1 /* Definitions for GCC. Part of the machine description for CRIS.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,
3 2009, 2010, 2011 Free Software Foundation, Inc.
4 Contributed by Axis Communications. Written by Hans-Peter Nilsson.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public 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/>. */
22 /* After the first "Node:" comment comes all preprocessor directives and
23 attached declarations described in the info files, the "Using and
24 Porting GCC" manual (uapgcc), in the same order as found in the "Target
25 macros" section in the gcc-2.9x CVS edition of 2000-03-17. FIXME: Not
26 really, but needs an update anyway.
28 There is no generic copy-of-uapgcc comment, you'll have to see uapgcc
29 for that. If applicable, there is a CRIS-specific comment. The order
30 of macro definitions follow the order in the manual. Every section in
31 the manual (node in the info pages) has an introductory `Node:
32 <subchapter>' comment. If no macros are defined for a section, only
33 the section-comment is present. */
35 /* Note that other header files (e.g. config/elfos.h, config/linux.h,
36 config/cris/linux.h and config/cris/aout.h) are responsible for lots of
37 settings not repeated below. This file contains general CRIS
38 definitions and definitions for the cris-*-elf subtarget. */
40 /* We don't want to use gcc_assert for everything, as that can be
42 #define CRIS_ASSERT(x) \
43 do { if (!(x)) internal_error ("CRIS-port assertion failed: " #x); } while (0)
45 /* Replacement for REG_P since it does not match SUBREGs. Happens for
46 testcase Axis-20000320 with gcc-2.9x. */
48 (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (XEXP (x, 0))))
50 /* Last register in main register bank r0..r15. */
51 #define CRIS_LAST_GENERAL_REGISTER 15
53 /* Descriptions of registers used for arguments. */
54 #define CRIS_FIRST_ARG_REG 10
55 #define CRIS_MAX_ARGS_IN_REGS 4
57 /* See also *_REGNUM constants in cris.md. */
59 /* Most of the time, we need the index into the register-names array.
60 When passing debug-info, we need the real hardware register number. */
61 #define CRIS_CANONICAL_SRP_REGNUM (16 + 11)
62 #define CRIS_CANONICAL_MOF_REGNUM (16 + 7)
63 /* We have CCR in all models including v10, but that's 16 bits, so let's
64 prefer the DCCR number, which is a DMA pointer in pre-v8, so we'll
65 never clash with it for GCC purposes. */
66 #define CRIS_CANONICAL_CC0_REGNUM (16 + 13)
68 /* When generating PIC, these suffixes are added to the names of non-local
69 functions when being output. Contrary to other ports, we have offsets
70 relative to the GOT, not the PC. We might implement PC-relative PLT
71 semantics later for the general case; they are used in some cases right
72 now, such as MI thunks. */
73 #define CRIS_GOTPLT_SUFFIX ":GOTPLT"
74 #define CRIS_PLT_GOTOFFSET_SUFFIX ":PLTG"
75 #define CRIS_PLT_PCOFFSET_SUFFIX ":PLT"
77 #define CRIS_FUNCTION_ARG_SIZE(MODE, TYPE) \
78 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) \
79 : (unsigned) int_size_in_bytes (TYPE))
81 /* Which CPU version this is. The parsed and adjusted cris_cpu_str. */
82 extern int cris_cpu_version
;
84 /* Changing the order used to be necessary to put the fourth __make_dp
85 argument (a DImode parameter) in registers, to fit with the libfunc
86 parameter passing scheme used for intrinsic functions. FIXME: Check
89 #define __make_dp(a,b,c,d) __cris_make_dp(d,a,b,c)
95 /* Also provide canonical vN definitions when user specifies an alias.
96 Note that -melf overrides -maout. */
99 "%{mtune=*:-D__tune_%* %{mtune=v*:-D__CRIS_arch_tune=%*}\
100 %{mtune=etrax4:-D__tune_v3 -D__CRIS_arch_tune=3}\
101 %{mtune=etrax100:-D__tune_v8 -D__CRIS_arch_tune=8}\
102 %{mtune=svinto:-D__tune_v8 -D__CRIS_arch_tune=8}\
103 %{mtune=etrax100lx:-D__tune_v10 -D__CRIS_arch_tune=10}\
104 %{mtune=ng:-D__tune_v10 -D__CRIS_arch_tune=10}}\
105 %{mcpu=*:-D__arch_%* %{mcpu=v*:-D__CRIS_arch_version=%*}\
106 %{mcpu=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
107 %{mcpu=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
108 %{mcpu=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
109 %{mcpu=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
110 %{mcpu=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
111 %{march=*:-D__arch_%* %{march=v*:-D__CRIS_arch_version=%*}\
112 %{march=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
113 %{march=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
114 %{march=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
115 %{march=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
116 %{march=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
117 %{metrax100:-D__arch__v8 -D__CRIS_arch_version=8}\
118 %{metrax4:-D__arch__v3 -D__CRIS_arch_version=3}\
121 /* For the cris-*-elf subtarget. */
123 #define CRIS_DEFAULT_TUNE "10"
124 #define CRIS_ARCH_CPP_DEFAULT
125 #define CRIS_DEFAULT_ASM_ARCH_OPTION ""
127 #ifdef TARGET_CPU_DEFAULT
128 #if TARGET_CPU_DEFAULT != 32 && TARGET_CPU_DEFAULT != 10
129 #error "Due to '()'; e.g. '#define TARGET_CPU_DEFAULT (10)', stringize TARGET_CPU_DEFAULT isn't useful: update manually."
