1 /*
2 * qemu user cpu loop
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "qemu-common.h"
22 #include "qemu.h"
23 #include "user-internals.h"
24 #include "cpu_loop-common.h"
25 #include "signal-common.h"
26
cpu_loop(CPUAlphaState * env)27 void cpu_loop(CPUAlphaState *env)
28 {
29 CPUState *cs = env_cpu(env);
30 int trapnr;
31 target_siginfo_t info;
32 abi_long sysret;
33
34 while (1) {
35 bool arch_interrupt = true;
36
37 cpu_exec_start(cs);
38 trapnr = cpu_exec(cs);
39 cpu_exec_end(cs);
40 process_queued_cpu_work(cs);
41
42 switch (trapnr) {
43 case EXCP_RESET:
44 fprintf(stderr, "Reset requested. Exit\n");
45 exit(EXIT_FAILURE);
46 break;
47 case EXCP_MCHK:
48 fprintf(stderr, "Machine check exception. Exit\n");
49 exit(EXIT_FAILURE);
50 break;
51 case EXCP_SMP_INTERRUPT:
52 case EXCP_CLK_INTERRUPT:
53 case EXCP_DEV_INTERRUPT:
54 fprintf(stderr, "External interrupt. Exit\n");
55 exit(EXIT_FAILURE);
56 break;
57 case EXCP_MMFAULT:
58 info.si_signo = TARGET_SIGSEGV;
59 info.si_errno = 0;
60 info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID
61 ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR);
62 info._sifields._sigfault._addr = env->trap_arg0;
63 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
64 break;
65 case EXCP_UNALIGN:
66 info.si_signo = TARGET_SIGBUS;
67 info.si_errno = 0;
68 info.si_code = TARGET_BUS_ADRALN;
69 info._sifields._sigfault._addr = env->trap_arg0;
70 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
71 break;
72 case EXCP_OPCDEC:
73 do_sigill:
74 info.si_signo = TARGET_SIGILL;
75 info.si_errno = 0;
76 info.si_code = TARGET_ILL_ILLOPC;
77 info._sifields._sigfault._addr = env->pc;
78 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
79 break;
80 case EXCP_ARITH:
81 info.si_signo = TARGET_SIGFPE;
82 info.si_errno = 0;
83 info.si_code = TARGET_FPE_FLTINV;
84 info._sifields._sigfault._addr = env->pc;
85 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
86 break;
87 case EXCP_FEN:
88 /* No-op. Linux simply re-enables the FPU. */
89 break;
90 case EXCP_CALL_PAL:
91 switch (env->error_code) {
92 case 0x80:
93 /* BPT */
94 info.si_signo = TARGET_SIGTRAP;
95 info.si_errno = 0;
96 info.si_code = TARGET_TRAP_BRKPT;
97 info._sifields._sigfault._addr = env->pc;
98 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
99 break;
100 case 0x81:
101 /* BUGCHK */
102 info.si_signo = TARGET_SIGTRAP;
103 info.si_errno = 0;
104 info.si_code = 0;
105 info._sifields._sigfault._addr = env->pc;
106 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
107 break;
108 case 0x83:
109 /* CALLSYS */
110 trapnr = env->ir[IR_V0];
111 sysret = do_syscall(env, trapnr,
112 env->ir[IR_A0], env->ir[IR_A1],
113 env->ir[IR_A2], env->ir[IR_A3],
114 env->ir[IR_A4], env->ir[IR_A5],
115 0, 0);
116 if (sysret == -TARGET_ERESTARTSYS) {
117 env->pc -= 4;
118 break;
119 }
120 if (sysret == -TARGET_QEMU_ESIGRETURN) {
121 break;
122 }
123 /* Syscall writes 0 to V0 to bypass error check, similar
124 to how this is handled internal to Linux kernel.
125 (Ab)use trapnr temporarily as boolean indicating error. */
126 trapnr = (env->ir[IR_V0] != 0 && sysret < 0);
127 env->ir[IR_V0] = (trapnr ? -sysret : sysret);
128 env->ir[IR_A3] = trapnr;
129 break;
130 case 0x86:
131 /* IMB */
132 /* ??? We can probably elide the code using page_unprotect
133 that is checking for self-modifying code. Instead we
134 could simply call tb_flush here. Until we work out the
135 changes required to turn off the extra write protection,
136 this can be a no-op. */
137 break;
138 case 0x9E:
139 /* RDUNIQUE */
140 /* Handled in the translator for usermode. */
141 abort();
142 case 0x9F:
143 /* WRUNIQUE */
144 /* Handled in the translator for usermode. */
145 abort();
146 case 0xAA:
147 /* GENTRAP */
148 info.si_signo = TARGET_SIGFPE;
149 switch (env->ir[IR_A0]) {
150 case TARGET_GEN_INTOVF:
151 info.si_code = TARGET_FPE_INTOVF;
152 break;
153 case TARGET_GEN_INTDIV:
154 info.si_code = TARGET_FPE_INTDIV;
155 break;
156 case TARGET_GEN_FLTOVF:
157 info.si_code = TARGET_FPE_FLTOVF;
158 break;
159 case TARGET_GEN_FLTUND:
160 info.si_code = TARGET_FPE_FLTUND;
161 break;
162 case TARGET_GEN_FLTINV:
163 info.si_code = TARGET_FPE_FLTINV;
164 break;
165 case TARGET_GEN_FLTINE:
166 info.si_code = TARGET_FPE_FLTRES;
167 break;
168 case TARGET_GEN_ROPRAND:
169 info.si_code = 0;
170 break;
171 default:
172 info.si_signo = TARGET_SIGTRAP;
173 info.si_code = 0;
174 break;
175 }
176 info.si_errno = 0;
177 info._sifields._sigfault._addr = env->pc;
178 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
179 break;
180 default:
181 goto do_sigill;
182 }
183 break;
184 case EXCP_DEBUG:
185 info.si_signo = TARGET_SIGTRAP;
186 info.si_errno = 0;
187 info.si_code = TARGET_TRAP_BRKPT;
188 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
189 break;
190 case EXCP_INTERRUPT:
191 /* Just indicate that signals should be handled asap. */
192 break;
193 case EXCP_ATOMIC:
194 cpu_exec_step_atomic(cs);
195 arch_interrupt = false;
196 break;
197 default:
198 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
199 cpu_dump_state(cs, stderr, 0);
200 exit(EXIT_FAILURE);
201 }
202 process_pending_signals (env);
203
204 /* Most of the traps imply a transition through PALcode, which
205 implies an REI instruction has been executed. Which means
206 that RX and LOCK_ADDR should be cleared. But there are a
207 few exceptions for traps internal to QEMU. */
208 if (arch_interrupt) {
209 env->flags &= ~ENV_FLAG_RX_FLAG;
210 env->lock_addr = -1;
211 }
212 }
213 }
214
target_cpu_copy_regs(CPUArchState * env,struct target_pt_regs * regs)215 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
216 {
217 int i;
218
219 for(i = 0; i < 28; i++) {
220 env->ir[i] = ((abi_ulong *)regs)[i];
221 }
222 env->ir[IR_SP] = regs->usp;
223 env->pc = regs->pc;
224 }
225