1 /* tc-ppc.h -- Header file for tc-ppc.c.
2    Copyright (C) 1994-2016 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
20    02110-1301, USA.  */
21 
22 #define TC_PPC
23 
24 #include "opcode/ppc.h"
25 
26 struct fix;
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 /* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
34    XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
35    COFF for Windows NT.  */
36 
37 #ifdef OBJ_COFF
38 #ifndef TE_PE
39 #define OBJ_XCOFF
40 #endif
41 #endif
42 
43 /* The target BFD architecture.  */
44 #define TARGET_ARCH (ppc_arch ())
45 #define TARGET_MACH (ppc_mach ())
46 extern enum bfd_architecture ppc_arch (void);
47 extern unsigned long ppc_mach (void);
48 
49 /* Whether or not the target is big endian */
50 extern int target_big_endian;
51 
52 /* The target BFD format.  */
53 #define TARGET_FORMAT (ppc_target_format ())
54 extern const char *ppc_target_format (void);
55 
56 /* Permit temporary numeric labels.  */
57 #define LOCAL_LABELS_FB 1
58 
59 /* $ is used to refer to the current location.  */
60 #define DOLLAR_DOT
61 
62 /* Strings do not use backslash escapes under COFF.  */
63 #ifdef OBJ_COFF
64 #define NO_STRING_ESCAPES
65 #endif
66 
67 #ifdef OBJ_ELF
68 #define DIFF_EXPR_OK		/* foo-. gets turned into PC relative relocs */
69 #endif
70 
71 #if TARGET_BYTES_BIG_ENDIAN
72 #define PPC_BIG_ENDIAN 1
73 #else
74 #define PPC_BIG_ENDIAN 0
75 #endif
76 
77 /* We don't need to handle .word strangely.  */
78 #define WORKING_DOT_WORD
79 
80 #define MAX_MEM_FOR_RS_ALIGN_CODE 4
81 #define HANDLE_ALIGN(FRAGP)						\
82   if ((FRAGP)->fr_type == rs_align_code)				\
83     ppc_handle_align (FRAGP);
84 
85 extern void ppc_handle_align (struct frag *);
86 extern void ppc_frag_check (struct frag *);
87 
88 #ifdef OBJ_ELF
89 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
90 #endif
91 
92 #define md_frag_check(FRAGP) ppc_frag_check (FRAGP)
93 
94 /* Arrange to store the value of ppc_cpu at the site of a fixup
95    for later use in md_apply_fix.  */
96 struct _ppc_fix_extra
97 {
98   ppc_cpu_t ppc_cpu;
99 };
100 
101 extern ppc_cpu_t ppc_cpu;
102 
103 #define TC_FIX_TYPE struct _ppc_fix_extra
104 #define TC_INIT_FIX_DATA(FIXP) \
105   do { (FIXP)->tc_fix_data.ppc_cpu = ppc_cpu; } while (0)
106 
107 #ifdef TE_PE
108 
109 /* Question marks are permitted in symbol names.  */
110 #define LEX_QM 1
111 
112 /* Don't adjust TOC relocs.  */
113 #define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
114 extern int ppc_pe_fix_adjustable (struct fix *);
115 
116 #endif
117 
118 #ifdef OBJ_XCOFF
119 
120 /* Declarations needed when generating XCOFF code.  XCOFF is an
121    extension of COFF, used only on the RS/6000.  Rather than create an
122    obj-xcoff, we just use obj-coff, and handle the extensions here in
123    tc-ppc.  */
124 
125 /* We need to keep some information for symbols.  */
126 struct ppc_tc_sy
127 {
128   /* We keep a few linked lists of symbols.  */
129   symbolS *next;
130   /* The real name, if the symbol was renamed.  */
131   char *real_name;
132   /* Non-zero if the symbol should be output.  The RS/6000 assembler
133      only outputs symbols that are external or are mentioned in a
134      .globl or .lglobl statement.  */
135   unsigned char output;
136   /* The symbol class.  */
137   short symbol_class;
138   /* For a csect or common symbol, the alignment to use.  */
139   unsigned char align;
140   /* For a csect symbol, the subsegment we are using.  This is zero
141      for symbols that are not csects.  */
142   subsegT subseg;
143   /* For a csect symbol, the last symbol which has been defined in
144      this csect, or NULL if none have been defined so far.
