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/*
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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 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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#include "qtest.h" |
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int tb_invalidated_flag;
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//#define CONFIG_DEBUG_EXEC
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bool qemu_cpu_has_work(CPUArchState *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(CPUArchState *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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/* 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(CPUArchState *env, void *puc) |
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{ |
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/* XXX: restore cpu registers saved in host registers */
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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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|
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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(CPUArchState *env, int max_cycles, |
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TranslationBlock *orig_tb) |
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{ |
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tcg_target_ulong next_tb; |
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TranslationBlock *tb; |
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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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static TranslationBlock *tb_find_slow(CPUArchState *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; |
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target_ulong virt_page2; |
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tb_invalidated_flag = 0;
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|
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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_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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tb_page_addr_t phys_page2; |
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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(CPUArchState *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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void cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler)
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{ |
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debug_excp_handler = handler; |
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} |
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static void cpu_handle_debug_exception(CPUArchState *env) |
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{ |
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CPUWatchpoint *wp; |
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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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volatile sig_atomic_t exit_request;
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int cpu_exec(CPUArchState *env)
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{ |
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#ifdef TARGET_PPC
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CPUState *cpu = ENV_GET_CPU(env); |
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#endif
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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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tcg_target_ulong 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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} |
196 |
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env->halted = 0;
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} |
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cpu_single_env = env; |
