tc-ia64.h revision 84865 
1/* tc-ia64.h -- Header file for tc-ia64.c.
2   Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
3   Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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
19   the Free Software Foundation, 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include <opcode/ia64.h>
23#include <elf/ia64.h>
24
25#define TC_IA64
26
27/* Linux is little endian by default.  HPUX is big endian by default.  */
28#ifdef TE_HPUX
29#define md_number_to_chars		number_to_chars_bigendian
30#define TARGET_BYTES_BIG_ENDIAN		1
31#else
32#define md_number_to_chars		number_to_chars_littleendian
33#define TARGET_BYTES_BIG_ENDIAN		0
34#endif /* TE_HPUX */
35
36/* We need to set the default object file format in ia64_init and not in
37   md_begin.  This is because parse_args is called before md_begin, and we
38   do not want md_begin to wipe out the flag settings set by options parsed in
39   md_parse_args.  */
40
41#define HOST_SPECIAL_INIT ia64_init
42extern void ia64_init PARAMS ((int, char **));
43
44#define TARGET_FORMAT ia64_target_format()
45extern const char *ia64_target_format PARAMS ((void));
46
47#define TARGET_ARCH			bfd_arch_ia64
48#define DOUBLESLASH_LINE_COMMENTS	/* allow //-style comments */
49#define TC_HANDLES_FX_DONE
50
51#define NEED_LITERAL_POOL		/* need gp literal pool */
52#define RELOC_REQUIRES_SYMBOL
53#define DIFF_EXPR_OK   /* foo-. gets turned into PC relative relocs */
54#define NEED_INDEX_OPERATOR		/* [ ] is index operator */
55
56#define QUOTES_IN_INSN			/* allow `string "foo;bar"' */
57#define LEX_AT		LEX_NAME	/* allow `@' inside name */
58#define LEX_QM		LEX_NAME	/* allow `?' inside name */
59#define LEX_HASH	LEX_END_NAME	/* allow `#' ending a name */
60
61struct ia64_fix
62  {
63    int bigendian;			/* byte order at fix location */
64    enum ia64_opnd opnd;
65  };
66
67extern void ia64_do_align PARAMS((int n));
68extern void ia64_end_of_source PARAMS((void));
69extern void ia64_start_line PARAMS((void));
70extern int ia64_unrecognized_line PARAMS((int ch));
71extern void ia64_frob_label PARAMS((struct symbol *sym));
72extern void ia64_flush_pending_output PARAMS((void));
73extern int ia64_parse_name (char *name, expressionS *e);
74extern int ia64_optimize_expr PARAMS((expressionS *l, operatorT op,
75				      expressionS *r));
76extern void ia64_cons_align PARAMS((int));
77extern void ia64_flush_insns PARAMS((void));
78extern int ia64_fix_adjustable PARAMS((struct fix *fix));
79extern int ia64_force_relocation PARAMS((struct fix *));
80extern void ia64_cons_fix_new PARAMS ((fragS *f, int where, int nbytes,
81				       expressionS *exp));
82extern void ia64_validate_fix PARAMS ((struct fix *fix));
83extern char * ia64_canonicalize_symbol_name PARAMS ((char *));
84extern flagword ia64_elf_section_flags PARAMS ((flagword, int, int));
85extern int ia64_elf_section_type PARAMS ((const char *, size_t len));
86extern long ia64_pcrel_from_section PARAMS ((struct fix *fix, segT sec));
87extern void ia64_md_do_align PARAMS ((int, const char *, int, int));
88extern void ia64_handle_align PARAMS ((fragS *f));
89
90#define md_end()       			ia64_end_of_source ()
91#define md_start_line_hook()		ia64_start_line ()
92#define tc_unrecognized_line(ch)	ia64_unrecognized_line (ch)
93#define tc_frob_label(s)		ia64_frob_label (s)
94#define md_flush_pending_output()	ia64_flush_pending_output ()
95#define md_parse_name(s,e)		ia64_parse_name (s, e)
96#define tc_canonicalize_symbol_name(s)	ia64_canonicalize_symbol_name (s)
97#define md_optimize_expr(l,o,r)		ia64_optimize_expr (l, o, r)
98#define md_cons_align(n)		ia64_cons_align (n)
99#define TC_FORCE_RELOCATION(f)		ia64_force_relocation (f)
100#define tc_fix_adjustable(f)		ia64_fix_adjustable (f)
101#define md_convert_frag(b,s,f)		as_fatal ("ia64_convert_frag")
102#define md_create_long_jump(p,f,t,fr,s)	as_fatal("ia64_create_long_jump")
103#define md_create_short_jump(p,f,t,fr,s) \
104					as_fatal("ia64_create_short_jump")
105#define md_estimate_size_before_relax(f,s) \
106			(as_fatal ("ia64_estimate_size_before_relax"), 1)
107#define md_elf_section_flags		ia64_elf_section_flags
108#define TC_FIX_TYPE			struct ia64_fix
109#define TC_INIT_FIX_DATA(f)		{ f->tc_fix_data.opnd = 0; }
110#define TC_CONS_FIX_NEW(f,o,l,e)	ia64_cons_fix_new (f, o, l, e)
111#define TC_VALIDATE_FIX(fix,seg,skip)	ia64_validate_fix (fix)
112#define MD_PCREL_FROM_SECTION(fix,sec)	ia64_pcrel_from_section (fix, sec)
113#define md_do_align(n,f,l,m,j)		ia64_md_do_align (n,f,l,m)
114#define HANDLE_ALIGN(f)			ia64_handle_align (f)
115#define md_elf_section_type(str,len)	ia64_elf_section_type (str, len)
116
117#define MAX_MEM_FOR_RS_ALIGN_CODE  (15 + 16)
118
119/* Call md_apply_fix3 with segment instead of md_apply_fix.  */
120#define MD_APPLY_FIX3
121
122#define WORKING_DOT_WORD	/* don't do broken word processing for now */
123
124#define ELF_TC_SPECIAL_SECTIONS						   \
125{ ".sbss",	SHT_NOBITS,	SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT }, \
126{ ".sdata",	SHT_PROGBITS,	SHF_ALLOC + SHF_WRITE + SHF_IA_64_SHORT },
127
128#define DWARF2_LINE_MIN_INSN_LENGTH 1	/* so slot-multipliers can be 1 */
129
130/* This is the information required for unwind records in an ia64
131   object file. This is required by GAS and the compiler runtime.  */
132
133/* These are the starting point masks for the various types of
134   unwind records. To create a record of type R3 for instance, one
135   starts by using the value UNW_R3 and or-ing in any other required values.
