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709 |
jeremybenn |
/* Target Code for moxie
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Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation
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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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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "regs.h"
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#include "hard-reg-set.h"
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#include "insn-config.h"
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#include "conditions.h"
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#include "insn-flags.h"
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#include "output.h"
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#include "insn-attr.h"
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#include "flags.h"
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#include "recog.h"
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#include "reload.h"
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#include "diagnostic-core.h"
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#include "obstack.h"
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#include "tree.h"
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#include "expr.h"
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#include "optabs.h"
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#include "except.h"
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#include "function.h"
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#include "ggc.h"
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#include "target.h"
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#include "target-def.h"
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#include "tm_p.h"
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#include "langhooks.h"
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#include "df.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 (enum 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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void
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moxie_print_operand_address (FILE *file, 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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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 (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_alloc_cleared_machine_function ();
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}
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/* The TARGET_OPTION_OVERRIDE worker.
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All this curently does is set init_machine_status. */
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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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}
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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_regs[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 ? 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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279 |
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int regno;
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280 |
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rtx insn;
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281 |
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282 |
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moxie_compute_frame ();
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283 |
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284 |
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/* Save callee-saved registers. */
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285 |
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for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
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{
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287 |
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if (!fixed_regs[regno] && df_regs_ever_live_p (regno) && !call_used_regs[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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}
|
292 |
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}
|
293 |
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294 |
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if (cfun->machine->size_for_adjusting_sp > 0)
|
295 |
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{
|
296 |
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int i = cfun->machine->size_for_adjusting_sp;
