load_helper only call cpu_loop_exit() when emulation is running
The load_helper is sometimes called from register writes. When the load fails check if emulation is running before jump out of the emulated code.
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1d9c5c7653
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@ -1520,21 +1520,25 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
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mr = find_memory_region(uc, paddr);
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if (mr == NULL) {
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uc->invalid_error = UC_ERR_MAP;
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if (!uc->cpu->stopped) {
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cpu_exit(uc->cpu);
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// XXX(@lazymio): We have to exit early so that the target register won't be overwritten
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// because qemu might generate tcg code like:
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// qemu_ld_i64 x0,x1,leq,8 sync: 0 dead: 0 1
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// where we don't have a change to recover x0 value
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cpu_loop_exit(uc->cpu);
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}
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return 0;
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}
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} else {
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uc->invalid_addr = paddr;
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uc->invalid_error = error_code;
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// printf("***** Invalid fetch (unmapped memory) at " TARGET_FMT_lx "\n", addr);
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if (!uc->cpu->stopped) {
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cpu_exit(uc->cpu);
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// See comments above
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cpu_loop_exit(uc->cpu);
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}
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return 0;
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}
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}
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@ -1588,9 +1592,11 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
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uc->invalid_addr = paddr;
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uc->invalid_error = UC_ERR_READ_PROT;
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// printf("***** Invalid memory read (non-readable) at " TARGET_FMT_lx "\n", addr);
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if (!uc->cpu->stopped) {
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cpu_exit(uc->cpu);
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// See comments above
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cpu_loop_exit(uc->cpu);
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}
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return 0;
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}
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}
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@ -1618,9 +1624,11 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
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uc->invalid_addr = paddr;
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uc->invalid_error = UC_ERR_FETCH_PROT;
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// printf("***** Invalid fetch (non-executable) at " TARGET_FMT_lx "\n", addr);
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if (!uc->cpu->stopped) {
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cpu_exit(uc->cpu);
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// See comments above
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cpu_loop_exit(uc->cpu);
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}
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return 0;
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}
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}
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@ -1415,6 +1415,17 @@ static void test_x86_vtlb(void)
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OK(uc_close(uc));
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}
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static void test_x86_segmentation()
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{
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uc_engine *uc;
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uint64_t fs = 0x53;
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uc_x86_mmr gdtr = { 0, 0xfffff8076d962000, 0x57, 0 };
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OK(uc_open(UC_ARCH_X86, UC_MODE_64, &uc));
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OK(uc_reg_write(uc, UC_X86_REG_GDTR, &gdtr));
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uc_assert_err(UC_ERR_EXCEPTION, uc_reg_write(uc, UC_X86_REG_FS, &fs));
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}
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TEST_LIST = {
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{"test_x86_in", test_x86_in},
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@ -1461,4 +1472,5 @@ TEST_LIST = {
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{"test_x86_16_incorrect_ip", test_x86_16_incorrect_ip},
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{"test_x86_mmu", test_x86_mmu},
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{"test_x86_vtlb", test_x86_vtlb},
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{"test_x86_segmentation", test_x86_segmentation},
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{NULL, NULL}};
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