| 1 | /* tc-xtensa.h -- Header file for tc-xtensa.c. |
| 2 | Copyright (C) 2003 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 19 | 02111-1307, USA. */ |
| 20 | |
| 21 | #ifndef TC_XTENSA |
| 22 | #define TC_XTENSA 1 |
| 23 | |
| 24 | #ifdef ANSI_PROTOTYPES |
| 25 | struct fix; |
| 26 | #endif |
| 27 | |
| 28 | #ifndef BFD_ASSEMBLER |
| 29 | #error Xtensa support requires BFD_ASSEMBLER |
| 30 | #endif |
| 31 | |
| 32 | #ifndef OBJ_ELF |
| 33 | #error Xtensa support requires ELF object format |
| 34 | #endif |
| 35 | |
| 36 | #include "xtensa-config.h" |
| 37 | |
| 38 | #define TARGET_BYTES_BIG_ENDIAN XCHAL_HAVE_BE |
| 39 | |
| 40 | |
| 41 | struct xtensa_frag_type |
| 42 | { |
| 43 | unsigned is_literal:1; |
| 44 | unsigned is_text:1; |
| 45 | unsigned is_loop_target:1; |
| 46 | unsigned is_branch_target:1; |
| 47 | unsigned is_insn:1; |
| 48 | |
| 49 | /* Info about the current state of assembly, i.e., density, relax, |
| 50 | generics, freeregs, longcalls. These need to be passed to the |
| 51 | backend and then to the linking file. */ |
| 52 | |
| 53 | unsigned is_no_density:1; |
| 54 | unsigned is_relax:1; |
| 55 | unsigned is_generics:1; |
| 56 | unsigned is_longcalls:1; |
| 57 | |
| 58 | /* For text fragments that can generate literals at relax time, this |
| 59 | variable points to the frag where the literal will be stored. For |
| 60 | literal frags, this variable points to the nearest literal pool |
| 61 | location frag. This literal frag will be moved to after this |
| 62 | location. */ |
| 63 | |
| 64 | fragS *literal_frag; |
| 65 | |
| 66 | /* The destination segment for literal frags. (Note that this is only |
| 67 | valid after xtensa_move_literals. */ |
| 68 | |
| 69 | segT lit_seg; |
| 70 | |
| 71 | /* For the relaxation scheme, some literal fragments can have their |
| 72 | expansions modified by an instruction that relaxes. */ |
| 73 | |
| 74 | unsigned text_expansion; |
| 75 | unsigned literal_expansion; |
| 76 | unsigned unreported_expansion; |
| 77 | }; |
| 78 | |
| 79 | typedef struct xtensa_block_info_struct |
| 80 | { |
| 81 | segT sec; |
| 82 | bfd_vma offset; |
| 83 | size_t size; |
| 84 | struct xtensa_block_info_struct *next; |
| 85 | } xtensa_block_info; |
| 86 | |
| 87 | typedef enum |
| 88 | { |
| 89 | xt_insn_sec, |
| 90 | xt_literal_sec, |
| 91 | max_xt_sec |
| 92 | } xt_section_type; |
| 93 | |
| 94 | typedef struct xtensa_segment_info_struct |
| 95 | { |
| 96 | fragS *literal_pool_loc; |
| 97 | xtensa_block_info *blocks[max_xt_sec]; |
| 98 | } xtensa_segment_info; |
| 99 | |
| 100 | typedef struct xtensa_symfield_type_struct |
| 101 | { |
| 102 | unsigned int plt : 1; |
| 103 | unsigned int is_loop_target : 1; |
| 104 | unsigned int is_branch_target : 1; |
| 105 | } xtensa_symfield_type; |
| 106 | |
| 107 | |
| 108 | /* Section renaming is only supported in Tensilica's version of GAS. */ |
| 109 | #define XTENSA_SECTION_RENAME 1 |
| 110 | #ifdef XTENSA_SECTION_RENAME |
| 111 | extern const char *xtensa_section_rename |
| 112 | PARAMS ((const char *)); |
| 113 | #else |
| 114 | /* Tensilica's section renaming feature is not included here. */ |
| 115 | #define xtensa_section_rename(name) (name) |
| 116 | #endif /* XTENSA_SECTION_RENAME */ |
| 117 | |
| 118 | |
