1 /* Target Definitions for R8C/M16C/M32C
2 Copyright (C) 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Red Hat.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 3, or (at your
11 option) any later version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 /* Controlling the Compilation Driver, `gcc'. */
28 #define STARTFILE_SPEC "crt0.o%s crtbegin.o%s"
30 /* There are four CPU series we support, but they basically break down
31 into two families - the R8C/M16C families, with 16-bit address
32 registers and one set of opcodes, and the M32CM/M32C group, with
33 24-bit address registers and a different set of opcodes. The
34 assembler doesn't care except for which opcode set is needed; the
35 big difference is in the memory maps, which we cover in
42 %{mcpu=m32cm:--m32c} \
45 /* The default is R8C hardware. We support a simulator, which has its
46 own libgloss and link map, plus one default link map for each chip
47 family. Most of the logic here is making sure we do the right
48 thing when no CPU is specified, which defaults to R8C. */
50 #define LIB_SPEC "-( -lc %{msim*:-lsim}%{!msim*:-lnosys} -) \
51 %{msim*:%{!T*: %{mcpu=m32cm:%Tsim24.ld}%{mcpu=m32c:%Tsim24.ld} \
52 %{!mcpu=m32cm:%{!mcpu=m32c:%Tsim16.ld}}}} \
53 %{!T*:%{!msim*: %{mcpu=m16c:%Tm16c.ld} \
54 %{mcpu=m32cm:%Tm32cm.ld} \
55 %{mcpu=m32c:%Tm32c.ld} \
56 %{!mcpu=m16c:%{!mcpu=m32cm:%{!mcpu=m32c:%Tr8c.ld}}}}} \
59 /* Run-time Target Specification */
61 /* Nothing unusual here. */
62 #define TARGET_CPU_CPP_BUILTINS() \
64 builtin_assert ("cpu=m32c"); \
65 builtin_assert ("machine=m32c"); \
66 builtin_define ("__m32c__=1"); \
68 builtin_define ("__r8c_cpu__=1"); \
70 builtin_define ("__m16c_cpu__=1"); \
72 builtin_define ("__m32cm_cpu__=1"); \
74 builtin_define ("__m32c_cpu__=1"); \
77 /* The pragma handlers need to know if we've started processing
78 functions yet, as the memregs pragma should only be given at the
79 beginning of the file. This variable starts off TRUE and later
81 extern int ok_to_change_target_memregs
;
82 extern int target_memregs
;
84 /* TARGET_CPU is a multi-way option set in m32c.opt. While we could
85 use enums or defines for this, this and m32c.opt are the only
86 places that know (or care) what values are being used. */
87 #define TARGET_R8C (target_cpu == 'r')
88 #define TARGET_M16C (target_cpu == '6')
89 #define TARGET_M32CM (target_cpu == 'm')
90 #define TARGET_M32C (target_cpu == '3')
92 /* Address register sizes. Warning: these are used all over the place
93 to select between the two CPU families in general. */
94 #define TARGET_A16 (TARGET_R8C || TARGET_M16C)
95 #define TARGET_A24 (TARGET_M32CM || TARGET_M32C)
97 #define TARGET_VERSION fprintf (stderr, " (m32c)");
99 /* Defining data structures for per-function information */
101 typedef struct GTY (()) machine_function
103 /* How much we adjust the stack when returning from an exception
107 /* TRUE if the current function is an interrupt handler. */
110 /* TRUE if the current function is a leaf function. Currently, this
