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c906108c SS |
1 | /* i960 exception, interrupt, and trap (EIT) support |
2 | Copyright (C) 1998, 1999 Free Software Foundation, Inc. | |
3 | Contributed by Cygnus Solutions. | |
4 | ||
5 | This file is part of GDB, the GNU debugger. | |
6 | ||
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) | |
10 | any later version. | |
11 | ||
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. | |
16 | ||
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. */ | |
20 | ||
21 | #include "sim-main.h" | |
22 | #include "targ-vals.h" | |
23 | ||
24 | /* The semantic code invokes this for illegal (unrecognized) instructions. */ | |
25 | ||
26 | void | |
27 | sim_engine_invalid_insn (SIM_CPU *current_cpu, IADDR cia) | |
28 | { | |
29 | SIM_DESC sd = CPU_STATE (current_cpu); | |
30 | ||
31 | #if 0 | |
32 | if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) | |
33 | { | |
34 | h_bsm_set (current_cpu, h_sm_get (current_cpu)); | |
35 | h_bie_set (current_cpu, h_ie_get (current_cpu)); | |
36 | h_bcond_set (current_cpu, h_cond_get (current_cpu)); | |
37 | /* sm not changed */ | |
38 | h_ie_set (current_cpu, 0); | |
39 | h_cond_set (current_cpu, 0); | |
40 | ||
41 | h_bpc_set (current_cpu, cia); | |
42 | ||
43 | sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL, | |
44 | EIT_RSVD_INSN_ADDR); | |
45 | } | |
46 | else | |
47 | #endif | |
48 | sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL); | |
49 | } | |
50 | ||
51 | /* Process an address exception. */ | |
52 | ||
53 | void | |
54 | i960_core_signal (SIM_DESC sd, SIM_CPU *current_cpu, sim_cia cia, | |
55 | unsigned int map, int nr_bytes, address_word addr, | |
56 | transfer_type transfer, sim_core_signals sig) | |
57 | { | |
58 | #if 0 | |
59 | if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) | |
60 | { | |
61 | h_bsm_set (current_cpu, h_sm_get (current_cpu)); | |
62 | h_bie_set (current_cpu, h_ie_get (current_cpu)); | |
63 | h_bcond_set (current_cpu, h_cond_get (current_cpu)); | |
64 | /* sm not changed */ | |
65 | h_ie_set (current_cpu, 0); | |
66 | h_cond_set (current_cpu, 0); | |
67 | ||
68 | h_bpc_set (current_cpu, cia); | |
69 | ||
70 | sim_engine_restart (CPU_STATE (current_cpu), current_cpu, NULL, | |
71 | EIT_ADDR_EXCP_ADDR); | |
72 | } | |
73 | else | |
74 | #endif | |
75 | sim_core_signal (sd, current_cpu, cia, map, nr_bytes, addr, | |
76 | transfer, sig); | |
77 | } | |
78 | \f | |
79 | /* Read/write functions for system call interface. */ | |
80 | ||
81 | static int | |
82 | syscall_read_mem (host_callback *cb, struct cb_syscall *sc, | |
83 | unsigned long taddr, char *buf, int bytes) | |
84 | { | |
85 | SIM_DESC sd = (SIM_DESC) sc->p1; | |
86 | SIM_CPU *cpu = (SIM_CPU *) sc->p2; | |
87 | ||
88 | return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes); | |
89 | } | |
90 | ||
91 | static int | |
92 | syscall_write_mem (host_callback *cb, struct cb_syscall *sc, | |
93 | unsigned long taddr, const char *buf, int bytes) | |
94 | { | |
95 | SIM_DESC sd = (SIM_DESC) sc->p1; | |
96 | SIM_CPU *cpu = (SIM_CPU *) sc->p2; | |
97 | ||
98 | return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes); | |
99 | } | |
100 | ||
101 | /* Trap support. | |
102 | The result is the pc address to continue at. | |
103 | Preprocessing like saving the various registers has already been done. */ | |
104 | ||
105 | USI | |
106 | i960_trap (SIM_CPU *current_cpu, PCADDR pc, int num) | |
107 | { | |
108 | SIM_DESC sd = CPU_STATE (current_cpu); | |
