550 lines
14 KiB
C
550 lines
14 KiB
C
/* a.out object file format
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Copyright (C) 1989, 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with GAS; see the file COPYING. If not, write
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to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "as.h"
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#ifdef BFD_ASSEMBLER
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#undef NO_RELOC
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#include "aout/aout64.h"
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#endif
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#include "obstack.h"
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#ifndef BFD_ASSEMBLER
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/* in: segT out: N_TYPE bits */
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const short seg_N_TYPE[] =
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{
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N_ABS,
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N_TEXT,
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N_DATA,
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N_BSS,
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N_UNDF, /* unknown */
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N_UNDF, /* error */
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N_UNDF, /* expression */
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N_UNDF, /* debug */
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N_UNDF, /* ntv */
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N_UNDF, /* ptv */
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N_REGISTER, /* register */
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};
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const segT N_TYPE_seg[N_TYPE + 2] =
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{ /* N_TYPE == 0x1E = 32-2 */
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SEG_UNKNOWN, /* N_UNDF == 0 */
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SEG_GOOF,
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SEG_ABSOLUTE, /* N_ABS == 2 */
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SEG_GOOF,
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SEG_TEXT, /* N_TEXT == 4 */
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SEG_GOOF,
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SEG_DATA, /* N_DATA == 6 */
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SEG_GOOF,
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SEG_BSS, /* N_BSS == 8 */
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SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
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SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */
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SEG_GOOF,
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};
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#endif
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static void obj_aout_line PARAMS ((int));
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static void obj_aout_weak PARAMS ((int));
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const pseudo_typeS obj_pseudo_table[] =
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{
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{"line", obj_aout_line, 0}, /* source code line number */
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{"ln", obj_aout_line, 0}, /* coff line number that we use anyway */
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{"weak", obj_aout_weak, 0}, /* mark symbol as weak. */
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/* coff debug pseudos (ignored) */
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{"def", s_ignore, 0},
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{"dim", s_ignore, 0},
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{"endef", s_ignore, 0},
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{"ident", s_ignore, 0},
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{"line", s_ignore, 0},
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{"ln", s_ignore, 0},
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{"scl", s_ignore, 0},
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{"size", s_ignore, 0},
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{"tag", s_ignore, 0},
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{"type", s_ignore, 0},
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{"val", s_ignore, 0},
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{"version", s_ignore, 0},
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{"optim", s_ignore, 0}, /* For sun386i cc (?) */
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/* other stuff */
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{"ABORT", s_abort, 0},
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{NULL} /* end sentinel */
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}; /* obj_pseudo_table */
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#ifdef BFD_ASSEMBLER
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void
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obj_aout_frob_symbol (sym, punt)
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symbolS *sym;
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int *punt;
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{
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flagword flags;
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asection *sec;
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int desc, type, other;
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flags = sym->bsym->flags;
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desc = S_GET_DESC (sym);
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type = S_GET_TYPE (sym);
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other = S_GET_OTHER (sym);
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sec = sym->bsym->section;
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/* Only frob simple symbols this way right now. */
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if (! (type & ~ (N_TYPE | N_EXT)))
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{
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if (type == (N_UNDF | N_EXT)
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&& sec == &bfd_abs_section)
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sym->bsym->section = sec = bfd_und_section_ptr;
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if ((type & N_TYPE) != N_INDR
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&& (type & N_TYPE) != N_SETA
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&& (type & N_TYPE) != N_SETT
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&& (type & N_TYPE) != N_SETD
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&& (type & N_TYPE) != N_SETB
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&& type != N_WARNING
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&& (sec == &bfd_abs_section
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|| sec == &bfd_und_section))
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return;
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if (flags & BSF_EXPORT)
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type |= N_EXT;
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switch (type & N_TYPE)
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{
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case N_SETA:
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case N_SETT:
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case N_SETD:
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case N_SETB:
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/* Set the debugging flag for constructor symbols so that
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BFD leaves them alone. */
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sym->bsym->flags |= BSF_DEBUGGING;
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/* You can't put a common symbol in a set. The way a set
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element works is that the symbol has a definition and a
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name, and the linker adds the definition to the set of
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that name. That does not work for a common symbol,
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because the linker can't tell which common symbol the
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user means. FIXME: Using as_bad here may be
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inappropriate, since the user may want to force a
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particular type without regard to the semantics of sets;
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on the other hand, we certainly don't want anybody to be
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mislead into thinking that their code will work. */
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if (S_IS_COMMON (sym))
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as_bad ("Attempt to put a common symbol into set %s",
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S_GET_NAME (sym));
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/* Similarly, you can't put an undefined symbol in a set. */
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else if (! S_IS_DEFINED (sym))
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as_bad ("Attempt to put an undefined symbol into set %s",
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S_GET_NAME (sym));
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break;
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case N_INDR:
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/* Put indirect symbols in the indirect section. */
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sym->bsym->section = bfd_ind_section_ptr;
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sym->bsym->flags |= BSF_INDIRECT;
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if (type & N_EXT)
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{
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sym->bsym->flags |= BSF_EXPORT;
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sym->bsym->flags &=~ BSF_LOCAL;
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}
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break;
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case N_WARNING:
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/* Mark warning symbols. */
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sym->bsym->flags |= BSF_WARNING;
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break;
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}
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}
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else
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{
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sym->bsym->flags |= BSF_DEBUGGING;
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}
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S_SET_TYPE (sym, type);
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/* Double check weak symbols. */
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if (sym->bsym->flags & BSF_WEAK)
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{
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if (S_IS_COMMON (sym))
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as_bad ("Symbol `%s' can not be both weak and common",
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S_GET_NAME (sym));
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}
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}
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void
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obj_aout_frob_file ()
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{
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/* Relocation processing may require knowing the VMAs of the sections.
