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/*
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* i386 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 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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#include "config.h" |
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#include "cpu.h" |
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#include "disas.h" |
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#include "tcg.h" |
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#include "qemu-barrier.h" |
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|
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int tb_invalidated_flag;
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|
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//#define CONFIG_DEBUG_EXEC
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bool qemu_cpu_has_work(CPUState *env)
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{
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return cpu_has_work(env);
|
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} |
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|
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void cpu_loop_exit(CPUState *env)
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{
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env->current_tb = NULL;
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longjmp(env->jmp_env, 1);
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} |
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|
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/* exit the current TB from a signal handler. The host registers are
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restored in a state compatible with the CPU emulator
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*/
|
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#if defined(CONFIG_SOFTMMU)
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void cpu_resume_from_signal(CPUState *env, void *puc) |
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{
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/* XXX: restore cpu registers saved in host registers */
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|
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env->exception_index = -1;
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longjmp(env->jmp_env, 1);
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} |
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#endif
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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 *env, int max_cycles, |
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TranslationBlock *orig_tb) |
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{
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unsigned long next_tb; |
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TranslationBlock *tb; |
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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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if (max_cycles > CF_COUNT_MASK)
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max_cycles = CF_COUNT_MASK; |
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tb = tb_gen_code(env, orig_tb->pc, orig_tb->cs_base, orig_tb->flags, |
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max_cycles); |
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env->current_tb = tb; |
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/* execute the generated code */
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next_tb = tcg_qemu_tb_exec(env, tb->tc_ptr); |
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env->current_tb = NULL;
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|
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if ((next_tb & 3) == 2) { |
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/* Restore PC. This may happen if async event occurs before
|
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the TB starts executing. */
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cpu_pc_from_tb(env, tb); |
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} |
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tb_phys_invalidate(tb, -1);
|
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tb_free(tb); |
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} |
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|
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static TranslationBlock *tb_find_slow(CPUState *env,
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target_ulong pc, |
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target_ulong cs_base, |
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uint64_t flags) |
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{
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TranslationBlock *tb, **ptb1; |
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unsigned int h; |
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tb_page_addr_t phys_pc, phys_page1, phys_page2; |
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target_ulong virt_page2; |
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tb_invalidated_flag = 0;
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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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phys_page2 = -1;