109 | host_callback *cb = STATE_CALLBACK (sd); | |
110 | ||
111 | #ifdef SIM_HAVE_BREAKPOINTS | |
112 | /* Check for breakpoints "owned" by the simulator first, regardless | |
113 | of --environment. */ | |
114 | if (num == TRAP_BREAKPOINT) | |
115 | { | |
116 | /* First try sim-break.c. If it's a breakpoint the simulator "owns" | |
117 | it doesn't return. Otherwise it returns and let's us try. */ | |
118 | sim_handle_breakpoint (sd, current_cpu, pc); | |
119 | /* Fall through. */ | |
120 | } | |
121 | #endif | |
122 | ||
123 | #if 0 | |
124 | /* ??? wilson, don't know what this does. */ | |
125 | if (STATE_ENVIRONMENT (sd) == OPERATING_ENVIRONMENT) | |
126 | { | |
127 | /* The new pc is the trap vector entry. | |
128 | We assume there's a branch there to some handler. */ | |
129 | USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; | |
130 | return new_pc; | |
131 | } | |
132 | #endif | |
133 | ||
134 | switch (num) | |
135 | { | |
136 | default: | |
137 | case TRAP_SYSCALL : | |
138 | { | |
139 | CB_SYSCALL s; | |
140 | ||
141 | CB_SYSCALL_INIT (&s); | |
142 | s.func = num; | |
143 | s.arg1 = a_i960_h_gr_get (current_cpu, 16); | |
144 | s.arg2 = a_i960_h_gr_get (current_cpu, 17); | |
145 | s.arg3 = a_i960_h_gr_get (current_cpu, 18); | |
146 | ||
147 | if (s.func == TARGET_SYS_exit) | |
148 | { | |
149 | sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1); | |
150 | } | |
151 | ||
152 | s.p1 = (PTR) sd; | |
153 | s.p2 = (PTR) current_cpu; | |
154 | s.read_mem = syscall_read_mem; | |
155 | s.write_mem = syscall_write_mem; | |
156 | cb_syscall (cb, &s); | |
157 | /* ??? This stuff is probably wrong, but libgloss doesn't look at | |
158 | these values, so it shouldn't matter. */ | |
159 | a_i960_h_gr_set (current_cpu, 18, s.errcode); | |
160 | a_i960_h_gr_set (current_cpu, 16, s.result); | |
161 | a_i960_h_gr_set (current_cpu, 17, s.result2); | |
162 | break; | |
163 | } | |
164 | ||
165 | case TRAP_BREAKPOINT: | |
166 | sim_engine_halt (sd, current_cpu, NULL, NULL_CIA, | |
167 | sim_stopped, SIM_SIGTRAP); | |
168 | break; | |
169 | ||
170 | #if 0 | |
171 | /* ??? wilson, don't know what this does. */ | |
172 | default : | |
173 | { | |
174 | USI new_pc = EIT_TRAP_BASE_ADDR + num * 4; | |
175 | return new_pc; | |
176 | } | |
177 | #endif | |
178 | } | |
179 | ||
180 | /* Fake an "rte" insn. */ | |
181 | /* FIXME: Should duplicate all of rte processing. */ | |
182 | return (pc & -4) + 4; | |
183 | } | |
184 | ||
185 | /* Breakpoint support. | |
186 | The result is the pc address to continue at. */ | |
187 | /* ??? This is an editted copy of the above. */ | |
188 | ||
189 | USI | |
190 | i960_breakpoint (SIM_CPU *current_cpu, PCADDR pc) | |
191 | { | |
192 | SIM_DESC sd = CPU_STATE (current_cpu); | |
193 | host_callback *cb = STATE_CALLBACK (sd); | |
194 | ||
195 | #ifdef SIM_HAVE_BREAKPOINTS | |
196 | /* Check for breakpoints "owned" by the simulator first, regardless | |
197 | of --environment. */ | |
198 | if (num == TRAP_BREAKPOINT) | |
199 | { | |
200 | /* First try sim-break.c. If it's a breakpoint the simulator "owns" | |
201 | it doesn't return. Otherwise it returns and let's us try. */ | |
202 | sim_handle_breakpoint (sd, current_cpu, pc); | |
203 | /* Fall through. */ | |
204 | } | |
205 | #endif | |
206 | ||
207 | sim_engine_halt (sd, current_cpu, NULL, NULL_CIA, | |
208 | sim_stopped, SIM_SIGTRAP); | |
209 | ||
210 | /* Fake an "rte" insn. */ | |
211 | /* FIXME: Should duplicate all of rte processing. */ | |
212 | return (pc & -4) + 4; | |
213 | } |