1 /* Definitions for TI C6X assembler.
2 Copyright (C) 2010-2023 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 #define TC_TIC6X 1
22 #define TARGET_BYTES_BIG_ENDIAN 0
23 #define WORKING_DOT_WORD
24 #define DOUBLEBAR_PARALLEL
25 #define DWARF2_LINE_MIN_INSN_LENGTH 2
26 #define MD_APPLY_SYM_VALUE(FIX) 0
27 #define TC_PREDICATE_START_CHAR '['
28 #define TC_PREDICATE_END_CHAR ']'
29 /* For TI C6X, we keep spaces in what the preprocessor considers
30 operands as they may separate functional unit specifiers from
31 operands. */
32 #define TC_KEEP_OPERAND_SPACES 1
33
34 #define TARGET_ARCH bfd_arch_tic6x
35 #define TARGET_FORMAT (target_big_endian \
36 ? "elf32-tic6x-be" \
37 : "elf32-tic6x-le")
38
39 typedef struct tic6x_label_list
40 {
41 struct tic6x_label_list *next;
42 symbolS *label;
43 } tic6x_label_list;
44
45 /* Must be consistent with the enum in tc-tic6x.c. */
46 #define TIC6X_NUM_UNWIND_REGS 13
47
48 /* Unwinding information state. */
49 typedef struct tic6x_unwind_info {
50 int personality_index;
51 symbolS *personality_routine;
52 symbolS *function_start;
53 segT saved_seg;
54 subsegT saved_subseg;
55 /* NULL if table entry is inline. */
56 symbolS *table_entry;
57 char *frag_start;
58 valueT data;
59 /* 0 before .cfi_startproc
60 -1 between .cfi_startproc and .handlerdata
61 >0 between .handlerdata and .endp */
62 int data_bytes;
63
64 offsetT reg_offset[TIC6X_NUM_UNWIND_REGS];
65 bool reg_saved[TIC6X_NUM_UNWIND_REGS];
66 int cfa_reg;
67 int return_reg;
68 unsigned safe_mask;
69 unsigned compact_mask;
70 unsigned reg_saved_mask;
71 offsetT cfa_offset;
72 bool pop_rts;
73 /* Only valid for UNWIND_OP_POP_REG */
74 int saved_reg_count;
75 } tic6x_unwind_info;
76
77 typedef struct
78 {
79 /* Any labels seen since the last instruction or data. If not NULL,
80 a following instruction may not have parallel bars, but must
81 start a new execute packet. */
82 tic6x_label_list *label_list;
83
84 /* Whether compact instructions are forbidden here. */
85 bool nocmp;
86
87 /* If there is a current execute packet, the frag being used for
88 that execute packet. */
89 fragS *execute_packet_frag;
90
91 /* If there is a current execute packet, a pointer to the
92 least-significant byte of the last instruction in it (for setting
93 the p-bit). */
94 char *last_insn_lsb;
95
96 /* If there has been an SPMASK instruction in the current execute
97 packet, a pointer to the first byte in it (for processing
98 ||^); otherwise NULL. */
99 char *spmask_addr;
100
101 /* The functional units used in the current execute packet, recorded
102 by setting the same bits as would be set in the 32-bit SPMASK
103 instruction. */
104 unsigned int func_units_used;
105
106 /* If an SPLOOP-family instruction has been seen, and a following
107 SPKERNEL-family instruction has not yet been seen, the ii value
108 from the SPLOOP instruction (in the range 1 to 14); otherwise
109 0. */
110 int sploop_ii;
111
112 /* Bit N indicates that an R_C6000_NONE relocation has been output for
113 __c6xabi_unwind_cpp_prN already if set. This enables dependencies to be
114 emitted only once per section, to save unnecessary bloat. */
115 unsigned int marked_pr_dependency;
116
117 tic6x_unwind_info *unwind;
118 tic6x_unwind_info *text_unwind;
119 } tic6x_segment_info_type;
120 #define TC_SEGMENT_INFO_TYPE tic6x_segment_info_type
121
122 typedef struct
123 {
124 /* Whether this machine-dependent frag is used for instructions (as
125 opposed to code alignment). */
126 bool is_insns;
127
128 /* For a frag used for instructions, whether it is may cross a fetch
129 packet boundary (subject to alignment requirements). */
