665 lines
17 KiB
C
665 lines
17 KiB
C
/* Target Code for moxie
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Copyright (C) 2008-2021 Free Software Foundation, Inc.
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Contributed by Anthony Green.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#define IN_TARGET_CODE 1
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "backend.h"
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#include "target.h"
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#include "rtl.h"
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#include "tree.h"
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#include "stringpool.h"
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#include "attribs.h"
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#include "df.h"
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#include "regs.h"
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#include "memmodel.h"
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#include "emit-rtl.h"
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#include "diagnostic-core.h"
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#include "output.h"
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#include "stor-layout.h"
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#include "varasm.h"
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#include "calls.h"
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#include "expr.h"
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#include "builtins.h"
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/* This file should be included last. */
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#include "target-def.h"
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#define LOSE_AND_RETURN(msgid, x) \
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do \
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{ \
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moxie_operand_lossage (msgid, x); \
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return; \
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} while (0)
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/* Worker function for TARGET_RETURN_IN_MEMORY. */
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static bool
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moxie_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
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{
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const HOST_WIDE_INT size = int_size_in_bytes (type);
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return (size == -1 || size > 2 * UNITS_PER_WORD);
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}
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/* Define how to find the value returned by a function.
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VALTYPE is the data type of the value (as a tree).
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If the precise function being called is known, FUNC is its
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FUNCTION_DECL; otherwise, FUNC is 0.
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We always return values in register $r0 for moxie. */
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static rtx
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moxie_function_value (const_tree valtype,
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const_tree fntype_or_decl ATTRIBUTE_UNUSED,
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bool outgoing ATTRIBUTE_UNUSED)
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{
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return gen_rtx_REG (TYPE_MODE (valtype), MOXIE_R0);
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}
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/* Define how to find the value returned by a library function.
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We always return values in register $r0 for moxie. */
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static rtx
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moxie_libcall_value (machine_mode mode,
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const_rtx fun ATTRIBUTE_UNUSED)
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{
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return gen_rtx_REG (mode, MOXIE_R0);
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}
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/* Handle TARGET_FUNCTION_VALUE_REGNO_P.
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We always return values in register $r0 for moxie. */
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static bool
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moxie_function_value_regno_p (const unsigned int regno)
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{
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return (regno == MOXIE_R0);
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}
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/* Emit an error message when we're in an asm, and a fatal error for
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"normal" insns. Formatted output isn't easily implemented, since we
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use output_operand_lossage to output the actual message and handle the
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categorization of the error. */
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static void
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moxie_operand_lossage (const char *msgid, rtx op)
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{
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debug_rtx (op);
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output_operand_lossage ("%s", msgid);
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}
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/* The PRINT_OPERAND_ADDRESS worker. */
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static void
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moxie_print_operand_address (FILE *file, machine_mode, rtx x)
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{
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switch (GET_CODE (x))
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{
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case REG:
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fprintf (file, "(%s)", reg_names[REGNO (x)]);
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break;
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case PLUS:
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switch (GET_CODE (XEXP (x, 1)))
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{
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case CONST_INT:
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fprintf (file, "%ld(%s)",
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INTVAL(XEXP (x, 1)), reg_names[REGNO (XEXP (x, 0))]);
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break;
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case SYMBOL_REF:
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output_addr_const (file, XEXP (x, 1));
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fprintf (file, "(%s)", reg_names[REGNO (XEXP (x, 0))]);
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break;
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case CONST:
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{
