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 and config/cris/linux.h) are responsible for lots of settings not
37 repeated below. This file contains general CRIS definitions
38 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. */
98 "%{mtune=*:-D__tune_%* %{mtune=v*:-D__CRIS_arch_tune=%*}\
99 %{mtune=etrax4:-D__tune_v3 -D__CRIS_arch_tune=3}\
100 %{mtune=etrax100:-D__tune_v8 -D__CRIS_arch_tune=8}\
101 %{mtune=svinto:-D__tune_v8 -D__CRIS_arch_tune=8}\
102 %{mtune=etrax100lx:-D__tune_v10 -D__CRIS_arch_tune=10}\
103 %{mtune=ng:-D__tune_v10 -D__CRIS_arch_tune=10}}\
104 %{mcpu=*:-D__arch_%* %{mcpu=v*:-D__CRIS_arch_version=%*}\
105 %{mcpu=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
106 %{mcpu=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
107 %{mcpu=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
108 %{mcpu=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
109 %{mcpu=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
110 %{march=*:-D__arch_%* %{march=v*:-D__CRIS_arch_version=%*}\
111 %{march=etrax4:-D__arch_v3 -D__CRIS_arch_version=3}\
112 %{march=etrax100:-D__arch_v8 -D__CRIS_arch_version=8}\
113 %{march=svinto:-D__arch_v8 -D__CRIS_arch_version=8}\
114 %{march=etrax100lx:-D__arch_v10 -D__CRIS_arch_version=10}\
115 %{march=ng:-D__arch_v10 -D__CRIS_arch_version=10}}\
116 %{metrax100:-D__arch__v8 -D__CRIS_arch_version=8}\
117 %{metrax4:-D__arch__v3 -D__CRIS_arch_version=3}\
120 /* For the cris-*-elf subtarget. */
122 #define CRIS_DEFAULT_TUNE "10"
123 #define CRIS_ARCH_CPP_DEFAULT
124 #define CRIS_DEFAULT_ASM_ARCH_OPTION ""
126 #ifdef TARGET_CPU_DEFAULT
127 #if TARGET_CPU_DEFAULT != 32 && TARGET_CPU_DEFAULT != 10
128 #error "Due to '()'; e.g. '#define TARGET_CPU_DEFAULT (10)', stringize TARGET_CPU_DEFAULT isn't useful: update manually."
131 #if TARGET_CPU_DEFAULT == 32
132 #undef CRIS_DEFAULT_TUNE
133 #define CRIS_DEFAULT_TUNE "32"
134 /* To enable use of "generic" cris-axis-elf binutils, always pass the
135 architecture option to GAS. (We don't do this for non-v32.) */
136 #undef CRIS_DEFAULT_ASM_ARCH_OPTION
137 #define CRIS_DEFAULT_ASM_ARCH_OPTION "--march=v32"
140 #undef CRIS_ARCH_CPP_DEFAULT
141 #define CRIS_ARCH_CPP_DEFAULT \
145 %{!mtune=*:-D__tune_v" CRIS_DEFAULT_TUNE "}\
146 -D__arch_v"CRIS_DEFAULT_TUNE\
147 " -D__CRIS_arch_version=" CRIS_DEFAULT_TUNE "}}}"
150 #define CRIS_CPP_SUBTARGET_SPEC \
151 "%{mbest-lib-options:\
152 %{!moverride-best-lib-options:\
153 %{!march=*:%{!metrax*:%{!mcpu=*:\
154 -D__tune_v" CRIS_DEFAULT_TUNE \
155 " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}}}}"\
156 CRIS_ARCH_CPP_DEFAULT
158 /* Override previous definitions (../linux.h). */
161 "%{metrax4:-march=v3}\
162 %{metrax100:-march=v8}\
163 %{march=*:-march=%*}\
167 /* For the cris-*-elf subtarget. */
168 #define CRIS_CC1_SUBTARGET_SPEC \
170 %{mbest-lib-options:\
171 %{!moverride-best-lib-options:\
172 %{!march=*:%{!mcpu=*:-mtune=v" CRIS_DEFAULT_TUNE\
173 " -D__CRIS_arch_tune=" CRIS_DEFAULT_TUNE "}}\
174 %{!finhibit-size-directive:\
175 %{!fno-function-sections: -ffunction-sections}\
176 %{!fno-data-sections: -fdata-sections}}}}"
178 /* This adds to CC1_SPEC. */
179 #define CC1PLUS_SPEC ""
181 #ifdef HAVE_AS_NO_MUL_BUG_ABORT_OPTION
182 #define MAYBE_AS_NO_MUL_BUG_ABORT \
183 "%{mno-mul-bug-workaround:-no-mul-bug-abort} "
185 #define MAYBE_AS_NO_MUL_BUG_ABORT
188 /* Override previous definitions (../linux.h). */
191 MAYBE_AS_NO_MUL_BUG_ABORT \
193 %{march=*:%{mcpu=*:%edo not specify both -march=... and -mcpu=...}}\
194 %{march=v0|mcpu=v0|march=v3|mcpu=v3|march=v8|mcpu=v8:--march=v0_v10}\
195 %{march=v10|mcpu=v10:--march=v10}\
196 %{march=v32|mcpu=v32:--march=v32}"
198 /* For the cris-*-elf subtarget. */
199 #define CRIS_ASM_SUBTARGET_SPEC \
200 "--em=criself %{!march=*:%{!mcpu=*:" CRIS_DEFAULT_ASM_ARCH_OPTION "}}"
202 /* FIXME: We should propagate the -melf option to make the criself
203 "emulation" unless a linker script is provided (-T*), but I don't know
204 how to do that if either of -Ttext, -Tdata or -Tbss is given but no
205 linker script, as is usually the case. Leave it to the user for the
212 /* For the cris-*-elf subtarget. */
213 #define CRIS_LINK_SUBTARGET_SPEC \
215 %{sim2:%{!T*:-Tdata 0x4000000 -Tbss 0x8000000}}\
216 %{!r:%{O2|O3: --gc-sections}}"
218 /* Which library to get. The simulator uses a different library for
219 the low-level syscalls (implementing the Linux syscall ABI instead
220 of direct-iron accesses). Default everything with the stub "nosys"
222 /* Override previous definitions (linux.h). */
225 "%{sim*:--start-group -lc -lsyslinux --end-group}\
227 %{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} -lbsp}\
230 /* Linker startfile options; crt0 flavors.
