1 /* tc-arc.h - Macros and type defines for the ARC.
2 Copyright (C) 2014-2023 Free Software Foundation, Inc.
3
4 Contributed by Claudiu Zissulescu (claziss@synopsys.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
10 published by the Free Software Foundation; either version 3,
11 or (at your option) any later version.
12
13 GAS is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 the 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, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #ifndef TC_ARC
24 /* By convention, you should define this macro in the `.h' file. For
25 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this
26 if it is necessary to add CPU specific code to the object format
27 file. */
28 #define TC_ARC
29
30 #include "opcode/arc.h"
31
32 /* We want local label support. */
33 #define LOCAL_LABELS_FB 1
34
35 /* This macro is the BFD architecture to pass to
36 `bfd_set_arch_mach'. */
37 #define TARGET_ARCH bfd_arch_arc
38
39 /* The `extsym - .' expressions can be emitted using PC-relative
40 relocs. */
41 #define DIFF_EXPR_OK
42
43 #define REGISTER_PREFIX '%'
44
45 #undef LITTLE_ENDIAN
46 #define LITTLE_ENDIAN 1234
47
48 #undef BIG_ENDIAN
49 #define BIG_ENDIAN 4321
50
51 #ifdef TARGET_BYTES_BIG_ENDIAN
52
53 # define DEFAULT_TARGET_FORMAT "elf32-bigarc"
54 # define DEFAULT_BYTE_ORDER BIG_ENDIAN
55
56 #else
57 /* You should define this macro to be non-zero if the target is big
58 endian, and zero if the target is little endian. */
59 # define TARGET_BYTES_BIG_ENDIAN 0
60
61 # define DEFAULT_TARGET_FORMAT "elf32-littlearc"
62 # define DEFAULT_BYTE_ORDER LITTLE_ENDIAN
63
64 #endif /* TARGET_BYTES_BIG_ENDIAN. */
65
66 /* The endianness of the target format may change based on command
67 line arguments. */
68 extern const char *arc_target_format;
69
70 /* This macro is the BFD target name to use when creating the output
71 file. This will normally depend upon the `OBJ_FMT' macro. */
72 #define TARGET_FORMAT arc_target_format
73
74 /* `md_short_jump_size'
75 `md_long_jump_size'
76 `md_create_short_jump'
77 `md_create_long_jump'
78
79 If `WORKING_DOT_WORD' is defined, GAS will not do broken word
80 processing (*note Broken words::.). Otherwise, you should set
81 `md_short_jump_size' to the size of a short jump (a jump that is
82 just long enough to jump around a long jmp) and `md_long_jump_size'
83 to the size of a long jump (a jump that can go anywhere in the
84 function). You should define `md_create_short_jump' to create a
85 short jump around a long jump, and define `md_create_long_jump' to
86 create a long jump. */
87 #define WORKING_DOT_WORD
88
89 #define LISTING_HEADER "ARC GAS "
90
91 /* The number of bytes to put into a word in a listing. This affects
92 the way the bytes are clumped together in the listing. For
93 example, a value of 2 might print `1234 5678' where a value of 1
94 would print `12 34 56 78'. The default value is 4. */
95 #define LISTING_WORD_SIZE 2
96
97 /* If you define this macro, it should return the position from which
98 the PC relative adjustment for a PC relative fixup should be made.
99 On many processors, the base of a PC relative instruction is the
100 next instruction, so this macro would return the length of an
101 instruction, plus the address of the PC relative fixup. The latter
102 can be calculated as fixp->fx_where +
103 fixp->fx_frag->fr_address. */
104 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
105
106 /* [ ] is index operator. */
107 #define NEED_INDEX_OPERATOR
108
109 #define MAX_MEM_FOR_RS_ALIGN_CODE (1+2)
110
111 /* HANDLE_ALIGN called after all the assembly has been done,
112 so we can fill in all the rs_align_code type frags with
113 nop instructions. */
114 #define HANDLE_ALIGN(FRAGP) arc_handle_align (FRAGP)
115
116 /* Values passed to md_apply_fix3 don't include the symbol value. */
117 #define MD_APPLY_SYM_VALUE(FIX) 0
118
119 /* No shared lib support, so we don't need to ensure externally
120 visible symbols can be overridden. */
121 #define EXTERN_FORCE_RELOC 0
122
123 /* You may define this macro to generate a fixup for a data allocation
124 pseudo-op. */
125 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC) \
126 arc_cons_fix_new ((FRAG), (OFF), (LEN), (EXP), (RELOC))
127
128 /* We don't want gas to fixup the following program memory related
129 relocations. Check also that fx_addsy is not NULL, in order to
130 make sure that the fixup refers to some sort of label. */
131 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \
132 if ((FIXP->fx_r_type == BFD_RELOC_ARC_GOTPC32 \
133 || FIXP->fx_r_type == BFD_RELOC_ARC_PLT32 \
134 || FIXP->fx_r_type == BFD_RELOC_ARC_S25W_PCREL_PLT \
135 || FIXP->fx_r_type == BFD_RELOC_ARC_S25H_PCREL_PLT \
136 || FIXP->fx_r_type == BFD_RELOC_ARC_S21W_PCREL_PLT \
137 || FIXP->fx_r_type == BFD_RELOC_ARC_S21H_PCREL_PLT) \
138 && FIXP->fx_addsy != NULL \
139 && FIXP->fx_subsy == NULL) \
140 { \
