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Diffstat (limited to 'gcc-4.9/gcc/config/nios2/nios2.h')
| -rw-r--r-- | gcc-4.9/gcc/config/nios2/nios2.h | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/config/nios2/nios2.h b/gcc-4.9/gcc/config/nios2/nios2.h new file mode 100644 index 000000000..17148d3e5 --- /dev/null +++ b/gcc-4.9/gcc/config/nios2/nios2.h @@ -0,0 +1,499 @@ +/* Definitions of target machine for Altera Nios II. + Copyright (C) 2012-2014 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 + +/* 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"); \ + } \ + 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 CC1_SPEC "%{G*}" + +#if TARGET_ENDIAN_DEFAULT == 0 +# define ASM_SPEC "%{!meb:-EL} %{meb:-EB}" +# define LINK_SPEC_ENDIAN "%{!meb:-EL} %{meb:-EB}" +# define MULTILIB_DEFAULTS { "EL" } +#else +# define ASM_SPEC "%{!mel:-EB} %{mel:-EL}" +# 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 CONSTANT_ALIGNMENT(EXP, ALIGN) \ + ((TREE_CODE (EXP) == STRING_CST) \ + && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN)) + +/* 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, \ + } + +#define MODES_TIEABLE_P(MODE1, MODE2) 1 +#define HARD_REGNO_MODE_OK(REGNO, MODE) 1 +#define HARD_REGNO_NREGS(REGNO, MODE) \ + ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD) + +/* Register Classes. */ + +enum reg_class +{ + NO_REGS, + SIB_REGS, + GP_REGS, + ALL_REGS, + LIM_REG_CLASSES +}; + +#define N_REG_CLASSES (int) LIM_REG_CLASSES + +#define REG_CLASS_NAMES \ + { "NO_REGS", \ + "SIB_REGS", \ + "GP_REGS", \ + "ALL_REGS" } + +#define GENERAL_REGS ALL_REGS + +#define REG_CLASS_CONTENTS \ + { \ + /* NO_REGS */ { 0, 0}, \ + /* SIB_REGS */ { 0xfe0c, 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) + +/* 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_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) + +/* 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 +#define STARTING_FRAME_OFFSET 0 +#define FIRST_PARM_OFFSET(FUNDECL) 0 + +/* Before the prologue, RA lives in r31. */ +#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, 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 FUNCTION_ARG_PADDING(MODE, TYPE) \ + (nios2_function_arg_padding ((MODE), (TYPE))) + +#define PAD_VARARGS_DOWN \ + (FUNCTION_ARG_PADDING (TYPE_MODE (type), type) == 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 PUSH_ARGS 0 +#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 + +/* 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 IN_LIBGCC2 +/* 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_LOCAL +#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ +do { \ + if ((SIZE) <= nios2_section_threshold) \ + 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) + +/* Nios II has no appropriate relocations for a 32-bit PC-relative or + section-relative pointer encoding. This therefore always chooses an + absolute representation for pointers. An unfortunate consequence of + this is that ld complains about the absolute fde encoding when linking + with -shared or -fpie, but the warning is harmless and there seems to + be no good way to suppress it. */ +#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ + (flag_pic ? DW_EH_PE_aligned : DW_EH_PE_sdata4) + +/* Misc. parameters. */ + +#define STORE_FLAG_VALUE 1 +#define Pmode SImode +#define FUNCTION_MODE QImode + +#define CASE_VECTOR_MODE Pmode + +#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1 + +#define LOAD_EXTEND_OP(MODE) (ZERO_EXTEND) + +#define WORD_REGISTER_OPERATIONS + +#endif /* GCC_NIOS2_H */ |