132 #if TARGET_CPU_DEFAULT == 32
133 #undef CRIS_DEFAULT_TUNE
134 #define CRIS_DEFAULT_TUNE "32"
135 /* To enable use of "generic" cris-axis-elf binutils, always pass the
136 architecture option to GAS. (We don't do this for non-v32.) */
137 #undef CRIS_DEFAULT_ASM_ARCH_OPTION
138 #define CRIS_DEFAULT_ASM_ARCH_OPTION "--march=v32"
141 #undef CRIS_ARCH_CPP_DEFAULT
142 #define CRIS_ARCH_CPP_DEFAULT \
146 %{!mtune=*:-D__tune_v" CRIS_DEFAULT_TUNE "}\
147 -D__arch_v"CRIS_DEFAULT_TUNE\
148 " -D__CRIS_arch_version=" CRIS_DEFAULT_TUNE "}}}"
151 #define CRIS_CPP_SUBTARGET_SPEC \
152 "%{mbest-lib-options:\
153 %{!moverride-best-lib-options:\
154 %{!march=*:%{!metrax*:%{!mcpu=*:\
155 -D__tune_v" CRIS_DEFAULT_TUNE \
156 " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}}}}"\
157 CRIS_ARCH_CPP_DEFAULT
159 /* Override previous definitions (../linux.h). */
162 "%{metrax4:-march=v3}\
163 %{metrax100:-march=v8}\
164 %{march=*:-march=%*}\
168 /* For the cris-*-elf subtarget. */
169 #define CRIS_CC1_SUBTARGET_SPEC \
171 %{mbest-lib-options:\
172 %{!moverride-best-lib-options:\
173 %{!march=*:%{!mcpu=*:-mtune=v" CRIS_DEFAULT_TUNE\
174 " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}\
175 %{!finhibit-size-directive:\
176 %{!fno-function-sections: -ffunction-sections}\
177 %{!fno-data-sections: -fdata-sections}}}}"
179 /* This adds to CC1_SPEC. */
180 #define CC1PLUS_SPEC ""
182 #ifdef HAVE_AS_NO_MUL_BUG_ABORT_OPTION
183 #define MAYBE_AS_NO_MUL_BUG_ABORT \
184 "%{mno-mul-bug-workaround:-no-mul-bug-abort} "
186 #define MAYBE_AS_NO_MUL_BUG_ABORT
189 /* Override previous definitions (../linux.h). */
192 MAYBE_AS_NO_MUL_BUG_ABORT \
194 %{march=*:%{mcpu=*:%edo not specify both -march=... and -mcpu=...}}\
195 %{march=v0|mcpu=v0|march=v3|mcpu=v3|march=v8|mcpu=v8:--march=v0_v10}\
196 %{march=v10|mcpu=v10:--march=v10}\
197 %{march=v32|mcpu=v32:--march=v32}"
199 /* For the cris-*-elf subtarget. */
200 #define CRIS_ASM_SUBTARGET_SPEC \
201 "--em=criself %{!march=*:%{!mcpu=*:" CRIS_DEFAULT_ASM_ARCH_OPTION "}}"
203 /* FIXME: We should propagate the -melf option to make the criself
204 "emulation" unless a linker script is provided (-T*), but I don't know
205 how to do that if either of -Ttext, -Tdata or -Tbss is given but no
206 linker script, as is usually the case. Leave it to the user for the
209 Note that -melf overrides -maout except that a.out-compiled libraries
210 are linked in (multilibbing). We'd need some %s-variant that
211 checked for existence of some specific file. */
217 /* For the cris-*-elf subtarget. */
218 #define CRIS_LINK_SUBTARGET_SPEC \
220 %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
221 %{!r:%{O2|O3: --gc-sections}}"
223 /* Which library to get. The simulator uses a different library for
224 the low-level syscalls (implementing the Linux syscall ABI instead
225 of direct-iron accesses). Default everything with the stub "nosys"
227 /* Override previous definitions (linux.h). */
230 "%{sim*:--start-group -lc -lsyslinux --end-group}\
232 %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
235 /* Linker startfile options; crt0 flavors.
