[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

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