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rtx plus = XEXP (XEXP (x, 1), 0);
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if (GET_CODE (XEXP (plus, 0)) == SYMBOL_REF
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&& CONST_INT_P (XEXP (plus, 1)))
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{
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output_addr_const(file, XEXP (plus, 0));
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fprintf (file,"+%ld(%s)", INTVAL (XEXP (plus, 1)),
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reg_names[REGNO (XEXP (x, 0))]);
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}
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else
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abort();
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}
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break;
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default:
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abort();
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}
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break;
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default:
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output_addr_const (file, x);
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break;
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}
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}
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/* The PRINT_OPERAND worker. */
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static void
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moxie_print_operand (FILE *file, rtx x, int code)
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{
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rtx operand = x;
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/* New code entries should just be added to the switch below. If
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handling is finished, just return. If handling was just a
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modification of the operand, the modified operand should be put in
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"operand", and then do a break to let default handling
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(zero-modifier) output the operand. */
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switch (code)
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{
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case 0:
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/* No code, print as usual. */
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break;
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default:
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LOSE_AND_RETURN ("invalid operand modifier letter", x);
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}
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/* Print an operand as without a modifier letter. */
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switch (GET_CODE (operand))
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{
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case REG:
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if (REGNO (operand) > MOXIE_R13)
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internal_error ("internal error: bad register: %d", REGNO (operand));
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fprintf (file, "%s", reg_names[REGNO (operand)]);
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return;
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case MEM:
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output_address (GET_MODE (XEXP (operand, 0)), XEXP (operand, 0));
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return;
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default:
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/* No need to handle all strange variants, let output_addr_const
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do it for us. */
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if (CONSTANT_P (operand))
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{
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output_addr_const (file, operand);
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return;
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}
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LOSE_AND_RETURN ("unexpected operand", x);
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}
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}
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/* Per-function machine data. */
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struct GTY(()) machine_function
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{
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/* Number of bytes saved on the stack for callee saved registers. */
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int callee_saved_reg_size;
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/* Number of bytes saved on the stack for local variables. */
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int local_vars_size;
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/* The sum of 2 sizes: locals vars and padding byte for saving the
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* registers. Used in expand_prologue () and expand_epilogue(). */
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int size_for_adjusting_sp;
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};
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/* Zero initialization is OK for all current fields. */
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static struct machine_function *
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moxie_init_machine_status (void)
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{
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return ggc_cleared_alloc<machine_function> ();
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}
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/* The TARGET_OPTION_OVERRIDE worker. */
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static void
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moxie_option_override (void)
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{
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/* Set the per-function-data initializer. */
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init_machine_status = moxie_init_machine_status;
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#ifdef TARGET_MOXIEBOX
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target_flags |= MASK_HAS_MULX;
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#endif
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}
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/* Compute the size of the local area and the size to be adjusted by the
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* prologue and epilogue. */
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static void
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moxie_compute_frame (void)
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{
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/* For aligning the local variables. */
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int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT;
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int padding_locals;
