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Add sign-extended mode for test() instruction

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This commit is contained in:
Maxime Chevalier-Boisvert 2020-12-14 13:26:33 -05:00 • committed by Alan Wu
parent 8ae354e9be
commit 868a6809e7
2 changed files with 24 additions and 11 deletions
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34
ujit_asm.c
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@ -1516,22 +1516,34 @@ void test(codeblock_t* cb, x86opnd_t rm_opnd, x86opnd_t test_opnd)
if (test_opnd.type == OPND_IMM)
{
x86opnd_t imm_opnd = test_opnd;
assert (imm_opnd.as.imm >= 0);
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= 32);
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= rm_opnd.num_bits);
// Use the smallest operand size possible
rm_opnd = resize_opnd(rm_opnd, unsig_imm_size(imm_opnd.as.unsig_imm));
if (rm_opnd.num_bits == 8)
if (imm_opnd.as.imm >= 0)
{
cb_write_rm(cb, false, false, NO_OPND, rm_opnd, 0x00, 1, 0xF6);
cb_write_int(cb, imm_opnd.as.imm, rm_opnd.num_bits);
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= 32);
assert (unsig_imm_size(imm_opnd.as.unsig_imm) <= rm_opnd.num_bits);
// Use the smallest operand size possible
rm_opnd = resize_opnd(rm_opnd, unsig_imm_size(imm_opnd.as.unsig_imm));
if (rm_opnd.num_bits == 8)
{
cb_write_rm(cb, false, false, NO_OPND, rm_opnd, 0x00, 1, 0xF6);
cb_write_int(cb, imm_opnd.as.imm, rm_opnd.num_bits);
}
else
{
cb_write_rm(cb, rm_opnd.num_bits == 16, false, NO_OPND, rm_opnd, 0x00, 1, 0xF7);
cb_write_int(cb, imm_opnd.as.imm, rm_opnd.num_bits);
}
}
else
{
cb_write_rm(cb, rm_opnd.num_bits == 16, false, NO_OPND, rm_opnd, 0x00, 1, 0xF7);
cb_write_int(cb, imm_opnd.as.imm, rm_opnd.num_bits);
// This mode only applies to 64-bit R/M operands with 32-bit signed immediates
assert (imm_opnd.as.imm < 0);
assert (sig_imm_size(imm_opnd.as.imm) <= 32);
assert (rm_opnd.num_bits == 64);
cb_write_rm(cb, false, true, NO_OPND, rm_opnd, 0x00, 1, 0xF7);
cb_write_int(cb, imm_opnd.as.imm, 32);
}
}
else