236 We need to remove any previous definition (elfos.h). */
237 #undef STARTFILE_SPEC
238 #define STARTFILE_SPEC \
239 "%{sim*:crt1.o%s}%{!sim*:crt0.o%s}\
240 crti.o%s crtbegin.o%s"
243 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
245 #define EXTRA_SPECS \
246 {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC}, \
247 {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC}, \
248 {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC}, \
249 {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
250 CRIS_SUBTARGET_EXTRA_SPECS
252 #define CRIS_SUBTARGET_EXTRA_SPECS
255 /* Node: Run-time Target */
257 #define TARGET_CPU_CPP_BUILTINS() \
260 builtin_define_std ("cris"); \
261 builtin_define_std ("CRIS"); \
262 builtin_define_std ("GNU_CRIS"); \
263 builtin_define ("__CRIS_ABI_version=2"); \
264 builtin_assert ("cpu=cris"); \
265 builtin_assert ("machine=cris"); \
269 /* Previously controlled by target_flags. */
272 /* Previously controlled by target_flags. Note that this is *not* set
274 #define TARGET_LINUX 0
276 /* For the cris-*-elf subtarget. */
277 #define CRIS_SUBTARGET_DEFAULT 0
279 #define CRIS_CPU_BASE 0
280 #define CRIS_CPU_ETRAX4 3 /* Just lz added. */
281 #define CRIS_CPU_SVINTO 8 /* Added swap, jsrc & Co., 32-bit accesses. */
282 #define CRIS_CPU_NG 10 /* Added mul[su]. */
283 #define CRIS_CPU_V32 32 /* Major changes. */
285 #ifndef TARGET_CPU_DEFAULT
286 #define TARGET_CPU_DEFAULT CRIS_CPU_BASE
289 /* Default target_flags if no switches specified.
290 The alignment-by-32 is to make builtin atomic support for v10 and v32
291 work for *-elf for types without specified alignment (like plain
292 "int"). See top comment in sync.md. */
293 #ifndef TARGET_DEFAULT
294 # if TARGET_CPU_DEFAULT == 32
295 # define TARGET_DEFAULT \
297 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
299 + MASK_PROLOGUE_EPILOGUE)
300 # elif TARGET_CPU_DEFAULT == 10
301 # define TARGET_DEFAULT \
302 (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
303 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
305 + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
307 # define TARGET_DEFAULT \
308 (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
309 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
310 + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
314 /* Local, providing a default for cris_cpu_version. */
315 #define CRIS_DEFAULT_CPU_VERSION TARGET_CPU_DEFAULT
317 #define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
318 #define TARGET_HAS_LZ (cris_cpu_version >= CRIS_CPU_ETRAX4)
319 #define TARGET_HAS_BREAK (cris_cpu_version >= CRIS_CPU_ETRAX4)
320 #define TARGET_HAS_SWAP (cris_cpu_version >= CRIS_CPU_SVINTO)
321 #define TARGET_V32 (cris_cpu_version >= CRIS_CPU_V32)
323 /* The "break" instruction was introduced with ETRAX 4. */
324 #define TARGET_TRAP_USING_BREAK8 \
325 (cris_trap_using_break8 == 2 ? TARGET_HAS_BREAK : cris_trap_using_break8)
327 /* The < v10 atomics turn off interrupts, so they don't need alignment.
328 Incidentally, by default alignment is off there causing variables to
329 be default unaligned all over, so we'd have to make support
330 libraries use a proper atomic type (instead of "int"), one we'd
331 specify as aligned. */
332 #define TARGET_TRAP_UNALIGNED_ATOMIC \
333 (cris_trap_unaligned_atomic == 2 \
334 ? (TARGET_V32 || cris_cpu_version == 10) \
335 : cris_trap_unaligned_atomic)
