tc-ppc.h revision 104834
1/* tc-ppc.h -- Header file for tc-ppc.c. 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 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 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 unsigned 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 } 112 113 114#ifdef TE_PE 115 116/* Question marks are permitted in symbol names. */ 117#define LEX_QM 1 118 119/* Don't adjust TOC relocs. */ 120#define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp) 121extern int ppc_pe_fix_adjustable PARAMS ((struct fix *)); 122 123#endif 124 125#ifdef OBJ_XCOFF 126 127/* Declarations needed when generating XCOFF code. XCOFF is an 128 extension of COFF, used only on the RS/6000. Rather than create an 129 obj-xcoff, we just use obj-coff, and handle the extensions here in 130 tc-ppc. */ 131 132/* We need to keep some information for symbols. */ 133struct ppc_tc_sy 134{ 135 /* We keep a few linked lists of symbols. */ 136 symbolS *next; 137 /* Non-zero if the symbol should be output. The RS/6000 assembler 138 only outputs symbols that are external or are mentioned in a 139 .globl or .lglobl statement. */ 140 int output; 141 /* The symbol class. */ 142 int class; 143 /* The real name, if the symbol was renamed. */ 144 char *real_name; 145 /* For a csect symbol, the subsegment we are using. This is zero 146 for symbols that are not csects. */ 147 subsegT subseg; 148 /* For a csect or common symbol, the alignment to use. */ 149 int align; 150 /* For a function symbol, a symbol whose value is the size. The 151 field is NULL if there is no size. */ 152 symbolS *size; 153 /* For a csect symbol, the last symbol which has been defined in 154 this csect, or NULL if none have been defined so far. For a .bs 155 symbol, the referenced csect symbol. */ 156 symbolS *within; 157}; 158 159#define TC_SYMFIELD_TYPE struct ppc_tc_sy 160 161/* We need an additional auxent for function symbols. */ 162#define OBJ_COFF_MAX_AUXENTRIES 2 163 164/* Square and curly brackets are permitted in symbol names. */ 165#define LEX_BR 3 166 167/* Canonicalize the symbol name. */ 168#define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name) 169extern char *ppc_canonicalize_symbol_name PARAMS ((char *)); 170 171/* Get the symbol class from the name. */ 172#define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym) 173extern void ppc_symbol_new_hook PARAMS ((symbolS *)); 174 175/* Set the symbol class of a label based on the csect. */ 176#define tc_frob_label(sym) ppc_frob_label (sym) 177extern void ppc_frob_label PARAMS ((symbolS *)); 178 179/* TOC relocs requires special handling. */ 180#define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) 181extern int ppc_fix_adjustable PARAMS ((struct fix *)); 182 183/* A relocation from one csect to another must be kept. */ 184#define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP) 185extern int ppc_force_relocation PARAMS ((struct fix *)); 186 187/* We need to set the section VMA. */ 188#define tc_frob_section(sec) ppc_frob_section (sec) 189extern void ppc_frob_section PARAMS ((asection *)); 190 191/* Finish up the symbol. */ 192#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) 193extern int ppc_frob_symbol PARAMS ((symbolS *)); 194 195/* Finish up the entire symtab. */ 196#define tc_adjust_symtab() ppc_adjust_symtab () 197extern void ppc_adjust_symtab PARAMS ((void)); 198 199/* We also need to copy, in particular, the class of the symbol, 200 over what obj-coff would otherwise have copied. */ 201#define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src) \ 202do { \ 203 if (SF_GET_GET_SEGMENT (dest)) \ 204 S_SET_SEGMENT (dest, S_GET_SEGMENT (src)); \ 205 symbol_get_tc (dest)->size = symbol_get_tc (src)->size; \ 206 symbol_get_tc (dest)->align = symbol_get_tc (src)->align; \ 207 symbol_get_tc (dest)->class = symbol_get_tc (src)->class; \ 208 symbol_get_tc (dest)->within = symbol_get_tc (src)->within; \ 209} while (0) 210 211#endif /* OBJ_XCOFF */ 212 213#ifdef OBJ_ELF 214 215/* Branch prediction relocations must force relocation, as must 216 the vtable description relocs. */ 217#define TC_FORCE_RELOCATION(FIXP) \ 218((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \ 219 || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \ 220 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \ 221 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN \ 222 || (FIXP)->fx_r_type == BFD_RELOC_PPC64_TOC \ 223 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT \ 224 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 225 226#define TC_FORCE_RELOCATION_SECTION(FIXP,SEC) \ 227(TC_FORCE_RELOCATION (FIXP) \ 228 || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy \ 229 && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC)) 230 231/* Support for SHF_EXCLUDE and SHT_ORDERED */ 232extern int ppc_section_letter PARAMS ((int, char **)); 233extern int ppc_section_type PARAMS ((char *, size_t)); 234extern int ppc_section_word PARAMS ((char *, size_t)); 235extern int ppc_section_flags PARAMS ((int, int, int)); 236 237#define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) 238#define md_elf_section_type(STR, LEN) ppc_section_type (STR, LEN) 239#define md_elf_section_word(STR, LEN) ppc_section_word (STR, LEN) 240#define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE) 241 242/* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a 243 normal section, and not a bss section so that the linker doesn't crater 244 when trying to make more than 2 sections. */ 245#define ELF_TC_SPECIAL_SECTIONS \ 246 { ".tags", SHT_ORDERED, SHF_ALLOC }, \ 247 { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, \ 248 { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, \ 249 { ".sdata2", SHT_PROGBITS, SHF_ALLOC }, \ 250 { ".sbss2", SHT_PROGBITS, SHF_ALLOC }, \ 251 { ".PPC.EMB.sdata0", SHT_PROGBITS, SHF_ALLOC }, \ 252 { ".PPC.EMB.sbss0", SHT_PROGBITS, SHF_ALLOC }, \ 253 /* Extra sections for 64-bit ELF PPC. */ \ 254 { ".toc", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE}, \ 255 { ".tocbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE}, 256 257#define tc_comment_chars ppc_comment_chars 258extern const char *ppc_comment_chars; 259 260/* Keep relocations relative to the GOT, or non-PC relative. */ 261#define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) 262extern int ppc_fix_adjustable PARAMS ((struct fix *)); 263 264/* We must never ever try to resolve references to externally visible 265 symbols in the assembler, because the .o file might go into a shared 266 library, and some other shared library might override that symbol. */ 267#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ 268 ((FIX)->fx_addsy == NULL \ 269 || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ 270 && ! S_IS_WEAK ((FIX)->fx_addsy) \ 271 && S_IS_DEFINED ((FIX)->fx_addsy) \ 272 && ! S_IS_COMMON ((FIX)->fx_addsy))) 273 274#define tc_frob_file_before_adjust ppc_frob_file_before_adjust 275extern void ppc_frob_file_before_adjust PARAMS ((void)); 276 277#define DWARF2_LINE_MIN_INSN_LENGTH 4 278#endif /* OBJ_ELF */ 279 280/* call md_pcrel_from_section, not md_pcrel_from */ 281#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC) 282extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); 283 284#define md_parse_name(name, exp, c) ppc_parse_name (name, exp) 285extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); 286 287#define md_operand(x) 288