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1 | /* tc-ppc.h -- Header file for tc-ppc.c. |
2 | Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor, Cygnus Support. | |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
7 | GAS is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GAS is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #define TC_PPC | |
23 | ||
24 | #ifdef ANSI_PROTOTYPES | |
25 | struct fix; | |
26 | #endif | |
27 | ||
28 | /* Set the endianness we are using. Default to big endian. */ | |
29 | #ifndef TARGET_BYTES_BIG_ENDIAN | |
30 | #define TARGET_BYTES_BIG_ENDIAN 1 | |
31 | #endif | |
32 | ||
33 | #ifndef BFD_ASSEMBLER | |
34 | #error PowerPC support requires BFD_ASSEMBLER | |
35 | #endif | |
36 | ||
37 | /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling | |
38 | XCOFF for AIX or PowerMac. If TE_PE is defined, we are assembling | |
39 | COFF for Windows NT. */ | |
40 | ||
41 | #ifdef OBJ_COFF | |
42 | #ifndef TE_PE | |
43 | #define OBJ_XCOFF | |
44 | #endif | |
45 | #endif | |
46 | ||
47 | /* The target BFD architecture. */ | |
48 | #define TARGET_ARCH (ppc_arch ()) | |
49 | extern enum bfd_architecture ppc_arch PARAMS ((void)); | |
50 | ||
51 | /* Whether or not the target is big endian */ | |
52 | extern int target_big_endian; | |
53 | ||
54 | /* The target BFD format. */ | |
55 | #ifdef OBJ_COFF | |
56 | #ifdef TE_PE | |
57 | #define TARGET_FORMAT (target_big_endian ? "pe-powerpc" : "pe-powerpcle") | |
58 | #else | |
59 | #define TARGET_FORMAT "aixcoff-rs6000" | |
60 | #endif | |
61 | #endif | |
62 | ||
63 | /* PowerMac has a BFD slightly different from AIX's. */ | |
64 | #ifdef TE_POWERMAC | |
65 | #ifdef TARGET_FORMAT | |
66 | #undef TARGET_FORMAT | |
67 | #endif | |
68 | #define TARGET_FORMAT "xcoff-powermac" | |
69 | #endif | |
70 | ||
71 | #ifdef OBJ_ELF | |
72 | #define TARGET_FORMAT (target_big_endian ? "elf32-powerpc" : "elf32-powerpcle") | |
73 | #endif | |
74 | ||
75 | /* Permit temporary numeric labels. */ | |
76 | #define LOCAL_LABELS_FB 1 | |
77 | ||
78 | /* $ is used to refer to the current location. */ | |
79 | #define DOLLAR_DOT | |
80 | ||
81 | /* Strings do not use backslash escapes under COFF. */ | |
82 | #ifdef OBJ_COFF | |
83 | #define NO_STRING_ESCAPES | |
84 | #endif | |
85 | ||
86 | #ifdef OBJ_ELF | |
87 | #define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */ | |
88 | #endif | |
89 | ||
90 | #if TARGET_BYTES_BIG_ENDIAN | |
91 | #define PPC_BIG_ENDIAN 1 | |
92 | #else | |
93 | #define PPC_BIG_ENDIAN 0 | |
94 | #endif | |
95 | ||
96 | /* We don't need to handle .word strangely. */ | |
97 | #define WORKING_DOT_WORD | |
98 | ||
99 | /* We set the fx_done field appropriately in md_apply_fix. */ | |
100 | #define TC_HANDLES_FX_DONE | |
101 | \f | |
102 | #ifdef TE_PE | |
103 | ||
104 | /* Question marks are permitted in symbol names. */ | |
105 | #define LEX_QM 1 | |
106 | ||
107 | /* Don't adjust TOC relocs. */ | |
108 | #define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp) | |
109 | extern int ppc_pe_fix_adjustable PARAMS ((struct fix *)); | |
110 | ||
111 | #endif | |
112 | ||
113 | #ifdef OBJ_XCOFF | |
114 | ||
115 | /* Declarations needed when generating XCOFF code. XCOFF is an | |
116 | extension of COFF, used only on the RS/6000. Rather than create an | |
117 | obj-xcoff, we just use obj-coff, and handle the extensions here in | |
118 | tc-ppc. */ | |
119 | ||
120 | /* We need to keep some information for symbols. */ | |
121 | struct ppc_tc_sy | |
122 | { | |
123 | /* We keep a few linked lists of symbols. */ | |
124 | struct symbol *next; | |
125 | /* Non-zero if the symbol should be output. The RS/6000 assembler | |