111 only affects saving $a0 in interrupt functions. */
114 /* Bitmask that keeps track of which registers are used in an
115 interrupt function, so we know which ones need to be saved and
118 /* Likewise, one element for each memreg that needs to be saved. */
119 char intr_pushmem
[16];
121 /* TRUE if the current function can use a simple RTS to return, instead
122 of the longer ENTER/EXIT pair. */
127 #define INIT_EXPANDERS m32c_init_expanders ()
131 #define BITS_BIG_ENDIAN 0
132 #define BYTES_BIG_ENDIAN 0
133 #define WORDS_BIG_ENDIAN 0
135 /* We can do QI, HI, and SI operations pretty much equally well, but
136 GCC expects us to have a "native" format, so we pick the one that
137 matches "int". Pointers are 16 bits for R8C/M16C (when TARGET_A16
138 is true) and 24 bits for M32CM/M32C (when TARGET_A24 is true), but
139 24-bit pointers are stored in 32-bit words. */
140 #define BITS_PER_UNIT 8
141 #define UNITS_PER_WORD 2
142 #define POINTER_SIZE (TARGET_A16 ? 16 : 32)
143 #define POINTERS_EXTEND_UNSIGNED 1
144 /* We have a problem with libgcc2. It only defines two versions of
145 each function, one for "int" and one for "long long". Ie it assumes
146 that "sizeof (int) == sizeof (long)". For the M32C this is not true
147 and we need a third set of functions. We explicitly define
148 LIBGCC2_UNITS_PER_WORD here so that it is clear that we are expecting
149 to get the SI and DI versions from the libgcc2.c sources, and we
150 provide our own set of HI functions in m32c-lib2.c, which is why this
151 definition is surrounded by #ifndef..#endif. */
152 #ifndef LIBGCC2_UNITS_PER_WORD
153 #define LIBGCC2_UNITS_PER_WORD 4
156 /* These match the alignment enforced by the two types of stack operations. */
157 #define PARM_BOUNDARY (TARGET_A16 ? 8 : 16)
158 #define STACK_BOUNDARY (TARGET_A16 ? 8 : 16)
160 /* We do this because we care more about space than about speed. For
161 the chips with 16-bit busses, we could set these to 16 if
163 #define FUNCTION_BOUNDARY 8
164 #define BIGGEST_ALIGNMENT 8
166 /* Since we have a maximum structure alignment of 8 there
167 is no need to enforce any alignment of bitfield types. */
168 #undef PCC_BITFIELD_TYPE_MATTERS
169 #define PCC_BITFIELD_TYPE_MATTERS 0
171 #define STRICT_ALIGNMENT 0
172 #define SLOW_BYTE_ACCESS 1
174 /* Layout of Source Language Data Types */
176 #define INT_TYPE_SIZE 16
177 #define SHORT_TYPE_SIZE 16
178 #define LONG_TYPE_SIZE 32
179 #define LONG_LONG_TYPE_SIZE 64
181 #define FLOAT_TYPE_SIZE 32
182 #define DOUBLE_TYPE_SIZE 64
183 #define LONG_DOUBLE_TYPE_SIZE 64
185 #define DEFAULT_SIGNED_CHAR 1
188 #define PTRDIFF_TYPE (TARGET_A16 ? "int" : "long int")
191 #define UINTPTR_TYPE (TARGET_A16 ? "unsigned int" : "long unsigned int")
195 /* Register Basics */
199 [r0h][r0l] $r0 (16 bits, or two 8-bit halves)
200 [--------] $r2 (16 bits)
201 [r1h][r1l] $r1 (16 bits, or two 8-bit halves)
202 [--------] $r3 (16 bits)
203 [---][--------] $a0 (might be 24 bits)
