Merge tag 'linux-user-for-7.1-pull-request' of https://gitlab.com/laurent_vivier...
[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 EXCP_INTERRUPT:
41 /* just indicate that signals should be handled asap */
42 break;
43 case EXCP_SYSCALL:
44 /* Return address is 4 bytes after the call. */
45 env->regs[14] += 4;
46 env->pc = env->regs[14];
47 ret = do_syscall(env,
48 env->regs[12],
49 env->regs[5],
50 env->regs[6],
51 env->regs[7],
52 env->regs[8],
53 env->regs[9],
54 env->regs[10],
55 0, 0);
56 if (ret == -TARGET_ERESTARTSYS) {
57 /* Wind back to before the syscall. */
58 env->pc -= 4;
59 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
60 env->regs[3] = ret;
61 }
62 /* All syscall exits result in guest r14 being equal to the
63 * PC we return to, because the kernel syscall exit "rtbd" does
64 * this. (This is true even for sigreturn(); note that r14 is
65 * not a userspace-usable register, as the kernel may clobber it
66 * at any point.)
67 */
68 env->regs[14] = env->pc;
69 break;
70 case EXCP_HW_EXCP:
71 env->regs[17] = env->pc + 4;
72 if (env->iflags & D_FLAG) {
73 env->esr |= 1 << 12;
74 env->pc -= 4;
75 /* FIXME: if branch was immed, replay the imm as well. */
76 }
77
78 env->iflags &= ~(IMM_FLAG | D_FLAG);
79
80 switch (env->esr & 31) {
81 case ESR_EC_DIVZERO:
82 info.si_signo = TARGET_SIGFPE;
83 info.si_errno = 0;
84 info.si_code = TARGET_FPE_FLTDIV;
85 info._sifields._sigfault._addr = 0;
86 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
87 break;
88 case ESR_EC_FPU:
89 info.si_signo = TARGET_SIGFPE;
90 info.si_errno = 0;
91 if (env->fsr & FSR_IO) {
92 info.si_code = TARGET_FPE_FLTINV;
93 }
94 if (env->fsr & FSR_DZ) {
95 info.si_code = TARGET_FPE_FLTDIV;
96 }
97 info._sifields._sigfault._addr = 0;
98 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
99 break;
100 default:
101 fprintf(stderr, "Unhandled hw-exception: 0x%x\n",
102 env->esr & ESR_EC_MASK);
103 cpu_dump_state(cs, stderr, 0);
104 exit(EXIT_FAILURE);
105 break;
106 }
107 break;
108 case EXCP_DEBUG:
109 info.si_signo = TARGET_SIGTRAP;
110 info.si_errno = 0;
111 info.si_code = TARGET_TRAP_BRKPT;
112 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
113 break;
114 case EXCP_ATOMIC:
115 cpu_exec_step_atomic(cs);
116 break;
117 default:
118 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
119 cpu_dump_state(cs, stderr, 0);
120 exit(EXIT_FAILURE);
121 }
122 process_pending_signals (env);
123 }
124 }
125
126 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
127 {
128 env->regs[0] = regs->r0;
129 env->regs[1] = regs->r1;
130 env->regs[2] = regs->r2;
131 env->regs[3] = regs->r3;
132 env->regs[4] = regs->r4;
133 env->regs[5] = regs->r5;
134 env->regs[6] = regs->r6;
135 env->regs[7] = regs->r7;
136 env->regs[8] = regs->r8;
137 env->regs[9] = regs->r9;
138 env->regs[10] = regs->r10;
139 env->regs[11] = regs->r11;
140 env->regs[12] = regs->r12;
141 env->regs[13] = regs->r13;
142 env->regs[14] = regs->r14;
143 env->regs[15] = regs->r15;
144 env->regs[16] = regs->r16;
145 env->regs[17] = regs->r17;
146 env->regs[18] = regs->r18;
147 env->regs[19] = regs->r19;
148 env->regs[20] = regs->r20;
149 env->regs[21] = regs->r21;
150 env->regs[22] = regs->r22;
151 env->regs[23] = regs->r23;
152 env->regs[24] = regs->r24;
153 env->regs[25] = regs->r25;
154 env->regs[26] = regs->r26;
155 env->regs[27] = regs->r27;
156 env->regs[28] = regs->r28;
157 env->regs[29] = regs->r29;
158 env->regs[30] = regs->r30;
159 env->regs[31] = regs->r31;
160 env->pc = regs->pc;
161 }