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h = tb_phys_hash_func(phys_pc); |
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ptb1 = &tb_phys_hash[h]; |
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for(;;) {
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tb = *ptb1; |
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if (!tb)
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goto not_found;
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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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/* check next page if needed */
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if (tb->page_addr[1] != -1) { |
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virt_page2 = (pc & TARGET_PAGE_MASK) + |
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TARGET_PAGE_SIZE; |
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phys_page2 = get_page_addr_code(env, virt_page2); |
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if (tb->page_addr[1] == phys_page2) |
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goto found;
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} else {
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goto found;
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} |
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} |
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ptb1 = &tb->phys_hash_next; |
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} |
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not_found:
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/* if no translated code available, then translate it now */
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tb = tb_gen_code(env, pc, cs_base, flags, 0);
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found:
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/* Move the last found TB to the head of the list */
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if (likely(*ptb1)) {
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*ptb1 = tb->phys_hash_next; |
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tb->phys_hash_next = tb_phys_hash[h]; |
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tb_phys_hash[h] = tb; |
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} |
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/* we add the TB in the virtual pc hash table */
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env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb; |
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return tb;
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} |
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static inline TranslationBlock *tb_find_fast(CPUState *env) |
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{
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TranslationBlock *tb; |
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target_ulong cs_base, pc; |
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int flags;
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/* we record a subset of the CPU state. It will
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always be the same before a given translated block
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is executed. */
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cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags); |
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tb = env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)]; |
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if (unlikely(!tb || tb->pc != pc || tb->cs_base != cs_base ||
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tb->flags != flags)) {
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tb = tb_find_slow(env, pc, cs_base, flags); |
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} |
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return tb;
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} |
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static CPUDebugExcpHandler *debug_excp_handler;
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CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler) |
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{
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CPUDebugExcpHandler *old_handler = debug_excp_handler; |
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debug_excp_handler = handler; |
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return old_handler;
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} |
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static void cpu_handle_debug_exception(CPUState *env) |
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{
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CPUWatchpoint *wp; |
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|
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if (!env->watchpoint_hit) {
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QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
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wp->flags &= ~BP_WATCHPOINT_HIT; |
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} |
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} |
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if (debug_excp_handler) {
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debug_excp_handler(env); |
