tc-ppc.h revision 78828
1/* tc-ppc.h -- Header file for tc-ppc.c. 2 Copyright 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 ()) 50#define TARGET_MACH (ppc_mach ()) 51extern enum bfd_architecture ppc_arch PARAMS ((void)); 52extern unsigned long ppc_mach PARAMS ((void)); 53 54/* Whether or not the target is big endian */ 55extern int target_big_endian; 56 57/* The target BFD format. */ 58#define TARGET_FORMAT (ppc_target_format ()) 59extern char* ppc_target_format (); 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/* We set the fx_done field appropriately in md_apply_fix. */ 86#define TC_HANDLES_FX_DONE 87 88#ifdef TE_PE 89 90/* Question marks are permitted in symbol names. */ 91#define LEX_QM 1 92 93/* Don't adjust TOC relocs. */ 94#define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp) 95extern int ppc_pe_fix_adjustable PARAMS ((struct fix *)); 96 97#endif 98 99#ifdef OBJ_XCOFF 100 101/* Declarations needed when generating XCOFF code. XCOFF is an 102 extension of COFF, used only on the RS/6000. Rather than create an 103 obj-xcoff, we just use obj-coff, and handle the extensions here in 104 tc-ppc. */ 105 106/* We need to keep some information for symbols. */ 107struct ppc_tc_sy 108{ 109 /* We keep a few linked lists of symbols. */ 110 symbolS *next; 111 /* Non-zero if the symbol should be output. The RS/6000 assembler 112 only outputs symbols that are external or are mentioned in a 113 .globl or .lglobl statement. */ 114 int output; 115 /* The symbol class. */ 116 int class; 117 /* The real name, if the symbol was renamed. */ 118 char *real_name; 119 /* For a csect symbol, the subsegment we are using. This is zero 120 for symbols that are not csects. */ 121 subsegT subseg; 122 /* For a csect or common symbol, the alignment to use. */ 123 int align; 124 /* For a function symbol, a symbol whose value is the size. The 125 field is NULL if there is no size. */ 126 symbolS *size; 127 /* For a csect symbol, the last symbol which has been defined in 128 this csect, or NULL if none have been defined so far. For a .bs 129 symbol, the referenced csect symbol. */ 130 symbolS *within; 131}; 132 133#define TC_SYMFIELD_TYPE struct ppc_tc_sy 134 135/* We need an additional auxent for function symbols. */ 136#define OBJ_COFF_MAX_AUXENTRIES 2 137 138/* Square and curly brackets are permitted in symbol names. */ 139#define LEX_BR 3 140 141/* Canonicalize the symbol name. */ 142#define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name) 143extern char *ppc_canonicalize_symbol_name PARAMS ((char *)); 144 145/* Get the symbol class from the name. */ 146#define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym) 147extern void ppc_symbol_new_hook PARAMS ((symbolS *)); 148 149/* Set the symbol class of a label based on the csect. */ 150#define tc_frob_label(sym) ppc_frob_label (sym) 151extern void ppc_frob_label PARAMS ((symbolS *)); 152 153/* TOC relocs requires special handling. */ 154#define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) 155extern int ppc_fix_adjustable PARAMS ((struct fix *)); 156 157/* A relocation from one csect to another must be kept. */ 158#define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP) 159extern int ppc_force_relocation PARAMS ((struct fix *)); 160 161/* We need to set the section VMA. */ 162#define tc_frob_section(sec) ppc_frob_section (sec) 163extern void ppc_frob_section PARAMS ((asection *)); 164 165/* Finish up the symbol. */ 166#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) 167extern int ppc_frob_symbol PARAMS ((symbolS *)); 168 169/* Finish up the entire symtab. */ 170#define tc_adjust_symtab() ppc_adjust_symtab () 171extern void ppc_adjust_symtab PARAMS ((void)); 172 173/* Niclas Andersson <nican@ida.liu.se> says this is needed. */ 174extern int ppc_subseg_align PARAMS ((void)); 175#define SUB_SEGMENT_ALIGN(SEG) ppc_subseg_align() 176 177/* We also need to copy, in particular, the class of the symbol, 178 over what obj-coff would otherwise have copied. */ 179#define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src) \ 180do { \ 181 if (SF_GET_GET_SEGMENT (dest)) \ 