From patchwork Thu May 18 19:14:54 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Zhong X-Patchwork-Id: 9733663 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DD113601A1 for ; Thu, 18 May 2017 11:19:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C6E2928720 for ; Thu, 18 May 2017 11:19:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BB1292879C; Thu, 18 May 2017 11:19:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00, DATE_IN_FUTURE_06_12, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7840828720 for ; Thu, 18 May 2017 11:19:54 +0000 (UTC) Received: from localhost ([::1]:53042 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dBJTF-00052Y-Jl for patchwork-qemu-devel@patchwork.kernel.org; Thu, 18 May 2017 07:19:53 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58202) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dBJRh-0004z2-3B for qemu-devel@nongnu.org; Thu, 18 May 2017 07:18:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dBJRc-0001l4-B2 for qemu-devel@nongnu.org; Thu, 18 May 2017 07:18:17 -0400 Received: from mga03.intel.com ([134.134.136.65]:4954) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dBJRa-0001OQ-Hb for qemu-devel@nongnu.org; Thu, 18 May 2017 07:18:12 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 May 2017 04:18:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.38,358,1491289200"; d="scan'208"; a="1171075948" Received: from yangzhon-virtual.bj.intel.com ([10.238.145.52]) by fmsmga002.fm.intel.com with ESMTP; 18 May 2017 04:18:08 -0700 From: Yang Zhong To: pbonzini@redhat.com Date: Fri, 19 May 2017 03:14:54 +0800 Message-Id: <1495134895-7814-3-git-send-email-yang.zhong@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1495134895-7814-1-git-send-email-yang.zhong@intel.com> References: <1495134895-7814-1-git-send-email-yang.zhong@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.65 Subject: [Qemu-devel] [PATCH 3/4] move cpu-exec.c X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yang Zhong , anthony.xu@intel.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP move cpu-exec.c to ./accel/tcg/ Signed-off-by: Yang Zhong --- Makefile.objs | 1 + Makefile.target | 4 +- accel/tcg/Makefile.objs | 1 + accel/tcg/cpu-exec.c | 686 ++++++++++++++++++++++++++++++++++++++++++++++++ accel/tcg/trace-events | 7 + cpu-exec.c | 685 ----------------------------------------------- trace-events | 5 - 7 files changed, 697 insertions(+), 692 deletions(-) create mode 100644 accel/tcg/cpu-exec.c create mode 100644 accel/tcg/trace-events delete mode 100644 cpu-exec.c diff --git a/Makefile.objs b/Makefile.objs index 2a8de77..6a33874 100644 --- a/Makefile.objs +++ b/Makefile.objs @@ -163,6 +163,7 @@ trace-events-subdirs += target/ppc trace-events-subdirs += qom trace-events-subdirs += linux-user trace-events-subdirs += qapi +trace-events-subdirs += accel/tcg trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PATH)/%/trace-events) diff --git a/Makefile.target b/Makefile.target index 3e19fe9..709d07a 100644 --- a/Makefile.target +++ b/Makefile.target @@ -88,7 +88,8 @@ all: $(PROGS) stap ######################################################### # cpu emulator library -obj-y = exec.o translate-all.o cpu-exec.o +obj-y = exec.o translate-all.o +obj-y += accel/ obj-y += translate-common.o obj-y += cpu-exec-common.o obj-y += tcg/tcg.o tcg/tcg-op.o tcg/optimize.o @@ -143,7 +144,6 @@ obj-y += arch_init.o cpus.o monitor.o gdbstub.o balloon.o ioport.o numa.o obj-y += qtest.o bootdevice.o obj-y += hw/ obj-$(CONFIG_KVM) += kvm-all.o -obj-y += accel/ obj-y += memory.o obj-y += memory_mapping.o obj-y += dump.o diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs index 487570f..6b75a31 100644 --- a/accel/tcg/Makefile.objs +++ b/accel/tcg/Makefile.objs @@ -1,2 +1,3 @@ obj-$(CONFIG_SOFTMMU) += tcg-all.o obj-$(CONFIG_SOFTMMU) += cputlb.o +obj-y += cpu-exec.o diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c new file mode 100644 index 0000000..2019160 --- /dev/null +++ b/accel/tcg/cpu-exec.c @@ -0,0 +1,686 @@ +/* + * emulator main execution loop + * + * Copyright (c) 2003-2005 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ +#include "qemu/osdep.h" +#include "cpu.h" +#include "trace.h" +#include "disas/disas.h" +#include "exec/exec-all.h" +#include "tcg.h" +#include "qemu/atomic.h" +#include "sysemu/qtest.h" +#include "qemu/timer.h" +#include "exec/address-spaces.h" +#include "qemu/rcu.h" +#include "exec/tb-hash.h" +#include "exec/log.h" +#include "qemu/main-loop.h" +#if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY) +#include "hw/i386/apic.h" +#endif +#include "sysemu/cpus.h" +#include "sysemu/replay.h" + +/* -icount align implementation. */ + +typedef struct SyncClocks { + int64_t diff_clk; + int64_t last_cpu_icount; + int64_t realtime_clock; +} SyncClocks; + +#if !defined(CONFIG_USER_ONLY) +/* Allow the guest to have a max 3ms advance. + * The difference between the 2 clocks could therefore + * oscillate around 0. + */ +#define VM_CLOCK_ADVANCE 3000000 +#define THRESHOLD_REDUCE 1.5 +#define MAX_DELAY_PRINT_RATE 2000000000LL +#define MAX_NB_PRINTS 100 + +static void align_clocks(SyncClocks *sc, const CPUState *cpu) +{ + int64_t cpu_icount; + + if (!icount_align_option) { + return; + } + + cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low; + sc->diff_clk += cpu_icount_to_ns(sc->last_cpu_icount - cpu_icount); + sc->last_cpu_icount = cpu_icount; + + if (sc->diff_clk > VM_CLOCK_ADVANCE) { +#ifndef _WIN32 + struct timespec sleep_delay, rem_delay; + sleep_delay.tv_sec = sc->diff_clk / 1000000000LL; + sleep_delay.tv_nsec = sc->diff_clk % 1000000000LL; + if (nanosleep(&sleep_delay, &rem_delay) < 0) { + sc->diff_clk = rem_delay.tv_sec * 1000000000LL + rem_delay.tv_nsec; + } else { + sc->diff_clk = 0; + } +#else + Sleep(sc->diff_clk / SCALE_MS); + sc->diff_clk = 0; +#endif + } +} + +static void print_delay(const SyncClocks *sc) +{ + static float threshold_delay; + static int64_t last_realtime_clock; + static int nb_prints; + + if (icount_align_option && + sc->realtime_clock - last_realtime_clock >= MAX_DELAY_PRINT_RATE && + nb_prints < MAX_NB_PRINTS) { + if ((-sc->diff_clk / (float)1000000000LL > threshold_delay) || + (-sc->diff_clk / (float)1000000000LL < + (threshold_delay - THRESHOLD_REDUCE))) { + threshold_delay = (-sc->diff_clk / 1000000000LL) + 1; + printf("Warning: The guest is now late by %.1f to %.1f seconds\n", + threshold_delay - 1, + threshold_delay); + nb_prints++; + last_realtime_clock = sc->realtime_clock; + } + } +} + +static void init_delay_params(SyncClocks *sc, + const CPUState *cpu) +{ + if (!icount_align_option) { + return; + } + sc->realtime_clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT); + sc->diff_clk = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - sc->realtime_clock; + sc->last_cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low; + if (sc->diff_clk < max_delay) { + max_delay = sc->diff_clk; + } + if (sc->diff_clk > max_advance) { + max_advance = sc->diff_clk; + } + + /* Print every 2s max if the guest is late. We limit the number + of printed messages to NB_PRINT_MAX(currently 100) */ + print_delay(sc); +} +#else +static void align_clocks(SyncClocks *sc, const CPUState *cpu) +{ +} + +static void init_delay_params(SyncClocks *sc, const CPUState *cpu) +{ +} +#endif /* CONFIG USER ONLY */ + +/* Execute a TB, and fix up the CPU state afterwards if necessary */ +static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb) +{ + CPUArchState *env = cpu->env_ptr; + uintptr_t ret; + TranslationBlock *last_tb; + int tb_exit; + uint8_t *tb_ptr = itb->tc_ptr; + + qemu_log_mask_and_addr(CPU_LOG_EXEC, itb->pc, + "Trace %p [%d: " TARGET_FMT_lx "] %s\n", + itb->tc_ptr, cpu->cpu_index, itb->pc, + lookup_symbol(itb->pc)); + +#if defined(DEBUG_DISAS) + if (qemu_loglevel_mask(CPU_LOG_TB_CPU) + && qemu_log_in_addr_range(itb->pc)) { + qemu_log_lock(); +#if defined(TARGET_I386) + log_cpu_state(cpu, CPU_DUMP_CCOP); +#else + log_cpu_state(cpu, 0); +#endif + qemu_log_unlock(); + } +#endif /* DEBUG_DISAS */ + + cpu->can_do_io = !use_icount; + ret = tcg_qemu_tb_exec(env, tb_ptr); + cpu->can_do_io = 1; + last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); + tb_exit = ret & TB_EXIT_MASK; + trace_exec_tb_exit(last_tb, tb_exit); + + if (tb_exit > TB_EXIT_IDX1) { + /* We didn't start executing this TB (eg because the instruction + * counter hit zero); we must restore the guest PC to the address + * of the start of the TB. + */ + CPUClass *cc = CPU_GET_CLASS(cpu); + qemu_log_mask_and_addr(CPU_LOG_EXEC, last_tb->pc, + "Stopped execution of TB chain before %p [" + TARGET_FMT_lx "] %s\n", + last_tb->tc_ptr, last_tb->pc, + lookup_symbol(last_tb->pc)); + if (cc->synchronize_from_tb) { + cc->synchronize_from_tb(cpu, last_tb); + } else { + assert(cc->set_pc); + cc->set_pc(cpu, last_tb->pc); + } + } + return ret; +} + +#ifndef CONFIG_USER_ONLY +/* Execute the code without caching the generated code. An interpreter + could be used if available. */ +static void cpu_exec_nocache(CPUState *cpu, int max_cycles, + TranslationBlock *orig_tb, bool ignore_icount) +{ + TranslationBlock *tb; + + /* Should never happen. + We only end up here when an existing TB is too long. */ + if (max_cycles > CF_COUNT_MASK) { + max_cycles = CF_COUNT_MASK; + } + + tb_lock(); + tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags, + max_cycles | CF_NOCACHE + | (ignore_icount ? CF_IGNORE_ICOUNT : 0)); + tb->orig_tb = orig_tb; + tb_unlock(); + + /* execute the generated code */ + trace_exec_tb_nocache(tb, tb->pc); + cpu_tb_exec(cpu, tb); + + tb_lock(); + tb_phys_invalidate(tb, -1); + tb_free(tb); + tb_unlock(); +} +#endif + +static void cpu_exec_step(CPUState *cpu) +{ + CPUClass *cc = CPU_GET_CLASS(cpu); + CPUArchState *env = (CPUArchState *)cpu->env_ptr; + TranslationBlock *tb; + target_ulong cs_base, pc; + uint32_t flags; + + cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags); + if (sigsetjmp(cpu->jmp_env, 0) == 0) { + mmap_lock(); + tb_lock(); + tb = tb_gen_code(cpu, pc, cs_base, flags, + 1 | CF_NOCACHE | CF_IGNORE_ICOUNT); + tb->orig_tb = NULL; + tb_unlock(); + mmap_unlock(); + + cc->cpu_exec_enter(cpu); + /* execute the generated code */ + trace_exec_tb_nocache(tb, pc); + cpu_tb_exec(cpu, tb); + cc->cpu_exec_exit(cpu); + + tb_lock(); + tb_phys_invalidate(tb, -1); + tb_free(tb); + tb_unlock(); + } else { + /* We may have exited due to another