201 |
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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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env->reserve_addr = -1;
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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_OPENRISC)
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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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#elif defined(TARGET_XTENSA)
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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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/* 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) { |
241 |
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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} |
264 |
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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; |
268 |
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; |
272 |
} |
273 |
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
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env->interrupt_request &= ~CPU_INTERRUPT_DEBUG; |
275 |
env->exception_index = EXCP_DEBUG; |
276 |
cpu_loop_exit(env); |
277 |
} |
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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) || \ |
280 |
defined(TARGET_MICROBLAZE) || defined(TARGET_LM32) || defined(TARGET_UNICORE32) |
281 |
if (interrupt_request & CPU_INTERRUPT_HALT) {
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env->interrupt_request &= ~CPU_INTERRUPT_HALT; |
283 |
env->halted = 1;
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env->exception_index = EXCP_HLT; |
285 |
cpu_loop_exit(env); |
286 |
} |
287 |
#endif
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#if defined(TARGET_I386)
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#if !defined(CONFIG_USER_ONLY)
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if (interrupt_request & CPU_INTERRUPT_POLL) {
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env->interrupt_request &= ~CPU_INTERRUPT_POLL; |
292 |
apic_poll_irq(env->apic_state); |
293 |
} |
294 |
#endif
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295 |
if (interrupt_request & CPU_INTERRUPT_INIT) {
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cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, |
297 |
0);
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do_cpu_init(x86_env_get_cpu(env)); |
299 |
env->exception_index = EXCP_HALTED; |
300 |
cpu_loop_exit(env); |
301 |
} else if (interrupt_request & CPU_INTERRUPT_SIPI) { |
302 |
do_cpu_sipi(x86_env_get_cpu(env)); |
303 |
} else if (env->hflags2 & HF2_GIF_MASK) { |
304 |
if ((interrupt_request & CPU_INTERRUPT_SMI) &&
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!(env->hflags & HF_SMM_MASK)) { |
306 |
cpu_svm_check_intercept_param(env, SVM_EXIT_SMI, |
307 |
0);
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env->interrupt_request &= ~CPU_INTERRUPT_SMI; |
309 |
do_smm_enter(env); |
310 |
next_tb = 0;
|
311 |
} else if ((interrupt_request & CPU_INTERRUPT_NMI) && |
312 |
!(env->hflags2 & HF2_NMI_MASK)) { |
313 |
env->interrupt_request &= ~CPU_INTERRUPT_NMI; |
314 |
env->hflags2 |= HF2_NMI_MASK; |
315 |
do_interrupt_x86_hardirq(env, EXCP02_NMI, 1);
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316 |
next_tb = 0;
|
317 |
} else if (interrupt_request & CPU_INTERRUPT_MCE) { |
318 |
env->interrupt_request &= ~CPU_INTERRUPT_MCE; |
319 |
do_interrupt_x86_hardirq(env, EXCP12_MCHK, 0);
|
320 |
next_tb = 0;
|
321 |
} else if ((interrupt_request & CPU_INTERRUPT_HARD) && |
322 |
(((env->hflags2 & HF2_VINTR_MASK) && |
323 |
(env->hflags2 & HF2_HIF_MASK)) || |
324 |
(!(env->hflags2 & HF2_VINTR_MASK) && |
325 |
(env->eflags & IF_MASK && |
326 |
!(env->hflags & HF_INHIBIT_IRQ_MASK))))) { |
327 |
int intno;
|
328 |
cpu_svm_check_intercept_param(env, SVM_EXIT_INTR, |
329 |
0);
|
330 |
env->interrupt_request &= ~(CPU_INTERRUPT_HARD | CPU_INTERRUPT_VIRQ); |
