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Fix wrong IP in x86_16 because of cs_base not substracted

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This commit is contained in:
mio 2023-02-20 20:21:56 +01:00
parent 9c9356da6c
commit 133504b504
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GPG Key ID: DFF27E34A47CB873
2 changed files with 33 additions and 2 deletions
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4
qemu/target/i386/translate.c
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@ -4816,7 +4816,7 @@ static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
}
// Sync PC in advance
gen_jmp_im(s, pc_start);
gen_jmp_im(s, pc_start - s->cs_base);
// save the last operand
prev_op = tcg_last_op(tcg_ctx);
@ -9314,7 +9314,7 @@ static void i386_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)
DisasContext *dc = container_of(dcbase, DisasContext, base);
TCGContext *tcg_ctx = dc->uc->tcg_ctx;
dc->prev_pc = dc->base.pc_next;
dc->prev_pc = dc->base.pc_next - dc->cs_base;
tcg_gen_insn_start(tcg_ctx, dc->base.pc_next, dc->cc_op);
}

31
tests/unit/test_x86.c
View File

@ -1229,6 +1229,36 @@ static void test_x86_lazy_mapping(void)
OK(uc_close(uc));
}
static void test_x86_16_incorrect_ip_cb(uc_engine *uc, uint64_t address, uint32_t size, void* data)
{
uint16_t cs, ip;
OK(uc_reg_read(uc, UC_X86_REG_CS, &cs));
OK(uc_reg_read(uc, UC_X86_REG_IP, &ip));
TEST_CHECK(cs == 0x20);
TEST_CHECK(address == ((cs << 4) + ip));
}
static void test_x86_16_incorrect_ip(void)
{
uc_engine *uc;
uc_hook hk1, hk2;
uint16_t cs = 0x20;
char code[] = "\x41"; // INC cx;
uc_common_setup(&uc, UC_ARCH_X86, UC_MODE_16, code, sizeof(code) - 1);
OK(uc_hook_add(uc, &hk1, UC_HOOK_BLOCK, test_x86_16_incorrect_ip_cb, NULL, 1, 0));
OK(uc_hook_add(uc, &hk2, UC_HOOK_CODE, test_x86_16_incorrect_ip_cb, NULL, 1, 0));
OK(uc_reg_write(uc, UC_X86_REG_CS, &cs));
OK(uc_emu_start(uc, code_start, code_start + sizeof(code) - 1, 0, 0));
OK(uc_close(uc));
}
TEST_LIST = {
{"test_x86_in", test_x86_in},
{"test_x86_out", test_x86_out},
@ -1271,4 +1301,5 @@ TEST_LIST = {
{"test_x86_unaligned_access", test_x86_unaligned_access},
#endif
{"test_x86_lazy_mapping", test_x86_lazy_mapping},
{"test_x86_16_incorrect_ip", test_x86_16_incorrect_ip},
{NULL, NULL}};