231 We need to remove any previous definition (elfos.h). */
232 #undef STARTFILE_SPEC
233 #define STARTFILE_SPEC \
234 "%{sim*:crt1.o%s}%{!sim*:crt0.o%s}\
235 crti.o%s crtbegin.o%s"
238 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
240 #define EXTRA_SPECS \
241 {"cpp_subtarget", CRIS_CPP_SUBTARGET_SPEC}, \
242 {"cc1_subtarget", CRIS_CC1_SUBTARGET_SPEC}, \
243 {"asm_subtarget", CRIS_ASM_SUBTARGET_SPEC}, \
244 {"link_subtarget", CRIS_LINK_SUBTARGET_SPEC}, \
245 CRIS_SUBTARGET_EXTRA_SPECS
247 #define CRIS_SUBTARGET_EXTRA_SPECS
250 /* Node: Run-time Target */
252 #define TARGET_CPU_CPP_BUILTINS() \
255 builtin_define_std ("cris"); \
256 builtin_define_std ("CRIS"); \
257 builtin_define_std ("GNU_CRIS"); \
258 builtin_define ("__CRIS_ABI_version=2"); \
259 builtin_assert ("cpu=cris"); \
260 builtin_assert ("machine=cris"); \
264 /* Previously controlled by target_flags. Note that this is *not* set
266 #define TARGET_LINUX 0
268 /* For the cris-*-elf subtarget. */
269 #define CRIS_SUBTARGET_DEFAULT 0
271 #define CRIS_CPU_BASE 0
272 #define CRIS_CPU_ETRAX4 3 /* Just lz added. */
273 #define CRIS_CPU_SVINTO 8 /* Added swap, jsrc & Co., 32-bit accesses. */
274 #define CRIS_CPU_NG 10 /* Added mul[su]. */
275 #define CRIS_CPU_V32 32 /* Major changes. */
277 #ifndef TARGET_CPU_DEFAULT
278 #define TARGET_CPU_DEFAULT CRIS_CPU_BASE
281 /* Default target_flags if no switches specified.
282 The alignment-by-32 is to make builtin atomic support for v10 and v32
283 work for *-elf for types without specified alignment (like plain
284 "int"). See top comment in sync.md. */
285 #ifndef TARGET_DEFAULT
286 # if TARGET_CPU_DEFAULT == 32
287 # define TARGET_DEFAULT \
289 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
291 + MASK_PROLOGUE_EPILOGUE)
292 # elif TARGET_CPU_DEFAULT == 10
293 # define TARGET_DEFAULT \
294 (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
295 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
297 + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
299 # define TARGET_DEFAULT \
300 (MASK_SIDE_EFFECT_PREFIXES + MASK_STACK_ALIGN \
301 + MASK_CONST_ALIGN + MASK_DATA_ALIGN \
302 + MASK_PROLOGUE_EPILOGUE + MASK_MUL_BUG)
306 /* Local, providing a default for cris_cpu_version. */
307 #define CRIS_DEFAULT_CPU_VERSION TARGET_CPU_DEFAULT
309 #define TARGET_HAS_MUL_INSNS (cris_cpu_version >= CRIS_CPU_NG)
310 #define TARGET_HAS_LZ (cris_cpu_version >= CRIS_CPU_ETRAX4)
311 #define TARGET_HAS_BREAK (cris_cpu_version >= CRIS_CPU_ETRAX4)
312 #define TARGET_HAS_SWAP (cris_cpu_version >= CRIS_CPU_SVINTO)
313 #define TARGET_V32 (cris_cpu_version >= CRIS_CPU_V32)
315 /* The "break" instruction was introduced with ETRAX 4. */
316 #define TARGET_TRAP_USING_BREAK8 \
317 (cris_trap_using_break8 == 2 ? TARGET_HAS_BREAK : cris_trap_using_break8)
319 /* The < v10 atomics turn off interrupts, so they don't need alignment.