331 |
intno = cpu_get_pic_interrupt(env); |
332 |
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing hardware INT=0x%02x\n", intno);
|
333 |
do_interrupt_x86_hardirq(env, intno, 1);
|
334 |
/* ensure that no TB jump will be modified as
|
335 |
the program flow was changed */
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336 |
next_tb = 0;
|
337 |
#if !defined(CONFIG_USER_ONLY)
|
338 |
} else if ((interrupt_request & CPU_INTERRUPT_VIRQ) && |
339 |
(env->eflags & IF_MASK) && |
340 |
!(env->hflags & HF_INHIBIT_IRQ_MASK)) { |
341 |
int intno;
|
342 |
/* FIXME: this should respect TPR */
|
343 |
cpu_svm_check_intercept_param(env, SVM_EXIT_VINTR, |
344 |
0);
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345 |
intno = ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_vector));
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346 |
qemu_log_mask(CPU_LOG_TB_IN_ASM, "Servicing virtual hardware INT=0x%02x\n", intno);
|
347 |
do_interrupt_x86_hardirq(env, intno, 1);
|
348 |
env->interrupt_request &= ~CPU_INTERRUPT_VIRQ; |
349 |
next_tb = 0;
|
350 |
#endif
|
351 |
} |
352 |
} |
353 |
#elif defined(TARGET_PPC)
|
354 |
if ((interrupt_request & CPU_INTERRUPT_RESET)) {
|
355 |
cpu_reset(cpu); |
356 |
} |
357 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
358 |
ppc_hw_interrupt(env); |
359 |
if (env->pending_interrupts == 0) |
360 |
env->interrupt_request &= ~CPU_INTERRUPT_HARD; |
361 |
next_tb = 0;
|
362 |
} |
363 |
#elif defined(TARGET_LM32)
|
364 |
if ((interrupt_request & CPU_INTERRUPT_HARD)
|
365 |
&& (env->ie & IE_IE)) { |
366 |
env->exception_index = EXCP_IRQ; |
367 |
do_interrupt(env); |
368 |
next_tb = 0;
|
369 |
} |
370 |
#elif defined(TARGET_MICROBLAZE)
|
371 |
if ((interrupt_request & CPU_INTERRUPT_HARD)
|
372 |
&& (env->sregs[SR_MSR] & MSR_IE) |
373 |
&& !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)) |
374 |
&& !(env->iflags & (D_FLAG | IMM_FLAG))) { |
375 |
env->exception_index = EXCP_IRQ; |
376 |
do_interrupt(env); |
377 |
next_tb = 0;
|
378 |
} |
379 |
#elif defined(TARGET_MIPS)
|
380 |
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
|
381 |
cpu_mips_hw_interrupts_pending(env)) { |
382 |
/* Raise it */
|
383 |
env->exception_index = EXCP_EXT_INTERRUPT; |
384 |
env->error_code = 0;
|
385 |
do_interrupt(env); |
386 |
next_tb = 0;
|
387 |
} |
388 |
#elif defined(TARGET_OPENRISC)
|
389 |
{ |
390 |
int idx = -1; |
391 |
if ((interrupt_request & CPU_INTERRUPT_HARD)
|
392 |
&& (env->sr & SR_IEE)) { |
393 |
idx = EXCP_INT; |
394 |
} |
395 |
if ((interrupt_request & CPU_INTERRUPT_TIMER)
|
396 |
&& (env->sr & SR_TEE)) { |
397 |
idx = EXCP_TICK; |
398 |
} |
399 |
if (idx >= 0) { |
400 |
env->exception_index = idx; |
401 |
do_interrupt(env); |
402 |
next_tb = 0;
|
403 |
} |
404 |
} |
405 |
#elif defined(TARGET_SPARC)
|
406 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
407 |
if (cpu_interrupts_enabled(env) &&
|
408 |
env->interrupt_index > 0) {
|
409 |
int pil = env->interrupt_index & 0xf; |
410 |
int type = env->interrupt_index & 0xf0; |
411 |
|
412 |
if (((type == TT_EXTINT) &&
|
413 |
cpu_pil_allowed(env, pil)) || |
414 |
type != TT_EXTINT) { |
415 |
env->exception_index = env->interrupt_index; |
416 |
do_interrupt(env); |
417 |
next_tb = 0;
|
418 |
} |
419 |
} |
420 |
} |
421 |
#elif defined(TARGET_ARM)
|
422 |
if (interrupt_request & CPU_INTERRUPT_FIQ
|
423 |
&& !(env->uncached_cpsr & CPSR_F)) { |
424 |
env->exception_index = EXCP_FIQ; |
425 |
do_interrupt(env); |
426 |
next_tb = 0;
|
427 |
} |
428 |
/* ARMv7-M interrupt return works by loading a magic value
|
429 |
into the PC. On real hardware the load causes the
|
430 |
return to occur. The qemu implementation performs the
|
431 |
jump normally, then does the exception return when the
|
432 |
CPU tries to execute code at the magic address.
|
433 |
This will cause the magic PC value to be pushed to
|
434 |
the stack if an interrupt occurred at the wrong time.
|
435 |
We avoid this by disabling interrupts when
|
436 |
pc contains a magic address. */
|
437 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
