[thirdparty/gcc.git] / gcc / config / nios2 / nios2.h

/* Definitions of target machine for Altera Nios II.
   Copyright (C) 2012-2024 Free Software Foundation, Inc.
   Contributed by Jonah Graham (jgraham@altera.com), 
   Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com).
   Contributed by Mentor Graphics, Inc.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published
   by the Free Software Foundation; either version 3, or (at your
   option) any later version.

   GCC is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
   License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING3.  If not see
   <http://www.gnu.org/licenses/>.  */

#ifndef GCC_NIOS2_H
#define GCC_NIOS2_H

/* Indicate R2 ISA level support.  */
#define TARGET_ARCH_R2 (nios2_arch_option == ARCH_R2)

/* FPU insn codes declared here.  */
#include "config/nios2/nios2-opts.h"

/* Define built-in preprocessor macros.  */
#define TARGET_CPU_CPP_BUILTINS()                   \
  do                                                \
    {                                               \
      builtin_define_std ("NIOS2");                 \
      builtin_define_std ("nios2");                 \
      if (TARGET_BIG_ENDIAN)                        \
        builtin_define_std ("nios2_big_endian");    \
      else                                          \
        builtin_define_std ("nios2_little_endian"); \
      builtin_define_with_int_value (		    \
        "__nios2_arch__", (int) nios2_arch_option); \
    }						    \
  while (0)

/* We're little endian, unless otherwise specified by defining
   BIG_ENDIAN_FLAG.  */
#ifndef TARGET_ENDIAN_DEFAULT
# define TARGET_ENDIAN_DEFAULT 0
#endif

/* Default target_flags if no switches specified.  */
#ifndef TARGET_DEFAULT
# define TARGET_DEFAULT (MASK_HAS_MUL | TARGET_ENDIAN_DEFAULT)
#endif

#define OPTION_DEFAULT_SPECS \
  {"arch", "%{!march=*:%{!mcpu=*:-march=%(VALUE)}}" }

#define CC1_SPEC "%{G*}"

#if TARGET_ENDIAN_DEFAULT == 0
# define ASM_SPEC "%{!meb:-EL} %{meb:-EB} %{march=*:-march=%*}"
# define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}"
# define MULTILIB_DEFAULTS { "EL" }
#else
# define ASM_SPEC "%{!mel:-EB} %{mel:-EL} %{march=*:-march=%*}"
# define LINK_SPEC_ENDIAN "%{!mel:-EB} %{mel:-EL}"
# define MULTILIB_DEFAULTS { "EB" }
#endif

#define LINK_SPEC LINK_SPEC_ENDIAN \
  " %{shared:-shared} \
    %{static:-Bstatic}"


/* Storage layout.  */

#define DEFAULT_SIGNED_CHAR 1
#define BITS_BIG_ENDIAN 0
#define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
#define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
#define BITS_PER_WORD 32
#define UNITS_PER_WORD 4
#define POINTER_SIZE 32
#define BIGGEST_ALIGNMENT 32
#define STRICT_ALIGNMENT 1
#define FUNCTION_BOUNDARY 32
#define PARM_BOUNDARY 32
#define STACK_BOUNDARY 32
#define PREFERRED_STACK_BOUNDARY 32
#define MAX_FIXED_MODE_SIZE 64

#define LABEL_ALIGN(LABEL) nios2_label_align (LABEL)

/* Layout of source language data types.  */

#define INT_TYPE_SIZE 32
#define SHORT_TYPE_SIZE 16
#define LONG_TYPE_SIZE 32
#define LONG_LONG_TYPE_SIZE 64
#define FLOAT_TYPE_SIZE 32
#define DOUBLE_TYPE_SIZE 64
#define LONG_DOUBLE_TYPE_SIZE DOUBLE_TYPE_SIZE

#undef SIZE_TYPE
#define SIZE_TYPE "unsigned int"

#undef PTRDIFF_TYPE
#define PTRDIFF_TYPE "int"


/* Basic characteristics of Nios II registers:

   Regno  Name
   0      r0       zero    always zero
   1      r1       at      Assembler Temporary
   2-3    r2-r3            Return Location
   4-7    r4-r7            Register Arguments
   8-15   r8-r15           Caller Saved Registers
   16-22  r16-r22          Callee Saved Registers
   22     r22              Global Offset Table pointer (Linux ABI only)
   23     r23              Thread pointer (Linux ABI only)
   24     r24      et      Exception Temporary
   25     r25      bt      Breakpoint Temporary
   26     r26      gp      Global Pointer
   27     r27      sp      Stack Pointer
   28     r28      fp      Frame Pointer
   29     r29      ea      Exception Return Address
   30     r30      ba      Breakpoint Return Address
   31     r31      ra      Return Address
			   
   32     ctl0     status
   33     ctl1     estatus STATUS saved by exception
   34     ctl2     bstatus STATUS saved by break
   35     ctl3     ipri    Interrupt Priority Mask
   36     ctl4     ecause  Exception Cause

   37     pc               Not an actual register

   38     fake_fp          Fake Frame Pointer (always eliminated)
   39     fake_ap          Fake Argument Pointer (always eliminated)
   40                      First Pseudo Register

   In addition, r12 is used as the static chain register and r13, r14, and r15
   are clobbered by PLT code sequences.  

