1*a9fa9459Szrj /* subsegs.h -> subsegs.c 2*a9fa9459Szrj Copyright (C) 1987-2016 Free Software Foundation, Inc. 3*a9fa9459Szrj 4*a9fa9459Szrj This file is part of GAS, the GNU Assembler. 5*a9fa9459Szrj 6*a9fa9459Szrj GAS is free software; you can redistribute it and/or modify 7*a9fa9459Szrj it under the terms of the GNU General Public License as published by 8*a9fa9459Szrj the Free Software Foundation; either version 3, or (at your option) 9*a9fa9459Szrj any later version. 10*a9fa9459Szrj 11*a9fa9459Szrj GAS is distributed in the hope that it will be useful, 12*a9fa9459Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of 13*a9fa9459Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*a9fa9459Szrj GNU General Public License for more details. 15*a9fa9459Szrj 16*a9fa9459Szrj You should have received a copy of the GNU General Public License 17*a9fa9459Szrj along with GAS; see the file COPYING. If not, write to the Free 18*a9fa9459Szrj Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 19*a9fa9459Szrj 02110-1301, USA. */ 20*a9fa9459Szrj 21*a9fa9459Szrj /* 22*a9fa9459Szrj * For every sub-segment the user mentions in the ASsembler program, 23*a9fa9459Szrj * we make one struct frchain. Each sub-segment has exactly one struct frchain 24*a9fa9459Szrj * and vice versa. 25*a9fa9459Szrj * 26*a9fa9459Szrj * Struct frchain's are forward chained (in ascending order of sub-segment 27*a9fa9459Szrj * code number). The chain runs through frch_next of each subsegment. 28*a9fa9459Szrj * This makes it hard to find a subsegment's frags 29*a9fa9459Szrj * if programmer uses a lot of them. Most programs only use text0 and 30*a9fa9459Szrj * data0, so they don't suffer. At least this way: 31*a9fa9459Szrj * (1) There are no "arbitrary" restrictions on how many subsegments 32*a9fa9459Szrj * can be programmed; 33*a9fa9459Szrj * (2) Subsegments' frchain-s are (later) chained together in the order in 34*a9fa9459Szrj * which they are emitted for object file viz text then data. 35*a9fa9459Szrj * 36*a9fa9459Szrj * From each struct frchain dangles a chain of struct frags. The frags 37*a9fa9459Szrj * represent code fragments, for that sub-segment, forward chained. 38*a9fa9459Szrj */ 39*a9fa9459Szrj 40*a9fa9459Szrj #include "obstack.h" 41*a9fa9459Szrj 42*a9fa9459Szrj struct frch_cfi_data; 43*a9fa9459Szrj 44*a9fa9459Szrj struct frchain /* control building of a frag chain */ 45*a9fa9459Szrj { /* FRCH = FRagment CHain control */ 46*a9fa9459Szrj struct frag *frch_root; /* 1st struct frag in chain, or NULL */ 47*a9fa9459Szrj struct frag *frch_last; /* last struct frag in chain, or NULL */ 48*a9fa9459Szrj struct frchain *frch_next; /* next in chain of struct frchain-s */ 49*a9fa9459Szrj subsegT frch_subseg; /* subsegment number of this chain */ 50*a9fa9459Szrj fixS *fix_root; /* Root of fixups for this subsegment. */ 51*a9fa9459Szrj fixS *fix_tail; /* Last fixup for this subsegment. */ 52*a9fa9459Szrj struct obstack frch_obstack; /* for objects in this frag chain */ 53*a9fa9459Szrj fragS *frch_frag_now; /* frag_now for this subsegment */ 54*a9fa9459Szrj struct frch_cfi_data *frch_cfi_data; 55*a9fa9459Szrj }; 56*a9fa9459Szrj 57*a9fa9459Szrj typedef struct frchain frchainS; 58*a9fa9459Szrj 59*a9fa9459Szrj /* Frchain we are assembling into now. That is, the current segment's 60*a9fa9459Szrj frag chain, even if it contains no (complete) frags. */ 61*a9fa9459Szrj extern frchainS *frchain_now; 62*a9fa9459Szrj 63*a9fa9459Szrj typedef struct segment_info_struct { 64*a9fa9459Szrj frchainS *frchainP; 65*a9fa9459Szrj unsigned int hadone : 1; 66*a9fa9459Szrj 67*a9fa9459Szrj /* This field is set if this is a .bss section which does not really 68*a9fa9459Szrj have any contents. Once upon a time a .bss section did not have 69*a9fa9459Szrj any frags, but that is no longer true. This field prevent the 70*a9fa9459Szrj SEC_HAS_CONTENTS flag from being set for the section even if 71*a9fa9459Szrj there are frags. */ 72*a9fa9459Szrj unsigned int bss : 1; 73*a9fa9459Szrj 74*a9fa9459Szrj int user_stuff; 75*a9fa9459Szrj 76*a9fa9459Szrj /* Fixups for this segment. This is only valid after the frchains 77*a9fa9459Szrj are run together. */ 78*a9fa9459Szrj fixS *fix_root; 79*a9fa9459Szrj fixS *fix_tail; 80*a9fa9459Szrj 81*a9fa9459Szrj symbolS *dot; 82*a9fa9459Szrj 83*a9fa9459Szrj struct lineno_list *lineno_list_head; 84*a9fa9459Szrj struct lineno_list *lineno_list_tail; 85*a9fa9459Szrj 86*a9fa9459Szrj /* Which BFD section does this gas segment correspond to? */ 87*a9fa9459Szrj asection *bfd_section; 88*a9fa9459Szrj 89*a9fa9459Szrj /* NULL, or pointer to the gas symbol that is the section symbol for 90*a9fa9459Szrj this section. sym->bsym and bfd_section->symbol should be the same. */ 91*a9fa9459Szrj symbolS *sym; 92*a9fa9459Szrj 93*a9fa9459Szrj /* Used by dwarf2dbg.c for this section's line table entries. */ 94*a9fa9459Szrj void *dwarf2_line_seg; 95*a9fa9459Szrj 96*a9fa9459Szrj union { 97*a9fa9459Szrj /* Current size of section holding stabs strings. */ 98*a9fa9459Szrj unsigned long stab_string_size; 99*a9fa9459Szrj /* Initial frag for ELF. */ 100*a9fa9459Szrj char *p; 101*a9fa9459Szrj } 102*a9fa9459Szrj stabu; 103*a9fa9459Szrj 104*a9fa9459Szrj #ifdef NEED_LITERAL_POOL 105*a9fa9459Szrj unsigned long literal_pool_size; 106*a9fa9459Szrj #endif 107*a9fa9459Szrj 108*a9fa9459Szrj #ifdef TC_SEGMENT_INFO_TYPE 109*a9fa9459Szrj TC_SEGMENT_INFO_TYPE tc_segment_info_data; 110*a9fa9459Szrj #endif 111*a9fa9459Szrj } segment_info_type; 112*a9fa9459Szrj 113*a9fa9459Szrj 114*a9fa9459Szrj #define seg_info(sec) \ 115*a9fa9459Szrj ((segment_info_type *) bfd_get_section_userdata (stdoutput, sec)) 116*a9fa9459Szrj 117*a9fa9459Szrj extern symbolS *section_symbol (segT); 118*a9fa9459Szrj 119*a9fa9459Szrj extern void subsegs_print_statistics (FILE *); 120