320 Incidentally, by default alignment is off there causing variables to
321 be default unaligned all over, so we'd have to make support
322 libraries use a proper atomic type (instead of "int"), one we'd
323 specify as aligned. */
324 #define TARGET_TRAP_UNALIGNED_ATOMIC \
325 (cris_trap_unaligned_atomic == 2 \
326 ? (TARGET_V32 || cris_cpu_version == 10) \
327 : cris_trap_unaligned_atomic)
329 /* Node: Storage Layout */
331 #define BITS_BIG_ENDIAN 0
333 #define BYTES_BIG_ENDIAN 0
335 /* WORDS_BIG_ENDIAN is not defined in the hardware, but for consistency,
336 we use little-endianness, and we may also be able to use
337 post-increment on DImode indirect. */
338 #define WORDS_BIG_ENDIAN 0
340 #define UNITS_PER_WORD 4
342 #define CRIS_PROMOTED_MODE(MODE, UNSIGNEDP, TYPE) \
343 (GET_MODE_CLASS (MODE) == MODE_INT && GET_MODE_SIZE (MODE) < 4) \
346 /* We will be using prototype promotion, so they will be 32 bit. */
347 #define PARM_BOUNDARY 32
349 /* Stack boundary is guided by -mstack-align, -mno-stack-align,
351 Old comment: (2.1: still valid in 2.7.2?)
352 Note that to make this macro affect the alignment of stack
353 locals, a fix was required, and special precautions when handling
354 the stack pointer in various other macros (TARGET_ASM_FUNCTION_PROLOGUE
355 et al) were required. See file "function.c". If you would just define
356 this macro, it would only affect the builtin alloca and variable
357 local data (non-ANSI, non-K&R, Gnu C extension). */
358 #define STACK_BOUNDARY \
359 (TARGET_STACK_ALIGN ? (TARGET_ALIGN_BY_32 ? 32 : 16) : 8)
361 #define FUNCTION_BOUNDARY 16
363 /* Do not change BIGGEST_ALIGNMENT (when optimizing), as it will affect
364 strange places, at least in 2.1. */
365 #define BIGGEST_ALIGNMENT 8
367 /* If -m16bit, -m16-bit, -malign or -mdata-align,
368 align everything to 16 bit. */
369 #define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
371 ? (TARGET_ALIGN_BY_32 \
372 ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN) \
373 : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
375 /* Note that CONSTANT_ALIGNMENT has the effect of making gcc believe that
376 ALL references to constant stuff (in code segment, like strings) has
377 this alignment. That is a rather rushed assumption. Luckily we do not
378 care about the "alignment" operand to builtin memcpy (only place where
379 it counts), so it doesn't affect any bad spots. */
380 #define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
381 (TARGET_CONST_ALIGN \
382 ? (TARGET_ALIGN_BY_32 \
383 ? (BASIC_ALIGN < 32 ? 32 : BASIC_ALIGN) \
384 : (BASIC_ALIGN < 16 ? 16 : BASIC_ALIGN)) : BASIC_ALIGN)
386 /* FIXME: Define LOCAL_ALIGNMENT for word and dword or arrays and
387 structures (if -mstack-align=), and check that it is good. */
389 #define EMPTY_FIELD_BOUNDARY 8
391 #define STRUCTURE_SIZE_BOUNDARY 8
393 #define STRICT_ALIGNMENT 0
395 /* Remove any previous definition (elfos.h).
396 ??? If it wasn't for all the other stuff that affects layout of
397 structures and bit-fields, this could presumably cause incompatibility
398 with other GNU/Linux ports (i.e. elfos.h users). */
399 #undef PCC_BITFIELD_TYPE_MATTERS
401 /* This is only used for non-scalars. Strange stuff happens to structs
402 (FIXME: What?) if we use anything larger than largest actually used
403 datum size, so lets make it 32. The type "long long" will still work
404 as usual. We can still have DImode insns, but they will only be used
405 for scalar data (i.e. long long). */
406 #define MAX_FIXED_MODE_SIZE 32
409 /* Node: Type Layout */
411 /* Note that DOUBLE_TYPE_SIZE is not defined anymore, since the default
412 value gives a 64-bit double, which is what we now use. */
414 /* For compatibility and historical reasons, a char should be signed. */
415 #define DEFAULT_SIGNED_CHAR 1
417 /* Note that WCHAR_TYPE_SIZE is used in cexp.y,
418 where TARGET_SHORT is not available. */
420 #define WCHAR_TYPE "long int"
422 #undef WCHAR_TYPE_SIZE
423 #define WCHAR_TYPE_SIZE 32
426 /* Node: Register Basics */
428 /* We count all 16 non-special registers, SRP, a faked argument
429 pointer register, MOF and CCR/DCCR. */
430 #define FIRST_PSEUDO_REGISTER (16 + 1 + 1 + 1 + 1)
432 /* For CRIS, these are r15 (pc) and r14 (sp). Register r8 is used as a
433 frame-pointer, but is not fixed. SRP is not included in general
434 registers and will not be used automatically. All other special
435 registers are fixed at the moment. The faked argument pointer register
437 #define FIXED_REGISTERS \
438 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1}
440 /* Register r9 is used for structure-address, r10-r13 for parameters,
441 r10- for return values. */
442 #define CALL_USED_REGISTERS \
443 {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1}
445 /* Node: Allocation Order */
447 /* We need this on CRIS, because call-used regs should be used first,
448 (so we don't need to push). Else start using registers from r0 and up.