   The definitions for all the hard register numbers are located in nios2.md.
*/

#define FIXED_REGISTERS                      \
  {					     \
/*        +0  1  2  3  4  5  6  7  8  9 */   \
/*   0 */  1, 1, 0, 0, 0, 0, 0, 0, 0, 0,     \
/*  10 */  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,     \
/*  20 */  0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1,     \
/*  30 */  1, 0, 1, 1, 1, 1, 1, 1, 1, 1,     \
  }

/* Call used == caller saved + fixed regs + args + ret vals.  */
#define CALL_USED_REGISTERS                  \
  {					     \
/*        +0  1  2  3  4  5  6  7  8  9 */   \
/*   0 */  1, 1, 1, 1, 1, 1, 1, 1, 1, 1,     \
/*  10 */  1, 1, 1, 1, 1, 1, 0, 0, 0, 0,     \
/*  20 */  0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1,     \
/*  30 */  1, 1, 1, 1, 1, 1, 1, 1, 1, 1,     \
  }

/* Order in which to allocate registers.  Each register must be
   listed once.  This is the default ordering for R1 and non-CDX R2
   code.  For CDX, we overwrite this in ADJUST_REG_ALLOC_ORDER.  */
#define REG_ALLOC_ORDER							\
  { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \
      20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, \
      37, 38, 39 }

#define ADJUST_REG_ALLOC_ORDER nios2_adjust_reg_alloc_order ()

/* Caller-save costs can be less emphasized under R2 CDX, where we can
   use push.n/pop.n.  */
#define HONOR_REG_ALLOC_ORDER (TARGET_HAS_CDX)

/* Register Classes.  */

enum reg_class
{
  NO_REGS,
  SIB_REGS,
  IJMP_REGS,
  GP_REGS,
  ALL_REGS,
  LIM_REG_CLASSES
};

#define N_REG_CLASSES (int) LIM_REG_CLASSES

#define REG_CLASS_NAMES   \
  {  "NO_REGS",		  \
     "SIB_REGS",	  \
     "IJMP_REGS",	  \
     "GP_REGS",           \
     "ALL_REGS" }

#define GENERAL_REGS ALL_REGS

#define REG_CLASS_CONTENTS			\
  {						\
    /* NO_REGS    */ { 0, 0},			\
    /* SIB_REGS   */ { 0xfe0c, 0},		\
    /* IJMP_REGS  */ { 0x7fffffff, 0},		\
    /* GP_REGS    */ {~0, 0},			\
    /* ALL_REGS   */ {~0,~0}			\
  }


#define GP_REG_P(REGNO) ((unsigned)(REGNO) <= LAST_GP_REG)
#define REGNO_REG_CLASS(REGNO) (GP_REG_P (REGNO) ? GP_REGS : ALL_REGS)
#define CLASS_MAX_NREGS(CLASS, MODE)					\
  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

#define CDX_REG_P(REGNO)						\
  ((REGNO) == 16 || (REGNO) == 17 || ((REGNO) >= 2 && (REGNO) <= 7))

/* Tests for various kinds of constants used in the Nios II port.  */

#define SMALL_INT(X) ((unsigned HOST_WIDE_INT)(X) + 0x8000 < 0x10000)
#define SMALL_INT12(X) ((unsigned HOST_WIDE_INT)(X) + 0x800 < 0x1000)
#define SMALL_INT_UNSIGNED(X) ((X) >= 0 && (X) < 0x10000)
#define UPPER16_INT(X) (((X) & 0xffff) == 0)
#define SHIFT_INT(X) ((X) >= 0 && (X) <= 31)
#define RDWRCTL_INT(X) ((X) >= 0 && (X) <= 31)
#define CUSTOM_INSN_OPCODE(X) ((X) >= 0 && (X) <= 255)
#define ANDCLEAR_INT(X) \
  (((X) & 0xffff) == 0xffff || (((X) >> 16) & 0xffff) == 0xffff)

/* Say that the epilogue uses the return address register.  Note that
   in the case of sibcalls, the values "used by the epilogue" are
   considered live at the start of the called function.  */
#define EPILOGUE_USES(REGNO) (epilogue_completed && (REGNO) == RA_REGNO)

/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
   the stack pointer does not matter.  The value is tested only in
   functions that have frame pointers.
   No definition is equivalent to always zero.  */

#define EXIT_IGNORE_STACK 1

/* Trampolines use a 5-instruction sequence.  */
#define TRAMPOLINE_SIZE 20

/* Stack layout.  */
#define STACK_GROWS_DOWNWARD 1
#define FRAME_GROWS_DOWNWARD 1
#define FIRST_PARM_OFFSET(FUNDECL) 0

/* Before the prologue, RA lives in r31.  */
#define INCOMING_RETURN_ADDR_RTX  gen_rtx_REG (Pmode, RA_REGNO)
#define RETURN_ADDR_RTX(C,F) nios2_get_return_address (C)

#define DWARF_FRAME_RETURN_COLUMN RA_REGNO

/* The CFA includes the pretend args.  */
#define ARG_POINTER_CFA_OFFSET(FNDECL) \
  (gcc_assert ((FNDECL) == current_function_decl), \
   FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)

/* Frame/arg pointer elimination settings.  */
#define ELIMINABLE_REGS                                                 \
{{ ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
 { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM},                    \
 { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},                         \
 { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}

