tc-ppc.h revision 60484
1/* tc-ppc.h -- Header file for tc-ppc.c. 2 Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000 3 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, 59 Temple Place - Suite 330, Boston, MA 21 02111-1307, USA. */ 22 23#define TC_PPC 24 25#ifdef ANSI_PROTOTYPES 26struct 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 ()) 50extern enum bfd_architecture ppc_arch PARAMS ((void)); 51 52/* Whether or not the target is big endian */ 53extern int target_big_endian; 54 55/* The target BFD format. */ 56#ifdef OBJ_COFF 57#ifdef TE_PE 58#define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle") 59#else 60#define TARGET_FORMAT "aixcoff-rs6000" 61#endif 62#endif 63 64/* PowerMac has a BFD slightly different from AIX's. */ 65#ifdef TE_POWERMAC 66#ifdef TARGET_FORMAT 67#undef TARGET_FORMAT 68#endif 69#define TARGET_FORMAT "xcoff-powermac" 70#endif 71 72#ifdef OBJ_ELF 73#define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle") 74#endif 75 76/* Permit temporary numeric labels. */ 77#define LOCAL_LABELS_FB 1 78 79/* $ is used to refer to the current location. */ 80#define DOLLAR_DOT 81 82/* Strings do not use backslash escapes under COFF. */ 83#ifdef OBJ_COFF 84#define NO_STRING_ESCAPES 85#endif 86 87#ifdef OBJ_ELF 88#define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */ 89#endif 90 91#if TARGET_BYTES_BIG_ENDIAN 92#define PPC_BIG_ENDIAN 1 93#else 94#define PPC_BIG_ENDIAN 0 95#endif 96 97/* We don't need to handle .word strangely. */ 98#define WORKING_DOT_WORD 99 100/* We set the fx_done field appropriately in md_apply_fix. */ 101#define TC_HANDLES_FX_DONE 102 103#ifdef TE_PE 104 105/* Question marks are permitted in symbol names. */ 106#define LEX_QM 1 107 108/* Don't adjust TOC relocs. */ 109#define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp) 110extern int ppc_pe_fix_adjustable PARAMS ((struct fix *)); 111 112#endif 113 114#ifdef OBJ_XCOFF 115 116/* Declarations needed when generating XCOFF code. XCOFF is an 117 extension of COFF, used only on the RS/6000. Rather than create an 118 obj-xcoff, we just use obj-coff, and handle the extensions here in 119 tc-ppc. */ 120 121/* We need to keep some information for symbols. */ 122struct ppc_tc_sy 123{ 124 /* We keep a few linked lists of symbols. */ 125 symbolS *next; 126 /* Non-zero if the symbol should be output. The RS/6000 assembler 127 only outputs symbols that are external or are mentioned in a 128 .globl or .lglobl statement. */ 129 int output; 130 /* The symbol class. */ 131 int class; 132 /* The real name, if the symbol was renamed. */ 133 char *real_name; 134 /* For a csect symbol, the subsegment we are using. This is zero 135 for symbols that are not csects. */ 136 subsegT subseg; 137 /* For a csect or common symbol, the alignment to use. */ 138 int align; 139 /* For a function symbol, a symbol whose value is the size. The 140 field is NULL if there is no size. */ 141 symbolS *size; 142 /* For a csect symbol, the last symbol which has been defined in 143 this csect, or NULL if none have been defined so far. For a .bs 144 symbol, the referenced csect symbol. */ 145 symbolS *within; 146}; 147 148#define TC_SYMFIELD_TYPE struct ppc_tc_sy 149 150/* We need an additional auxent for function symbols. */ 151#define OBJ_COFF_MAX_AUXENTRIES 2 152 153/* Square and curly brackets are permitted in symbol names. */ 154#define LEX_BR 3 155 156/* Canonicalize the symbol name. */ 157#define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name) 158extern char *ppc_canonicalize_symbol_name PARAMS ((char *)); 159 160/* Get the symbol class from the name. */ 161#define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym) 162extern void ppc_symbol_new_hook PARAMS ((symbolS *)); 163 164/* Set the symbol class of a label based on the csect. */ 165#define tc_frob_label(sym) ppc_frob_label (sym) 166extern void ppc_frob_label PARAMS ((symbolS *)); 167 168/* TOC relocs requires special handling. */ 169#define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) 170extern int ppc_fix_adjustable PARAMS ((struct fix *)); 171 172/* A relocation from one csect to another must be kept. */ 173#define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP) 174extern int ppc_force_relocation PARAMS ((struct fix *)); 175 176/* We need to set the section VMA. */ 177#define tc_frob_section(sec) ppc_frob_section (sec) 178extern void ppc_frob_section PARAMS ((asection *)); 179 180/* Finish up the symbol. */ 181#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) 182extern int ppc_frob_symbol PARAMS ((symbolS *)); 183 