449 This preference is mainly because if we put call-used-regs from r0
450 and up, then we can't use movem to push the rest, (which have to be
451 saved if we use them, and movem has to start with r0).
452 Change here if you change which registers to use as call registers.
454 The actual need to explicitly prefer call-used registers improved the
455 situation a lot for 2.1, but might not actually be needed anymore.
456 Still, this order reflects what GCC should find out by itself, so it
457 probably does not hurt.
459 Order of preference: Call-used-regs first, then r0 and up, last fp &
461 Call-used regs in opposite order, so they will cause less conflict if
462 a function has few args (<= 3) and it wants a scratch reg.
463 Use struct-return address first, since very few functions use
464 structure return values so it is likely to be available. */
465 #define REG_ALLOC_ORDER \
466 {9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 14, 15, 17, 16, 18, 19}
468 /* Use MOF and ACR. Prefer ACR before any other register. Prefer MOF
469 then SRP after saved registers. The *after* is because they're only
470 useful for storage, not for things being computed, which is
471 apparently more common. */
472 #define REG_ALLOC_ORDER_V32 \
473 {15, 9, 13, 12, 11, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 17, 16, 14, 18, 19}
476 /* Node: Values in Registers */
478 /* The VOIDmode test is so we can omit mode on anonymous insns. FIXME:
479 Still needed in 2.9x, at least for Axis-20000319. */
480 #define HARD_REGNO_NREGS(REGNO, MODE) \
482 ? 1 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
484 /* CRIS permits all registers to hold all modes. Well, except for the
485 condition-code register. And we can't hold larger-than-register size
486 modes in the last special register that can hold a full 32 bits. */
487 #define HARD_REGNO_MODE_OK(REGNO, MODE) \
489 || (REGNO) != CRIS_CC0_REGNUM) \
490 && (GET_MODE_SIZE (MODE) <= UNITS_PER_WORD \
491 || ((REGNO) != CRIS_MOF_REGNUM && (REGNO) != CRIS_ACR_REGNUM)))
493 /* Because CCmode isn't covered by the "narrower mode" statement in
494 tm.texi, we can still say all modes are tieable despite not having an
495 always 1 HARD_REGNO_MODE_OK. */
496 #define MODES_TIEABLE_P(MODE1, MODE2) 1
499 /* Node: Leaf Functions */
500 /* (no definitions) */
502 /* Node: Stack Registers */
503 /* (no definitions) */
506 /* Node: Register Classes */
508 /* We need a separate register class to handle register allocation for
509 ACR, since it can't be used for post-increment.
511 It's not obvious, but having subunions of all movable-between
512 register classes does really help register allocation (pre-IRA
517 ACR_REGS
, MOF_REGS
, SRP_REGS
, CC0_REGS
,
518 MOF_SRP_REGS
, SPECIAL_REGS
,
519 SPEC_ACR_REGS
, GENNONACR_REGS
,
520 SPEC_GENNONACR_REGS
, GENERAL_REGS
,
525 #define N_REG_CLASSES (int) LIM_REG_CLASSES
527 #define REG_CLASS_NAMES \
529 "ACR_REGS", "MOF_REGS", "SRP_REGS", "CC0_REGS", \
530 "MOF_SRP_REGS", "SPECIAL_REGS", \
531 "SPEC_ACR_REGS", "GENNONACR_REGS", "SPEC_GENNONACR_REGS", \
532 "GENERAL_REGS", "ALL_REGS"}
534 #define CRIS_SPECIAL_REGS_CONTENTS \
535 ((1 << CRIS_SRP_REGNUM) | (1 << CRIS_MOF_REGNUM) | (1 << CRIS_CC0_REGNUM))
537 /* Count in the faked argument register in GENERAL_REGS. Keep out SRP. */
538 #define REG_CLASS_CONTENTS \
541 {1 << CRIS_ACR_REGNUM}, \
542 {1 << CRIS_MOF_REGNUM}, \
543 {1 << CRIS_SRP_REGNUM}, \
544 {1 << CRIS_CC0_REGNUM}, \
545 {(1 << CRIS_MOF_REGNUM) \
546 | (1 << CRIS_SRP_REGNUM)}, \
547 {CRIS_SPECIAL_REGS_CONTENTS}, \
548 {CRIS_SPECIAL_REGS_CONTENTS \
549 | (1 << CRIS_ACR_REGNUM)}, \
550 {(0xffff | (1 << CRIS_AP_REGNUM)) \
551 & ~(1 << CRIS_ACR_REGNUM)}, \
552 {(0xffff | (1 << CRIS_AP_REGNUM) \
553 | CRIS_SPECIAL_REGS_CONTENTS) \
554 & ~(1 << CRIS_ACR_REGNUM)}, \
555 {0xffff | (1 << CRIS_AP_REGNUM)}, \
556 {0xffff | (1 << CRIS_AP_REGNUM) \
557 | CRIS_SPECIAL_REGS_CONTENTS} \
560 #define REGNO_REG_CLASS(REGNO) \
561 ((REGNO) == CRIS_ACR_REGNUM ? ACR_REGS : \
562 (REGNO) == CRIS_MOF_REGNUM ? MOF_REGS : \
