1 /* This file is tc-sh.h
2 Copyright (C) 1993-2023 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
18 the Free Software Foundation, 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
20
21 #define TC_SH
22
23 #define TARGET_ARCH bfd_arch_sh
24
25 /* The type fixS is defined (to struct fix) in write.h, but write.h uses
26 definitions from this file. To avoid problems with including write.h
27 after the "right" definitions, don't; just forward-declare struct fix
28 here. */
29 struct fix;
30 struct segment_info_struct;
31 struct internal_reloc;
32
33 /* Whether -relax was used. */
34 extern int sh_relax;
35
36 /* Whether -small was used. */
37 extern int sh_small;
38
39 /* Don't try to break words. */
40 #define WORKING_DOT_WORD
41
42 /* We require .long, et. al., to be aligned correctly. */
43 #define md_cons_align(nbytes) sh_cons_align (nbytes)
44 extern void sh_cons_align (int);
45
46 /* We need to optimize expr with taking account of rs_align_test
47 frags. */
48
49 #ifdef OBJ_ELF
50 #define md_optimize_expr(l,o,r) sh_optimize_expr (l, o, r)
51 extern int sh_optimize_expr (expressionS *, operatorT, expressionS *);
52 #endif
53
54 /* When relaxing, we need to generate relocations for alignment
55 directives. */
56 #define HANDLE_ALIGN(frag) sh_handle_align (frag)
57 extern void sh_handle_align (fragS *);
58
59 #define MAX_MEM_FOR_RS_ALIGN_CODE (1 + 2)
60
61 /* We need to force out some relocations when relaxing. */
62 #define TC_FORCE_RELOCATION(fix) sh_force_relocation (fix)
63 extern int sh_force_relocation (struct fix *);
64
65 /* This macro decides whether a particular reloc is an entry in a
66 switch table. It is used when relaxing, because the linker needs
67 to know about all such entries so that it can adjust them if
68 necessary. */
69
70 #define SWITCH_TABLE(FIX) \
71 ((FIX)->fx_addsy != NULL \
72 && (FIX)->fx_subsy != NULL \
73 && S_GET_SEGMENT ((FIX)->fx_addsy) == text_section \
74 && S_GET_SEGMENT ((FIX)->fx_subsy) == text_section \
75 && ((FIX)->fx_r_type == BFD_RELOC_32 \
76 || (FIX)->fx_r_type == BFD_RELOC_16 \
77 || (FIX)->fx_r_type == BFD_RELOC_8))
78
79 #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC) \
80 (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC) \
81 || TC_FORCE_RELOCATION (FIX) \
82 || (sh_relax && SWITCH_TABLE (FIX)))
83
84 /* Don't complain when we leave fx_subsy around. */
85 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
86 ((md_register_arithmetic || (SEG) != reg_section) \
87 && sh_relax && SWITCH_TABLE (FIX))
88
89 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
90
91 /* SH_COUNT relocs are allowed outside of frag.
92 The target is also buggy and sets fix size too large for other relocs. */
93 #define TC_FX_SIZE_SLACK(FIX) \
94 ((FIX)->fx_r_type == BFD_RELOC_SH_COUNT ? -1 : 2)
95
96 #define IGNORE_NONSTANDARD_ESCAPES
97
98 #define LISTING_HEADER \
99 (!target_big_endian \
100 ? "Renesas / SuperH SH GAS Little Endian" \
101 : "Renesas / SuperH SH GAS Big Endian")
102
103 #define md_operand(x)
104
105 extern const struct relax_type md_relax_table[];
106 #define TC_GENERIC_RELAX_TABLE md_relax_table
107
108 /* We record, for each section, whether we have most recently output a
109 CODE reloc or a DATA reloc. */
110 struct sh_segment_info_type
111 {
112 int in_code : 1;
113 };
114 #define TC_SEGMENT_INFO_TYPE struct sh_segment_info_type
115
116 /* We call a routine to emit a reloc for a label, so that the linker
117 can align loads and stores without crossing a label. */
118 extern void sh_frob_label (symbolS *);
119 #define tc_frob_label(sym) sh_frob_label (sym)
120
121 /* We call a routine to flush pending output in order to output a DATA
122 reloc when required. */
123 extern void sh_flush_pending_output (void);
124 #define md_flush_pending_output() sh_flush_pending_output ()
125
126 #define tc_frob_file_before_adjust sh_frob_file
127 extern void sh_frob_file (void);
128
129
130 #ifdef OBJ_COFF
131 /* COFF specific definitions. */
132
133 #define tc_coff_symbol_emit_hook(a) ; /* Not used. */
134
135 #define TC_KEEP_FX_OFFSET 1
136
137 #define SEG_NAME(SEG) segment_name (SEG)
138
139 /* We align most sections to a 16 byte boundary. */
140 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
141 (startswith (SEG_NAME (SEG), ".stabstr") \
142 ? 0 \
143 : ((startswith (SEG_NAME (SEG), ".stab") \
144 || strcmp (SEG_NAME (SEG), ".ctors") == 0 \
145 || strcmp (SEG_NAME (SEG), ".dtors") == 0) \