#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
  (OFFSET) = nios2_initial_elimination_offset ((FROM), (TO))

/* Calling convention definitions.  */
typedef struct nios2_args
{
  int regs_used;
} CUMULATIVE_ARGS;

#define NUM_ARG_REGS (LAST_ARG_REGNO - FIRST_ARG_REGNO + 1)

#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
  do { (CUM).regs_used = 0; } while (0)

#define PAD_VARARGS_DOWN \
  (targetm.calls.function_arg_padding (TYPE_MODE (type), type) == PAD_DOWNWARD)

#define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
  (nios2_block_reg_padding ((MODE), (TYPE), (FIRST)))

#define FUNCTION_ARG_REGNO_P(REGNO) \
  ((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO)

/* Passing function arguments on stack.  */
#define ACCUMULATE_OUTGOING_ARGS 1

/* We define TARGET_RETURN_IN_MEMORY, so set to zero.  */
#define DEFAULT_PCC_STRUCT_RETURN 0

/* Profiling.  */
#define PROFILE_BEFORE_PROLOGUE
#define NO_PROFILE_COUNTERS 1
#define FUNCTION_PROFILER(FILE, LABELNO) \
  nios2_function_profiler ((FILE), (LABELNO))

/* Addressing modes.  */

#define CONSTANT_ADDRESS_P(X) \
  (CONSTANT_P (X) && memory_address_p (SImode, X))

#define MAX_REGS_PER_ADDRESS 1
#define BASE_REG_CLASS ALL_REGS
#define INDEX_REG_CLASS NO_REGS

#define REGNO_OK_FOR_BASE_P(REGNO) nios2_regno_ok_for_base_p ((REGNO), true)
#define REGNO_OK_FOR_INDEX_P(REGNO) 0

/* Describing Relative Costs of Operations.  */
#define MOVE_MAX 4
#define SLOW_BYTE_ACCESS 1

/* It is as good to call a constant function address as to call an address
   kept in a register.  */
#define NO_FUNCTION_CSE 1

/* Position independent code.  */

#define PIC_OFFSET_TABLE_REGNUM 22
#define LEGITIMATE_PIC_OPERAND_P(X) nios2_legitimate_pic_operand_p (X)

/* Define output assembler language.  */

#define ASM_APP_ON "#APP\n"
#define ASM_APP_OFF "#NO_APP\n"

#define ASM_COMMENT_START "# "

#define GLOBAL_ASM_OP "\t.global\t"

#define REGISTER_NAMES \
  {		       \
    "zero", \
    "at", \
    "r2", \
    "r3", \
    "r4", \
    "r5", \
    "r6", \
    "r7", \
    "r8", \
    "r9", \
    "r10", \
    "r11", \
    "r12", \
    "r13", \
    "r14", \
    "r15", \
    "r16", \
    "r17", \
    "r18", \
    "r19", \
    "r20", \
    "r21", \
    "r22", \
    "r23", \
    "et", \
    "bt", \
    "gp", \
    "sp", \
    "fp", \
    "ta", \
    "ba", \
    "ra", \
    "status", \
    "estatus", \
    "bstatus", \
    "ipri", \
    "ecause", \
    "pc", \
    "fake_fp", \
    "fake_ap", \
}

#define ADDITIONAL_REGISTER_NAMES       \
{					\
  {"r0", 0},				\
  {"r1", 1},				\
  {"r24", 24},                          \
  {"r25", 25},                          \
  {"r26", 26},                          \
  {"r27", 27},                          \
  {"r28", 28},                          \
  {"r29", 29},                          \
  {"r30", 30},                          \
  {"r31", 31}                           \
}

#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  do									\
    {									\
      fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
      fprintf (FILE, ".L%u\n", (unsigned) (VALUE));			\
    }									\
  while (0)

#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)\
  do									\
    {									\
      fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), STREAM); \
      fprintf (STREAM, ".L%u-.L%u\n", (unsigned) (VALUE), (unsigned) (REL)); \
    }									\
  while (0)

/* Section directives.  */

/* Output before read-only data.  */
#define TEXT_SECTION_ASM_OP "\t.section\t.text"

/* Output before writable data.  */
#define DATA_SECTION_ASM_OP "\t.section\t.data"

/* Output before uninitialized data.  */
#define BSS_SECTION_ASM_OP "\t.section\t.bss"

/* Output before 'small' uninitialized data.  */
#define SBSS_SECTION_ASM_OP "\t.section\t.sbss"

#ifndef USED_FOR_TARGET
/* Default the definition of "small data" to 8 bytes.  */
extern unsigned HOST_WIDE_INT nios2_section_threshold;
#endif

#define NIOS2_DEFAULT_GVALUE 8

/* This says how to output assembler code to declare an
   uninitialized external linkage data object.  Under SVR4,
   the linker seems to want the alignment of data objects
   to depend on their types.  We do exactly that here.  */
#undef COMMON_ASM_OP
#define COMMON_ASM_OP   "\t.comm\t"

#define ASM_OUTPUT_ALIGN(FILE, LOG)		     \
  do {						     \
    fprintf ((FILE), "%s%d\n", ALIGN_ASM_OP, (LOG)); \
  } while (0)

