pnv: Clean up cpu realize path
[qemu/rayw.git] / linux-user / alpha / cpu_loop.c
blobb87fcaea87daf0a727dcdba6157a5d3d3705a43a
1 /*
2 * qemu user cpu loop
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
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.
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/>.
20 #include "qemu/osdep.h"
21 #include "qemu.h"
22 #include "cpu_loop-common.h"
24 void cpu_loop(CPUAlphaState *env)
26 CPUState *cs = CPU(alpha_env_get_cpu(env));
27 int trapnr;
28 target_siginfo_t info;
29 abi_long sysret;
31 while (1) {
32 bool arch_interrupt = true;
34 cpu_exec_start(cs);
35 trapnr = cpu_exec(cs);
36 cpu_exec_end(cs);
37 process_queued_cpu_work(cs);
39 switch (trapnr) {
40 case EXCP_RESET:
41 fprintf(stderr, "Reset requested. Exit\n");
42 exit(EXIT_FAILURE);
43 break;
44 case EXCP_MCHK:
45 fprintf(stderr, "Machine check exception. Exit\n");
46 exit(EXIT_FAILURE);
47 break;
48 case EXCP_SMP_INTERRUPT:
49 case EXCP_CLK_INTERRUPT:
50 case EXCP_DEV_INTERRUPT:
51 fprintf(stderr, "External interrupt. Exit\n");
52 exit(EXIT_FAILURE);
53 break;
54 case EXCP_MMFAULT:
55 info.si_signo = TARGET_SIGSEGV;
56 info.si_errno = 0;
57 info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID
58 ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR);
59 info._sifields._sigfault._addr = env->trap_arg0;
60 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
61 break;
62 case EXCP_UNALIGN:
63 info.si_signo = TARGET_SIGBUS;
64 info.si_errno = 0;
65 info.si_code = TARGET_BUS_ADRALN;
66 info._sifields._sigfault._addr = env->trap_arg0;
67 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
68 break;
69 case EXCP_OPCDEC:
70 do_sigill:
71 info.si_signo = TARGET_SIGILL;
72 info.si_errno = 0;
73 info.si_code = TARGET_ILL_ILLOPC;
74 info._sifields._sigfault._addr = env->pc;
75 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
76 break;
77 case EXCP_ARITH:
78 info.si_signo = TARGET_SIGFPE;
79 info.si_errno = 0;
80 info.si_code = TARGET_FPE_FLTINV;
81 info._sifields._sigfault._addr = env->pc;
82 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
83 break;
84 case EXCP_FEN:
85 /* No-op. Linux simply re-enables the FPU. */
86 break;
87 case EXCP_CALL_PAL:
88 switch (env->error_code) {
89 case 0x80:
90 /* BPT */
91 info.si_signo = TARGET_SIGTRAP;
92 info.si_errno = 0;
93 info.si_code = TARGET_TRAP_BRKPT;
94 info._sifields._sigfault._addr = env->pc;
95 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
96 break;
97 case 0x81:
98 /* BUGCHK */
99 info.si_signo = TARGET_SIGTRAP;
100 info.si_errno = 0;
101 info.si_code = 0;
102 info._sifields._sigfault._addr = env->pc;
103 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
104 break;
105 case 0x83:
106 /* CALLSYS */
107 trapnr = env->ir[IR_V0];
108 sysret = do_syscall(env, trapnr,
109 env->ir[IR_A0], env->ir[IR_A1],
110 env->ir[IR_A2], env->ir[IR_A3],
111 env->ir[IR_A4], env->ir[IR_A5],
112 0, 0);
113 if (sysret == -TARGET_ERESTARTSYS) {
114 env->pc -= 4;
115 break;
117 if (sysret == -TARGET_QEMU_ESIGRETURN) {
118 break;
120 /* Syscall writes 0 to V0 to bypass error check, similar
121 to how this is handled internal to Linux kernel.
122 (Ab)use trapnr temporarily as boolean indicating error. */
123 trapnr = (env->ir[IR_V0] != 0 && sysret < 0);
124 env->ir[IR_V0] = (trapnr ? -sysret : sysret);
125 env->ir[IR_A3] = trapnr;
126 break;
127 case 0x86:
128 /* IMB */
129 /* ??? We can probably elide the code using page_unprotect
130 that is checking for self-modifying code. Instead we
131 could simply call tb_flush here. Until we work out the
132 changes required to turn off the extra write protection,
133 this can be a no-op. */
134 break;
135 case 0x9E:
136 /* RDUNIQUE */
137 /* Handled in the translator for usermode. */
138 abort();
139 case 0x9F:
140 /* WRUNIQUE */
141 /* Handled in the translator for usermode. */
142 abort();
143 case 0xAA:
144 /* GENTRAP */
145 info.si_signo = TARGET_SIGFPE;
146 switch (env->ir[IR_A0]) {
147 case TARGET_GEN_INTOVF:
148 info.si_code = TARGET_FPE_INTOVF;
149 break;
150 case TARGET_GEN_INTDIV:
151 info.si_code = TARGET_FPE_INTDIV;
152 break;
153 case TARGET_GEN_FLTOVF:
154 info.si_code = TARGET_FPE_FLTOVF;
155 break;
156 case TARGET_GEN_FLTUND:
157 info.si_code = TARGET_FPE_FLTUND;
158 break;
159 case TARGET_GEN_FLTINV:
160 info.si_code = TARGET_FPE_FLTINV;
161 break;
162 case TARGET_GEN_FLTINE:
163 info.si_code = TARGET_FPE_FLTRES;
164 break;
165 case TARGET_GEN_ROPRAND:
166 info.si_code = 0;
167 break;
168 default:
169 info.si_signo = TARGET_SIGTRAP;
170 info.si_code = 0;
171 break;
173 info.si_errno = 0;
174 info._sifields._sigfault._addr = env->pc;
175 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
176 break;
177 default:
178 goto do_sigill;
180 break;
181 case EXCP_DEBUG:
182 info.si_signo = gdb_handlesig(cs, TARGET_SIGTRAP);
183 if (info.si_signo) {
184 info.si_errno = 0;
185 info.si_code = TARGET_TRAP_BRKPT;
186 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
187 } else {
188 arch_interrupt = false;
190 break;
191 case EXCP_INTERRUPT:
192 /* Just indicate that signals should be handled asap. */
193 break;
194 case EXCP_ATOMIC:
195 cpu_exec_step_atomic(cs);
196 arch_interrupt = false;
197 break;
198 default:
199 printf ("Unhandled trap: 0x%x\n", trapnr);
200 cpu_dump_state(cs, stderr, fprintf, 0);
201 exit(EXIT_FAILURE);
203 process_pending_signals (env);
205 /* Most of the traps imply a transition through PALcode, which
206 implies an REI instruction has been executed. Which means
207 that RX and LOCK_ADDR should be cleared. But there are a
208 few exceptions for traps internal to QEMU. */
209 if (arch_interrupt) {
210 env->flags &= ~ENV_FLAG_RX_FLAG;
211 env->lock_addr = -1;
216 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
218 int i;
220 for(i = 0; i < 28; i++) {
221 env->ir[i] = ((abi_ulong *)regs)[i];
223 env->ir[IR_SP] = regs->usp;
224 env->pc = regs->pc;