136   These values are also unique (in context), so they can be used to identify
137   the various record types as well. UNW_Bx and some UNW_Px do have the
138   same value, but Px can only occur in a prologue context, and Bx in
139   a body context.  */
140
141#define UNW_R1	0x00
142#define UNW_R2	0x40
143#define UNW_R3	0x60
144#define UNW_P1	0x80
145#define UNW_P2	0xA0
146#define UNW_P3	0xB0
147#define UNW_P4	0xB8
148#define UNW_P5	0xB9
149#define UNW_P6	0xC0
150#define UNW_P7	0xE0
151#define UNW_P8	0xF0
152#define UNW_P9	0xF1
153#define UNW_P10	0xFF
154#define UNW_X1	0xF9
155#define UNW_X2	0xFA
156#define UNW_X3	0xFB
157#define UNW_X4	0xFC
158#define UNW_B1	0x80
159#define UNW_B2	0xC0
160#define UNW_B3	0xE0
161#define UNW_B4	0xF0
162
163/* These are all the various types of unwind records.  */
164
165typedef enum
166{
167  prologue, prologue_gr, body, mem_stack_f, mem_stack_v, psp_gr, psp_sprel,
168  rp_when, rp_gr, rp_br, rp_psprel, rp_sprel, pfs_when, pfs_gr, pfs_psprel,
169  pfs_sprel, preds_when, preds_gr, preds_psprel, preds_sprel,
170  fr_mem, frgr_mem, gr_gr, gr_mem, br_mem, br_gr, spill_base, spill_mask,
171  unat_when, unat_gr, unat_psprel, unat_sprel, lc_when, lc_gr, lc_psprel,
172  lc_sprel, fpsr_when, fpsr_gr, fpsr_psprel, fpsr_sprel,
173  priunat_when_gr, priunat_when_mem, priunat_gr, priunat_psprel,
174  priunat_sprel, bsp_when, bsp_gr, bsp_psprel, bsp_sprel, bspstore_when,
175  bspstore_gr, bspstore_psprel, bspstore_sprel, rnat_when, rnat_gr,
176  rnat_psprel, rnat_sprel, epilogue, label_state, copy_state,
177  spill_psprel, spill_sprel, spill_reg, spill_psprel_p, spill_sprel_p,
178  spill_reg_p, unwabi
179} unw_record_type;
180
181/* These structures declare the fields that can be used in each of the
182   4 record formats, R, P, B and X.  */
183
184typedef struct unw_r_record
185{
186  unsigned long rlen;
187  unsigned short grmask;
188  unsigned short grsave;
189  /* masks to represent the union of save.g, save.f, save.b, and
190     save.gf: */
191  unsigned long imask_size;
192  struct
193  {
194    unsigned char *i;
195    unsigned long fr_mem;
196    unsigned char gr_mem;
197    unsigned char br_mem;
198  } mask;
199} unw_r_record;
200
201typedef struct unw_p_record
202{
203  void *imask;
204  unsigned long t;
205  unsigned long size;
206  unsigned long spoff;
207  unsigned long br;
208  unsigned long pspoff;
209  unsigned short gr;
210  unsigned short rmask;
211  unsigned short grmask;
212  unsigned long frmask;
213  unsigned short brmask;
214  unsigned char abi;
215  unsigned char context;
216} unw_p_record;
217
218typedef struct unw_b_record
219{
220  unsigned long t;
221  unsigned long label;
222  unsigned short ecount;
223} unw_b_record;
224
225typedef struct unw_x_record
226{
227  unsigned long t;
228  unsigned long spoff;
229  unsigned long pspoff;
230  unsigned short reg;
231  unsigned short treg;
232  unsigned short qp;
233  unsigned short ab;	/* Value of the AB field..  */
234  unsigned short xy;	/* Value of the XY field..  */
235} unw_x_record;
236
237/* This structure is used to determine the specific record type and
238   its fields.  */
239typedef struct unwind_record
240{
241  unw_record_type type;
242  union {
243    unw_r_record r;
244    unw_p_record p;
245    unw_b_record b;
246    unw_x_record x;
247  } record;
248} unwind_record;
249
250/* This expression evaluates to false if the relocation is for a local
251   object for which we still want to do the relocation at runtime.
252   True if we are willing to perform this relocation while building
253   the .o file.  This is only used for pcrel relocations.  */
254
255#define TC_RELOC_RTSYM_LOC_FIXUP(FIX)				\
256  ((FIX)->fx_addsy == NULL					\
257   || (FIX)->fx_r_type == 0					\
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