145      For a .bs symbol, the referenced csect symbol.
146      For a label, the enclosing csect.  */
147   symbolS *within;
148   union
149   {
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 dwarf symbol, the corresponding dwarf subsection.  */
154     struct dw_subsection *dw;
155   } u;
156 };
157 
158 #define TC_SYMFIELD_TYPE struct ppc_tc_sy
159 
160 /* We need an additional auxent for function symbols.  */
161 #define OBJ_COFF_MAX_AUXENTRIES 2
162 
163 /* Square and curly brackets are permitted in symbol names.  */
164 #define LEX_BR 3
165 
166 /* Canonicalize the symbol name.  */
167 #define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
168 extern char *ppc_canonicalize_symbol_name (char *);
169 
170 /* Get the symbol class from the name.  */
171 #define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
172 extern void ppc_symbol_new_hook (symbolS *);
173 
174 /* Set the symbol class of a label based on the csect.  */
175 #define tc_frob_label(sym) ppc_frob_label (sym)
176 extern void ppc_frob_label (symbolS *);
177 
178 /* TOC relocs requires special handling.  */
179 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
180 extern int ppc_fix_adjustable (struct fix *);
181 
182 /* We need to set the section VMA.  */
183 #define tc_frob_section(sec) ppc_frob_section (sec)
184 extern void ppc_frob_section (asection *);
185 
186 /* Finish up the symbol.  */
187 #define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
188 extern int ppc_frob_symbol (symbolS *);
189 
190 /* Finish up the entire symtab.  */
191 #define tc_adjust_symtab() ppc_adjust_symtab ()
192 extern void ppc_adjust_symtab (void);
193 
194 /* We also need to copy, in particular, the class of the symbol,
195    over what obj-coff would otherwise have copied.  */
196 #define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src)			\
197 do {								\
198   if (SF_GET_GET_SEGMENT (dest))				\
199     S_SET_SEGMENT (dest, S_GET_SEGMENT (src));			\
200   symbol_get_tc (dest)->u = symbol_get_tc (src)->u;		\
201   symbol_get_tc (dest)->align = symbol_get_tc (src)->align;	\
202   symbol_get_tc (dest)->symbol_class = symbol_get_tc (src)->symbol_class;	\
203   symbol_get_tc (dest)->within = symbol_get_tc (src)->within;	\
204 } while (0)
205 
206 extern void ppc_xcoff_end (void);
207 #define md_end ppc_xcoff_end
208 
209 #define tc_new_dot_label(sym) ppc_new_dot_label (sym)
210 extern void ppc_new_dot_label (symbolS *);
211 
212 #endif /* OBJ_XCOFF */
213 
214 extern const char       ppc_symbol_chars[];
215 #define tc_symbol_chars ppc_symbol_chars
216 
217 #ifdef OBJ_ELF
218 
219 /* Support for SHT_ORDERED */
220 extern int ppc_section_type (char *, size_t);
221 extern int ppc_section_flags (flagword, bfd_vma, int);
222 
223 #define md_elf_section_type(STR, LEN)		ppc_section_type (STR, LEN)
224 #define md_elf_section_flags(FLAGS, ATTR, TYPE)	ppc_section_flags (FLAGS, ATTR, TYPE)
225 
226 #define tc_comment_chars ppc_comment_chars
227 extern const char *ppc_comment_chars;
228 
229 /* Keep relocations relative to the GOT, or non-PC relative.  */
230 #define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
231 extern int ppc_fix_adjustable (struct fix *);
232 
233 /* Values passed to md_apply_fix don't include symbol values.  */
234 #define MD_APPLY_SYM_VALUE(FIX) 0
235 
236 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
237   ppc_elf_parse_cons (EXP, NBYTES)
238 extern bfd_reloc_code_real_type ppc_elf_parse_cons (expressionS *,
239 						    unsigned int);
240 #define TC_CONS_FIX_CHECK(EXP, NBYTES, FIX) \
241   ppc_elf_cons_fix_check (EXP, NBYTES, FIX)
242 extern void ppc_elf_cons_fix_check (expressionS *, unsigned int, struct fix *);
243 
244 #define tc_frob_file_before_adjust ppc_frob_file_before_adjust
245 extern void ppc_frob_file_before_adjust (void);
246 
247 #define tc_adjust_symtab() ppc_elf_adjust_symtab ()
248 extern void ppc_elf_adjust_symtab (void);
249 
250 extern void ppc_elf_end (void);
251 #define md_end ppc_elf_end
252 
253 #endif /* OBJ_ELF */
254 
255 #if defined (OBJ_ELF) || defined (OBJ_XCOFF)
256 #define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
257 extern int ppc_force_relocation (struct fix *);
258 #endif
259 
260 /* call md_pcrel_from_section, not md_pcrel_from */
261 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
262 extern long md_pcrel_from_section (struct fix *, segT);
263 
264 #define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
265 extern int ppc_parse_name (const char *, struct expressionS *);
266 
267 #define md_operand(x)
268 
269 #define md_cleanup() ppc_cleanup ()
270 extern void ppc_cleanup (void);
271 
272 #if (defined TE_AIX5 || defined TE_AIX					\
273      || defined TE_FreeBSD || defined TE_NetBSD || defined TE_LYNX)
274 /* ppc uses different register numbers between .eh_frame and .debug_frame.
275    This macro translates the .eh_frame register numbers to .debug_frame
276    register numbers.  */
277 #define md_reg_eh_frame_to_debug_frame(regno)				\
278   ((regno) == 70 ? 64	/* cr2 */					\
279    : (regno) == 65 ? 108 /* lr */					\
280    : (regno) == 66 ? 109 /* ctr */					\
281    : (regno) >= 68 && (regno) <= 75 ? (regno) + 86 - 68 /* crN */	\
282    : (regno) == 76 ? 101 /* xer */					\
283    : (regno) >= 77 && (regno) <= 108 ? (regno) + 1124 - 77 /* vrN */	\
284    : (regno) == 109 ? 356 /* vrsave */					\
285    : (regno) == 110 ? 67 /* vscr */					\
286    : (regno) == 111 ? 99 /* spe_acc */					\
287    : (regno) == 112 ? 612 /* spefscr */					\
288    : (regno))
289 #endif
290 
291 #define TARGET_USE_CFIPOP 1
292 
293 #define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
294 extern void ppc_cfi_frame_initial_instructions (void);
295 
296 #define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
297 extern int tc_ppc_regname_to_dw2regnum (char *);
298 
299 extern int ppc_cie_data_alignment;
300 
301 extern int ppc_dwarf2_line_min_insn_length;
302 
303 #define DWARF2_LINE_MIN_INSN_LENGTH     ppc_dwarf2_line_min_insn_length
304 #define DWARF2_DEFAULT_RETURN_COLUMN    0x41
305 #define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment
306