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} |
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} |
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/* main execution loop */
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|
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volatile sig_atomic_t exit_request;
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int cpu_exec(CPUState *env)
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{
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int ret, interrupt_request;
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TranslationBlock *tb; |
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uint8_t *tc_ptr; |
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unsigned long next_tb; |
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if (env->halted) {
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if (!cpu_has_work(env)) {
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return EXCP_HALTED;
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} |
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env->halted = 0;
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} |
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cpu_single_env = env; |
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|
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if (unlikely(exit_request)) {
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env->exit_request = 1;
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} |
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#if defined(TARGET_I386)
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/* put eflags in CPU temporary format */
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CC_SRC = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); |
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DF = 1 - (2 * ((env->eflags >> 10) & 1)); |
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CC_OP = CC_OP_EFLAGS; |
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env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); |
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#elif defined(TARGET_SPARC)
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#elif defined(TARGET_M68K)
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env->cc_op = CC_OP_FLAGS; |
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env->cc_dest = env->sr & 0xf;
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env->cc_x = (env->sr >> 4) & 1; |
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#elif defined(TARGET_ALPHA)
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#elif defined(TARGET_ARM)
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#elif defined(TARGET_UNICORE32)
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#elif defined(TARGET_PPC)
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#elif defined(TARGET_LM32)
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#elif defined(TARGET_MICROBLAZE)
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#elif defined(TARGET_MIPS)
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#elif defined(TARGET_SH4)
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#elif defined(TARGET_CRIS)
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#elif defined(TARGET_S390X)
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/* XXXXX */
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#else
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#error unsupported target CPU
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#endif
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env->exception_index = -1;
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|
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/* prepare setjmp context for exception handling */
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for(;;) {
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if (setjmp(env->jmp_env) == 0) { |
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/* if an exception is pending, we execute it here */
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if (env->exception_index >= 0) { |
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if (env->exception_index >= EXCP_INTERRUPT) {
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/* exit request from the cpu execution loop */
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ret = env->exception_index; |
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if (ret == EXCP_DEBUG) {
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cpu_handle_debug_exception(env); |
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} |
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break;
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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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do_interrupt(env); |
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#endif
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ret = env->exception_index; |
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break;
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#else
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do_interrupt(env); |
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env->exception_index = -1;
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#endif
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} |
