfd, r_type, + sec->output_offset + + sym->st_value, + contents + rel->r_offset, + false) + != bfd_reloc_ok) + { + info->callbacks->warning + (info, + "Unable to handle relocation during incremental link", + NULL, input_bfd, input_section, rel->r_offset); + } + } +#else + rel->r_addend += sec->output_offset + sym->st_value; +#endif + } + } + + continue; + } + + /* This is a final link. */ + h = NULL; + sym = NULL; + sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); +#if 0 + { + char * name; + name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name); + name = (name == NULL) ? "<none>" : name; +fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", + sec->name, name, sym->st_name, + sec->output_section->vma, sec->output_offset, sym->st_value, rel->r_addend); + } +#endif + } + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); +#if 0 +fprintf (stderr, "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", + sec->name, h->root.root.string, h->root.u.def.value, sec->output_section->vma, sec->output_offset, relocation); +#endif + } + else if (h->root.type == bfd_link_hash_undefweak) + { +#if 0 +fprintf (stderr, "undefined: sec: %s, name: %s\n", + sec->name, h->root.root.string); +#endif + relocation = 0; + } + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset))) + return false; +#if 0 +fprintf (stderr, "unknown: name: %s\n", h->root.root.string); +#endif + relocation = 0; + } + } + + /* FIXME: We should use the addend, but the COFF relocations + don't. */ + r = v850_elf_final_link_relocate (howto, input_bfd, output_bfd, + input_section, + contents, rel->r_offset, + relocation, rel->r_addend, + info, sec, h == NULL); + + if (r != bfd_reloc_ok) + { + const char * name; + const char * msg = (const char *)0; + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + switch (r) + { + case bfd_reloc_overflow: + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + break; + + case bfd_reloc_undefined: + if (! ((*info->callbacks->undefined_symbol) + (info, name, input_bfd, input_section, + rel->r_offset))) + return false; + break; + + case bfd_reloc_outofrange: + msg = "internal error: out of range error"; + goto common_error; + + case bfd_reloc_notsupported: + msg = "internal error: unsupported relocation error"; + goto common_error; + + case bfd_reloc_dangerous: + msg = "internal error: dangerous relocation"; + goto common_error; + + case bfd_reloc_other: + msg = "could not locate special linker symbol __gp"; + goto common_error; + + case bfd_reloc_continue: + msg = "could not locate special linker symbol __ep"; + goto common_error; + + case (bfd_reloc_dangerous + 1): + msg = "could not locate special linker symbol __ctbp"; + goto common_error; + + default: + msg = "internal error: unknown error"; + /* fall through */ + + common_error: + if (!((*info->callbacks->warning) + (info, msg, name, input_bfd, input_section, + rel->r_offset))) + return false; + break; + } + } + } + + return true; +} + +/* Set the right machine number. */ +static boolean +v850_elf_object_p (abfd) + bfd *abfd; +{ + switch (elf_elfheader (abfd)->e_flags & EF_V850_ARCH) + { + default: + case E_V850_ARCH: (void) bfd_default_set_arch_mach (abfd, bfd_arch_v850, 0); break; + } + return true; +} + +/* Store the machine number in the flags field. */ +void +v850_elf_final_write_processing (abfd, linker) + bfd * abfd; + boolean linker; +{ + unsigned long val; + + switch (bfd_get_mach (abfd)) + { + default: + case 0: val = E_V850_ARCH; break; + } + + elf_elfheader (abfd)->e_flags &=~ EF_V850_ARCH; + elf_elfheader (abfd)->e_flags |= val; +} + +/* Function to keep V850 specific file flags. */ +boolean +v850_elf_set_private_flags (abfd, flags) + bfd * abfd; + flagword flags; +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = true; + return true; +} + +/* Copy backend specific data from one object module to another */ +boolean +v850_elf_copy_private_bfd_data (ibfd, obfd) + bfd * ibfd; + bfd * obfd; +{ + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return true; + + BFD_ASSERT (!elf_flags_init (obfd) + || (elf_elfheader (obfd)->e_flags + == elf_elfheader (ibfd)->e_flags)); + + elf_gp (obfd) = elf_gp (ibfd); + elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; + elf_flags_init (obfd) = true; + return true; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ +boolean +v850_elf_merge_private_bfd_data (ibfd, obfd) + bfd * ibfd; + bfd * obfd; +{ + flagword out_flags; + flagword in_flags; + + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return true; + + in_flags = elf_elfheader (ibfd)->e_flags; + out_flags = elf_elfheader (obfd)->e_flags; + + if (! elf_flags_init (obfd)) + { + /* If the input is the default architecture then do not + bother setting the flags for the output architecture, + instead allow future merges to do this. If no future + merges ever set these flags then they will retain their + unitialised values, which surprise surprise, correspond + to the default values. */ + if (bfd_get_arch_info (ibfd)->the_default) + return true; + + elf_flags_init (obfd) = true; + elf_elfheader (obfd)->e_flags = in_flags; + + if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) + && bfd_get_arch_info (obfd)->the_default) + { + return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); + } + + return true; + } + + /* Check flag compatibility. */ + if (in_flags == out_flags) + return true; + + if ((in_flags & EF_V850_ARCH) != (out_flags & EF_V850_ARCH) + && (in_flags & EF_V850_ARCH) != E_V850_ARCH) + _bfd_error_handler ("%s: Architecture mismatch with previous modules", + bfd_get_filename (ibfd)); + + return true; +} +/* Display the flags field */ + +static boolean +v850_elf_print_private_bfd_data (abfd, ptr) + bfd * abfd; + PTR ptr; +{ + FILE * file = (FILE *) ptr; + + BFD_ASSERT (abfd != NULL && ptr != NULL) + + fprintf (file, "private flags = %lx", elf_elfheader (abfd)->e_flags); + + switch (elf_elfheader (abfd)->e_flags & EF_V850_ARCH) + { + default: + case E_V850_ARCH: fprintf (file, ": v850 architecture"); break; + } + + fputc ('\n', file); + + return true; +} + +/* V850 ELF uses four common sections. One is the usual one, and the + others are for (small) objects in one of the special data areas: + small, tiny and zero. All the objects are kept together, and then + referenced via the gp register, the ep register or the r0 register + respectively, which yields smaller, faster assembler code. This + approach is copied from elf32-mips.c. */ + +static asection v850_elf_scom_section; +static asymbol v850_elf_scom_symbol; +static asymbol * v850_elf_scom_symbol_ptr; +static asection v850_elf_tcom_section; +static asymbol v850_elf_tcom_symbol; +static asymbol * v850_elf_tcom_symbol_ptr; +static asection v850_elf_zcom_section; +static asymbol v850_elf_zcom_symbol; +static asymbol * v850_elf_zcom_symbol_ptr; + + +/* Given a BFD section, try to locate the corresponding ELF section + index. */ + +static boolean +v850_elf_section_from_bfd_section (abfd, hdr, sec, retval) + bfd * abfd; + Elf32_Internal_Shdr * hdr; + asection * sec; + int * retval; +{ + if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0) + { + *retval = SHN_V850_SCOMMON; + return true; + } + if (strcmp (bfd_get_section_name (abfd, sec), ".tcommon") == 0) + { + *retval = SHN_V850_TCOMMON; + return true; + } + if (strcmp (bfd_get_section_name (abfd, sec), ".zcommon") == 0) + { + *retval = SHN_V850_ZCOMMON; + return true; + } + return false; +} + +/* Handle the special V850 section numbers that a symbol may use. */ + +static void +v850_elf_symbol_processing (abfd, asym) + bfd * abfd; + asymbol * asym; +{ + elf_symbol_type * elfsym = (elf_symbol_type *) asym; + + switch (elfsym->internal_elf_sym.st_shndx) + { + case SHN_V850_SCOMMON: + if (v850_elf_scom_section.name == NULL) + { + /* Initialize the small common section. */ + v850_elf_scom_section.name = ".scommon"; + v850_elf_scom_section.flags = SEC_IS_COMMON | SEC_ALLOC | SEC_DATA; + v850_elf_scom_section.output_section = & v850_elf_scom_section; + v850_elf_scom_section.symbol = & v850_elf_scom_symbol; + v850_elf_scom_section.symbol_ptr_ptr = & v850_elf_scom_symbol_ptr; + v850_elf_scom_symbol.name = ".scommon"; + v850_elf_scom_symbol.flags = BSF_SECTION_SYM; + v850_elf_scom_symbol.section = & v850_elf_scom_section; + v850_elf_scom_symbol_ptr = & v850_elf_scom_symbol; + } + asym->section = & v850_elf_scom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + + case SHN_V850_TCOMMON: + if (v850_elf_tcom_section.name == NULL) + { + /* Initialize the tcommon section. */ + v850_elf_tcom_section.name = ".tcommon"; + v850_elf_tcom_section.flags = SEC_IS_COMMON; + v850_elf_tcom_section.output_section = & v850_elf_tcom_section; + v850_elf_tcom_section.symbol = & v850_elf_tcom_symbol; + v850_elf_tcom_section.symbol_ptr_ptr = & v850_elf_tcom_symbol_ptr; + v850_elf_tcom_symbol.name = ".tcommon"; + v850_elf_tcom_symbol.flags = BSF_SECTION_SYM; + v850_elf_tcom_symbol.section = & v850_elf_tcom_section; + v850_elf_tcom_symbol_ptr = & v850_elf_tcom_symbol; + } + asym->section = & v850_elf_tcom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + + case SHN_V850_ZCOMMON: + if (v850_elf_zcom_section.name == NULL) + { + /* Initialize the zcommon section. */ + v850_elf_zcom_section.name = ".zcommon"; + v850_elf_zcom_section.flags = SEC_IS_COMMON; + v850_elf_zcom_section.output_section = & v850_elf_zcom_section; + v850_elf_zcom_section.symbol = & v850_elf_zcom_symbol; + v850_elf_zcom_section.symbol_ptr_ptr = & v850_elf_zcom_symbol_ptr; + v850_elf_zcom_symbol.name = ".zcommon"; + v850_elf_zcom_symbol.flags = BSF_SECTION_SYM; + v850_elf_zcom_symbol.section = & v850_elf_zcom_section; + v850_elf_zcom_symbol_ptr = & v850_elf_zcom_symbol; + } + asym->section = & v850_elf_zcom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + } +} + +/* Hook called by the linker routine which adds symbols from an object + file. We must handle the special MIPS section numbers here. */ + +/*ARGSUSED*/ +static boolean +v850_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) + bfd * abfd; + struct bfd_link_info * info; + const Elf_Internal_Sym * sym; + const char ** namep; + flagword * flagsp; + asection ** secp; + bfd_vma * valp; +{ + switch (sym->st_shndx) + { + case SHN_V850_SCOMMON: + *secp = bfd_make_section_old_way (abfd, ".scommon"); + (*secp)->flags |= SEC_IS_COMMON; + *valp = sym->st_size; + break; + + case SHN_V850_TCOMMON: + *secp = bfd_make_section_old_way (abfd, ".tcommon"); + (*secp)->flags |= SEC_IS_COMMON; + *valp = sym->st_size; + break; + + case SHN_V850_ZCOMMON: + *secp = bfd_make_section_old_way (abfd, ".zcommon"); + (*secp)->flags |= SEC_IS_COMMON; + *valp = sym->st_size; + break; + } + + return true; +} + +/*ARGSIGNORED*/ +static boolean +v850_elf_link_output_symbol_hook (abfd, info, name, sym, input_sec) + bfd * abfd; + struct bfd_link_info * info; + const char * name; + Elf_Internal_Sym * sym; + asection * input_sec; +{ + /* If we see a common symbol, which implies a relocatable link, then + if a symbol was in a special common section in an input file, mark + it as a special common in the output file. */ + + if (sym->st_shndx == SHN_COMMON) + { + if (strcmp (input_sec->name, ".scommon") == 0) + sym->st_shndx = SHN_V850_SCOMMON; + else if (strcmp (input_sec->name, ".tcommon") == 0) + sym->st_shndx = SHN_V850_TCOMMON; + else if (strcmp (input_sec->name, ".zcommon") == 0) + sym->st_shndx = SHN_V850_ZCOMMON; + } + + return true; +} + +static boolean +v850_elf_section_from_shdr (abfd, hdr, name) + bfd * abfd; + Elf_Internal_Shdr * hdr; + char * name; +{ + /* There ought to be a place to keep ELF backend specific flags, but + at the moment there isn't one. We just keep track of the + sections by their name, instead. */ + + if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name)) + return false; + + switch (hdr->sh_type) + { + case SHT_V850_SCOMMON: + case SHT_V850_TCOMMON: + case SHT_V850_ZCOMMON: + if (! bfd_set_section_flags (abfd, hdr->bfd_section, + (bfd_get_section_flags (abfd, + hdr->bfd_section) + | SEC_IS_COMMON))) + return false; + } + + return true; +} + +/* Set the correct type for a V850 ELF section. We do this by the + section name, which is a hack, but ought to work. */ +static boolean +v850_elf_fake_sections (abfd, hdr, sec) + bfd * abfd; + Elf32_Internal_Shdr * hdr; + asection * sec; +{ + register const char * name; + + name = bfd_get_section_name (abfd, sec); + + if (strcmp (name, ".scommon") == 0) + { + hdr->sh_type = SHT_V850_SCOMMON; + } + else if (strcmp (name, ".tcommon") == 0) + { + hdr->sh_type = SHT_V850_TCOMMON; + } + else if (strcmp (name, ".zcommon") == 0) + hdr->sh_type = SHT_V850_ZCOMMON; + + return true; +} + + + +#define TARGET_LITTLE_SYM bfd_elf32_v850_vec +#define TARGET_LITTLE_NAME "elf32-v850" +#define ELF_ARCH bfd_arch_v850 +#define ELF_MACHINE_CODE EM_CYGNUS_V850 +#define ELF_MAXPAGESIZE 0x1000 + +#define elf_info_to_howto 0 +#define elf_info_to_howto_rel v850_elf_info_to_howto_rel + +#define elf_backend_check_relocs v850_elf_check_relocs +#define elf_backend_relocate_section v850_elf_relocate_section +#define elf_backend_object_p v850_elf_object_p +#define elf_backend_final_write_processing v850_elf_final_write_processing +#define elf_backend_section_from_bfd_section v850_elf_section_from_bfd_section +#define elf_backend_symbol_processing v850_elf_symbol_processing +#define elf_backend_add_symbol_hook v850_elf_add_symbol_hook +#define elf_backend_link_output_symbol_hook v850_elf_link_output_symbol_hook +#define elf_backend_section_from_shdr v850_elf_section_from_shdr +#define elf_backend_fake_sections v850_elf_fake_sections + +#define bfd_elf32_bfd_is_local_label_name v850_elf_is_local_label_name +#define bfd_elf32_bfd_reloc_type_lookup v850_elf_reloc_type_lookup +#define bfd_elf32_bfd_copy_private_bfd_data v850_elf_copy_private_bfd_data +#define bfd_elf32_bfd_merge_private_bfd_data v850_elf_merge_private_bfd_data +#define bfd_elf32_bfd_set_private_flags v850_elf_set_private_flags +#define bfd_elf32_bfd_print_private_bfd_data v850_elf_print_private_bfd_data + +#define elf_symbol_leading_char '_' + +#include "elf32-target.h" |