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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 | 22 | #include "qemu.h" |
3b249d26 | 23 | #include "user-internals.h" |
cd71c089 | 24 | #include "cpu_loop-common.h" |
2113aed6 | 25 | #include "signal-common.h" |
cd71c089 | 26 | |
a5fd8ee1 LV |
27 | /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */ |
28 | #define S390X_FAIL_ADDR_MASK -4096LL | |
29 | ||
ccb5f270 JA |
30 | static int get_pgm_data_si_code(int dxc_code) |
31 | { | |
32 | switch (dxc_code) { | |
33 | /* Non-simulated IEEE exceptions */ | |
34 | case 0x80: | |
35 | return TARGET_FPE_FLTINV; | |
36 | case 0x40: | |
37 | return TARGET_FPE_FLTDIV; | |
38 | case 0x20: | |
39 | case 0x28: | |
40 | case 0x2c: | |
41 | return TARGET_FPE_FLTOVF; | |
42 | case 0x10: | |
43 | case 0x18: | |
44 | case 0x1c: | |
45 | return TARGET_FPE_FLTUND; | |
46 | case 0x08: | |
47 | case 0x0c: | |
48 | return TARGET_FPE_FLTRES; | |
49 | } | |
50 | /* | |
51 | * Non-IEEE and simulated IEEE: | |
52 | * Includes compare-and-trap, quantum exception, etc. | |
53 | * Simulated IEEE are included here to match current | |
54 | * s390x linux kernel. | |
55 | */ | |
56 | return 0; | |
57 | } | |
58 | ||
a5fd8ee1 LV |
59 | void cpu_loop(CPUS390XState *env) |
60 | { | |
dc79e928 | 61 | CPUState *cs = env_cpu(env); |
a5fd8ee1 LV |
62 | int trapnr, n, sig; |
63 | target_siginfo_t info; | |
64 | target_ulong addr; | |
65 | abi_long ret; | |
66 | ||
67 | while (1) { | |
68 | cpu_exec_start(cs); | |
69 | trapnr = cpu_exec(cs); | |
70 | cpu_exec_end(cs); | |
71 | process_queued_cpu_work(cs); | |
72 | ||
73 | switch (trapnr) { | |
74 | case EXCP_INTERRUPT: | |
75 | /* Just indicate that signals should be handled asap. */ | |
76 | break; | |
77 | ||
78 | case EXCP_SVC: | |
79 | n = env->int_svc_code; | |
80 | if (!n) { | |
81 | /* syscalls > 255 */ | |
82 | n = env->regs[1]; | |
83 | } | |
84 | env->psw.addr += env->int_svc_ilen; | |
85 | ret = do_syscall(env, n, env->regs[2], env->regs[3], | |
86 | env->regs[4], env->regs[5], | |
87 | env->regs[6], env->regs[7], 0, 0); | |
88 | if (ret == -TARGET_ERESTARTSYS) { | |
89 | env->psw.addr -= env->int_svc_ilen; | |
90 | } else if (ret != -TARGET_QEMU_ESIGRETURN) { | |
91 | env->regs[2] = ret; | |
92 | } | |
93 | break; | |
94 | ||
95 | case EXCP_DEBUG: | |
b10089a1 PM |
96 | sig = TARGET_SIGTRAP; |
97 | n = TARGET_TRAP_BRKPT; | |
54ba2161 IL |
98 | /* |
99 | * For SIGTRAP the PSW must point after the instruction, which it | |
100 | * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need | |
101 | * to be filled. | |
102 | */ | |
103 | addr = 0; | |
104 | goto do_signal; | |
a5fd8ee1 LV |
105 | case EXCP_PGM: |
106 | n = env->int_pgm_code; | |
107 | switch (n) { | |
108 | case PGM_OPERATION: | |
109 | case PGM_PRIVILEGED: | |
110 | sig = TARGET_SIGILL; | |
111 | n = TARGET_ILL_ILLOPC; | |
112 | goto do_signal_pc; | |
113 | case PGM_PROTECTION: | |
114 | case PGM_ADDRESSING: | |
115 | sig = TARGET_SIGSEGV; | |
116 | /* XXX: check env->error_code */ | |
117 | n = TARGET_SEGV_MAPERR; | |
118 | addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; | |
119 | goto do_signal; | |
120 | case PGM_EXECUTE: | |
121 | case PGM_SPECIFICATION: | |
122 | case PGM_SPECIAL_OP: | |
123 | case PGM_OPERAND: | |
124 | do_sigill_opn: | |
125 | sig = TARGET_SIGILL; | |
126 | n = TARGET_ILL_ILLOPN; | |
127 | goto do_signal_pc; | |
128 | ||
129 | case PGM_FIXPT_OVERFLOW: | |
130 | sig = TARGET_SIGFPE; | |
131 | n = TARGET_FPE_INTOVF; | |
132 | goto do_signal_pc; | |
133 | case PGM_FIXPT_DIVIDE: | |
134 | sig = TARGET_SIGFPE; | |
135 | n = TARGET_FPE_INTDIV; | |
136 | goto do_signal_pc; | |
137 | ||
138 | case PGM_DATA: | |
139 | n = (env->fpc >> 8) & 0xff; | |
ccb5f270 | 140 | if (n == 0) { |
a5fd8ee1 | 141 | goto do_sigill_opn; |
a5fd8ee1 LV |
142 | } |
143 | ||
ccb5f270 JA |
144 | sig = TARGET_SIGFPE; |
145 | n = get_pgm_data_si_code(n); | |
146 | goto do_signal_pc; | |
147 | ||
a5fd8ee1 LV |
148 | default: |
149 | fprintf(stderr, "Unhandled program exception: %#x\n", n); | |
90c84c56 | 150 | cpu_dump_state(cs, stderr, 0); |
a5fd8ee1 LV |
151 | exit(EXIT_FAILURE); |
152 | } | |
153 | break; | |
154 | ||
155 | do_signal_pc: | |
156 | addr = env->psw.addr; | |
54ba2161 IL |
157 | /* |
158 | * For SIGILL and SIGFPE the PSW must point after the instruction. | |
159 | */ | |
160 | env->psw.addr += env->int_pgm_ilen; | |
a5fd8ee1 LV |
161 | do_signal: |
162 | info.si_signo = sig; | |
163 | info.si_errno = 0; | |
164 | info.si_code = n; | |
165 | info._sifields._sigfault._addr = addr; | |
166 | queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); | |
167 | break; | |
168 | ||
169 | case EXCP_ATOMIC: | |
170 | cpu_exec_step_atomic(cs); | |
171 | break; | |
172 | default: | |
173 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); | |
90c84c56 | 174 | cpu_dump_state(cs, stderr, 0); |
a5fd8ee1 LV |
175 | exit(EXIT_FAILURE); |
176 | } | |
177 | process_pending_signals (env); | |
178 | } | |
179 | } | |
180 | ||
cd71c089 LV |
181 | void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) |
182 | { | |
a5fd8ee1 LV |
183 | int i; |
184 | for (i = 0; i < 16; i++) { | |
185 | env->regs[i] = regs->gprs[i]; | |
186 | } | |
187 | env->psw.mask = regs->psw.mask; | |
188 | env->psw.addr = regs->psw.addr; | |
cd71c089 | 189 | } |