337 /* Node: Storage Layout */
339 #define BITS_BIG_ENDIAN 0
341 #define BYTES_BIG_ENDIAN 0
343 /* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
344 we use little-endianness, and we may also be able to use
345 post-increment on DImode indirect. */
346 #define WORDS_BIG_ENDIAN 0
348 #define UNITS_PER_WORD 4
350 #define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
351 (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
354 /* We will be using prototype promotion, so they will be 32 bit. */
355 #define PARM_BOUNDARY 32
357 /* Stack boundary is guided by -mstack-align, -mno-stack-align,
359 Old comment: (2.1: still valid in 2.7.2?)
360 Note that to make this macro affect the alignment of stack
361 locals, a fix was required, and special precautions when handling
362 the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
363 et al) were required. See file "function.c". If you would just define
364 this macro, it would only affect the builtin alloca and variable
365 local data (non-ANSI, non-K&R, Gnu C extension). */
366 #define STACK_BOUNDARY \
367 (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
369 #define FUNCTION_BOUNDARY 16
371 /* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
372 strange places, at least in 2.1. */
373 #define BIGGEST_ALIGNMENT 8
375 /* If -m16bit, -m16-bit, -malign or -mdata-align,
376 align everything to 16 bit. */
377 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
379 ? (TARGET_ALIGN_BY_32 \
380 ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN) \
381 : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
383 /* Note that CONSTANT_ALIGNMENT has the effect of making gcc believe that
384 ALL references to constant stuff (in code segment, like strings) has
385 this alignment. That is a rather rushed assumption. Luckily we do not
386 care about the "alignment" operand to builtin memcpy (only place where
387 it counts), so it doesn't affect any bad spots. */
388 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
389 (TARGET_CONST_ALIGN \
390 ? (TARGET_ALIGN_BY_32 \
391 ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN) \
392 : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
394 /* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
395 structures (if -mstack-align=), and check that it is good. */
397 #define EMPTY_FIELD_BOUNDARY 8
399 #define STRUCTURE_SIZE_BOUNDARY 8
401 #define STRICT_ALIGNMENT 0
403 /* Remove any previous definition (elfos.h).
404 ??? If it wasn't for all the other stuff that affects layout of
405 structures and bit-fields, this could presumably cause incompatibility
406 with other GNU/Linux ports (i.e. elfos.h users). */
407 #undef PCC_BITFIELD_TYPE_MATTERS
409 /* This is only used for non-scalars. Strange stuff happens to structs
410 (FIXME: What?) if we use anything larger than largest actually used
411 datum size, so lets make it 32. The type "long long" will still work
412 as usual. We can still have DImode insns, but they will only be used
413 for scalar data (i.e. long long). */
414 #define MAX_FIXED_MODE_SIZE 32
417 /* Node: Type Layout */
419 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
420 value gives a 64-bit double, which is what we now use. */
422 /* For compatibility and historical reasons, a char should be signed. */
423 #define DEFAULT_SIGNED_CHAR 1
425 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
426 where TARGET_SHORT is not available. */
428 #define WCHAR_TYPE "long int"
430 #undef WCHAR_TYPE_SIZE
431 #define WCHAR_TYPE_SIZE 32
434 /* Node: Register Basics */
436 /* We count all 16 non-special registers, SRP, a faked argument
437 pointer register, MOF and CCR/DCCR. */
438 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1)
440 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
441 frame-pointer, but is not fixed. SRP is not included in general
442 registers and will not be used automatically. All other special
443 registers are fixed at the moment. The faked argument pointer register
445 #define FIXED_REGISTERS \
446 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1}
448 /* Register r9 is used for structure-address, r10-r13 for parameters,
449 r10- for return values. */
450 #define CALL_USED_REGISTERS \
451 {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1}
453 /* Node: Allocation Order */
455 /* We need this on CRIS, because call-used regs should be used first,
456 (so we don't need to push). Else start using registers from r0 and up.
457 This preference is mainly because if we put call-used-regs from r0
458 and up, then we can't use movem to push the rest, (which have to be
459 saved if we use them, and movem has to start with r0).
460 Change here if you change which registers to use as call registers.
462 The actual need to explicitly prefer call-used registers improved the
463 situation a lot for 2.1, but might not actually be needed anymore.
464 Still, this order reflects what GCC should find out by itself, so it
465 probably does not hurt.
467 Order of preference: Call-used-regs first, then r0 and up, last fp &
469 Call-used regs in opposite order, so they will cause less conflict if
470 a function has few args (<= 3) and it wants a scratch reg.
471 Use struct-return address first, since very few functions use
472 structure return values so it is likely to be available. */
473 #define REG_ALLOC_ORDER \
474 {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19}
476 /* Use MOF and ACR. Prefer ACR before any other register. Prefer MOF
477 then SRP after saved registers. The *after* is because they're only
478 useful for storage, not for things being computed, which is
479 apparently more common. */
480 #define REG_ALLOC_ORDER_V32 \
481 {15, 9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 17, 16, 14, 18, 19}
484 /* Node: Values in Registers */
486 /* The VOIDmode test is so we can omit mode on anonymous insns. FIXME:
487 Still needed in 2.9x, at least for Axis-20000319. */
488 #define HARD_REGNO_NREGS(REGNO, MODE) \
490 ? 1 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
492 /* CRIS permits all registers to hold all modes. Well, except for the
493 condition-code register. And we can't hold larger-than-register size
494 modes in the last special register that can hold a full 32 bits. */
495 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
497 || (REGNO) != CRIS_CC0_REGNUM) \
498 && (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD \
499 || ((REGNO) != CRIS_MOF_REGNUM && (REGNO) != CRIS_ACR_REGNUM)))
