/* Definitions of target machine for GNU compiler for Pyramid 90 Series.   Copyright (C) 1989 Free Software Foundation, Inc.This file is part of GNU CC.GNU CC is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 1, or (at your option)any later version.GNU CC is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with GNU CC; see the file COPYING.  If not, write tothe Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  *//* * If you're going to change this, and you haven't already, * you should get and read * 	``OSx Operating System Porting Guide'', *	  publication number 4100-0066-A *	  Revision A *	  Pyramid Technology Corporation. * * or whatever the most recent version is.  In any case, page and * section number references given herein refer to this document. * *  The instruction table for gdb lists the available insns and *  the valid addressing modes. * *  Any other information on the Pyramid architecture is proprietary *  and hard to get. (Pyramid cc -S and adb are also useful.) * *//*** Run-time compilation parameters selecting different hardware subsets. ***//* Names to predefine in the preprocessor for this target machine.  */#define CPP_PREDEFINES "-Dpyr -Dunix"/* Print subsidiary information on the compiler version in use.  */#define TARGET_VERSION fprintf (stderr, " (pyr)");extern int target_flags;/* Nonzero if compiling code that Unix assembler can assemble.  */#define TARGET_UNIX_ASM (target_flags & 1)/* Use the indexed addressing modes (were once not known to work).   Leaving this in means we can disable them and so find out what   they win us.  */#define TARGET_INDEX (target_flags & 2)/* Implement stdarg in the same fashion used on all other machines.  */#define TARGET_GNU_STDARG   (target_flags & 4)/* Compile using RETD to pop off the args.   This will not work unless you use prototypes at least   for all functions that can take varying numbers of args.   This contravenes the Pyramid calling convention, so we don't   do it yet.  */#define TARGET_RETD (target_flags & 8)/* Macros used in the machine description to test the flags.  *//* Macro to define tables used to set the flags.   This is a list in braces of pairs in braces,   each pair being { "NAME", VALUE }   where VALUE is the bits to set or minus the bits to clear.   An empty string NAME is used to identify the default VALUE.   -mgnu will be useful if we ever have GAS on a pyramid.   -mindex was used to enable indexing when I didn't understand    how pyramid's indexing modes worked.  */#define TARGET_SWITCHES  \  { {"unix", 1},  		\    {"gnu", -1},  		\    {"index", 2},		\    {"noindex", -2},		\    {"gnu-stdarg", 4},		\    {"nognu-stdarg", -4},	\    {"retd", 8},		\    {"no-retd", -8},		\    { "", TARGET_DEFAULT}}/* Default target_flags if no switches specified.   (equivalent to "-munix -mindex -mgnu-stdarg")  */#ifndef TARGET_DEFAULT#define TARGET_DEFAULT (1 + 2 + 4)#endif/*** Target machine storage layout ***//* Define this if most significant bit is lowest numbered   in instructions that operate on numbered bit-fields.   This is not true on the pyramid.  *//* #define BITS_BIG_ENDIAN *//* Define this if most significant byte of a word is the lowest numbered.  */#define BYTES_BIG_ENDIAN/* Define this if most significant word of a multiword number is numbered.  */#define WORDS_BIG_ENDIAN/* Number of bits in an addressible storage unit */#define BITS_PER_UNIT 8/* Width in bits of a "word", which is the contents of a machine register.   Note that this is not necessarily the width of data type `int';   if using 16-bit ints on a 68000, this would still be 32.   But on a machine with 16-bit registers, this would be 16.  */#define BITS_PER_WORD 32/* Width of a word, in units (bytes).  */#define UNITS_PER_WORD 4/* Width in bits of a pointer.   See also the macro `Pmode' defined below.  */#define POINTER_SIZE 32/* Allocation boundary (in *bits*) for storing pointers in memory.  */#define POINTER_BOUNDARY 32/* Allocation boundary (in *bits*) for storing arguments in argument list.  */#define PARM_BOUNDARY 32/* Boundary (in *bits*) on which stack pointer should be aligned.  */#define STACK_BOUNDARY 32/* Allocation boundary (in *bits*) for the code of a function.  */#define FUNCTION_BOUNDARY 32/* Alignment of field after `int : 0' in a structure.  */#define EMPTY_FIELD_BOUNDARY 32/* No data type wants to be aligned rounder than this.  */#define BIGGEST_ALIGNMENT 32/* Specified types of bitfields affect alignment of those fields   and of the structure as a whole.  */#define PCC_BITFIELD_TYPE_MATTERS 1/* Make strings word-aligned so dhrystone will run faster.   Pyramid documentation says the best alignment is to align   on the size of a cache line, which is 16 bytes.   Newer pyrs have single insns that do strcmp() and strcpy(), so this   may not actually win anything.   *//* Try to increase aligment.  *//* Use kludge to maintain alignment for pyramid. See   DATA_SECTION_ASM_OP below.  */#define CONSTANT_ALIGNMENT(CODE, TYPEALIGN) \  ((CODE) == STRING_CST ? (TYPEALIGN) * 4 : (TYPEALIGN))/* Define this if move instructions will actually fail to work   when given unaligned data.  */#define STRICT_ALIGNMENT/*** Standard register usage.  ***//* Number of actual hardware registers.   The hardware registers are assigned numbers for the compiler   from 0 to just below FIRST_PSEUDO_REGISTER.   All registers that the compiler knows about must be given numbers,   even those that are not normally considered general registers.  *//* Nota Bene:   Pyramids have 64 addressable 32-bit registers, arranged as four   groups: global, parameter, local, and temporary.     The sixteen global registers are fairly conventional; the last   four are overloaded with a PSW, frame pointer, and stack pointer.   The non-dedicated global registers used to be reserved for Pyramid   operating systems, and still have cryptic and undocumented uses for   certain library calls.  We avoid them.   The parameter, local, and temporary registers provide _register_   _windowing_. Each procedure call has its own set of these 48   registers, which constitute its call frame. (These frames are   allocated on a stack separate from the conventional data stack,   called the _control_ _stack_.   