204 [---][--------] $a1 (might be 24 bits)
205 [---][--------] $sb (might be 24 bits)
206 [---][--------] $fb (might be 24 bits)
207 [---][--------] $sp (might be 24 bits)
208 [-------------] $pc (20 or 24 bits)
209 [---] $flg (CPU flags)
210 [---][--------] $argp (virtual)
211 [--------] $mem0 (all 16 bits)
216 #define FIRST_PSEUDO_REGISTER 20
218 /* Note that these two tables are modified based on which CPU family
219 you select; see m32c_conditional_register_usage for details. */
221 /* r0 r2 r1 r3 - a0 a1 sb fb - sp pc flg argp - mem0..mem14 */
222 #define FIXED_REGISTERS { 0, 0, 0, 0, \
225 0, 0, 0, 0, 0, 0, 0, 0 }
226 #define CALL_USED_REGISTERS { 1, 1, 1, 1, \
229 1, 1, 1, 1, 1, 1, 1, 1 }
231 #define CONDITIONAL_REGISTER_USAGE m32c_conditional_register_usage ();
233 /* The *_REGNO theme matches m32c.md and most register number
234 arguments; the PC_REGNUM is the odd one out. */
238 #define PC_REGNUM PC_REGNO
240 /* Order of Allocation of Registers */
242 #define REG_ALLOC_ORDER { \
243 0, 1, 2, 3, 4, 5, /* r0..r3, a0, a1 */ \
244 12, 13, 14, 15, 16, 17, 18, 19, /* mem0..mem7 */ \
245 6, 7, 8, 9, 10, 11 /* sb, fb, sp, pc, flg, ap */ }
247 /* How Values Fit in Registers */
249 #define HARD_REGNO_NREGS(R,M) m32c_hard_regno_nregs (R, M)
250 #define HARD_REGNO_MODE_OK(R,M) m32c_hard_regno_ok (R, M)
251 #define MODES_TIEABLE_P(M1,M2) m32c_modes_tieable_p (M1, M2)
252 #define AVOID_CCMODE_COPIES
254 /* Register Classes */
256 /* Most registers are special purpose in some form or another, so this
257 table is pretty big. Class names are used for constraints also;
258 for example the HL_REGS class (HL below) is "Rhl" in the md files.
259 See m32c_reg_class_from_constraint for the mapping. There's some
260 duplication so that we can better isolate the reason for using
261 constraints in the md files from the actual registers used; for
262 example we may want to exclude a1a0 from SI_REGS in the future,
263 without precluding their use as HImode registers. */
265 /* m7654 - m3210 - argp flg pc sp - fb sb a1 a0 - r3 r1 r2 r0 */
267 #define REG_CLASS_CONTENTS \
268 { { 0x00000000 }, /* NO */\
269 { 0x00000100 }, /* SP - sp */\
270 { 0x00000080 }, /* FB - fb */\
271 { 0x00000040 }, /* SB - sb */\
272 { 0x000001c0 }, /* CR - sb fb sp */\
273 { 0x00000001 }, /* R0 - r0 */\
274 { 0x00000004 }, /* R1 - r1 */\
275 { 0x00000002 }, /* R2 - r2 */\
276 { 0x00000008 }, /* R3 - r3 */\
277 { 0x00000003 }, /* R02 - r0r2 */\
278 { 0x0000000c }, /* R13 - r1r3 */\
279 { 0x00000005 }, /* HL - r0 r1 */\
280 { 0x00000005 }, /* QI - r0 r1 */\
281 { 0x0000000a }, /* R23 - r2 r3 */\
282 { 0x0000000f }, /* R03 - r0r2 r1r3 */\
283 { 0x0000000f }, /* DI - r0r2r1r3 + mems */\
284 { 0x00000010 }, /* A0 - a0 */\
285 { 0x00000020 }, /* A1 - a1 */\
286 { 0x00000030 }, /* A - a0 a1 */\
287 { 0x000000f0 }, /* AD - a0 a1 sb fp */\
288 { 0x000001f0 }, /* PS - a0 a1 sb fp sp */\
289 { 0x0000000f }, /* SI - r0r2 r1r3 a0a1 */\
290 { 0x0000003f }, /* HI - r0 r1 r2 r3 a0 a1 */\