184/* Finish up the entire symtab. */ 185#define tc_adjust_symtab() ppc_adjust_symtab () 186extern void ppc_adjust_symtab PARAMS ((void)); 187 188/* Niclas Andersson <nican@ida.liu.se> says this is needed. */ 189#define SUB_SEGMENT_ALIGN(SEG) 2 190 191/* We also need to copy, in particular, the class of the symbol, 192 over what obj-coff would otherwise have copied. */ 193#define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src) \ 194do { \ 195 if (SF_GET_GET_SEGMENT (dest)) \ 196 S_SET_SEGMENT (dest, S_GET_SEGMENT (src)); \ 197 symbol_get_tc (dest)->size = symbol_get_tc (src)->size; \ 198 symbol_get_tc (dest)->align = symbol_get_tc (src)->align; \ 199 symbol_get_tc (dest)->class = symbol_get_tc (src)->class; \ 200 symbol_get_tc (dest)->within = symbol_get_tc (src)->within; \ 201} while (0) 202 203 204#endif /* OBJ_XCOFF */ 205 206#ifdef OBJ_ELF 207 208/* Branch prediction relocations must force relocation, as must 209 the vtable description relocs. */ 210#define TC_FORCE_RELOCATION(FIXP) \ 211((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \ 212 || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \ 213 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \ 214 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN \ 215 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT \ 216 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 217 218#define TC_FORCE_RELOCATION_SECTION(FIXP,SEC) \ 219(TC_FORCE_RELOCATION (FIXP) \ 220 || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy \ 221 && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC)) 222 223/* Support for SHF_EXCLUDE and SHT_ORDERED */ 224extern int ppc_section_letter PARAMS ((int, char **)); 225extern int ppc_section_type PARAMS ((char *, size_t)); 226extern int ppc_section_word PARAMS ((char *, size_t)); 227extern int ppc_section_flags PARAMS ((int, int, int)); 228 229#define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) 230#define md_elf_section_type(STR, LEN) ppc_section_type (STR, LEN) 231#define md_elf_section_word(STR, LEN) ppc_section_word (STR, LEN) 232#define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE) 233 234/* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a 235 normal section, and not a bss section so that the linker doesn't crater 236 when trying to make more than 2 sections. */ 237#define ELF_TC_SPECIAL_SECTIONS \ 238 { ".tags", SHT_ORDERED, SHF_ALLOC }, \ 239 { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, \ 240 { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, \ 241 { ".sdata2", SHT_PROGBITS, SHF_ALLOC }, \ 242 { ".sbss2", SHT_PROGBITS, SHF_ALLOC }, \ 243 { ".PPC.EMB.sdata0", SHT_PROGBITS, SHF_ALLOC }, \ 244 { ".PPC.EMB.sbss0", SHT_PROGBITS, SHF_ALLOC }, 245 246#define tc_comment_chars ppc_comment_chars 247extern const char *ppc_comment_chars; 248 249/* Keep relocations relative to the GOT, or non-PC relative. */ 250#define tc_fix_adjustable(FIX) \ 251 ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF \ 252 && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF \ 253 && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF \ 254 && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF \ 255 && (FIX)->fx_r_type != BFD_RELOC_GPREL16 \ 256 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT \ 257 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY \ 258 && ! S_IS_EXTERNAL ((FIX)->fx_addsy) \ 259 && ! S_IS_WEAK ((FIX)->fx_addsy) \ 260 && ((FIX)->fx_pcrel \ 261 || ((FIX)->fx_subsy != NULL \ 262 && (S_GET_SEGMENT ((FIX)->fx_subsy) \ 263 == S_GET_SEGMENT ((FIX)->fx_addsy))) \ 264 || S_IS_LOCAL ((FIX)->fx_addsy))) 265 266/* We must never ever try to resolve references to externally visible 267 symbols in the assembler, because the .o file might go into a shared 268 library, and some other shared library might override that symbol. */ 269#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ 270 ((FIX)->fx_addsy == NULL \ 271 || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ 272 && ! S_IS_WEAK ((FIX)->fx_addsy) \ 273 && S_IS_DEFINED ((FIX)->fx_addsy) \ 274 && ! S_IS_COMMON ((FIX)->fx_addsy))) 275 276#endif /* OBJ_ELF */ 277 278/* call md_apply_fix3 with segment instead of md_apply_fix */ 279#define MD_APPLY_FIX3 280 281/* call md_pcrel_from_section, not md_pcrel_from */ 282#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC) 283extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); 284 285#define md_parse_name(name, exp) ppc_parse_name (name, exp) 286extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); 287 288#define md_operand(x) 289 290