chardev: ensure qemu_chr_parse_compat reports missing driver error
[qemu/ar7.git] / linux-user / nios2 / cpu_loop.c
blobb96b1aa1195aa86a867991c937b2b5cce2fd46ea
1 /*
2 * qemu user cpu loop
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
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.
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/>.
20 #include "qemu/osdep.h"
21 #include "qemu.h"
22 #include "cpu_loop-common.h"
24 void cpu_loop(CPUNios2State *env)
26 CPUState *cs = ENV_GET_CPU(env);
27 Nios2CPU *cpu = NIOS2_CPU(cs);
28 target_siginfo_t info;
29 int trapnr, ret;
31 for (;;) {
32 cpu_exec_start(cs);
33 trapnr = cpu_exec(cs);
34 cpu_exec_end(cs);
36 switch (trapnr) {
37 case EXCP_INTERRUPT:
38 /* just indicate that signals should be handled asap */
39 break;
40 case EXCP_TRAP:
41 if (env->regs[R_AT] == 0) {
42 abi_long ret;
43 qemu_log_mask(CPU_LOG_INT, "\nSyscall\n");
45 ret = do_syscall(env, env->regs[2],
46 env->regs[4], env->regs[5], env->regs[6],
47 env->regs[7], env->regs[8], env->regs[9],
48 0, 0);
50 if (env->regs[2] == 0) { /* FIXME: syscall 0 workaround */
51 ret = 0;
54 env->regs[2] = abs(ret);
55 /* Return value is 0..4096 */
56 env->regs[7] = (ret > 0xfffffffffffff000ULL);
57 env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
58 env->regs[CR_STATUS] &= ~0x3;
59 env->regs[R_EA] = env->regs[R_PC] + 4;
60 env->regs[R_PC] += 4;
61 break;
62 } else {
63 qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
65 env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
66 env->regs[CR_STATUS] &= ~0x3;
67 env->regs[R_EA] = env->regs[R_PC] + 4;
68 env->regs[R_PC] = cpu->exception_addr;
70 info.si_signo = TARGET_SIGTRAP;
71 info.si_errno = 0;
72 info.si_code = TARGET_TRAP_BRKPT;
73 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
74 break;
76 case 0xaa:
77 switch (env->regs[R_PC]) {
78 /*case 0x1000:*/ /* TODO:__kuser_helper_version */
79 case 0x1004: /* __kuser_cmpxchg */
80 start_exclusive();
81 if (env->regs[4] & 0x3) {
82 goto kuser_fail;
84 ret = get_user_u32(env->regs[2], env->regs[4]);
85 if (ret) {
86 end_exclusive();
87 goto kuser_fail;
89 env->regs[2] -= env->regs[5];
90 if (env->regs[2] == 0) {
91 put_user_u32(env->regs[6], env->regs[4]);
93 end_exclusive();
94 env->regs[R_PC] = env->regs[R_RA];
95 break;
96 /*case 0x1040:*/ /* TODO:__kuser_sigtramp */
97 default:
99 kuser_fail:
100 info.si_signo = TARGET_SIGSEGV;
101 info.si_errno = 0;
102 /* TODO: check env->error_code */
103 info.si_code = TARGET_SEGV_MAPERR;
104 info._sifields._sigfault._addr = env->regs[R_PC];
105 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
107 break;
108 default:
109 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
110 trapnr);
111 abort();
114 process_pending_signals(env);
118 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
120 env->regs[0] = 0;
121 env->regs[1] = regs->r1;
122 env->regs[2] = regs->r2;
123 env->regs[3] = regs->r3;
124 env->regs[4] = regs->r4;
125 env->regs[5] = regs->r5;
126 env->regs[6] = regs->r6;
127 env->regs[7] = regs->r7;
128 env->regs[8] = regs->r8;
129 env->regs[9] = regs->r9;
130 env->regs[10] = regs->r10;
131 env->regs[11] = regs->r11;
132 env->regs[12] = regs->r12;
133 env->regs[13] = regs->r13;
134 env->regs[14] = regs->r14;
135 env->regs[15] = regs->r15;
136 /* TODO: unsigned long orig_r2; */
137 env->regs[R_RA] = regs->ra;
138 env->regs[R_FP] = regs->fp;
139 env->regs[R_SP] = regs->sp;
140 env->regs[R_GP] = regs->gp;
141 env->regs[CR_ESTATUS] = regs->estatus;
142 env->regs[R_EA] = regs->ea;
143 /* TODO: unsigned long orig_r7; */
145 /* Emulate eret when starting thread. */
146 env->regs[R_PC] = regs->ea;