1 /* m32r exception, interrupt, and trap (EIT) support
2 Copyright (C) 1998 Free Software Foundation, Inc.
3 Contributed by Cygnus Solutions.
5 This file is part of GDB, the GNU debugger.
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"
24 /* The semantic code invokes this for invalid (unrecognized) instructions.
25 CIA is the address with the invalid insn.
26 VPC is the virtual pc of the following insn. */
29 sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia, SEM_PC vpc)
31 SIM_DESC sd = CPU_STATE (current_cpu);
34 if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
36 h_bsm_set (current_cpu, h_sm_get (current_cpu));
37 h_bie_set (current_cpu, h_ie_get (current_cpu));
38 h_bcond_set (current_cpu, h_cond_get (current_cpu));
40 h_ie_set (current_cpu, 0);
41 h_cond_set (current_cpu, 0);
43 h_bpc_set (current_cpu, cia);
45 sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
50 sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL);
54 /* Process an address exception. */
57 m32r_core_signal (SIM_DESC sd, SIM_CPU *current_cpu, sim_cia cia,
58 unsigned int map, int nr_bytes, address_word addr,
59 transfer_type transfer, sim_core_signals sig)
61 if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
63 a_m32r_h_cr_set (current_cpu, H_CR_BBPC,
64 a_m32r_h_cr_get (current_cpu, H_CR_BPC));
65 if (MACH_NUM (CPU_MACH (current_cpu)) == MACH_M32R)
67 m32rbf_h_bpsw_set (current_cpu, m32rbf_h_psw_get (current_cpu));
69 m32rbf_h_psw_set (current_cpu, m32rbf_h_psw_get (current_cpu) & 0x80);
73 m32rxf_h_bpsw_set (current_cpu, m32rxf_h_psw_get (current_cpu));
75 m32rxf_h_psw_set (current_cpu, m32rxf_h_psw_get (current_cpu) & 0x80);
77 a_m32r_h_cr_set (current_cpu, H_CR_BPC, cia);
79 sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL,
83 sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr,
87 /* Read/write functions for system call interface. */
90 syscall_read_mem (host_callback *cb, struct cb_syscall *sc,
91 unsigned long taddr, char *buf, int bytes)
93 SIM_DESC sd = (SIM_DESC) sc->p1;
94 SIM_CPU *cpu = (SIM_CPU *) sc->p2;
96 return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
100 syscall_write_mem (host_callback *cb, struct cb_syscall *sc,
101 unsigned long taddr, const char *buf, int bytes)
103 SIM_DESC sd = (SIM_DESC) sc->p1;
104 SIM_CPU *cpu = (SIM_CPU *) sc->p2;
106 return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
110 The result is the pc address to continue at.
111 Preprocessing like saving the various registers has already been done. */
114 m32r_trap (SIM_CPU *current_cpu, PCADDR pc, int num)
116 SIM_DESC sd = CPU_STATE (current_cpu);
117 host_callback *cb = STATE_CALLBACK (sd);
119 #ifdef SIM_HAVE_BREAKPOINTS
120 /* Check for breakpoints "owned" by the simulator first, regardless
122 if (num == TRAP_BREAKPOINT)
124 /* First try sim-break.c. If it's a breakpoint the simulator "owns"
125 it doesn't return. Otherwise it returns and let's us try. */
126 sim_handle_breakpoint (sd, current_cpu, pc);
131 if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT)
133 /* The new pc is the trap vector entry.
134 We assume there's a branch there to some handler. */
135 USI new_pc = EIT_TRAP_BASE_ADDR + num * 4;
145 CB_SYSCALL_INIT (&s);
146 s.func = a_m32r_h_gr_get (current_cpu, 0);
147 s.arg1 = a_m32r_h_gr_get (current_cpu, 1);
148 s.arg2 = a_m32r_h_gr_get (current_cpu, 2);
149 s.arg3 = a_m32r_h_gr_get (current_cpu, 3);
151 if (s.func == TARGET_SYS_exit)
153 sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);
157 s.p2 = (PTR) current_cpu;
158 s.read_mem = syscall_read_mem;
159 s.write_mem = syscall_write_mem;
161 a_m32r_h_gr_set (current_cpu, 2, s.errcode);
162 a_m32r_h_gr_set (current_cpu, 0, s.result);
163 a_m32r_h_gr_set (current_cpu, 1, s.result2);
167 case TRAP_BREAKPOINT:
168 sim_engine_halt (sd, current_cpu, NULL, pc,
169 sim_stopped, SIM_SIGTRAP);
174 USI new_pc = EIT_TRAP_BASE_ADDR + num * 4;
179 /* Fake an "rte" insn. */
180 /* FIXME: Should duplicate all of rte processing. */
181 return (pc & -4) + 4;