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Since writing to a section will cause the BFD back end to compute the
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VMAs, fake it out here.... */
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bfd_byte b = 0;
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boolean x = true;
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if (bfd_section_size (stdoutput, text_section) != 0)
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{
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x = bfd_set_section_contents (stdoutput, text_section, &b, (file_ptr) 0,
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(bfd_size_type) 1);
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}
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else if (bfd_section_size (stdoutput, data_section) != 0)
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{
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x = bfd_set_section_contents (stdoutput, data_section, &b, (file_ptr) 0,
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(bfd_size_type) 1);
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}
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assert (x == true);
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}
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#else
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/* Relocation. */
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/*
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* emit_relocations()
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*
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* Crawl along a fixS chain. Emit the segment's relocations.
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*/
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void
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obj_emit_relocations (where, fixP, segment_address_in_file)
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char **where;
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fixS *fixP; /* Fixup chain for this segment. */
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relax_addressT segment_address_in_file;
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{
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for (; fixP; fixP = fixP->fx_next)
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if (fixP->fx_done == 0)
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{
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tc_aout_fix_to_chars (*where, fixP, segment_address_in_file);
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*where += md_reloc_size;
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}
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}
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#ifndef obj_header_append
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/* Aout file generation & utilities */
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void
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obj_header_append (where, headers)
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char **where;
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object_headers *headers;
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{
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tc_headers_hook (headers);
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#ifdef CROSS_COMPILE
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md_number_to_chars (*where, headers->header.a_info, sizeof (headers->header.a_info));
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*where += sizeof (headers->header.a_info);
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md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
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*where += sizeof (headers->header.a_text);
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md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
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*where += sizeof (headers->header.a_data);
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md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
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*where += sizeof (headers->header.a_bss);
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md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
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*where += sizeof (headers->header.a_syms);
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md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
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*where += sizeof (headers->header.a_entry);
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md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
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*where += sizeof (headers->header.a_trsize);
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md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
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*where += sizeof (headers->header.a_drsize);
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#else /* CROSS_COMPILE */
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append (where, (char *) &headers->header, sizeof (headers->header));
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#endif /* CROSS_COMPILE */
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}
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#endif
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void
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obj_symbol_to_chars (where, symbolP)
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char **where;
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symbolS *symbolP;
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{
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md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
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md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
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md_number_to_chars ((char *) &(symbolP->sy_symbol.n_value), S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
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append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
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}
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void
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obj_emit_symbols (where, symbol_rootP)
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char **where;
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symbolS *symbol_rootP;
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{
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symbolS *symbolP;
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/* Emit all symbols left in the symbol chain. */
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for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
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{
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/* Used to save the offset of the name. It is used to point
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to the string in memory but must be a file offset. */
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register char *temp;
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temp = S_GET_NAME (symbolP);
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S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
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/* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
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if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
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S_SET_EXTERNAL (symbolP);
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/* Adjust the type of a weak symbol. */
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if (S_GET_WEAK (symbolP))
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{
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switch (S_GET_TYPE (symbolP))
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{
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case N_UNDF: S_SET_TYPE (symbolP, N_WEAKU); break;
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case N_ABS: S_SET_TYPE (symbolP, N_WEAKA); break;
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case N_TEXT: S_SET_TYPE (symbolP, N_WEAKT); break;
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case N_DATA: S_SET_TYPE (symbolP, N_WEAKD); break;
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case N_BSS: S_SET_TYPE (symbolP, N_WEAKB); break;
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default: as_bad ("%s: bad type for weak symbol", temp); break;
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}
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}
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obj_symbol_to_chars (where, symbolP);
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S_SET_NAME (symbolP, temp);
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}
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}
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#endif /* ! BFD_ASSEMBLER */
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static void
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obj_aout_line (ignore)
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int ignore;
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{
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/* Assume delimiter is part of expression.
