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Diffstat (limited to 'bfd/riscix.c')
| -rw-r--r-- | bfd/riscix.c | 643 |
1 files changed, 643 insertions, 0 deletions
diff --git a/bfd/riscix.c b/bfd/riscix.c new file mode 100644 index 0000000..8489859 --- /dev/null +++ b/bfd/riscix.c @@ -0,0 +1,643 @@ +/* BFD back-end for RISC iX (Acorn, arm) binaries. + Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) + +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. */ + + +/* RISC iX overloads the MAGIC field to indicate more than just the usual + [ZNO]MAGIC values. Also included are squeezing information and + shared library usage. */ + +/* The following come from the man page. */ +#define SHLIBLEN 60 + +#define MF_IMPURE 00200 +#define MF_SQUEEZED 01000 +#define MF_USES_SL 02000 +#define MF_IS_SL 04000 + +/* Common combinations. */ +#define IMAGIC (MF_IMPURE|ZMAGIC) /* Demand load (impure text) */ +#define SPOMAGIC (MF_USES_SL|OMAGIC) /* OMAGIC with large header */ + /* -- may contain a ref to a */ + /* shared lib required by the */ + /* object. */ +#define SLOMAGIC (MF_IS_SL|OMAGIC) /* A reference to a shared library */ + /* The text portion of the object */ + /* contains "overflow text" from */ + /* the shared library to be linked */ + /* in with an object */ +#define QMAGIC (MF_SQUEEZED|ZMAGIC) /* Sqeezed demand paged. */ + /* NOTE: This interpretation of */ + /* QMAGIC seems to be at variance */ + /* With that used on other */ + /* architectures. */ +#define SPZMAGIC (MF_USES_SL|ZMAGIC) /* program which uses sl */ +#define SPQMAGIC (MF_USES_SL|QMAGIC) /* sqeezed ditto */ +#define SLZMAGIC (MF_IS_SL|ZMAGIC) /* shared lib part of prog */ +#define SLPZMAGIC (MF_USES_SL|SLZMAGIC) /* sl which uses another */ + +#define N_SHARED_LIB(x) ((x).a_info & MF_USES_SL) + +/* Only a pure OMAGIC file has the minimal header */ +#define N_TXTOFF(x) \ + ((x).a_info == OMAGIC ? 32 \ + : (N_MAGIC(x) == ZMAGIC) ? TARGET_PAGE_SIZE \ + : 999) + +#define N_TXTADDR(x) \ + (N_MAGIC(x) != ZMAGIC ? 0 /* object file or NMAGIC */ \ + /* Programs with shared libs are loaded at the first page after all the \ + text segments of the shared library programs. Without looking this \ + up we can't know exactly what the address will be. A reasonable guess \ + is that a_entry will be in the first page of the executable. */ \ + : N_SHARED_LIB(x) ? ((x).a_entry & ~(TARGET_PAGE_SIZE - 1)) \ + : TEXT_START_ADDR) + +#define N_SYMOFF(x) \ + (N_TXTOFF (x) + (x).a_text + (x).a_data + (x).a_trsize + (x).a_drsize) + +#define N_STROFF(x) (N_SYMOFF (x) + (x).a_syms) + +#define TEXT_START_ADDR 32768 +#define TARGET_PAGE_SIZE 32768 +#define SEGMENT_SIZE TARGET_PAGE_SIZE +#define DEFAULT_ARCH bfd_arch_arm + +#define MY(OP) CAT(riscix_,OP) +#define TARGETNAME "a.out-riscix" +#define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \ + (((x).a_info & ~006000) != OMAGIC) && \ + ((x).a_info != NMAGIC)) +#define N_MAGIC(x) ((x).a_info & ~07200) + +#include "bfd.h" +#include "sysdep.h" +#include "libbfd.h" +#include "assert.h" + +#define WRITE_HEADERS(abfd, execp) \ + { \ + bfd_size_type text_size; /* dummy vars */ \ + file_ptr text_end; \ + if (adata(abfd).magic == undecided_magic) \ + NAME(aout,adjust_sizes_and_vmas) (abfd, &text_size, &text_end); \ + \ + execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \ + execp->a_entry = bfd_get_start_address (abfd); \ + \ + execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \ + obj_reloc_entry_size (abfd)); \ + execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \ + obj_reloc_entry_size (abfd)); \ + NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes); \ + \ + if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) return false; \ + if (bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd) \ + != EXEC_BYTES_SIZE) \ + return false; \ + /* Now write out