| 1 | /* |
| 2 | * emulator main execution loop |
| 3 | * |
| 4 | * Copyright (c) 2003-2005 Fabrice Bellard |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library 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 GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "exec/log.h" |
| 22 | #include "system/tcg.h" |
| 23 | #include "qemu/plugin.h" |
| 24 | #include "accel/tcg/cpu-loop.h" |
| 25 | #include "internal-common.h" |
| 26 | |
| 27 | bool tcg_allowed; |
| 28 | |
| 29 | bool tcg_cflags_has(CPUState *cpu, uint32_t flags) |
| 30 | { |
| 31 | return cpu->tcg_cflags & flags; |
| 32 | } |
| 33 | |
| 34 | void tcg_cflags_set(CPUState *cpu, uint32_t flags) |
| 35 | { |
| 36 | cpu->tcg_cflags |= flags; |
| 37 | } |
| 38 | |
| 39 | uint32_t curr_cflags(CPUState *cpu) |
| 40 | { |
| 41 | uint32_t cflags = cpu->tcg_cflags; |
| 42 | |
| 43 | /* |
| 44 | * Record gdb single-step. We should be exiting the TB by raising |
| 45 | * EXCP_DEBUG, but to simplify other tests, disable chaining too. |
| 46 | * |
| 47 | * For singlestep and -d nochain, suppress goto_tb so that |
| 48 | * we can log -d cpu,exec after every TB. |
| 49 | */ |
| 50 | if (unlikely(cpu_single_stepping(cpu))) { |
| 51 | cflags |= CF_NO_GOTO_TB | CF_NO_GOTO_PTR | CF_SINGLE_STEP | 1; |
| 52 | } else if (qatomic_read(&one_insn_per_tb)) { |
| 53 | cflags |= CF_NO_GOTO_TB | 1; |
| 54 | } else if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) { |
| 55 | cflags |= CF_NO_GOTO_TB; |
| 56 | } |
| 57 | |
| 58 | return cflags; |
| 59 | } |
| 60 | |
| 61 | /* exit the current TB, but without causing any exception to be raised */ |
| 62 | void cpu_loop_exit_noexc(CPUState *cpu) |
| 63 | { |
| 64 | cpu->exception_index = -1; |
| 65 | cpu_loop_exit(cpu); |
| 66 | } |
| 67 | |
| 68 | void cpu_loop_exit(CPUState *cpu) |
| 69 | { |
| 70 | /* Undo the setting in cpu_tb_exec. */ |
| 71 | cpu->neg.can_do_io = true; |
| 72 | /* Undo any setting in generated code. */ |
| 73 | qemu_plugin_disable_mem_helpers(cpu); |
| 74 | siglongjmp(cpu->jmp_env, 1); |
| 75 | } |
| 76 | |
| 77 | void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc) |
| 78 | { |
| 79 | if (pc) { |
| 80 | cpu_restore_state(cpu, pc); |
| 81 | } |
| 82 | cpu_loop_exit(cpu); |
| 83 | } |
| 84 | |
| 85 | void cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc) |
| 86 | { |
| 87 | /* Prevent looping if already executing in a serial context. */ |
| 88 | g_assert(!cpu_in_serial_context(cpu)); |
| 89 | cpu->exception_index = EXCP_ATOMIC; |
| 90 | cpu_loop_exit_restore(cpu, pc); |
| 91 | } |