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https://github.com/yuzu-emu/unicorn.git
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784d580f01
Under some circumstances, the PC is not fixed up properly when returning from the execution of a block in cpu_tb_exec. This appears to be caused by the resetting of the PC from the tb. This change removes the additional fixup in the cases where there is code tracing or timing active. Either of these cases would result in the wrong PC being reported. Closes unicorn-engine#1105. Backports commit b59632fb645d456338472e3d757c065c0ed74ad5 from unicorn
602 lines
20 KiB
C
602 lines
20 KiB
C
/*
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* emulator main execution loop
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* Modified for Unicorn Engine by Nguyen Anh Quynh, 2015 */
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "tcg.h"
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#include "qemu/atomic.h"
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#include "qemu/timer.h"
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#include "sysemu/sysemu.h"
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#include "exec/address-spaces.h"
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#include "exec/tb-hash.h"
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#include "exec/tb-lookup.h"
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#include "uc_priv.h"
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/* Execute a TB, and fix up the CPU state afterwards if necessary */
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static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, TranslationBlock *itb)
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{
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CPUArchState *env = cpu->env_ptr;
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TCGContext *tcg_ctx = env->uc->tcg_ctx;
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uintptr_t ret;
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TranslationBlock *last_tb;
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int tb_exit;
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uint8_t *tb_ptr = itb->tc.ptr;
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ret = tcg_qemu_tb_exec(env, tb_ptr);
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cpu->can_do_io = 1;
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last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK);
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tb_exit = ret & TB_EXIT_MASK;
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//trace_exec_tb_exit(last_tb, tb_exit);
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if (tb_exit > TB_EXIT_IDX1) {
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/* We didn't start executing this TB (eg because the instruction
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* counter hit zero); we must restore the guest PC to the address
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* of the start of the TB.
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*/
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CPUClass *cc = CPU_GET_CLASS(env->uc, cpu);
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/*
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* Both set_pc() & synchronize_fromtb() can be ignored when code tracing hook is installed,
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* or timer mode is in effect, since these already fix the PC.
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*/
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if (!HOOK_EXISTS(env->uc, UC_HOOK_CODE) && !env->uc->timeout) {
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if (cc->synchronize_from_tb) {
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// avoid sync twice when helper_uc_tracecode() already did this.
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if (env->uc->emu_counter <= env->uc->emu_count &&
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!env->uc->stop_request && !env->uc->quit_request)
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cc->synchronize_from_tb(cpu, last_tb);
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} else {
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assert(cc->set_pc);
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// avoid sync twice when helper_uc_tracecode() already did this.
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if (env->uc->emu_counter <= env->uc->emu_count &&
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!env->uc->stop_request && !env->uc->quit_request)
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cc->set_pc(cpu, last_tb->pc);
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}
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}
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}
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if (tb_exit == TB_EXIT_REQUESTED) {
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/* We were asked to stop executing TBs (probably a pending
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* interrupt. We've now stopped, so clear the flag.
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*/
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atomic_set(&cpu->tcg_exit_req, 0);
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}
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return ret;
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}
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#ifndef CONFIG_USER_ONLY
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/* Execute the code without caching the generated code. An interpreter
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could be used if available. */
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static void cpu_exec_nocache(CPUState *cpu, int max_cycles,
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TranslationBlock *orig_tb, bool ignore_icount)
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{
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TranslationBlock *tb;
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CPUArchState *env = (CPUArchState *)cpu->env_ptr;
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uint32_t cflags = curr_cflags(cpu->uc) | CF_NOCACHE;
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if (ignore_icount) {
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cflags &= ~CF_USE_ICOUNT;
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}
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/* Should never happen.
