| /* BFD back-end for AMD 29000 COFF binaries. |
| Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002 |
| Free Software Foundation, Inc. |
| Contributed by David Wood at New York University 7/8/91. |
| |
| 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. */ |
| |
| #define A29K 1 |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "libbfd.h" |
| #include "coff/a29k.h" |
| #include "coff/internal.h" |
| #include "libcoff.h" |
| |
| static long get_symbol_value PARAMS ((asymbol *)); |
| static bfd_reloc_status_type a29k_reloc |
| PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); |
| static bfd_boolean coff_a29k_relocate_section |
| PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| struct internal_reloc *, struct internal_syment *, asection **)); |
| static bfd_boolean coff_a29k_adjust_symndx |
| PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, |
| struct internal_reloc *, bfd_boolean *)); |
| static void reloc_processing |
| PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *)); |
| |
| #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2) |
| |
| #define INSERT_HWORD(WORD,HWORD) \ |
| (((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff)) |
| #define EXTRACT_HWORD(WORD) \ |
| ((((WORD) & 0x00ff0000) >> 8) | ((WORD) & 0xff)) |
| #define SIGN_EXTEND_HWORD(HWORD) \ |
| (((HWORD) ^ 0x8000) - 0x8000) |
| |
| /* Provided the symbol, returns the value reffed. */ |
| |
| static long |
| get_symbol_value (symbol) |
| asymbol *symbol; |
| { |
| long relocation = 0; |
| |
| if (bfd_is_com_section (symbol->section)) |
| relocation = 0; |
| else |
| relocation = symbol->value + |
| symbol->section->output_section->vma + |
| symbol->section->output_offset; |
| |
| return relocation; |
| } |
| |
| /* This function is in charge of performing all the 29k relocations. */ |
| |
| static bfd_reloc_status_type |
| a29k_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd, |
| error_message) |
| bfd *abfd; |
| arelent *reloc_entry; |
| asymbol *symbol_in; |
| PTR data; |
| asection *input_section; |
| bfd *output_bfd; |
| char **error_message; |
| { |
| /* The consth relocation comes in two parts, we have to remember |
| the state between calls, in these variables. */ |
| static bfd_boolean part1_consth_active = FALSE; |
| static unsigned long part1_consth_value; |
| unsigned long insn; |
| unsigned long sym_value; |
| unsigned long unsigned_value; |
| unsigned short r_type; |
| long signed_value; |
| unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/ |
| bfd_byte *hit_data =addr + (bfd_byte *) (data); |
| |
| r_type = reloc_entry->howto->type; |
| |
| if (output_bfd) |
| { |
| /* Partial linking - do nothing. */ |
| reloc_entry->address += input_section->output_offset; |
| return bfd_reloc_ok; |
| } |
| |
| if (symbol_in != NULL |
| && bfd_is_und_section (symbol_in->section)) |
| { |
| /* Keep the state machine happy in case we're called again. */ |
| if (r_type == R_IHIHALF) |
| { |
| part1_consth_active = TRUE; |
| part1_consth_value = 0; |
| } |
| return bfd_reloc_undefined; |
| } |
| |
| if ((part1_consth_active) && (r_type != R_IHCONST)) |
| { |
| part1_consth_active = FALSE; |
| *error_message = (char *) _("Missing IHCONST"); |
| |
| return bfd_reloc_dangerous; |
| } |
| |
| sym_value = get_symbol_value(symbol_in); |
| |
| switch (r_type) |
| { |
| case R_IREL: |
| insn = bfd_get_32 (abfd, hit_data); |