438 |
&& ((IS_M(env) && env->regs[15] < 0xfffffff0) |
439 |
|| !(env->uncached_cpsr & CPSR_I))) { |
440 |
env->exception_index = EXCP_IRQ; |
441 |
do_interrupt(env); |
442 |
next_tb = 0;
|
443 |
} |
444 |
#elif defined(TARGET_UNICORE32)
|
445 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
446 |
&& !(env->uncached_asr & ASR_I)) { |
447 |
env->exception_index = UC32_EXCP_INTR; |
448 |
do_interrupt(env); |
449 |
next_tb = 0;
|
450 |
} |
451 |
#elif defined(TARGET_SH4)
|
452 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
453 |
do_interrupt(env); |
454 |
next_tb = 0;
|
455 |
} |
456 |
#elif defined(TARGET_ALPHA)
|
457 |
{ |
458 |
int idx = -1; |
459 |
/* ??? This hard-codes the OSF/1 interrupt levels. */
|
460 |
switch (env->pal_mode ? 7 : env->ps & PS_INT_MASK) { |
461 |
case 0 ... 3: |
462 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
463 |
idx = EXCP_DEV_INTERRUPT; |
464 |
} |
465 |
/* FALLTHRU */
|
466 |
case 4: |
467 |
if (interrupt_request & CPU_INTERRUPT_TIMER) {
|
468 |
idx = EXCP_CLK_INTERRUPT; |
469 |
} |
470 |
/* FALLTHRU */
|
471 |
case 5: |
472 |
if (interrupt_request & CPU_INTERRUPT_SMP) {
|
473 |
idx = EXCP_SMP_INTERRUPT; |
474 |
} |
475 |
/* FALLTHRU */
|
476 |
case 6: |
477 |
if (interrupt_request & CPU_INTERRUPT_MCHK) {
|
478 |
idx = EXCP_MCHK; |
479 |
} |
480 |
} |
481 |
if (idx >= 0) { |
482 |
env->exception_index = idx; |
483 |
env->error_code = 0;
|
484 |
do_interrupt(env); |
485 |
next_tb = 0;
|
486 |
} |
487 |
} |
488 |
#elif defined(TARGET_CRIS)
|
489 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
490 |
&& (env->pregs[PR_CCS] & I_FLAG) |
491 |
&& !env->locked_irq) { |
492 |
env->exception_index = EXCP_IRQ; |
493 |
do_interrupt(env); |
494 |
next_tb = 0;
|
495 |
} |
496 |
if (interrupt_request & CPU_INTERRUPT_NMI) {
|
497 |
unsigned int m_flag_archval; |
498 |
if (env->pregs[PR_VR] < 32) { |
499 |
m_flag_archval = M_FLAG_V10; |
500 |
} else {
|
501 |
m_flag_archval = M_FLAG_V32; |
502 |
} |
503 |
if ((env->pregs[PR_CCS] & m_flag_archval)) {
|
504 |
env->exception_index = EXCP_NMI; |
505 |
do_interrupt(env); |
506 |
next_tb = 0;
|
507 |
} |
508 |
} |
509 |
#elif defined(TARGET_M68K)
|
510 |
if (interrupt_request & CPU_INTERRUPT_HARD
|
511 |
&& ((env->sr & SR_I) >> SR_I_SHIFT) |
512 |
< env->pending_level) { |
513 |
/* Real hardware gets the interrupt vector via an
|
514 |
IACK cycle at this point. Current emulated
|
515 |
hardware doesn't rely on this, so we
|
516 |
provide/save the vector when the interrupt is
|
517 |
first signalled. */
|
518 |
env->exception_index = env->pending_vector; |
519 |
do_interrupt_m68k_hardirq(env); |
520 |
next_tb = 0;
|
521 |
} |
522 |
#elif defined(TARGET_S390X) && !defined(CONFIG_USER_ONLY)
|
523 |
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
|
524 |
(env->psw.mask & PSW_MASK_EXT)) { |
525 |
do_interrupt(env); |
526 |
next_tb = 0;
|
527 |
} |
528 |
#elif defined(TARGET_XTENSA)
|
529 |
if (interrupt_request & CPU_INTERRUPT_HARD) {
|
530 |
env->exception_index = EXC_IRQ; |
531 |
do_interrupt(env); |
532 |
next_tb = 0;
|
533 |
} |
534 |
#endif
|
535 |
/* Don't use the cached interrupt_request value,
|
536 |
do_interrupt may have updated the EXITTB flag. */
|
537 |
if (env->interrupt_request & CPU_INTERRUPT_EXITTB) {
|
538 |
env->interrupt_request &= ~CPU_INTERRUPT_EXITTB; |
539 |
/* ensure that no TB jump will be modified as
|
540 |
the program flow was changed */
|
541 |
next_tb = 0;
|
542 |
} |
543 |
} |
544 |
if (unlikely(env->exit_request)) {
|
545 |
env->exit_request = 0;
|
546 |
env->exception_index = EXCP_INTERRUPT; |
547 |
cpu_loop_exit(env); |
548 |
} |
549 |
#if defined(DEBUG_DISAS) || defined(CONFIG_DEBUG_EXEC)
|
550 |
if (qemu_loglevel_mask(CPU_LOG_TB_CPU)) {
|
551 |
/* restore flags in standard format */
|
552 |
#if defined(TARGET_I386)
|
553 |
env->eflags = env->eflags | cpu_cc_compute_all(env, CC_OP) |
554 |
| (DF & DF_MASK); |
555 |
log_cpu_state(env, X86_DUMP_CCOP); |
556 |
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C); |
557 |
#elif defined(TARGET_M68K)
|
558 |
