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436 lines
10 KiB
C
436 lines
10 KiB
C
/* m32r simulator support code
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Copyright (C) 1996-2023 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file is part of GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This must come before any other includes. */
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#include "defs.h"
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#define WANT_CPU m32rbf
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#define WANT_CPU_M32RBF
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#include "sim-main.h"
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#include "cgen-mem.h"
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#include "cgen-ops.h"
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#include <stdlib.h>
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#include "m32r-sim.h"
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/* Return the size of REGNO in bytes. */
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static int
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m32rbf_register_size (int regno)
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{
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return 4;
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}
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/* Decode gdb ctrl register number. */
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int
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m32r_decode_gdb_ctrl_regnum (int gdb_regnum)
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{
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switch (gdb_regnum)
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{
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case PSW_REGNUM : return H_CR_PSW;
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case CBR_REGNUM : return H_CR_CBR;
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case SPI_REGNUM : return H_CR_SPI;
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case SPU_REGNUM : return H_CR_SPU;
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case BPC_REGNUM : return H_CR_BPC;
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case BBPSW_REGNUM : return H_CR_BBPSW;
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case BBPC_REGNUM : return H_CR_BBPC;
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case EVB_REGNUM : return H_CR_CR5;
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}
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abort ();
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}
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/* The contents of BUF are in target byte order. */
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int
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m32rbf_fetch_register (SIM_CPU *current_cpu, int rn, void *buf, int len)
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{
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int size = m32rbf_register_size (rn);
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if (len != size)
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return -1;
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if (rn < 16)
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SETTWI (buf, m32rbf_h_gr_get (current_cpu, rn));
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else
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switch (rn)
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{
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case PSW_REGNUM :
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case CBR_REGNUM :
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case SPI_REGNUM :
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case SPU_REGNUM :
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case BPC_REGNUM :
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case BBPSW_REGNUM :
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case BBPC_REGNUM :
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SETTWI (buf, m32rbf_h_cr_get (current_cpu,
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m32r_decode_gdb_ctrl_regnum (rn)));
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break;
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case PC_REGNUM :
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SETTWI (buf, m32rbf_h_pc_get (current_cpu));
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break;
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case ACCL_REGNUM :
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SETTWI (buf, GETLODI (m32rbf_h_accum_get (current_cpu)));
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break;
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case ACCH_REGNUM :
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SETTWI (buf, GETHIDI (m32rbf_h_accum_get (current_cpu)));
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break;
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default :
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return 0;
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}
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return size;
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}
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/* The contents of BUF are in target byte order. */
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int
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m32rbf_store_register (SIM_CPU *current_cpu, int rn, const void *buf, int len)
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{
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int size = m32rbf_register_size (rn);
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if (len != size)
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return -1;
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if (rn < 16)
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m32rbf_h_gr_set (current_cpu, rn, GETTWI (buf));
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else
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switch (rn)
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{
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case PSW_REGNUM :
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case CBR_REGNUM :
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case SPI_REGNUM :
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case SPU_REGNUM :
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case BPC_REGNUM :
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case BBPSW_REGNUM :
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case BBPC_REGNUM :
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m32rbf_h_cr_set (current_cpu,
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m32r_decode_gdb_ctrl_regnum (rn),
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GETTWI (buf));
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break;
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case PC_REGNUM :
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m32rbf_h_pc_set (current_cpu, GETTWI (buf));
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break;
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case ACCL_REGNUM :
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{
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DI val = m32rbf_h_accum_get (current_cpu);
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SETLODI (val, GETTWI (buf));
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m32rbf_h_accum_set (current_cpu, val);
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break;
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}
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case ACCH_REGNUM :
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{
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DI val = m32rbf_h_accum_get (current_cpu);
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SETHIDI (val, GETTWI (buf));
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m32rbf_h_accum_set (current_cpu, val);
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break;
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}
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default :
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return 0;
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}
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return size;
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}
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USI
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m32rbf_h_cr_get_handler (SIM_CPU *current_cpu, UINT cr)
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{
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switch (cr)
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{
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case H_CR_PSW : /* psw */
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return (((CPU (h_bpsw) & 0xc1) << 8)
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| ((CPU (h_psw) & 0xc0) << 0)
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| GET_H_COND ());
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case H_CR_BBPSW : /* backup backup psw */
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return CPU (h_bbpsw) & 0xc1;
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case H_CR_CBR : /* condition bit */