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} |
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|
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next_tb = 0; /* force lookup of first TB */ |
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for(;;) {
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interrupt_request = env->interrupt_request; |
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if (unlikely(interrupt_request)) {
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if (unlikely(env->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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env->interrupt_request &= ~CPU_INTERRUPT_DEBUG; |
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env->exception_index = EXCP_DEBUG; |
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cpu_loop_exit(env); |
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} |
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#if defined(TARGET_ARM) || defined(TARGET_SPARC) || defined(TARGET_MIPS) || \
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defined(TARGET_PPC) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) || \ |
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defined(TARGET_MICROBLAZE) || defined(TARGET_LM32) || defined(TARGET_UNICORE32) |
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if (interrupt_request & CPU_INTERRUPT_HALT) {
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env->interrupt_request &= ~CPU_INTERRUPT_HALT; |
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env->halted = 1;
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env->exception_index = EXCP_HLT; |
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cpu_loop_exit(env); |
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} |
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#endif
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#if defined(TARGET_I386)
|
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if (interrupt_request & CPU_INTERRUPT_INIT) {
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svm_check_intercept(env, SVM_EXIT_INIT); |
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do_cpu_init(env); |
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env->exception_index = EXCP_HALTED; |
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cpu_loop_exit(env); |
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} else if (interrupt_request & CPU_INTERRUPT_SIPI) { |
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do_cpu_sipi(env); |
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} else if (env->hflags2 & HF2_GIF_MASK) { |
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if ((interrupt_request & CPU_INTERRUPT_SMI) &&
|
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!(env->hflags & HF_SMM_MASK)) {
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svm_check_intercept(env, SVM_EXIT_SMI); |
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env->interrupt_request &= ~CPU_INTERRUPT_SMI; |
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do_smm_enter(env); |
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next_tb = 0;
|
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} else if ((interrupt_request & CPU_INTERRUPT_NMI) && |
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!(env->hflags2 & HF2_NMI_MASK)) {
|
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env->interrupt_request &= ~CPU_INTERRUPT_NMI; |
| 301 |
env->hflags2 |= HF2_NMI_MASK; |
| 302 |
do_interrupt_x86_hardirq(env, EXCP02_NMI, 1);
|
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next_tb = 0;
|
| 304 |
} else if (interrupt_request & CPU_INTERRUPT_MCE) { |
| 305 |
env->interrupt_request &= ~CPU_INTERRUPT_MCE; |
| 306 |
do_interrupt_x86_hardirq(env, EXCP12_MCHK, 0);
|
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next_tb = 0;
|
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} else if ((interrupt_request & CPU_INTERRUPT_HARD) && |
| 309 |
(((env->hflags2 & HF2_VINTR_MASK) && |
| 310 |
(env->hflags2 & HF2_HIF_MASK)) || |
| 311 |
(!(env->hflags2 & HF2_VINTR_MASK) && |
| 312 |
(env->eflags & IF_MASK && |
| 313 |
!(env->hflags & HF_INHIBIT_IRQ_MASK))))) {
|
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int intno;
|
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svm_check_intercept(env, SVM_EXIT_INTR); |
| 316 |
env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ); |
| 317 |
intno = cpu_get_pic_interrupt(env); |
| 318 |
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
|
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do_interrupt_x86_hardirq(env, intno, 1);
|
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/* ensure that no TB jump will be modified as
|
| 321 |
the program flow was changed */
|
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next_tb = 0;
|
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#if !defined(CONFIG_USER_ONLY)
|
| 324 |
} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) && |
| 325 |
(env->eflags & IF_MASK) && |
| 326 |
!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
|
| 327 |
int intno;
|
| 328 |
/* FIXME: this should respect TPR */
|
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svm_check_intercept(env, SVM_EXIT_VINTR); |
| 330 |
intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
|
| 331 |
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
|
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do_interrupt_x86_hardirq(env, intno, 1);