| /* Take the value in the field and sign extend it. */ |
| signed_value = EXTRACT_HWORD(insn); |
| signed_value = SIGN_EXTEND_HWORD(signed_value); |
| signed_value <<= 2; |
| |
| /* See the note on the R_IREL reloc in coff_a29k_relocate_section. */ |
| if (signed_value == - (long) reloc_entry->address) |
| signed_value = 0; |
| |
| signed_value += sym_value + reloc_entry->addend; |
| if ((signed_value & ~0x3ffff) == 0) |
| { /* Absolute jmp/call */ |
| insn |= (1 << 24); /* Make it absolute */ |
| /* FIXME: Should we change r_type to R_IABS. */ |
| } |
| else |
| { |
| /* Relative jmp/call, so subtract from the value the |
| address of the place we're coming from. */ |
| signed_value -= (reloc_entry->address |
| + input_section->output_section->vma |
| + input_section->output_offset); |
| if (signed_value > 0x1ffff || signed_value < -0x20000) |
| return bfd_reloc_overflow; |
| } |
| signed_value >>= 2; |
| insn = INSERT_HWORD (insn, signed_value); |
| bfd_put_32 (abfd, (bfd_vma) insn ,hit_data); |
| break; |
| case R_ILOHALF: |
| insn = bfd_get_32 (abfd, hit_data); |
| unsigned_value = EXTRACT_HWORD(insn); |
| unsigned_value += sym_value + reloc_entry->addend; |
| insn = INSERT_HWORD(insn, unsigned_value); |
| bfd_put_32 (abfd, (bfd_vma) insn, hit_data); |
| break; |
| case R_IHIHALF: |
| insn = bfd_get_32 (abfd, hit_data); |
| /* consth, part 1 |
| Just get the symbol value that is referenced. */ |
| part1_consth_active = TRUE; |
| part1_consth_value = sym_value + reloc_entry->addend; |
| /* Don't modify insn until R_IHCONST. */ |
| break; |
| case R_IHCONST: |
| insn = bfd_get_32 (abfd, hit_data); |
| /* consth, part 2 |
| Now relocate the reference. */ |
| if (! part1_consth_active) |
| { |
| *error_message = (char *) _("Missing IHIHALF"); |
| return bfd_reloc_dangerous; |
| } |
| /* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */ |
| unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/ |
| unsigned_value += reloc_entry->addend; /* r_symndx */ |
| unsigned_value += part1_consth_value; |
| unsigned_value = unsigned_value >> 16; |
| insn = INSERT_HWORD(insn, unsigned_value); |
| part1_consth_active = FALSE; |
| bfd_put_32 (abfd, (bfd_vma) insn, hit_data); |
| break; |
| case R_BYTE: |
| insn = bfd_get_8 (abfd, hit_data); |
| unsigned_value = insn + sym_value + reloc_entry->addend; |
| if (unsigned_value & 0xffffff00) |
| return bfd_reloc_overflow; |
| bfd_put_8 (abfd, unsigned_value, hit_data); |
| break; |
| case R_HWORD: |
| insn = bfd_get_16 (abfd, hit_data); |
| unsigned_value = insn + sym_value + reloc_entry->addend; |
| if (unsigned_value & 0xffff0000) |
| return bfd_reloc_overflow; |
| bfd_put_16 (abfd, (bfd_vma) insn, hit_data); |
| break; |
| case R_WORD: |
| insn = bfd_get_32 (abfd, hit_data); |
| insn += sym_value + reloc_entry->addend; |
| bfd_put_32 (abfd, (bfd_vma) insn, hit_data); |
| break; |
| default: |
| *error_message = _("Unrecognized reloc"); |
| return bfd_reloc_dangerous; |
| } |
| |
| return(bfd_reloc_ok); |
| } |
| |
| /*FIXME: I'm not real sure about this table. */ |
| static reloc_howto_type howto_table[] = |
| { |
| {R_ABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield,a29k_reloc,"ABS", TRUE, 0xffffffff,0xffffffff, FALSE}, |
| EMPTY_HOWTO (1), |
| EMPTY_HOWTO (2), |
| EMPTY_HOWTO (3), |
| EMPTY_HOWTO (4), |
| EMPTY_HOWTO (5), |
| EMPTY_HOWTO (6), |
| EMPTY_HOWTO (7), |