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int regno;
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/* Padding needed for each element of the frame. */
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cfun->machine->local_vars_size = get_frame_size ();
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/* Align to the stack alignment. */
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padding_locals = cfun->machine->local_vars_size % stack_alignment;
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if (padding_locals)
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padding_locals = stack_alignment - padding_locals;
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cfun->machine->local_vars_size += padding_locals;
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cfun->machine->callee_saved_reg_size = 0;
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/* Save callee-saved registers. */
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for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
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if (df_regs_ever_live_p (regno) && (! call_used_or_fixed_reg_p (regno)))
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cfun->machine->callee_saved_reg_size += 4;
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cfun->machine->size_for_adjusting_sp =
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crtl->args.pretend_args_size
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+ cfun->machine->local_vars_size
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+ (ACCUMULATE_OUTGOING_ARGS
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? (HOST_WIDE_INT) crtl->outgoing_args_size : 0);
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}
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void
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moxie_expand_prologue (void)
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{
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int regno;
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rtx insn;
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moxie_compute_frame ();
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if (flag_stack_usage_info)
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current_function_static_stack_size = cfun->machine->size_for_adjusting_sp;
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/* Save callee-saved registers. */
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for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
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{
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if (df_regs_ever_live_p (regno)
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&& !call_used_or_fixed_reg_p (regno))
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{
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insn = emit_insn (gen_movsi_push (gen_rtx_REG (Pmode, regno)));
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RTX_FRAME_RELATED_P (insn) = 1;
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}
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}
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if (cfun->machine->size_for_adjusting_sp > 0)
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{
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int i = cfun->machine->size_for_adjusting_sp;
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while ((i >= 255) && (i <= 510))
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{
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insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
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stack_pointer_rtx,
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GEN_INT (255)));
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RTX_FRAME_RELATED_P (insn) = 1;
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i -= 255;
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}
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if (i <= 255)
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{
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insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
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stack_pointer_rtx,
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GEN_INT (i)));
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RTX_FRAME_RELATED_P (insn) = 1;
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}
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else
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{
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rtx reg = gen_rtx_REG (SImode, MOXIE_R12);
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insn = emit_move_insn (reg, GEN_INT (i));
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RTX_FRAME_RELATED_P (insn) = 1;
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insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
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stack_pointer_rtx,
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reg));
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RTX_FRAME_RELATED_P (insn) = 1;
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}
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}
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}
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void
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moxie_expand_epilogue (void)
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{
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int regno;
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rtx reg;
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if (cfun->machine->callee_saved_reg_size != 0)
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{
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reg = gen_rtx_REG (Pmode, MOXIE_R12);
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if (cfun->machine->callee_saved_reg_size <= 255)
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{
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emit_move_insn (reg, hard_frame_pointer_rtx);
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emit_insn (gen_subsi3
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(reg, reg,
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GEN_INT (cfun->machine->callee_saved_reg_size)));
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}
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else
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{
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emit_move_insn (reg,
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GEN_INT (-cfun->machine->callee_saved_reg_size));
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emit_insn (gen_addsi3 (reg, reg, hard_frame_pointer_rtx));
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}
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for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0; )
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if (!call_used_or_fixed_reg_p (regno)
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&& df_regs_ever_live_p (regno))
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{
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rtx preg = gen_rtx_REG (Pmode, regno);
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emit_insn (gen_movsi_pop (reg, preg));
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}
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}