291 { 0x00000033 }, /* R02A - r0r2 a0 a1 */ \
292 { 0x0000003f }, /* RA - r0..r3 a0 a1 */\
293 { 0x0000007f }, /* GENERAL */\
294 { 0x00000400 }, /* FLG */\
295 { 0x000001ff }, /* HC - r0l r1 r2 r3 a0 a1 sb fb sp */\
296 { 0x000ff000 }, /* MEM */\
297 { 0x000ff003 }, /* R02_A_MEM */\
298 { 0x000ff005 }, /* A_HL_MEM */\
299 { 0x000ff00c }, /* R1_R3_A_MEM */\
300 { 0x000ff00f }, /* R03_MEM */\
301 { 0x000ff03f }, /* A_HI_MEM */\
302 { 0x000ff0ff }, /* A_AD_CR_MEM_SI */\
303 { 0x000ff1ff }, /* ALL */\
347 #define N_REG_CLASSES LIM_REG_CLASSES
349 #define REG_CLASS_NAMES {\
381 "R1_R3_A_MEM_REGS", \
384 "A_AD_CR_MEM_SI_REGS", \
388 #define REGNO_REG_CLASS(R) m32c_regno_reg_class (R)
390 /* We support simple displacements off address registers, nothing else. */
391 #define BASE_REG_CLASS A_REGS
392 #define INDEX_REG_CLASS NO_REGS
394 /* We primarily use the new "long" constraint names, with the initial
395 letter classifying the constraint type and following letters
396 specifying which. The types are:
400 S - memory references (M was used)
401 A - addresses (currently unused)
404 #define CONSTRAINT_LEN(CHAR,STR) \
406 : (CHAR) == 'R' ? 3 \
407 : (CHAR) == 'S' ? 2 \
408 : (CHAR) == 'A' ? 2 \
409 : DEFAULT_CONSTRAINT_LEN(CHAR,STR))
410 #define REG_CLASS_FROM_CONSTRAINT(CHAR,STR) \
411 m32c_reg_class_from_constraint (CHAR, STR)
413 #define REGNO_OK_FOR_BASE_P(NUM) m32c_regno_ok_for_base_p (NUM)
414 #define REGNO_OK_FOR_INDEX_P(NUM) 0
416 #define PREFERRED_RELOAD_CLASS(X,CLASS) m32c_preferred_reload_class (X, CLASS)
417 #define PREFERRED_OUTPUT_RELOAD_CLASS(X,CLASS) m32c_preferred_output_reload_class (X, CLASS)
418 #define LIMIT_RELOAD_CLASS(MODE,CLASS) m32c_limit_reload_class (MODE, CLASS)
420 #define SECONDARY_RELOAD_CLASS(CLASS,MODE,X) m32c_secondary_reload_class (CLASS, MODE, X)
422 #define TARGET_SMALL_REGISTER_CLASSES_FOR_MODE_P hook_bool_mode_true
424 #define CLASS_MAX_NREGS(C,M) m32c_class_max_nregs (C, M)
426 #define CANNOT_CHANGE_MODE_CLASS(F,T,C) m32c_cannot_change_mode_class(F,T,C)
428 #define CONST_OK_FOR_CONSTRAINT_P(VALUE,C,STR) \
429 m32c_const_ok_for_constraint_p (VALUE, C, STR)
430 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(VALUE,C,STR) 0
431 #define EXTRA_CONSTRAINT_STR(VALUE,C,STR) \
432 m32c_extra_constraint_p (VALUE, C, STR)
433 #define EXTRA_MEMORY_CONSTRAINT(C,STR) \
434 m32c_extra_memory_constraint (C, STR)
435 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) \
436 m32c_extra_address_constraint (C, STR)
438 /* STACK AND CALLING */
442 /* Standard push/pop stack, no surprises here. */
444 #define STACK_GROWS_DOWNWARD 1
445 #define STACK_PUSH_CODE PRE_DEC
446 #define FRAME_GROWS_DOWNWARD 1
448 #define STARTING_FRAME_OFFSET 0
449 #define FIRST_PARM_OFFSET(F) 0
451 #define RETURN_ADDR_RTX(COUNT,FA) m32c_return_addr_rtx (COUNT)
453 #define INCOMING_RETURN_ADDR_RTX m32c_incoming_return_addr_rtx()
454 #define INCOMING_FRAME_SP_OFFSET (TARGET_A24 ? 4 : 3)
456 /* Exception Handling Support */