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We only end up here when an existing TB is too long. */
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cflags |= MIN(max_cycles, CF_COUNT_MASK);
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mmap_lock();
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tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base,
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orig_tb->flags, cflags);
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tb->orig_tb = orig_tb;
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mmap_unlock();
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/* execute the generated code */
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cpu_tb_exec(cpu, tb);
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mmap_lock();
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tb_phys_invalidate(env->uc, tb, -1);
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mmap_unlock();
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tb_free(env->uc, tb);
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}
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#endif
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TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
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target_ulong cs_base, uint32_t flags,
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uint32_t cf_mask)
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{
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TCGContext *tcg_ctx = cpu->uc->tcg_ctx;
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CPUArchState *env = (CPUArchState *)cpu->env_ptr;
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TranslationBlock *tb, **tb_hash_head, **ptb1;
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uint32_t h;
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tb_page_addr_t phys_pc, phys_page1;
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/* find translated block using physical mappings */
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phys_pc = get_page_addr_code(env, pc);
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phys_page1 = phys_pc & TARGET_PAGE_MASK;
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h = tb_hash_func(phys_pc, pc, flags, cf_mask);
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/* Start at head of the hash entry */
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ptb1 = tb_hash_head = &tcg_ctx->tb_ctx.tb_phys_hash[h];
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tb = *ptb1;
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while (tb) {
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if (tb->pc == pc &&
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tb->page_addr[0] == phys_page1 &&
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tb->cs_base == cs_base &&
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tb->flags == flags &&
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(tb_cflags(tb) & (CF_HASH_MASK | CF_INVALID)) == cf_mask) {
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if (tb->page_addr[1] == -1) {
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/* done, we have a match */
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break;
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} else {
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/* check next page if needed */
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target_ulong virt_page2 = (pc & TARGET_PAGE_MASK) +
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TARGET_PAGE_SIZE;
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tb_page_addr_t phys_page2 = get_page_addr_code(env, virt_page2);
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if (tb->page_addr[1] == phys_page2) {
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break;
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}
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}
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}
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ptb1 = &tb->phys_hash_next;
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tb = *ptb1;
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}
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if (tb) {
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/* Move the TB to the head of the list */
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*ptb1 = tb->phys_hash_next;
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tb->phys_hash_next = *tb_hash_head;
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*tb_hash_head = tb;
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}
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return tb;
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}
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void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr)
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{
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if (TCG_TARGET_HAS_direct_jump) {
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uintptr_t offset = tb->jmp_target_arg[n];
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uintptr_t tc_ptr = (uintptr_t)tb->tc.ptr;
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tb_target_set_jmp_target(tc_ptr, tc_ptr + offset, addr);
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} else {
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tb->jmp_target_arg[n] = addr;
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}
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}
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static inline void tb_add_jump(TranslationBlock *tb, int n,
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TranslationBlock *tb_next)
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{
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assert(n < ARRAY_SIZE(tb->jmp_list_next));
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if (tb->jmp_list_next[n]) {
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/* Another thread has already done this while we were
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* outside of the lock; nothing to do in this case */
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return;
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}
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qemu_log_mask_and_addr(CPU_LOG_EXEC, tb->pc,
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"Linking TBs %p [" TARGET_FMT_lx
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"] index %d -> %p [" TARGET_FMT_lx "]\n",
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tb->tc.ptr, tb->pc, n,
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tb_next->tc.ptr, tb_next->pc);
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/* patch the native jump address */
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tb_set_jmp_target(tb, n, (uintptr_t)tb_next->tc.ptr);
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/* add in TB jmp circular list */
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tb->jmp_list_next[n] = tb_next->jmp_list_first;
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tb_next->jmp_list_first = (uintptr_t)tb | n;
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}
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static inline TranslationBlock *tb_find(CPUState *cpu,
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TranslationBlock *last_tb,
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int tb_exit, uint32_t cf_mask)
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{
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TranslationBlock *tb;
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target_ulong cs_base, pc;
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uint32_t flags;
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bool acquired_tb_lock = false;
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tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
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if (tb == NULL) {
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mmap_lock();
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//tb_lock();
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acquired_tb_lock = true;
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/* There's a chance that our desired tb has been translated while
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* taking the locks so we check again inside the lock.
