1 /* tc-ppc.h -- Header file for tc-ppc.c. 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 3 2004, 2005 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor, Cygnus Support. 5 6 This file is part of GAS, the GNU Assembler. 7 8 GAS is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2, or (at your option) 11 any later version. 12 13 GAS is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GAS; see the file COPYING. If not, write to the Free 20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23 #define TC_PPC 24 25 #ifdef ANSI_PROTOTYPES 26 struct fix; 27 #endif 28 29 /* Set the endianness we are using. Default to big endian. */ 30 #ifndef TARGET_BYTES_BIG_ENDIAN 31 #define TARGET_BYTES_BIG_ENDIAN 1 32 #endif 33 34 #ifndef BFD_ASSEMBLER 35 #error PowerPC support requires BFD_ASSEMBLER 36 #endif 37 38 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling 39 XCOFF for AIX or PowerMac. If TE_PE is defined, we are assembling 40 COFF for Windows NT. */ 41 42 #ifdef OBJ_COFF 43 #ifndef TE_PE 44 #define OBJ_XCOFF 45 #endif 46 #endif 47 48 /* The target BFD architecture. */ 49 #define TARGET_ARCH (ppc_arch ()) 50 #define TARGET_MACH (ppc_mach ()) 51 extern enum bfd_architecture ppc_arch PARAMS ((void)); 52 extern unsigned long ppc_mach PARAMS ((void)); 53 54 /* Whether or not the target is big endian */ 55 extern int target_big_endian; 56 57 /* The target BFD format. */ 58 #define TARGET_FORMAT (ppc_target_format ()) 59 extern char *ppc_target_format PARAMS ((void)); 60 61 /* Permit temporary numeric labels. */ 62 #define LOCAL_LABELS_FB 1 63 64 /* $ is used to refer to the current location. */ 65 #define DOLLAR_DOT 66 67 /* Strings do not use backslash escapes under COFF. */ 68 #ifdef OBJ_COFF 69 #define NO_STRING_ESCAPES 70 #endif 71 72 #ifdef OBJ_ELF 73 #define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */ 74 #endif 75 76 #if TARGET_BYTES_BIG_ENDIAN 77 #define PPC_BIG_ENDIAN 1 78 #else 79 #define PPC_BIG_ENDIAN 0 80 #endif 81 82 /* We don't need to handle .word strangely. */ 83 #define WORKING_DOT_WORD 84 85 #define MAX_MEM_FOR_RS_ALIGN_CODE 4 86 #define HANDLE_ALIGN(FRAGP) \ 87 if ((FRAGP)->fr_type == rs_align_code) \ 88 { \ 89 valueT count = ((FRAGP)->fr_next->fr_address \ 90 - ((FRAGP)->fr_address + (FRAGP)->fr_fix)); \ 91 if (count != 0 && (count & 3) == 0) \ 92 { \ 93 char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix; \ 94 \ 95 (FRAGP)->fr_var = 4; \ 96 if (target_big_endian) \ 97 { \ 98 *dest++ = 0x60; \ 99 *dest++ = 0; \ 100 *dest++ = 0; \ 101 *dest++ = 0; \ 102 } \ 103 else \ 104 { \ 105 *dest++ = 0; \ 106 *dest++ = 0; \ 107 *dest++ = 0; \ 108 *dest++ = 0x60; \ 109 } \ 110 } \ 111 } 112 113 #define md_frag_check(FRAGP) \ 114 if ((FRAGP)->has_code \ 115 && (((FRAGP)->fr_address + (FRAGP)->insn_addr) & 3) != 0) \ 116 as_bad_where ((FRAGP)->fr_file, (FRAGP)->fr_line, \ 117 _("instruction address is not a multiple of 4")); 118 119 #ifdef TE_PE 120 121 /* Question marks are permitted in symbol names. */ 122 #define LEX_QM 1 123 124 /* Don't adjust TOC relocs. */ 125 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX) 126 extern int ppc_pe_fix_adjustable PARAMS ((struct fix *)); 127 128 #endif 129 130 #ifdef OBJ_XCOFF 131 132 /* Declarations needed when generating XCOFF code. XCOFF is an 133 extension of COFF, used only on the RS/6000. Rather than create an 134 obj-xcoff, we just use obj-coff, and handle the extensions here in 135 tc-ppc. */ 136 137 /* We need to keep some information for symbols. */ 138 struct ppc_tc_sy 139 { 140 /* We keep a few linked lists of symbols. */ 141 symbolS *next; 142 /* Non-zero if the symbol should be output. The RS/6000 assembler 143 only outputs symbols that are external or are mentioned in a 144 .globl or .lglobl statement. */ 145 int output; 146 /* The symbol class. */ 147 int class; 148 /* The real name, if the symbol was renamed. */ 149 char *real_name; 150 /* For a csect symbol, the subsegment we are using. This is zero 151 for symbols that are not csects. */ 152 subsegT subseg; 153 /* For a csect or common symbol, the alignment to use. */ 154 int align; 155 /* For a function symbol, a symbol whose value is the size. The 156 field is NULL if there is no size. */ 157 symbolS *size; 158 /* For a csect symbol, the last symbol which has been defined in 159 this csect, or NULL if none have been defined so far. For a .bs 160 symbol, the