/* a.out object file format Copyright (C) 1989-2015 Free Software Foundation, Inc. This file is part of GAS, the GNU Assembler. GAS 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 3, or (at your option) any later version. GAS 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 GAS; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #define OBJ_HEADER "obj-aout.h" #include "as.h" #undef NO_RELOC #include "aout/aout64.h" void obj_aout_frob_symbol (symbolS *sym, int *punt ATTRIBUTE_UNUSED) { flagword flags; asection *sec; int type; flags = symbol_get_bfdsym (sym)->flags; type = aout_symbol (symbol_get_bfdsym (sym))->type; sec = S_GET_SEGMENT (sym); /* Only frob simple symbols this way right now. */ if (! (type & ~ (N_TYPE | N_EXT))) { if (type == (N_UNDF | N_EXT) && sec == bfd_abs_section_ptr) { sec = bfd_und_section_ptr; S_SET_SEGMENT (sym, sec); } if ((type & N_TYPE) != N_INDR && (type & N_TYPE) != N_SETA && (type & N_TYPE) != N_SETT && (type & N_TYPE) != N_SETD && (type & N_TYPE) != N_SETB && type != N_WARNING && (sec == bfd_abs_section_ptr || sec == bfd_und_section_ptr)) return; if (flags & BSF_EXPORT) type |= N_EXT; switch (type & N_TYPE) { case N_SETA: case N_SETT: case N_SETD: case N_SETB: /* Set the debugging flag for constructor symbols so that BFD leaves them alone. */ symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING; /* You can't put a common symbol in a set. The way a set element works is that the symbol has a definition and a name, and the linker adds the definition to the set of that name. That does not work for a common symbol, because the linker can't tell which common symbol the user means. FIXME: Using as_bad here may be inappropriate, since the user may want to force a particular type without regard to the semantics of sets; on the other hand, we certainly don't want anybody to be mislead into thinking that their code will work. */ if (S_IS_COMMON (sym)) as_bad (_("Attempt to put a common symbol into set %s"), S_GET_NAME (sym)); /* Similarly, you can't put an undefined symbol in a set. */ else if (! S_IS_DEFINED (sym)) as_bad (_("Attempt to put an undefined symbol into set %s"), S_GET_NAME (sym)); break; case N_INDR: /* Put indirect symbols in the indirect section. */ S_SET_SEGMENT (sym, bfd_ind_section_ptr); symbol_get_bfdsym (sym)->flags |= BSF_INDIRECT; if (type & N_EXT) { symbol_get_bfdsym (sym)->flags |= BSF_EXPORT; symbol_get_bfdsym (sym)->flags &=~ BSF_LOCAL; } break; case N_WARNING: /* Mark warning symbols. */ symbol_get_bfdsym (sym)->flags |= BSF_WARNING; break; } } else symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING; aout_symbol (symbol_get_bfdsym (sym))->type = type; /* Double check weak symbols. */ if (S_IS_WEAK (sym) && S_IS_COMMON (sym)) as_bad (_("Symbol `%s' can not be both weak and common"), S_GET_NAME (sym)); } void obj_aout_frob_file_before_fix (void) { /* Relocation processing may require knowing the VMAs of the sections. Since writing to a section will cause the BFD back end to compute the VMAs, fake it out here.... */ bfd_byte b = 0; bfd_boolean x = TRUE; if (bfd_section_size (stdoutput, text_section) != 0) x = bfd_set_section_contents (stdoutput, text_section, &b, (file_ptr) 0, (bfd_size_type) 1); else if (bfd_section_size (stdoutput, data_section) != 0) x = bfd_set_section_contents (stdoutput, data_section, &b, (file_ptr) 0, (bfd_size_type) 1); gas_assert (x); } static void obj_aout_line (int ignore ATTRIBUTE_UNUSED) { /* Assume delimiter is part of expression. BSD4.2 as fails with delightful bug, so we are not being incompatible here. */ new_logical_line ((char *) NULL, (int) (get_absolute_expression ())); demand_empty_rest_of_line (); } /* Handle .weak. This is a GNU extension. */ static void obj_aout_weak (int ignore ATTRIBUTE_UNUSED) { char *name; int