126 | only outputs symbols that are external or are mentioned in a | |
127 | .globl or .lglobl statement. */ | |
128 | int output; | |
129 | /* The symbol class. */ | |
130 | int class; | |
131 | /* The real name, if the symbol was renamed. */ | |
132 | char *real_name; | |
133 | /* For a csect symbol, the subsegment we are using. This is zero | |
134 | for symbols that are not csects. */ | |
135 | subsegT subseg; | |
136 | /* For a csect or common symbol, the alignment to use. */ | |
137 | int align; | |
138 | /* For a function symbol, a symbol whose value is the size. The | |
139 | field is NULL if there is no size. */ | |
140 | struct symbol *size; | |
141 | /* For a csect symbol, the last symbol which has been defined in | |
142 | this csect, or NULL if none have been defined so far. For a .bs | |
143 | symbol, the referenced csect symbol. */ | |
144 | struct symbol *within; | |
145 | }; | |
146 | ||
147 | #define TC_SYMFIELD_TYPE struct ppc_tc_sy | |
148 | ||
149 | /* We need an additional auxent for function symbols. */ | |
150 | #define OBJ_COFF_MAX_AUXENTRIES 2 | |
151 | ||
152 | /* Square and curly brackets are permitted in symbol names. */ | |
153 | #define LEX_BR 3 | |
154 | ||
155 | /* Canonicalize the symbol name. */ | |
156 | #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name) | |
157 | extern char *ppc_canonicalize_symbol_name PARAMS ((char *)); | |
158 | ||
159 | /* Get the symbol class from the name. */ | |
160 | #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym) | |
161 | extern void ppc_symbol_new_hook PARAMS ((struct symbol *)); | |
162 | ||
163 | /* Set the symbol class of a label based on the csect. */ | |
164 | #define tc_frob_label(sym) ppc_frob_label (sym) | |
165 | extern void ppc_frob_label PARAMS ((struct symbol *)); | |
166 | ||
167 | /* TOC relocs requires special handling. */ | |
168 | #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) | |
169 | extern int ppc_fix_adjustable PARAMS ((struct fix *)); | |
170 | ||
171 | /* A relocation from one csect to another must be kept. */ | |
172 | #define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP) | |
173 | extern int ppc_force_relocation PARAMS ((struct fix *)); | |
174 | ||
175 | /* We need to set the section VMA. */ | |
176 | #define tc_frob_section(sec) ppc_frob_section (sec) | |
177 | extern void ppc_frob_section PARAMS ((asection *)); | |
178 | ||
179 | /* Finish up the symbol. */ | |
180 | #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) | |
181 | extern int ppc_frob_symbol PARAMS ((struct symbol *)); | |
182 | ||
183 | /* Finish up the entire symtab. */ | |
184 | #define tc_adjust_symtab() ppc_adjust_symtab () | |
185 | extern void ppc_adjust_symtab PARAMS ((void)); | |
186 | ||
187 | /* Niclas Andersson <nican@ida.liu.se> says this is needed. */ | |
188 | #define SUB_SEGMENT_ALIGN(SEG) 2 | |
189 | ||
190 | #endif /* OBJ_XCOFF */ | |
191 | ||
192 | #ifdef OBJ_ELF | |
193 | ||
194 | /* Branch prediction relocations must force relocation, as must | |
195 | the vtable description relocs. */ | |
196 | #define TC_FORCE_RELOCATION(FIXP) \ | |
197 | ((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \ | |
198 | || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \ | |
199 | || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \ | |
200 | || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN \ | |
201 | || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT \ | |
202 | || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
203 | ||
204 | #define TC_FORCE_RELOCATION_SECTION(FIXP,SEC) \ | |
205 | (TC_FORCE_RELOCATION (FIXP) \ | |