referenced csect symbol. */ 161 symbolS *within; 162 }; 163 164 #define TC_SYMFIELD_TYPE struct ppc_tc_sy 165 166 /* We need an additional auxent for function symbols. */ 167 #define OBJ_COFF_MAX_AUXENTRIES 2 168 169 /* Square and curly brackets are permitted in symbol names. */ 170 #define LEX_BR 3 171 172 /* Canonicalize the symbol name. */ 173 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name) 174 extern char *ppc_canonicalize_symbol_name PARAMS ((char *)); 175 176 /* Get the symbol class from the name. */ 177 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym) 178 extern void ppc_symbol_new_hook PARAMS ((symbolS *)); 179 180 /* Set the symbol class of a label based on the csect. */ 181 #define tc_frob_label(sym) ppc_frob_label (sym) 182 extern void ppc_frob_label PARAMS ((symbolS *)); 183 184 /* TOC relocs requires special handling. */ 185 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX) 186 extern int ppc_fix_adjustable PARAMS ((struct fix *)); 187 188 /* We need to set the section VMA. */ 189 #define tc_frob_section(sec) ppc_frob_section (sec) 190 extern void ppc_frob_section PARAMS ((asection *)); 191 192 /* Finish up the symbol. */ 193 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) 194 extern int ppc_frob_symbol PARAMS ((symbolS *)); 195 196 /* Finish up the entire symtab. */ 197 #define tc_adjust_symtab() ppc_adjust_symtab () 198 extern void ppc_adjust_symtab PARAMS ((void)); 199 200 /* We also need to copy, in particular, the class of the symbol, 201 over what obj-coff would otherwise have copied. */ 202 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src) \ 203 do { \ 204 if (SF_GET_GET_SEGMENT (dest)) \ 205 S_SET_SEGMENT (dest, S_GET_SEGMENT (src)); \ 206 symbol_get_tc (dest)->size = symbol_get_tc (src)->size; \ 207 symbol_get_tc (dest)->align = symbol_get_tc (src)->align; \ 208 symbol_get_tc (dest)->class = symbol_get_tc (src)->class; \ 209 symbol_get_tc (dest)->within = symbol_get_tc (src)->within; \ 210 } while (0) 211 212 #endif /* OBJ_XCOFF */ 213 214 extern const char ppc_symbol_chars[]; 215 #define tc_symbol_chars ppc_symbol_chars 216 217 #ifdef OBJ_ELF 218 219 /* Support for SHF_EXCLUDE and SHT_ORDERED */ 220 extern int ppc_section_letter PARAMS ((int, char **)); 221 extern int ppc_section_type PARAMS ((char *, size_t)); 222 extern int ppc_section_word PARAMS ((char *, size_t)); 223 extern int ppc_section_flags PARAMS ((int, int, int)); 224 225 #define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) 226 #define md_elf_section_type(STR, LEN) ppc_section_type (STR, LEN) 227 #define md_elf_section_word(STR, LEN) ppc_section_word (STR, LEN) 228 #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE) 229 230 #define tc_comment_chars ppc_comment_chars 231 extern const char *ppc_comment_chars; 232 233 /* Keep relocations relative to the GOT, or non-PC relative. */ 234 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX) 235 extern int ppc_fix_adjustable PARAMS ((struct fix *)); 236 237 /* Values passed to md_apply_fix don't include symbol values. */ 238 #define MD_APPLY_SYM_VALUE(FIX) 0 239 240 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust 241 extern void ppc_frob_file_before_adjust PARAMS ((void)); 242 243 #endif /* OBJ_ELF */ 244 245 #if defined (OBJ_ELF) || defined (OBJ_XCOFF) 246 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX) 247 extern int ppc_force_relocation PARAMS ((struct fix *)); 248 #endif 249 250 /* call md_pcrel_from_section, not md_pcrel_from */ 251 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC) 252 extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); 253 254 #define md_parse_name(name, exp, c) ppc_parse_name (name, exp) 255 extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); 256 257 #define md_operand(x) 258 259 #define md_cleanup() ppc_cleanup () 260 extern void ppc_cleanup PARAMS ((void)); 261 262 #define TARGET_USE_CFIPOP 1 263 264 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions 265 extern void ppc_cfi_frame_initial_instructions PARAMS ((void)); 266 267 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum 268 extern int tc_ppc_regname_to_dw2regnum PARAMS ((const char *regname)); 269 270 extern int ppc_cie_data_alignment; 271 272 #define DWARF2_LINE_MIN_INSN_LENGTH 4 273 #define DWARF2_DEFAULT_RETURN_COLUMN 0x41 274 #define DWARF2_CIE_DATA_ALIGNMENT ppc_cie_data_alignment 275