1 /* tc-hppa.h -- Header file for the PA
2 Copyright (C) 1989-2023 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 #define ASEC_NULL (asection *)0
84
85 /* pa_define_label gets used outside of tc-hppa.c via tc_frob_label. */
86 extern void pa_define_label (symbolS *);
87 extern int parse_cons_expression_hppa (expressionS *);
88 extern void cons_fix_new_hppa (fragS *, int, int, expressionS *, int);
89 extern int hppa_force_relocation (struct fix *);
90
91 /* This gets called before writing the object file to make sure
92 things like entry/exit and proc/procend pairs match. */
93 extern void pa_check_eof (void);
94 #define tc_frob_file pa_check_eof
95
96 #define tc_frob_label(sym) pa_define_label (sym)
97
98 extern const char hppa_symbol_chars[];
99 #define tc_symbol_chars hppa_symbol_chars
100
101 #define RELOC_EXPANSION_POSSIBLE
102 #define MAX_RELOC_EXPANSION 6
103
104 /* The PA needs to parse field selectors in .byte, etc. */
105
106 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
107 parse_cons_expression_hppa (EXP)
108 #define TC_CONS_FIX_NEW cons_fix_new_hppa
109 #define TC_PARSE_CONS_RETURN_TYPE int
110 #define TC_PARSE_CONS_RETURN_NONE e_fsel
111
112 /* On the PA, an exclamation point can appear in an instruction. It is
113 used in FP comparison instructions and as an end of line marker.
114 When used in an instruction it will always follow a comma. */
115 #define TC_EOL_IN_INSN(PTR) (*(PTR) == '!' && (PTR)[-1] == ',')
116
117 int hppa_fix_adjustable (struct fix *);
118 #define tc_fix_adjustable hppa_fix_adjustable
119
120 #define EXTERN_FORCE_RELOC 1
121
122 /* Because of the strange PA calling conventions, it is sometimes
123 necessary to emit a relocation for a call even though it would
124 normally appear safe to handle it completely within GAS. */
125 #define TC_FORCE_RELOCATION(FIX) hppa_force_relocation (FIX)
126
127 /* Values passed to md_apply_fix don't include the symbol value. */
128 #define MD_APPLY_SYM_VALUE(FIX) 0
129
130 /* The PA needs this for PIC code generation. */
131 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
132 (md_register_arithmetic || (SEG) != reg_section)
133
134 #ifdef OBJ_SOM
135 /* If a symbol is imported, but never used, then the symbol should
136 *not* end up in the symbol table. Likewise for absolute symbols
137 with local scope. */
138 #define tc_frob_symbol(sym,punt) \
139 if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr && ! symbol_used_p (sym)) \
140 || (S_GET_SEGMENT (sym) == bfd_abs_section_ptr \
141 && ! S_IS_EXTERNAL (sym))) \
142 punt = 1
143
144 /* We need to be able to make relocations involving the difference of
145 two symbols. This includes the difference of two symbols when
146 one of them is undefined (this comes up in PIC code generation).
147
148 We allow the difference of two symbols when the subtract symbol is
149 local to the relocation. This is implemented using R_HPPA_COMPLEX.