problem here, so we need + * to reset any tb_locks we may have taken but didn't release. + * The mmap_lock is dropped by tb_gen_code if it runs out of + * memory. + */ +#ifndef CONFIG_SOFTMMU + tcg_debug_assert(!have_mmap_lock()); +#endif + tb_lock_reset(); + } +} + +void cpu_exec_step_atomic(CPUState *cpu) +{ + start_exclusive(); + + /* Since we got here, we know that parallel_cpus must be true. */ + parallel_cpus = false; + cpu_exec_step(cpu); + parallel_cpus = true; + + end_exclusive(); +} + +struct tb_desc { + target_ulong pc; + target_ulong cs_base; + CPUArchState *env; + tb_page_addr_t phys_page1; + uint32_t flags; +}; + +static bool tb_cmp(const void *p, const void *d) +{ + const TranslationBlock *tb = p; + const struct tb_desc *desc = d; + + if (tb->pc == desc->pc && + tb->page_addr[0] == desc->phys_page1 && + tb->cs_base == desc->cs_base && + tb->flags == desc->flags && + !atomic_read(&tb->invalid)) { + /* check next page if needed */ + if (tb->page_addr[1] == -1) { + return true; + } else { + tb_page_addr_t phys_page2; + target_ulong virt_page2; + + virt_page2 = (desc->pc & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; + phys_page2 = get_page_addr_code(desc->env, virt_page2); + if (tb->page_addr[1] == phys_page2) { + return true; + } + } + } + return false; +} + +static TranslationBlock *tb_htable_lookup(CPUState *cpu, + target_ulong pc, + target_ulong cs_base, + uint32_t flags) +{ + tb_page_addr_t phys_pc; + struct tb_desc desc; + uint32_t h; + + desc.env = (CPUArchState *)cpu->env_ptr; + desc.cs_base = cs_base; + desc.flags = flags; + desc.pc = pc; + phys_pc = get_page_addr_code(desc.env, pc); + desc.phys_page1 = phys_pc & TARGET_PAGE_MASK; + h = tb_hash_func(phys_pc, pc, flags); + return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h); +} + +static inline TranslationBlock *tb_find(CPUState *cpu, + TranslationBlock *last_tb, + int tb_exit) +{ + CPUArchState *env = (CPUArchState *)cpu->env_ptr; + TranslationBlock *tb; + target_ulong cs_base, pc; + uint32_t flags; + bool have_tb_lock = false; + + /* we record a subset of the CPU state. It will + always be the same before a given translated block + is executed. */ + cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags); + tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]); + if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base || + tb->flags != flags)) { + tb = tb_htable_lookup(cpu, pc, cs_base, flags); + if (!tb) { + + /* mmap_lock is needed by tb_gen_code, and mmap_lock must be + * taken outside tb_lock. As system emulation is currently + * single threaded the locks are NOPs. + */ + mmap_lock(); + tb_lock(); + have_tb_lock = true; + + /* There's a chance that our desired tb has been translated while + * taking the locks so we check again inside the lock. + */ + tb = tb_htable_lookup(cpu, pc, cs_base, flags); + if (!tb) { + /* if no translated code available, then translate it now */ + tb = tb_gen_code(cpu, pc, cs_base, flags, 0); + } + + mmap_unlock(); + } + + /* We add the TB in the virtual pc hash table for the fast lookup */ + atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb); + } +#ifndef CONFIG_USER_ONLY + /* We don't take care of direct jumps when address mapping changes in + * system emulation. So it's not safe to make a direct jump to a TB + * spanning two pages because the mapping for the second page can change. + */ + if (tb->page_addr[1] != -1) { + last_tb = NULL; + } +#endif + /* See if we can patch the calling TB. */ + if (last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) { + if (!have_tb_lock) { + tb_lock(); + have_tb_lock = true; + } + if (!tb->invalid) { + tb_add_jump(last_tb, tb_exit, tb); + } + } + if (have_tb_lock) { + tb_unlock(); + } + return tb; +} + +static inline bool cpu_handle_halt(CPUState *cpu) +{ + if (cpu->halted) { +#if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY) + if ((cpu->interrupt_request & CPU_INTERRUPT_POLL) + && replay_interrupt()) { + X86CPU *x86_cpu = X86_CPU(cpu); + qemu_mutex_lock_iothread(); + apic_poll_irq(x86_cpu->apic_state); + cpu_reset_interrupt(cpu, CPU_INTERRUPT_POLL); + qemu_mutex_unlock_iothread(); + } +#endif + if (!cpu_has_work(cpu)) { + return true; + } + + cpu->halted = 0; + } + + return false; +} + +static inline void cpu_handle_debug_exception(CPUState *cpu) +{ + CPUClass *cc = CPU_GET_CLASS(cpu); + CPUWatchpoint *wp; + + if (!cpu->watchpoint_hit) { + QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { + wp->flags &= ~BP_WATCHPOINT_HIT; + } + } + + cc->debug_excp_handler(cpu); +} + +static inline bool cpu_handle_exception(CPUState *cpu, int *ret) +{ + if (cpu->exception_index >= 0) { + if (cpu->exception_index >= EXCP_INTERRUPT) { + /* exit request from the cpu execution loop */ + *ret = cpu->exception_index; + if (*ret == EXCP_DEBUG) { + cpu_handle_debug_exception(cpu); + } + cpu->exception_index = -1; + return true; + } else { +#if defined(CONFIG_USER_ONLY) + /* if user mode only, we simulate a fake exception + which will be handled outside the cpu execution + loop */ +#if defined(TARGET_I386) + CPUClass *cc = CPU_GET_CLASS(cpu); + cc->do_interrupt(cpu); +#endif + *ret = cpu->exception_index; + cpu->exception_index = -1; + return