146 ? 2 \
147 : (sh_small ? 2 : 4)))
148
149 #endif /* OBJ_COFF */
150
151 #ifdef OBJ_ELF
152 /* ELF specific definitions. */
153
154 /* Whether or not the target is big endian. */
155 extern int target_big_endian;
156 #ifdef TE_LINUX
157 #define TARGET_FORMAT (!target_big_endian ? "elf32-sh-linux" : "elf32-shbig-linux")
158 #elif defined(TE_NetBSD)
159 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-nbsd" : "elf32-sh-nbsd")
160 #elif defined (TE_VXWORKS)
161 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl-vxworks" : "elf32-sh-vxworks")
162 #elif defined (TE_UCLINUX)
163 #define TARGET_FORMAT sh_uclinux_target_format ()
164 extern const char * sh_uclinux_target_format (void);
165 #else
166 #define TARGET_FORMAT (!target_big_endian ? "elf32-shl" : "elf32-sh")
167 #endif
168
169 #define elf_tc_final_processing sh_elf_final_processing
170 extern void sh_elf_final_processing (void);
171
172 #define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs. */
173
174 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
175
176 /* This is the relocation type for direct references to
177 GLOBAL_OFFSET_TABLE. It comes up in complicated expressions such
178 as _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed
179 normally with the regular expressions. The fixup specified here
180 when used at runtime implies that we should add the address of the
181 GOT to the specified location, and as a result we have simplified
182 the expression into something we can use. */
183 #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_SH_GOTPC
184
185 #define tc_fix_adjustable(FIX) sh_fix_adjustable(FIX)
186 extern bool sh_fix_adjustable (struct fix *);
187
188 /* Values passed to md_apply_fix don't include symbol values. */
189 #define MD_APPLY_SYM_VALUE(FIX) 0
190
191 /* This expression evaluates to true if the relocation is for a local object
192 for which we still want to do the relocation at runtime. False if we
193 are willing to perform this relocation while building the .o file.
194
195 We can't resolve references to the GOT or the PLT when creating the
196 object file, since these tables are only created by the linker.
197 Also, if the symbol is global, weak, common or not defined, the
198 assembler can't compute the appropriate reloc, since its location
199 can only be determined at link time. */
200
201 #define TC_FORCE_RELOCATION_LOCAL(FIX) \
202 (GENERIC_FORCE_RELOCATION_LOCAL (FIX) \
203 || (FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL \
204 || (FIX)->fx_r_type == BFD_RELOC_32_GOT_PCREL \
205 || (FIX)->fx_r_type == BFD_RELOC_SH_GOTPC)
206
207 #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
208 ((!md_register_arithmetic && (SEG) == reg_section) \
209 || (sh_relax && SWITCH_TABLE (FIX)))
210
211 /* This keeps the subtracted symbol around, for use by PLT_PCREL
212 relocs. */
213 #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
214 ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL \
215 || (!md_register_arithmetic && (SEG) == reg_section))
216
217 /* Don't complain when we leave fx_subsy around. */
218 #undef TC_VALIDATE_FIX_SUB
219 #define TC_VALIDATE_FIX_SUB(FIX, SEG) \
220 ((md_register_arithmetic || (SEG) != reg_section) \
221 && ((FIX)->fx_r_type == BFD_RELOC_32_PLT_PCREL \
222 || (sh_relax && SWITCH_TABLE (FIX))))
223
224 #define md_parse_name(name, exprP, mode, nextcharP) \
225 sh_parse_name ((name), (exprP), (mode), (nextcharP))
226 int sh_parse_name (char const *, expressionS *,
227 enum expr_mode, char *);
228
229 #define TC_CONS_FIX_NEW(FRAG, OFF, LEN, EXP, RELOC) \
230 sh_cons_fix_new ((FRAG), (OFF), (LEN), (EXP), (RELOC))
231 void sh_cons_fix_new (fragS *, int, int, expressionS *,
232 bfd_reloc_code_real_type);
233
234 /* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
235 symbols. The relocation type is stored in X_md. */
236 #define O_PIC_reloc O_md1
237
238 #define TARGET_USE_CFIPOP 1
239
240 #define tc_cfi_frame_initial_instructions sh_cfi_frame_initial_instructions
241 extern void sh_cfi_frame_initial_instructions (void);
242
243 #define tc_regname_to_dw2regnum sh_regname_to_dw2regnum
244 extern int sh_regname_to_dw2regnum (char *);
245
246 /* All SH instructions are multiples of 16 bits. */
247 #define DWARF2_LINE_MIN_INSN_LENGTH 2
248 #define DWARF2_DEFAULT_RETURN_COLUMN 17
249 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
250
251 #endif /* OBJ_ELF */
252
253 #define H_TICK_HEX 1