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-rw-r--r--sim/fr30/traps.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/sim/fr30/traps.c b/sim/fr30/traps.c
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+/* fr30 exception, interrupt, and trap (EIT) support
+ Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+ Contributed by Cygnus Solutions.
+
+This file is part of the GNU simulators.
+
+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 2, 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, write to the Free Software Foundation, Inc.,
+59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "sim-main.h"
+#include "targ-vals.h"
+#include "cgen-engine.h"
+
+/* The semantic code invokes this for invalid (unrecognized) instructions. */
+
+void
+sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia)
+{
+ 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);
+}
+
+/* Process an address exception. */
+
+void
+fr30_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 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_ADDR_EXCP_ADDR);
+ }
+ else
+#endif
+ sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr,
+ transfer, sig);
+}
+
+/* Read/write functions for system call interface. */
+
+static int
+syscall_read_mem (host_callback *cb, struct cb_syscall *sc,
+ unsigned long taddr, char *buf, int bytes)
+{
+ SIM_DESC sd = (SIM_DESC) sc->p1;
+ SIM_CPU *cpu = (SIM_CPU *) sc->p2;
+
+ return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
+}
+
+static int
+syscall_write_mem (host_callback *cb, struct cb_syscall *sc,
+ unsigned long taddr, const char *buf, int bytes)
+{
+ SIM_DESC sd = (SIM_DESC) sc->p1;
+ SIM_CPU *cpu = (SIM_CPU *) sc->p2;
+
+ return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
+}
+
+/* Subroutine of fr30_int to save the PS and PC and setup for INT and INTE. */
+
+static void
+setup_int (SIM_CPU *current_cpu, PCADDR pc)
+{
+ USI ssp = a_fr30_h_dr_get (current_cpu, H_DR_SSP);
+ USI ps = a_fr30_h_ps_get (current_cpu);
+
+ ssp -= 4;
+ SETMEMSI (current_cpu, pc, ssp, ps);
+ ssp -= 4;
+ SETMEMSI (current_cpu, pc, ssp, pc + 2);
+ a_fr30_h_dr_set (current_cpu, H_DR_SSP, ssp);
+ a_fr30_h_sbit_set (current_cpu, 0);
+}
+
+/* Trap support.
+ The result is the pc address to continue at.
+ Preprocessing like saving the various registers has already been done. */
+
+USI
+fr30_int (SIM_CPU *current_cpu, PCADDR pc, int num)
+{
+ SIM_DESC sd = CPU_STATE (current_cpu);
+ host_callback *cb = STATE_CALLBACK (sd);
+
+#ifdef SIM_HAVE_BREAKPOINTS
+ /* Check for breakpoints "owned" by the simulator first, regardless
+ of --environment. */
+ if (num == TRAP_BREAKPOINT)
+ {
+ /* First try sim-break.c. If it's a breakpoint the simulator "owns"
+ it doesn't return. Otherwise it returns and let's us try. */
+ sim_handle_breakpoint (sd, current_cpu, pc);
+ /* Fall through. */
+ }
+#endif
+
+ if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
+ {
+ /* The new pc is the trap vector entry.
+ We assume there's a branch there to some handler. */
+ USI new_pc;
+ setup_int (current_cpu, pc);
+ a_fr30_h_ibit_set (current_cpu, 0);
+ new_pc = GETMEMSI (current_cpu, pc,
+ a_fr30_h_dr_get (current_cpu, H_DR_TBR)
+ + 1024 - ((num + 1) * 4));
+ return new_pc;
+ }
+
+ switch (num)
+ {
+ case TRAP_SYSCALL :
+ {
+ /* TODO: find out what the ABI for this is */
+ CB_SYSCALL s;
+
+ CB_SYSCALL_INIT (&s);
+ s.func = a_fr30_h_gr_get (current_cpu, 0);
+ s.arg1 = a_fr30_h_gr_get (current_cpu, 4);
+ s.arg2 = a_fr30_h_gr_get (current_cpu, 5);
+ s.arg3 = a_fr30_h_gr_get (current_cpu, 6);
+
+ if (s.func == TARGET_SYS_exit)
+ {
+ sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);
+ }
+
+ s.p1 = (PTR) sd;
+ s.p2 = (PTR) current_cpu;
+ s.read_mem = syscall_read_mem;
+ s.write_mem = syscall_write_mem;
+ cb_syscall (cb, &s);
+ a_fr30_h_gr_set (current_cpu, 2, s.errcode); /* TODO: check this one */
+ a_fr30_h_gr_set (current_cpu, 4, s.result);
+ a_fr30_h_gr_set (current_cpu, 1, s.result2); /* TODO: check this one */
+ break;
+ }
+
+ case TRAP_BREAKPOINT:
+ sim_engine_halt (sd, current_cpu, NULL, pc,
+ sim_stopped, SIM_SIGTRAP);
+ break;
+
+ default :
+ {
+ USI new_pc;
+ setup_int (current_cpu, pc);
+ a_fr30_h_ibit_set (current_cpu, 0);
+ new_pc = GETMEMSI (current_cpu, pc,
+ a_fr30_h_dr_get (current_cpu, H_DR_TBR)
+ + 1024 - ((num + 1) * 4));
+ return new_pc;
+ }
+ }
+
+ /* Fake an "reti" insn.
+ Since we didn't push anything to stack, all we need to do is
+ update pc. */
+ return pc + 2;
+}
+
+USI
+fr30_inte (SIM_CPU *current_cpu, PCADDR pc, int num)
+{
+ /* The new pc is the trap #9 vector entry.
+ We assume there's a branch there to some handler. */
+ USI new_pc;
+ setup_int (current_cpu, pc);
+ a_fr30_h_ilm_set (current_cpu, 4);
+ new_pc = GETMEMSI (current_cpu, pc,
+ a_fr30_h_dr_get (current_cpu, H_DR_TBR)
+ + 1024 - ((9 + 1) * 4));
+ return new_pc;
+}
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