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return GET_H_COND ();
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case H_CR_SPI : /* interrupt stack pointer */
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if (! GET_H_SM ())
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return CPU (h_gr[H_GR_SP]);
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else
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return CPU (h_cr[H_CR_SPI]);
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case H_CR_SPU : /* user stack pointer */
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if (GET_H_SM ())
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return CPU (h_gr[H_GR_SP]);
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else
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return CPU (h_cr[H_CR_SPU]);
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case H_CR_BPC : /* backup pc */
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return CPU (h_cr[H_CR_BPC]) & 0xfffffffe;
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case H_CR_BBPC : /* backup backup pc */
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return CPU (h_cr[H_CR_BBPC]) & 0xfffffffe;
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case 4 : /* ??? unspecified, but apparently available */
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case 5 : /* ??? unspecified, but apparently available */
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return CPU (h_cr[cr]);
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default :
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return 0;
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}
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}
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void
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m32rbf_h_cr_set_handler (SIM_CPU *current_cpu, UINT cr, USI newval)
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{
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switch (cr)
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{
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case H_CR_PSW : /* psw */
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{
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int old_sm = (CPU (h_psw) & 0x80) != 0;
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int new_sm = (newval & 0x80) != 0;
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CPU (h_bpsw) = (newval >> 8) & 0xff;
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CPU (h_psw) = newval & 0xff;
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SET_H_COND (newval & 1);
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/* When switching stack modes, update the registers. */
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if (old_sm != new_sm)
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{
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if (old_sm)
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{
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/* Switching user -> system. */
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CPU (h_cr[H_CR_SPU]) = CPU (h_gr[H_GR_SP]);
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CPU (h_gr[H_GR_SP]) = CPU (h_cr[H_CR_SPI]);
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}
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else
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{
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/* Switching system -> user. */
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CPU (h_cr[H_CR_SPI]) = CPU (h_gr[H_GR_SP]);
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CPU (h_gr[H_GR_SP]) = CPU (h_cr[H_CR_SPU]);
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}
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}
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break;
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}
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case H_CR_BBPSW : /* backup backup psw */
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CPU (h_bbpsw) = newval & 0xff;
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break;
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case H_CR_CBR : /* condition bit */
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SET_H_COND (newval & 1);
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break;
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case H_CR_SPI : /* interrupt stack pointer */
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if (! GET_H_SM ())
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CPU (h_gr[H_GR_SP]) = newval;
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else
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CPU (h_cr[H_CR_SPI]) = newval;
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break;
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case H_CR_SPU : /* user stack pointer */
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if (GET_H_SM ())
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CPU (h_gr[H_GR_SP]) = newval;
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else
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CPU (h_cr[H_CR_SPU]) = newval;
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break;
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case H_CR_BPC : /* backup pc */
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CPU (h_cr[H_CR_BPC]) = newval;
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break;
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case H_CR_BBPC : /* backup backup pc */
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CPU (h_cr[H_CR_BBPC]) = newval;
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break;
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case 4 : /* ??? unspecified, but apparently available */
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case 5 : /* ??? unspecified, but apparently available */
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CPU (h_cr[cr]) = newval;
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break;
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default :
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/* ignore */
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break;
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}
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}
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/* Cover fns to access h-psw. */
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UQI
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m32rbf_h_psw_get_handler (SIM_CPU *current_cpu)
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{
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return (CPU (h_psw) & 0xfe) | (CPU (h_cond) & 1);
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}
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void
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m32rbf_h_psw_set_handler (SIM_CPU *current_cpu, UQI newval)
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{
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CPU (h_psw) = newval;
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CPU (h_cond) = newval & 1;
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}
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/* Cover fns to access h-accum. */
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DI
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m32rbf_h_accum_get_handler (SIM_CPU *current_cpu)
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{
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/* Sign extend the top 8 bits. */
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DI r;
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#if 1
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r = ANDDI (CPU (h_accum), MAKEDI (0xffffff, 0xffffffff));
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r = XORDI (r, MAKEDI (0x800000, 0));
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r = SUBDI (r, MAKEDI (0x800000, 0));
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#else
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SI hi,lo;
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r = CPU (h_accum);
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hi = GETHIDI (r);
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lo = GETLODI (r);
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hi = ((hi & 0xffffff) ^ 0x800000) - 0x800000;
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r = MAKEDI (hi, lo);
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#endif
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return r;
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}
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void
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m32rbf_h_accum_set_handler (SIM_CPU *current_cpu, DI newval)
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{
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CPU (h_accum) = newval;
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}
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#if WITH_PROFILE_MODEL_P
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/* FIXME: Some of these should be inline or macros. Later. */
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/* Initialize cycle counting for an insn.
