tc-alpha.h revision 91041 
1/* This file is tc-alpha.h
2   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3   Free Software Foundation, Inc.
4   Written by Ken Raeburn <raeburn@cygnus.com>.
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
21   02111-1307, USA.  */
22
23#define TC_ALPHA
24
25#define TARGET_BYTES_BIG_ENDIAN 0
26
27#define WORKING_DOT_WORD
28
29#define TARGET_ARCH			bfd_arch_alpha
30
31#define TARGET_FORMAT (OUTPUT_FLAVOR == bfd_target_ecoff_flavour	\
32		       ? "ecoff-littlealpha"				\
33		       : OUTPUT_FLAVOR == bfd_target_elf_flavour	\
34		       ? "elf64-alpha"					\
35		       : OUTPUT_FLAVOR == bfd_target_evax_flavour	\
36		       ? "vms-alpha"					\
37		       : "unknown-format")
38
39#define NEED_LITERAL_POOL
40#define REPEAT_CONS_EXPRESSIONS
41
42extern void alpha_validate_fix PARAMS ((struct fix *));
43extern int alpha_force_relocation PARAMS ((struct fix *));
44extern int alpha_fix_adjustable PARAMS ((struct fix *));
45
46extern unsigned long alpha_gprmask, alpha_fprmask;
47extern valueT alpha_gp_value;
48
49#define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) alpha_validate_fix (FIXP)
50#define TC_FORCE_RELOCATION(FIXP)	alpha_force_relocation (FIXP)
51#define tc_fix_adjustable(FIXP)		alpha_fix_adjustable (FIXP)
52#define RELOC_REQUIRES_SYMBOL
53
54/* This expression evaluates to false if the relocation is for a local
55   object for which we still want to do the relocation at runtime.
56   True if we are willing to perform this relocation while building
57   the .o file.  This is only used for pcrel relocations.  */
58
59#define TC_RELOC_RTSYM_LOC_FIXUP(FIX)				\
60  ((FIX)->fx_addsy == NULL					\
61   || (! S_IS_EXTERNAL ((FIX)->fx_addsy)			\
62       && ! S_IS_WEAK ((FIX)->fx_addsy)				\
63       && S_IS_DEFINED ((FIX)->fx_addsy)			\
64       && ! S_IS_COMMON ((FIX)->fx_addsy)))
65
66#define md_convert_frag(b,s,f)		as_fatal ("alpha convert_frag\n")
67#define md_estimate_size_before_relax(f,s) \
68			(as_fatal ("estimate_size_before_relax called"),1)
69#define md_operand(x)
70
71#ifdef OBJ_EVAX
72
73/* This field keeps the symbols position in the link section.  */
74#define OBJ_SYMFIELD_TYPE valueT
75
76#define TC_CONS_FIX_NEW(FRAG,OFF,LEN,EXP) \
77      fix_new_exp (FRAG, OFF, (int)LEN, EXP, 0, \
78	LEN == 2 ? BFD_RELOC_16 \
79	: LEN == 4 ? BFD_RELOC_32 \
80	: LEN == 8 ? BFD_RELOC_64 \
81	: BFD_RELOC_ALPHA_LINKAGE);
82#endif
83
84#define md_number_to_chars		number_to_chars_littleendian
85
86extern int tc_get_register PARAMS ((int frame));
87extern void alpha_frob_ecoff_data PARAMS ((void));
88
89#define tc_frob_label(sym) alpha_define_label (sym)
90extern void alpha_define_label PARAMS ((symbolS *));
91
92#define md_cons_align(nbytes) alpha_cons_align (nbytes)
93extern void alpha_cons_align PARAMS ((int));
94
95#define HANDLE_ALIGN(fragp) alpha_handle_align (fragp)
96extern void alpha_handle_align PARAMS ((struct frag *));
97
98#define MAX_MEM_FOR_RS_ALIGN_CODE  (3 + 4 + 8)
99
100#ifdef OBJ_ECOFF
101#define tc_frob_file_before_adjust() alpha_frob_file_before_adjust ()
102extern void alpha_frob_file_before_adjust PARAMS ((void));
103#endif
104
105#define DIFF_EXPR_OK   /* foo-. gets turned into PC relative relocs */
106
107#ifdef OBJ_ELF
108#define ELF_TC_SPECIAL_SECTIONS \
109  { ".sdata",   SHT_PROGBITS,   SHF_ALLOC + SHF_WRITE + SHF_ALPHA_GPREL  }, \
110  { ".sbss",    SHT_NOBITS,     SHF_ALLOC + SHF_WRITE + SHF_ALPHA_GPREL  },
111
112#define md_elf_section_letter		alpha_elf_section_letter
113extern int alpha_elf_section_letter PARAMS ((int, char **));
114#define md_elf_section_flags		alpha_elf_section_flags
115extern flagword alpha_elf_section_flags PARAMS ((flagword, int, int));
116#endif
117
118/* Whether to add support for explict !relocation_op!sequence_number.  At the
119   moment, only do this for ELF, though ECOFF could use it as well.  */
120
121#ifdef OBJ_ELF
122#define RELOC_OP_P
123#endif
124
125/* Before the relocations are written, reorder them, so that user
126   supplied !lituse relocations follow the appropriate !literal
127   relocations.  Also convert the gas-internal relocations to the
128   appropriate linker relocations.  */
129#define tc_adjust_symtab() alpha_adjust_symtab ()
130extern void alpha_adjust_symtab PARAMS ((void));
131
132/* New fields for supporting explicit relocations (such as !literal to mark
133   where a pointer is loaded from the global table, and !lituse_base to track
134   all of the normal uses of that pointer).  */
135
136#define TC_FIX_TYPE struct alpha_fix_tag
137
138struct alpha_fix_tag
139{
140  struct fix *next_reloc;		/* next !lituse or !gpdisp */
141  struct alpha_reloc_tag *info;		/* other members with same sequence */
142};
143
144/* Initialize the TC_FIX_TYPE field.  */
145#define TC_INIT_FIX_DATA(fixP)						\
146do {									\
147  fixP->tc_fix_data.next_reloc = (struct fix *)0;			\
148  fixP->tc_fix_data.info = (struct alpha_literal_tag *)0;		\
149} while (0)
150
151/* Work with DEBUG5 to print fields in tc_fix_type.  */
152#define TC_FIX_DATA_PRINT(stream,fixP)					\
153do {									\
154  if (fixP->tc_fix_data.info)						\
155    fprintf (stderr, "\tinfo = 0x%lx, next_reloc = 0x%lx\n", \
156	     (long)fixP->tc_fix_data.info,				\
157	     (long)fixP->tc_fix_data.next_reloc);			\
158} while (0)
159
160#define DWARF2_LINE_MIN_INSN_LENGTH 4
161