1 /* Definitions for TI C6X assembler.
2    Copyright (C) 2010-2016 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     bfd_boolean 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     bfd_boolean 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   bfd_boolean 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   bfd_boolean 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   bfd_boolean can_cross_fp_boundary;
131 } tic6x_frag_info;
132 #define TC_FRAG_TYPE tic6x_frag_info
133 #define TC_FRAG_INIT(fragP) 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   bfd_boolean 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 bfd_boolean 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_end() tic6x_end ();
174 extern void tic6x_end (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 bfd_boolean 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"
228