206 | || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy && (FIXP)->fx_addsy->bsym \ | |
207 | && (FIXP)->fx_addsy->bsym->section != SEC)) | |
208 | ||
209 | /* Support for SHF_EXCLUDE and SHT_ORDERED */ | |
210 | extern int ppc_section_letter PARAMS ((int, char **)); | |
211 | extern int ppc_section_type PARAMS ((char **)); | |
212 | extern int ppc_section_word PARAMS ((char **)); | |
213 | extern int ppc_section_flags PARAMS ((int, int, int)); | |
214 | ||
215 | #define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) | |
216 | #define md_elf_section_type(PTR_STR) ppc_section_type (PTR_STR) | |
217 | #define md_elf_section_word(PTR_STR) ppc_section_word (PTR_STR) | |
218 | #define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE) | |
219 | ||
220 | /* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a | |
221 | normal section, and not a bss section so that the linker doesn't crater | |
222 | when trying to make more than 2 sections. */ | |
223 | #define ELF_TC_SPECIAL_SECTIONS \ | |
224 | { ".tags", SHT_ORDERED, SHF_ALLOC }, \ | |
225 | { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, \ | |
226 | { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, \ | |
227 | { ".sdata2", SHT_PROGBITS, SHF_ALLOC }, \ | |
228 | { ".sbss2", SHT_PROGBITS, SHF_ALLOC }, \ | |
229 | { ".PPC.EMB.sdata0", SHT_PROGBITS, SHF_ALLOC }, \ | |
230 | { ".PPC.EMB.sbss0", SHT_PROGBITS, SHF_ALLOC }, | |
231 | ||
232 | #define tc_comment_chars ppc_comment_chars | |
233 | extern const char *ppc_comment_chars; | |
234 | ||
235 | /* Keep relocations relative to the GOT, or non-PC relative. */ | |
236 | #define tc_fix_adjustable(FIX) \ | |
237 | ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF \ | |
238 | && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF \ | |
239 | && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF \ | |
240 | && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF \ | |
241 | && (FIX)->fx_r_type != BFD_RELOC_GPREL16 \ | |
242 | && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT \ | |
243 | && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY \ | |
244 | && ! S_IS_EXTERNAL ((FIX)->fx_addsy) \ | |
245 | && ! S_IS_WEAK ((FIX)->fx_addsy) \ | |
246 | && ((FIX)->fx_pcrel \ | |
247 | || ((FIX)->fx_subsy != NULL \ | |
248 | && (S_GET_SEGMENT ((FIX)->fx_subsy) \ | |
249 | == S_GET_SEGMENT ((FIX)->fx_addsy))) \ | |
250 | || strchr (S_GET_NAME ((FIX)->fx_addsy), '\001') != NULL \ | |
251 | || strchr (S_GET_NAME ((FIX)->fx_addsy), '\002') != NULL)) | |
252 | ||
253 | /* We must never ever try to resolve references to externally visible | |
254 | symbols in the assembler, because the .o file might go into a shared | |
255 | library, and some other shared library might override that symbol. */ | |
256 | #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \ | |
257 | ((FIX)->fx_addsy == NULL \ | |
258 | || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \ | |
259 | && ! S_IS_WEAK ((FIX)->fx_addsy) \ | |
260 | && S_IS_DEFINED ((FIX)->fx_addsy) \ | |
261 | && ! S_IS_COMMON ((FIX)->fx_addsy))) | |
262 | ||
263 | #endif /* OBJ_ELF */ | |
264 | ||
265 | /* call md_apply_fix3 with segment instead of md_apply_fix */ | |
266 | #define MD_APPLY_FIX3 | |
267 | ||
268 | /* call md_pcrel_from_section, not md_pcrel_from */ | |
269 | #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC) | |
270 | extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); | |
271 | ||
272 | #define md_parse_name(name, exp) ppc_parse_name (name, exp) | |
273 | extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); | |
274 | ||
275 | #define md_operand(x) | |
276 |