| EMPTY_HOWTO (8), |
| EMPTY_HOWTO (9), |
| EMPTY_HOWTO (10), |
| EMPTY_HOWTO (11), |
| EMPTY_HOWTO (12), |
| EMPTY_HOWTO (13), |
| EMPTY_HOWTO (14), |
| EMPTY_HOWTO (15), |
| EMPTY_HOWTO (16), |
| EMPTY_HOWTO (17), |
| EMPTY_HOWTO (18), |
| EMPTY_HOWTO (19), |
| EMPTY_HOWTO (20), |
| EMPTY_HOWTO (21), |
| EMPTY_HOWTO (22), |
| EMPTY_HOWTO (23), |
| {R_IREL, 0, 3, 32, TRUE, 0, complain_overflow_signed,a29k_reloc,"IREL", TRUE, 0xffffffff,0xffffffff, FALSE}, |
| {R_IABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, a29k_reloc,"IABS", TRUE, 0xffffffff,0xffffffff, FALSE}, |
| {R_ILOHALF, 0, 3, 16, TRUE, 0, complain_overflow_signed, a29k_reloc,"ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE}, |
| {R_IHIHALF, 0, 3, 16, TRUE, 16, complain_overflow_signed, a29k_reloc,"IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE}, |
| {R_IHCONST, 0, 3, 16, TRUE, 0, complain_overflow_signed, a29k_reloc,"IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE}, |
| {R_BYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, a29k_reloc,"BYTE", TRUE, 0x000000ff,0x000000ff, FALSE}, |
| {R_HWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, a29k_reloc,"HWORD", TRUE, 0x0000ffff,0x0000ffff, FALSE}, |
| {R_WORD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, a29k_reloc,"WORD", TRUE, 0xffffffff,0xffffffff, FALSE}, |
| }; |
| |
| #define BADMAG(x) A29KBADMAG(x) |
| |
| #define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \ |
| reloc_processing(relent, reloc, symbols, abfd, section) |
| |
| static void |
| reloc_processing (relent,reloc, symbols, abfd, section) |
| arelent *relent; |
| struct internal_reloc *reloc; |
| asymbol **symbols; |
| bfd *abfd; |
| asection *section; |
| { |
| static bfd_vma ihihalf_vaddr = (bfd_vma) -1; |
| |
| relent->address = reloc->r_vaddr; |
| relent->howto = howto_table + reloc->r_type; |
| if (reloc->r_type == R_IHCONST) |
| { |
| /* The address of an R_IHCONST should always be the address of |
| the immediately preceding R_IHIHALF. relocs generated by gas |
| are correct, but relocs generated by High C are different (I |
| can't figure out what the address means for High C). We can |
| handle both gas and High C by ignoring the address here, and |
| simply reusing the address saved for R_IHIHALF. */ |
| if (ihihalf_vaddr == (bfd_vma) -1) |
| abort (); |
| relent->address = ihihalf_vaddr; |
| ihihalf_vaddr = (bfd_vma) -1; |
| relent->addend = reloc->r_symndx; |
| relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr; |
| } |
| else |
| { |
| asymbol *ptr; |
| |
| relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; |
| |
| ptr = *(relent->sym_ptr_ptr); |
| |
| if (ptr |
| && bfd_asymbol_bfd(ptr) == abfd |
| && ((ptr->flags & BSF_OLD_COMMON) == 0)) |
| relent->addend = 0; |
| else |
| relent->addend = 0; |
| |
| relent->address-= section->vma; |
| if (reloc->r_type == R_IHIHALF) |
| ihihalf_vaddr = relent->address; |
| else if (ihihalf_vaddr != (bfd_vma) -1) |
| abort (); |
| } |
| } |
| |
| /* The reloc processing routine for the optimized COFF linker. */ |
| |
| static bfd_boolean |
| coff_a29k_relocate_section (output_bfd, info, input_bfd, input_section, |
| contents, relocs, syms, sections) |
| bfd *output_bfd ATTRIBUTE_UNUSED; |
| struct bfd_link_info *info; |
| bfd *input_bfd; |
| asection *input_section; |
| bfd_byte *contents; |
| struct internal_reloc *relocs; |