501 /* Because CCmode isn't covered by the "narrower mode" statement in
502 tm.texi, we can still say all modes are tieable despite not having an
503 always 1 HARD_REGNO_MODE_OK. */
504 #define MODES_TIEABLE_P(MODE1, MODE2) 1
507 /* Node: Leaf Functions */
508 /* (no definitions) */
510 /* Node: Stack Registers */
511 /* (no definitions) */
514 /* Node: Register Classes */
516 /* We need a separate register class to handle register allocation for
517 ACR, since it can't be used for post-increment.
519 It's not obvious, but having subunions of all movable-between
520 register classes does really help register allocation (pre-IRA
525 ACR_REGS
, MOF_REGS
, SRP_REGS
, CC0_REGS
,
526 MOF_SRP_REGS
, SPECIAL_REGS
,
527 SPEC_ACR_REGS
, GENNONACR_REGS
,
528 SPEC_GENNONACR_REGS
, GENERAL_REGS
,
533 #define N_REG_CLASSES (int) LIM_REG_CLASSES
535 #define REG_CLASS_NAMES \
537 "ACR_REGS", "MOF_REGS", "SRP_REGS", "CC0_REGS", \
538 "MOF_SRP_REGS", "SPECIAL_REGS", \
539 "SPEC_ACR_REGS", "GENNONACR_REGS", "SPEC_GENNONACR_REGS", \
540 "GENERAL_REGS", "ALL_REGS"}
542 #define CRIS_SPECIAL_REGS_CONTENTS \
543 ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
545 /* Count in the faked argument register in GENERAL_REGS. Keep out SRP. */
546 #define REG_CLASS_CONTENTS \
549 {1 << CRIS_ACR_REGNUM}, \
550 {1 << CRIS_MOF_REGNUM}, \
551 {1 << CRIS_SRP_REGNUM}, \
552 {1 << CRIS_CC0_REGNUM}, \
553 {(1 << CRIS_MOF_REGNUM) \
554 | (1 << CRIS_SRP_REGNUM)}, \
555 {CRIS_SPECIAL_REGS_CONTENTS}, \
556 {CRIS_SPECIAL_REGS_CONTENTS \
557 | (1 << CRIS_ACR_REGNUM)}, \
558 {(0xffff | (1 << CRIS_AP_REGNUM)) \
559 & ~(1 << CRIS_ACR_REGNUM)}, \
560 {(0xffff | (1 << CRIS_AP_REGNUM) \
561 | CRIS_SPECIAL_REGS_CONTENTS) \
562 & ~(1 << CRIS_ACR_REGNUM)}, \
563 {0xffff | (1 << CRIS_AP_REGNUM)}, \
564 {0xffff | (1 << CRIS_AP_REGNUM) \
565 | CRIS_SPECIAL_REGS_CONTENTS} \
568 #define REGNO_REG_CLASS(REGNO) \
569 ((REGNO) == CRIS_ACR_REGNUM ? ACR_REGS : \
570 (REGNO) == CRIS_MOF_REGNUM ? MOF_REGS : \
571 (REGNO) == CRIS_SRP_REGNUM ? SRP_REGS : \
572 (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS : \
575 #define BASE_REG_CLASS GENERAL_REGS
577 #define MODE_CODE_BASE_REG_CLASS(MODE, AS, OCODE, ICODE) \
578 ((OCODE) != POST_INC ? BASE_REG_CLASS : GENNONACR_REGS)
580 #define INDEX_REG_CLASS GENERAL_REGS
582 /* Since it uses reg_renumber, it is safe only once reg_renumber
583 has been allocated, which happens in local-alloc.c. */
584 #define REGNO_OK_FOR_BASE_P(REGNO) \
585 ((REGNO) <= CRIS_LAST_GENERAL_REGISTER \
586 || (REGNO) == ARG_POINTER_REGNUM \
587 || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER \
588 || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
590 /* REGNO_OK_FOR_BASE_P seems to be obsolete wrt. this one, but not yet
591 documented as such. */
592 #define REGNO_MODE_CODE_OK_FOR_BASE_P(REGNO, MODE, AS, OCODE, ICODE) \
593 (REGNO_OK_FOR_BASE_P (REGNO) \
594 && ((OCODE) != POST_INC \
595 || !((REGNO) == CRIS_ACR_REGNUM \
596 || (unsigned) reg_renumber[REGNO] == CRIS_ACR_REGNUM)))
598 /* See REGNO_OK_FOR_BASE_P. */
599 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
601 /* We can't move special registers to and from memory in smaller than
602 word_mode. We also can't move between special registers. Luckily,
603 -1, as returned by true_regnum for non-sub/registers, is valid as a
604 parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
605 the effect that any X that isn't a special-register is treated as
606 a non-empty intersection with GENERAL_REGS. */
607 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X) \
608 ((reg_class_subset_p (CLASS, SPECIAL_REGS) \
609 && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X)) \
610 || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)), \
612 ? GENERAL_REGS : NO_REGS)
614 /* FIXME: Fix regrename.c; it should check validity of replacements,
615 not just with a silly pass-specific macro. We may miss some
616 opportunities, but we must stop regrename from creating acr++. */
617 #define HARD_REGNO_RENAME_OK(FROM, TO) ((TO) != CRIS_ACR_REGNUM)
619 /* For CRIS, this is always the size of MODE in words,
620 since all registers are the same size. To use omitted modes in
621 patterns with reload constraints, you must say the widest size
622 which is allowed for VOIDmode.
