| 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 "user/cpu_loop.h" |
| 24 | #include "signal-common.h" |
| 25 | |
| 26 | void cpu_loop(CPUSH4State *env) |
| 27 | { |
| 28 | CPUState *cs = env_cpu(env); |
| 29 | int trapnr, ret; |
| 30 | |
| 31 | while (1) { |
| 32 | bool arch_interrupt = true; |
| 33 | |
| 34 | cpu_exec_start(cs); |
| 35 | trapnr = cpu_exec(cs); |
| 36 | cpu_exec_end(cs); |
| 37 | qemu_process_cpu_events(cs); |
| 38 | |
| 39 | switch (trapnr) { |
| 40 | case 0x160: |
| 41 | env->pc += 2; |
| 42 | ret = do_syscall(env, |
| 43 | env->gregs[3], |
| 44 | env->gregs[4], |
| 45 | env->gregs[5], |
| 46 | env->gregs[6], |
| 47 | env->gregs[7], |
| 48 | env->gregs[0], |
| 49 | env->gregs[1], |
| 50 | 0, 0); |
| 51 | if (ret == -QEMU_ERESTARTSYS) { |
| 52 | env->pc -= 2; |
| 53 | } else if (ret != -QEMU_ESIGRETURN && ret != -QEMU_ESETPC) { |
| 54 | env->gregs[0] = ret; |
| 55 | } |
| 56 | break; |
| 57 | case EXCP_INTERRUPT: |
| 58 | /* just indicate that signals should be handled asap */ |
| 59 | break; |
| 60 | case EXCP_DEBUG: |
| 61 | force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); |
| 62 | break; |
| 63 | case EXCP_ATOMIC: |
| 64 | cpu_exec_step_atomic(cs); |
| 65 | arch_interrupt = false; |
| 66 | break; |
| 67 | case 0x180: |
| 68 | /* Illegal instruction */ |
| 69 | /* fallthrough */ |
| 70 | case 0x1a0: |
| 71 | /* Illegal instruction in delay slot */ |
| 72 | force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc); |
| 73 | break; |
| 74 | default: |
| 75 | fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); |
| 76 | cpu_dump_state(cs, stderr, 0); |
| 77 | exit(EXIT_FAILURE); |
| 78 | } |
| 79 | process_pending_signals (env); |
| 80 | |
| 81 | /* Most of the traps imply an exception or interrupt, which |
| 82 | implies an REI instruction has been executed. Which means |
| 83 | that LDST (aka LOK_ADDR) should be cleared. But there are |
| 84 | a few exceptions for traps internal to QEMU. */ |
| 85 | if (arch_interrupt) { |
| 86 | env->lock_addr = -1; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | void init_main_thread(CPUState *cs, struct image_info *info) |
| 92 | { |
| 93 | CPUArchState *env = cpu_env(cs); |
| 94 | |
| 95 | env->pc = info->entry; |
| 96 | env->gregs[15] = info->start_stack; |
| 97 | } |