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297 |
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while (i > 255)
|
298 |
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{
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299 |
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insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
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300 |
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stack_pointer_rtx,
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301 |
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GEN_INT (255)));
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302 |
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RTX_FRAME_RELATED_P (insn) = 1;
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303 |
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i -= 255;
|
304 |
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}
|
305 |
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if (i > 0)
|
306 |
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{
|
307 |
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insn = emit_insn (gen_subsi3 (stack_pointer_rtx,
|
308 |
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stack_pointer_rtx,
|
309 |
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GEN_INT (i)));
|
310 |
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RTX_FRAME_RELATED_P (insn) = 1;
|
311 |
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}
|
312 |
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}
|
313 |
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}
|
314 |
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|
315 |
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void
|
316 |
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moxie_expand_epilogue (void)
|
317 |
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{
|
318 |
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int regno;
|
319 |
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rtx reg;
|
320 |
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|
321 |
|
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if (cfun->machine->callee_saved_reg_size != 0)
|
322 |
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{
|
323 |
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reg = gen_rtx_REG (Pmode, MOXIE_R5);
|
324 |
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if (cfun->machine->callee_saved_reg_size <= 255)
|
325 |
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{
|
326 |
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emit_move_insn (reg, hard_frame_pointer_rtx);
|
327 |
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emit_insn (gen_subsi3
|
328 |
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(reg, reg,
|
329 |
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GEN_INT (cfun->machine->callee_saved_reg_size)));
|
330 |
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}
|
331 |
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else
|
332 |
|
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{
|
333 |
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emit_move_insn (reg,
|
334 |
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GEN_INT (-cfun->machine->callee_saved_reg_size));
|
335 |
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emit_insn (gen_addsi3 (reg, reg, hard_frame_pointer_rtx));
|
336 |
|
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}
|
337 |
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for (regno = FIRST_PSEUDO_REGISTER; regno-- > 0; )
|
338 |
|
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if (!fixed_regs[regno] && !call_used_regs[regno]
|
339 |
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&& df_regs_ever_live_p (regno))
|
340 |
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{
|
341 |
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rtx preg = gen_rtx_REG (Pmode, regno);
|
342 |
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emit_insn (gen_movsi_pop (reg, preg));
|
343 |
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}
|
344 |
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}
|
345 |
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|
346 |
|
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emit_jump_insn (gen_returner ());
|
347 |
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}
|
348 |
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|
349 |
|
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/* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
|
350 |
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|
351 |
|
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int
|
352 |
|
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moxie_initial_elimination_offset (int from, int to)