#undef  ASM_OUTPUT_ALIGNED_COMMON
#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
do                                                                      \
  {									\
    fprintf ((FILE), "%s", COMMON_ASM_OP);				\
    assemble_name ((FILE), (NAME));					\
    fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE),	\
	     (ALIGN) / BITS_PER_UNIT);					\
  }									\
while (0)


/* This says how to output assembler code to declare an
   uninitialized internal linkage data object.  Under SVR4,
   the linker seems to want the alignment of data objects
   to depend on their types.  We do exactly that here.  */

#undef  ASM_OUTPUT_ALIGNED_DECL_LOCAL
#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN)	\
do {                                                                    \
 if (targetm.in_small_data_p (DECL))					\
    switch_to_section (sbss_section);					\
  else                                                                  \
    switch_to_section (bss_section);					\
  ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");                     \
  if (!flag_inhibit_size_directive)                                     \
    ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE);                       \
  ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT));       \
  ASM_OUTPUT_LABEL(FILE, NAME);                                         \
  ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1);                         \
} while (0)

/* Put the jump tables in .text because when using position-independent code,
   Nios II elf has no relocation that can represent arbitrary differences
   between symbols in different sections.  */
#define JUMP_TABLES_IN_TEXT_SECTION 1

/* Exception handling.  */

/* Describe __builtin_eh_return.  */
#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, LAST_RETVAL_REGNO)
#define EH_RETURN_DATA_REGNO(N) ((N) <= (LAST_ARG_REGNO - FIRST_ARG_REGNO) \
				 ? (N) + FIRST_ARG_REGNO : INVALID_REGNUM)

/* For PIC, use indirect for global references; it'll end up using a dynamic
   relocation, which we want to keep out of read-only EH sections.
   For local references, we want to use GOT-relative offsets provided
   the assembler supports them.  For non-PIC, use an absolute encoding.  */
#ifdef HAVE_AS_NIOS2_GOTOFF_RELOCATION
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)		\
  (flag_pic							\
   ? ((GLOBAL)							\
      ? DW_EH_PE_indirect | DW_EH_PE_absptr			\
      : DW_EH_PE_datarel | DW_EH_PE_sdata4)			\
   : DW_EH_PE_absptr)

#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
  do {									\
      if (((ENCODING) & 0xf0) == DW_EH_PE_datarel)			\
      {									\
	fputs ("\t.4byte %gotoff(", FILE);				\
	output_addr_const (FILE, ADDR);					\
	fputs (")", FILE);						\
	goto DONE;							\
      }									\
  } while (0)

#else
/* We don't have %gotoff support in the assembler.  Fall back to the encoding
   it used to use instead before the assembler was fixed.  This has known
   bugs but mostly works.  */
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)		\
  (flag_pic							\
   ? ((GLOBAL)							\
      ? DW_EH_PE_indirect | DW_EH_PE_absptr			\
      : DW_EH_PE_aligned)					\
   : DW_EH_PE_absptr)
#endif

/* Misc. parameters.  */

#define STORE_FLAG_VALUE 1
#define Pmode SImode
#define FUNCTION_MODE QImode

#define CASE_VECTOR_MODE Pmode

#define LOAD_EXTEND_OP(MODE) (ZERO_EXTEND)