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*/
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tb = tb_htable_lookup(cpu, pc, cs_base, flags, cf_mask);
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if (likely(tb == NULL)) {
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/* if no translated code available, then translate it now */
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tb = tb_gen_code(cpu, pc, cs_base, flags, cf_mask);
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}
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mmap_unlock();
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/* We add the TB in the virtual pc hash table for the fast lookup */
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atomic_set(&cpu->tb_jmp_cache[tb_jmp_cache_hash_func(pc)], tb);
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}
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#ifndef CONFIG_USER_ONLY
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/* We don't take care of direct jumps when address mapping changes in
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* system emulation. So it's not safe to make a direct jump to a TB
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* spanning two pages because the mapping for the second page can change.
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*/
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if (tb->page_addr[1] != -1) {
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last_tb = NULL;
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}
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#endif
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/* See if we can patch the calling TB. */
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if (last_tb) {
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if (!acquired_tb_lock) {
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// Unicorn: commented out
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//tb_lock();
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acquired_tb_lock = true;
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}
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/* Check if translation buffer has been flushed */
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if (cpu->tb_flushed) {
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cpu->tb_flushed = false;
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} else if (!(tb_cflags(tb) & CF_INVALID)) {
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tb_add_jump(last_tb, tb_exit, tb);
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}
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}
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if (acquired_tb_lock) {
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// Unicorn: commented out
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//tb_unlock();
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}
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return tb;
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}
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static inline bool cpu_handle_halt(CPUState *cpu)
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{
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if (cpu->halted) {
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if (!cpu_has_work(cpu)) {
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return true;
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}
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cpu->halted = 0;
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}
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return false;
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}
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static inline void cpu_handle_debug_exception(CPUState *cpu)
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{
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CPUClass *cc = CPU_GET_CLASS(cpu->uc, cpu);
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CPUWatchpoint *wp;
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if (!cpu->watchpoint_hit) {
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QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
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wp->flags &= ~BP_WATCHPOINT_HIT;
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}
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}
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cc->debug_excp_handler(cpu);
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}
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static inline bool cpu_handle_exception(struct uc_struct *uc, CPUState *cpu, int *ret)
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{
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struct hook *hook;
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if (cpu->exception_index >= 0) {
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if (cpu->exception_index >= EXCP_INTERRUPT) {
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/* exit request from the cpu execution loop */
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*ret = cpu->exception_index;
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if (*ret == EXCP_DEBUG) {
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cpu_handle_debug_exception(cpu);
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}
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cpu->exception_index = -1;
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return true;
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} else {
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#if defined(CONFIG_USER_ONLY)
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/* if user mode only, we simulate a fake exception
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which will be handled outside the cpu execution
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loop */
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#if defined(TARGET_I386)
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CPUClass *cc = CPU_GET_CLASS(uc, cpu);
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cc->do_interrupt(cpu);
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#endif
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*ret = cpu->exception_index;
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cpu->exception_index = -1;
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return true;
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#else
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bool catched = false;
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if (uc->stop_interrupt && uc->stop_interrupt(cpu->exception_index)) {
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// Unicorn: call registered invalid instruction callbacks
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HOOK_FOREACH_VAR_DECLARE;
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HOOK_FOREACH(uc, hook, UC_HOOK_INSN_INVALID) {
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catched = ((uc_cb_hookinsn_invalid_t)hook->callback)(uc, hook->user_data);
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if (catched) {
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break;
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}
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}
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if (!catched) {
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uc->invalid_error = UC_ERR_INSN_INVALID;
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}
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} else {
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// Unicorn: call registered interrupt callbacks
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HOOK_FOREACH_VAR_DECLARE;
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HOOK_FOREACH(uc, hook, UC_HOOK_INTR) {
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((uc_cb_hookintr_t)hook->callback)(uc, cpu->exception_index, hook->user_data);
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catched = true;
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}
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if (!catched) {
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uc->invalid_error = UC_ERR_EXCEPTION;
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}
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}
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// Unicorn: If un-catched interrupt, stop executions.