facility hereby the temporary registers of frame n   become the parameter registers of frame n+1, viz.:                                 0         15 0         15 0         15                                +------------+------------+------------+                                |            |            |            |                                +------------+------------+------------+                                   Parameter     Local       Temporary                                      ^                                      |                                      v        0         15 0         15 0         15      +------------+------------+------------+      |            |            |            |      +------------+------------+------------+         Parameter     Local       Temporary   Temporary registers are used for parameter passing, and are not   preserved across calls.  TR14 and TR15 are reserved and should   never be used; since they are used to save the next frame's PC   and stack pointer, their contents may be destroyed at any time by   an interrupt. */#define PYR_GREG(n) (n)#define PYR_PREG(n) (16+(n))#define PYR_LREG(n) (32+(n))#define PYR_TREG(n) (48+(n))#define FIRST_PSEUDO_REGISTER 64/* 1 for registers that have pervasive standard uses   and are not available for the register allocator.   On the pyramid, these are LOGPSW, CFP, SP, PC, but we leave the other   global regs alone as well.  */#define FIXED_REGISTERS \  {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,	\   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,	\   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,	\   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}/* 1 for registers not available across function calls.   These must include the FIXED_REGISTERS and also any   registers that can be used without being saved.   The latter must include the registers where values are returned   and the register where structure-value addresses are passed.   Aside from that, you can include as many other registers as you like.  */#define CALL_USED_REGISTERS \  {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,	\   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,	\   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 	\   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}/* #define DEFAULT_CALLER_SAVES *//* Return number of consecutive hard regs needed starting at reg REGNO   to hold something of mode MODE.   This is ordinarily the length in words of a value of mode MODE   but can be less for certain modes in special long registers.   On the pyramid, all registers are one word long.  */#define HARD_REGNO_NREGS(REGNO, MODE)   \ ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.   On the pyramid, all registers can hold all modes.  *//* -->FIXME: this is not the case for 64-bit quantities in tr11/12 through   --> TR14/15.  This should be fixed,  but to do it correctly, we also   --> need to fix MODES_TIEABLE_P. Yuk.  We ignore this, since GCC should   --> do the "right" thing due to FIXED_REGISTERS. */#define HARD_REGNO_MODE_OK(REGNO, MODE) 1/* Value is 1 if it is a good idea to tie two pseudo registers   when one has mode MODE1 and one has mode MODE2.   If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,   for any hard reg, then this must be 0 for correct output.  */#define MODES_TIEABLE_P(MODE1, MODE2) 1/* Specify the registers used for certain standard purposes.   The values of these macros are register numbers.  *//* Pyramid pc is overloaded on global register 15.  */#define PC_REGNUM PYR_GREG(15)/* Register to use for pushing function arguments.   --> on Pyramids, the data stack pointer. */#define STACK_POINTER_REGNUM PYR_GREG(14)/* Base register for access to local variables of the function.   Pyramid uses CFP (GR13) as both frame pointer and argument pointer. */#define FRAME_POINTER_REGNUM 13 /* PYR_GREG(13) *//* Value should be nonzero if functions must have frame pointers.   Zero means the frame pointer need not be set up (and parms   may be accessed via the stack pointer) in functions that seem suitable.   This is computed in `reload', in reload1.c.   Setting this to 1 can't break anything.  Since the Pyramid has   register windows, I don't know if defining this to be zero can   win anything.  It could changed later, if it wins. */#define FRAME_POINTER_REQUIRED 1/* Base register for access to arguments of the function.  */#define ARG_POINTER_REGNUM 13 /* PYR_GREG(13) *//* Register in which static-chain is passed to a function.  *//* If needed, Pyramid says to use temporary register 12. */#define STATIC_CHAIN_REGNUM PYR_TREG(12)/* Register in which address to store a structure value   is passed to a function.   On a Pyramid, this is temporary register 0 (TR0).   */#define STRUCT_VALUE_REGNUM PYR_TREG(0)#define STRUCT_VALUE_INCOMING_REGNUM PYR_PREG(0)/* Define the classes of registers for register constraints in the   machine description.  Also define ranges of constants.   One of the classes must always be named ALL_REGS and include all hard regs.   If there is more than one class, another class must be named NO_REGS   and contain no registers.   The name GENERAL_REGS must be the name of a class (or an alias for   another name such as ALL_REGS).  This is the class of registers   that is allowed by "g" or "r" in a register constraint.   Also, registers outside this class are allocated only when   instructions express preferences for them.   The classes must be numbered in nondecreasing order; that is,   a larger-numbered class must never be contained completely   in a smaller-numbered class.   For any two classes, it is very desirable that there be another   class that represents their union.  *//* The pyramid has only one kind of registers, so NO_REGS and ALL_REGS   are the only classes.  */enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES };#define N_REG_CLASSES (int) LIM_REG_CLASSES/* Since GENERAL_REGS is the same class as ALL_REGS,   don't give it a different class number; just make it an alias.  */#define GENERAL_REGS ALL_REGS/* Give names of register classes as strings for dump file.   */#define REG_CLASS_NAMES \ {"NO_REGS", "ALL_REGS" }/* Define which registers fit in which classes.   This is an initializer for a vector of HARD_REG_SET   of length N_REG_CLASSES.  */#define REG_CLASS_CONTENTS {{0,0}, {0xffffffff,0xffffffff}}