563 (REGNO) == CRIS_SRP_REGNUM ? SRP_REGS : \
564 (REGNO) == CRIS_CC0_REGNUM ? CC0_REGS : \
567 #define BASE_REG_CLASS GENERAL_REGS
569 #define MODE_CODE_BASE_REG_CLASS(MODE, AS, OCODE, ICODE) \
570 ((OCODE) != POST_INC ? BASE_REG_CLASS : GENNONACR_REGS)
572 #define INDEX_REG_CLASS GENERAL_REGS
574 /* Since it uses reg_renumber, it is safe only once reg_renumber
575 has been allocated, which happens in local-alloc.c. */
576 #define REGNO_OK_FOR_BASE_P(REGNO) \
577 ((REGNO) <= CRIS_LAST_GENERAL_REGISTER \
578 || (REGNO) == ARG_POINTER_REGNUM \
579 || (unsigned) reg_renumber[REGNO] <= CRIS_LAST_GENERAL_REGISTER \
580 || (unsigned) reg_renumber[REGNO] == ARG_POINTER_REGNUM)
582 /* REGNO_OK_FOR_BASE_P seems to be obsolete wrt. this one, but not yet
583 documented as such. */
584 #define REGNO_MODE_CODE_OK_FOR_BASE_P(REGNO, MODE, AS, OCODE, ICODE) \
585 (REGNO_OK_FOR_BASE_P (REGNO) \
586 && ((OCODE) != POST_INC \
587 || !((REGNO) == CRIS_ACR_REGNUM \
588 || (unsigned) reg_renumber[REGNO] == CRIS_ACR_REGNUM)))
590 /* See REGNO_OK_FOR_BASE_P. */
591 #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P(REGNO)
593 /* We can't move special registers to and from memory in smaller than
594 word_mode. We also can't move between special registers. Luckily,
595 -1, as returned by true_regnum for non-sub/registers, is valid as a
596 parameter to our REGNO_REG_CLASS, returning GENERAL_REGS, so we get
597 the effect that any X that isn't a special-register is treated as
598 a non-empty intersection with GENERAL_REGS. */
599 #define SECONDARY_RELOAD_CLASS(CLASS, MODE, X) \
600 ((reg_class_subset_p (CLASS, SPECIAL_REGS) \
601 && ((GET_MODE_SIZE (MODE) < 4 && MEM_P (X)) \
602 || !reg_classes_intersect_p (REGNO_REG_CLASS (true_regnum (X)), \
604 ? GENERAL_REGS : NO_REGS)
606 /* FIXME: Fix regrename.c; it should check validity of replacements,
607 not just with a silly pass-specific macro. We may miss some
608 opportunities, but we must stop regrename from creating acr++. */
609 #define HARD_REGNO_RENAME_OK(FROM, TO) ((TO) != CRIS_ACR_REGNUM)
611 /* For CRIS, this is always the size of MODE in words,
612 since all registers are the same size. To use omitted modes in
613 patterns with reload constraints, you must say the widest size
614 which is allowed for VOIDmode.
615 FIXME: Does that still apply for gcc-2.9x? Keep poisoned until such
616 patterns are added back. News: 2001-03-16: Happens as early as the
618 #define CLASS_MAX_NREGS(CLASS, MODE) \
619 ((MODE) == VOIDmode \
620 ? 1 /* + cris_fatal ("CLASS_MAX_NREGS with VOIDmode") */ \
621 : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
624 /* Node: Frame Layout */
626 #define STACK_GROWS_DOWNWARD
627 #define FRAME_GROWS_DOWNWARD 1
629 /* It seems to be indicated in the code (at least 2.1) that this is
630 better a constant, and best 0. */
631 #define STARTING_FRAME_OFFSET 0
633 #define FIRST_PARM_OFFSET(FNDECL) 0
635 #define RETURN_ADDR_RTX(COUNT, FRAMEADDR) \
636 cris_return_addr_rtx (COUNT, FRAMEADDR)
638 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, CRIS_SRP_REGNUM)
640 /* FIXME: Any __builtin_eh_return callers must not return anything and
641 there must not be collisions with incoming parameters. Luckily the
642 number of __builtin_eh_return callers is limited. For now return
643 parameter registers in reverse order and hope for the best. */
644 #define EH_RETURN_DATA_REGNO(N) \
645 (IN_RANGE ((N), 0, 3) ? (CRIS_FIRST_ARG_REG + 3 - (N)) : INVALID_REGNUM)
647 /* Store the stack adjustment in the structure-return-address register. */
648 #define CRIS_STACKADJ_REG CRIS_STRUCT_VALUE_REGNUM
649 #define EH_RETURN_STACKADJ_RTX gen_rtx_REG (SImode, CRIS_STACKADJ_REG)
651 #define EH_RETURN_HANDLER_RTX \
652 cris_return_addr_rtx (0, NULL)
654 #define INIT_EXPANDERS cris_init_expanders ()
656 /* FIXME: Move this to right node (it's not documented properly yet). */
657 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (CRIS_SRP_REGNUM)
659 /* FIXME: Move this to right node (it's not documented properly yet).
