tc-mips.h revision 179404 
1/* tc-mips.h -- header file for tc-mips.c.
2   Copyright 1993, 1994, 1995, 1996, 1997, 2000, 2001, 2002, 2003
3   Free Software Foundation, Inc.
4   Contributed by the OSF and Ralph Campbell.
5   Written by Keith Knowles and Ralph Campbell, working independently.
6   Modified for ECOFF support by Ian Lance Taylor of Cygnus Support.
7
8   This file is part of GAS.
9
10   GAS is free software; you can redistribute it and/or modify
11   it under the terms of the GNU General Public License as published by
12   the Free Software Foundation; either version 2, or (at your option)
13   any later version.
14
15   GAS is distributed in the hope that it will be useful,
16   but WITHOUT ANY WARRANTY; without even the implied warranty of
17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18   GNU General Public License for more details.
19
20   You should have received a copy of the GNU General Public License
21   along with GAS; see the file COPYING.  If not, write to the Free
22   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23   02111-1307, USA.  */
24
25#ifndef TC_MIPS
26#define TC_MIPS
27
28struct frag;
29struct expressionS;
30
31/* Default to big endian.  */
32#ifndef TARGET_BYTES_BIG_ENDIAN
33#define TARGET_BYTES_BIG_ENDIAN		1
34#endif
35
36#define TARGET_ARCH bfd_arch_mips
37
38#define WORKING_DOT_WORD	1
39#define OLD_FLOAT_READS
40#define REPEAT_CONS_EXPRESSIONS
41#define RELOC_EXPANSION_POSSIBLE
42#define MAX_RELOC_EXPANSION 3
43#define LOCAL_LABELS_FB 1
44
45/* Maximum symbol offset that can be encoded in a BFD_RELOC_GPREL16
46   relocation.  */
47#define MAX_GPREL_OFFSET (0x7FF0)
48
49#define md_relax_frag(segment, fragp, stretch) \
50  mips_relax_frag(segment, fragp, stretch)
51extern int mips_relax_frag (asection *, struct frag *, long);
52
53#define md_undefined_symbol(name)	(0)
54#define md_operand(x)
55
56extern void mips_handle_align (struct frag *);
57#define HANDLE_ALIGN(fragp)  mips_handle_align (fragp)
58
59#define MAX_MEM_FOR_RS_ALIGN_CODE  (1 + 2)
60
61/* We permit PC relative difference expressions when generating
62   embedded PIC code.  */
63#define DIFF_EXPR_OK
64
65/* Tell assembler that we have an itbl_mips.h header file to include.  */
66#define HAVE_ITBL_CPU
67
68/* The endianness of the target format may change based on command
69   line arguments.  */
70#define TARGET_FORMAT mips_target_format()
71extern const char *mips_target_format (void);
72
73/* MIPS PIC level.  */
74
75enum mips_pic_level
76{
77  /* Do not generate PIC code.  */
78  NO_PIC,
79
80  /* Generate PIC code as in the SVR4 MIPS ABI.  */
81  SVR4_PIC,
82
83  /* Generate PIC code without using a global offset table: the data
84     segment has a maximum size of 64K, all data references are off
85     the $gp register, and all text references are PC relative.  This
86     is used on some embedded systems.  */
87  EMBEDDED_PIC
88};
89
90extern enum mips_pic_level mips_pic;
91
92struct mips_cl_insn
93{
94  unsigned long insn_opcode;
95  const struct mips_opcode *insn_mo;
96  /* The next two fields are used when generating mips16 code.  */
97  bfd_boolean use_extend;
98  unsigned short extend;
99};
100
101extern int tc_get_register (int frame);
102
103#define md_after_parse_args() mips_after_parse_args()
104extern void mips_after_parse_args (void);
105
106#define tc_init_after_args() mips_init_after_args()
107extern void mips_init_after_args (void);
108
109#define md_parse_long_option(arg) mips_parse_long_option (arg)
110extern int mips_parse_long_option (const char *);
111
112#define tc_frob_label(sym) mips_define_label (sym)
113extern void mips_define_label (symbolS *);
114
115#define tc_frob_file_before_adjust() mips_frob_file_before_adjust ()
116extern void mips_frob_file_before_adjust (void);
117
118#define tc_frob_file_before_fix() mips_frob_file ()
119extern void mips_frob_file (void);
120
121#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
122#define tc_frob_file_after_relocs mips_frob_file_after_relocs
123extern void mips_frob_file_after_relocs (void);
124#endif
125
126#define tc_fix_adjustable(fixp) mips_fix_adjustable (fixp)
127extern int mips_fix_adjustable (struct fix *);
128
129/* Values passed to md_apply_fix3 don't include symbol values.  */
130#define MD_APPLY_SYM_VALUE(FIX) 0
131
132/* Global syms must not be resolved, to support ELF shared libraries.
133   When generating embedded code, we don't have shared libs.  */
134#define EXTERN_FORCE_RELOC			\
135  (OUTPUT_FLAVOR == bfd_target_elf_flavour	\
136   && mips_pic != EMBEDDED_PIC)
137
138/* When generating embedded PIC code we must keep PC relative
139   relocations.  */
140#define TC_FORCE_RELOCATION(FIX) mips_force_relocation (FIX)
141extern int mips_force_relocation (struct fix *);
142
143#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
144  (! SEG_NORMAL (SEG) || mips_force_relocation (FIX))
145
146/* We use this to turn branches to global symbols into branches to
147   local symbols, so that they can be simplified.  */
148#define TC_VALIDATE_FIX(fixp, this_segment, skip_label) \
149  do \
150    if (! mips_validate_fix ((fixp), (this_segment))) \
151      goto skip_label; \
152  while (0)
153extern int mips_validate_fix (struct fix *, asection *);
154
155/* Register mask variables.  These are set by the MIPS assembly code
156   and used by ECOFF and possibly other object file formats.  */
157extern unsigned long mips_gprmask;
158extern unsigned long mips_cprmask[4];
159
160#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
161
162#define elf_tc_final_processing mips_elf_final_processing
163extern void mips_elf_final_processing (void);
164
165#endif
166
167extern void md_mips_end (void);
168#define md_end()	md_mips_end()
169
170#define USE_GLOBAL_POINTER_OPT	(OUTPUT_FLAVOR == bfd_target_ecoff_flavour \
171				 || OUTPUT_FLAVOR == bfd_target_coff_flavour \
172				 || OUTPUT_FLAVOR == bfd_target_elf_flavour)
173
174extern void mips_pop_insert (void);
175#define md_pop_insert()		mips_pop_insert()
176
177extern void mips_flush_pending_output (void);
178#define md_flush_pending_output mips_flush_pending_output
179
180extern void mips_enable_auto_align (void);
181#define md_elf_section_change_hook()	mips_enable_auto_align()
182
183extern enum dwarf2_format mips_dwarf2_format (void);
184#define DWARF2_FORMAT() mips_dwarf2_format ()
185
186#define DWARF2_ADDR_SIZE(bfd) mips_dwarf2_addr_size ()
187
188#endif /* TC_MIPS */
189