Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-virtiofs-20210506...
[qemu.git] / linux-user / alpha / cpu_loop.c
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 "cpu_loop-common.h"
24
25 void cpu_loop(CPUAlphaState *env)
26 {
27 CPUState *cs = env_cpu(env);
28 int trapnr;
29 target_siginfo_t info;
30 abi_long sysret;
31
32 while (1) {
33 bool arch_interrupt = true;
34
35 cpu_exec_start(cs);
36 trapnr = cpu_exec(cs);
37 cpu_exec_end(cs);
38 process_queued_cpu_work(cs);
39
40 switch (trapnr) {
41 case EXCP_RESET:
42 fprintf(stderr, "Reset requested. Exit\n");
43 exit(EXIT_FAILURE);
44 break;
45 case EXCP_MCHK:
46 fprintf(stderr, "Machine check exception. Exit\n");
47 exit(EXIT_FAILURE);
48 break;
49 case EXCP_SMP_INTERRUPT:
50 case EXCP_CLK_INTERRUPT:
51 case EXCP_DEV_INTERRUPT:
52 fprintf(stderr, "External interrupt. Exit\n");
53 exit(EXIT_FAILURE);
54 break;
55 case EXCP_MMFAULT:
56 info.si_signo = TARGET_SIGSEGV;
57 info.si_errno = 0;
58 info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID
59 ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR);
60 info._sifields._sigfault._addr = env->trap_arg0;
61 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
62 break;
63 case EXCP_UNALIGN:
64 info.si_signo = TARGET_SIGBUS;
65 info.si_errno = 0;
66 info.si_code = TARGET_BUS_ADRALN;
67 info._sifields._sigfault._addr = env->trap_arg0;
68 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
69 break;
70 case EXCP_OPCDEC:
71 do_sigill:
72 info.si_signo = TARGET_SIGILL;
73 info.si_errno = 0;
74 info.si_code = TARGET_ILL_ILLOPC;
75 info._sifields._sigfault._addr = env->pc;
76 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
77 break;
78 case EXCP_ARITH:
79 info.si_signo = TARGET_SIGFPE;
80 info.si_errno = 0;
81 info.si_code = TARGET_FPE_FLTINV;
82 info._sifields._sigfault._addr = env->pc;
83 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
84 break;
85 case EXCP_FEN:
86 /* No-op. Linux simply re-enables the FPU. */
87 break;
88 case EXCP_CALL_PAL:
89 switch (env->error_code) {
90 case 0x80:
91 /* BPT */
92 info.si_signo = TARGET_SIGTRAP;
93 info.si_errno = 0;
94 info.si_code = TARGET_TRAP_BRKPT;
95 info._sifields._sigfault._addr = env->pc;
96 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
97 break;
98 case 0x81:
99 /* BUGCHK */
100 info.si_signo = TARGET_SIGTRAP;
101 info.si_errno = 0;
102 info.si_code = 0;
103 info._sifields._sigfault._addr = env->pc;
104 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
105 break;
106 case 0x83:
107 /* CALLSYS */
108 trapnr = env->ir[IR_V0];
109 sysret = do_syscall(env, trapnr,
110 env->ir[IR_A0], env->ir[IR_A1],
111 env->ir[IR_A2], env->ir[IR_A3],
112 env->ir[IR_A4], env->ir[IR_A5],
113 0, 0);
114 if (sysret == -TARGET_ERESTARTSYS) {
115 env->pc -= 4;
116 break;
117 }
118 if (sysret == -TARGET_QEMU_ESIGRETURN) {
119 break;
120 }
121 /* Syscall writes 0 to V0 to bypass error check, similar
122 to how this is handled internal to Linux kernel.
123 (Ab)use trapnr temporarily as boolean indicating error. */
124 trapnr = (env->ir[IR_V0] != 0 && sysret < 0);
125 env->ir[IR_V0] = (trapnr ? -sysret : sysret);
126 env->ir[IR_A3] = trapnr;
127 break;
128 case 0x86:
129 /* IMB */
130 /* ??? We can probably elide the code using page_unprotect
131 that is checking for self-modifying code. Instead we
132 could simply call tb_flush here. Until we work out the
133 changes required to turn off the extra write protection,
134 this can be a no-op. */
135 break;
136 case 0x9E:
137 /* RDUNIQUE */
138 /* Handled in the translator for usermode. */
139 abort();
140 case 0x9F:
141 /* WRUNIQUE */
142 /* Handled in the translator for usermode. */
143 abort();
144 case 0xAA:
145 /* GENTRAP */
146 info.si_signo = TARGET_SIGFPE;
147 switch (env->ir[IR_A0]) {
148 case TARGET_GEN_INTOVF:
149 info.si_code = TARGET_FPE_INTOVF;
150 break;
151 case TARGET_GEN_INTDIV:
152 info.si_code = TARGET_FPE_INTDIV;
153 break;
154 case TARGET_GEN_FLTOVF:
155 info.si_code = TARGET_FPE_FLTOVF;
156 break;
157 case TARGET_GEN_FLTUND:
158 info.si_code = TARGET_FPE_FLTUND;
159 break;
160 case TARGET_GEN_FLTINV:
161 info.si_code = TARGET_FPE_FLTINV;
162 break;
163 case TARGET_GEN_FLTINE:
164 info.si_code = TARGET_FPE_FLTRES;
165 break;
166 case TARGET_GEN_ROPRAND:
167 info.si_code = 0;
168 break;
169 default:
170 info.si_signo = TARGET_SIGTRAP;
171 info.si_code = 0;
172 break;
173 }
174 info.si_errno = 0;
175 info._sifields._sigfault._addr = env->pc;
176 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
177 break;
178 default:
179 goto do_sigill;
180 }
181 break;
182 case EXCP_DEBUG:
183 info.si_signo = TARGET_SIGTRAP;
184 info.si_errno = 0;
185 info.si_code = TARGET_TRAP_BRKPT;
186 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
187 break;
188 case EXCP_INTERRUPT:
189 /* Just indicate that signals should be handled asap. */
190 break;
191 case EXCP_ATOMIC:
192 cpu_exec_step_atomic(cs);
193 arch_interrupt = false;
194 break;
195 default:
196 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
197 cpu_dump_state(cs, stderr, 0);
198 exit(EXIT_FAILURE);
199 }
200 process_pending_signals (env);
201
202 /* Most of the traps imply a transition through PALcode, which
203 implies an REI instruction has been executed. Which means
204 that RX and LOCK_ADDR should be cleared. But there are a
205 few exceptions for traps internal to QEMU. */
206 if (arch_interrupt) {
207 env->flags &= ~ENV_FLAG_RX_FLAG;
208 env->lock_addr = -1;
209 }
210 }
211 }
212
213 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
214 {
215 int i;
216
217 for(i = 0; i < 28; i++) {
218 env->ir[i] = ((abi_ulong *)regs)[i];
219 }
220 env->ir[IR_SP] = regs->usp;
221 env->pc = regs->pc;
222 }