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cd71c089 LV |
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" | |
a8d25326 | 21 | #include "qemu-common.h" |
cd71c089 LV |
22 | #include "qemu.h" |
23 | #include "cpu_loop-common.h" | |
24 | ||
e256aefe LV |
25 | void cpu_loop(CPUAlphaState *env) |
26 | { | |
1c7ad260 | 27 | CPUState *cs = env_cpu(env); |
e256aefe LV |
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: | |
b10089a1 PM |
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); | |
e256aefe LV |
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: | |
84ca4fa9 | 196 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); |
90c84c56 | 197 | cpu_dump_state(cs, stderr, 0); |
e256aefe LV |
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 | ||
cd71c089 LV |
213 | void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) |
214 | { | |
e256aefe LV |
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; | |
cd71c089 | 222 | } |