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252b5132 | 1 | /* tc-ppc.h -- Header file for tc-ppc.c. |
2c1c4c62 GK |
2 | Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
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 | |
81d4177b | 21 | 02111-1307, USA. */ |
252b5132 RH |
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 ()) | |
7f6d05e8 | 50 | #define TARGET_MACH (ppc_mach ()) |
252b5132 | 51 | extern enum bfd_architecture ppc_arch PARAMS ((void)); |
7f6d05e8 | 52 | extern unsigned long ppc_mach PARAMS ((void)); |
252b5132 RH |
53 | |
54 | /* Whether or not the target is big endian */ | |
55 | extern int target_big_endian; | |
56 | ||
57 | /* The target BFD format. */ | |
7f6d05e8 CP |
58 | #define TARGET_FORMAT (ppc_target_format ()) |
59 | extern char* ppc_target_format (); | |
252b5132 RH |
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 | \f | |
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) | |
95 | extern 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. */ | |
107 | struct ppc_tc_sy | |
108 | { | |
109 | /* We keep a few linked lists of symbols. */ | |
49309057 | 110 | symbolS *next; |
252b5132 RH |
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. */ | |
49309057 | 126 | symbolS *size; |
252b5132 RH |
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. */ | |
49309057 | 130 | symbolS *within; |
252b5132 RH |
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) | |
143 | extern 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) | |
49309057 | 147 | extern void ppc_symbol_new_hook PARAMS ((symbolS *)); |
252b5132 RH |
148 | |
149 | /* Set the symbol class of a label based on the csect. */ | |
150 | #define tc_frob_label(sym) ppc_frob_label (sym) | |
49309057 | 151 | extern void ppc_frob_label PARAMS ((symbolS *)); |
252b5132 RH |
152 | |
153 | /* TOC relocs requires special handling. */ | |
154 | #define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp) | |
155 | extern 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) | |
159 | extern 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) | |
163 | extern void ppc_frob_section PARAMS ((asection *)); | |
164 | ||
165 | /* Finish up the symbol. */ | |
166 | #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym) | |
49309057 | 167 | extern int ppc_frob_symbol PARAMS ((symbolS *)); |
252b5132 RH |
168 | |
169 | /* Finish up the entire symtab. */ | |
170 | #define tc_adjust_symtab() ppc_adjust_symtab () | |
171 | extern void ppc_adjust_symtab PARAMS ((void)); | |
172 | ||
173 | /* Niclas Andersson <nican@ida.liu.se> says this is needed. */ | |
7f6d05e8 CP |
174 | extern int ppc_subseg_align PARAMS ((void)); |
175 | #define SUB_SEGMENT_ALIGN(SEG) ppc_subseg_align() | |
252b5132 | 176 | |
2c1c4c62 GK |
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) \ | |
180 | do { \ | |
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 | ||
252b5132 RH |
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) \ | |
49309057 ILT |
205 | || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy \ |
206 | && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC)) | |
252b5132 RH |
207 | |
208 | /* Support for SHF_EXCLUDE and SHT_ORDERED */ | |
209 | extern int ppc_section_letter PARAMS ((int, char **)); | |
9de8d8f1 RH |
210 | extern int ppc_section_type PARAMS ((char *, size_t)); |
211 | extern int ppc_section_word PARAMS ((char *, size_t)); | |
252b5132 RH |
212 | extern int ppc_section_flags PARAMS ((int, int, int)); |
213 | ||
214 | #define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG) | |
9de8d8f1 RH |
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) | |
252b5132 RH |
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 | |
232 | extern const char *ppc_comment_chars; | |
233 | ||
81d4177b | 234 | /* Keep relocations relative to the GOT, or non-PC relative. */ |
252b5132 RH |
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))) \ | |
e0accf0c | 249 | || S_IS_LOCAL ((FIX)->fx_addsy))) |
252b5132 RH |
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 | #endif /* OBJ_ELF */ | |
262 | ||
263 | /* call md_apply_fix3 with segment instead of md_apply_fix */ | |
264 | #define MD_APPLY_FIX3 | |
265 | ||
266 | /* call md_pcrel_from_section, not md_pcrel_from */ | |
267 | #define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC) | |
268 | extern long md_pcrel_from_section PARAMS ((struct fix *, segT)); | |
269 | ||
270 | #define md_parse_name(name, exp) ppc_parse_name (name, exp) | |
271 | extern int ppc_parse_name PARAMS ((const char *, struct expressionS *)); | |
272 | ||
273 | #define md_operand(x) |