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 "user-internals.h"
23 #include "cpu_loop-common.h"
24 #include "signal-common.h"
25
hppa_lws(CPUHPPAState * env)26 static abi_ulong hppa_lws(CPUHPPAState *env)
27 {
28 CPUState *cs = env_cpu(env);
29 uint32_t which = env->gr[20];
30 abi_ulong addr = env->gr[26];
31 abi_ulong old = env->gr[25];
32 abi_ulong new = env->gr[24];
33 abi_ulong size, ret;
34
35 switch (which) {
36 default:
37 return -TARGET_ENOSYS;
38
39 case 0: /* elf32 atomic 32bit cmpxchg */
40 if ((addr & 3) || !access_ok(cs, VERIFY_WRITE, addr, 4)) {
41 return -TARGET_EFAULT;
42 }
43 old = tswap32(old);
44 new = tswap32(new);
45 ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
46 ret = tswap32(ret);
47 break;
48
49 case 2: /* elf32 atomic "new" cmpxchg */
50 size = env->gr[23];
51 if (size >= 4) {
52 return -TARGET_ENOSYS;
53 }
54 if (((addr | old | new) & ((1 << size) - 1))
55 || !access_ok(cs, VERIFY_WRITE, addr, 1 << size)
56 || !access_ok(cs, VERIFY_READ, old, 1 << size)
57 || !access_ok(cs, VERIFY_READ, new, 1 << size)) {
58 return -TARGET_EFAULT;
59 }
60 /* Note that below we use host-endian loads so that the cmpxchg
61 can be host-endian as well. */
62 switch (size) {
63 case 0:
64 old = *(uint8_t *)g2h(cs, old);
65 new = *(uint8_t *)g2h(cs, new);
66 ret = qatomic_cmpxchg((uint8_t *)g2h(cs, addr), old, new);
67 ret = ret != old;
68 break;
69 case 1:
70 old = *(uint16_t *)g2h(cs, old);
71 new = *(uint16_t *)g2h(cs, new);
72 ret = qatomic_cmpxchg((uint16_t *)g2h(cs, addr), old, new);
73 ret = ret != old;
74 break;
75 case 2:
76 old = *(uint32_t *)g2h(cs, old);
77 new = *(uint32_t *)g2h(cs, new);
78 ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
79 ret = ret != old;
80 break;
81 case 3:
82 {
83 uint64_t o64, n64, r64;
84 o64 = *(uint64_t *)g2h(cs, old);
85 n64 = *(uint64_t *)g2h(cs, new);
86 #ifdef CONFIG_ATOMIC64
87 r64 = qatomic_cmpxchg__nocheck((aligned_uint64_t *)g2h(cs, addr),
88 o64, n64);
89 ret = r64 != o64;
90 #else
91 start_exclusive();
92 r64 = *(uint64_t *)g2h(cs, addr);
93 ret = 1;
94 if (r64 == o64) {
95 *(uint64_t *)g2h(cs, addr) = n64;
96 ret = 0;
97 }
98 end_exclusive();
99 #endif
100 }
101 break;
102 }
103 break;
104 }
105
106 env->gr[28] = ret;
107 return 0;
108 }
109
cpu_loop(CPUHPPAState * env)110 void cpu_loop(CPUHPPAState *env)
111 {
112 CPUState *cs = env_cpu(env);
113 abi_ulong ret;
114 int trapnr;
115
116 while (1) {
117 cpu_exec_start(cs);
118 trapnr = cpu_exec(cs);
119 cpu_exec_end(cs);
120 process_queued_cpu_work(cs);
121
122 switch (trapnr) {
123 case EXCP_SYSCALL:
124 ret = do_syscall(env, env->gr[20],
125 env->gr[26], env->gr[25],
126 env->gr[24], env->gr[23],
127 env->gr[22], env->gr[21], 0, 0);
128 switch (ret) {
129 default:
130 env->gr[28] = ret;
131 /* We arrived here by faking the gateway page. Return. */
132 env->iaoq_f = env->gr[31] | PRIV_USER;
133 env->iaoq_b = env->iaoq_f + 4;
134 break;
135 case -QEMU_ERESTARTSYS:
136 case -QEMU_ESIGRETURN:
137 break;
138 }
139 break;
140 case EXCP_SYSCALL_LWS:
141 env->gr[21] = hppa_lws(env);
142 /* We arrived here by faking the gateway page. Return. */
143 env->iaoq_f = env->gr[31] | PRIV_USER;
144 env->iaoq_b = env->iaoq_f + 4;
145 break;
146 case EXCP_IMP:
147 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, env->iaoq_f);
148 break;
149 case EXCP_ILL:
150 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
151 break;
152 case EXCP_PRIV_OPR:
153 /* check for glibc ABORT_INSTRUCTION "iitlbp %r0,(%sr0, %r0)" */
154 if (env->cr[CR_IIR] == 0x04000000) {
155 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->iaoq_f);
156 } else {
157 force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->iaoq_f);
158 }
159 break;
160 case EXCP_PRIV_REG:
161 force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVREG, env->iaoq_f);
162 break;
163 case EXCP_OVERFLOW:
164 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->iaoq_f);
165 break;
166 case EXCP_COND:
167 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_CONDTRAP, env->iaoq_f);
168 break;
169 case EXCP_ASSIST:
170 force_sig_fault(TARGET_SIGFPE, 0, env->iaoq_f);
171 break;
172 case EXCP_BREAK:
173 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
174 break;
175 case EXCP_DEBUG:
176 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->iaoq_f);
177 break;
178 case EXCP_INTERRUPT:
179 /* just indicate that signals should be handled asap */
180 break;
181 default:
182 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
183 abort();
184 }
185 process_pending_signals(env);
186 }
187 }
188
target_cpu_copy_regs(CPUArchState * env,struct target_pt_regs * regs)189 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
190 {
191 int i;
192 for (i = 1; i < 32; i++) {
193 env->gr[i] = regs->gr[i];
194 }
195 env->iaoq_f = regs->iaoq[0];
196 env->iaoq_b = regs->iaoq[1];
197 }
198