458 #define EH_RETURN_DATA_REGNO(N) m32c_eh_return_data_regno (N)
459 #define EH_RETURN_STACKADJ_RTX m32c_eh_return_stackadj_rtx ()
461 /* Registers That Address the Stack Frame */
471 #define STACK_POINTER_REGNUM SP_REGNO
472 #define FRAME_POINTER_REGNUM FP_REGNO
473 #define ARG_POINTER_REGNUM AP_REGNO
475 /* The static chain must be pointer-capable. */
476 #define STATIC_CHAIN_REGNUM A0_REGNO
478 #define DWARF_FRAME_REGISTERS 20
479 #define DWARF_FRAME_REGNUM(N) m32c_dwarf_frame_regnum (N)
480 #define DBX_REGISTER_NUMBER(N) m32c_dwarf_frame_regnum (N)
482 #undef ASM_PREFERRED_EH_DATA_FORMAT
483 /* This is the same as the default in practice, except that by making
484 it explicit we tell binutils what size pointers to use. */
485 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
486 (TARGET_A16 ? DW_EH_PE_udata2 : DW_EH_PE_udata4)
488 /* Eliminating Frame Pointer and Arg Pointer */
490 #define ELIMINABLE_REGS \
491 {{AP_REGNO, SP_REGNO}, \
492 {AP_REGNO, FB_REGNO}, \
493 {FB_REGNO, SP_REGNO}}
495 #define INITIAL_ELIMINATION_OFFSET(FROM,TO,VAR) \
496 (VAR) = m32c_initial_elimination_offset(FROM,TO)
498 /* Passing Function Arguments on the Stack */
501 #define PUSH_ROUNDING(N) m32c_push_rounding (N)
502 #define CALL_POPS_ARGS(C) 0
504 /* Passing Arguments in Registers */
506 typedef struct m32c_cumulative_args
508 /* For address of return value buffer (structures are returned by
509 passing the address of a buffer as an invisible first argument.
510 This identifies it). If set, the current parameter will be put
511 on the stack, regardless of type. */
513 /* First parm is 1, parm 0 is hidden pointer for returning
516 } m32c_cumulative_args
;
518 #define CUMULATIVE_ARGS m32c_cumulative_args
519 #define INIT_CUMULATIVE_ARGS(CA,FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS) \
520 m32c_init_cumulative_args (&(CA),FNTYPE,LIBNAME,FNDECL,N_NAMED_ARGS)
521 #define FUNCTION_ARG_BOUNDARY(MODE,TYPE) (TARGET_A16 ? 8 : 16)
522 #define FUNCTION_ARG_REGNO_P(r) m32c_function_arg_regno_p (r)
524 /* How Large Values Are Returned */
526 #define DEFAULT_PCC_STRUCT_RETURN 1
528 /* Function Entry and Exit */
530 #define EXIT_IGNORE_STACK 0
531 #define EPILOGUE_USES(REGNO) m32c_epilogue_uses(REGNO)
532 #define EH_USES(REGNO) 0 /* FIXME */
534 /* Generating Code for Profiling */
536 #define FUNCTION_PROFILER(FILE,LABELNO)
538 /* Implementing the Varargs Macros */
540 /* Trampolines for Nested Functions */
542 #define TRAMPOLINE_SIZE m32c_trampoline_size ()
543 #define TRAMPOLINE_ALIGNMENT m32c_trampoline_alignment ()
545 /* Addressing Modes */
547 #define HAVE_PRE_DECREMENT 1
548 #define HAVE_POST_INCREMENT 1
549 #define MAX_REGS_PER_ADDRESS 1
551 /* This is passed to the macros below, so that they can be implemented
554 #define REG_OK_STRICT_V 1
556 #define REG_OK_STRICT_V 0
559 #define REG_OK_FOR_BASE_P(X) m32c_reg_ok_for_base_p (X, REG_OK_STRICT_V)
560 #define REG_OK_FOR_INDEX_P(X) 0
562 /* #define FIND_BASE_TERM(X) when we do unspecs for symrefs */