true; +#else + if (replay_exception()) { + CPUClass *cc = CPU_GET_CLASS(cpu); + qemu_mutex_lock_iothread(); + cc->do_interrupt(cpu); + qemu_mutex_unlock_iothread(); + cpu->exception_index = -1; + } else if (!replay_has_interrupt()) { + /* give a chance to iothread in replay mode */ + *ret = EXCP_INTERRUPT; + return true; + } +#endif + } +#ifndef CONFIG_USER_ONLY + } else if (replay_has_exception() + && cpu->icount_decr.u16.low + cpu->icount_extra == 0) { + /* try to cause an exception pending in the log */ + cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0), true); + *ret = -1; + return true; +#endif + } + + return false; +} + +static inline bool cpu_handle_interrupt(CPUState *cpu, + TranslationBlock **last_tb) +{ + CPUClass *cc = CPU_GET_CLASS(cpu); + + if (unlikely(atomic_read(&cpu->interrupt_request))) { + int interrupt_request; + qemu_mutex_lock_iothread(); + interrupt_request = cpu->interrupt_request; + if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) { + /* Mask out external interrupts for this step. */ + interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK; + } + if (interrupt_request & CPU_INTERRUPT_DEBUG) { + cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG; + cpu->exception_index = EXCP_DEBUG; + qemu_mutex_unlock_iothread(); + return true; + } + if (replay_mode == REPLAY_MODE_PLAY && !replay_has_interrupt()) { + /* Do nothing */ + } else if (interrupt_request & CPU_INTERRUPT_HALT) { + replay_interrupt(); + cpu->interrupt_request &= ~CPU_INTERRUPT_HALT; + cpu->halted = 1; + cpu->exception_index = EXCP_HLT; + qemu_mutex_unlock_iothread(); + return true; + } +#if defined(TARGET_I386) + else if (interrupt_request & CPU_INTERRUPT_INIT) { + X86CPU *x86_cpu = X86_CPU(cpu); + CPUArchState *env = &x86_cpu->env; + replay_interrupt(); + cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, 0, 0); + do_cpu_init(x86_cpu); + cpu->exception_index = EXCP_HALTED; + qemu_mutex_unlock_iothread(); + return true; + } +#else + else if (interrupt_request & CPU_INTERRUPT_RESET) { + replay_interrupt(); + cpu_reset(cpu); + qemu_mutex_unlock_iothread(); + return true; + } +#endif + /* The target hook has 3 exit conditions: + False when the interrupt isn't processed, + True when it is, and we should restart on a new TB, + and via longjmp via cpu_loop_exit. */ + else { + if (cc->cpu_exec_interrupt(cpu, interrupt_request)) { + replay_interrupt(); + *last_tb = NULL; + } + /* The target hook may have updated the 'cpu->interrupt_request'; + * reload the 'interrupt_request' value */ + interrupt_request = cpu->interrupt_request; + } + if (interrupt_request & CPU_INTERRUPT_EXITTB) { + cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB; + /* ensure that no TB jump will be modified as + the program flow was changed */ + *last_tb = NULL; + } + + /* If we exit via cpu_loop_exit/longjmp it is reset in cpu_exec */ + qemu_mutex_unlock_iothread(); + } + + /* Finally, check if we need to exit to the main loop. */ + if (unlikely(atomic_read(&cpu->exit_request) + || (use_icount && cpu->icount_decr.u16.low + cpu->icount_extra == 0))) { + atomic_set(&cpu->exit_request, 0); + cpu->exception_index = EXCP_INTERRUPT; + return true; + } + + return false; +} + +static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb, + TranslationBlock **last_tb, int *tb_exit) +{ + uintptr_t ret; + int32_t insns_left; + + trace_exec_tb(tb, tb->pc); + ret = cpu_tb_exec(cpu, tb); + tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); + *tb_exit = ret & TB_EXIT_MASK; + if (*tb_exit != TB_EXIT_REQUESTED) { + *last_tb = tb; + return; + } + + *last_tb = NULL; + insns_left = atomic_read(&cpu->icount_decr.u32); + atomic_set(&cpu->icount_decr.u16.high, 0); + if (insns_left < 0) { + /* Something asked us to stop executing chained TBs; just + * continue round the main loop. Whatever requested the exit + * will also have set something else (eg exit_request or + * interrupt_request) which we will handle next time around + * the loop. But we need to ensure the zeroing of icount_decr + * comes before the next read of cpu->exit_request + * or cpu->interrupt_request. + */ + smp_mb(); + return; + } + + /* Instruction counter expired. */ + assert(use_icount); +#ifndef CONFIG_USER_ONLY + /* Ensure global icount has gone forward */ + cpu_update_icount(cpu); + /* Refill decrementer and continue execution. */ + insns_left = MIN(0xffff, cpu->icount_budget); + cpu->icount_decr.u16.low = insns_left; + cpu->icount_extra = cpu->icount_budget - insns_left; + if (!cpu->icount_extra) { + /* Execute any remaining instructions, then let the main loop + * handle the next event. + */ + if (insns_left > 0) { + cpu_exec_nocache(cpu, insns_left, tb, false); + } + } +#endif +} + +/* main execution loop */ + +int cpu_exec(CPUState *cpu) +{ + CPUClass *cc = CPU_GET_CLASS(cpu); + int ret; + SyncClocks sc = { 0 }; + + /* replay_interrupt may need current_cpu */ + current_cpu = cpu; + + if (cpu_handle_halt(cpu)) { + return EXCP_HALTED; + } + + rcu_read_lock(); + + cc->cpu_exec_enter(cpu); + + /* Calculate difference between guest clock and host clock. + * This delay includes the delay of the last cycle, so + * what we have to do is sleep until it is 0. As for the + * advance/delay we gain here, we try to fix it next time. + */ + init_delay_params(&sc, cpu); + + /* prepare setjmp context for exception handling */ + if (sigsetjmp(cpu->jmp_env, 0) != 0) { +#if defined(__clang__) || !QEMU_GNUC_PREREQ(4, 6) + /* Some compilers wrongly smash all local variables after + * siglongjmp. There were bug reports for gcc 4.5.0 and clang. + * Reload essential local variables here for those compilers. + * Newer versions of gcc would complain about this code (-Wclobbered). */ + cpu = current_cpu; + cc = CPU_GET_CLASS(cpu); +#else /* buggy compiler */ + /* Assert that the compiler does not smash local variables. */ + g_assert(cpu == current_cpu); + g_assert(cc == CPU_GET_CLASS(cpu)); +#endif /* buggy compiler */ + cpu->can_do_io = 1; + tb_lock_reset(); + if (qemu_mutex_iothread_locked()) { + qemu_mutex_unlock_iothread(); + } + } + + /* if an exception is pending, we execute it here */ + while (!cpu_handle_exception(cpu, &ret)) { + TranslationBlock *last_tb = NULL; + int tb_exit = 0; + + while (!cpu_handle_interrupt(cpu, &last_tb)) { + TranslationBlock *tb = tb_find(cpu, last_tb, tb_exit); + cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit); + /* Try to align the host and virtual clocks + if the guest is in advance */ + align_clocks(&sc, cpu); + } + } + + cc->cpu_exec_exit(cpu); + rcu_read_unlock(); + + return ret; +} diff --git a/accel/tcg/trace-events b/accel/tcg/trace-events new file mode 100644 index 0000000..f2db388 --- /dev/null +++ b/accel/tcg/trace-events @@ -0,0 +1,7 @@ +# Trace events for debugging and performance instrumentation + +# TCG related tracing (mostly disabled by default) +# cpu-exec.c +disable exec_tb(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR +disable exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR +disable exec_tb_exit(void *last_tb, unsigned int flags) "tb:%p flags=%x" diff --git a/cpu-exec.c b/cpu-exec.c deleted file mode 100644 index 63a56d0..0000000 --- a/cpu-exec.c +++ /dev/null @@ -1,685 +0,0 @@ -/* - * emulator main execution loop - * - * Copyright (c) 2003-2005 Fabrice Bellard - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see . - */ -#include "qemu/osdep.h" -#include "cpu.h" -#include "trace-root.h" -#include "disas/disas.h" -#include "exec/exec-all.h" -#include "tcg.h" -#include "qemu/atomic.h" -#include "sysemu/qtest.h" -#include "qemu/timer.h" -#include "exec/address-spaces.h" -#include "qemu/rcu.h" -#include "exec/tb-hash.h" -#include "exec/log.h" -#include "qemu/main-loop.h" -#if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY) -#include "hw/i386/apic.h" -#endif -#include "sysemu/cpus.h" -#include "sysemu/replay.h" - -/* -icount align implementation. */ - -typedef struct SyncClocks { - int64_t diff_clk; - int64_t last_cpu_icount; - int64_t realtime_clock; -} SyncClocks; - -#if !defined(CONFIG_USER_ONLY) -/* Allow the guest to have a max 3ms advance. - * The difference between the 2 clocks could therefore - * oscillate around 0. - */ -#define VM_CLOCK_ADVANCE 3000000 -#define THRESHOLD_REDUCE 1.5 -#define MAX_DELAY_PRINT_RATE 2000000000LL -#define MAX_NB_PRINTS 100 - -static void align_clocks(SyncClocks *sc, const CPUState *cpu) -{ - int64_t cpu_icount; - - if (!icount_align_option) { - return; - } - - cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low; - sc->diff_clk += cpu_icount_to_ns(sc->last_cpu_icount - cpu_icount); - sc->last_cpu_icount = cpu_icount; - - if (sc->diff_clk > VM_CLOCK_ADVANCE) { -#ifndef _WIN32 - struct timespec sleep_delay, rem_delay; - sleep_delay.tv_sec = sc->diff_clk / 1000000000LL; - sleep_delay.tv_nsec = sc->diff_clk % 1000000000LL; - if (nanosleep(&sleep_delay, &rem_delay) < 0) { - sc->diff_clk = rem_delay.tv_sec * 1000000000LL + rem_delay.tv_nsec; - } else { - sc->diff_clk = 0; - } -#else - Sleep(sc->diff_clk / SCALE_MS); - sc->diff_clk = 0; -#endif - } -} - -static void print_delay(const SyncClocks *sc) -{ - static float threshold_delay; - static int64_t last_realtime_clock; - static int nb_prints; - - if (icount_align_option && - sc->realtime_clock - last_realtime_clock >= MAX_DELAY_PRINT_RATE && - nb_prints < MAX_NB_PRINTS) { - if ((-sc->diff_clk / (float)1000000000LL > threshold_delay) || - (-sc->diff_clk / (float)1000000000LL < - (threshold_delay - THRESHOLD_REDUCE))) { - threshold_delay = (-sc->diff_clk / 1000000000LL) + 1; - printf("Warning: The guest is now late by %.1f to %.1f seconds\n", - threshold_delay - 1, - threshold_delay); - nb_prints++; - last_realtime_clock = sc->realtime_clock; - } - } -} - -static void init_delay_params(SyncClocks *sc, - const CPUState *cpu) -{ - if (!icount_align_option) { - return; - } - sc->realtime_clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT); - sc->diff_clk = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - sc->realtime_clock; - sc->last_cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low; - if (sc->diff_clk < max_delay) { - max_delay = sc->diff_clk; - } - if (sc->diff_clk > max_advance) { - max_advance = sc->diff_clk; - } - - /* Print every 2s max if the guest is late. We limit the number - of printed messages to NB_PRINT_MAX(currently 100) */ - print_delay(sc); -} -#else -static void align_clocks(SyncClocks *sc, const