1/* tc-ppc.h -- Header file for tc-ppc.c.
2   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
3   2004, 2005 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, 51 Franklin Street - Fifth Floor, Boston, MA
21   02110-1301, USA.  */
22
23#define TC_PPC
24
25struct fix;
26
27/* Set the endianness we are using.  Default to big endian.  */
28#ifndef TARGET_BYTES_BIG_ENDIAN
29#define TARGET_BYTES_BIG_ENDIAN 1
30#endif
31
32/* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
33   XCOFF for AIX or PowerMac.  If TE_PE is defined, we are assembling
34   COFF for Windows NT.  */
35
36#ifdef OBJ_COFF
37#ifndef TE_PE
38#define OBJ_XCOFF
39#endif
40#endif
41
42/* The target BFD architecture.  */
43#define TARGET_ARCH (ppc_arch ())
44#define TARGET_MACH (ppc_mach ())
45extern enum bfd_architecture ppc_arch PARAMS ((void));
46extern unsigned long ppc_mach PARAMS ((void));
47
48/* Whether or not the target is big endian */
49extern int target_big_endian;
50
51/* The target BFD format.  */
52#define TARGET_FORMAT (ppc_target_format ())
53extern char *ppc_target_format PARAMS ((void));
54
55/* Permit temporary numeric labels.  */
56#define LOCAL_LABELS_FB 1
57
58/* $ is used to refer to the current location.  */
59#define DOLLAR_DOT
60
61/* Strings do not use backslash escapes under COFF.  */
62#ifdef OBJ_COFF
63#define NO_STRING_ESCAPES
64#endif
65
66#ifdef OBJ_ELF
67#define DIFF_EXPR_OK		/* foo-. gets turned into PC relative relocs */
68#endif
69
70#if TARGET_BYTES_BIG_ENDIAN
71#define PPC_BIG_ENDIAN 1
72#else
73#define PPC_BIG_ENDIAN 0
74#endif
75
76/* We don't need to handle .word strangely.  */
77#define WORKING_DOT_WORD
78
79#define MAX_MEM_FOR_RS_ALIGN_CODE 4
80#define HANDLE_ALIGN(FRAGP)						\
81  if ((FRAGP)->fr_type == rs_align_code) 				\
82    {									\
83      valueT count = ((FRAGP)->fr_next->fr_address			\
84		      - ((FRAGP)->fr_address + (FRAGP)->fr_fix));	\
85      if (count != 0 && (count & 3) == 0)				\
86	{								\
87	  char *dest = (FRAGP)->fr_literal + (FRAGP)->fr_fix;		\
88									\
89	  (FRAGP)->fr_var = 4;						\
90	  if (target_big_endian)					\
91	    {								\
92	      *dest++ = 0x60;						\
93	      *dest++ = 0;						\
94	      *dest++ = 0;						\
95	      *dest++ = 0;						\
96	    }								\
97	  else								\
98	    {								\
99	      *dest++ = 0;						\
100	      *dest++ = 0;						\
101	      *dest++ = 0;						\
102	      *dest++ = 0x60;						\
103	    }								\
104	}								\
105    }
106
107#define md_frag_check(FRAGP) \
108  if ((FRAGP)->has_code							\
109      && (((FRAGP)->fr_address + (FRAGP)->insn_addr) & 3) != 0)		\
110    as_bad_where ((FRAGP)->fr_file, (FRAGP)->fr_line,			\
111		  _("instruction address is not a multiple of 4"));
112
113#ifdef TE_PE
114
115/* Question marks are permitted in symbol names.  */
116#define LEX_QM 1
117
118/* Don't adjust TOC relocs.  */
119#define tc_fix_adjustable(FIX) ppc_pe_fix_adjustable (FIX)
120extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
121
122#endif
123
124#ifdef OBJ_XCOFF
125
126/* Declarations needed when generating XCOFF code.  XCOFF is an
127   extension of COFF, used only on the RS/6000.  Rather than create an
128   obj-xcoff, we just use obj-coff, and handle the extensions here in
129   tc-ppc.  */
130
131/* We need to keep some information for symbols.  */
132struct ppc_tc_sy
133{
134  /* We keep a few linked lists of symbols.  */
135  symbolS *next;
136  /* Non-zero if the symbol should be output.  The RS/6000 assembler
137     only outputs symbols that are external or are mentioned in a
138     .globl or .lglobl statement.  */
139  int output;
140  /* The symbol class.  */
141  int class;
142  /* The real name, if the symbol was renamed.  */
143  char *real_name;
144  /* For a csect symbol, the subsegment we are using.  This is zero
145     for symbols that are not csects.  */
146  subsegT subseg;
147  /* For a csect or common symbol, the alignment to use.  */
148  int align;
149  /* For a function symbol, a symbol whose value is the size.  The
150     field is NULL if there is no size.  */
151  symbolS *size;
152  /* For a csect symbol, the last symbol which has been defined in