#define WORD_REGISTER_OPERATIONS 1

#endif /* GCC_NIOS2_H */
Commit	Line	Data
e430824f	1	/* Definitions of target machine for Altera Nios II.
a945c346	2	Copyright (C) 2012-2024 Free Software Foundation, Inc.
e430824f CLT	3	Contributed by Jonah Graham (jgraham@altera.com),
	4	Will Reece (wreece@altera.com), and Jeff DaSilva (jdasilva@altera.com).
	5	Contributed by Mentor Graphics, Inc.
	6
	7	This file is part of GCC.
	8
	9	GCC is free software; you can redistribute it and/or modify it
	10	under the terms of the GNU General Public License as published
	11	by the Free Software Foundation; either version 3, or (at your
	12	option) any later version.
	13
	14	GCC is distributed in the hope that it will be useful, but WITHOUT
	15	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	16	or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
	17	License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with GCC; see the file COPYING3. If not see
	21	<http://www.gnu.org/licenses/>. */
	22
	23	#ifndef GCC_NIOS2_H
	24	#define GCC_NIOS2_H
	25
77c50d73 SL	26	/* Indicate R2 ISA level support. */
	27	#define TARGET_ARCH_R2 (nios2_arch_option == ARCH_R2)
	28
e430824f CLT	29	/* FPU insn codes declared here. */
	30	#include "config/nios2/nios2-opts.h"
	31
	32	/* Define built-in preprocessor macros. */
	33	#define TARGET_CPU_CPP_BUILTINS() \
	34	do \
	35	{ \
	36	builtin_define_std ("NIOS2"); \
	37	builtin_define_std ("nios2"); \
	38	if (TARGET_BIG_ENDIAN) \
	39	builtin_define_std ("nios2_big_endian"); \
	40	else \
	41	builtin_define_std ("nios2_little_endian"); \
77c50d73 SL	42	builtin_define_with_int_value ( \
	43	"__nios2_arch__", (int) nios2_arch_option); \
	44	} \
e430824f CLT	45	while (0)
	46
	47	/* We're little endian, unless otherwise specified by defining
	48	BIG_ENDIAN_FLAG. */
	49	#ifndef TARGET_ENDIAN_DEFAULT
	50	# define TARGET_ENDIAN_DEFAULT 0
	51	#endif
	52
	53	/* Default target_flags if no switches specified. */
	54	#ifndef TARGET_DEFAULT
	55	# define TARGET_DEFAULT (MASK_HAS_MUL \| TARGET_ENDIAN_DEFAULT)
	56	#endif
	57
77c50d73 SL	58	#define OPTION_DEFAULT_SPECS \
	59	{"arch", "%{!march=:%{!mcpu=:-march=%(VALUE)}}" }
	60
e430824f CLT	61	#define CC1_SPEC "%{G*}"
	62
	63	#if TARGET_ENDIAN_DEFAULT == 0
77c50d73	64	# define ASM_SPEC "%{!meb:-EL} %{meb:-EB} %{march=:-march=%}"
e430824f CLT	65	# define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}"
	66	# define MULTILIB_DEFAULTS { "EL" }
	67	#else
77c50d73	68	# define ASM_SPEC "%{!mel:-EB} %{mel:-EL} %{march=:-march=%}"
e430824f CLT	69	# define LINK_SPEC_ENDIAN "%{!mel:-EB} %{mel:-EL}"
	70	# define MULTILIB_DEFAULTS { "EB" }
	71	#endif
	72
	73	#define LINK_SPEC LINK_SPEC_ENDIAN \
	74	" %{shared:-shared} \
	75	%{static:-Bstatic}"
	76
	77
	78	/* Storage layout. */
	79
	80	#define DEFAULT_SIGNED_CHAR 1
	81	#define BITS_BIG_ENDIAN 0
	82	#define BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
	83	#define WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN != 0)
e430824f CLT	84	#define BITS_PER_WORD 32
	85	#define UNITS_PER_WORD 4
	86	#define POINTER_SIZE 32
	87	#define BIGGEST_ALIGNMENT 32
	88	#define STRICT_ALIGNMENT 1
	89	#define FUNCTION_BOUNDARY 32
	90	#define PARM_BOUNDARY 32
	91	#define STACK_BOUNDARY 32
	92	#define PREFERRED_STACK_BOUNDARY 32
	93	#define MAX_FIXED_MODE_SIZE 64
	94
3bbbe009 SL	95	#define LABEL_ALIGN(LABEL) nios2_label_align (LABEL)
3bbbe009 SL	96
e430824f CLT	97	/* Layout of source language data types. */
	98
	99	#define INT_TYPE_SIZE 32
	100	#define SHORT_TYPE_SIZE 16
	101	#define LONG_TYPE_SIZE 32
	102	#define LONG_LONG_TYPE_SIZE 64
	103	#define FLOAT_TYPE_SIZE 32
	104	#define DOUBLE_TYPE_SIZE 64
	105	#define LONG_DOUBLE_TYPE_SIZE DOUBLE_TYPE_SIZE
	106
	107	#undef SIZE_TYPE
	108	#define SIZE_TYPE "unsigned int"
	109
	110	#undef PTRDIFF_TYPE
	111	#define PTRDIFF_TYPE "int"
	112
	113
	114	/* Basic characteristics of Nios II registers:
	115
	116	Regno Name
	117	0 r0 zero always zero
	118	1 r1 at Assembler Temporary
	119	2-3 r2-r3 Return Location
	120	4-7 r4-r7 Register Arguments
	121	8-15 r8-r15 Caller Saved Registers
	122	16-22 r16-r22 Callee Saved Registers
	123	22 r22 Global Offset Table pointer (Linux ABI only)
	124	23 r23 Thread pointer (Linux ABI only)
	125	24 r24 et Exception Temporary
	126	25 r25 bt Breakpoint Temporary
	127	26 r26 gp Global Pointer
	128	27 r27 sp Stack Pointer
	129	28 r28 fp Frame Pointer
	130	29 r29 ea Exception Return Address
	131	30 r30 ba Breakpoint Return Address
	132	31 r31 ra Return Address
	133
	134	32 ctl0 status
