Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20211016' into staging
[qemu.git] / linux-user / microblaze / cpu_loop.c
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 void cpu_loop(CPUMBState *env)
28 {
29 CPUState *cs = env_cpu(env);
30 int trapnr, ret;
31 target_siginfo_t info;
32
33 while (1) {
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 0xaa:
41 {
42 info.si_signo = TARGET_SIGSEGV;
43 info.si_errno = 0;
44 /* XXX: check env->error_code */
45 info.si_code = TARGET_SEGV_MAPERR;
46 info._sifields._sigfault._addr = 0;
47 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
48 }
49 break;
50 case EXCP_INTERRUPT:
51 /* just indicate that signals should be handled asap */
52 break;
53 case EXCP_SYSCALL:
54 /* Return address is 4 bytes after the call. */
55 env->regs[14] += 4;
56 env->pc = env->regs[14];
57 ret = do_syscall(env,
58 env->regs[12],
59 env->regs[5],
60 env->regs[6],
61 env->regs[7],
62 env->regs[8],
63 env->regs[9],
64 env->regs[10],
65 0, 0);
66 if (ret == -TARGET_ERESTARTSYS) {
67 /* Wind back to before the syscall. */
68 env->pc -= 4;
69 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
70 env->regs[3] = ret;
71 }
72 /* All syscall exits result in guest r14 being equal to the
73 * PC we return to, because the kernel syscall exit "rtbd" does
74 * this. (This is true even for sigreturn(); note that r14 is
75 * not a userspace-usable register, as the kernel may clobber it
76 * at any point.)
77 */
78 env->regs[14] = env->pc;
79 break;
80 case EXCP_HW_EXCP:
81 env->regs[17] = env->pc + 4;
82 if (env->iflags & D_FLAG) {
83 env->esr |= 1 << 12;
84 env->pc -= 4;
85 /* FIXME: if branch was immed, replay the imm as well. */
86 }
87
88 env->iflags &= ~(IMM_FLAG | D_FLAG);
89
90 switch (env->esr & 31) {
91 case ESR_EC_DIVZERO:
92 info.si_signo = TARGET_SIGFPE;
93 info.si_errno = 0;
94 info.si_code = TARGET_FPE_FLTDIV;
95 info._sifields._sigfault._addr = 0;
96 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
97 break;
98 case ESR_EC_FPU:
99 info.si_signo = TARGET_SIGFPE;
100 info.si_errno = 0;
101 if (env->fsr & FSR_IO) {
102 info.si_code = TARGET_FPE_FLTINV;
103 }
104 if (env->fsr & FSR_DZ) {
105 info.si_code = TARGET_FPE_FLTDIV;
106 }
107 info._sifields._sigfault._addr = 0;
108 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
109 break;
110 default:
111 fprintf(stderr, "Unhandled hw-exception: 0x%x\n",
112 env->esr & ESR_EC_MASK);
113 cpu_dump_state(cs, stderr, 0);
114 exit(EXIT_FAILURE);
115 break;
116 }
117 break;
118 case EXCP_DEBUG:
119 info.si_signo = TARGET_SIGTRAP;
120 info.si_errno = 0;
121 info.si_code = TARGET_TRAP_BRKPT;
122 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
123 break;
124 case EXCP_ATOMIC:
125 cpu_exec_step_atomic(cs);
126 break;
127 default:
128 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
129 cpu_dump_state(cs, stderr, 0);
130 exit(EXIT_FAILURE);
131 }
132 process_pending_signals (env);
133 }
134 }
135
136 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
137 {
138 env->regs[0] = regs->r0;
139 env->regs[1] = regs->r1;
140 env->regs[2] = regs->r2;
141 env->regs[3] = regs->r3;
142 env->regs[4] = regs->r4;
143 env->regs[5] = regs->r5;
144 env->regs[6] = regs->r6;
145 env->regs[7] = regs->r7;
146 env->regs[8] = regs->r8;
147 env->regs[9] = regs->r9;
148 env->regs[10] = regs->r10;
149 env->regs[11] = regs->r11;
150 env->regs[12] = regs->r12;
151 env->regs[13] = regs->r13;
152 env->regs[14] = regs->r14;
153 env->regs[15] = regs->r15;
154 env->regs[16] = regs->r16;
155 env->regs[17] = regs->r17;
156 env->regs[18] = regs->r18;
157 env->regs[19] = regs->r19;
158 env->regs[20] = regs->r20;
159 env->regs[21] = regs->r21;
160 env->regs[22] = regs->r22;
161 env->regs[23] = regs->r23;
162 env->regs[24] = regs->r24;
163 env->regs[25] = regs->r25;
164 env->regs[26] = regs->r26;
165 env->regs[27] = regs->r27;
166 env->regs[28] = regs->r28;
167 env->regs[29] = regs->r29;
168 env->regs[30] = regs->r30;
169 env->regs[31] = regs->r31;
170 env->pc = regs->pc;
171 }