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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 | ||
27 | ||
28 | static int get_pgm_data_si_code(int dxc_code) | |
29 | { | |
30 | switch (dxc_code) { | |
31 | /* Non-simulated IEEE exceptions */ | |
32 | case 0x80: | |
33 | return TARGET_FPE_FLTINV; | |
34 | case 0x40: | |
35 | return TARGET_FPE_FLTDIV; | |
36 | case 0x20: | |
37 | case 0x28: | |
38 | case 0x2c: | |
39 | return TARGET_FPE_FLTOVF; | |
40 | case 0x10: | |
41 | case 0x18: | |
42 | case 0x1c: | |
43 | return TARGET_FPE_FLTUND; | |
44 | case 0x08: | |
45 | case 0x0c: | |
46 | return TARGET_FPE_FLTRES; | |
47 | } | |
48 | /* | |
49 | * Non-IEEE and simulated IEEE: | |
50 | * Includes compare-and-trap, quantum exception, etc. | |
51 | * Simulated IEEE are included here to match current | |
52 | * s390x linux kernel. | |
53 | */ | |
54 | return 0; | |
55 | } | |
56 | ||
57 | void cpu_loop(CPUS390XState *env) | |
58 | { | |
59 | CPUState *cs = env_cpu(env); | |
60 | int trapnr, n, sig; | |
61 | target_siginfo_t info; | |
62 | target_ulong addr; | |
63 | abi_long ret; | |
64 | ||
65 | while (1) { | |
66 | cpu_exec_start(cs); | |
67 | trapnr = cpu_exec(cs); | |
68 | cpu_exec_end(cs); | |
69 | process_queued_cpu_work(cs); | |
70 | ||
71 | switch (trapnr) { | |
72 | case EXCP_INTERRUPT: | |
73 | /* Just indicate that signals should be handled asap. */ | |
74 | break; | |
75 | ||
76 | case EXCP_SVC: | |
77 | n = env->int_svc_code; | |
78 | if (!n) { | |
79 | /* syscalls > 255 */ | |
80 | n = env->regs[1]; | |
81 | } | |
82 | env->psw.addr += env->int_svc_ilen; | |
83 | ret = do_syscall(env, n, env->regs[2], env->regs[3], | |
84 | env->regs[4], env->regs[5], | |
85 | env->regs[6], env->regs[7], 0, 0); | |
86 | if (ret == -QEMU_ERESTARTSYS) { | |
87 | env->psw.addr -= env->int_svc_ilen; | |
88 | } else if (ret != -QEMU_ESIGRETURN) { | |
89 | env->regs[2] = ret; | |
90 | } | |
91 | break; | |
92 | ||
93 | case EXCP_DEBUG: | |
94 | sig = TARGET_SIGTRAP; | |
95 | n = TARGET_TRAP_BRKPT; | |
96 | /* | |
97 | * For SIGTRAP the PSW must point after the instruction, which it | |
98 | * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need | |
99 | * to be filled. | |
100 | */ | |
101 | addr = 0; | |
102 | goto do_signal; | |
103 | case EXCP_PGM: | |
104 | n = env->int_pgm_code; | |
105 | switch (n) { | |
106 | case PGM_OPERATION: | |
107 | case PGM_PRIVILEGED: | |
108 | sig = TARGET_SIGILL; | |
109 | n = TARGET_ILL_ILLOPC; | |
110 | goto do_signal_pc; | |
111 | case PGM_PROTECTION: | |
112 | force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR, | |
113 | env->__excp_addr); | |
114 | break; | |
115 | case PGM_ADDRESSING: | |
116 | force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, | |
117 | env->__excp_addr); | |
118 | break; | |
119 | case PGM_EXECUTE: | |
120 | case PGM_SPECIFICATION: | |
121 | case PGM_SPECIAL_OP: | |
122 | case PGM_OPERAND: | |
123 | do_sigill_opn: | |
124 | sig = TARGET_SIGILL; | |
125 | n = TARGET_ILL_ILLOPN; | |
126 | goto do_signal_pc; | |
127 | ||
128 | case PGM_FIXPT_OVERFLOW: | |
129 | sig = TARGET_SIGFPE; | |
130 | n = TARGET_FPE_INTOVF; | |
131 | goto do_signal_pc; | |
132 | case PGM_FIXPT_DIVIDE: | |
133 | sig = TARGET_SIGFPE; | |
134 | n = TARGET_FPE_INTDIV; | |
135 | goto do_signal_pc; | |
136 | ||
137 | case PGM_DATA: | |
138 | n = (env->fpc >> 8) & 0xff; | |
139 | if (n == 0) { | |
140 | goto do_sigill_opn; | |
141 | } | |
142 | ||
143 | sig = TARGET_SIGFPE; | |
144 | n = get_pgm_data_si_code(n); | |
145 | goto do_signal_pc; | |
146 | ||
147 | default: | |
148 | fprintf(stderr, "Unhandled program exception: %#x\n", n); | |
149 | cpu_dump_state(cs, stderr, 0); | |
150 | exit(EXIT_FAILURE); | |
151 | } | |
152 | break; | |
153 | ||
154 | do_signal_pc: | |
155 | addr = env->psw.addr; | |
156 | /* | |
157 | * For SIGILL and SIGFPE the PSW must point after the instruction. | |
158 | */ | |
159 | env->psw.addr += env->int_pgm_ilen; | |
160 | do_signal: | |
161 | info.si_signo = sig; | |
162 | info.si_errno = 0; | |
163 | info.si_code = n; | |
164 | info._sifields._sigfault._addr = addr; | |
165 | queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); | |
166 | break; | |
167 | ||
168 | case EXCP_ATOMIC: | |
169 | cpu_exec_step_atomic(cs); | |
170 | break; | |
171 | default: | |
172 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); | |
173 | cpu_dump_state(cs, stderr, 0); | |
174 | exit(EXIT_FAILURE); | |
175 | } | |
176 | process_pending_signals (env); | |
177 | } | |
178 | } | |
179 | ||
180 | void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) | |
181 | { | |
182 | int i; | |
183 | for (i = 0; i < 16; i++) { | |
184 | env->regs[i] = regs->gprs[i]; | |
185 | } | |
186 | env->psw.mask = regs->psw.mask; | |
187 | env->psw.addr = regs->psw.addr; | |
188 | } |