|
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env->interrupt_request &= ~CPU_INTERRUPT_VIRQ; |
| 334 |
next_tb = 0;
|
| 335 |
#endif
|
| 336 |
} |
| 337 |
} |
| 338 |
#elif defined(TARGET_PPC)
|
| 339 |
#if 0
|
| 340 |
if ((interrupt_request & CPU_INTERRUPT_RESET)) {
|
| 341 |
cpu_reset(env);
|
| 342 |
}
|
| 343 |
#endif
|
| 344 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
| 345 |
ppc_hw_interrupt(env); |
| 346 |
if (env->pending_interrupts == 0) |
| 347 |
env->interrupt_request &= ~CPU_INTERRUPT_HARD; |
| 348 |
next_tb = 0;
|
| 349 |
} |
| 350 |
#elif defined(TARGET_LM32)
|
| 351 |
if ((interrupt_request & CPU_INTERRUPT_HARD)
|
| 352 |
&& (env->ie & IE_IE)) {
|
| 353 |
env->exception_index = EXCP_IRQ; |
| 354 |
do_interrupt(env); |
| 355 |
next_tb = 0;
|
| 356 |
} |
| 357 |
#elif defined(TARGET_MICROBLAZE)
|
| 358 |
if ((interrupt_request & CPU_INTERRUPT_HARD)
|
| 359 |
&& (env->sregs[SR_MSR] & MSR_IE) |
| 360 |
&& !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)) |
| 361 |
&& !(env->iflags & (D_FLAG | IMM_FLAG))) {
|
| 362 |
env->exception_index = EXCP_IRQ; |
| 363 |
do_interrupt(env); |
| 364 |
next_tb = 0;
|
| 365 |
} |
| 366 |
#elif defined(TARGET_MIPS)
|
| 367 |
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
|
| 368 |
cpu_mips_hw_interrupts_pending(env)) {
|
| 369 |
/* Raise it */
|
| 370 |
env->exception_index = EXCP_EXT_INTERRUPT; |
| 371 |
env->error_code = 0;
|
| 372 |
do_interrupt(env); |
| 373 |
next_tb = 0;
|
| 374 |
} |
| 375 |
#elif defined(TARGET_SPARC)
|
| 376 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
| 377 |
if (cpu_interrupts_enabled(env) &&
|
| 378 |
env->interrupt_index > 0) {
|
| 379 |
int pil = env->interrupt_index & 0xf; |
| 380 |
int type = env->interrupt_index & 0xf0; |
| 381 |
|
| 382 |
if (((type == TT_EXTINT) &&
|
| 383 |
cpu_pil_allowed(env, pil)) || |
| 384 |
type != TT_EXTINT) {
|
| 385 |
env->exception_index = env->interrupt_index; |
| 386 |
do_interrupt(env); |
| 387 |
next_tb = 0;
|
| 388 |
} |
| 389 |
} |
| 390 |
} |
| 391 |
#elif defined(TARGET_ARM)
|
| 392 |
if (interrupt_request & CPU_INTERRUPT_FIQ
|
| 393 |
&& !(env->uncached_cpsr & CPSR_F)) {
|
| 394 |
env->exception_index = EXCP_FIQ; |
| 395 |
do_interrupt(env); |
| 396 |
next_tb = 0;
|
| 397 |
} |
| 398 |
/* ARMv7-M interrupt return works by loading a magic value
|
| 399 |
into the PC. On real hardware the load causes the
|
| 400 |
return to occur. The qemu implementation performs the
|
| 401 |
jump normally, then does the exception return when the
|
| 402 |
CPU tries to execute code at the magic address.
|
| 403 |
This will cause the magic PC value to be pushed to
|
| 404 |
the stack if an interrupt occurred at the wrong time.
|
| 405 |
We avoid this by disabling interrupts when
|
| 406 |
pc contains a magic address. */
|
| 407 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
| 408 |
&& ((IS_M(env) && env->regs[15] < 0xfffffff0) |
| 409 |
|| !(env->uncached_cpsr & CPSR_I))) {
|
| 410 |
env->exception_index = EXCP_IRQ; |
| 411 |
do_interrupt(env); |
| 412 |
next_tb = 0;
|
| 413 |
} |
| 414 |
#elif defined(TARGET_UNICORE32)
|
| 415 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
| 416 |
&& !(env->uncached_asr & ASR_I)) {
|
| 417 |
do_interrupt(env); |
| 418 |
next_tb = 0;
|
| 419 |
} |
| 420 |
#elif defined(TARGET_SH4)
|
| 421 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
| 422 |
do_interrupt(env); |
| 423 |
next_tb = 0;
|
| 424 |
} |
| 425 |
#elif defined(TARGET_ALPHA)
|
| 426 |
{
|
| 427 |
int idx = -1; |
| 428 |
/* ??? This hard-codes the OSF/1 interrupt levels. */
|
| 429 |
switch (env->pal_mode ? 7 : env->ps & PS_INT_MASK) { |
| 430 |
case 0 ... 3: |
| 431 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
| 432 |
idx = EXCP_DEV_INTERRUPT; |
| 433 |
} |
| 434 |
/* FALLTHRU */
|
| 435 |
case 4: |
| 436 |
if (interrupt_request & CPU_INTERRUPT_TIMER) {
|
| 437 |
idx = EXCP_CLK_INTERRUPT; |
| 438 |
} |
| 439 |
/* FALLTHRU */
|
| 440 |
case 5: |
| 441 |
if (interrupt_request & CPU_INTERRUPT_SMP) {
|
| 442 |
idx = EXCP_SMP_INTERRUPT; |
| 443 |
} |
| 444 |
/* FALLTHRU */
|
| 445 |
case 6: |
| 446 |
if (interrupt_request & CPU_INTERRUPT_MCHK) {
|
| 447 |
idx = EXCP_MCHK; |
| 448 |
} |
| 449 |
} |
| 450 |
if (idx >= 0) { |
| 451 |
env->exception_index = idx; |
| 452 |
env->error_code = 0;
|
| 453 |
do_interrupt(env); |
| 454 |
next_tb = 0;
|
| 455 |
} |
| 456 |
} |
| 457 |
#elif defined(TARGET_CRIS)
|
| 458 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
| 459 |
&& (env->pregs[PR_CCS] & I_FLAG) |
| 460 |
&& !env->locked_irq) {
|
| 461 |
env->exception_index = EXCP_IRQ; |
| 462 |
do_interrupt(env); |
| 463 |
next_tb = 0;
|
| 464 |
} |
| 465 |
if (interrupt_request & CPU_INTERRUPT_NMI
|
| 466 |
&& (env->pregs[PR_CCS] & M_FLAG)) {
|
| 467 |
env->exception_index = EXCP_NMI; |
| 468 |
do_interrupt(env); |
| 469 |
next_tb = 0;
|
| 470 |
} |
| 471 |
#elif defined(TARGET_M68K)
|
| 472 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
| 473 |
&& ((env->sr & SR_I) >> SR_I_SHIFT) |
| 474 |
< env->pending_level) {
|
| 475 |
/* Real hardware gets the interrupt vector via an
|
| 476 |
IACK cycle at this point. Current emulated
|
| 477 |
hardware doesn't rely on this, so we
|
| 478 |
provide/save the vector when the interrupt is
|
| 479 |
first signalled. */
|
| 480 |
env->exception_index = env->pending_vector; |
| 481 |
do_interrupt_m68k_hardirq(env); |
| 482 |
next_tb = 0;
|
| 483 |
} |
| 484 |
#elif defined(TARGET_S390X) && !defined(CONFIG_USER_ONLY)