c; symbolS *symbolP; do { name = input_line_pointer; c = get_symbol_end (); symbolP = symbol_find_or_make (name); *input_line_pointer = c; SKIP_WHITESPACE (); S_SET_WEAK (symbolP); if (c == ',') { input_line_pointer++; SKIP_WHITESPACE (); if (*input_line_pointer == '\n') c = '\n'; } } while (c == ','); demand_empty_rest_of_line (); } /* Handle .type. On {Net,Open}BSD, this is used to set the n_other field, which is then apparently used when doing dynamic linking. Older versions of gas ignored the .type pseudo-op, so we also ignore it if we can't parse it. */ static void obj_aout_type (int ignore ATTRIBUTE_UNUSED) { char *name; int c; symbolS *sym; name = input_line_pointer; c = get_symbol_end (); sym = symbol_find_or_make (name); *input_line_pointer = c; SKIP_WHITESPACE (); if (*input_line_pointer == ',') { ++input_line_pointer; SKIP_WHITESPACE (); if (*input_line_pointer == '@') { ++input_line_pointer; if (strncmp (input_line_pointer, "object", 6) == 0) S_SET_OTHER (sym, 1); else if (strncmp (input_line_pointer, "function", 8) == 0) S_SET_OTHER (sym, 2); } } /* Ignore everything else on the line. */ s_ignore (0); } /* Support for an AOUT emulation. */ static void aout_pop_insert (void) { pop_insert (aout_pseudo_table); } static int obj_aout_s_get_other (symbolS *sym) { return aout_symbol (symbol_get_bfdsym (sym))->other; } static void obj_aout_s_set_other (symbolS *sym, int o) { aout_symbol (symbol_get_bfdsym (sym))->other = o; } static int obj_aout_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED) { return obj_sec_sym_ok_for_reloc (sec); } static void obj_aout_process_stab (segT seg ATTRIBUTE_UNUSED, int w, const char *s, int t, int o, int d) { aout_process_stab (w, s, t, o, d); } static int obj_aout_s_get_desc (symbolS *sym) { return aout_symbol (symbol_get_bfdsym (sym))->desc; } static void obj_aout_s_set_desc (symbolS *sym, int d) { aout_symbol (symbol_get_bfdsym (sym))->desc = d; } static int obj_aout_s_get_type (symbolS *sym) { return aout_symbol (symbol_get_bfdsym (sym))->type; } static void obj_aout_s_set_type (symbolS *sym, int t) { aout_symbol (symbol_get_bfdsym (sym))->type = t; } static int obj_aout_separate_stab_sections (void) { return 0; } /* When changed, make sure these table entries match the single-format definitions in obj-aout.h. */ const struct format_ops aout_format_ops = { bfd_target_aout_flavour, 1, /* dfl_leading_underscore. */ 0, /* emit_section_symbols. */ 0, /* begin. */ 0, /* app_file. */ obj_aout_frob_symbol, 0, /* frob_file. */ 0, /* frob_file_before_adjust. */ obj_aout_frob_file_before_fix, 0, /* frob_file_after_relocs. */ 0, /* s_get_size. */ 0, /* s_set_size. */ 0, /* s_get_align. */ 0, /* s_set_align. */ obj_aout_s_get_other, obj_aout_s_set_other, obj_aout_s_get_desc, obj_aout_s_set_desc, obj_aout_s_get_type, obj_aout_s_set_type, 0, /* copy_symbol_attributes. */ 0, /* generate_asm_lineno. */ obj_aout_process_stab, obj_aout_separate_stab_sections, 0, /* init_stab_section. */ obj_aout_sec_sym_ok_for_reloc, aout_pop_insert, 0, /* ecoff_set_ext. */ 0, /* read_begin_hook. */ 0, /* symbol_new_hook. */ 0, /* symbol_clone_hook. */ 0 /* adjust_symtab. */ }; const pseudo_typeS aout_pseudo_table[] = { {"line", obj_aout_line, 0}, /* Source code line number. */ {"ln", obj_aout_line, 0}, /* COFF line number that we use anyway. */ {"weak", obj_aout_weak, 0}, /* Mark symbol as weak. */ {"type", obj_aout_type, 0}, /* coff debug pseudos (ignored) */ {"def", s_ignore, 0}, {"dim", s_ignore, 0}, {"endef", s_ignore, 0}, {"ident", s_ignore, 0}, {"line", s_ignore, 0}, {"ln", s_ignore, 0}, {"scl", s_ignore, 0}, {"size", s_ignore, 0}, {"tag", s_ignore, 0}, {"val", s_ignore, 0}, {"version", s_ignore, 0}, {"optim", s_ignore, 0}, /* For sun386i cc (?). */ /* other stuff */ {"ABORT", s_abort, 0}, {NULL, NULL, 0} };