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BSD4.2 as fails with delightful bug, so we
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are not being incompatible here. */
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new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
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demand_empty_rest_of_line ();
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} /* obj_aout_line() */
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/* Handle .weak. This is a GNU extension. */
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static void
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obj_aout_weak (ignore)
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int ignore;
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{
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char *name;
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int c;
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symbolS *symbolP;
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do
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{
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name = input_line_pointer;
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c = get_symbol_end ();
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symbolP = symbol_find_or_make (name);
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*input_line_pointer = c;
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SKIP_WHITESPACE ();
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S_SET_WEAK (symbolP);
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if (c == ',')
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{
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input_line_pointer++;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == '\n')
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c = '\n';
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}
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}
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while (c == ',');
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demand_empty_rest_of_line ();
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}
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void
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obj_read_begin_hook ()
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{
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}
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#ifndef BFD_ASSEMBLER
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void
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obj_crawl_symbol_chain (headers)
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object_headers *headers;
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{
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symbolS *symbolP;
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symbolS **symbolPP;
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int symbol_number = 0;
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tc_crawl_symbol_chain (headers);
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symbolPP = &symbol_rootP; /*->last symbol chain link. */
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while ((symbolP = *symbolPP) != NULL)
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{
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if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA))
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{
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S_SET_SEGMENT (symbolP, SEG_TEXT);
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} /* if pusing data into text */
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resolve_symbol_value (symbolP);
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/* OK, here is how we decide which symbols go out into the brave
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new symtab. Symbols that do are:
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* symbols with no name (stabd's?)
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* symbols with debug info in their N_TYPE
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Symbols that don't are:
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* symbols that are registers
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* symbols with \1 as their 3rd character (numeric labels)
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* "local labels" as defined by S_LOCAL_NAME(name) if the -L
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switch was passed to gas.
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All other symbols are output. We complain if a deleted
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symbol was marked external. */
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if (!S_IS_REGISTER (symbolP)
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&& (!S_GET_NAME (symbolP)
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|| S_IS_DEBUG (symbolP)
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|| !S_IS_DEFINED (symbolP)
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|| S_IS_EXTERNAL (symbolP)
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|| (S_GET_NAME (symbolP)[0] != '\001'
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&& (flag_keep_locals || !S_LOCAL_NAME (symbolP)))))
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{
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symbolP->sy_number = symbol_number++;
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/* The + 1 after strlen account for the \0 at the
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end of each string */
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if (!S_IS_STABD (symbolP))
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{
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/* Ordinary case. */
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symbolP->sy_name_offset = string_byte_count;
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string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
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}
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else /* .Stabd case. */
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symbolP->sy_name_offset = 0;
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symbolPP = &(symbol_next (symbolP));
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}
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else
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{
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if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
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/* This warning should never get triggered any more.
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Well, maybe if you're doing twisted things with
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register names... */
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{
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as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP)));
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} /* oops. */
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/* Unhook it from the chain */
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*symbolPP = symbol_next (symbolP);
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} /* if this symbol should be in the output */
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} /* for each symbol */
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H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
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}
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/*
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* Find strings by crawling along symbol table chain.
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*/
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void
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obj_emit_strings (where)
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char **where;
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{
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symbolS *symbolP;
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#ifdef CROSS_COMPILE
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/* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
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md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
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*where += sizeof (string_byte_count);
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#else /* CROSS_COMPILE */
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append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
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#endif /* CROSS_COMPILE */
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for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
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{
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if (S_GET_NAME (symbolP))
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append (&next_object_file_charP, S_GET_NAME (symbolP),
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(unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
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} /* walk symbol chain */
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}
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#ifndef AOUT_VERSION
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#define AOUT_VERSION 0
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#endif
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void
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obj_pre_write_hook (headers)
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object_headers *headers;
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{
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H_SET_DYNAMIC (headers, 0);
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H_SET_VERSION (headers, AOUT_VERSION);
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H_SET_MACHTYPE (headers, AOUT_MACHTYPE);
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tc_aout_pre_write_hook (headers);
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}
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void
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DEFUN_VOID (s_sect)
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{
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/* Strip out the section name */
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char *section_name;
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char *section_name_end;
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char c;
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unsigned int len;
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unsigned int exp;
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char *save;
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section_name = input_line_pointer;
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c = get_symbol_end ();
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section_name_end = input_line_pointer;
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len = section_name_end - section_name;
|
|
input_line_pointer++;
|
|
save = input_line_pointer;
|
|
|
|
SKIP_WHITESPACE ();
|
|
if (c == ',')
|
|
{
|
|
exp = get_absolute_expression ();
|
|
}
|
|
else if (*input_line_pointer == ',')
|
|
{
|
|
input_line_pointer++;
|
|
exp = get_absolute_expression ();
|
|
}
|
|
else
|
|
{
|
|
input_line_pointer = save;
|
|
exp = 0;
|
|
}
|
|
if (exp >= 1000)
|
|
{
|
|
as_bad ("subsegment index too high");
|
|
}
|
|
|
|
if (strcmp (section_name, ".text") == 0)
|
|
{
|
|
subseg_set (SEG_TEXT, (subsegT) exp);
|
|
}
|
|
|
|
if (strcmp (section_name, ".data") == 0)
|
|
{
|
|
if (flag_readonly_data_in_text)
|
|
subseg_set (SEG_TEXT, (subsegT) exp + 1000);
|
|
else
|
|
subseg_set (SEG_DATA, (subsegT) exp);
|
|
}
|
|
|
|
*section_name_end = c;
|
|
}
|
|
|
|
#endif /* ! BFD_ASSEMBLER */
|
|
|
|
/* end of obj-aout.c */
|