| struct internal_syment *syms; |
| asection **sections; |
| { |
| struct internal_reloc *rel; |
| struct internal_reloc *relend; |
| bfd_boolean hihalf; |
| bfd_vma hihalf_val; |
| |
| /* If we are performing a relocateable link, we don't need to do a |
| thing. The caller will take care of adjusting the reloc |
| addresses and symbol indices. */ |
| if (info->relocateable) |
| return TRUE; |
| |
| hihalf = FALSE; |
| hihalf_val = 0; |
| |
| rel = relocs; |
| relend = rel + input_section->reloc_count; |
| for (; rel < relend; rel++) |
| { |
| long symndx; |
| bfd_byte *loc; |
| struct coff_link_hash_entry *h; |
| struct internal_syment *sym; |
| asection *sec; |
| bfd_vma val; |
| bfd_boolean overflow; |
| unsigned long insn; |
| long signed_value; |
| unsigned long unsigned_value; |
| bfd_reloc_status_type rstat; |
| |
| symndx = rel->r_symndx; |
| loc = contents + rel->r_vaddr - input_section->vma; |
| |
| if (symndx == -1 || rel->r_type == R_IHCONST) |
| h = NULL; |
| else |
| h = obj_coff_sym_hashes (input_bfd)[symndx]; |
| |
| sym = NULL; |
| sec = NULL; |
| val = 0; |
| |
| /* An R_IHCONST reloc does not have a symbol. Instead, the |
| symbol index is an addend. R_IHCONST is always used in |
| conjunction with R_IHHALF. */ |
| if (rel->r_type != R_IHCONST) |
| { |
| if (h == NULL) |
| { |
| if (symndx == -1) |
| sec = bfd_abs_section_ptr; |
| else |
| { |
| sym = syms + symndx; |
| sec = sections[symndx]; |
| val = (sec->output_section->vma |
| + sec->output_offset |
| + sym->n_value |
| - sec->vma); |
| } |
| } |
| else |
| { |
| if ( h->root.type == bfd_link_hash_defined |
| || h->root.type == bfd_link_hash_defweak) |
| { |
| sec = h->root.u.def.section; |
| val = (h->root.u.def.value |
| + sec->output_section->vma |
| + sec->output_offset); |
| } |
| else |
| { |
| if (! ((*info->callbacks->undefined_symbol) |
| (info, h->root.root.string, input_bfd, input_section, |
| rel->r_vaddr - input_section->vma, TRUE))) |
| return FALSE; |
| } |
| } |
| |
| if (hihalf) |
| { |
| if (! ((*info->callbacks->reloc_dangerous) |
| (info, _("missing IHCONST reloc"), input_bfd, |
| input_section, rel->r_vaddr - input_section->vma))) |
| return FALSE; |
| hihalf = FALSE; |
| } |
| } |
| |
| overflow = FALSE; |
| |
| switch (rel->r_type) |
| { |
| default: |
| bfd_set_error (bfd_error_bad_value); |
| return FALSE; |
| |
| case R_IREL: |
| insn = bfd_get_32 (input_bfd, loc); |
| |
| /* Extract the addend. */ |
| signed_value = EXTRACT_HWORD (insn); |
| signed_value = SIGN_EXTEND_HWORD (signed_value); |
| signed_value <<= 2; |
| |
| /* Unfortunately, there are two different versions of COFF |
| a29k. In the original AMD version, the value stored in |
| the field for the R_IREL reloc is a simple addend. In |
| the GNU version, the value is the negative of the address |
| of the reloc within section. We try to cope here by |
| assuming the AMD version, unless the addend is exactly |
| the negative of the address; in the latter case we assume |
| the GNU version. This means that something like |
| .text |
| nop |
| jmp i-4 |
| will fail, because the addend of -4 will happen to equal |
| the negative of the address within the section. The |
| compiler will never generate code like this. |
| |
| At some point in the future we may want to take out this |
| check. */ |
| |
| if (signed_value == - (long) (rel->r_vaddr - input_section->vma)) |
| signed_value = 0; |