564 #define LEGITIMIZE_RELOAD_ADDRESS(X,MODE,OPNUM,TYPE,IND_LEVELS,WIN) \
565 if (m32c_legitimize_reload_address(&(X),MODE,OPNUM,TYPE,IND_LEVELS)) \
568 #define LEGITIMATE_CONSTANT_P(X) m32c_legitimate_constant_p (X)
570 /* Condition Code Status */
572 #define REVERSIBLE_CC_MODE(MODE) 1
574 /* Dividing the Output into Sections (Texts, Data, ...) */
576 #define TEXT_SECTION_ASM_OP ".text"
577 #define DATA_SECTION_ASM_OP ".data"
578 #define BSS_SECTION_ASM_OP ".bss"
580 #define CTOR_LIST_BEGIN
581 #define CTOR_LIST_END
582 #define DTOR_LIST_BEGIN
583 #define DTOR_LIST_END
584 #define CTORS_SECTION_ASM_OP "\t.section\t.init_array,\"aw\",%init_array"
585 #define DTORS_SECTION_ASM_OP "\t.section\t.fini_array,\"aw\",%fini_array"
586 #define INIT_ARRAY_SECTION_ASM_OP "\t.section\t.init_array,\"aw\",%init_array"
587 #define FINI_ARRAY_SECTION_ASM_OP "\t.section\t.fini_array,\"aw\",%fini_array"
589 /* The Overall Framework of an Assembler File */
591 #define ASM_COMMENT_START ";"
592 #define ASM_APP_ON ""
593 #define ASM_APP_OFF ""
595 /* Output and Generation of Labels */
597 #define GLOBAL_ASM_OP "\t.global\t"
599 /* Output of Assembler Instructions */
601 #define REGISTER_NAMES { \
602 "r0", "r2", "r1", "r3", \
603 "a0", "a1", "sb", "fb", "sp", \
604 "pc", "flg", "argp", \
605 "mem0", "mem2", "mem4", "mem6", "mem8", "mem10", "mem12", "mem14", \
608 #define ADDITIONAL_REGISTER_NAMES { \
616 #define PRINT_OPERAND(S,X,C) m32c_print_operand (S, X, C)
617 #define PRINT_OPERAND_PUNCT_VALID_P(C) m32c_print_operand_punct_valid_p (C)
618 #define PRINT_OPERAND_ADDRESS(S,X) m32c_print_operand_address (S, X)
620 #undef USER_LABEL_PREFIX
621 #define USER_LABEL_PREFIX "_"
623 #define ASM_OUTPUT_REG_PUSH(S,R) m32c_output_reg_push (S, R)
624 #define ASM_OUTPUT_REG_POP(S,R) m32c_output_reg_pop (S, R)
626 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(STREAM, DECL, NAME, SIZE, ALIGNMENT) \
627 m32c_output_aligned_common (STREAM, DECL, NAME, SIZE, ALIGNMENT, 1)
629 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(STREAM, DECL, NAME, SIZE, ALIGNMENT) \
630 m32c_output_aligned_common (STREAM, DECL, NAME, SIZE, ALIGNMENT, 0)
633 /* Output of Dispatch Tables */
635 #define ASM_OUTPUT_ADDR_VEC_ELT(S,V) \
636 fprintf (S, "\t.word L%d\n", V)
638 /* Assembler Commands for Exception Regions */
640 #define DWARF_CIE_DATA_ALIGNMENT -1
642 /* Assembler Commands for Alignment */
644 #define ASM_OUTPUT_ALIGN(STREAM,POWER) \
645 fprintf (STREAM, "\t.p2align\t%d\n", POWER);
647 /* Controlling Debugging Information Format */
649 #define DWARF2_ADDR_SIZE 4
651 /* Miscellaneous Parameters */
653 #define HAS_LONG_COND_BRANCH false
654 #define HAS_LONG_UNCOND_BRANCH true
655 #define CASE_VECTOR_MODE SImode
656 #define LOAD_EXTEND_OP(MEM) ZERO_EXTEND
659 #define TRULY_NOOP_TRUNCATION(op,ip) 1
661 #define STORE_FLAG_VALUE 1
663 /* 16- or 24-bit pointers */
664 #define Pmode (TARGET_A16 ? HImode : PSImode)
665 #define FUNCTION_MODE QImode
667 #define REGISTER_TARGET_PRAGMAS() m32c_register_pragmas()