	135	33 ctl1 estatus STATUS saved by exception
	136	34 ctl2 bstatus STATUS saved by break
	137	35 ctl3 ipri Interrupt Priority Mask
	138	36 ctl4 ecause Exception Cause
	139
	140	37 pc Not an actual register
	141
	142	38 fake_fp Fake Frame Pointer (always eliminated)
	143	39 fake_ap Fake Argument Pointer (always eliminated)
	144	40 First Pseudo Register
	145
	146	In addition, r12 is used as the static chain register and r13, r14, and r15
	147	are clobbered by PLT code sequences.
	148
	149	The definitions for all the hard register numbers are located in nios2.md.
	150	*/
	151
	152	#define FIXED_REGISTERS \
	153	{ \
	154	/* +0 1 2 3 4 5 6 7 8 9 */ \
	155	/* 0 */ 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, \
	156	/* 10 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
	157	/* 20 */ 0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1, \
	158	/* 30 */ 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, \
	159	}
	160
161	/* Call used == caller saved + fixed regs + args + ret vals. */
162	#define CALL_USED_REGISTERS \
163	{ \
164	/* +0 1 2 3 4 5 6 7 8 9 */ \
165	/* 0 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
166	/* 10 */ 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, \
167	/* 20 */ 0, 0, TARGET_LINUX_ABI, TARGET_LINUX_ABI, 1, 1, 1, 1, 0, 1, \
168	/* 30 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
169	}
170
3bbbe009 SL	171	/* Order in which to allocate registers. Each register must be
	172	listed once. This is the default ordering for R1 and non-CDX R2
	173	code. For CDX, we overwrite this in ADJUST_REG_ALLOC_ORDER. */
	174	#define REG_ALLOC_ORDER \
	175	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, \
	176	20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, \
	177	37, 38, 39 }
	178
	179	#define ADJUST_REG_ALLOC_ORDER nios2_adjust_reg_alloc_order ()
	180
	181	/* Caller-save costs can be less emphasized under R2 CDX, where we can
	182	use push.n/pop.n. */
	183	#define HONOR_REG_ALLOC_ORDER (TARGET_HAS_CDX)
	184
e430824f CLT	185	/* Register Classes. */
	186
	187	enum reg_class
	188	{
	189	NO_REGS,
	190	SIB_REGS,
3c8c9f0d	191	IJMP_REGS,
e430824f CLT	192	GP_REGS,
	193	ALL_REGS,
	194	LIM_REG_CLASSES
	195	};
	196
	197	#define N_REG_CLASSES (int) LIM_REG_CLASSES
	198
	199	#define REG_CLASS_NAMES \
	200	{ "NO_REGS", \
	201	"SIB_REGS", \
3c8c9f0d	202	"IJMP_REGS", \
e430824f CLT	203	"GP_REGS", \
	204	"ALL_REGS" }
	205
	206	#define GENERAL_REGS ALL_REGS
	207
	208	#define REG_CLASS_CONTENTS \
	209	{ \
3c8c9f0d CLT	210	/* NO_REGS */ { 0, 0}, \
	211	/* SIB_REGS */ { 0xfe0c, 0}, \
	212	/* IJMP_REGS */ { 0x7fffffff, 0}, \
	213	/* GP_REGS */ {~0, 0}, \
	214	/* ALL_REGS */ {~0,~0} \
e430824f CLT	215	}
	216
	217
	218	#define GP_REG_P(REGNO) ((unsigned)(REGNO) <= LAST_GP_REG)
	219	#define REGNO_REG_CLASS(REGNO) (GP_REG_P (REGNO) ? GP_REGS : ALL_REGS)
	220	#define CLASS_MAX_NREGS(CLASS, MODE) \
	221	((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
	222
3bbbe009	223	#define CDX_REG_P(REGNO) \
01512446	224	((REGNO) == 16 \|\| (REGNO) == 17 \|\| ((REGNO) >= 2 && (REGNO) <= 7))
3bbbe009	225
e430824f CLT	226	/* Tests for various kinds of constants used in the Nios II port. */
	227
	228	#define SMALL_INT(X) ((unsigned HOST_WIDE_INT)(X) + 0x8000 < 0x10000)
42e6ab74	229	#define SMALL_INT12(X) ((unsigned HOST_WIDE_INT)(X) + 0x800 < 0x1000)
e430824f CLT	230	#define SMALL_INT_UNSIGNED(X) ((X) >= 0 && (X) < 0x10000)
	231	#define UPPER16_INT(X) (((X) & 0xffff) == 0)
	232	#define SHIFT_INT(X) ((X) >= 0 && (X) <= 31)
	233	#define RDWRCTL_INT(X) ((X) >= 0 && (X) <= 31)
	234	#define CUSTOM_INSN_OPCODE(X) ((X) >= 0 && (X) <= 255)
3bbbe009 SL	235	#define ANDCLEAR_INT(X) \
3bbbe009 SL	236	(((X) & 0xffff) == 0xffff \|\| (((X) >> 16) & 0xffff) == 0xffff)
e430824f CLT	237
	238	/* Say that the epilogue uses the return address register. Note that
	239	in the case of sibcalls, the values "used by the epilogue" are
	240	considered live at the start of the called function. */
	241	#define EPILOGUE_USES(REGNO) (epilogue_completed && (REGNO) == RA_REGNO)
	242
	243	/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
	244	the stack pointer does not matter. The value is tested only in
	245	functions that have frame pointers.
	246	No definition is equivalent to always zero. */
	247
	248	#define EXIT_IGNORE_STACK 1
	249
	250	/* Trampolines use a 5-instruction sequence. */
	251	#define TRAMPOLINE_SIZE 20
	252
	253	/* Stack layout. */
62f9f30b	254	#define STACK_GROWS_DOWNWARD 1
9bba3b25	255	#define FRAME_GROWS_DOWNWARD 1