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if (!catched) {
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cpu->halted = 1;
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*ret = EXCP_HLT;
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return true;
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}
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cpu->exception_index = -1;
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#endif
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}
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}
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return false;
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}
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static inline bool cpu_handle_interrupt(CPUState *cpu,
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TranslationBlock **last_tb)
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{
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CPUClass *cc = CPU_GET_CLASS(cpu->uc, cpu);
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if (unlikely(atomic_read(&cpu->interrupt_request))) {
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int interrupt_request = cpu->interrupt_request;
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if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
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/* Mask out external interrupts for this step. */
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interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
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}
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if (interrupt_request & CPU_INTERRUPT_DEBUG) {
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cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
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cpu->exception_index = EXCP_DEBUG;
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return true;
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}
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if (interrupt_request & CPU_INTERRUPT_HALT) {
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cpu->interrupt_request &= ~CPU_INTERRUPT_HALT;
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cpu->halted = 1;
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cpu->exception_index = EXCP_HLT;
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return true;
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}
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#if defined(TARGET_I386)
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else if (interrupt_request & CPU_INTERRUPT_INIT) {
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X86CPU *x86_cpu = X86_CPU(cpu->uc, cpu);
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CPUArchState *env = &x86_cpu->env;
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cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, 0, 0);
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do_cpu_init(x86_cpu);
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cpu->exception_index = EXCP_HALTED;
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return true;
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}
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#else
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else if (interrupt_request & CPU_INTERRUPT_RESET) {
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cpu_reset(cpu);
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return true;
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}
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#endif
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/* The target hook has 3 exit conditions:
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False when the interrupt isn't processed,
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True when it is, and we should restart on a new TB,
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and via longjmp via cpu_loop_exit. */
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else {
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if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
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cpu->exception_index = -1;
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*last_tb = NULL;
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}
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/* The target hook may have updated the 'cpu->interrupt_request';
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* reload the 'interrupt_request' value */
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interrupt_request = cpu->interrupt_request;
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}
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if (interrupt_request & CPU_INTERRUPT_EXITTB) {
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cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
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/* ensure that no TB jump will be modified as
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the program flow was changed */
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*last_tb = NULL;
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}
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}
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/* Finally, check if we need to exit to the main loop. */
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if (unlikely(atomic_read(&cpu->exit_request))) {
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atomic_set(&cpu->exit_request, 0);
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if (cpu->exception_index == -1) {
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cpu->exception_index = EXCP_INTERRUPT;
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}
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return true;
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}
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return false;
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}
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static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb,
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TranslationBlock **last_tb, int *tb_exit)
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{
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uintptr_t ret;
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/* execute the generated code */
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ret = cpu_tb_exec(cpu, tb);
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tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK);
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*tb_exit = ret & TB_EXIT_MASK;
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switch (*tb_exit) {
