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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" | |
21 | #include "qemu.h" | |
22 | #include "cpu_loop-common.h" | |
23 | ||
e256aefe LV |
24 | void cpu_loop(CPUAlphaState *env) |
25 | { | |
26 | CPUState *cs = CPU(alpha_env_get_cpu(env)); | |
27 | int trapnr; | |
28 | target_siginfo_t info; | |
29 | abi_long sysret; | |
30 | ||
31 | while (1) { | |
32 | bool arch_interrupt = true; | |
33 | ||
34 | cpu_exec_start(cs); | |
35 | trapnr = cpu_exec(cs); | |
36 | cpu_exec_end(cs); | |
37 | process_queued_cpu_work(cs); | |
38 | ||
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; | |
116 | } | |
117 | if (sysret == -TARGET_QEMU_ESIGRETURN) { | |
118 | break; | |
119 | } | |
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; | |
172 | } | |
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; | |
179 | } | |
180 | break; | |
181 | case EXCP_DEBUG: | |
b10089a1 PM |
182 | info.si_signo = TARGET_SIGTRAP; |
183 | info.si_errno = 0; | |
184 | info.si_code = TARGET_TRAP_BRKPT; | |
185 | queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); | |
e256aefe LV |
186 | break; |
187 | case EXCP_INTERRUPT: | |
188 | /* Just indicate that signals should be handled asap. */ | |
189 | break; | |
190 | case EXCP_ATOMIC: | |
191 | cpu_exec_step_atomic(cs); | |
192 | arch_interrupt = false; | |
193 | break; | |
194 | default: | |
84ca4fa9 | 195 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); |
e256aefe LV |
196 | cpu_dump_state(cs, stderr, fprintf, 0); |
197 | exit(EXIT_FAILURE); | |
198 | } | |
199 | process_pending_signals (env); | |
200 | ||
201 | /* Most of the traps imply a transition through PALcode, which | |
202 | implies an REI instruction has been executed. Which means | |
203 | that RX and LOCK_ADDR should be cleared. But there are a | |
204 | few exceptions for traps internal to QEMU. */ | |
205 | if (arch_interrupt) { | |
206 | env->flags &= ~ENV_FLAG_RX_FLAG; | |
207 | env->lock_addr = -1; | |
208 | } | |
209 | } | |
210 | } | |
211 | ||
cd71c089 LV |
212 | void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) |
213 | { | |
e256aefe LV |
214 | int i; |
215 | ||
216 | for(i = 0; i < 28; i++) { | |
217 | env->ir[i] = ((abi_ulong *)regs)[i]; | |
218 | } | |
219 | env->ir[IR_SP] = regs->usp; | |
220 | env->pc = regs->pc; | |
cd71c089 | 221 | } |