| 119 | extern const char *xtensa_target_format |
| 120 | PARAMS ((void)); |
| 121 | extern void xtensa_frag_init |
| 122 | PARAMS ((fragS *)); |
| 123 | extern void xtensa_cons_fix_new |
| 124 | PARAMS ((fragS *, int, int, expressionS *)); |
| 125 | extern void xtensa_frob_label |
| 126 | PARAMS ((struct symbol *)); |
| 127 | extern void xtensa_end |
| 128 | PARAMS ((void)); |
| 129 | extern void xtensa_post_relax_hook |
| 130 | PARAMS ((void)); |
| 131 | extern void xtensa_file_arch_init |
| 132 | PARAMS ((bfd *)); |
| 133 | extern void xtensa_flush_pending_output |
| 134 | PARAMS ((void)); |
| 135 | extern bfd_boolean xtensa_fix_adjustable |
| 136 | PARAMS ((struct fix *)); |
| 137 | extern void xtensa_symbol_new_hook |
| 138 | PARAMS ((symbolS *)); |
| 139 | extern long xtensa_relax_frag |
| 140 | PARAMS ((fragS *, long, int *)); |
| 141 | |
| 142 | #define TARGET_FORMAT xtensa_target_format () |
| 143 | #define TARGET_ARCH bfd_arch_xtensa |
| 144 | #define TC_SEGMENT_INFO_TYPE xtensa_segment_info |
| 145 | #define TC_SYMFIELD_TYPE xtensa_symfield_type |
| 146 | #define TC_FRAG_TYPE struct xtensa_frag_type |
| 147 | #define TC_FRAG_INIT(frag) xtensa_frag_init (frag) |
| 148 | #define TC_CONS_FIX_NEW xtensa_cons_fix_new |
| 149 | #define tc_canonicalize_symbol_name(s) xtensa_section_rename (s) |
| 150 | #define tc_init_after_args() xtensa_file_arch_init (stdoutput) |
| 151 | #define tc_fix_adjustable(fix) xtensa_fix_adjustable (fix) |
| 152 | #define tc_frob_label(sym) xtensa_frob_label (sym) |
| 153 | #define tc_symbol_new_hook(s) xtensa_symbol_new_hook (s) |
| 154 | #define md_elf_section_rename(name) xtensa_section_rename (name) |
| 155 | #define md_end xtensa_end |
| 156 | #define md_flush_pending_output() xtensa_flush_pending_output () |
| 157 | #define md_operand(x) |
| 158 | #define TEXT_SECTION_NAME xtensa_section_rename (".text") |
| 159 | #define DATA_SECTION_NAME xtensa_section_rename (".data") |
| 160 | #define BSS_SECTION_NAME xtensa_section_rename (".bss") |
| 161 | |
| 162 | |
| 163 | /* The renumber_section function must be mapped over all the sections |
| 164 | after calling xtensa_post_relax_hook. That function is static in |
| 165 | write.c so it cannot be called from xtensa_post_relax_hook itself. */ |
| 166 | |
| 167 | #define md_post_relax_hook \ |
| 168 | do \ |
| 169 | { \ |
| 170 | int i = 0; \ |
| 171 | xtensa_post_relax_hook (); \ |
| 172 | bfd_map_over_sections (stdoutput, renumber_sections, &i); \ |
| 173 | } \ |
| 174 | while (0) |
| 175 | |
| 176 | |
| 177 | /* Because xtensa relaxation can insert a new literal into the middle of |
| 178 | fragment and thus require re-running the relaxation pass on the |
| 179 | section, we need an explicit flag here. We explicitly use the name |
| 180 | "stretched" here to avoid changing the source code in write.c. */ |
| 181 | |
| 182 | #define md_relax_frag(segment, fragP, stretch) \ |
| 183 | xtensa_relax_frag (fragP, stretch, &stretched) |
| 184 | |
| 185 | |
| 186 | #define LOCAL_LABELS_FB 1 |
| 187 | #define WORKING_DOT_WORD 1 |
| 188 | #define DOUBLESLASH_LINE_COMMENTS |
| 189 | #define TC_HANDLES_FX_DONE |
| 190 | #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 0 |
| 191 | |
| 192 | #define MD_APPLY_SYM_VALUE(FIX) 0 |
| 193 | |
| 194 | #endif /* TC_XTENSA */ |