623 FIXME: Does that still apply for gcc-2.9x? Keep poisoned until such
624 patterns are added back. News: 2001-03-16: Happens as early as the
626 #define CLASS_MAX_NREGS(CLASS, MODE) \
627 ((MODE) == VOIDmode \
628 ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */ \
629 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
632 /* Node: Frame Layout */
634 #define STACK_GROWS_DOWNWARD
635 #define FRAME_GROWS_DOWNWARD 1
637 /* It seems to be indicated in the code (at least 2.1) that this is
638 better a constant, and best 0. */
639 #define STARTING_FRAME_OFFSET 0
641 #define FIRST_PARM_OFFSET(FNDECL) 0
643 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
644 cris_return_addr_rtx (COUNT, FRAMEADDR)
646 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
648 /* FIXME: Any __builtin_eh_return callers must not return anything and
649 there must not be collisions with incoming parameters. Luckily the
650 number of __builtin_eh_return callers is limited. For now return
651 parameter registers in reverse order and hope for the best. */
652 #define EH_RETURN_DATA_REGNO(N) \
653 (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
655 /* Store the stack adjustment in the structure-return-address register. */
656 #define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
657 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
659 #define EH_RETURN_HANDLER_RTX \
660 cris_return_addr_rtx (0, NULL)
662 #define INIT_EXPANDERS cris_init_expanders ()
664 /* FIXME: Move this to right node (it's not documented properly yet). */
665 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
667 /* FIXME: Move this to right node (it's not documented properly yet).
668 FIXME: Check what alignment we can assume regarding
669 TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32. */
670 #define DWARF_CIE_DATA_ALIGNMENT -1
672 /* If we would ever need an exact mapping between canonical register
673 number and dwarf frame register, we would either need to include all
674 registers in the gcc description (with some marked fixed of course), or
675 an inverse mapping from dwarf register to gcc register. There is one
676 need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes. Right now, I
677 don't see that we need exact correspondence between DWARF *frame*
678 registers and DBX_REGISTER_NUMBER, so map them onto GCC registers. */
679 #define DWARF_FRAME_REGNUM(REG) (REG)
681 /* Node: Stack Checking */
682 /* (no definitions) FIXME: Check. */
684 /* Node: Frame Registers */
686 #define STACK_POINTER_REGNUM CRIS_SP_REGNUM
688 /* Register used for frame pointer. This is also the last of the saved
689 registers, when a frame pointer is not used. */
690 #define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
692 /* Faked register, is always eliminated. We need it to eliminate
693 allocating stack slots for the return address and the frame pointer. */
694 #define ARG_POINTER_REGNUM CRIS_AP_REGNUM
696 #define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
699 /* Node: Elimination */
701 #define ELIMINABLE_REGS \
702 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
703 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
704 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
706 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
707 (OFFSET) = cris_initial_elimination_offset (FROM, TO)
710 /* Node: Stack Arguments */
712 /* Since many parameters take up one register each in any case,
713 defining TARGET_PROMOTE_PROTOTYPES that always returns true would
714 seem like a good idea, but measurements indicate that a combination
715 using PROMOTE_MODE is better. */
717 #define ACCUMULATE_OUTGOING_ARGS 1
720 /* Node: Register Arguments */
722 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
723 seems like a (small total) loss, at least for gcc-2.7.2 compiling and
724 running gcc-2.1 (small win in size, small loss running -- 100.1%),
725 and similarly for size for products (.1 .. .3% bloat, sometimes win).