150
151 This has some limitations. Difference expressions only work between
152 symbols in the same segment/quadrant of a module since the HP dynamic
153 loader relocates the text and data segments independently. Thus, a
154 difference expression can't be used between text and data symbols,
155 or between symbols in different executable modules. */
156 #define DIFF_EXPR_OK 1
157 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
158 #define UNDEFINED_DIFFERENCE_OK
159 #endif
160
161 #ifdef OBJ_ELF
162
163 /* Difference expressions for the 64-bit HP-UX target have the same
164 limitations as those for the 32-bit SOM target. */
165 #define DIFF_EXPR_OK 1
166
167 /* Handle .type pseudo. Given a type string of `millicode', set the
168 internal elf symbol type to STT_PARISC_MILLI, and return
169 BSF_FUNCTION for the BFD symbol type. */
170 #define md_elf_symbol_type(name, sym, elf) \
171 ((strcmp ((name), "millicode") == 0 \
172 || strcmp ((name), "STT_PARISC_MILLI") == 0) \
173 ? (((elf)->internal_elf_sym.st_info = ELF_ST_INFO \
174 (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), STT_PARISC_MILLI)\
175 ), BSF_FUNCTION) \
176 : -1)
177
178 /* Handle type change from .type pseudo: Zap STT_PARISC_MILLI when
179 switching to a non-function type. */
180 #define md_elf_symbol_type_change(sym, elf, type) \
181 ((type) != BSF_FUNCTION \
182 && (((elf)->internal_elf_sym.st_info = \
183 ELF_ST_INFO (ELF_ST_BIND ((elf)->internal_elf_sym.st_info), \
184 STT_NOTYPE)), 0))
185
186 #define tc_frob_symbol(sym,punt) \
187 { \
188 if ((S_GET_SEGMENT (sym) == bfd_und_section_ptr \
189 && ! symbol_used_p (sym) \
190 && ELF_ST_VISIBILITY (S_GET_OTHER (sym)) == STV_DEFAULT) \
191 || strcmp (S_GET_NAME (sym), "$global$") == 0 \
192 || strcmp (S_GET_NAME (sym), "$segrel$") == 0 \
193 || strcmp (S_GET_NAME (sym), "$PIC_pcrel$0") == 0 \
194 || strcmp (S_GET_NAME (sym), "$tls_gdidx$") == 0 \
195 || strcmp (S_GET_NAME (sym), "$tls_ldidx$") == 0 \
196 || strcmp (S_GET_NAME (sym), "$tls_dtpoff$") == 0 \
197 || strcmp (S_GET_NAME (sym), "$tls_ieoff$") == 0 \
198 || strcmp (S_GET_NAME (sym), "$tls_leoff$") == 0) \
199 punt = 1; \
200 }
201
202 #define elf_tc_final_processing elf_hppa_final_processing
203 void elf_hppa_final_processing (void);
204 #endif /* OBJ_ELF */
205
206 #define md_operand(x)
207
208 /* Allow register expressions to be treated as absolute expressions.
209 A silly fudge required for backwards compatibility. */
210 #define md_optimize_expr hppa_force_reg_syms_absolute
211
212 int hppa_force_reg_syms_absolute (expressionS *, operatorT, expressionS *);
213
214 #define TC_FIX_TYPE void *
215 #define TC_INIT_FIX_DATA(FIX) ((FIX)->tc_fix_data = NULL)
216
217 #ifdef OBJ_ELF
218 #define TARGET_USE_CFIPOP 1
219
220 #define tc_cfi_frame_initial_instructions hppa_cfi_frame_initial_instructions
221 extern void hppa_cfi_frame_initial_instructions (void);
222
223 #define tc_regname_to_dw2regnum hppa_regname_to_dw2regnum
224 extern int hppa_regname_to_dw2regnum (char *regname);
225
226 #define DWARF2_LINE_MIN_INSN_LENGTH 4
227 #define DWARF2_DEFAULT_RETURN_COLUMN 2
228 #if TARGET_ARCH_SIZE == 64
229 #define DWARF2_CIE_DATA_ALIGNMENT 8
230 #define DWARF2_FDE_RELOC_SIZE 8
231 #else
232 #define DWARF2_CIE_DATA_ALIGNMENT 4
233 #endif
234
235 #if !defined (TE_LINUX) && !defined (TE_NetBSD)
236 /* Due to the way dynamic linking to personality functions is handled
237 on HP-UX, we need to have a read-write .eh_frame section. */
238 #define DWARF2_EH_FRAME_READ_ONLY 0
239
240 /* Because differences between text and data symbols don't work, we
241 can't use difference expressions during CFI generation. */
242 #define CFI_DIFF_EXPR_OK 0
243 #endif
244
245 #endif /* OBJ_ELF */
246 #endif /* _TC_HPPA_H */