cpu_m68k_flush_flags(env, env->cc_op); |
559 |
env->cc_op = CC_OP_FLAGS; |
560 |
env->sr = (env->sr & 0xffe0)
|
561 |
| env->cc_dest | (env->cc_x << 4);
|
562 |
log_cpu_state(env, 0);
|
563 |
#else
|
564 |
log_cpu_state(env, 0);
|
565 |
#endif
|
566 |
} |
567 |
#endif /* DEBUG_DISAS || CONFIG_DEBUG_EXEC */ |
568 |
spin_lock(&tb_lock); |
569 |
tb = tb_find_fast(env); |
570 |
/* Note: we do it here to avoid a gcc bug on Mac OS X when
|
571 |
doing it in tb_find_slow */
|
572 |
if (tb_invalidated_flag) {
|
573 |
/* as some TB could have been invalidated because
|
574 |
of memory exceptions while generating the code, we
|
575 |
must recompute the hash index here */
|
576 |
next_tb = 0;
|
577 |
tb_invalidated_flag = 0;
|
578 |
} |
579 |
#ifdef CONFIG_DEBUG_EXEC
|
580 |
qemu_log_mask(CPU_LOG_EXEC, "Trace %p [" TARGET_FMT_lx "] %s\n", |
581 |
tb->tc_ptr, tb->pc, |
582 |
lookup_symbol(tb->pc)); |
583 |
#endif
|
584 |
/* see if we can patch the calling TB. When the TB
|
585 |
spans two pages, we cannot safely do a direct
|
586 |
jump. */
|
587 |
if (next_tb != 0 && tb->page_addr[1] == -1) { |
588 |
tb_add_jump((TranslationBlock *)(next_tb & ~3), next_tb & 3, tb); |
589 |
} |
590 |
spin_unlock(&tb_lock); |
591 |
|
592 |
/* cpu_interrupt might be called while translating the
|
593 |
TB, but before it is linked into a potentially
|
594 |
infinite loop and becomes env->current_tb. Avoid
|
595 |
starting execution if there is a pending interrupt. */
|
596 |
env->current_tb = tb; |
597 |
barrier(); |
598 |
if (likely(!env->exit_request)) {
|
599 |
tc_ptr = tb->tc_ptr; |
600 |
/* execute the generated code */
|
601 |
next_tb = tcg_qemu_tb_exec(env, tc_ptr); |
602 |
if ((next_tb & 3) == 2) { |
603 |
/* Instruction counter expired. */
|
604 |
int insns_left;
|
605 |
tb = (TranslationBlock *)(next_tb & ~3);
|
606 |
/* Restore PC. */
|
607 |
cpu_pc_from_tb(env, tb); |
608 |
insns_left = env->icount_decr.u32; |
609 |
if (env->icount_extra && insns_left >= 0) { |
610 |
/* Refill decrementer and continue execution. */
|
611 |
env->icount_extra += insns_left; |
612 |
if (env->icount_extra > 0xffff) { |
613 |
insns_left = 0xffff;
|
614 |
} else {
|
615 |
insns_left = env->icount_extra; |
616 |
} |
617 |
env->icount_extra -= insns_left; |
618 |
env->icount_decr.u16.low = insns_left; |
619 |
} else {
|
620 |
if (insns_left > 0) { |
621 |
/* Execute remaining instructions. */
|
622 |
cpu_exec_nocache(env, insns_left, tb); |
623 |
} |
624 |
env->exception_index = EXCP_INTERRUPT; |
625 |
next_tb = 0;
|
626 |
cpu_loop_exit(env); |
627 |
} |
628 |
} |
629 |
} |
630 |
env->current_tb = NULL;
|
631 |
/* reset soft MMU for next block (it can currently
|
632 |
only be set by a memory fault) */
|
633 |
} /* for(;;) */
|
634 |
} else {
|
635 |
/* Reload env after longjmp - the compiler may have smashed all
|
636 |
* local variables as longjmp is marked 'noreturn'. */
|
637 |
env = cpu_single_env; |
638 |
} |
639 |
} /* for(;;) */
|
640 |
|
641 |
|
642 |
#if defined(TARGET_I386)
|
643 |
/* restore flags in standard format */
|
644 |
env->eflags = env->eflags | cpu_cc_compute_all(env, CC_OP) |
645 |
| (DF & DF_MASK); |
646 |
#elif defined(TARGET_ARM)
|
647 |
/* XXX: Save/restore host fpu exception state?. */
|
648 |
#elif defined(TARGET_UNICORE32)
|
649 |
#elif defined(TARGET_SPARC)
|
650 |
#elif defined(TARGET_PPC)
|
651 |
#elif defined(TARGET_LM32)
|
652 |
#elif defined(TARGET_M68K)
|
653 |
cpu_m68k_flush_flags(env, env->cc_op); |
654 |
env->cc_op = CC_OP_FLAGS; |
655 |
env->sr = (env->sr & 0xffe0)
|
656 |
| env->cc_dest | (env->cc_x << 4);
|
657 |
#elif defined(TARGET_MICROBLAZE)
|
658 |
#elif defined(TARGET_MIPS)
|
659 |
#elif defined(TARGET_OPENRISC)
|
660 |
#elif defined(TARGET_SH4)
|
661 |
#elif defined(TARGET_ALPHA)
|
662 |
#elif defined(TARGET_CRIS)
|
663 |
#elif defined(TARGET_S390X)
|
664 |
#elif defined(TARGET_XTENSA)
|
665 |
/* XXXXX */
|
666 |
#else
|
667 |
#error unsupported target CPU
|
668 |
#endif
|
669 |
|
670 |
/* fail safe : never use cpu_single_env outside cpu_exec() */
|
671 |
cpu_single_env = NULL;
|
672 |
return ret;
|
673 |
} |