726 Due to the empirical likeliness of making slower code, it is not
729 /* This no longer *needs* to be a structure; but keeping it as such should
730 not hurt (and hacking the ABI is simpler). */
731 #define CUMULATIVE_ARGS struct cum_args
732 struct cum_args
{int regs
;};
734 /* The regs member is an integer, the number of arguments got into
736 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
739 #define FUNCTION_ARG_REGNO_P(REGNO) \
740 ((REGNO) >= CRIS_FIRST_ARG_REG \
741 && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
744 /* Node: Aggregate Return */
746 #define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
749 /* Node: Caller Saves */
750 /* (no definitions) */
752 /* Node: Function entry */
754 /* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
755 TARGET_ASM_FUNCTION_EPILOGUE. */
757 /* Node: Profiling */
759 #define FUNCTION_PROFILER(FILE, LABELNO) \
760 error ("no FUNCTION_PROFILER for CRIS")
762 /* FIXME: Some of the undefined macros might be mandatory. If so, fix
766 /* Node: Trampolines */
768 #define TRAMPOLINE_SIZE (TARGET_V32 ? 58 : 32)
770 /* CRIS wants instructions on word-boundary. */
771 #define TRAMPOLINE_ALIGNMENT 16
773 /* Node: Library Calls */
775 /* If you change this, you have to check whatever libraries and systems
777 #define TARGET_EDOM 33
780 /* Node: Addressing Modes */
782 #define HAVE_POST_INCREMENT 1
784 /* Must be a compile-time constant, so we go with the highest value
785 among all CRIS variants. */
786 #define MAX_REGS_PER_ADDRESS 2
788 /* Fix reloads known to cause suboptimal spilling. */
789 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN) \
792 if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
798 /* Node: Condition Code */
800 #define NOTICE_UPDATE_CC(EXP, INSN) cris_notice_update_cc (EXP, INSN)
802 /* FIXME: Maybe define CANONICALIZE_COMPARISON later, when playing with
803 optimizations. It is needed; currently we do this with instruction
804 patterns and NOTICE_UPDATE_CC. */
809 /* Regardless of the presence of delay slots, the default value of 1 for
810 BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
811 with testcases ipps and gcc, giving smallest and fastest code. */
813 #define SLOW_BYTE_ACCESS 0
815 /* This is the threshold *below* which inline move sequences of
816 word-length sizes will be emitted. The "9" will translate to
817 (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
818 (8 instruction sequences) or less. */
819 #define MOVE_RATIO(speed) 9
824 #define TEXT_SECTION_ASM_OP "\t.text"
826 #define DATA_SECTION_ASM_OP "\t.data"
828 #define FORCE_EH_FRAME_INFO_IN_DATA_SECTION (! TARGET_ELF)
830 /* The jump table is immediately connected to the preceding insn. */
831 #define JUMP_TABLES_IN_TEXT_SECTION 1
838 enum cris_pic_symbol_type
843 cris_got_symbol_needing_fixup
= 3,
844 cris_invalid_pic_symbol
= 4
847 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? CRIS_GOT_REGNUM : INVALID_REGNUM)
849 #define LEGITIMATE_PIC_OPERAND_P(X) cris_legitimate_pic_operand (X)
852 /* Node: File Framework */
854 /* We don't want an .ident for gcc. To avoid that but still support
855 #ident, we override ASM_OUTPUT_IDENT and, since the gcc .ident is its
856 only use besides ASM_OUTPUT_IDENT, undef IDENT_ASM_OP from elfos.h. */
858 #undef ASM_OUTPUT_IDENT
859 #define ASM_OUTPUT_IDENT(FILE, NAME) \
860 fprintf (FILE, "%s\"%s\"\n", "\t.ident\t", NAME);
862 #define ASM_APP_ON "#APP\n"
864 #define ASM_APP_OFF "#NO_APP\n"
867 /* Node: Data Output */
869 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
871 /* Node: Uninitialized Data */
873 /* Remember to round off odd values if we want data alignment,
874 since we cannot do that with an .align directive.
876 Using .comm causes the space not to be reserved in .bss, but by
877 tricks with the symbol type. Not good if other tools than binutils
878 are used on the object files. Since ".global ... .lcomm ..." works, we
879 use that. Use .._ALIGNED_COMMON, since gcc whines when we only have
880 ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
881 the one to check. This done for a.out only. */
882 /* FIXME: I suspect a bug in gcc with alignment. Do not warn until
883 investigated; it mucks up the testsuite results. */
884 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
887 int align_ = (ALIGN) / BITS_PER_UNIT; \
888 if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4) \
890 else if (TARGET_DATA_ALIGN && align_ < 2) \
892 /* FIXME: Do we need this? */ \
893 else if (align_ < 1) \
900 fprintf ((FILE), "%s", LOCAL_ASM_OP); \
901 assemble_name ((FILE), (NAME)); \
902 fprintf ((FILE), "\n"); \
904 fprintf ((FILE), "%s", COMMON_ASM_OP); \
905 assemble_name ((FILE), (NAME)); \
906 fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_); \
910 /* We can't tell a one-only or weak COMM from a "global \
911 COMM" so just make all non-locals weak. */ \
913 ASM_WEAKEN_LABEL (FILE, NAME); \
914 fputs ("\t.lcomm ", (FILE)); \
915 assemble_name ((FILE), (NAME)); \
916 fprintf ((FILE), ",%u\n", \
917 ((int)(SIZE) + (align_ - 1)) & ~(align_ - 1)); \
922 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
923 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
