#include "cpu.h"
#include "trace.h"
#include "disas/disas.h"
+#include "exec/exec-all.h"
#include "tcg.h"
#include "qemu/atomic.h"
#include "sysemu/qtest.h"
}
#endif
-static TranslationBlock *tb_find_physical(CPUState *cpu,
- target_ulong pc,
- target_ulong cs_base,
- uint32_t flags)
+struct tb_desc {
+ target_ulong pc;
+ target_ulong cs_base;
+ CPUArchState *env;
+ tb_page_addr_t phys_page1;
+ uint32_t flags;
+};
+
+static bool tb_cmp(const void *p, const void *d)
{
- CPUArchState *env = (CPUArchState *)cpu->env_ptr;
- TranslationBlock *tb, **tb_hash_head, **ptb1;
- unsigned int h;
- tb_page_addr_t phys_pc, phys_page1;
-
- /* find translated block using physical mappings */
- phys_pc = get_page_addr_code(env, pc);
- phys_page1 = phys_pc & TARGET_PAGE_MASK;
- h = tb_phys_hash_func(phys_pc);
-
- /* Start at head of the hash entry */
- ptb1 = tb_hash_head = &tcg_ctx.tb_ctx.tb_phys_hash[h];
- tb = *ptb1;
-
- while (tb) {
- if (tb->pc == pc &&
- tb->page_addr[0] == phys_page1 &&
- tb->cs_base == cs_base &&
- tb->flags == flags) {
-
- if (tb->page_addr[1] == -1) {
- /* done, we have a match */
- break;
- } else {
- /* check next page if needed */
- target_ulong virt_page2 = (pc & TARGET_PAGE_MASK) +
- TARGET_PAGE_SIZE;
- tb_page_addr_t phys_page2 = get_page_addr_code(env, virt_page2);
-
- if (tb->page_addr[1] == phys_page2) {
- break;
- }
+ const TranslationBlock *tb = p;
+ const struct tb_desc *desc = d;
+
+ if (tb->pc == desc->pc &&
+ tb->page_addr[0] == desc->phys_page1 &&
+ tb->cs_base == desc->cs_base &&
+ tb->flags == desc->flags) {
+ /* check next page if needed */
+ if (tb->page_addr[1] == -1) {
+ return true;
+ } else {
+ tb_page_addr_t phys_page2;
+ target_ulong virt_page2;
+
+ virt_page2 = (desc->pc & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
+ phys_page2 = get_page_addr_code(desc->env, virt_page2);
+ if (tb->page_addr[1] == phys_page2) {
+ return true;
}
}
-
- ptb1 = &tb->phys_hash_next;
- tb = *ptb1;
}
+ return false;
+}
- if (tb) {
- /* Move the TB to the head of the list */
- *ptb1 = tb->phys_hash_next;
- tb->phys_hash_next = *tb_hash_head;
- *tb_hash_head = tb;
- }
- return tb;
+static TranslationBlock *tb_find_physical(CPUState *cpu,
+ target_ulong pc,
+ target_ulong cs_base,
+ uint32_t flags)
+{
+ tb_page_addr_t phys_pc;
+ struct tb_desc desc;
+ uint32_t h;
+
+ desc.env = (CPUArchState *)cpu->env_ptr;
+ desc.cs_base = cs_base;
+ desc.flags = flags;
+ desc.pc = pc;
+ phys_pc = get_page_addr_code(desc.env, pc);
+ desc.phys_page1 = phys_pc & TARGET_PAGE_MASK;
+ h = tb_hash_func(phys_pc, pc, flags);
+ return qht_lookup(&tcg_ctx.tb_ctx.htable, tb_cmp, &desc, h);
}
static TranslationBlock *tb_find_slow(CPUState *cpu,
*last_tb = NULL;
cpu->tb_flushed = false;
}
+#ifndef CONFIG_USER_ONLY
+ /* We don't take care of direct jumps when address mapping changes in
+ * system emulation. So it's not safe to make a direct jump to a TB
+ * spanning two pages because the mapping for the second page can change.