reloc info, followed by syms and strings */ \ + \ + if (bfd_get_outsymbols (abfd) != (asymbol **) NULL \ + && bfd_get_symcount (abfd) != 0) \ + { \ + if (bfd_seek (abfd, (file_ptr)(N_SYMOFF(*execp)), SEEK_SET) != 0) \ + return false; \ + \ + if (! NAME(aout,write_syms)(abfd)) return false; \ + \ + if (bfd_seek (abfd, (file_ptr)(N_TRELOFF(*execp)), SEEK_SET) != 0) \ + return false; \ + \ + if (! riscix_squirt_out_relocs (abfd, obj_textsec (abfd))) \ + return false; \ + if (bfd_seek (abfd, (file_ptr)(N_DRELOFF(*execp)), SEEK_SET) != 0) \ + return false; \ + \ + if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd))) \ + return false; \ + } \ + } + +#include "libaout.h" +#include "aout/aout64.h" + +static bfd_reloc_status_type +riscix_fix_pcrel_26_done PARAMS ((bfd *, arelent *, asymbol *, PTR, + asection *, bfd *, char **)); + +static bfd_reloc_status_type +riscix_fix_pcrel_26 PARAMS ((bfd *, arelent *, asymbol *, PTR, + asection *, bfd *, char **)); + +static reloc_howto_type riscix_std_reloc_howto[] = { + /* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */ + HOWTO( 0, 0, 0, 8, false, 0, complain_overflow_bitfield,0,"8", true, 0x000000ff,0x000000ff, false), + HOWTO( 1, 0, 1, 16, false, 0, complain_overflow_bitfield,0,"16", true, 0x0000ffff,0x0000ffff, false), + HOWTO( 2, 0, 2, 32, false, 0, complain_overflow_bitfield,0,"32", true, 0xffffffff,0xffffffff, false), + HOWTO( 3, 2, 3, 26, true, 0, complain_overflow_signed, riscix_fix_pcrel_26 , "ARM26", true, 0x00ffffff,0x00ffffff, false), + HOWTO( 4, 0, 0, 8, true, 0, complain_overflow_signed, 0,"DISP8", true, 0x000000ff,0x000000ff, true), + HOWTO( 5, 0, 1, 16, true, 0, complain_overflow_signed, 0,"DISP16", true, 0x0000ffff,0x0000ffff, true), + HOWTO( 6, 0, 2, 32, true, 0, complain_overflow_signed, 0,"DISP32", true, 0xffffffff,0xffffffff, true), + HOWTO( 7, 2, 3, 26, false, 0, complain_overflow_signed, riscix_fix_pcrel_26_done, "ARM26D",true,0x00ffffff,0x00ffffff, false), + {-1}, + HOWTO( 9, 0, -1, 16, false, 0, complain_overflow_bitfield,0,"NEG16", true, 0x0000ffff,0x0000ffff, false), + HOWTO( 10, 0, -2, 32, false, 0, complain_overflow_bitfield,0,"NEG32", true, 0xffffffff,0xffffffff, false) +}; + +#define RISCIX_TABLE_SIZE \ + (sizeof (riscix_std_reloc_howto) / sizeof (reloc_howto_type)) + + +static bfd_reloc_status_type +riscix_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section, + output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + /* This is dead simple at present. */ + return bfd_reloc_ok; +} + +static bfd_reloc_status_type +riscix_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section, + output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + bfd_vma relocation; + bfd_size_type addr = reloc_entry->address; + long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); + bfd_reloc_status_type flag = bfd_reloc_ok; + + /* If this is an undefined symbol, return error */ + if (symbol->section == &bfd_und_section + && (symbol->flags & BSF_WEAK) == 0) + return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; + + /* If the sections are different, and we are doing a partial relocation, + just ignore it for now. */ + if (symbol->section->name != input_section->name + && output_bfd != (bfd *)NULL) + return bfd_reloc_continue; + + relocation = (target & 0x00ffffff) << 2; + relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */ + relocation += symbol->value; + relocation += symbol->section->output_section->vma; + relocation += symbol->section->output_offset; + relocation += reloc_entry->addend; + relocation -= input_section->output_section->vma; + relocation -= input_section->output_offset; + relocation -= addr; + if (relocation & 3) + return bfd_reloc_overflow; + + /* Check for overflow */ + if (relocation & 0x02000000) + { + if ((relocation & ~0x03ffffff) != ~0x03ffffff) + flag = bfd_reloc_overflow; + } + else if (relocation & ~0x03ffffff) + flag = bfd_reloc_overflow; + + target &= ~0x00ffffff; + target |= (relocation >> 2) & 0x00ffffff; + bfd_put_32 (abfd, target, (bfd_byte *) data + addr); + + /* Now the ARM magic... Change the reloc type so that it is marked as done. + Strictly this is only necessary if we are doing a partial relocation. */ + reloc_entry->howto = &riscix_std_reloc_howto[7]; + + return flag; +} + +reloc_howto_type * +DEFUN(riscix_reloc_type_lookup,(abfd,code), + bfd *abfd AND + bfd_reloc_code_real_type code) +{ +#define ASTD(i,j) case i: return &riscix_std_reloc_howto[j] + if (code == BFD_RELOC_CTOR) + switch (bfd_get_arch_info (abfd)->bits_per_address) + { + case 32: + code = BFD_RELOC_32; + break; + default: return (reloc_howto_type *) NULL; + } + + switch (code) + { + ASTD (BFD_RELOC_16, 1); + ASTD (BFD_RELOC_32, 2); + ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3); + ASTD (BFD_RELOC_8_PCREL, 4); + ASTD (BFD_RELOC_16_PCREL, 5); + ASTD (BFD_RELOC_32_PCREL, 6); + default: return (reloc_howto_type *) NULL; + } +} + +#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create +#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols +#define MY_bfd_final_link _bfd_generic_final_link + +#define MY_bfd_reloc_type_lookup riscix_reloc_type_lookup +#define MY_canonicalize_reloc riscix_canonicalize_reloc +#define MY_object_p riscix_object_p + +static const bfd_target *riscix_callback PARAMS ((bfd *)); + +void +riscix_swap_std_reloc_out (abfd, g, natptr) + bfd *abfd; + arelent *g; + struct reloc_std_external *natptr; +{ + int r_index; + asymbol *sym = *(g->sym_ptr_ptr); + int r_extern; + int r_length; + int r_pcrel; + int r_neg = 0; /* Negative relocs use the BASEREL bit. */ + asection *output_section = sym->section->output_section; + + PUT_WORD(abfd, g->address, natptr->r_address); + + r_length = g->howto->size ; /* Size as a power of two */ + if (r_length < 0) + { + r_length = -r_length; + r_neg = 1; + } + + r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */ + + /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the + relocation has been done already (Only for the 26-bit one I think)???!!! + */ + + if (r_length == 3) + r_pcrel = r_pcrel ? 0 : 1; + + +#if 0 + /* For a standard reloc, the addend is in the object file. */ + r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma; +#endif + + /* name was clobbered by aout_write_syms to be symbol index */ + + /* If this relocation is relative to a symbol then set the + r_index to the symbols index, and the r_extern bit. + + Absolute symbols can come in in two ways, either as an offset + from the abs section, or as a symbol which has an abs value. + check for that here + */ + + if (bfd_is_com_section (output_section) + || output_section == &bfd_abs_section + || output_section == &bfd_und_section) + { + if (bfd_abs_section.symbol == sym) + { + /* Whoops, looked like an abs symbol, but is really an offset + from the abs section */ + r_index = 0; + r_extern = 0; + } + else + { + /* Fill in symbol */ + r_extern = 1; + r_index = stoi((*(g->sym_ptr_ptr))->flags); + } + } + else + { + /* Just an ordinary section */ + r_extern = 0; + r_index = output_section->target_index; + } + + /* now the fun stuff */ + if (abfd->xvec->header_byteorder_big_p != false) + { + natptr->r_index[0] = r_index >> 16; + natptr->r_index[1] = r_index >> 8; + natptr->r_index[2] = r_index; + natptr->r_type[0] = + ( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0) + | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0) + | (r_neg ? RELOC_STD_BITS_BASEREL_BIG: 0) + | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG)); + } + else + { + natptr->r_index[2] = r_index >> 16; + natptr->r_index[1] = r_index >> 