|
| 485 |
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
|
| 486 |
(env->psw.mask & PSW_MASK_EXT)) {
|
| 487 |
do_interrupt(env); |
| 488 |
next_tb = 0;
|
| 489 |
} |
| 490 |
#endif
|
| 491 |
/* Don't use the cached interrupt_request value,
|
| 492 |
do_interrupt may have updated the EXITTB flag. */
|
| 493 |
if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
|
| 494 |
env->interrupt_request &= ~CPU_INTERRUPT_EXITTB; |
| 495 |
/* ensure that no TB jump will be modified as
|
| 496 |
the program flow was changed */
|
| 497 |
next_tb = 0;
|
| 498 |
} |
| 499 |
} |
| 500 |
if (unlikely(env->exit_request)) {
|
| 501 |
env->exit_request = 0;
|
| 502 |
env->exception_index = EXCP_INTERRUPT; |
| 503 |
cpu_loop_exit(env); |
| 504 |
} |
| 505 |
#if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
|
| 506 |
if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
|
| 507 |
/* restore flags in standard format */
|
| 508 |
#if defined(TARGET_I386)
|
| 509 |
env->eflags = env->eflags | cpu_cc_compute_all(env, CC_OP) |
| 510 |
| (DF & DF_MASK); |
| 511 |
log_cpu_state(env, X86_DUMP_CCOP); |
| 512 |
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); |
| 513 |
#elif defined(TARGET_M68K)
|
| 514 |
cpu_m68k_flush_flags(env, env->cc_op); |
| 515 |
env->cc_op = CC_OP_FLAGS; |
| 516 |
env->sr = (env->sr & 0xffe0)
|
| 517 |
| env->cc_dest | (env->cc_x << 4);
|
| 518 |
log_cpu_state(env, 0);
|
| 519 |
#else
|
| 520 |
log_cpu_state(env, 0);
|
| 521 |
#endif
|
| 522 |
} |
| 523 |
#endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */ |
| 524 |
spin_lock(&tb_lock); |
| 525 |
tb = tb_find_fast(env); |
| 526 |
/* Note: we do it here to avoid a gcc bug on Mac OS X when
|
| 527 |
doing it in tb_find_slow */
|
| 528 |
if (tb_invalidated_flag) {
|
| 529 |
/* as some TB could have been invalidated because
|
| 530 |
of memory exceptions while generating the code, we
|
| 531 |
must recompute the hash index here */
|
| 532 |
next_tb = 0;
|
| 533 |
tb_invalidated_flag = 0;
|
| 534 |
} |
| 535 |
#ifdef CONFIG_DEBUG_EXEC
|
| 536 |
qemu_log_mask(CPU_LOG_EXEC, "Trace 0x%08lx [" TARGET_FMT_lx "] %s\n", |
| 537 |
(long)tb->tc_ptr, tb->pc,
|
| 538 |
lookup_symbol(tb->pc)); |
| 539 |
#endif
|
| 540 |
/* see if we can patch the calling TB. When the TB
|
| 541 |
spans two pages, we cannot safely do a direct
|
| 542 |
jump. */
|
| 543 |
if (next_tb != 0 && tb->page_addr[1] == -1) { |
| 544 |
tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb); |
| 545 |
} |
| 546 |
spin_unlock(&tb_lock); |
| 547 |
|
| 548 |
/* cpu_interrupt might be called while translating the
|
| 549 |
TB, but before it is linked into a potentially
|
| 550 |
infinite loop and becomes env->current_tb. Avoid
|
| 551 |
starting execution if there is a pending interrupt. */
|
| 552 |
env->current_tb = tb; |
| 553 |
barrier(); |
| 554 |
if (likely(!env->exit_request)) {
|
| 555 |
tc_ptr = tb->tc_ptr; |
| 556 |
/* execute the generated code */
|
| 557 |
next_tb = tcg_qemu_tb_exec(env, tc_ptr); |
| 558 |
if ((next_tb & 3) == 2) { |
| 559 |
/* Instruction counter expired. */
|
| 560 |
int insns_left;
|
| 561 |
tb = (TranslationBlock *)(long)(next_tb & ~3); |
| 562 |
/* Restore PC. */
|
| 563 |
cpu_pc_from_tb(env, tb); |
| 564 |
insns_left = env->icount_decr.u32; |
| 565 |
if (env->icount_extra && insns_left >= 0) { |
| 566 |
/* Refill decrementer and continue execution. */
|
| 567 |
env->icount_extra += insns_left; |
| 568 |
if (env->icount_extra > 0xffff) { |
| 569 |
insns_left = 0xffff;
|
| 570 |
} else {
|
| 571 |
insns_left = env->icount_extra; |
| 572 |
} |
| 573 |
env->icount_extra -= insns_left; |
| 574 |
env->icount_decr.u16.low = insns_left; |
| 575 |
} else {
|
| 576 |
if (insns_left > 0) { |
| 577 |
/* Execute remaining instructions. */
|
| 578 |
cpu_exec_nocache(env, insns_left, tb); |
| 579 |
} |
| 580 |
env->exception_index = EXCP_INTERRUPT; |
| 581 |
next_tb = 0;
|
| 582 |
cpu_loop_exit(env); |
| 583 |
} |
| 584 |
} |
| 585 |
} |
| 586 |
env->current_tb = NULL;
|
| 587 |
/* reset soft MMU for next block (it can currently
|
| 588 |
only be set by a memory fault) */
|
| 589 |
} /* for(;;) */
|
| 590 |
} else {
|
| 591 |
/* Reload env after longjmp - the compiler may have smashed all
|
| 592 |
* local variables as longjmp is marked 'noreturn'. */
|
| 593 |
env = cpu_single_env; |
| 594 |
} |
| 595 |
} /* for(;;) */
|
| 596 |
|
| 597 |
|
| 598 |
#if defined(TARGET_I386)
|
| 599 |
/* restore flags in standard format */
|
| 600 |
env->eflags = env->eflags | cpu_cc_compute_all(env, CC_OP) |
| 601 |
| (DF & DF_MASK); |
| 602 |
#elif defined(TARGET_ARM)
|
| 603 |
/* XXX: Save/restore host fpu exception state?. */
|
| 604 |
#elif defined(TARGET_UNICORE32)
|
| 605 |
#elif defined(TARGET_SPARC)
|
| 606 |
#elif defined(TARGET_PPC)
|
| 607 |
#elif defined(TARGET_LM32)
|
| 608 |
#elif defined(TARGET_M68K)
|
| 609 |
cpu_m68k_flush_flags(env, env->cc_op); |
| 610 |
env->cc_op = CC_OP_FLAGS; |
| 611 |
env->sr = (env->sr & 0xffe0)
|
| 612 |
| env->cc_dest | (env->cc_x << 4);
|
| 613 |
#elif defined(TARGET_MICROBLAZE)
|
| 614 |
#elif defined(TARGET_MIPS)
|
| 615 |
#elif defined(TARGET_SH4)
|
| 616 |
#elif defined(TARGET_ALPHA)
|
| 617 |
#elif defined(TARGET_CRIS)
|
| 618 |
#elif defined(TARGET_S390X)
|
| 619 |
/* XXXXX */
|
| 620 |
#else
|
| 621 |
#error unsupported target CPU
|
| 622 |
#endif
|
| 623 |
|
| 624 |
/* fail safe : never use cpu_single_env outside cpu_exec() */
|
| 625 |
cpu_single_env = NULL;
|
| 626 |
return ret;
|
| 627 |
} |