CPUState *cpu) -{ -} - -static void init_delay_params(SyncClocks *sc, const CPUState *cpu) -{ -} -#endif /* CONFIG USER ONLY */ - -/* Execute a TB, and fix up the CPU state afterwards if necessary */ -static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb) -{ - CPUArchState *env = cpu->env_ptr; - uintptr_t ret; - TranslationBlock *last_tb; - int tb_exit; - uint8_t *tb_ptr = itb->tc_ptr; - - qemu_log_mask_and_addr(CPU_LOG_EXEC, itb->pc, - "Trace %p [%d: " TARGET_FMT_lx "] %s\n", - itb->tc_ptr, cpu->cpu_index, itb->pc, - lookup_symbol(itb->pc)); - -#if defined(DEBUG_DISAS) - if (qemu_loglevel_mask(CPU_LOG_TB_CPU) - && qemu_log_in_addr_range(itb->pc)) { - qemu_log_lock(); -#if defined(TARGET_I386) - log_cpu_state(cpu, CPU_DUMP_CCOP); -#else - log_cpu_state(cpu, 0); -#endif - qemu_log_unlock(); - } -#endif /* DEBUG_DISAS */ - - cpu->can_do_io = !use_icount; - ret = tcg_qemu_tb_exec(env, tb_ptr); - cpu->can_do_io = 1; - last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); - tb_exit = ret & TB_EXIT_MASK; - trace_exec_tb_exit(last_tb, tb_exit); - - if (tb_exit > TB_EXIT_IDX1) { - /* We didn't start executing this TB (eg because the instruction - * counter hit zero); we must restore the guest PC to the address - * of the start of the TB. - */ - CPUClass *cc = CPU_GET_CLASS(cpu); - qemu_log_mask_and_addr(CPU_LOG_EXEC, last_tb->pc, - "Stopped execution of TB chain before %p [" - TARGET_FMT_lx "] %s\n", - last_tb->tc_ptr, last_tb->pc, - lookup_symbol(last_tb->pc)); - if (cc->synchronize_from_tb) { - cc->synchronize_from_tb(cpu, last_tb); - } else { - assert(cc->set_pc); - cc->set_pc(cpu, last_tb->pc); - } - } - return ret; -} - -#ifndef CONFIG_USER_ONLY -/* Execute the code without caching the generated code. An interpreter - could be used if available. */ -static void cpu_exec_nocache(CPUState *cpu, int max_cycles, - TranslationBlock *orig_tb, bool ignore_icount) -{ - TranslationBlock *tb; - - /* Should never happen. - We only end up here when an existing TB is too long. */ - if (max_cycles > CF_COUNT_MASK) - max_cycles = CF_COUNT_MASK; - - tb_lock(); - tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags, - max_cycles | CF_NOCACHE - | (ignore_icount ? CF_IGNORE_ICOUNT : 0)); - tb->orig_tb = orig_tb; - tb_unlock(); - - /* execute the generated code */ - trace_exec_tb_nocache(tb, tb->pc); - cpu_tb_exec(cpu, tb); - - tb_lock(); - tb_phys_invalidate(tb, -1); - tb_free(tb); - tb_unlock(); -} -#endif - -static void cpu_exec_step(CPUState *cpu) -{ - CPUClass *cc = CPU_GET_CLASS(cpu); - CPUArchState *env = (CPUArchState *)cpu->env_ptr; - TranslationBlock *tb; - target_ulong cs_base, pc; - uint32_t flags; - - cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags); - if (sigsetjmp(cpu->jmp_env, 0) == 0) { - mmap_lock(); - tb_lock(); - tb = tb_gen_code(cpu, pc, cs_base, flags, - 1 | CF_NOCACHE | CF_IGNORE_ICOUNT); - tb->orig_tb = NULL; - tb_unlock(); - mmap_unlock(); - - cc->cpu_exec_enter(cpu); - /* execute the generated code */ - trace_exec_tb_nocache(tb, pc); - cpu_tb_exec(cpu, tb); - cc->cpu_exec_exit(cpu); - - tb_lock(); - tb_phys_invalidate(tb, -1); - tb_free(tb); - tb_unlock(); - } else { - /* We may have exited due to another problem here, so we need - * to reset any tb_locks we may have taken but didn't release. - * The mmap_lock is dropped by tb_gen_code if it runs out of - * memory. - */ -#ifndef CONFIG_SOFTMMU - tcg_debug_assert(!have_mmap_lock()); -#endif - tb_lock_reset(); - } -} - -void cpu_exec_step_atomic(CPUState *cpu) -{ - start_exclusive(); - - /* Since we got here, we know that parallel_cpus must be true. */ - parallel_cpus = false; - cpu_exec_step(cpu); - parallel_cpus = true; - - end_exclusive(); -} - -struct tb_desc { - target_ulong pc; - target_ulong cs_base; - CPUArchState *env; - tb_page_addr_t phys_page1; - uint32_t flags; -}; - -static bool tb_cmp(const void *p, const void *d) -{ - const TranslationBlock *tb = p; - const struct tb_desc *desc = d; - - if (tb->pc == desc->pc && - tb->page_addr[0] == desc->phys_page1 && - tb->cs_base == desc->cs_base && - tb->flags == desc->flags && - !atomic_read(&tb->invalid)) { - /* check next page if needed */ - if (tb->page_addr[1] == -1) { - return true; - } else { - tb_page_addr_t phys_page2; - target_ulong virt_page2; - - virt_page2 = (desc->pc & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; - phys_page2 = get_page_addr_code(desc->env, virt_page2); - if (tb->page_addr[1] == phys_page2) { - return true; - } - } - } - return false; -} - -static TranslationBlock *tb_htable_lookup(CPUState *cpu, - target_ulong pc, - target_ulong cs_base, - uint32_t flags) -{ - tb_page_addr_t phys_pc; - struct tb_desc desc; - uint32_t h; - - desc.env = (CPUArchState *)cpu->env_ptr; - desc.cs_base = cs_base; - desc.flags = flags; - desc.pc = pc; - phys_pc = get_page_addr_code(desc.env, pc); - desc.phys_page1 = phys_pc & TARGET_PAGE_MASK; - h = tb_hash_func(phys_pc, pc, flags); - return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h); -} - -static inline TranslationBlock *tb_find(CPUState *cpu, - TranslationBlock *last_tb, - int tb_exit) -{ - CPUArchState *env = (CPUArchState *)cpu->env_ptr; - TranslationBlock *tb; - target_ulong cs_base, pc; - uint32_t