1 /* fr30 exception, interrupt, and trap (EIT) support
2 Copyright (C) 1998, 1999 Free Software Foundation, Inc.
3 Contributed by Cygnus Solutions.
5 This file is part of the GNU simulators.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "targ-vals.h"
23 #include "cgen-engine.h"
25 /* The semantic code invokes this for invalid (unrecognized) instructions. */
28 sim_engine_invalid_insn (SIM_CPU
*current_cpu
, IADDR cia
, SEM_PC vpc
)
30 SIM_DESC sd
= CPU_STATE (current_cpu
);
33 if (STATE_ENVIRONMENT (sd
) == OPERATING_ENVIRONMENT
)
35 h_bsm_set (current_cpu
, h_sm_get (current_cpu
));
36 h_bie_set (current_cpu
, h_ie_get (current_cpu
));
37 h_bcond_set (current_cpu
, h_cond_get (current_cpu
));
39 h_ie_set (current_cpu
, 0);
40 h_cond_set (current_cpu
, 0);
42 h_bpc_set (current_cpu
, cia
);
44 sim_engine_restart (CPU_STATE (current_cpu
), current_cpu
, NULL
,
49 sim_engine_halt (sd
, current_cpu
, NULL
, cia
, sim_stopped
, SIM_SIGILL
);
53 /* Process an address exception. */
56 fr30_core_signal (SIM_DESC sd
, SIM_CPU
*current_cpu
, sim_cia cia
,
57 unsigned int map
, int nr_bytes
, address_word addr
,
58 transfer_type transfer
, sim_core_signals sig
)
61 if (STATE_ENVIRONMENT (sd
) == OPERATING_ENVIRONMENT
)
63 h_bsm_set (current_cpu
, h_sm_get (current_cpu
));
64 h_bie_set (current_cpu
, h_ie_get (current_cpu
));
65 h_bcond_set (current_cpu
, h_cond_get (current_cpu
));
67 h_ie_set (current_cpu
, 0);
68 h_cond_set (current_cpu
, 0);
70 h_bpc_set (current_cpu
, cia
);
72 sim_engine_restart (CPU_STATE (current_cpu
), current_cpu
, NULL
,
77 sim_core_signal (sd
, current_cpu
, cia
, map
, nr_bytes
, addr
,
81 /* Read/write functions for system call interface. */
84 syscall_read_mem (host_callback
*cb
, struct cb_syscall
*sc
,
85 unsigned long taddr
, char *buf
, int bytes
)
87 SIM_DESC sd
= (SIM_DESC
) sc
->p1
;
88 SIM_CPU
*cpu
= (SIM_CPU
*) sc
->p2
;
90 return sim_core_read_buffer (sd
, cpu
, read_map
, buf
, taddr
, bytes
);
94 syscall_write_mem (host_callback
*cb
, struct cb_syscall
*sc
,
95 unsigned long taddr
, const char *buf
, int bytes
)
97 SIM_DESC sd
= (SIM_DESC
) sc
->p1
;
98 SIM_CPU
*cpu
= (SIM_CPU
*) sc
->p2
;
100 return sim_core_write_buffer (sd
, cpu
, write_map
, buf
, taddr
, bytes
);
103 /* Subroutine of fr30_int to save the PS and PC and setup for INT and INTE. */
106 setup_int (SIM_CPU
*current_cpu
, PCADDR pc
)
108 USI ssp
= fr30bf_h_dr_get (current_cpu
, H_DR_SSP
);
109 USI ps
= fr30bf_h_ps_get (current_cpu
);
112 SETMEMSI (current_cpu
, pc
, ssp
, ps
);
114 SETMEMSI (current_cpu
, pc
, ssp
, pc
+ 2);
115 fr30bf_h_dr_set (current_cpu
, H_DR_SSP
, ssp
);
116 fr30bf_h_sbit_set (current_cpu
, 0);
120 The result is the pc address to continue at.
121 Preprocessing like saving the various registers has already been done. */
124 fr30_int (SIM_CPU
*current_cpu
, PCADDR pc
, int num
)
126 SIM_DESC sd
= CPU_STATE (current_cpu
);
127 host_callback
*cb
= STATE_CALLBACK (sd
);
129 #ifdef SIM_HAVE_BREAKPOINTS
130 /* Check for breakpoints "owned" by the simulator first, regardless
132 if (num
== TRAP_BREAKPOINT
)
134 /* First try sim-break.c. If it's a breakpoint the simulator "owns"
135 it doesn't return. Otherwise it returns and let's us try. */
136 sim_handle_breakpoint (sd
, current_cpu
, pc
);
141 if (STATE_ENVIRONMENT (sd
) == OPERATING_ENVIRONMENT
)
143 /* The new pc is the trap vector entry.
144 We assume there's a branch there to some handler. */
146 setup_int (current_cpu
, pc
);
147 fr30bf_h_ibit_set (current_cpu
, 0);
148 new_pc
= GETMEMSI (current_cpu
, pc
,
149 fr30bf_h_dr_get (current_cpu
, H_DR_TBR
)
150 + 1024 - ((num
+ 1) * 4));
158 /* TODO: find out what the ABI for this is */
161 CB_SYSCALL_INIT (&s
);
162 s
.func
= fr30bf_h_gr_get (current_cpu
, 0);
163 s
.arg1
= fr30bf_h_gr_get (current_cpu
, 4);
164 s
.arg2
= fr30bf_h_gr_get (current_cpu
, 5);
165 s
.arg3
= fr30bf_h_gr_get (current_cpu
, 6);
167 if (s
.func
== TARGET_SYS_exit
)
169 sim_engine_halt (sd
, current_cpu
, NULL
, pc
, sim_exited
, s
.arg1
);
173 s
.p2
= (PTR
) current_cpu
;
174 s
.read_mem
= syscall_read_mem
;
175 s
.write_mem
= syscall_write_mem
;
177 fr30bf_h_gr_set (current_cpu
, 2, s
.errcode
); /* TODO: check this one */
178 fr30bf_h_gr_set (current_cpu
, 4, s
.result
);
179 fr30bf_h_gr_set (current_cpu
, 1, s
.result2
); /* TODO: check this one */
183 case TRAP_BREAKPOINT
:
184 sim_engine_halt (sd
, current_cpu
, NULL
, pc
,
185 sim_stopped
, SIM_SIGTRAP
);
191 setup_int (current_cpu
, pc
);
192 fr30bf_h_ibit_set (current_cpu
, 0);
193 new_pc
= GETMEMSI (current_cpu
, pc
,
194 fr30bf_h_dr_get (current_cpu
, H_DR_TBR
)
195 + 1024 - ((num
+ 1) * 4));
200 /* Fake an "reti" insn.
201 Since we didn't push anything to stack, all we need to do is
207 fr30_inte (SIM_CPU
*current_cpu
, PCADDR pc
, int num
)
209 /* The new pc is the trap #9 vector entry.
210 We assume there's a branch there to some handler. */
212 setup_int (current_cpu
, pc
);
213 fr30bf_h_ilm_set (current_cpu
, 4);
214 new_pc
= GETMEMSI (current_cpu
, pc
,
215 fr30bf_h_dr_get (current_cpu
, H_DR_TBR
)
216 + 1024 - ((9 + 1) * 4));
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