925 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
926 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
927 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
929 /* Node: Label Output */
931 /* Globalizing directive for a label. */
932 #define GLOBAL_ASM_OP "\t.global "
934 #define SUPPORTS_WEAK 1
936 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
937 cris_asm_output_symbol_ref (STREAM, SYM)
939 #define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
940 cris_asm_output_label_ref (STREAM, BUF)
942 /* Remove any previous definition (elfos.h). */
943 #undef ASM_GENERATE_INTERNAL_LABEL
944 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
945 sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
947 /* Node: Initialization */
948 /* (no definitions) */
950 /* Node: Macros for Initialization */
951 /* (no definitions) */
953 /* Node: Instruction Output */
955 #define REGISTER_NAMES \
956 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
957 "r9", "r10", "r11", "r12", "r13", "sp", "acr", "srp", "mof", "faked_ap", "dccr"}
959 #define ADDITIONAL_REGISTER_NAMES \
960 {{"r14", 14}, {"r15", 15}, {"pc", 15}}
962 /* Output an empty line to illustrate the presence of the delay slot. */
963 #define DBR_OUTPUT_SEQEND(FILE) \
966 #define LOCAL_LABEL_PREFIX (TARGET_ELF ? "." : "")
968 /* cppinit.c initializes a const array from this, so it must be constant,
969 can't have it different based on options. Luckily, the prefix is
970 always allowed, so let's have it on all GCC-generated code. Note that
971 we have this verbatim everywhere in the back-end, not using %R or %s or
973 #define REGISTER_PREFIX "$"
975 /* Remove any previous definition (elfos.h). */
976 /* We use -fno-leading-underscore to remove it, when necessary. */
977 #undef USER_LABEL_PREFIX
978 #define USER_LABEL_PREFIX "_"
980 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO) \
983 ? "\tsubq 4,$sp\n\tmove $%s,[$sp]\n" : "\tpush $%s\n", \
986 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
987 fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
990 /* Node: Dispatch Tables */
992 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
996 asm_fprintf (FILE, "\t.word %LL%d-.\n", VALUE); \
998 asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL); \
1002 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
1003 asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
1005 /* Defined to also emit an .align in elfos.h. We don't want that. */
1006 #undef ASM_OUTPUT_CASE_LABEL
1008 /* Since the "bound" insn loads the comparison value if the compared<
1009 value (register) is out of bounds (0..comparison value-1), we need
1010 to output another case to catch it.
1011 The way to find it is to look for the label_ref at the else-arm inside
1012 the expanded casesi core-insn.
1013 FIXME: Check this construct when changing to new version of gcc. */
1014 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE) \
1015 cris_asm_output_case_end (STREAM, NUM, TABLE)
1018 /* Node: Exception Region Output */
1019 /* (no definitions) */
1020 /* FIXME: Fill in with our own optimized layout. */
1022 /* Node: Alignment Output */
1024 #define ASM_OUTPUT_ALIGN(FILE, LOG) \
1025 fprintf (FILE, "\t.align %d\n", (LOG))
1028 /* Node: All Debuggers */
1030 #define DBX_REGISTER_NUMBER(REGNO) \
1031 ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM : \
1032 (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM : \
1033 (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM : \
1036 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET. */
1039 /* Node: DBX Options */
1041 /* Is this correct? Check later. */
1042 #define DBX_NO_XREFS
1044 #define DBX_CONTIN_LENGTH 0
1046 /* FIXME: Is this needed when we have 0 DBX_CONTIN_LENGTH? */
1047 #define DBX_CONTIN_CHAR '?'
1050 /* Node: DBX Hooks */
1051 /* (no definitions) */
1053 /* Node: File names and DBX */
1054 /* (no definitions) */
1057 /* Node: SDB and DWARF */
1058 /* (no definitions) */
1062 /* A combination of the bound (umin) insn together with a
1063 sign-extended add via the table to PC seems optimal.
1064 If the table overflows, the assembler will take care of it.
1065 Theoretically, in extreme cases (uncertain if they occur), an error
1066 will be emitted, so FIXME: Check how large case-tables are emitted,
1067 possible add an option to emit SImode case-tables. */
1068 #define CASE_VECTOR_MODE HImode
1070 #define CASE_VECTOR_PC_RELATIVE 1
1072 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
1073 used when broken-.word could possibly fail (plus testcase). */
1075 #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
1077 /* This is the number of bytes that can be moved in one
1078 reasonably fast instruction sequence. For CRIS, this is two
1079 instructions: mem => reg, reg => mem. */
1082 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define? FIXME: Check later. */
1084 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1086 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1087 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1089 #define Pmode SImode
1091 #define FUNCTION_MODE QImode
1093 #define NO_IMPLICIT_EXTERN_C
1097 * eval: (c-set-style "gnu")
1098 * indent-tabs-mode: t