660 FIXME: Check what alignment we can assume regarding
661 TARGET_STACK_ALIGN and TARGET_ALIGN_BY_32. */
662 #define DWARF_CIE_DATA_ALIGNMENT -1
664 /* If we would ever need an exact mapping between canonical register
665 number and dwarf frame register, we would either need to include all
666 registers in the gcc description (with some marked fixed of course), or
667 an inverse mapping from dwarf register to gcc register. There is one
668 need in dwarf2out.c:expand_builtin_init_dwarf_reg_sizes. Right now, I
669 don't see that we need exact correspondence between DWARF *frame*
670 registers and DBX_REGISTER_NUMBER, so map them onto GCC registers. */
671 #define DWARF_FRAME_REGNUM(REG) (REG)
673 /* Node: Stack Checking */
674 /* (no definitions) FIXME: Check. */
676 /* Node: Frame Registers */
678 #define STACK_POINTER_REGNUM CRIS_SP_REGNUM
680 /* Register used for frame pointer. This is also the last of the saved
681 registers, when a frame pointer is not used. */
682 #define FRAME_POINTER_REGNUM CRIS_FP_REGNUM
684 /* Faked register, is always eliminated. We need it to eliminate
685 allocating stack slots for the return address and the frame pointer. */
686 #define ARG_POINTER_REGNUM CRIS_AP_REGNUM
688 #define STATIC_CHAIN_REGNUM CRIS_STATIC_CHAIN_REGNUM
691 /* Node: Elimination */
693 #define ELIMINABLE_REGS \
694 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
695 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
696 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
698 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
699 (OFFSET) = cris_initial_elimination_offset (FROM, TO)
702 /* Node: Stack Arguments */
704 /* Since many parameters take up one register each in any case,
705 defining TARGET_PROMOTE_PROTOTYPES that always returns true would
706 seem like a good idea, but measurements indicate that a combination
707 using PROMOTE_MODE is better. */
709 #define ACCUMULATE_OUTGOING_ARGS 1
712 /* Node: Register Arguments */
714 /* Contrary to what you'd believe, defining FUNCTION_ARG_CALLEE_COPIES
715 seems like a (small total) loss, at least for gcc-2.7.2 compiling and
716 running gcc-2.1 (small win in size, small loss running -- 100.1%),
717 and similarly for size for products (.1 .. .3% bloat, sometimes win).
718 Due to the empirical likeliness of making slower code, it is not
721 /* This no longer *needs* to be a structure; but keeping it as such should
722 not hurt (and hacking the ABI is simpler). */
723 #define CUMULATIVE_ARGS struct cum_args
724 struct cum_args
{int regs
;};
726 /* The regs member is an integer, the number of arguments got into
728 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
731 #define FUNCTION_ARG_REGNO_P(REGNO) \
732 ((REGNO) >= CRIS_FIRST_ARG_REG \
733 && (REGNO) < CRIS_FIRST_ARG_REG + (CRIS_MAX_ARGS_IN_REGS))
736 /* Node: Aggregate Return */
738 #define CRIS_STRUCT_VALUE_REGNUM ((CRIS_FIRST_ARG_REG) - 1)
741 /* Node: Caller Saves */
742 /* (no definitions) */
744 /* Node: Function entry */
746 /* See cris.c for TARGET_ASM_FUNCTION_PROLOGUE and
747 TARGET_ASM_FUNCTION_EPILOGUE. */
749 /* Node: Profiling */
751 #define FUNCTION_PROFILER(FILE, LABELNO) \
752 error ("no FUNCTION_PROFILER for CRIS")
754 /* FIXME: Some of the undefined macros might be mandatory. If so, fix
758 /* Node: Trampolines */
760 #define TRAMPOLINE_SIZE (TARGET_V32 ? 58 : 32)
762 /* CRIS wants instructions on word-boundary. */
763 #define TRAMPOLINE_ALIGNMENT 16
765 /* Node: Library Calls */
767 /* If you change this, you have to check whatever libraries and systems
769 #define TARGET_EDOM 33
772 /* Node: Addressing Modes */
774 #define HAVE_POST_INCREMENT 1
776 /* Must be a compile-time constant, so we go with the highest value
777 among all CRIS variants. */
778 #define MAX_REGS_PER_ADDRESS 2
780 /* Fix reloads known to cause suboptimal spilling. */
781 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, INDL, WIN) \
784 if (cris_reload_address_legitimized (X, MODE, OPNUM, TYPE, INDL)) \
790 /* Node: Condition Code */
792 #define NOTICE_UPDATE_CC(EXP, INSN) cris_notice_update_cc (EXP, INSN)
794 /* FIXME: Maybe define CANONICALIZE_COMPARISON later, when playing with
795 optimizations. It is needed; currently we do this with instruction
