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/* m32r exception, interrupt, and trap (EIT) support
Copyright (C) 1998-2021 Free Software Foundation, Inc.
Contributed by Cygnus Solutions.
This file is part of GDB, the GNU debugger.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "sim-main.h"
#include "sim-syscall.h"
#include "targ-vals.h"
#define TRAP_FLUSH_CACHE 12
/* The semantic code invokes this for invalid (unrecognized) instructions. */
SEM_PC
sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia, SEM_PC pc)
{
SIM_DESC sd = CPU_STATE (current_cpu);
#if 0
if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
{
h_bsm_set (current_cpu, h_sm_get (current_cpu));
h_bie_set (current_cpu, h_ie_get (current_cpu));
h_bcond_set (current_cpu, h_cond_get (current_cpu));
/* sm not changed */
h_ie_set (current_cpu, 0);
h_cond_set (current_cpu, 0);
h_bpc_set (current_cpu, cia);
sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
EIT_RSVD_INSN_ADDR);
}
else
#endif
sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL);
return pc;
}
/* Process an address exception. */
void
m32r_core_signal (SIM_DESC sd, SIM_CPU *current_cpu, sim_cia cia,
unsigned int map, int nr_bytes, address_word addr,
transfer_type transfer, sim_core_signals sig)
{
if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
{
m32rbf_h_cr_set (current_cpu, H_CR_BBPC,
m32rbf_h_cr_get (current_cpu, H_CR_BPC));
switch (MACH_NUM (CPU_MACH (current_cpu)))
{
case MACH_M32R:
m32rbf_h_bpsw_set (current_cpu, m32rbf_h_psw_get (current_cpu));
/* sm not changed. */
m32rbf_h_psw_set (current_cpu, m32rbf_h_psw_get (current_cpu) & 0x80);
break;
case MACH_M32RX:
m32rxf_h_bpsw_set (current_cpu, m32rxf_h_psw_get (current_cpu));
/* sm not changed. */
m32rxf_h_psw_set (current_cpu, m32rxf_h_psw_get (current_cpu) & 0x80);
break;
case MACH_M32R2:
m32r2f_h_bpsw_set (current_cpu, m32r2f_h_psw_get (current_cpu));
/* sm not changed. */
m32r2f_h_psw_set (current_cpu, m32r2f_h_psw_get (current_cpu) & 0x80);
break;
default:
abort ();
}
m32rbf_h_cr_set (current_cpu, H_CR_BPC, cia);
sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
EIT_ADDR_EXCP_ADDR);
}
else
sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr,
transfer, sig);
}
/* Trap support.
The result is the pc address to continue at.
Preprocessing like saving the various registers has already been done. */
USI
m32r_trap (SIM_CPU *current_cpu, PCADDR pc, int num)
{
SIM_DESC sd = CPU_STATE (current_cpu);
host_callback *cb = STATE_CALLBACK (sd);
if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
{
/* The new pc is the trap vector entry.
We assume there's a branch there to some handler.
Use cr5 as EVB (EIT Vector Base) register. */
/* USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; */
USI new_pc = m32rbf_h_cr_get (current_cpu, 5) + 0x40 + num * 4;
return new_pc;
}
switch (num)
{
case TRAP_SYSCALL :
{
long result, result2;
int errcode;
sim_syscall_multi (current_cpu,
m32rbf_h_gr_get (current_cpu, 0),
m32rbf_h_gr_get (current_cpu, 1),
m32rbf_h_gr_get (current_cpu, 2),
m32rbf_h_gr_get (current_cpu, 3),
m32rbf_h_gr_get (current_cpu, 4),
&result, &result2, &errcode);
m32rbf_h_gr_set (current_cpu, 2, errcode);
m32rbf_h_gr_set (current_cpu, 0, result);
m32rbf_h_gr_set (current_cpu, 1, result2);
break;
}
case TRAP_BREAKPOINT:
sim_engine_halt (sd, current_cpu, NULL, pc,
sim_stopped, SIM_SIGTRAP);
break;
case TRAP_FLUSH_CACHE:
/* Do nothing. */
break;
default :
{
/* USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; */
/* Use cr5 as EVB (EIT Vector Base) register. */
USI new_pc = m32rbf_h_cr_get (current_cpu, 5) + 0x40 + num * 4;
return new_pc;
}
}
/* Fake an "rte" insn. */
/* FIXME: Should duplicate all of rte processing. */
return (pc & -4) + 4;
}
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