153     this csect, or NULL if none have been defined so far.  For a .bs
154     symbol, the referenced csect symbol.  */
155  symbolS *within;
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)
168extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
169
170/* Get the symbol class from the name.  */
171#define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
172extern void ppc_symbol_new_hook PARAMS ((symbolS *));
173
174/* Set the symbol class of a label based on the csect.  */
175#define tc_frob_label(sym) ppc_frob_label (sym)
176extern void ppc_frob_label PARAMS ((symbolS *));
177
178/* TOC relocs requires special handling.  */
179#define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
180extern int ppc_fix_adjustable PARAMS ((struct fix *));
181
182/* We need to set the section VMA.  */
183#define tc_frob_section(sec) ppc_frob_section (sec)
184extern void ppc_frob_section PARAMS ((asection *));
185
186/* Finish up the symbol.  */
187#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
188extern int ppc_frob_symbol PARAMS ((symbolS *));
189
190/* Finish up the entire symtab.  */
191#define tc_adjust_symtab() ppc_adjust_symtab ()
192extern void ppc_adjust_symtab PARAMS ((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)			\
197do {								\
198  if (SF_GET_GET_SEGMENT (dest))				\
199    S_SET_SEGMENT (dest, S_GET_SEGMENT (src));			\
200  symbol_get_tc (dest)->size = symbol_get_tc (src)->size;	\
201  symbol_get_tc (dest)->align = symbol_get_tc (src)->align;	\
202  symbol_get_tc (dest)->class = symbol_get_tc (src)->class;	\
203  symbol_get_tc (dest)->within = symbol_get_tc (src)->within;	\
204} while (0)
205
206#endif /* OBJ_XCOFF */
207
208extern const char       ppc_symbol_chars[];
209#define tc_symbol_chars ppc_symbol_chars
210
211#ifdef OBJ_ELF
212
213/* Support for SHF_EXCLUDE and SHT_ORDERED */
214extern int ppc_section_letter PARAMS ((int, char **));
215extern int ppc_section_type PARAMS ((char *, size_t));
216extern int ppc_section_word PARAMS ((char *, size_t));
217extern int ppc_section_flags PARAMS ((int, int, int));
218
219#define md_elf_section_letter(LETTER, PTR_MSG)	ppc_section_letter (LETTER, PTR_MSG)
220#define md_elf_section_type(STR, LEN)		ppc_section_type (STR, LEN)
221#define md_elf_section_word(STR, LEN)		ppc_section_word (STR, LEN)
222#define md_elf_section_flags(FLAGS, ATTR, TYPE)	ppc_section_flags (FLAGS, ATTR, TYPE)
223
224#define tc_comment_chars ppc_comment_chars
225extern const char *ppc_comment_chars;
226
227/* Keep relocations relative to the GOT, or non-PC relative.  */
228#define tc_fix_adjustable(FIX) ppc_fix_adjustable (FIX)
229extern int ppc_fix_adjustable PARAMS ((struct fix *));
230
231/* Values passed to md_apply_fix don't include symbol values.  */
232#define MD_APPLY_SYM_VALUE(FIX) 0
233
234#define tc_frob_file_before_adjust ppc_frob_file_before_adjust
235extern void ppc_frob_file_before_adjust PARAMS ((void));
236
237#endif /* OBJ_ELF */
238
239#if defined (OBJ_ELF) || defined (OBJ_XCOFF)
240#define TC_FORCE_RELOCATION(FIX) ppc_force_relocation (FIX)
241extern int ppc_force_relocation PARAMS ((struct fix *));
242#endif
243
244/* call md_pcrel_from_section, not md_pcrel_from */
245#define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section(FIX, SEC)
246extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
247
248#define md_parse_name(name, exp, mode, c) ppc_parse_name (name, exp)
249extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
250
251#define md_operand(x)
252
253#define md_cleanup() ppc_cleanup ()
254 extern void ppc_cleanup PARAMS ((void));
255
256#define TARGET_USE_CFIPOP 1
257
258#define tc_cfi_frame_initial_instructions ppc_cfi_frame_initial_instructions
259extern void ppc_cfi_frame_initial_instructions PARAMS ((void));
260
261#define tc_regname_to_dw2regnum tc_ppc_regname_to_dw2regnum
262extern int tc_ppc_regname_to_dw2regnum PARAMS ((const char *regname));
263
264extern int ppc_cie_data_alignment;
265
266#define DWARF2_LINE_MIN_INSN_LENGTH     4
267#define DWARF2_DEFAULT_RETURN_COLUMN    0x41
268#define DWARF2_CIE_DATA_ALIGNMENT       ppc_cie_data_alignment
269