796 patterns and NOTICE_UPDATE_CC. */
801 /* Regardless of the presence of delay slots, the default value of 1 for
802 BRANCH_COST is the best in the range (1, 2, 3), tested with gcc-2.7.2
803 with testcases ipps and gcc, giving smallest and fastest code. */
805 #define SLOW_BYTE_ACCESS 0
807 /* This is the threshold *below* which inline move sequences of
808 word-length sizes will be emitted. The "9" will translate to
809 (9 - 1) * 4 = 32 bytes maximum moved, but using 16 instructions
810 (8 instruction sequences) or less. */
811 #define MOVE_RATIO(speed) 9
816 #define TEXT_SECTION_ASM_OP "\t.text"
818 #define DATA_SECTION_ASM_OP "\t.data"
820 /* The jump table is immediately connected to the preceding insn. */
821 #define JUMP_TABLES_IN_TEXT_SECTION 1
828 enum cris_pic_symbol_type
833 cris_got_symbol_needing_fixup
= 3,
834 cris_invalid_pic_symbol
= 4
837 #define PIC_OFFSET_TABLE_REGNUM (flag_pic ? CRIS_GOT_REGNUM : INVALID_REGNUM)
839 #define LEGITIMATE_PIC_OPERAND_P(X) cris_legitimate_pic_operand (X)
842 /* Node: File Framework */
844 /* We don't want an .ident for gcc. To avoid that but still support
845 #ident, we override TARGET_ASM_OUTPUT_IDENT and, since the gcc .ident
846 is its only use besides front-end .ident directives, we return if
847 the state if the cgraph is not CGRAPH_STATE_PARSING. */
848 #undef TARGET_ASM_OUTPUT_IDENT
849 #define TARGET_ASM_OUTPUT_IDENT cris_asm_output_ident
851 #define ASM_APP_ON "#APP\n"
853 #define ASM_APP_OFF "#NO_APP\n"
856 /* Node: Data Output */
858 #define IS_ASM_LOGICAL_LINE_SEPARATOR(C, STR) (C) == '@'
860 /* Node: Uninitialized Data */
862 /* Remember to round off odd values if we want data alignment,
863 since we cannot do that with an .align directive.
865 Using .comm causes the space not to be reserved in .bss, but by
866 tricks with the symbol type. Not good if other tools than binutils
867 are used on the object files. Since ".global ... .lcomm ..." works, we
868 use that. Use .._ALIGNED_COMMON, since gcc whines when we only have
869 ..._COMMON, and we prefer to whine ourselves; BIGGEST_ALIGNMENT is not
871 /* FIXME: I suspect a bug in gcc with alignment. Do not warn until
872 investigated; it mucks up the testsuite results. */
873 #define CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, LOCAL) \
876 int align_ = (ALIGN) / BITS_PER_UNIT; \
877 if (TARGET_DATA_ALIGN && TARGET_ALIGN_BY_32 && align_ < 4) \
879 else if (TARGET_DATA_ALIGN && align_ < 2) \
881 /* FIXME: Do we need this? */ \
882 else if (align_ < 1) \
887 fprintf ((FILE), "%s", LOCAL_ASM_OP); \
888 assemble_name ((FILE), (NAME)); \
889 fprintf ((FILE), "\n"); \
891 fprintf ((FILE), "%s", COMMON_ASM_OP); \
892 assemble_name ((FILE), (NAME)); \
893 fprintf ((FILE), ",%u,%u\n", (int)(SIZE), align_); \
897 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
898 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 0)
900 #undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
901 #define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
902 CRIS_ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN, 1)
904 /* Node: Label Output */
906 /* Globalizing directive for a label. */
907 #define GLOBAL_ASM_OP "\t.global "
909 #define SUPPORTS_WEAK 1
911 #define ASM_OUTPUT_SYMBOL_REF(STREAM, SYM) \
912 cris_asm_output_symbol_ref (STREAM, SYM)
914 #define ASM_OUTPUT_LABEL_REF(STREAM, BUF) \
915 cris_asm_output_label_ref (STREAM, BUF)
917 /* Remove any previous definition (elfos.h). */
918 #undef ASM_GENERATE_INTERNAL_LABEL
919 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
920 sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long) NUM)
922 /* Node: Initialization */
923 /* (no definitions) */
925 /* Node: Macros for Initialization */
926 /* (no definitions) */
928 /* Node: Instruction Output */
930 #define REGISTER_NAMES \
931 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
932 "r9", "r10", "r11", "r12", "r13", "sp", "acr", "srp", "mof", "faked_ap", "dccr"}
934 #define ADDITIONAL_REGISTER_NAMES \
935 {{"r14", 14}, {"r15", 15}, {"pc", 15}}
937 /* Output an empty line to illustrate the presence of the delay slot. */
938 #define DBR_OUTPUT_SEQEND(FILE) \
941 #define LOCAL_LABEL_PREFIX "."