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FIRST_P is non-zero if this is the first insn in a set of parallel
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insns. */
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void
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m32rbf_model_insn_before (SIM_CPU *cpu, int first_p)
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{
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M32R_MISC_PROFILE *mp = CPU_M32R_MISC_PROFILE (cpu);
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mp->cti_stall = 0;
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mp->load_stall = 0;
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if (first_p)
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{
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mp->load_regs_pending = 0;
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mp->biggest_cycles = 0;
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}
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}
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/* Record the cycles computed for an insn.
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LAST_P is non-zero if this is the last insn in a set of parallel insns,
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and we update the total cycle count.
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CYCLES is the cycle count of the insn. */
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void
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m32rbf_model_insn_after (SIM_CPU *cpu, int last_p, int cycles)
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{
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PROFILE_DATA *p = CPU_PROFILE_DATA (cpu);
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M32R_MISC_PROFILE *mp = CPU_M32R_MISC_PROFILE (cpu);
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unsigned long total = cycles + mp->cti_stall + mp->load_stall;
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if (last_p)
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{
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unsigned long biggest = total > mp->biggest_cycles ? total : mp->biggest_cycles;
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PROFILE_MODEL_TOTAL_CYCLES (p) += biggest;
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PROFILE_MODEL_CUR_INSN_CYCLES (p) = total;
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}
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else
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{
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/* Here we take advantage of the fact that !last_p -> first_p. */
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mp->biggest_cycles = total;
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PROFILE_MODEL_CUR_INSN_CYCLES (p) = total;
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}
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/* Branch and load stall counts are recorded independently of the
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total cycle count. */
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PROFILE_MODEL_CTI_STALL_CYCLES (p) += mp->cti_stall;
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PROFILE_MODEL_LOAD_STALL_CYCLES (p) += mp->load_stall;
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mp->load_regs = mp->load_regs_pending;
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}
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static INLINE void
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check_load_stall (SIM_CPU *cpu, int regno)
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{
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UINT h_gr = CPU_M32R_MISC_PROFILE (cpu)->load_regs;
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if (regno != -1
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&& (h_gr & (1 << regno)) != 0)
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{
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CPU_M32R_MISC_PROFILE (cpu)->load_stall += 2;
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if (TRACE_INSN_P (cpu))
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cgen_trace_printf (cpu, " ; Load stall of 2 cycles.");
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}
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}
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int
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m32rbf_model_m32r_d_u_exec (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT sr, INT sr2, INT dr)
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{
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check_load_stall (cpu, sr);
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check_load_stall (cpu, sr2);
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_m32r_d_u_cmp (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT src1, INT src2)
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{
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check_load_stall (cpu, src1);
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check_load_stall (cpu, src2);
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_m32r_d_u_mac (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT src1, INT src2)
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{
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check_load_stall (cpu, src1);
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check_load_stall (cpu, src2);
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_m32r_d_u_cti (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT sr)
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{
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PROFILE_DATA *profile = CPU_PROFILE_DATA (cpu);
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int taken_p = (referenced & (1 << 1)) != 0;
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check_load_stall (cpu, sr);
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if (taken_p)
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{
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CPU_M32R_MISC_PROFILE (cpu)->cti_stall += 2;
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PROFILE_MODEL_TAKEN_COUNT (profile) += 1;
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}
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else
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PROFILE_MODEL_UNTAKEN_COUNT (profile) += 1;
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_m32r_d_u_load (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT sr, INT dr)
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{
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CPU_M32R_MISC_PROFILE (cpu)->load_regs_pending |= (1 << dr);
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check_load_stall (cpu, sr);
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_m32r_d_u_store (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced,
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INT src1, INT src2)
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{
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check_load_stall (cpu, src1);
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check_load_stall (cpu, src2);
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return idesc->timing->units[unit_num].done;
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}
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int
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m32rbf_model_test_u_exec (SIM_CPU *cpu, const IDESC *idesc,
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int unit_num, int referenced)
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{
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return idesc->timing->units[unit_num].done;
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}
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#endif /* WITH_PROFILE_MODEL_P */
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