e430824f CLT	256	#define FIRST_PARM_OFFSET(FUNDECL) 0
	257
	258	/* Before the prologue, RA lives in r31. */
240930c4	259	#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, RA_REGNO)
e430824f CLT	260	#define RETURN_ADDR_RTX(C,F) nios2_get_return_address (C)
	261
	262	#define DWARF_FRAME_RETURN_COLUMN RA_REGNO
	263
	264	/* The CFA includes the pretend args. */
	265	#define ARG_POINTER_CFA_OFFSET(FNDECL) \
	266	(gcc_assert ((FNDECL) == current_function_decl), \
	267	FIRST_PARM_OFFSET (FNDECL) + crtl->args.pretend_args_size)
	268
	269	/* Frame/arg pointer elimination settings. */
	270	#define ELIMINABLE_REGS \
	271	{{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
	272	{ ARG_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}, \
	273	{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
	274	{ FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}
	275
	276	#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
	277	(OFFSET) = nios2_initial_elimination_offset ((FROM), (TO))
	278
	279	/* Calling convention definitions. */
	280	typedef struct nios2_args
	281	{
	282	int regs_used;
	283	} CUMULATIVE_ARGS;
	284
	285	#define NUM_ARG_REGS (LAST_ARG_REGNO - FIRST_ARG_REGNO + 1)
	286
	287	#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, FNDECL, N_NAMED_ARGS) \
	288	do { (CUM).regs_used = 0; } while (0)
	289
e430824f	290	#define PAD_VARARGS_DOWN \
76b0cbf8	291	(targetm.calls.function_arg_padding (TYPE_MODE (type), type) == PAD_DOWNWARD)
e430824f CLT	292
	293	#define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
	294	(nios2_block_reg_padding ((MODE), (TYPE), (FIRST)))
	295
	296	#define FUNCTION_ARG_REGNO_P(REGNO) \
	297	((REGNO) >= FIRST_ARG_REGNO && (REGNO) <= LAST_ARG_REGNO)
	298
	299	/* Passing function arguments on stack. */
e430824f CLT	300	#define ACCUMULATE_OUTGOING_ARGS 1
	301
	302	/* We define TARGET_RETURN_IN_MEMORY, so set to zero. */
	303	#define DEFAULT_PCC_STRUCT_RETURN 0
	304
	305	/* Profiling. */
	306	#define PROFILE_BEFORE_PROLOGUE
	307	#define NO_PROFILE_COUNTERS 1
	308	#define FUNCTION_PROFILER(FILE, LABELNO) \
	309	nios2_function_profiler ((FILE), (LABELNO))
	310
	311	/* Addressing modes. */
	312
	313	#define CONSTANT_ADDRESS_P(X) \
	314	(CONSTANT_P (X) && memory_address_p (SImode, X))
	315
	316	#define MAX_REGS_PER_ADDRESS 1
	317	#define BASE_REG_CLASS ALL_REGS
	318	#define INDEX_REG_CLASS NO_REGS
	319
	320	#define REGNO_OK_FOR_BASE_P(REGNO) nios2_regno_ok_for_base_p ((REGNO), true)
	321	#define REGNO_OK_FOR_INDEX_P(REGNO) 0
	322
	323	/* Describing Relative Costs of Operations. */
	324	#define MOVE_MAX 4
	325	#define SLOW_BYTE_ACCESS 1
	326
	327	/* It is as good to call a constant function address as to call an address
	328	kept in a register. */
1e8552c2	329	#define NO_FUNCTION_CSE 1
e430824f CLT	330
	331	/* Position independent code. */
	332
	333	#define PIC_OFFSET_TABLE_REGNUM 22
	334	#define LEGITIMATE_PIC_OPERAND_P(X) nios2_legitimate_pic_operand_p (X)
	335
	336	/* Define output assembler language. */
	337
	338	#define ASM_APP_ON "#APP\n"
	339	#define ASM_APP_OFF "#NO_APP\n"
	340
	341	#define ASM_COMMENT_START "# "
	342
	343	#define GLOBAL_ASM_OP "\t.global\t"
	344
	345	#define REGISTER_NAMES \
	346	{ \
	347	"zero", \
	348	"at", \
	349	"r2", \
	350	"r3", \
	351	"r4", \
	352	"r5", \
	353	"r6", \
	354	"r7", \
	355	"r8", \
	356	"r9", \
	357	"r10", \
	358	"r11", \
	359	"r12", \
	360	"r13", \
	361	"r14", \
	362	"r15", \
	363	"r16", \
	364	"r17", \
	365	"r18", \
	366	"r19", \
	367	"r20", \
	368	"r21", \
	369	"r22", \
	370	"r23", \
	371	"et", \
	372	"bt", \
	373	"gp", \
	374	"sp", \
	375	"fp", \
	376	"ta", \
	377	"ba", \
	378	"ra", \
	379	"status", \
	380	"estatus", \
	381	"bstatus", \
	382	"ipri", \
	383	"ecause", \
	384	"pc", \
	385	"fake_fp", \
	386	"fake_ap", \
	387	}
	388
	389	#define ADDITIONAL_REGISTER_NAMES \
	390	{ \
	391	{"r0", 0}, \
	392	{"r1", 1}, \
	393	{"r24", 24}, \
394	{"r25", 25}, \
395	{"r26", 26}, \
396	{"r27", 27}, \
397	{"r28", 28}, \
398	{"r29", 29}, \
399	{"r30", 30}, \
400	{"r31", 31} \
401	}
402
403	#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
404	do \
405	{ \
406	fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
407	fprintf (FILE, ".L%u\n", (unsigned) (VALUE)); \
408	} \
409	while (0)
410
411	#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)\
412	do \
413	{ \
414	fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), STREAM); \
415	fprintf (STREAM, ".L%u-.L%u\n", (unsigned) (VALUE), (unsigned) (REL)); \
416	} \
417	while (0)
418
419	/* Section directives. */
420