flags; - bool have_tb_lock = false; - - /* we record a subset of the CPU state. It will - always be the same before a given translated block - is executed. */ - cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags); - tb = atomic_rcu_read(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]); - if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base || - tb->flags != flags)) { - tb = tb_htable_lookup(cpu, pc, cs_base, flags); - if (!tb) { - - /* mmap_lock is needed by tb_gen_code, and mmap_lock must be - * taken outside tb_lock. As system emulation is currently - * single threaded the locks are NOPs. - */ - mmap_lock(); - tb_lock(); - have_tb_lock = true; - - /* There's a chance that our desired tb has been translated while - * taking the locks so we check again inside the lock. - */ - tb = tb_htable_lookup(cpu, pc, cs_base, flags); - if (!tb) { - /* if no translated code available, then translate it now */ - tb = tb_gen_code(cpu, pc, cs_base, flags, 0); - } - - mmap_unlock(); - } - - /* We add the TB in the virtual pc hash table for the fast lookup */ - atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb); - } -#ifndef CONFIG_USER_ONLY - /* We don't take care of direct jumps when address mapping changes in - * system emulation. So it's not safe to make a direct jump to a TB - * spanning two pages because the mapping for the second page can change. - */ - if (tb->page_addr[1] != -1) { - last_tb = NULL; - } -#endif - /* See if we can patch the calling TB. */ - if (last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) { - if (!have_tb_lock) { - tb_lock(); - have_tb_lock = true; - } - if (!tb->invalid) { - tb_add_jump(last_tb, tb_exit, tb); - } - } - if (have_tb_lock) { - tb_unlock(); - } - return tb; -} - -static inline bool cpu_handle_halt(CPUState *cpu) -{ - if (cpu->halted) { -#if defined(TARGET_I386) && !defined(CONFIG_USER_ONLY) - if ((cpu->interrupt_request & CPU_INTERRUPT_POLL) - && replay_interrupt()) { - X86CPU *x86_cpu = X86_CPU(cpu); - qemu_mutex_lock_iothread(); - apic_poll_irq(x86_cpu->apic_state); - cpu_reset_interrupt(cpu, CPU_INTERRUPT_POLL); - qemu_mutex_unlock_iothread(); - } -#endif - if (!cpu_has_work(cpu)) { - return true; - } - - cpu->halted = 0; - } - - return false; -} - -static inline void cpu_handle_debug_exception(CPUState *cpu) -{ - CPUClass *cc = CPU_GET_CLASS(cpu); - CPUWatchpoint *wp; - - if (!cpu->watchpoint_hit) { - QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { - wp->flags &= ~BP_WATCHPOINT_HIT; - } - } - - cc->debug_excp_handler(cpu); -} - -static inline bool cpu_handle_exception(CPUState *cpu, int *ret) -{ - if (cpu->exception_index >= 0) { - if (cpu->exception_index >= EXCP_INTERRUPT) { - /* exit request from the cpu execution loop */ - *ret = cpu->exception_index; - if (*ret == EXCP_DEBUG) { - cpu_handle_debug_exception(cpu); - } - cpu->exception_index = -1; - return true; - } else { -#if defined(CONFIG_USER_ONLY) - /* if user mode only, we simulate a fake exception - which will be handled outside the cpu execution - loop */ -#if defined(TARGET_I386) - CPUClass *cc = CPU_GET_CLASS(cpu); - cc->do_interrupt(cpu); -#endif - *ret = cpu->exception_index; - cpu->exception_index = -1; - return true; -#else - if (replay_exception()) { - CPUClass *cc = CPU_GET_CLASS(cpu); - qemu_mutex_lock_iothread(); - cc->do_interrupt(cpu); - qemu_mutex_unlock_iothread(); - cpu->exception_index = -1; - } else if (!replay_has_interrupt()) { - /* give a chance to iothread in replay mode */ - *ret = EXCP_INTERRUPT; - return true; - } -#endif - } -#ifndef CONFIG_USER_ONLY - } else if (replay_has_exception() - && cpu->icount_decr.u16.low + cpu->icount_extra == 0) { - /* try to cause an exception pending in the log */ - cpu_exec_nocache(cpu, 1, tb_find(cpu, NULL, 0), true); - *ret = -1; - return true; -#endif - } - - return false; -} - -static inline bool cpu_handle_interrupt(CPUState *cpu, - TranslationBlock **last_tb) -{ - CPUClass *cc = CPU_GET_CLASS(cpu); - - if (unlikely(atomic_read(&cpu->interrupt_request))) { - int interrupt_request; - qemu_mutex_lock_iothread(); - interrupt_request = cpu->interrupt_request; - if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) { - /* Mask out external interrupts for this step. */ - interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK; - } - if (interrupt_request & CPU_INTERRUPT_DEBUG) { - cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG; - cpu->exception_index = EXCP_DEBUG; - qemu_mutex_unlock_iothread(); - return true; - } - if (replay_mode == REPLAY_MODE_PLAY && !replay_has_interrupt()) { - /* Do nothing */ - } else if (interrupt_request & CPU_INTERRUPT_HALT) { - replay_interrupt(); - cpu->interrupt_request &= ~CPU_INTERRUPT_HALT; - cpu->halted = 1; - cpu->exception_index = EXCP_HLT; - qemu_mutex_unlock_iothread(); - return true; - } -#if defined(TARGET_I386) - else if (interrupt_request & CPU_INTERRUPT_INIT) { - X86CPU *x86_cpu = X86_CPU(cpu); - CPUArchState *env = &x86_cpu->env; - replay_interrupt(); - cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, 0, 0); - do_cpu_init(x86_cpu); - cpu->exception_index = EXCP_HALTED; - qemu_mutex_unlock_iothread(); - return true; - } -#else - else if (interrupt_request & CPU_INTERRUPT_RESET) { - replay_interrupt(); - cpu_reset(cpu); - qemu_mutex_unlock_iothread(); - return true; - } -#endif - /* The target hook has 3 exit conditions: - False when the interrupt isn't processed, - True when it is, and we should restart on a new TB, - and via longjmp via cpu_loop_exit. */ - else { - if (cc->cpu_exec_interrupt(cpu, interrupt_request)) { - replay_interrupt(); - *last_tb = NULL; - } - /* The target hook may have updated the 'cpu->interrupt_request'; - * reload the 'interrupt_request' value */ - interrupt_request = cpu->interrupt_request; - } - if (interrupt_request & CPU_INTERRUPT_EXITTB) { - cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB; - /* ensure that no TB jump will be modified as - the program flow was changed */ - *last_tb = NULL; - } - - /* If we exit via cpu_loop_exit/longjmp it is reset in cpu_exec */ - qemu_mutex_unlock_iothread(); - } - - /* Finally, check if we need to exit to the main loop. */ - if (unlikely(atomic_read(&cpu->exit_request) - || (use_icount && cpu->icount_decr.u16.low + cpu->icount_extra == 0))) { - atomic_set(&cpu->exit_request, 0); - cpu->exception_index = EXCP_INTERRUPT; - return true; - } - - return false; -} - -static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb, - TranslationBlock **last_tb, int *tb_exit) -{ - uintptr_t ret; - int32_t insns_left; - - trace_exec_tb(tb, tb->pc); - ret = cpu_tb_exec(cpu, tb); - tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); - *tb_exit = ret & TB_EXIT_MASK; - if (*tb_exit != TB_EXIT_REQUESTED) { - *last_tb = tb; - return; - } - - *last_tb = NULL; - insns_left = atomic_read(&cpu->icount_decr.u32); - atomic_set(&cpu->icount_decr.u16.high, 0); - if (insns_left < 0) { - /* Something asked us to stop executing chained TBs; just - * continue round the main loop. Whatever requested the exit - * will also have set something else (eg exit_request or - * interrupt_request) which we will handle next time around - * the loop. But we need to ensure the zeroing of icount_decr - * comes before the next read of cpu->exit_request - * or cpu->interrupt_request. - */ - smp_mb(); - return; - } - - /* Instruction counter expired. */ - assert(use_icount); -#ifndef CONFIG_USER_ONLY - /* Ensure global icount has gone forward */ - cpu_update_icount(cpu); - /* Refill decrementer and continue execution. */ - insns_left = MIN(0xffff, cpu->icount_budget); - cpu->icount_decr.u16.low = insns_left; - cpu->icount_extra = cpu->icount_budget - insns_left; - if (!cpu->icount_extra) { - /* Execute any remaining instructions, then let the main loop - * handle the next event. - */ - if (insns_left > 0) { - cpu_exec_nocache(cpu, insns_left, tb, false); - } - } -#endif -} - -/* main execution loop */ - -int cpu_exec(CPUState *cpu) -{ - CPUClass *cc = CPU_GET_CLASS(cpu); - int ret; - SyncClocks sc = { 0 }; - - /* replay_interrupt may need current_cpu */ - current_cpu = cpu; - - if (cpu_handle_halt(cpu)) { - return EXCP_HALTED; - } - - rcu_read_lock(); - - cc->cpu_exec_enter(cpu); - - /* Calculate difference between guest clock and host clock. - * This delay includes the delay of the last cycle, so - * what we have to do is sleep until it is 0. As for the - * advance/delay we gain here, we try to fix it next time. - */ - init_delay_params(&sc, cpu); - - /* prepare setjmp context for exception handling */ - if (sigsetjmp(cpu->jmp_env, 0) != 0) { -#if defined(__clang__) || !QEMU_GNUC_PREREQ(4, 6) - /* Some compilers wrongly smash all local variables after - * siglongjmp. There were bug reports for gcc 4.5.0 and clang. - * Reload essential local variables here for those compilers. - * Newer versions of gcc would complain about this code (-Wclobbered). */ - cpu = current_cpu; - cc = CPU_GET_CLASS(cpu); -#else /* buggy compiler */ - /* Assert that the compiler does not smash local variables. */ - g_assert(cpu == current_cpu); - g_assert(cc == CPU_GET_CLASS(cpu)); -#endif /* buggy compiler */ - cpu->can_do_io = 1; - tb_lock_reset(); - if (qemu_mutex_iothread_locked()) { - qemu_mutex_unlock_iothread(); - } - } - - /* if an exception is pending, we execute it here */ - while (!cpu_handle_exception(cpu, &ret)) { - TranslationBlock *last_tb = NULL; - int tb_exit = 0; - - while (!cpu_handle_interrupt(cpu, &last_tb)) { - TranslationBlock *tb = tb_find(cpu, last_tb, tb_exit); - cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit); - /* Try to align the host and virtual clocks - if the guest is in advance */ - align_clocks(&sc, cpu); - } - } - - cc->cpu_exec_exit(cpu); - rcu_read_unlock(); - - return ret; -} diff --git a/trace-events b/trace-events index e582d63..153942d 100644 --- a/trace-events +++ b/trace-events @@ -73,11 +73,6 @@ kvm_irqchip_add_msi_route(int virq) "Adding MSI route virq=%d" kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d" # TCG related tracing (mostly disabled by default) -# cpu-exec.c -disable exec_tb(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR -disable exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR -disable exec_tb_exit(void *last_tb, unsigned int flags) "tb:%p flags=%x" - # translate-all.c translate_block(void *tb, uintptr_t pc, uint8_t *tb_code) "tb:%p, pc:0x%"PRIxPTR", tb_code:%p"