• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* tc-hppa.h -- Header file for the PA
2    Copyright (C) 1989-2014 Free Software Foundation, Inc.
3 
4    This file is part of GAS, the GNU Assembler.
5 
6    GAS is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 3, or (at your option)
9    any later version.
10 
11    GAS is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with GAS; see the file COPYING.  If not, write to the Free
18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19    02110-1301, USA.  */
20 
21 /* HP PA-RISC support was contributed by the Center for Software Science
22    at the University of Utah.  */
23 
24 /* Please refrain from exposing the world to the internals of tc-hppa.c
25    when this file is included.  This means only declaring exported functions,
26    (please PARAMize them!) not exporting structures and data items which
27    are used solely within tc-hppa.c, etc.
28 
29    Also refrain from adding any more object file dependent code, there is
30    already far too much object file format dependent code in this file.
31    In theory this file should contain only exported functions, structures
32    and data declarations common to all PA assemblers.  */
33 
34 #ifndef _TC_HPPA_H
35 #define _TC_HPPA_H
36 
37 #ifndef TC_HPPA
38 #define TC_HPPA	1
39 #endif
40 
41 #define TARGET_BYTES_BIG_ENDIAN 1
42 
43 #define TARGET_ARCH bfd_arch_hppa
44 
45 #define WORKING_DOT_WORD
46 
47 #ifdef OBJ_ELF
48 #if TARGET_ARCH_SIZE == 64
49 #include "bfd/elf64-hppa.h"
50 #if defined (TE_LINUX) || defined (TE_NetBSD)
51 #define TARGET_FORMAT "elf64-hppa-linux"
52 #else
53 #define TARGET_FORMAT "elf64-hppa"
54 #endif
55 #else /* TARGET_ARCH_SIZE == 32 */
56 #include "bfd/elf32-hppa.h"
57 #if defined (TE_LINUX)
58 #define TARGET_FORMAT "elf32-hppa-linux"
59 #else
60 #if defined (TE_NetBSD)
61 #define TARGET_FORMAT "elf32-hppa-netbsd"
62 #else
63 #define TARGET_FORMAT "elf32-hppa"
64 #endif
65 #endif
66 #endif
67 #endif
68 
69 #ifdef OBJ_SOM
70 #include "bfd/som.h"
71 #define TARGET_FORMAT "som"
72 #endif
73 
74 #if defined(TE_LINUX) || defined(TE_NetBSD)
75 /* Define to compile in an extra assembler option, -c, which enables a
76    warning (once per file) when a comment is encountered.
77    The hppa comment char is a `;' which tends to occur in random C asm
78    statements.  A semicolon is a line separator for most assemblers.
79    It's hard to find these lurking semicolons.  Thus...  */
80 #define WARN_COMMENTS 1
81 #endif
82 
83 /* FIXME.  Why oh why aren't these defined somewhere globally?  */
84 #ifndef FALSE
85 #define FALSE   (0)
86 #define TRUE    (!FALSE)
87 #endif
88 
89 #define ASEC_NULL (asection *)0
90 
91 /* pa_define_label gets used outside of tc-hppa.c via tc_frob_label.  */
92 extern void pa_define_label (symbolS *);
93 extern int parse_cons_expression_hppa (expressionS *);
94 extern void cons_fix_new_hppa (fragS *, int, int, expressionS *, int);
95 extern int hppa_force_relocation (struct fix *);
96 
97 /* This gets called before writing the object file to make sure
98    things like entry/exit and proc/procend pairs match.  */
99 extern void pa_check_eof (void);
100 #define tc_frob_file pa_check_eof
101 
102 #define tc_frob_label(sym) pa_define_label (sym)
103 
104 extern const char	hppa_symbol_chars[];
105 #define tc_symbol_chars	hppa_symbol_chars
106 
107 #define RELOC_EXPANSION_POSSIBLE
108 #define MAX_RELOC_EXPANSION 6
109 
110 /* The PA needs to parse field selectors in .byte, etc.  */
111 
112 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
113   parse_cons_expression_hppa (EXP)
114 #define TC_CONS_FIX_NEW cons_fix_new_hppa
115 #define TC_PARSE_CONS_RETURN_TYPE int
116 #define TC_PARSE_CONS_RETURN_NONE e_fsel
117 
118 /* On the PA, an exclamation point can appear in an instruction.  It is
119    used in FP comparison instructions and as an end of line marker.
120    When used in an instruction it will always follow a comma.  */
121 #define TC_EOL_IN_INSN(PTR)	(*(PTR) == '!' && (PTR)[-1] == ',')
122 
123 int hppa_fix_adjustable (struct fix *);
124 #define tc_fix_adjustable hppa_fix_adjustable
125 
126 #define EXTERN_FORCE_RELOC 1
127 
128 /* Because of the strange PA calling conventions, it is sometimes
129    necessary to emit a relocation for a call even though it would
130    normally appear safe to handle it completely within GAS.  */
131 #define TC_FORCE_RELOCATION(FIX) hppa_force_relocation (FIX)
132 
133 /* Values passed to md_apply_fix don't include the symbol value.  */
134 #define MD_APPLY_SYM_VALUE(FIX) 0
135 
136 #ifdef OBJ_SOM
137 /* If a symbol is imported, but never used, then the symbol should
138    *not* end up in the symbol table.  Likewise for absolute symbols
139    with local scope.  */
140 #define tc_frob_symbol(sym,punt) \
141     if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr && ! symbol_used_p (sym)) \
142 	|| (S_GET_SEGMENT (sym) == bfd_abs_section_ptr \
143 	    && ! S_IS_EXTERNAL (sym))) \
144       punt = 1
145 
146 /* We need to be able to make relocations involving the difference of
147    two symbols.  This includes the difference of two symbols when
148    one of them is undefined (this comes up in PIC code generation).