8; + natptr->r_index[0] = r_index; + natptr->r_type[0] = + ( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0) + | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0) + | (r_neg ? RELOC_STD_BITS_BASEREL_LITTLE: 0) + | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)); + } +} + +boolean +riscix_squirt_out_relocs (abfd, section) + bfd *abfd; + asection *section; +{ + arelent **generic; + unsigned char *native, *natptr; + size_t each_size; + + unsigned int count = section->reloc_count; + size_t natsize; + + if (count == 0) return true; + + each_size = obj_reloc_entry_size (abfd); + natsize = each_size * count; + native = (unsigned char *) bfd_zalloc (abfd, natsize); + if (!native) + return false; + + generic = section->orelocation; + + for (natptr = native; + count != 0; + --count, natptr += each_size, ++generic) + riscix_swap_std_reloc_out (abfd, *generic, + (struct reloc_std_external *) natptr); + + if ( bfd_write ((PTR) native, 1, natsize, abfd) != natsize) + { + bfd_release(abfd, native); + return false; + } + + bfd_release (abfd, native); + return true; +} + + +/* + * This is just like the standard aoutx.h version but we need to do our + * own mapping of external reloc type values to howto entries. + */ +long +MY(canonicalize_reloc)(abfd, section, relptr, symbols) + bfd *abfd; + sec_ptr section; + arelent **relptr; + asymbol **symbols; +{ + arelent *tblptr = section->relocation; + unsigned int count, c; + extern reloc_howto_type NAME(aout,std_howto_table)[]; + + /* If we have already read in the relocation table, return the values. */ + if (section->flags & SEC_CONSTRUCTOR) { + arelent_chain *chain = section->constructor_chain; + + for (count = 0; count < section->reloc_count; count++) { + *relptr++ = &chain->relent; + chain = chain->next; + } + *relptr = 0; + return section->reloc_count; + } + if (tblptr && section->reloc_count) { + for (count = 0; count++ < section->reloc_count;) + *relptr++ = tblptr++; + *relptr = 0; + return section->reloc_count; + } + + if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols)) + return -1; + tblptr = section->relocation; + + /* fix up howto entries */ + for (count = 0; count++ < section->reloc_count;) + { + c = tblptr->howto - NAME(aout,std_howto_table); + assert (c < RISCIX_TABLE_SIZE); + tblptr->howto = &riscix_std_reloc_howto[c]; + + *relptr++ = tblptr++; + } + *relptr = 0; + return section->reloc_count; +} + +/* This is the same as NAME(aout,some_aout_object_p), but has different + expansions of the macro definitions. */ + +const bfd_target * +riscix_some_aout_object_p (abfd, execp, callback_to_real_object_p) + bfd *abfd; + struct internal_exec *execp; + const bfd_target *(*callback_to_real_object_p) PARAMS ((bfd *)); +{ + struct aout_data_struct *rawptr, *oldrawptr; + const bfd_target *result; + + rawptr = ((struct aout_data_struct *) + bfd_zalloc (abfd, sizeof (struct aout_data_struct ))); + + if (rawptr == NULL) + return 0; + + oldrawptr = abfd->tdata.aout_data; + abfd->tdata.aout_data = rawptr; + + /* Copy the contents of the old tdata struct. + In particular, we want the subformat, since for hpux it was set in + hp300hpux.c:swap_exec_header_in and will be used in + hp300hpux.c:callback. */ + if (oldrawptr != NULL) + *abfd->tdata.aout_data = *oldrawptr; + + abfd->tdata.aout_data->a.hdr = &rawptr->e; + *(abfd->tdata.aout_data->a.hdr) = *execp; /* Copy in the internal_exec + struct */ + execp = abfd->tdata.aout_data->a.hdr; + + /* Set the file flags */ + abfd->flags = NO_FLAGS; + if (execp->a_drsize || execp->a_trsize) + abfd->flags |= HAS_RELOC; + /* Setting of EXEC_P has been deferred to the bottom of this function */ + if (execp->a_syms) + abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS; + if (N_DYNAMIC(*execp)) + abfd->flags |= DYNAMIC; + + + if ((execp->a_info & MF_SQUEEZED) != 0) /* Squeezed files aren't supported + (yet)! */ + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + else if ((execp->a_info & MF_IS_SL) != 0) /* Nor are shared libraries */ + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + else if (N_MAGIC (*execp) == ZMAGIC) + { + abfd->flags |= D_PAGED | WP_TEXT; + adata (abfd).magic = z_magic; + } + else if (N_MAGIC (*execp) == NMAGIC) + { + abfd->flags |= WP_TEXT; + adata (abfd).magic = n_magic; + } + else if (N_MAGIC (*execp) == OMAGIC) + adata (abfd).magic = o_magic; + else + { + /* Should have been checked with N_BADMAG before this routine + was called. */ + abort (); + } + + bfd_get_start_address (abfd) = execp->a_entry; + + obj_aout_symbols (abfd) = (aout_symbol_type *)NULL; + bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist); + + /* The default relocation entry size is that of traditional V7 Unix. */ + obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; + + /* The default symbol entry size is that of traditional Unix. */ + obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE; + + obj_aout_external_syms (abfd) = NULL; + obj_aout_external_strings (abfd) = NULL; + obj_aout_sym_hashes (abfd) = NULL; + + if (! NAME(aout,make_sections) (abfd)) + return NULL; + + obj_datasec (abfd)->_raw_size = execp->a_data; + obj_bsssec (abfd)->_raw_size = execp->a_bss; + + obj_textsec (abfd)->flags = + (execp->a_trsize != 0 + ? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC) + : (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)); + obj_datasec (abfd)->flags = + (execp->a_drsize != 0 + ? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC) + : (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS)); + obj_bsssec (abfd)->flags = SEC_ALLOC; + + result = (*callback_to_real_object_p)(abfd); + +#if defined(MACH) || defined(STAT_FOR_EXEC) + /* The original heuristic doesn't work in some important cases. The + * a.out file has no information about the text start address. For + * files (like kernels) linked to non-standard addresses (ld -Ttext + * nnn) the entry point may not be between the default text start + * (obj_textsec(abfd)->vma) and (obj_textsec(abfd)->vma) + text size + * This is not just a mach issue. Many kernels are loaded at non + * standard addresses. + */ + { + struct stat stat_buf; + if (abfd->iostream + && (fstat(fileno((FILE *) (abfd->iostream)), &stat_buf) == 0) + && ((stat_buf.st_mode & 0111) != 0)) + abfd->flags |= EXEC_P; + } +#else /* ! MACH */ + /* Now that the segment addresses have been worked out, take a better + guess at whether the file is executable. If the entry point + is within the text segment, assume it is. (This makes files + executable even if their entry point address is 0, as long as + their text starts at zero.) + + At some point we should probably break down and stat the file and + declare it executable if (one of) its 'x' bits are on... */ + if ((execp->a_entry >= obj_textsec(abfd)->vma) && + (execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->_raw_size)) + abfd->flags |= EXEC_P; +#endif /* MACH */ + if (result) + { + } + else + { + free (rawptr); + abfd->tdata.aout_data = oldrawptr; + } + return result; +} + + +static const bfd_target * +MY(object_p) (abfd) + bfd *abfd; +{ + struct external_exec exec_bytes; /* Raw exec header from file */ + struct internal_exec exec; /* Cleaned-up exec header */ + const bfd_target *target; + + if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd) + != EXEC_BYTES_SIZE) { + if (bfd_get_error () != bfd_error_system_call) + bfd_set_error (bfd_error_wrong_format); + return 0; + } + + exec.a_info = bfd_h_get_32 (abfd, exec_bytes.e_info); + + if (N_BADMAG (exec)) return 0; +#ifdef MACHTYPE_OK + if (!(MACHTYPE_OK (N_MACHTYPE (exec)))) return 0; +#endif + + NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec); + + target = riscix_some_aout_object_p (abfd, &exec, MY(callback)); + + return target; +} + + +#include "aout-target.h" |