void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) { #if defined(TARGET_MIPS) || defined(TARGET_SH4) CPUArchState *env = cpu->env_ptr; #endif TranslationBlock *tb; uint32_t n, cflags; target_ulong pc, cs_base; uint32_t flags; tb_lock(); tb = tb_find_pc(retaddr); if (!tb) { cpu_abort(cpu, "cpu_io_recompile: could not find TB for pc=%p", (void *)retaddr); } n = cpu->icount_decr.u16.low + tb->icount; cpu_restore_state_from_tb(cpu, tb, retaddr); /* Calculate how many instructions had been executed before the fault occurred. */ n = n - cpu->icount_decr.u16.low; /* Generate a new TB ending on the I/O insn. */ n++; /* On MIPS and SH, delay slot instructions can only be restarted if they were already the first instruction in the TB. If this is not the first instruction in a TB then re-execute the preceding branch. */ #if defined(TARGET_MIPS) if ((env->hflags & MIPS_HFLAG_BMASK) != 0 && n > 1) { env->active_tc.PC -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4); cpu->icount_decr.u16.low++; env->hflags &= ~MIPS_HFLAG_BMASK; } #elif defined(TARGET_SH4) if ((env->flags & ((DELAY_SLOT | DELAY_SLOT_CONDITIONAL))) != 0 && n > 1) { env->pc -= 2; cpu->icount_decr.u16.low++; env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL); } #endif /* This should never happen. */ if (n > CF_COUNT_MASK) { cpu_abort(cpu, "TB too big during recompile"); } cflags = n | CF_LAST_IO; cflags |= curr_cflags(); pc = tb->pc; cs_base = tb->cs_base; flags = tb->flags; tb_phys_invalidate(tb, -1); if (tb->cflags & CF_NOCACHE) { if (tb->orig_tb) { /* Invalidate original TB if this TB was generated in * cpu_exec_nocache() */ tb_phys_invalidate(tb->orig_tb, -1); } tb_free(tb); } /* FIXME: In theory this could raise an exception. In practice we have already translated the block once so it's probably ok. */ tb_gen_code(cpu, pc, cs_base, flags, cflags); /* TODO: If env->pc != tb->pc (i.e. the faulting instruction was not * the first in the TB) then we end up generating a whole new TB and * repeating the fault, which is horribly inefficient. * Better would be to execute just this insn uncached, or generate a * second new TB. * * cpu_loop_exit_noexc will longjmp back to cpu_exec where the * tb_lock gets reset. */ cpu_loop_exit_noexc(cpu); }
void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) { #if defined(TARGET_MIPS) || defined(TARGET_SH4) CPUArchState *env = cpu->env_ptr; #endif TranslationBlock *tb; uint32_t n, cflags; target_ulong pc, cs_base; uint32_t flags; tb_lock(); tb = tb_find_pc(retaddr); if (!tb) { cpu_abort(cpu, "cpu_io_recompile: could not find TB for pc=%p", (void *)retaddr); } n = cpu->icount_decr.u16.low + tb->icount; cpu_restore_state_from_tb(cpu, tb, retaddr);   n = n - cpu->icount_decr.u16.low;   n++;   #if defined(TARGET_MIPS) if ((env->hflags & MIPS_HFLAG_BMASK) != 0 && n > 1) { env->active_tc.PC -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4); cpu->icount_decr.u16.low++; env->hflags &= ~MIPS_HFLAG_BMASK; } #elif defined(TARGET_SH4) if ((env->flags & ((DELAY_SLOT | DELAY_SLOT_CONDITIONAL))) != 0 && n > 1) { env->pc -= 2; cpu->icount_decr.u16.low++; env->flags &= ~(DELAY_SLOT | DELAY_SLOT_CONDITIONAL); } #endif   if (n > CF_COUNT_MASK) { cpu_abort(cpu, "TB too big during recompile"); } cflags = n | CF_LAST_IO; cflags |= curr_cflags(); pc = tb->pc; cs_base = tb->cs_base; flags = tb->flags; tb_phys_invalidate(tb, -1); if (tb->cflags & CF_NOCACHE) { if (tb->orig_tb) {   tb_phys_invalidate(tb->orig_tb, -1); } tb_free(tb); }   tb_gen_code(cpu, pc, cs_base, flags, cflags);   cpu_loop_exit_noexc(cpu); }