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emit_jump_insn (gen_returner ());
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}
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/* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
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int
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moxie_initial_elimination_offset (int from, int to)
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{
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int ret;
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if ((from) == FRAME_POINTER_REGNUM && (to) == HARD_FRAME_POINTER_REGNUM)
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{
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/* Compute this since we need to use cfun->machine->local_vars_size. */
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moxie_compute_frame ();
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ret = -cfun->machine->callee_saved_reg_size;
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}
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else if ((from) == ARG_POINTER_REGNUM && (to) == HARD_FRAME_POINTER_REGNUM)
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ret = 0x00;
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else
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abort ();
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return ret;
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}
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/* Worker function for TARGET_SETUP_INCOMING_VARARGS. */
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static void
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moxie_setup_incoming_varargs (cumulative_args_t cum_v,
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const function_arg_info &,
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int *pretend_size, int no_rtl)
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{
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CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
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int regno;
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int regs = 8 - *cum;
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*pretend_size = regs < 0 ? 0 : GET_MODE_SIZE (SImode) * regs;
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if (no_rtl)
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return;
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for (regno = *cum; regno < 8; regno++)
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{
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rtx reg = gen_rtx_REG (SImode, regno);
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rtx slot = gen_rtx_PLUS (Pmode,
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gen_rtx_REG (SImode, ARG_POINTER_REGNUM),
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GEN_INT (UNITS_PER_WORD * (3 + (regno-2))));
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emit_move_insn (gen_rtx_MEM (SImode, slot), reg);
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}
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}
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/* Return the fixed registers used for condition codes. */
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static bool
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moxie_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2)
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{
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*p1 = CC_REG;
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*p2 = INVALID_REGNUM;
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return true;
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}
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/* Return the next register to be used to hold a function argument or
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NULL_RTX if there's no more space. */
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static rtx
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moxie_function_arg (cumulative_args_t cum_v, const function_arg_info &arg)
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{
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CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
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if (*cum < 8)
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return gen_rtx_REG (arg.mode, *cum);
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else
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return NULL_RTX;
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}
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#define MOXIE_FUNCTION_ARG_SIZE(MODE, TYPE) \
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((MODE) != BLKmode ? GET_MODE_SIZE (MODE) \
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: (unsigned) int_size_in_bytes (TYPE))
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static void
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moxie_function_arg_advance (cumulative_args_t cum_v,
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const function_arg_info &arg)
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{
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CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
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*cum = (*cum < MOXIE_R6
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? *cum + ((3 + MOXIE_FUNCTION_ARG_SIZE (arg.mode, arg.type)) / 4)
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: *cum);
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}
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/* Return non-zero if the function argument described by ARG is to be
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passed by reference. */
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static bool
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moxie_pass_by_reference (cumulative_args_t, const function_arg_info &arg)
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{
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if (arg.aggregate_type_p ())
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return true;
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unsigned HOST_WIDE_INT size = arg.type_size_in_bytes ();
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return size > 4*6;
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}
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/* Some function arguments will only partially fit in the registers
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that hold arguments. Given a new arg, return the number of bytes
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that fit in argument passing registers. */
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static int
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moxie_arg_partial_bytes (cumulative_args_t cum_v, const function_arg_info &arg)
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{
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CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
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int bytes_left, size;
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if (*cum >= 8)
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return 0;
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if (moxie_pass_by_reference (cum_v, arg))
