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x86: on self-modifying code, generate JIT code until end of block. this fixes issue #266

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This commit is contained in:
Nguyen Anh Quynh 2015-11-16 21:55:42 +08:00
parent 331154551e
commit edaea7020b
3 changed files with 5 additions and 5 deletions
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7
qemu/target-i386/translate.c
View file

@ -8360,6 +8360,8 @@ static inline void gen_intermediate_code_internal(uint8_t *gen_opc_cc_op,
// done with initializing TCG variables
env->uc->init_tcg = true;
pc_ptr = pc_start;
// early check to see if the address of this block is the until address
if (tb->pc == env->uc->addr_end) {
// imitate the HLT instruction
@ -8367,17 +8369,15 @@ static inline void gen_intermediate_code_internal(uint8_t *gen_opc_cc_op,
gen_jmp_im(dc, tb->pc - tb->cs_base);
gen_helper_hlt(tcg_ctx, tcg_ctx->cpu_env, tcg_const_i32(tcg_ctx, 0));
dc->is_jmp = DISAS_TB_JUMP;
pc_ptr = pc_start;
goto done_generating;
}
gen_opc_end = tcg_ctx->gen_opc_buf + OPC_MAX_SIZE;
dc->is_jmp = DISAS_NEXT;
pc_ptr = pc_start;
lj = -1;
max_insns = tb->cflags & CF_COUNT_MASK;
if (max_insns == 0)
if (max_insns <= 1)
max_insns = CF_COUNT_MASK;
// Unicorn: trace this block on request
@ -8460,7 +8460,6 @@ done_generating:
if (!search_pc) {
tb->size = pc_ptr - pc_start;
// tb->icount = num_insns;
}
env->uc->block_full = block_full;

1
qemu/translate-all.c
View file

@ -1202,6 +1202,7 @@ void tb_invalidate_phys_page_range(struct uc_struct *uc, tb_page_addr_t start, t
restore the CPU state */
current_tb_modified = 1;
// self-modifying code will restore state from TB
cpu_restore_state_from_tb(cpu, current_tb, cpu->mem_io_pc);
cpu_get_tb_cpu_state(env, &current_pc, &current_cs_base,
&current_flags);

2
tests/regress/invalid_read_in_cpu_tb_exec.c
View file

@ -27,7 +27,7 @@ int main(int argc, char **argv, char **envp) {
uc_hook hook;
uc_hook_add(uc, &hook, UC_HOOK_BLOCK, hook_block, NULL, (uint64_t)1, (uint64_t)0);
printf("uc_emu_start(…)\n");
uc_emu_start(uc, STARTING_ADDRESS, STARTING_ADDRESS + sizeof(BINARY) - 1, 0, 0);
uc_emu_start(uc, STARTING_ADDRESS, STARTING_ADDRESS + sizeof(BINARY) - 1, 0, 20);
printf("done\n");
return 0;
}