149 
150    We allow the difference of two symbols when the subtract symbol is
151    local to the relocation.  This is implemented using R_HPPA_COMPLEX.
152 
153    This has some limitations.  Difference expressions only work between
154    symbols in the same segment/quadrant of a module since the HP dynamic
155    loader relocates the text and data segments independently.  Thus, a
156    difference expression can't be used between text and data symbols,
157    or between symbols in different executable modules.  */
158 #define DIFF_EXPR_OK 1
159 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
160 #define UNDEFINED_DIFFERENCE_OK
161 #endif
162 
163 #ifdef OBJ_ELF
164 
165 /* Difference expressions for the 64-bit HP-UX target have the same
166    limitations as those for the 32-bit SOM target.  */
167 #define DIFF_EXPR_OK 1
168 
169 /* Handle .type psuedo.  Given a type string of `millicode', set the
170    internal elf symbol type to STT_PARISC_MILLI, and return
171    BSF_FUNCTION for the BFD symbol type.  */
172 #define md_elf_symbol_type(name, sym, elf)				\
173   ((strcmp ((name), "millicode") == 0					\
174     || strcmp ((name), "STT_PARISC_MILLI") == 0)			\
175    ? (((elf)->internal_elf_sym.st_info = ELF_ST_INFO			\
176        (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), STT_PARISC_MILLI)\
177        ), BSF_FUNCTION)							\
178    : -1)
179 
180 #define tc_frob_symbol(sym,punt) \
181   { \
182     if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr \
183          && ! symbol_used_p (sym) \
184          && ELF_ST_VISIBILITY (S_GET_OTHER (sym)) == STV_DEFAULT) \
185 	|| strcmp (S_GET_NAME (sym), "$global$") == 0 \
186 	|| strcmp (S_GET_NAME (sym), "$segrel$") == 0 \
187 	|| strcmp (S_GET_NAME (sym), "$PIC_pcrel$0") == 0 \
188 	|| strcmp (S_GET_NAME (sym), "$tls_gdidx$") == 0 \
189 	|| strcmp (S_GET_NAME (sym), "$tls_ldidx$") == 0 \
190 	|| strcmp (S_GET_NAME (sym), "$tls_dtpoff$") == 0 \
191 	|| strcmp (S_GET_NAME (sym), "$tls_ieoff$") == 0 \
192 	|| strcmp (S_GET_NAME (sym), "$tls_leoff$") == 0) \
193       punt = 1; \
194   }
195 
196 #define elf_tc_final_processing	elf_hppa_final_processing
197 void elf_hppa_final_processing (void);
198 #endif /* OBJ_ELF */
199 
200 #define md_operand(x)
201 
202 /* Allow register expressions to be treated as absolute expressions.
203    A silly fudge required for backwards compatibility.  */
204 #define md_optimize_expr hppa_force_reg_syms_absolute
205 
206 int hppa_force_reg_syms_absolute (expressionS *, operatorT, expressionS *);
207 
208 #define TC_FIX_TYPE void *
209 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = NULL)
210 
211 #ifdef OBJ_ELF
212 #define TARGET_USE_CFIPOP 1
213 
214 #define tc_cfi_frame_initial_instructions hppa_cfi_frame_initial_instructions
215 extern void hppa_cfi_frame_initial_instructions (void);
216 
217 #define tc_regname_to_dw2regnum hppa_regname_to_dw2regnum
218 extern int hppa_regname_to_dw2regnum (char *regname);
219 
220 #define DWARF2_LINE_MIN_INSN_LENGTH 4
221 #define DWARF2_DEFAULT_RETURN_COLUMN 2
222 #if TARGET_ARCH_SIZE == 64
223 #define DWARF2_CIE_DATA_ALIGNMENT 8
224 #define DWARF2_FDE_RELOC_SIZE 8
225 #else
226 #define DWARF2_CIE_DATA_ALIGNMENT 4
227 #endif
228 
229 #if !defined (TE_LINUX) && !defined (TE_NetBSD)
230 /* Due to the way dynamic linking to personality functions is handled
231    on HP-UX, we need to have a read-write .eh_frame section.  */
232 #define DWARF2_EH_FRAME_READ_ONLY 0
233 
234 /* Because differences between text and data symbols don't work, we
235    can't use difference expressions during CFI generation.  */
236 #define CFI_DIFF_EXPR_OK 0
237 #endif
238 
239 #endif /* OBJ_ELF */
240 #endif /* _TC_HPPA_H */
241