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size = 4;
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else if (arg.type)
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{
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if (AGGREGATE_TYPE_P (arg.type))
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return 0;
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size = int_size_in_bytes (arg.type);
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}
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else
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size = GET_MODE_SIZE (arg.mode);
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bytes_left = (4 * 6) - ((*cum - 2) * 4);
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if (size > bytes_left)
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return bytes_left;
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else
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return 0;
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}
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/* Worker function for TARGET_STATIC_CHAIN. */
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static rtx
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moxie_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
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{
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rtx addr, mem;
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if (incoming_p)
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addr = plus_constant (Pmode, arg_pointer_rtx, 2 * UNITS_PER_WORD);
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else
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addr = plus_constant (Pmode, stack_pointer_rtx, -UNITS_PER_WORD);
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mem = gen_rtx_MEM (Pmode, addr);
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MEM_NOTRAP_P (mem) = 1;
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return mem;
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}
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/* Worker function for TARGET_ASM_TRAMPOLINE_TEMPLATE. */
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static void
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moxie_asm_trampoline_template (FILE *f)
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{
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fprintf (f, "\tpush $sp, $r0\n");
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fprintf (f, "\tldi.l $r0, 0x0\n");
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fprintf (f, "\tsto.l 0x8($fp), $r0\n");
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fprintf (f, "\tpop $sp, $r0\n");
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fprintf (f, "\tjmpa 0x0\n");
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}
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/* Worker function for TARGET_TRAMPOLINE_INIT. */
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static void
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moxie_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
|
|
{
|
|
rtx mem, fnaddr = XEXP (DECL_RTL (fndecl), 0);
|
|
|
|
emit_block_move (m_tramp, assemble_trampoline_template (),
|
|
GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL);
|
|
|
|
mem = adjust_address (m_tramp, SImode, 4);
|
|
emit_move_insn (mem, chain_value);
|
|
mem = adjust_address (m_tramp, SImode, 16);
|
|
emit_move_insn (mem, fnaddr);
|
|
}
|
|
|
|
/* Return true for memory offset addresses between -32768 and 32767. */
|
|
bool
|
|
moxie_offset_address_p (rtx x)
|
|
{
|
|
x = XEXP (x, 0);
|
|
|
|
if (GET_CODE (x) == PLUS)
|
|
{
|
|
x = XEXP (x, 1);
|
|
if (GET_CODE (x) == CONST_INT)
|
|
{
|
|
unsigned int v = INTVAL (x) & 0xFFFF8000;
|
|
return (v == 0xFFFF8000 || v == 0x00000000);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Helper function for `moxie_legitimate_address_p'. */
|
|
|
|
static bool
|
|
moxie_reg_ok_for_base_p (const_rtx reg, bool strict_p)
|
|
{
|
|
int regno = REGNO (reg);
|
|
|
|
if (strict_p)
|
|
return HARD_REGNO_OK_FOR_BASE_P (regno)
|
|
|| HARD_REGNO_OK_FOR_BASE_P (reg_renumber[regno]);
|
|
else
|
|
return !HARD_REGISTER_NUM_P (regno)
|
|
|| HARD_REGNO_OK_FOR_BASE_P (regno);
|
|
}
|
|
|
|
/* Worker function for TARGET_LEGITIMATE_ADDRESS_P. */
|
|
|
|
static bool
|
|
moxie_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
|
|
rtx x, bool strict_p,
|
|
addr_space_t as)
|
|
{
|
|
gcc_assert (ADDR_SPACE_GENERIC_P (as));
|
|
|
|
if (GET_CODE(x) == PLUS
|
|
&& REG_P (XEXP (x, 0))
|
|
&& moxie_reg_ok_for_base_p (XEXP (x, 0), strict_p)
|
|
&& CONST_INT_P (XEXP (x, 1))
|
|
&& IN_RANGE (INTVAL (XEXP (x, 1)), -32768, 32767))
|
|
return true;
|
|
if (REG_P (x) && moxie_reg_ok_for_base_p (x, strict_p))
|
|
return true;
|
|
if (GET_CODE (x) == SYMBOL_REF
|
|
|| GET_CODE (x) == LABEL_REF
|
|
|| GET_CODE (x) == CONST)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/* The Global `targetm' Variable. */
|
|
|
|
/* Initialize the GCC target structure. */
|
|
|
|
#undef TARGET_PROMOTE_PROTOTYPES
|
|
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true
|
|
|
|
#undef TARGET_RETURN_IN_MEMORY
|
|
#define TARGET_RETURN_IN_MEMORY moxie_return_in_memory
|
|
#undef TARGET_MUST_PASS_IN_STACK
|
|
#define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size
|
|
#undef TARGET_PASS_BY_REFERENCE
|
|
#define TARGET_PASS_BY_REFERENCE moxie_pass_by_reference
|
|
#undef TARGET_ARG_PARTIAL_BYTES
|
|
#define TARGET_ARG_PARTIAL_BYTES moxie_arg_partial_bytes
|
|
#undef TARGET_FUNCTION_ARG
|
|
#define TARGET_FUNCTION_ARG moxie_function_arg
|
|
#undef TARGET_FUNCTION_ARG_ADVANCE
|
|
#define TARGET_FUNCTION_ARG_ADVANCE moxie_function_arg_advance
|
|
|
|
#undef TARGET_LRA_P
|
|
#define TARGET_LRA_P hook_bool_void_false
|
|
|
|
#undef TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P
|
|
#define TARGET_ADDR_SPACE_LEGITIMATE_ADDRESS_P moxie_legitimate_address_p
|
|
|
|
#undef TARGET_SETUP_INCOMING_VARARGS
|
|
#define TARGET_SETUP_INCOMING_VARARGS moxie_setup_incoming_varargs
|
|
|
|
#undef TARGET_FIXED_CONDITION_CODE_REGS
|
|
#define TARGET_FIXED_CONDITION_CODE_REGS moxie_fixed_condition_code_regs
|
|
|
|
/* Define this to return an RTX representing the place where a
|
|
function returns or receives a value of data type RET_TYPE, a tree
|
|
node representing a data type. */
|
|
#undef TARGET_FUNCTION_VALUE
|
|
#define TARGET_FUNCTION_VALUE moxie_function_value
|
|
#undef TARGET_LIBCALL_VALUE
|
|
#define TARGET_LIBCALL_VALUE moxie_libcall_value
|
|
#undef TARGET_FUNCTION_VALUE_REGNO_P
|
|
#define TARGET_FUNCTION_VALUE_REGNO_P moxie_function_value_regno_p
|
|
|
|
#undef TARGET_FRAME_POINTER_REQUIRED
|
|
#define TARGET_FRAME_POINTER_REQUIRED hook_bool_void_true
|
|
|
|
#undef TARGET_STATIC_CHAIN
|
|
#define TARGET_STATIC_CHAIN moxie_static_chain
|
|
#undef TARGET_ASM_TRAMPOLINE_TEMPLATE
|
|
#define TARGET_ASM_TRAMPOLINE_TEMPLATE moxie_asm_trampoline_template
|
|
#undef TARGET_TRAMPOLINE_INIT
|
|
#define TARGET_TRAMPOLINE_INIT moxie_trampoline_init
|
|
|
|
#undef TARGET_OPTION_OVERRIDE
|
|
#define TARGET_OPTION_OVERRIDE moxie_option_override
|
|
|
|
#undef TARGET_PRINT_OPERAND
|
|
#define TARGET_PRINT_OPERAND moxie_print_operand
|
|
#undef TARGET_PRINT_OPERAND_ADDRESS
|
|
#define TARGET_PRINT_OPERAND_ADDRESS moxie_print_operand_address
|
|
|
|
#undef TARGET_CONSTANT_ALIGNMENT
|
|
#define TARGET_CONSTANT_ALIGNMENT constant_alignment_word_strings
|
|
|
|
struct gcc_target targetm = TARGET_INITIALIZER;
|
|
|
|
#include "gt-moxie.h"
|