|
353 |
|
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{
|
354 |
|
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int ret;
|
355 |
|
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|
356 |
|
|
if ((from) == FRAME_POINTER_REGNUM && (to) == HARD_FRAME_POINTER_REGNUM)
|
357 |
|
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{
|
358 |
|
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/* Compute this since we need to use cfun->machine->local_vars_size. */
|
359 |
|
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moxie_compute_frame ();
|
360 |
|
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ret = -cfun->machine->callee_saved_reg_size;
|
361 |
|
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}
|
362 |
|
|
else if ((from) == ARG_POINTER_REGNUM && (to) == HARD_FRAME_POINTER_REGNUM)
|
363 |
|
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ret = 0x00;
|
364 |
|
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else
|
365 |
|
|
abort ();
|
366 |
|
|
|
367 |
|
|
return ret;
|
368 |
|
|
}
|
369 |
|
|
|
370 |
|
|
/* Worker function for TARGET_SETUP_INCOMING_VARARGS. */
|
371 |
|
|
|
372 |
|
|
static void
|
373 |
|
|
moxie_setup_incoming_varargs (cumulative_args_t cum_v,
|
374 |
|
|
enum machine_mode mode ATTRIBUTE_UNUSED,
|
375 |
|
|
tree type ATTRIBUTE_UNUSED,
|
376 |
|
|
int *pretend_size, int no_rtl)
|
377 |
|
|
{
|
378 |
|
|
CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
|
379 |
|
|
int regno;
|
380 |
|
|
int regs = 8 - *cum;
|
381 |
|
|
|
382 |
|
|
*pretend_size = regs < 0 ? 0 : GET_MODE_SIZE (SImode) * regs;
|
383 |
|
|
|
384 |
|
|
if (no_rtl)
|
385 |
|
|
return;
|
386 |
|
|
|
387 |
|
|
for (regno = *cum; regno < 8; regno++)
|
388 |
|
|
{
|
389 |
|
|
rtx reg = gen_rtx_REG (SImode, regno);
|
390 |
|
|
rtx slot = gen_rtx_PLUS (Pmode,
|
391 |
|
|
gen_rtx_REG (SImode, ARG_POINTER_REGNUM),
|
392 |
|
|
GEN_INT (UNITS_PER_WORD * (3 + (regno-2))));
|
393 |
|
|
|
394 |
|
|
emit_move_insn (gen_rtx_MEM (SImode, slot), reg);
|
395 |
|
|
}
|
396 |
|
|
}
|
397 |
|
|
|
398 |
|
|
|
399 |
|
|
/* Return the fixed registers used for condition codes. */
|
400 |
|
|
|
401 |
|
|
static bool
|
402 |
|
|
moxie_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2)
|
403 |
|
|
{
|
404 |
|
|
*p1 = CC_REG;
|
405 |
|
|
*p2 = INVALID_REGNUM;
|
406 |
|
|
return true;
|
407 |
|
|
}
|
408 |
|
|
|
409 |
|
|
/* Return the next register to be used to hold a function argument or
|
410 |
|
|
NULL_RTX if there's no more space. */
|
411 |
|
|
|
412 |
|
|
static rtx
|
413 |
|
|
moxie_function_arg (cumulative_args_t cum_v, enum machine_mode mode,
|
414 |
|
|
const_tree type ATTRIBUTE_UNUSED,
|
415 |
|
|
bool named ATTRIBUTE_UNUSED)
|
416 |
|
|
{
|
417 |
|
|
CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
|
418 |
|
|
|
419 |
|
|
if (*cum < 8)
|
420 |
|
|
return gen_rtx_REG (mode, *cum);
|
421 |
|
|
else
|
422 |
|
|
return NULL_RTX;
|
423 |
|
|
}
|
424 |
|
|
|
425 |
|
|
#define MOXIE_FUNCTION_ARG_SIZE(MODE, TYPE) \
|
426 |
|
|
((MODE) != BLKmode ? GET_MODE_SIZE (MODE) \
|
427 |
|
|
: (unsigned) int_size_in_bytes (TYPE))
|
428 |
|
|
|
429 |
|
|
static void
|
430 |
|
|
moxie_function_arg_advance (cumulative_args_t cum_v, enum machine_mode mode,
|
431 |
|
|
const_tree type, bool named ATTRIBUTE_UNUSED)
|
432 |
|
|
{
|
433 |
|
|
CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
|
434 |
|
|
|
435 |
|
|
*cum = (*cum < MOXIE_R6
|
436 |
|
|
? *cum + ((3 + MOXIE_FUNCTION_ARG_SIZE (mode, type)) / 4)
|
437 |
|
|
: *cum);
|
438 |
|
|
}
|
439 |
|
|
|
440 |
|
|
/* Return non-zero if the function argument described by TYPE is to be
|
441 |
|
|
passed by reference. */
|
442 |
|
|
|
443 |
|
|
static bool
|
444 |
|
|
moxie_pass_by_reference (cumulative_args_t cum ATTRIBUTE_UNUSED,
|
445 |
|
|
enum machine_mode mode, const_tree type,
|
446 |
|
|
bool named ATTRIBUTE_UNUSED)
|
447 |
|
|
{
|
448 |
|
|
unsigned HOST_WIDE_INT size;
|
449 |
|
|
|
450 |
|
|
if (type)
|
451 |
|
|
{
|
452 |
|
|
if (AGGREGATE_TYPE_P (type))
|
453 |
|
|
return true;
|
454 |
|
|
size = int_size_in_bytes (type);
|
455 |
|
|
}
|
456 |
|
|
else
|
457 |
|
|
size = GET_MODE_SIZE (mode);
|
458 |
|
|
|
459 |
|
|
return size > 4*6;
|
460 |
|
|
}
|
461 |
|
|
|
462 |
|
|
/* Some function arguments will only partially fit in the registers
|
463 |
|
|
that hold arguments. Given a new arg, return the number of bytes
|
464 |
|
|
that fit in argument passing registers. */
|
465 |
|
|
|
466 |
|
|
static int
|
467 |
|
|
moxie_arg_partial_bytes (cumulative_args_t cum_v,
|
468 |
|
|
enum machine_mode mode,
|
469 |
|
|
tree type, bool named)
|
470 |
|
|
{
|
471 |
|
|
CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
|
472 |
|
|
int bytes_left, size;
|
473 |
|
|
|
474 |
|
|
if (*cum >= 8)
|