421	/* Output before read-only data. */
422	#define TEXT_SECTION_ASM_OP "\t.section\t.text"
423
424	/* Output before writable data. */
425	#define DATA_SECTION_ASM_OP "\t.section\t.data"
426
427	/* Output before uninitialized data. */
428	#define BSS_SECTION_ASM_OP "\t.section\t.bss"
429
430	/* Output before 'small' uninitialized data. */
431	#define SBSS_SECTION_ASM_OP "\t.section\t.sbss"
432
05122129	433	#ifndef USED_FOR_TARGET
e430824f CLT	434	/* Default the definition of "small data" to 8 bytes. */
	435	extern unsigned HOST_WIDE_INT nios2_section_threshold;
	436	#endif
	437
	438	#define NIOS2_DEFAULT_GVALUE 8
	439
	440	/* This says how to output assembler code to declare an
	441	uninitialized external linkage data object. Under SVR4,
	442	the linker seems to want the alignment of data objects
	443	to depend on their types. We do exactly that here. */
	444	#undef COMMON_ASM_OP
	445	#define COMMON_ASM_OP "\t.comm\t"
	446
	447	#define ASM_OUTPUT_ALIGN(FILE, LOG) \
	448	do { \
	449	fprintf ((FILE), "%s%d\n", ALIGN_ASM_OP, (LOG)); \
	450	} while (0)
	451
	452	#undef ASM_OUTPUT_ALIGNED_COMMON
	453	#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
	454	do \
	455	{ \
	456	fprintf ((FILE), "%s", COMMON_ASM_OP); \
	457	assemble_name ((FILE), (NAME)); \
16998094	458	fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \
e430824f CLT	459	(ALIGN) / BITS_PER_UNIT); \
	460	} \
	461	while (0)
	462
	463
	464	/* This says how to output assembler code to declare an
	465	uninitialized internal linkage data object. Under SVR4,
	466	the linker seems to want the alignment of data objects
	467	to depend on their types. We do exactly that here. */
	468
4569f8b3 SL	469	#undef ASM_OUTPUT_ALIGNED_DECL_LOCAL
4569f8b3 SL	470	#define ASM_OUTPUT_ALIGNED_DECL_LOCAL(FILE, DECL, NAME, SIZE, ALIGN) \
e430824f	471	do { \
4569f8b3	472	if (targetm.in_small_data_p (DECL)) \
e430824f CLT	473	switch_to_section (sbss_section); \
	474	else \
	475	switch_to_section (bss_section); \
	476	ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
	477	if (!flag_inhibit_size_directive) \
	478	ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \
	479	ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \
	480	ASM_OUTPUT_LABEL(FILE, NAME); \
	481	ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \
	482	} while (0)
	483
	484	/* Put the jump tables in .text because when using position-independent code,
	485	Nios II elf has no relocation that can represent arbitrary differences
	486	between symbols in different sections. */
	487	#define JUMP_TABLES_IN_TEXT_SECTION 1
	488
	489	/* Exception handling. */
	490
	491	/* Describe __builtin_eh_return. */
	492	#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, LAST_RETVAL_REGNO)
	493	#define EH_RETURN_DATA_REGNO(N) ((N) <= (LAST_ARG_REGNO - FIRST_ARG_REGNO) \
	494	? (N) + FIRST_ARG_REGNO : INVALID_REGNUM)
	495
2d33dcfe SL	496	/* For PIC, use indirect for global references; it'll end up using a dynamic
	497	relocation, which we want to keep out of read-only EH sections.
	498	For local references, we want to use GOT-relative offsets provided
	499	the assembler supports them. For non-PIC, use an absolute encoding. */
	500	#ifdef HAVE_AS_NIOS2_GOTOFF_RELOCATION
e430824f	501	#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
2d33dcfe SL	502	(flag_pic \
	503	? ((GLOBAL) \
	504	? DW_EH_PE_indirect \| DW_EH_PE_absptr \
	505	: DW_EH_PE_datarel \| DW_EH_PE_sdata4) \
	506	: DW_EH_PE_absptr)
	507
	508	#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE) \
	509	do { \
	510	if (((ENCODING) & 0xf0) == DW_EH_PE_datarel) \
	511	{ \
	512	fputs ("\t.4byte %gotoff(", FILE); \
	513	output_addr_const (FILE, ADDR); \
	514	fputs (")", FILE); \
	515	goto DONE; \
	516	} \
	517	} while (0)
	518
	519	#else
	520	/* We don't have %gotoff support in the assembler. Fall back to the encoding
	521	it used to use instead before the assembler was fixed. This has known
	522	bugs but mostly works. */
	523	#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
	524	(flag_pic \
	525	? ((GLOBAL) \
	526	? DW_EH_PE_indirect \| DW_EH_PE_absptr \
	527	: DW_EH_PE_aligned) \
	528	: DW_EH_PE_absptr)
	529	#endif
e430824f CLT	530
	531	/* Misc. parameters. */
	532
	533	#define STORE_FLAG_VALUE 1
	534	#define Pmode SImode
	535	#define FUNCTION_MODE QImode
	536
	537	#define CASE_VECTOR_MODE Pmode
	538
e430824f CLT	539	#define LOAD_EXTEND_OP(MODE) (ZERO_EXTEND)
e430824f CLT	540
9e11bfef	541	#define WORD_REGISTER_OPERATIONS 1
e430824f CLT	542
e430824f CLT	543	#endif /* GCC_NIOS2_H */