141 symbol_mark_used_in_reloc (FIXP->fx_addsy); \
142 goto SKIP; \
143 }
144
145 /* BFD_RELOC_ARC_TLS_GD_LD may use fx_subsy to store a label that is
146 later turned into fx_offset. */
147 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
148 ((FIX)->fx_r_type == BFD_RELOC_ARC_TLS_GD_LD)
149
150 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
151 ((md_register_arithmetic || (SEG) != reg_section) \
152 && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
153 || (FIX)->fx_r_type == BFD_RELOC_GPREL16 \
154 || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF \
155 || (FIX)->fx_r_type == BFD_RELOC_ARC_TLS_DTPOFF_S9 \
156 || TC_FORCE_RELOCATION_SUB_LOCAL (FIX, SEG)))
157
158 /* We use this to mark the end-loop label. We use this mark for ZOL
159 validity checks. */
160 #define TC_SYMFIELD_TYPE unsigned int
161 #define ARC_GET_FLAG(s) (*symbol_get_tc (s))
162 #define ARC_SET_FLAG(s,v) (*symbol_get_tc (s) |= (v))
163
164 /* The symbol is a ZOL's end loop label. */
165 #define ARC_FLAG_ZOL (1 << 0)
166 /* The symbol is an AUX register. */
167 #define ARC_FLAG_AUX (1 << 1)
168
169 /* We use this hook to check the validity of the last to instructions
170 of a ZOL. */
171 #define tc_frob_label(S) arc_frob_label (S)
172
173 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
174
175 /* We need to take care of not having section relative fixups for the
176 fixups with respect to Position Independent Code. */
177 #define tc_fix_adjustable(FIX) tc_arc_fix_adjustable(FIX)
178
179 /* This hook is required to parse register names as operands. */
180 #define md_parse_name(name, exp, m, c) arc_parse_name (name, exp)
181
182 /* Used within frags to pass some information to some relaxation
183 machine dependent values. */
184 #define TC_FRAG_TYPE struct arc_relax_type
185
186 /* Adjust non PC-rel values at relaxation time. */
187 #define TC_PCREL_ADJUST(F) arc_pcrel_adjust (F)
188
189 /* Adjust symbol table. */
190 #define obj_adjust_symtab() arc_adjust_symtab ()
191
192 /* Object attribute hooks. */
193 #define md_finish arc_md_finish
194 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) arc_convert_symbolic_attribute (name)
195 #ifndef TC_COPY_SYMBOL_ATTRIBUTES
196 #define TC_COPY_SYMBOL_ATTRIBUTES(DEST, SRC) \
197 (arc_copy_symbol_attributes (DEST, SRC))
198 #endif
199
200 extern void arc_copy_symbol_attributes (symbolS *, symbolS *);
201 extern int arc_convert_symbolic_attribute (const char *);
202 extern void arc_md_finish (void);
203 extern void arc_adjust_symtab (void);
204 extern int arc_pcrel_adjust (fragS *);
205 extern bool arc_parse_name (const char *, struct expressionS *);
206 extern int tc_arc_fix_adjustable (struct fix *);
207 extern void arc_handle_align (fragS *);
208 extern void arc_cons_fix_new (fragS *, int, int, expressionS *,
209 bfd_reloc_code_real_type);
210 extern void arc_frob_label (symbolS *);
211 extern void tc_arc_frame_initial_instructions (void);
212 extern int tc_arc_regname_to_dw2regnum (char *regname);
213
214 /* The blink register is r31. */
215 #define DWARF2_DEFAULT_RETURN_COLUMN 31
216 /* Registers are generally saved at negative offsets to the CFA. */
217 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
218
219 /* We want .cfi_* pseudo-ops for generating unwind info. */
220 #define TARGET_USE_CFIPOP 1
221
222 /* CFI hooks. */
223 #define tc_cfi_frame_initial_instructions tc_arc_frame_initial_instructions
224 #define tc_regname_to_dw2regnum tc_arc_regname_to_dw2regnum
225
226 /* Define the NOPs. */
227 #define NOP_OPCODE_S 0x000078E0
228 #define NOP_OPCODE_L 0x264A7000 /* mov 0,0. */
229
230 #define MAX_FLAG_NAME_LENGTH 7
231
232 struct arc_flags
233 {
234 /* Name of the parsed flag. */
235 char name[MAX_FLAG_NAME_LENGTH + 1];
236
237 /* Pointer to arc flags. */
238 const struct arc_flag_operand *flgp;
239 };
240
241 extern const relax_typeS md_relax_table[];
242 #define TC_GENERIC_RELAX_TABLE md_relax_table
243
244 /* Used to construct instructions at md_convert_frag stage of
245 relaxation. */
246 struct arc_relax_type
247 {
248 /* Dictates whether the pc-relativity should be kept in mind when
249 relax_frag is called or whether the pc-relativity should be
250 solved outside of relaxation. For clarification: BL(_S) and
251 B(_S) use pcrel == 1 and ADD with a solvable expression as 3rd
252 operand use pcrel == 0. */
253 unsigned char pcrel;
254
255 /* Expressions that dictate the operands. Used for re-assembling in
256 md_convert_frag. */
257 expressionS tok[MAX_INSN_ARGS];
258
259 /* Number of tok (i.e. number of operands). Used for re-assembling
260 in md_convert_frag. */
261 int ntok;
262
263 /* Flags of instruction. Used for re-assembling in
264 md_convert_frag. */
265 struct arc_flags pflags[MAX_INSN_FLGS];
266
267 /* Number of flags. Used for re-assembling in md_convert_frag. */
268 int nflg;
269 };
270
271 extern void arc_md_end (void);
272 #define md_end arc_md_end
273
274 #endif