130 bool can_cross_fp_boundary;
131 } tic6x_frag_info;
132 #define TC_FRAG_TYPE tic6x_frag_info
133 #define TC_FRAG_INIT(fragP, max_bytes) tic6x_frag_init (fragP)
134 extern void tic6x_frag_init (fragS *fragp);
135
136 typedef struct
137 {
138 /* Whether this fix was for an ADDA instruction. If so, a constant
139 resulting from resolving the fix should be implicitly shifted
140 left (it represents a value to be encoded literally in the
141 instruction, whereas a non-constant represents a DP-relative
142 value counting in the appropriate units). */
143 bool fix_adda;
144 /* The symbol to be subtracted in case of a PCR_H16 or PCR_L16
145 reloc. */
146 symbolS *fix_subsy;
147 } tic6x_fix_info;
148 #define TC_FIX_TYPE tic6x_fix_info
149 #define TC_INIT_FIX_DATA(fixP) tic6x_init_fix_data (fixP)
150 struct fix;
151 extern void tic6x_init_fix_data (struct fix *fixP);
152
153 #define md_after_parse_args() tic6x_after_parse_args ()
154 extern void tic6x_after_parse_args (void);
155
156 #define md_cleanup() tic6x_cleanup ()
157 extern void tic6x_cleanup (void);
158
159 #define md_cons_align(n) tic6x_cons_align (n)
160 extern void tic6x_cons_align (int n);
161
162 #define md_do_align(n, fill, len, max, label) \
163 do { \
164 if (tic6x_do_align (n, fill, len, max)) \
165 goto label; \
166 } while (0)
167 extern bool tic6x_do_align (int n, char *fill, int len, int max);
168
169 #define CONVERT_SYMBOLIC_ATTRIBUTE(name) \
170 tic6x_convert_symbolic_attribute (name)
171 extern int tic6x_convert_symbolic_attribute (const char *);
172
173 #define md_finish() tic6x_md_finish ();
174 extern void tic6x_md_finish (void);
175
176 #define md_parse_name(name, exprP, mode, nextcharP) \
177 tic6x_parse_name (name, exprP, mode, nextcharP)
178 extern int tic6x_parse_name (const char *name, expressionS *exprP,
179 enum expr_mode mode, char *nextchar);
180
181 #define MD_PCREL_FROM_SECTION(FIX, SEC) tic6x_pcrel_from_section (FIX, SEC)
182 extern long tic6x_pcrel_from_section (struct fix *fixp, segT sec);
183
184 #define md_start_line_hook() tic6x_start_line_hook ()
185 extern void tic6x_start_line_hook (void);
186
187 #define TC_CONS_FIX_NEW(frag, where, size, exp, reloc) \
188 tic6x_cons_fix_new (frag, where, size, exp, reloc)
189 extern void tic6x_cons_fix_new (fragS *, int, int, expressionS *,
190 bfd_reloc_code_real_type);
191
192 #define tc_fix_adjustable(FIX) tic6x_fix_adjustable (FIX)
193 extern bool tic6x_fix_adjustable (struct fix *);
194
195 #define tc_frob_label(sym) tic6x_frob_label (sym)
196 extern void tic6x_frob_label (symbolS *sym);
197
198 #define tc_init_after_args() tic6x_init_after_args ()
199 extern void tic6x_init_after_args (void);
200
201 #define tc_unrecognized_line(c) tic6x_unrecognized_line (c)
202 extern int tic6x_unrecognized_line (int c);
203
204 /* We want .cfi_* pseudo-ops for generating unwind info. */
205 #define TARGET_USE_CFIPOP 1
206
207 /* CFI hooks. */
208 #define tc_regname_to_dw2regnum tic6x_regname_to_dw2regnum
209 int tic6x_regname_to_dw2regnum (char *regname);
210
211 #define tc_cfi_frame_initial_instructions tic6x_frame_initial_instructions
212 void tic6x_frame_initial_instructions (void);
213
214 /* The return register is B3. */
215 #define DWARF2_DEFAULT_RETURN_COLUMN (16 + 3)
216
217 /* Registers are generally saved at negative offsets to the CFA. */
218 #define DWARF2_CIE_DATA_ALIGNMENT (-4)
219
220 #define tc_cfi_startproc tic6x_cfi_startproc
221 void tic6x_cfi_startproc (void);
222
223 #define tc_cfi_endproc tic6x_cfi_endproc
224 struct fde_entry;
225 void tic6x_cfi_endproc (struct fde_entry *fde);
226
227 #define tc_cfi_section_name ".c6xabi.exidx"