| 1 | /* |
| 2 | * qemu user cpu loop |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include "qemu.h" |
| 23 | #include "user-internals.h" |
| 24 | #include "user/cpu_loop.h" |
| 25 | #include "target/hexagon/internal.h" |
| 26 | #include "signal-common.h" |
| 27 | #include "internal.h" |
| 28 | |
| 29 | void cpu_loop(CPUHexagonState *env) |
| 30 | { |
| 31 | CPUState *cs = env_cpu(env); |
| 32 | int trapnr; |
| 33 | target_ulong syscallnum; |
| 34 | target_ulong ret; |
| 35 | |
| 36 | for (;;) { |
| 37 | cpu_exec_start(cs); |
| 38 | trapnr = cpu_exec(cs); |
| 39 | cpu_exec_end(cs); |
| 40 | qemu_process_cpu_events(cs); |
| 41 | |
| 42 | switch (trapnr) { |
| 43 | case EXCP_INTERRUPT: |
| 44 | /* just indicate that signals should be handled asap */ |
| 45 | break; |
| 46 | case HEX_EVENT_TRAP0: |
| 47 | syscallnum = env->gpr[6]; |
| 48 | env->gpr[HEX_REG_PC] += 4; |
| 49 | ret = do_syscall(env, |
| 50 | syscallnum, |
| 51 | env->gpr[0], |
| 52 | env->gpr[1], |
| 53 | env->gpr[2], |
| 54 | env->gpr[3], |
| 55 | env->gpr[4], |
| 56 | env->gpr[5], |
| 57 | 0, 0); |
| 58 | if (ret == -QEMU_ERESTARTSYS) { |
| 59 | env->gpr[HEX_REG_PC] -= 4; |
| 60 | } else if (ret != -QEMU_ESIGRETURN && ret != -QEMU_ESETPC) { |
| 61 | env->gpr[0] = ret; |
| 62 | } |
| 63 | break; |
| 64 | case HEX_EVENT_PRECISE: |
| 65 | switch (env->cause_code) { |
| 66 | case HEX_CAUSE_FETCH_NO_UPAGE: |
| 67 | case HEX_CAUSE_PRIV_NO_UREAD: |
| 68 | case HEX_CAUSE_PRIV_NO_UWRITE: |
| 69 | force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, |
| 70 | env->gpr[HEX_REG_PC]); |
| 71 | |
| 72 | break; |
| 73 | case HEX_CAUSE_PRIV_USER_NO_GINSN: |
| 74 | case HEX_CAUSE_PRIV_USER_NO_SINSN: |
| 75 | case HEX_CAUSE_INVALID_PACKET: |
| 76 | force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, |
| 77 | env->gpr[HEX_REG_PC]); |
| 78 | break; |
| 79 | case HEX_CAUSE_MISALIGNED_LOAD: |
| 80 | case HEX_CAUSE_MISALIGNED_STORE: |
| 81 | force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, |
| 82 | env->gpr[HEX_REG_PC]); |
| 83 | break; |
| 84 | default: |
| 85 | EXCP_DUMP(env, "\nqemu: unhandled CPU precise exception " |
| 86 | "cause code 0x%x - aborting\n", |
| 87 | env->cause_code); |
| 88 | exit(EXIT_FAILURE); |
| 89 | } |
| 90 | break; |
| 91 | case HEX_CAUSE_PC_NOT_ALIGNED: |
| 92 | force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, |
| 93 | env->gpr[HEX_REG_R31]); |
| 94 | break; |
| 95 | case HEX_CAUSE_INVALID_PACKET: |
| 96 | case HEX_CAUSE_REG_WRITE_CONFLICT: |
| 97 | force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, |
| 98 | env->gpr[HEX_REG_PC]); |
| 99 | break; |
| 100 | case EXCP_ATOMIC: |
| 101 | cpu_exec_step_atomic(cs); |
| 102 | break; |
| 103 | case EXCP_DEBUG: |
| 104 | force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0); |
| 105 | break; |
| 106 | default: |
| 107 | EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n", |
| 108 | trapnr); |
| 109 | exit(EXIT_FAILURE); |
| 110 | } |
| 111 | process_pending_signals(env); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | void init_main_thread(CPUState *cs, struct image_info *info) |
| 116 | { |
| 117 | CPUArchState *env = cpu_env(cs); |
| 118 | |
| 119 | env->gpr[HEX_REG_PC] = info->entry; |
| 120 | env->gpr[HEX_REG_SP] = info->start_stack; |
| 121 | env->gpr[HEX_REG_USR] = 0x56000; |
| 122 | } |