475 |
|
|
return 0;
|
476 |
|
|
|
477 |
|
|
if (moxie_pass_by_reference (cum_v, mode, type, named))
|
478 |
|
|
size = 4;
|
479 |
|
|
else if (type)
|
480 |
|
|
{
|
481 |
|
|
if (AGGREGATE_TYPE_P (type))
|
482 |
|
|
return 0;
|
483 |
|
|
size = int_size_in_bytes (type);
|
484 |
|
|
}
|
485 |
|
|
else
|
486 |
|
|
size = GET_MODE_SIZE (mode);
|
487 |
|
|
|
488 |
|
|
bytes_left = (4 * 6) - ((*cum - 2) * 4);
|
489 |
|
|
|
490 |
|
|
if (size > bytes_left)
|
491 |
|
|
return bytes_left;
|
492 |
|
|
else
|
493 |
|
|
return 0;
|
494 |
|
|
}
|
495 |
|
|
|
496 |
|
|
/* Worker function for TARGET_STATIC_CHAIN. */
|
497 |
|
|
|
498 |
|
|
static rtx
|
499 |
|
|
moxie_static_chain (const_tree fndecl, bool incoming_p)
|
500 |
|
|
{
|
501 |
|
|
rtx addr, mem;
|
502 |
|
|
|
503 |
|
|
if (!DECL_STATIC_CHAIN (fndecl))
|
504 |
|
|
return NULL;
|
505 |
|
|
|
506 |
|
|
if (incoming_p)
|
507 |
|
|
addr = plus_constant (arg_pointer_rtx, 2 * UNITS_PER_WORD);
|
508 |
|
|
else
|
509 |
|
|
addr = plus_constant (stack_pointer_rtx, -UNITS_PER_WORD);
|
510 |
|
|
|
511 |
|
|
mem = gen_rtx_MEM (Pmode, addr);
|
512 |
|
|
MEM_NOTRAP_P (mem) = 1;
|
513 |
|
|
|
514 |
|
|
return mem;
|
515 |
|
|
}
|
516 |
|
|
|
517 |
|
|
/* Worker function for TARGET_ASM_TRAMPOLINE_TEMPLATE. */
|
518 |
|
|
|
519 |
|
|
static void
|
520 |
|
|
moxie_asm_trampoline_template (FILE *f)
|
521 |
|
|
{
|
522 |
|
|
fprintf (f, "\tpush $sp, $r0\n");
|
523 |
|
|
fprintf (f, "\tldi.l $r0, 0x0\n");
|
524 |
|
|
fprintf (f, "\tsto.l 0x8($fp), $r0\n");
|
525 |
|
|
fprintf (f, "\tpop $sp, $r0\n");
|
526 |
|
|
fprintf (f, "\tnop\n");
|
527 |
|
|
fprintf (f, "\tjmpa 0x0\n");
|
528 |
|
|
}
|
529 |
|
|
|
530 |
|
|
/* Worker function for TARGET_TRAMPOLINE_INIT. */
|
531 |
|
|
|
532 |
|
|
static void
|
533 |
|
|
moxie_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
|
534 |
|
|
{
|
535 |
|
|
rtx mem, fnaddr = XEXP (DECL_RTL (fndecl), 0);
|
536 |
|
|
|
537 |
|
|
emit_block_move (m_tramp, assemble_trampoline_template (),
|
538 |
|
|
GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL);
|
539 |
|
|
|
540 |
|
|
mem = adjust_address (m_tramp, SImode, 4);
|
541 |
|
|
emit_move_insn (mem, chain_value);
|
542 |
|
|
mem = adjust_address (m_tramp, SImode, 20);
|
543 |
|
|
emit_move_insn (mem, fnaddr);
|
544 |
|
|
}
|
545 |
|
|
|
546 |
|
|
/* The Global `targetm' Variable. */
|
547 |
|
|
|
548 |
|
|
/* Initialize the GCC target structure. */
|
549 |
|
|
|
550 |
|
|
#undef TARGET_PROMOTE_PROTOTYPES
|
551 |
|
|
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true
|
552 |
|
|
|
553 |
|
|
#undef TARGET_RETURN_IN_MEMORY
|
554 |
|
|
#define TARGET_RETURN_IN_MEMORY moxie_return_in_memory
|
555 |
|
|
#undef TARGET_MUST_PASS_IN_STACK
|
556 |
|
|
#define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size
|
557 |
|
|
#undef TARGET_PASS_BY_REFERENCE
|
558 |
|
|
#define TARGET_PASS_BY_REFERENCE moxie_pass_by_reference
|
559 |
|
|
#undef TARGET_ARG_PARTIAL_BYTES
|
560 |
|
|
#define TARGET_ARG_PARTIAL_BYTES moxie_arg_partial_bytes
|
561 |
|
|
#undef TARGET_FUNCTION_ARG
|
562 |
|
|
#define TARGET_FUNCTION_ARG moxie_function_arg
|
563 |
|
|
#undef TARGET_FUNCTION_ARG_ADVANCE
|
564 |
|
|
#define TARGET_FUNCTION_ARG_ADVANCE moxie_function_arg_advance
|
565 |
|
|
|
566 |
|
|
|
567 |
|
|
#undef TARGET_SETUP_INCOMING_VARARGS
|
568 |
|
|
#define TARGET_SETUP_INCOMING_VARARGS moxie_setup_incoming_varargs
|
569 |
|
|
|
570 |
|
|
#undef TARGET_FIXED_CONDITION_CODE_REGS
|
571 |
|
|
#define TARGET_FIXED_CONDITION_CODE_REGS moxie_fixed_condition_code_regs
|
572 |
|
|
|
573 |
|
|
/* Define this to return an RTX representing the place where a
|
574 |
|
|
function returns or receives a value of data type RET_TYPE, a tree
|
575 |
|
|
node node representing a data type. */
|
576 |
|
|
#undef TARGET_FUNCTION_VALUE
|
577 |
|
|
#define TARGET_FUNCTION_VALUE moxie_function_value
|
578 |
|
|
#undef TARGET_LIBCALL_VALUE
|
579 |
|
|
#define TARGET_LIBCALL_VALUE moxie_libcall_value
|
580 |
|
|
#undef TARGET_FUNCTION_VALUE_REGNO_P
|
581 |
|
|
#define TARGET_FUNCTION_VALUE_REGNO_P moxie_function_value_regno_p
|
582 |
|
|
|
583 |
|
|
#undef TARGET_FRAME_POINTER_REQUIRED
|
584 |
|
|
#define TARGET_FRAME_POINTER_REQUIRED hook_bool_void_true
|
585 |
|
|
|
586 |
|
|
#undef TARGET_STATIC_CHAIN
|
587 |
|
|
#define TARGET_STATIC_CHAIN moxie_static_chain
|
588 |
|
|
#undef TARGET_ASM_TRAMPOLINE_TEMPLATE
|
589 |
|
|
#define TARGET_ASM_TRAMPOLINE_TEMPLATE moxie_asm_trampoline_template
|
590 |
|
|
#undef TARGET_TRAMPOLINE_INIT
|
591 |
|
|
#define TARGET_TRAMPOLINE_INIT moxie_trampoline_init
|
592 |
|
|
|
593 |
|
|
#undef TARGET_OPTION_OVERRIDE
|
594 |
|
|
#define TARGET_OPTION_OVERRIDE moxie_option_override
|
595 |
|
|
|
596 |
|
|
struct gcc_target targetm = TARGET_INITIALIZER;
|
597 |
|
|
|
598 |
|
|
#include "gt-moxie.h"
|