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case TB_EXIT_REQUESTED:
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/* Something asked us to stop executing chained TBs; just
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* continue round the main loop. Whatever requested the exit
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* will also have set something else (eg interrupt_request)
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* which we will handle next time around the loop. But we
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* need to ensure the tcg_exit_req read in generated code
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* comes before the next read of cpu->exit_request or
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* cpu->interrupt_request.
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*/
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smp_mb();
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*last_tb = NULL;
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break;
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case TB_EXIT_ICOUNT_EXPIRED:
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{
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/* Instruction counter expired. */
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#ifdef CONFIG_USER_ONLY
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abort();
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#else
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int insns_left = atomic_read(&cpu_neg(cpu)->icount_decr.u32);
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*last_tb = NULL;
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if (cpu->icount_extra && insns_left >= 0) {
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/* Refill decrementer and continue execution. */
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cpu->icount_extra += insns_left;
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insns_left = MIN(0xffff, cpu->icount_extra);
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cpu->icount_extra -= insns_left;
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cpu_neg(cpu)->icount_decr.u16.low = insns_left;
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} else {
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if (insns_left > 0) {
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/* Execute remaining instructions. */
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cpu_exec_nocache(cpu, insns_left, tb, false);
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// Unicorn: commented out
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//align_clocks(sc, cpu);
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}
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cpu->exception_index = EXCP_INTERRUPT;
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cpu_loop_exit(cpu);
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}
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break;
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#endif
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}
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default:
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*last_tb = tb;
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break;
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}
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}
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void cpu_exec_step_atomic(struct uc_struct *uc, CPUState *cpu)
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{
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CPUArchState *env = (CPUArchState *)cpu->env_ptr;
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TranslationBlock *tb;
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target_ulong cs_base, pc;
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uint32_t flags;
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uint32_t cflags = 1;
|
|
uint32_t cf_mask = cflags & CF_HASH_MASK;
|
|
|
|
cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
|
|
|
|
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
|
|
tb = tb_lookup__cpu_state(cpu, &pc, &cs_base, &flags, cf_mask);
|
|
if (tb == NULL) {
|
|
mmap_lock();
|
|
tb = tb_htable_lookup(cpu, pc, cs_base, flags, cf_mask);
|
|
if (likely(tb == NULL)) {
|
|
tb = tb_gen_code(cpu, pc, cs_base, flags, cflags);
|
|
}
|
|
mmap_unlock();
|
|
}
|
|
|
|
uc->parallel_cpus = false;
|
|
/* execute the generated code */
|
|
cpu_tb_exec(cpu, tb);
|
|
uc->parallel_cpus = true;
|
|
} 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
|
|
// Unicorn: Commented out
|
|
//tcg_debug_assert(!have_mmap_lock());
|
|
#endif
|
|
// Unicorn: commented out
|
|
//tb_lock_reset();
|
|
}
|
|
}
|
|
|
|
/* main execution loop */
|
|
|
|
int cpu_exec(struct uc_struct *uc, CPUState *cpu)
|
|
{
|
|
CPUArchState *env = cpu->env_ptr;
|
|
CPUClass *cc = CPU_GET_CLASS(uc, cpu);
|
|
int ret;
|
|
|
|
if (cpu_handle_halt(cpu)) {
|
|
return EXCP_HALTED;
|
|
}
|
|
|
|
atomic_mb_set(&uc->current_cpu, cpu);
|
|
atomic_mb_set(&uc->tcg_current_rr_cpu, cpu);
|
|
|
|
cc->cpu_exec_enter(cpu);
|
|
cpu->exception_index = -1;
|
|
env->invalid_error = UC_ERR_OK;
|
|
|
|
/* 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 = uc->current_cpu;
|
|
env = cpu->env_ptr;
|
|
cc = CPU_GET_CLASS(uc, cpu);
|
|
#else /* buggy compiler */
|
|
/* Assert that the compiler does not smash local variables. */
|
|
g_assert(cpu == uc->current_cpu);
|
|
g_assert(cc == CPU_GET_CLASS(uc, cpu));
|
|
#endif /* buggy compiler */
|
|
// Unicorn: commented out
|
|
//tb_lock_reset();
|
|
}
|
|
|
|
/* if an exception is pending, we execute it here */
|
|
while (!cpu_handle_exception(uc, cpu, &ret)) {
|
|
TranslationBlock *last_tb = NULL;
|
|
int tb_exit = 0;
|
|
|
|
while (!cpu_handle_interrupt(cpu, &last_tb)) {
|
|
uint32_t cflags = cpu->cflags_next_tb;
|
|
TranslationBlock *tb;
|
|
|
|
/* When requested, use an exact setting for cflags for the next
|
|
execution. This is used for icount, precise smc, and stop-
|
|
after-access watchpoints. Since this request should never
|
|
have CF_INVALID set, -1 is a convenient invalid value that
|
|
does not require tcg headers for cpu_common_reset. */
|
|
if (cflags == -1) {
|
|
cflags = curr_cflags(uc);
|
|
} else {
|
|
cpu->cflags_next_tb = -1;
|
|
}
|
|
|
|
tb = tb_find(cpu, last_tb, tb_exit, cflags);
|
|
if (!tb) { // invalid TB due to invalid code?
|
|
uc->invalid_error = UC_ERR_FETCH_UNMAPPED;
|
|
ret = EXCP_HLT;
|
|
break;
|
|
}
|
|
cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit);
|
|
}
|
|
}
|
|
|
|
cc->cpu_exec_exit(cpu);
|
|
|
|
// Unicorn: flush JIT cache to because emulation might stop in
|
|
// the middle of translation, thus generate incomplete code.
|
|
// TODO: optimize this for better performance
|
|
tb_flush(cpu);
|
|
|
|
return ret;
|
|
}
|