943 /* cppinit.c initializes a const array from this, so it must be constant,
944 can't have it different based on options. Luckily, the prefix is
945 always allowed, so let's have it on all GCC-generated code. Note that
946 we have this verbatim everywhere in the back-end, not using %R or %s or
948 #define REGISTER_PREFIX "$"
950 /* Remove any previous definition (elfos.h). */
951 /* We use -fno-leading-underscore to remove it, when necessary. */
952 #undef USER_LABEL_PREFIX
953 #define USER_LABEL_PREFIX "_"
955 #define ASM_OUTPUT_REG_PUSH(FILE, REGNO) \
958 ? "\tsubq 4,$sp\n\tmove $%s,[$sp]\n" : "\tpush $%s\n", \
961 #define ASM_OUTPUT_REG_POP(FILE, REGNO) \
962 fprintf (FILE, "\tmove [$sp+],$%s\n", reg_names[REGNO])
965 /* Node: Dispatch Tables */
967 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \
971 asm_fprintf (FILE, "\t.word %LL%d-.\n", VALUE); \
973 asm_fprintf (FILE, "\t.word %LL%d-%LL%d\n", VALUE, REL); \
977 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
978 asm_fprintf (FILE, "\t.dword %LL%d\n", VALUE)
980 /* Defined to also emit an .align in elfos.h. We don't want that. */
981 #undef ASM_OUTPUT_CASE_LABEL
983 /* Since the "bound" insn loads the comparison value if the compared<
984 value (register) is out of bounds (0..comparison value-1), we need
985 to output another case to catch it.
986 The way to find it is to look for the label_ref at the else-arm inside
987 the expanded casesi core-insn.
988 FIXME: Check this construct when changing to new version of gcc. */
989 #define ASM_OUTPUT_CASE_END(STREAM, NUM, TABLE) \
990 cris_asm_output_case_end (STREAM, NUM, TABLE)
993 /* Node: Exception Region Output */
994 /* (no definitions) */
995 /* FIXME: Fill in with our own optimized layout. */
997 /* Node: Alignment Output */
999 #define ASM_OUTPUT_ALIGN(FILE, LOG) \
1000 fprintf (FILE, "\t.align %d\n", (LOG))
1003 /* Node: All Debuggers */
1005 #define DBX_REGISTER_NUMBER(REGNO) \
1006 ((REGNO) == CRIS_SRP_REGNUM ? CRIS_CANONICAL_SRP_REGNUM : \
1007 (REGNO) == CRIS_MOF_REGNUM ? CRIS_CANONICAL_MOF_REGNUM : \
1008 (REGNO) == CRIS_CC0_REGNUM ? CRIS_CANONICAL_CC0_REGNUM : \
1011 /* FIXME: Investigate DEBUGGER_AUTO_OFFSET, DEBUGGER_ARG_OFFSET. */
1014 /* Node: DBX Options */
1016 /* Is this correct? Check later. */
1017 #define DBX_NO_XREFS
1019 #define DBX_CONTIN_LENGTH 0
1021 /* FIXME: Is this needed when we have 0 DBX_CONTIN_LENGTH? */
1022 #define DBX_CONTIN_CHAR '?'
1025 /* Node: DBX Hooks */
1026 /* (no definitions) */
1028 /* Node: File names and DBX */
1029 /* (no definitions) */
1032 /* Node: SDB and DWARF */
1033 /* (no definitions) */
1037 /* A combination of the bound (umin) insn together with a
1038 sign-extended add via the table to PC seems optimal.
1039 If the table overflows, the assembler will take care of it.
1040 Theoretically, in extreme cases (uncertain if they occur), an error
1041 will be emitted, so FIXME: Check how large case-tables are emitted,
1042 possible add an option to emit SImode case-tables. */
1043 #define CASE_VECTOR_MODE HImode
1045 #define CASE_VECTOR_PC_RELATIVE 1
1047 /* FIXME: Investigate CASE_VECTOR_SHORTEN_MODE to make sure HImode is not
1048 used when broken-.word could possibly fail (plus testcase). */
1050 #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
1052 /* This is the number of bytes that can be moved in one
1053 reasonably fast instruction sequence. For CRIS, this is two
1054 instructions: mem => reg, reg => mem. */
1057 /* Maybe SHIFT_COUNT_TRUNCATED is safe to define? FIXME: Check later. */
1059 #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
1061 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1062 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) ((VALUE) = 32, 1)
1064 #define Pmode SImode
1066 #define FUNCTION_MODE QImode
1068 #define NO_IMPLICIT_EXTERN_C
1072 * eval: (c-set-style "gnu")
1073 * indent-tabs-mode: t