182 S_SET_SEGMENT (dest, S_GET_SEGMENT (src)); \ 183 symbol_get_tc (dest)->size = symbol_get_tc (src)->size; \ 184 symbol_get_tc (dest)->align = symbol_get_tc (src)->align; \ 185 symbol_get_tc (dest)->class = symbol_get_tc (src)->class; \ 186 symbol_get_tc (dest)->within = symbol_get_tc (src)->within; \ 187} while (0) 188 189#endif /* OBJ_XCOFF */ 190 191#ifdef OBJ_ELF 192 193/* Branch prediction relocations must force relocation, as must 194 the vtable description relocs. */ 195#define TC_FORCE_RELOCATION(FIXP) \ 196((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \ 197 || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \ 198 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \ 199 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN \ 200 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT \ 201 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 202 203#define TC_FORCE_RELOCATION_SECTION(FIXP,SEC) \ 204(TC_FORCE_RELOCATION (FIXP) \ 205 || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy \ 206 && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC)) 207 208/* Support for SHF_EXCLUDE and SHT_ORDERED */ 209extern int ppc_section_letter PARAMS ((int, char **)); 210extern int ppc_section_type PARAMS ((char *, size_t)); 211extern int ppc_section_word PARAMS ((char *, size_t)); 212extern int ppc_section_flags PARAMS ((int, int, int)); 213 214#define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) 215#define md_elf_section_type(STR, LEN) ppc_section_type (STR, LEN) 216#define md_elf_section_word(STR, LEN) ppc_section_word (STR, LEN) 217#define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE) 218 219/* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a 220 normal section, and not a bss section so that the linker doesn't crater 221 when trying to make more than 2 sections. */ 222#define ELF_TC_SPECIAL_SECTIONS \ 223 { ".tags", SHT_ORDERED, SHF_ALLOC }, \ 224 { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, \ 225 { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, \ 226 { ".sdata2", SHT_PROGBITS, SHF_ALLOC }, \ 227 { ".sbss2", SHT_PROGBITS, SHF_ALLOC }, \ 228 { ".PPC.EMB.sdata0", SHT_PROGBITS, SHF_ALLOC }, \ 229 { ".PPC.EMB.sbss0", SHT_PROGBITS, SHF_ALLOC }, 230 231#define tc_comment_chars ppc_comment_chars 232extern const char *ppc_comment_chars; 233 234/* Keep relocations relative to the GOT, or non-PC relative. */ 235#define tc_fix_adjustable(FIX) \ 236 ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF \ 237 && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF \ 238 && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF \ 239 && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF \ 240 && (FIX)->fx_r_type != BFD_RELOC_GPREL16 \ 241 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT \ 242 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY \ 243 && ! S_IS_EXTERNAL ((FIX)->fx_addsy) \ 244 && ! S_IS_WEAK ((FIX)->fx_addsy) \ 245 && ((FIX)->fx_pcrel \ 246 || ((FIX)->fx_subsy != NULL \ 247 && (S_GET_SEGMENT ((FIX)->fx_subsy) \ 248 == S_GET_SEGMENT ((FIX)->fx_addsy))) \ 249 || S_IS_LOCAL ((FIX)->fx_addsy))) 250 251/* We must never ever try to resolve references to externally visible 252 symbols in the assembler, because the .o file might go into a shared 253 library, and some other shared library might override that symbol. */ 254#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ 255 ((FIX)->fx_addsy == NULL \ 256 || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ 257 && ! S_IS_WEAK ((FIX)->fx_addsy) \ 258 && S_IS_DEFINED ((FIX)->fx_addsy) \ 259 && ! S_IS_COMMON ((FIX)->fx_addsy))) 260 261#define DWARF2_LINE_MIN_INSN_LENGTH 4 262#endif /* OBJ_ELF */ 263 264/* call md_apply_fix3 with segment instead of md_apply_fix */ 265#define MD_APPLY_FIX3 266 267/* call md_pcrel_from_section, not md_pcrel_from */ 268#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC) 269extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); 270 271#define md_parse_name(name, exp) ppc_parse_name (name, exp) 272extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); 273 274#define md_operand(x) 275