| |
| /* Determine the destination of the jump. */ |
| signed_value += val; |
| |
| if ((signed_value & ~0x3ffff) == 0) |
| { |
| /* We can use an absolute jump. */ |
| insn |= (1 << 24); |
| } |
| else |
| { |
| /* Make the destination PC relative. */ |
| signed_value -= (input_section->output_section->vma |
| + input_section->output_offset |
| + (rel->r_vaddr - input_section->vma)); |
| if (signed_value > 0x1ffff || signed_value < - 0x20000) |
| { |
| overflow = TRUE; |
| signed_value = 0; |
| } |
| } |
| |
| /* Put the adjusted value back into the instruction. */ |
| signed_value >>= 2; |
| insn = INSERT_HWORD (insn, signed_value); |
| |
| bfd_put_32 (input_bfd, (bfd_vma) insn, loc); |
| break; |
| |
| case R_ILOHALF: |
| insn = bfd_get_32 (input_bfd, loc); |
| unsigned_value = EXTRACT_HWORD (insn); |
| unsigned_value += val; |
| insn = INSERT_HWORD (insn, unsigned_value); |
| bfd_put_32 (input_bfd, (bfd_vma) insn, loc); |
| break; |
| |
| case R_IHIHALF: |
| /* Save the value for the R_IHCONST reloc. */ |
| hihalf = TRUE; |
| hihalf_val = val; |
| break; |
| |
| case R_IHCONST: |
| if (! hihalf) |
| { |
| if (! ((*info->callbacks->reloc_dangerous) |
| (info, _("missing IHIHALF reloc"), input_bfd, |
| input_section, rel->r_vaddr - input_section->vma))) |
| return FALSE; |
| hihalf_val = 0; |
| } |
| |
| insn = bfd_get_32 (input_bfd, loc); |
| unsigned_value = rel->r_symndx + hihalf_val; |
| unsigned_value >>= 16; |
| insn = INSERT_HWORD (insn, unsigned_value); |
| bfd_put_32 (input_bfd, (bfd_vma) insn, loc); |
| |
| hihalf = FALSE; |
| |
| break; |
| |
| case R_BYTE: |
| case R_HWORD: |
| case R_WORD: |
| rstat = _bfd_relocate_contents (howto_table + rel->r_type, |
| input_bfd, val, loc); |
| if (rstat == bfd_reloc_overflow) |
| overflow = TRUE; |
| else if (rstat != bfd_reloc_ok) |
| abort (); |
| break; |
| } |
| |
| if (overflow) |
| { |
| const char *name; |
| char buf[SYMNMLEN + 1]; |
| |
| if (symndx == -1) |
| name = "*ABS*"; |
| else if (h != NULL) |
| name = h->root.root.string; |
| else if (sym == NULL) |
| name = "*unknown*"; |
| else if (sym->_n._n_n._n_zeroes == 0 |
| && sym->_n._n_n._n_offset != 0) |
| name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset; |
| else |
| { |
| strncpy (buf, sym->_n._n_name, SYMNMLEN); |
| buf[SYMNMLEN] = '\0'; |
| name = buf; |
| } |
| |
| if (! ((*info->callbacks->reloc_overflow) |
| (info, name, howto_table[rel->r_type].name, (bfd_vma) 0, |
| input_bfd, input_section, |
| rel->r_vaddr - input_section->vma))) |
| return FALSE; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| #define coff_relocate_section coff_a29k_relocate_section |
| |
| /* We don't want to change the symndx of a R_IHCONST reloc, since it |
| is actually an addend, not a symbol index at all. */ |
| |
| static bfd_boolean |
| coff_a29k_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp) |
| bfd *obfd ATTRIBUTE_UNUSED; |
| struct bfd_link_info *info ATTRIBUTE_UNUSED; |
| bfd *ibfd ATTRIBUTE_UNUSED; |
| asection *sec ATTRIBUTE_UNUSED; |
| struct internal_reloc *irel; |
| bfd_boolean *adjustedp; |
| { |
| if (irel->r_type == R_IHCONST) |
| *adjustedp = TRUE; |
| else |
| *adjustedp = FALSE; |
| return TRUE; |
| } |
| |
| #define coff_adjust_symndx coff_a29k_adjust_symndx |
| |
| #include "coffcode.h" |
| |
| CREATE_BIG_COFF_TARGET_VEC (a29kcoff_big_vec, "coff-a29k-big", 0, SEC_READONLY, '_', NULL) |