+ */
+ if (tb->page_addr[1] != -1) {
+ *last_tb = NULL;
+ }
+#endif
/* See if we can patch the calling TB. */
if (*last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
tb_add_jump(*last_tb, tb_exit, tb);
if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
*last_tb = NULL;
}
+ /* The target hook may have updated the 'cpu->interrupt_request';
+ * reload the 'interrupt_request' value */
+ interrupt_request = cpu->interrupt_request;
}
- /* Don't use the cached interrupt_request value,
- do_interrupt may have updated the EXITTB flag. */
- if (cpu->interrupt_request & CPU_INTERRUPT_EXITTB) {
+ if (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 */
}
}
+static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb,
+ TranslationBlock **last_tb, int *tb_exit,
+ SyncClocks *sc)
+{
+ uintptr_t ret;
+
+ if (unlikely(cpu->exit_request)) {
+ return;
+ }
+
+ trace_exec_tb(tb, tb->pc);
+ ret = cpu_tb_exec(cpu, tb);
+ *last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK);
+ *tb_exit = ret & TB_EXIT_MASK;
+ switch (*tb_exit) {
+ 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. But we need to
+ * ensure the tcg_exit_req read in generated code
+ * comes before the next read of cpu->exit_request
+ * or cpu->interrupt_request.
+ */
+ smp_rmb();
+ *last_tb = NULL;
+ break;
+ case TB_EXIT_ICOUNT_EXPIRED:
+ {
+ /* Instruction counter expired. */
+#ifdef CONFIG_USER_ONLY
+ abort();
+#else
+ 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. */
+ cpu_exec_nocache(cpu, insns_left, *last_tb, false);
+ align_clocks(sc, cpu);
+ }
+ cpu->exception_index = EXCP_INTERRUPT;
+ *last_tb = NULL;
+ cpu_loop_exit(cpu);
+ }
+ break;
+#endif
+ }
+ default:
+ break;
+ }
+}
+
/* main execution loop */
int cpu_exec(CPUState *cpu)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
-#ifdef TARGET_I386
- X86CPU *x86_cpu = X86_CPU(cpu);
- CPUArchState *env = &x86_cpu->env;
-#endif
int ret;
- TranslationBlock *tb, *last_tb;
- int tb_exit = 0;
SyncClocks sc;
/* replay_interrupt may need current_cpu */
init_delay_params(&sc, cpu);
for(;;) {
+ TranslationBlock *tb, *last_tb;
+ int tb_exit = 0;
+
/* prepare setjmp context for exception handling */
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
/* if an exception is pending, we execute it here */
for(;;) {
cpu_handle_interrupt(cpu, &last_tb);
tb = tb_find_fast(cpu, &last_tb, tb_exit);
- if (likely(!cpu->exit_request)) {
- uintptr_t ret;
- trace_exec_tb(tb, tb->pc);
- /* execute the generated code */
- ret = cpu_tb_exec(cpu, tb);
- last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK);
- tb_exit = ret & TB_EXIT_MASK;
- switch (tb_exit) {
- 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. But we need to
- * ensure the tcg_exit_req read in generated code
- * comes before the next read of cpu->exit_request
- * or cpu->interrupt_request.
- */
- smp_rmb();
- last_tb = NULL;
- break;
- case TB_EXIT_ICOUNT_EXPIRED:
- {
- /* Instruction counter expired. */
-#ifdef CONFIG_USER_ONLY
- abort();
-#else
- 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. */
- cpu_exec_nocache(cpu, insns_left,
- last_tb, false);
- align_clocks(&sc, cpu);
- }
- cpu->exception_index = EXCP_INTERRUPT;
- last_tb = NULL;
- cpu_loop_exit(cpu);
- }
- break;
-#endif
- }
- default:
- break;
- }
- }
+ cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit, &sc);
/* Try to align the host and virtual clocks
if the guest is in advance */
align_clocks(&sc, cpu);
* Newer versions of gcc would complain about this code (-Wclobbered). */
cpu = current_cpu;
cc = CPU_GET_CLASS(cpu);
-#ifdef TARGET_I386
- x86_cpu = X86_CPU(cpu);
- env = &x86_cpu->env;
-#endif
#else /* buggy compiler */
/* Assert that the compiler does not smash local variables. */
g_assert(cpu == current_cpu);
g_assert(cc == CPU_GET_CLASS(cpu));
-#ifdef TARGET_I386
- g_assert(x86_cpu == X86_CPU(cpu));
- g_assert(env == &x86_cpu->env);
-#endif
#endif /* buggy compiler */
cpu->can_do_io = 1;
tb_lock_reset();
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