- interrupt_request = cpu->interrupt_request;
- if (unlikely(interrupt_request)) {
- if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
- /* Mask out external interrupts for this step. */
- interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
- }
- if (interrupt_request & CPU_INTERRUPT_DEBUG) {
- cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
- cpu->exception_index = EXCP_DEBUG;
- cpu_loop_exit(cpu);
- }
- if (interrupt_request & CPU_INTERRUPT_HALT) {
- cpu->interrupt_request &= ~CPU_INTERRUPT_HALT;
- cpu->halted = 1;
- cpu->exception_index = EXCP_HLT;
- cpu_loop_exit(cpu);
- }
-#if defined(TARGET_I386)
- if (interrupt_request & CPU_INTERRUPT_INIT) {
- cpu_svm_check_intercept_param(env, SVM_EXIT_INIT, 0);
- do_cpu_init(x86_cpu);
- cpu->exception_index = EXCP_HALTED;
- cpu_loop_exit(cpu);
- }
-#else
- if (interrupt_request & CPU_INTERRUPT_RESET) {
- cpu_reset(cpu);
- }
-#endif
- /* The target hook has 3 exit conditions:
- False when the interrupt isn't processed,
- True when it is, and we should restart on a new TB,
- and via longjmp via cpu_loop_exit. */
- if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
- next_tb = 0;
- }
- /* Don't use the cached interrupt_request value,
- do_interrupt may have updated the EXITTB flag. */
- if (cpu->interrupt_request & CPU_INTERRUPT_EXITTB) {
- cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
- /* ensure that no TB jump will be modified as
- the program flow was changed */
- next_tb = 0;
- }
- }
- if (unlikely(cpu->exit_request)) {
- cpu->exit_request = 0;
- cpu->exception_index = EXCP_INTERRUPT;
- cpu_loop_exit(cpu);
- }
- spin_lock(&tcg_ctx.tb_ctx.tb_lock);
- have_tb_lock = true;
- tb = tb_find_fast(env);
- /* Note: we do it here to avoid a gcc bug on Mac OS X when
- doing it in tb_find_slow */
- if (tcg_ctx.tb_ctx.tb_invalidated_flag) {
- /* as some TB could have been invalidated because
- of memory exceptions while generating the code, we
- must recompute the hash index here */
- next_tb = 0;
- tcg_ctx.tb_ctx.tb_invalidated_flag = 0;
- }
- if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
- qemu_log("Trace %p [" TARGET_FMT_lx "] %s\n",
- tb->tc_ptr, tb->pc, lookup_symbol(tb->pc));
- }
- /* see if we can patch the calling TB. When the TB
- spans two pages, we cannot safely do a direct
- jump. */
- if (next_tb != 0 && tb->page_addr[1] == -1) {
- tb_add_jump((TranslationBlock *)(next_tb & ~TB_EXIT_MASK),
- next_tb & TB_EXIT_MASK, tb);
- }
- have_tb_lock = false;
- spin_unlock(&tcg_ctx.tb_ctx.tb_lock);
-
- /* cpu_interrupt might be called while translating the
- TB, but before it is linked into a potentially
- infinite loop and becomes env->current_tb. Avoid
- starting execution if there is a pending interrupt. */
- cpu->current_tb = tb;
- barrier();
- if (likely(!cpu->exit_request)) {
- trace_exec_tb(tb, tb->pc);
- tc_ptr = tb->tc_ptr;
- /* execute the generated code */
- next_tb = cpu_tb_exec(cpu, tc_ptr);
- switch (next_tb & TB_EXIT_MASK) {
- case TB_EXIT_REQUESTED:
- /* Something asked us to stop executing
- * chained TBs; just continue round the main
- * loop. Whatever requested the exit will also
- * have set something else (eg exit_request or
- * interrupt_request) which we will handle
- * next time around the loop.
- */
- next_tb = 0;
- break;
- case TB_EXIT_ICOUNT_EXPIRED:
- {
- /* Instruction counter expired. */
- int insns_left = cpu->icount_decr.u32;
- if (cpu->icount_extra && insns_left >= 0) {
- /* Refill decrementer and continue execution. */
- cpu->icount_extra += insns_left;
- insns_left = MIN(0xffff, cpu->icount_extra);
- cpu->icount_extra -= insns_left;
- cpu->icount_decr.u16.low = insns_left;
- } else {
- if (insns_left > 0) {
- /* Execute remaining instructions. */
- tb = (TranslationBlock *)(next_tb & ~TB_EXIT_MASK);
- cpu_exec_nocache(env, insns_left, tb);
- align_clocks(&sc, cpu);
- }
- cpu->exception_index = EXCP_INTERRUPT;
- next_tb = 0;
- cpu_loop_exit(cpu);
- }
- break;
- }
- default:
- break;
- }
- }
- cpu->current_tb = NULL;
projects / qemu.git / blobdiff